Claims:1. A system for speed and operation control of a power photovoltaic (PV) pump, the system comprising:
a set of solar/PV panels that converts solar energy into electrical energy and supply the electrical energy to a single stage converter;
a controller/digital signal processor (DSP) unit that is configured to take feedback of PV voltage (VPV) and PV current (IPV) from the PV panel wherein PV power (PPV) is calculated from ADC values of the VPV and IPV; and
a three phase grid power supply unit that is configured as backup power supply.
2. The system as claimed in claim 1, wherein said single stage converter directly converts the PV power from DC form to AC form through an inverter configured to a semiconductor module of the single stage converter.
3. The system as claimed in claim 1, wherein calculated PPV direction along with the VPV and IPV direction is continuously monitored and frequency command to a motor configured thereon is varied in order to operate the PV panel at maximum power.
4. The system as claimed in claim 1, wherein maximum power point technique (MPPT) is used to calculate PPV from the ADC values of VPV and IPV.
5. The system as claimed in claim 1, wherein said system is further configured with a failsafe algorithm with integrated pump protection.
6. A method for speed and operation control of a power photovoltaic (PV) pump, the method comprises the steps of:
checking whether the system is to be started with grid mode or PV mode and corresponding commands are automatically provided to the system; and
once the system is started with PV mode, checking if PV voltage of the input supply is greater than a pre-defined minimum threshold PV voltage value;
7. The method of claim 6, wherein the method further comprises the steps of sampling VPV, IPV and calculating PPV values and setting sampling time variable based on the system.
8. The method of claim 6, wherein the method further comprises the steps of observing direction if VPV, IPV and PPV and changing frequency output accordingly.
9. The method of claim 8, wherein changing of frequency output is configured such that the frequency output is increased if power direction is positive and frequency output is decreased if power direction is negative.
10. The method of claim 6, wherein the method further comprises the step of checking if solar irradiation increases or decreases.
, Description:TECHNICAL FIELD
[0001] The present disclosure relates generally to water pumping systems for irrigation/domestic purposes. In particular, the present invention relates to a system and method for systematic operation of an alternating power photovoltaic pumping system.

BACKGROUND
[0002] Photovoltaic modules or solar panels are widely used for generating electrical power. To this end, electrical power from the photovoltaic panels can be consumed directly, stored in a battery or fed to an electrical grid. When the energy is consumed directly, the load may be for example a motor for a specific purpose, such as pumping. In such a case the motor rotates the pump if power is available from the photovoltaic panel system.
[0003] Existing pumping systems use two stage converters for powering photovoltaic (PV) pumps wherein PV power is boosted from a lower DC voltage to a higher DC voltage and thereafter the DC voltage is inverted to provide power to water pumps which accounts for further power loss, increased cost and deteriorating efficiency. Additionally, backup in case of outage or maintenance of solar panels is not provided in such systems.
[0004] Thus there is a need of a systematic arrangement and methodology that provides a PV pumping system with enhanced system efficiency and further provides an integrated backup power supply.

OBJECTS OF THE INVENTION
[0005] A general object of the present disclosure is to provide a system and method for systematic operation of an alternating power photovoltaic pumping system.
[0006] Another object of the present disclosure is to provide a system and method for an alternating power photovoltaic pumping system that incorporates single stage power conversion.
[0007] Another object of the present disclosure is to provide a system and method for an alternating power photovoltaic pumping system that incorporates less power loss compared to two stage pumps.
[0008] Another object of the present disclosure is to provide a system and method for an alternating power photovoltaic pumping system that provides a fail safe algorithm with integrated pump protection.
[0009] Another object of the present disclosure is to provide a system and method for an alternating power photovoltaic pumping system that provides power back up in case of lack of solar energy.
[0010] Another object of the present disclosure is to provide a system and method for an alternating power photovoltaic pumping system that is cost efficient.

