DESC:TECHNICAL FIELD
The present subject matter is related to field of power electronics, more particularly, relates to power conversion system and method for enhanced and efficient utilization of power from a renewable power generation unit. The present subject matter relates to power conversion system for supplying electric power in which there are at least two power sources, and at least one renewable source.

BACKGROUND
An electrical system may be an interconnected network comprising one or more components. Each of the one or more components may be at least one of power sources and power consumers. The one or more components may include at least one of grid, one or more power electronic converters, one or more inverters, one or more load, one or more power sources, Uninterruptable Power Supply (UPS) and so on. Figures 1a and 1b illustrate exemplary electrical systems. In Figure 1a, the electrical system comprises the utility grid 101, UPS 102, a first load 103.1 and a second load 103.2 (together, may also be referred as one or more loads 103), a Grid-Tie Solar Inverter (GTSI) 104 and a Photovoltaic Panel (PV) 105. The utility grid 101 may be configured to supply power to the UPS 102 and the second load 103.2 directly. Consider the first load 103.1 may be a critical load which requires power even after outage of the utility grid 101 occurs. Hence, the UPS 102 may be configured to supply power to the first load 103.1 (may also be referred to the critical load 103.1) during the outage. The UPS 102 comprises a battery bank (not shown in the figure) which may be charged using power from the utility grid 101.Further, power from the battery bank may be used to power the critical load 103.1, during the outage of the gird 101. Hence, the power from the UPS 102 may be utilized as back-up power to the critical load 103.1,during the outage of the utility grid 101. The utility grid 101 may be supplied with power from another source, which may be a renewable source. It may be essential for the GTSI 104to access energy from the PV panel 105 which is a renewable solar energy. The PV panel 105 is a Direct Current (DC) source, and DC power from the PV panel 105 is fed to the utility grid 101which is an Alternating Current (AC) source. The GTSI 104 may be configured to act as a DC-AC converter for supplying the power to the utility grid 101. In the electrical system as illustrated in Figure 1a and embodiments of such electrical systems, in case of an outage of the utility grid 101, the UPS 102 starts feeding power to the critical loads103.1, while the GTSI104 ceases operation and remains idle. This is due to the fact that the GTSI 104 by design does not operate in the absence of the utility grid 101. No power is extracted from PV panel 105 by the GTSI104 i.e., the power from the PV panel 105 stays unutilized during the outage of the utility grid 101. This condition prevails until power from the utility grid 101 is back, after which the GTSI 104 synchronizes with the utility grid 101 and resumes operation.

Figure 1billustrates an alternative electrical system comprising a Dual-Mode Solar Inverter (DMSI)106. The alternative electrical system shown in Figure 1b, consists of the DMSI 106 along with the PV panel 105, the utility grid 101, the critical loads 103.1 and the non-critical loads 103.2. The DMSI 106 may be a power electronic converter that simultaneously interacts with the utility grid 101 and the PV panel 105.Further the DMSI 106 delivers power to the critical load 103.1, as shown in Figure 1b. The DMSI 106 may be capable of accessing solar energy from the PV panel 105, even during an outage of the utility grid 101.Such a scheme to access the solar energy is based on an integrated design approach wherein the functionalities of the conventional GTSI 104 and UPS 105 are incorporated into a single electrical circuit. Also the DMSI 106 may perform functionalities of both the GTSI 104 and the UPS 105 in a unified manner. In such an electrical system, part of the DMSI106 that interacts with the PV panel 105 works as a DC to DC converter, irrespective of availability of the utility grid 101.However, approach of integrating the grid-tie inverter and the UPS may include one or more limitations in designing of the DMSI106. The one or more limitations may include the DMSI106 to be not economic, below a predefined power level. As a result, availability of power ratings of the DMSI 106 to a user may be limited. Also, in scenarios where capacity of the PV panel 105 is enhanced, there may be need for scaling up power ratings associated with the DMSI 106 as well. The scaling-up process of an installed DMSI system is complex and can prove expensive for the consumer due to its integrated nature. Also, since the GTSI and the UPS are coupled in the DMSI 106, there may be a restriction for type of the UPS implemented in the DMSI 106. Also, upgrading a facility with an already existing UPS 102 based backup system with PV panel 105 is not feasible.