SUMMARY
[0011] The present disclosure relates generally to water pumping systems for irrigation/domestic purposes. In particular, the present invention relates to a system and method for systematic operation of an alternating power photovoltaic pumping system.
[0012] In an aspect, the present disclosure discloses a system for speed and operation control of a power photovoltaic (PV) pump wherein the system consists of a set of solar/PV panels that converts solar energy into electrical energy and supply the electrical energy to a single stage converter, a controller/digital signal processor (DSP) unit that is configured to take feedback of PV voltage (VPV) and PV current (IPV) from the PV panel wherein PV power (PPV) is calculated from ADC values of the VPV and IPV, and a three phase grid power supply unit that is configured as backup power supply.
[0013] In an embodiment, said single stage converter directly converts the PV power from DC form to AC form through an inverter configured to a semiconductor module of the single stage converter.
[0014] In an embodiment, the calculated PPV direction along with the VPV and IPV direction is continuously monitored and frequency command to a motor configured thereon is varied in order to operate the PV panel at maximum power.
[0015] In an embodiment, maximum power point technique (MPPT) is used to calculate PPV from the ADC values of VPV and IPV.
[0016] In an aspect, said system is further configured with a failsafe algorithm with integrated pump protection.
[0017] In an aspect, the present disclosure discloses a method for speed and operation control of a power photovoltaic (PV) pump wherein the method consists of the steps of:
checking whether the system is to be started with grid mode or PV mode and corresponding commands are automatically provided to the system;
once the system is started with PV mode, checking if PV voltage of the input supply is greater than a pre-defined minimum threshold PV voltage value; and
[0018] In an aspect, the method further consists of the steps of sampling VPV, IPV and calculating PPV values and setting sampling time variable based on the system.
[0019] In an aspect, the method further consists of the steps of observing direction if VPV, IPV and PPV and changing frequency output accordingly.
[0020] In an embodiment, changing of frequency output is configured such that the frequency output is increased if power direction is positive and frequency output is decreased if power direction is negative.
[0021] In an aspect, the method further consists of the step of checking if solar irradiation increases or decreases.

BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.
[0023] Fig. 1 illustrates an exemplary representation of architecture for systematic operation of alternate power solar pump in accordance with embodiments of the present disclosure.
[0024] Fig. 2 illustrates an exemplary flowchart methodology for the operation of PV powered alternate pumping system in accordance with embodiments of the present disclosure.