SUMMARY
In an embodiment, the present disclosure relates to a power conversion system for utilizing renewable power from a renewable power generation unit in an environment. The power conversion system comprises a power control unit and a switch unit. The power control unit is coupled with the power generation unit. The power control unit detects at-least one grid associated with the environment to be one of available and unavailable. The at-least one grid is connected to one or more critical loads via an Uninterrupted Power Supply (UPS), and one or more non-critical loads in the environment. Further, the power control unit converts the power to Alternate Current (AC) power, when the at-least one grid is detected to be available. Upon conversion of the power, the switch unit establishes connection between the power control unit and the at-least one grid. Further, the power control unit converts the power to a modified Direct Current (DC) power when the at-least one grid is detected to be unavailable. Upon conversion of the power, the switch unit establishes connection between the power control unit and the UPS via battery.

In an embodiment, the present disclosure relates to a method for utilizing power generated by the power generation unit in an environment. Initially, the method includes detecting at-least one grid associated with the environment to be one of available and unavailable. Upon detecting the at-least one grid to be available, the power conversion system converts the power to AC power and establishes connection between the power control unit and the at-least one grid. Upon detecting the at-least one grid to be unavailable, the power conversion system converts the power to modified DC power and establishes connection between the power control unit and the UPS via the battery.

The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate exemplary embodiments and, together with the description, serve to explain the disclosed principles. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system and/or methods in accordance with embodiments of the present subject matter are now described, by way of example only, and regarding the accompanying figures, in which:

Figure 1a and 1bshow embodiments of a conventional electrical system;

Figure 2 shows an exemplary environment with a power conversion system for utilizing power, when at-least one grid is detected to be available, in accordance with some embodiments of the present disclosure;

Figure 3 shows an exemplary environment with a power conversion system for utilizing power, when at-least one grid is detected to be unavailable, in accordance with some embodiments of the present disclosure;

Figure 4 illustrates a flowchart showing an exemplary method of utilizing power in an environment with a power conversion system, in accordance with some embodiments of present disclosure;

Figures 5a-5c shows plots illustrating experimental results of operation of a power conversion system, in accordance with embodiments of the present disclosure.

It should be appreciated by those skilled in the art that any block diagrams herein represent conceptual views of illustrative systems embodying the principles of the present subject matter. Similarly, it will be appreciated that any flow charts, flow diagrams, state transition diagrams, pseudo code, and the like represent various processes which may be substantially represented in computer readable medium and executed by a computer or processor, whether such computer or processor is explicitly shown.

DETAILED DESCRIPTION
In the present document, the word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment or implementation of the present subject matter described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

While the disclosure is susceptible to various modifications and alternative forms, specific embodiment thereof has been shown by way of example in the drawings and will be described in detail below. It should be understood, however that it is not intended to limit the disclosure to the forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the spirit and the scope of the disclosure.

The terms “comprises”, “comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, device or method that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device or method. In other words, one or more elements in a system or apparatus proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or method.

The terms “includes”, “including”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, device or method that includes a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device or method. In other words, one or more elements in a system or apparatus proceeded by “includes… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or method.

In the following detailed description of the embodiments of the disclosure, reference is made to the accompanying drawings that form a part hereof, and in which are shown by way of illustration specific embodiments in which the disclosure may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the disclosure, and it is to be understood that other embodiments may be utilized and that changes may be made without departing from the scope of the present disclosure. The following description is, therefore, not to be taken in a limiting sense.

Present disclosure proposes a power conversion system for utilizing power from a power generation unit in an environment. The power conversion system comprises a power control unit and a switch unit. The power control unit is coupled with the power generation unit present in the environment. Initially, the power control unit detects at-least one grid associated with the environment to be one of available and unavailable. Also, the power control unit may receive power from the renewable power generation unit. Also, the renewable power generation unit may be such as PV panel. The PV panel may be configured to generated PV based Direct Current (DC) power. The at-least one grid present in the environment is connected to one or more critical loads via an Uninterrupted Power Supply (UPS), and one or more non-critical loads in the environment. Further, the power control unit checks if at-least one grid is available. Further, when the at-least one grid is available the power control unit converts the power to Alternate Current (AC) power. Upon conversion of the power, the switch unit establishes connection between the power control unit and at-least one grid to supply power to one or more critical loads and one or more non-critical loads. Further, if the at-least one grid is detected to be unavailable, the power control unit converts the power to a modified Direct Current (DC) power. Upon conversion of the power, the switch unit establishes connection between the power control unit and the UPS via the battery to supply power to the one or more critical loads. Hence, the power control unit of the present disclosure enhances flexibility and allows a user to choose a power generation unit without restrictions posed by power ratings of the UPS already available at the facility.

Figures 2 and 3 shows an exemplary environment200 with power conversion system 208 for utilizing power, in accordance with embodiments of the present disclosure. The environment 200 comprises one or more components which include, but are not limited to, a power generation unit 201, a power conversion system 208 configured with a power control unit 202, and a switch unit 203, at-least one grid 204, a UPS 205, one or more critical loads 206, and one or more non-critical loads 207. The power generation unit 201 may be configured to generate power. In an embodiment, the power generation unit 201 may be a renewable source which includes, but is not limited to, a photovoltaic panel, wind turbine, a hydro-electric system and so on. The power generation unit may also be refereed as renewable power generation unit. In an embodiment, the power generation unit 201 may be configured to generate one of DC power. For example, consider the power generation unit 201 may be the photovoltaic panel configured to convert solar energy to electrical energy to generate the PV based DC power. In an embodiment, the power generation unit 201 may be any power source configured to supply power to one of the at-least one grid 204 and UPS 205.The at-least one grid 204 may be configured to generate, transmit and distribute power. In an embodiment, the at-least one grid 204 is said to be one of available and unavailable. In an embodiment, the at-least one grid 204 is said to be available during normal functioning of the at-least one grid. i.e. when the grid 204 is supplying power to the power conversion system 208. In an embodiment, the at-least one grid 204 is said to be unavailable during outage of the at-least one grid 204. The outage of the at-least one grid 204 is a condition where the at-least one grid 204 may be not able to supply power to the power conversion system 208. The outage of the at-least one grid 204 may be due to one or more reasons, which include, but is not limited to, faults at power stations in the at-least one grid 204, damage to electric transmission lines, substations or other parts of distribution system, short circuit, overloading of electricity mains and so on.
The power control unit 202 may be configured to control supply of the power received from the power generation unit 201. In an embodiment, the power control unit 202 may be configured to detect the at-least one grid 204 to be one of available and unavailable. One or more techniques, known to a person skilled in the art, may be implemented for the detection. In an embodiment, the power control unit 202 may be configured to operate in a gird-tie mode when the at-least one grid 204 is detected to be available. In an embodiment, the power control unit 202 may be configured to operate in a battery emulation mode when the at-least one grid 204 is detected to be unavailable. In an embodiment, the power control unit 202 may be configured to convert power received from power generation unit 201 to AC power when operating in the grid-tie mode. In an embodiment, the power control unit 202 may be configured to convert power received from power generation unit 201 to DC power when operating in the battery emulation mode in tandem with the UPS 205 via the battery. Further, the switch unit 203 may be configured to supply power received from the power control unit 202 to the one or more critical loads 206 and the one or more non-critical loads 207 based on the detection. The one or more critical loads 206 may be one or more loads which may be required to be supplied with power during the outage of the at-least one grid 204. The one or more non-critical loads 207 may not be required to be powered during the outage of the at-least one grid 204. In an embodiment, the one or more non-critical loads 207 may include, but are not limited to, fans, heaters and refrigerators. In an embodiment, the one or more critical loads 206 may include, but are not limited to lights in critical areas, computer systems and data-servers. In an embodiment, the switch unit 203 establishes connection between power control unit 202 and the at-least one grid 204 to supply power to the one or more critical loads 206 via the UPS 205 and the one or more non-critical loads 207 when the at-least one grid 204 is detected to be available. In an embodiment, the switch unit 203 establishes connection between power control unit 202 and the UPS 205 to supply power to the one or more critical loads 206 via the UPS 205 the battery when the at-least one grid 204 is detected to be unavailable. In an embodiment, the switch unit 203 may be a transit switch and any switch that is known to a person skilled in the art. The UPS 205 may be an electrical apparatus configured to provide back-up power in the power conversion system 208 when the at-least one grid 204 is detected to be unavailable. In an embodiment, the UPS 205 may comprise at least one of a battery bank, a rectifier, an inverter and so on which may be configured to store the power and supply to the one or more critical loads 206 when desired.

Figure 2 shows an exemplary environment 200with the power conversion system 208for utilizing power, when the at-least one grid 204 is detected to be available, in accordance with some embodiments of the present disclosure. The at-least one grid 204 when detected to be available, the power control unit 202 may be configured to convert power received from power generation unit 201 to AC power and the switch unit 203 may be configured to establish connection between the power control unit 202 and one of the at-least one grid 204 to supply the power to the one or more critical loads 206 via the UPS 205, and the one or more non-critical loads 207. In an embodiment, the battery in the UPS 205 may be charged by the UPS 205 using the power received from the at-least one grid 204.