DETAILED DESCRIPTION
[0025] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such details as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0026] Embodiments explained herein relate generally to water pumping systems for irrigation/domestic purposes. In particular, the present invention relates to a system and method for systematic operation of an alternating power photovoltaic pumping system.
[0027] The present disclosure relates generally to water pumping systems for irrigation/domestic purposes. In particular, the present invention relates to a system and method for systematic operation of an alternating power photovoltaic pumping system.
[0028] In an aspect, the present disclosure discloses a system for speed and operation control of a power photovoltaic (PV) pump wherein the system consists of a set of solar/PV panels that converts solar energy into electrical energy and supply the electrical energy to a single stage converter, a controller/digital signal processor (DSP) unit that is configured to take feedback of PV voltage (VPV) and PV current (IPV) from the PV panel wherein PV power (PPV) is calculated from ADC values of the VPV and IPV, and a three phase grid power supply unit that is configured as backup power supply.
[0029] In an embodiment, said single stage converter directly converts the PV power from DC form to AC form through an inverter configured to a semiconductor module of the single stage converter.
[0030] In an embodiment, the calculated PPV direction along with the VPV and IPV direction is continuously monitored and frequency command to a motor configured thereon is varied in order to operate the PV panel at maximum power.
[0031] In an embodiment, maximum power point technique (MPPT) is used to calculate PPV from the ADC values of VPV and IPV.
[0032] In an aspect, said system is further configured with a failsafe algorithm with integrated pump protection.
[0033] In an aspect, the present disclosure discloses a method for speed and operation control of a power photovoltaic (PV) pump wherein the method consists of the steps of:
checking whether the system is to be started with grid mode or PV mode and corresponding commands are automatically provided to the system;
once the system is started with PV mode, checking if PV voltage of the input supply is greater than a pre-defined minimum threshold PV voltage value; and
[0034] In an aspect, the method further consists of the steps of sampling VPV, IPV and calculating PPV values and setting sampling time variable based on the system.
[0035] In an aspect, the method further consists of the steps of observing direction if VPV, IPV and PPV and changing frequency output accordingly.
[0036] In an embodiment, changing of frequency output is configured such that the frequency output is increased if power direction is positive and frequency output is decreased if power direction is negative.
[0037] In an aspect, the method further consists of the step of checking if solar irradiation increases or decreases.
[0038] Fig. 1 illustrates an exemplary representation of architecture for systematic operation of alternate power solar pump 100 wherein a set of PV power panels 102 and a three phase grid power supply 104 are connected to a single stage converter 106 that includes a controller/DSP unit 108 wherein the primary source of power is the set of PV power panels 102. The single stage converter 106 directly converts PV power (PPV) from DC form to AC form through inverters 110-1 and 110-2 configured with a semiconductor module of the single stage converter 106 and provides power to a motor 112 coupled with a pump 114.
[0039] In an aspect, the controller 108 takes feedback of PV voltage (VPV) and PV current (IPV) from the PV panel 102. Further, PPV is calculated from ADC values of VPV and IPV wherein maximum power point technique (MPPT) is used wherein the calculated PPV direction along with the VPV and IPV direction is continuously monitored and frequency command to the motor 112 thereon is varied in order to operate the PV panel 102 at the maximum power i.e., peak of P-V curve of the PV panel 102.
[0040] Fig. 2 illustrates an exemplary flowchart methodology for the operation of PV powered alternate pumping system 200 wherein at step 202, it is checked whether the system is to be started with grid mode or PV mode. Thereafter, if the system is started with PV mode, then at step 204, corresponding PV mode commands are automatically provided to the system. However, if the system is started with grid mode, then at step 206, corresponding grid mode commands are automatically provided to the system. Thereafter, once the system is started with PV mode, at step 208, it is checked if VPV of the input supply is greater than a pre-defined minimum threshold VPV value (VPVmin) and accordingly at step 210, VPV, IPV values are sampled and PPV values are calculated and at step 212, sampling time variable is set based on the system wherein the sampling time variable can be selected such as 500ms, 1s, 2s, etc.
[0041] In an aspect, at step 214, the direction of VPV, IPV and PPV are observed and the frequency output is changed accordingly wherein changing of frequency output is configured such that the frequency output is increased if power direction is positive and frequency output is decreased if power direction is negative. Thereafter, process of MPPT starts and at step 216, the motor 108 is operated at the frequency output obtained at step 214. Thereafter, at step 218, it is checked whether solar irradiation is changing or not. After the execution of step 218, at step 220, the motor is operated at the same frequency as the frequency output of step 216 if solar radiation remains unchanged or has increased.
[0042] In an aspect, if the system is started with grid mode, then at step 206, corresponding grid mode commands are automatically provided to the system. Thereafter, at step 222, frequency ramp of the three phase grid system is started and speed and operation of the motor 108 is controlled accordingly.
[0043] In an aspect, at step 208, if VPV of the input supply is less than the pre-defined minimum threshold VPV value (VPVmin), step 208 is again executed in order to verify that VPV of the input supply is greater than the pre-defined minimum threshold VPV value (VPVmin).
[0044] In an aspect, user can check whether solar power is enough to power the water pump or not and accordingly grid backup mode can be switched. Further, if VPV is greater than the minimum threshold voltage, and if enough power is available then motor frequency is increased, thus providing more power to the pump. Further, the system is provided with pump protections such as dry run protection, low voltage cut-off protection and under frequency cut-off protection, etc.
[0045] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

ADVANTAGES OF THE INVENTION
[0046] The present disclosure provides a system and method for systematic operation of an alternating power photovoltaic pumping system.
[0047] The present disclosure provides a system and method for an alternating power photovoltaic pumping system that incorporates single stage power conversion.
[0048] The present disclosure provides a system and method for an alternating power photovoltaic pumping system that incorporates less power loss compared to two stage pumps.
[0049] The present disclosure provides a system and method for an alternating power photovoltaic pumping system that provides a fail safe algorithm with integrated pump protection.
[0050] The present disclosure provides a system and method for an alternating power photovoltaic pumping system that provides power back up in case of lack of solar energy.
[0051] The present disclosure provides a system and method for an alternating power photovoltaic pumping system that is cost efficient.