Figure 3 shows an exemplary environment 200 with the power conversion system 208for utilizing power, when at-least one grid 204 is detected to be unavailable, in accordance with some embodiments of the present disclosure. In Figure 3, the power generated from the power generation unit 201 may be fed to the power control unit 202. The power control unit 202 may be configured to convert the power received from the power generation unit 201 to DC power when the at-least one grid 204 is detected to be unavailable. Further, the switch unit 203 establishes connection between the power control unit 202 and the one more critical loads 206 via the UPS 205 battery. The DC power from the power control unit 202 may be utilized to charge the battery in the UPS 205. In an embodiment, the DC power drawn by the UPS 205 may be monitored and utilized for functioning of the one or more critical loads 206.

Further, in an embodiment, the power control unit 202 may be operated in one or more sub-modes, when the at-least one grid 204 is detected to be unavailable. In an embodiment, the one or more sub-modes of operation may be achieved by appropriate closed-loop digital control of the power control unit 202. In an embodiment, a closed-loop control structure may be implemented in the power control unit 202 to determine power requirement of the one or more critical loads 206. Further, supplying pre-defined amount of the DC power to the UPS 205 based on the power requirement of the one or more critical loads 206. In an embodiment, the power control unit 202 may be configured to deliver maximum possible power from the power generation unit 201, to the battery of UPS 205 when there is power requirement greater than the pre-defined threshold value. In an embodiment, the power control unit 202 may said to be operated in Maximum Power Point Tracker (MPPT) mode when the maximum power is supplied by the power control unit 202.

In an embodiment, the power control unit 202 may be configured to restrict supply of power to the UPS 205 when the power requirement is less than the pre-defined threshold value. In an embodiment, the power control unit 202 may be said to be operated in charger mode, when the restricted amount of power is supplied by the power control unit 202. For example, consider the one or more critical loads 206 to be plurality of computers. When one or more computers, from the plurality of computers, are switched-off, the demand of the one or more critical loads 206 is lesser. In this case, the power control unit 202 may be configured to restrict the power pumped in to the battery bank of the UPS 205 to appropriate levels, such that the charging current through the battery bank is within safe levels. This is enabled by changing operating mode of the power control unit 202 to the charger mode.

In an embodiment, the power control unit 202 may be configured to be controlled to emulate an additional battery bank, which may be virtual in nature. The virtual battery emulation behaviour is a performance characteristic achieved on the power conversion system 208, using a suitable control technique that makes the power generation unit (201) function as a virtual battery in parallel with the physical battery of the UPS 205. The power control unit 202will be functioning in this mode when battery management needs to be performed by the power utilization system 208, when MPPT is not being performed. Such a virtual battery effect prevents overcharging the UPS 205 battery. The virtual battery bank emulates an additional battery string connected in parallel with the battery bank of the UPS 205, such that the power control unit 202 shares the power demanded by the UPS 205 from the battery. For example, when the one or more critical loads 206 draws power from the UPS 205, DC current from the battery bank is now shared between the battery of the UPS 205 and the virtual battery-bank is emulated by the control unit 202. This may be achieved by appropriately controlling the power control unit 202. Hence, drain of the battery bank, which is a physical battery, is reduced in the auxiliary battery mode. By this, time for which the battery bank can serve the one or more critical loads 206 may be extended. Also, by the auxiliary battery mode of operation, cycle-life of the battery bank of the UPS 205 may be extended. Figure 4 illustrates a flowchart showing an exemplary method of utilizing power in an environment 200 with a power conversion system 208, in accordance with some embodiments of present disclosure;

At block 401, the power conversion system 208detects the at-least one grid 204 associated with the environment to be one of available and unavailable.

At block 402, the power conversion system 208 checks if at-least one grid 204 is detected to be available. Step in block 403A and 404A is performed when the at-least one grid is detected to be available. Step in block 403B and 404B is performed when the at-least one grid is detected to be unavailable.
At block 403A, the power conversion system 208 converts power received from the power generation unit 201 to AC power when the at-least one grid 204 is detected to be available.
At block 403B, the power conversion system 208 converts power received from the power generation unit 201 to DC power when the at-least one grid 204 is detected to be unavailable.
At block 404A, upon conversion of power to AC power, the power conversion system 208establishes connection between the power control unit 202 and the at-least one grid 204, when the at-least one grid 204 is detected to be available.

At block 404B, upon conversion of power to DC power, the power conversion system 208establishes connection between the power control unit 202 and the UPS 205, when the at-least one grid 204 is detected to be unavailable.

Figures 5a-5c shows plots illustrating experimental results of operation of the power conversion system 208, in accordance with embodiments of the present disclosure.

Figure 5a illustrates experimental results of the power control unit 202 when the at-least one grid 204 is detected to be unavailable, showing 1.6 kilo Watt (Kw) step in active power command. Root Mean Square (RMS) value of grid voltage (Vgrid) is 230 Volts (V) and DC bus in the power control unit 202 is powered directly by the power generation unit 201 at 475V. A 1.6kW step change of real power command is shown above in Figure 5a, which corresponds to 7 Ampere (A) RMS of injected grid current (Igrid). It may be seen that the at-least one grid current smoothly responds to the applied change in the grid voltage. Operating power factor of the power control unit 202 is 0.99.

Figure 5b illustrates DC to DC converter i.e., when the power control unit 202 detects the at-least one grid 204 to be unavailable. The graphical results show mode transition of battery bank of the UPS205 from discharging state to charging state. In the experiment, the battery bank of 36V, 60AH may be used and the DC bus voltage may be powered directly by the power generation unit 201 at 120V. A charger mode control structure comprises of outer voltage loop and inner current loop, with current limit set at 6 A (C/10 rating of the battery bank) that enables constant battery current (Ibatt). The battery bank is already catering to a load of 3A. Hence, when the power control unit 202 is enabled to operate in the control mode, the battery bank starts charging with a current of 3 A (C/20 value). The power delivered by the power control unit 202 is about 216 W.

Figure 5c illustrates response of the power generation unit 201 which forms the DC bus, after the power control unit 202 starts delivering power to the battery bank of the UPS 205. It may be noted that when charging starts delivering 216W of power (while remaining in current limit), the power generation unit 201 dips from its open-circuit value. The power rating of the power generation unit 201in this instance is 300W peak.

Advantages:

Embodiments of the present disclosure disclose to provision a power control unit which is independent of UPS. The power control unit is configured to be compatible with any type of the UPS that may be available in the facility. Hence, proposed power control unit enhances flexibility and allows a user to choose a power generation unit without restrictions posed by power ratings of the UPS already available at the facility. By this, cost of the electrical system may also be reduced significantly.

Embodiments of the present disclosure disclose to emulate a virtual battery bank in a UPS using the power control unit. The emulation is achieved without the need for any communication of signals or data between the power generation unit and the UPS.
Embodiments of the present disclosure disclose to provision an economic alternative for catering to back-up power needs in comparison to conventional approaches.

Embodiments of the present disclosure disclose to provision a method to retrofit the power control unit and thus upgrade an already installed or existing UPS backup power system with solar PV capability. This enhances renewable energy access during grid outage.

Embodiments of the present disclosure disclose one or more modes of operation associated with the power control unit 202 and changeover to any of the one or more modes of operation may be achieved without restriction or modification in the existing UPS.
Embodiments of the present disclosure disclose to ensure that a power generation unit is harnessed even during outage of a grid, by supporting a UPS, and this caters to extend the back-up power capability of overall electrical system.

The terms "an embodiment", "embodiment", "embodiments", "the embodiment", "the embodiments", "one or more embodiments", "some embodiments", and "one embodiment" mean "one or more (but not all) embodiments of the invention(s)" unless expressly specified otherwise.
The terms "including", "comprising", “having” and variations thereof mean "including but not limited to", unless expressly specified otherwise. The enumerated listing of items does not imply that any or all of the items are mutually exclusive, unless expressly specified otherwise. The terms "a", "an" and "the" mean "one or more", unless expressly specified otherwise.

A description of an embodiment with several components in communication with each other does not imply that all such components are required. On the contrary a variety of optional components are described to illustrate the wide variety of possible embodiments of the invention.

When a single device or article is described herein, it will be readily apparent that more than one device/article (whether or not they cooperate) may be used in place of a single device/article. Similarly, where more than one device or article is described herein (whether or not they cooperate), it will be readily apparent that a single device/article may be used in place of the more than one device or article or a different number of devices/articles may be used instead of the shown number of devices or programs. The functionality and/or the features of a device may be alternatively embodied by one or more other devices which are not explicitly described as having such functionality/features. Thus, other embodiments of the invention need not include the device itself.

Finally, the language used in the specification has been principally selected for readability and instructional purposes, and it may not have been selected to delineate or circumscribe the inventive subject matter. It is therefore intended that the scope of the invention be limited not by this description.

REFERRAL NUMERALS:

Reference number Description
101 Utility grid
102 UPS
103.1 Critical loads
103.2 Non-critical loads
104 Grid-tie solar inverter
105 Photovoltaic panel
106 Dual-mode solar inverter
200 Environment
201 Power generation unit
202 Power control unit
203 Switch unit
204 At-least one grid
205 UPS
206 One or more critical loads
207 One or more non-critical loads
208 Power Conversion system
,CLAIMS:We claim:

1. A power conversion system (208) for utilizing power from a power generation unit (201) in an environment (200), wherein the power conversion system (208) comprises:
a power control unit (202) coupled with the power generation unit (201), wherein the power control unit (202) is configured to:
detect at-least one grid (204) associated with the environment to be one of available and unavailable, wherein said at-least one grid (204) is connected to one or more critical loads (206) via an Uninterrupted Power Supply (UPS) (205), and one or more non-critical loads (207), in the environment;
convert the power to Alternate Current (AC) power when the at-least one grid (204) is detected to be available; and
convert the power to Direct Current (DC) power when the at-least one grid (204) is detected to be unavailable; and
a switch unit (203) to establish connection between the power control unit (202) and one of the at-least one grid (204) and the UPS (205), based on the detection, wherein the switch unit (203) is configured to:
establish connection between the power control unit (202) and the at-least one the grid, when the at-least one grid (204) is detected to be available; and
establish connection between the power control unit (202) and the UPS (205), when the at-least one grid (204) is detected to be unavailable.

2. The power conversion system (208) as claimed in claim 1, wherein the power generation unit (201) is one of a renewable power source and non-renewable power source.

3. The power conversion system (208) as claimed in claim 1, wherein the one or more critical loads (206) require power supply when the at-least one grid (204) is detected to be unavailable.

4. The power conversion system (208) as claimed in claim 1, wherein, when the at-least one grid (204) is detected to be unavailable, the power control unit (202) is further configured to:
determine power requirement of the one or more critical loads (206); and
supply predefined amount of the DC power to the UPS (205) based on the power requirement.

5. The power conversion system (208) as claimed in claim 1, wherein, when the at-least one grid (204) is detected to be unavailable, the power control unit (202) is further configured to emulate a virtual battery connected parallel with the UPS (205) for providing additional power to the one or more critical loads (206).

6. A method for utilizing power generated by a power generation unit (201) in an environment, wherein the method comprises:
detecting, by a power conversion system (208), at-least one grid (204) associated with the environment to be one of available and unavailable, wherein said at-least one grid (204) is connected to one or more critical loads (206) via an Uninterrupted Power Supply (UPS) (205), and one or more non-critical loads (207), in the environment;
converting, by the power conversion system (208), the power to Alternate Current (AC) power when the at-least one grid (204) is detected to be available; and
converting, by the power conversion system (208), the power to Direct Current (DC) power when the at-least one grid (204) is detected to be unavailable; and
establishing, by the power conversion system (208), connection between the power control unit (202) and one of the at-least one grid (204) and the UPS (205), based on the detection, wherein connection between the power control unit (202) and the at-least one grid (204) is established when the at-least one grid (204) is detected to be available, wherein connection between the power control unit (202) and the UPS (205) is established when the at-least one grid (204) is detected to be unavailable.

7. The method as claimed in claim 6, wherein the power generation unit (201) is one of a renewable power source and non-renewable power source.

8. The method as claimed in claim 6, wherein the one or more critical loads (206) require power supply when the at-least one grid (204) is detected to be unavailable.

9. The method as claimed in claim 6, wherein, when the at-least one grid (204) is detected to be unavailable, the method further comprises:
determining, by the power conversion system (208), power requirement of the one or more critical loads (206); and
supplying, by the power conversion system (208), predefined amount of the DC power to the UPS (205) based on the power requirement maximum.

10. The method as claimed in claim 6, wherein, when the at-least one grid (204) is detected to be unavailable, the method further comprises emulating a virtual battery connected parallel with the UPS (205) for providing additional power to the one or more critical loads (206).

Dated this 23rd Day of November 2018

R. RAMYA RAO
IN/PA-1607
OF K & S PARTNERS
AGENT FOR THE APPLICANT