FIELD OF INVENTION
The present invention relates to a system and method of synchronization of plurality of power backup systems and generators with effective energy saving.
BACKGROUND & PRIOR ART OF THE INVENTION
Traditionally, in case a group of generators are used to power a load, then one of the generators provides the frequency, phase and/or voltage for the other generators to use so that these parameters may be synchronized. For instance, one approach of operating multiple generators in parallel is to phase-lock each of the generators to a master oscillator. The synchronization may be forwarded to each of the generators, such that each generator will phase-lock onto the synchronization signal, ensuring that the voltage produced by each generator is exactly in-phase with the other generators. Similarly, if a load is powered by a combination of the grid and one or more generators, the generators would obtain the frequency, phase and voltage to use for providing power to the load from sensing the parameters of the power delivered by the grid.
These power sources are often monitored for compliance with the acceptable range for power parameters and disconnected from the load when out of compliance. For instance, if the grid provides power that becomes out of the acceptable range for the parameters for the load, then it may be disconnected from the load. Likewise, if the generator that is providing the parameters for the other generators to use for power production becomes non-compliant and must be disconnected, then all of the associated generators are also disconnected and become unavailable to the load. Generators, including those acting as masters which may provide the synchronization parameters such as frequency, have many moving and mechanical parts thus increasing the likelihood of their breakdown and mechanical failure. This causes the loss of power to the load since no valid reference signal is available to the remaining generators. Further, the power generating system may be unable to meet the power
demands of the consumer with only the remaining power sources.
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Even if a disconnected power source returns to compliancy with the parameter ranges, the other, power sources often must be shut down before the disconnected power source can be reconnected. This shutdown is often necessary because the power provided by the remaining connected power sources may be at a value different than the disconnected power source that is within the acceptable range. If the source is reconnected without synchronizing, the values such as frequency, phase, and/or voltage, one or more of the power sources may receive unneeded power feedback. This shutdown may cause the user to suffer losses from the shutdown in lost time and start-up costs.
Further, when sources are connected in parallel and one source is providing sufficient power to the load, the system may be unaware if other power sources become unavailable. Thus, the power system could be unaware that it is unable to meet increased demand that outstrips the ability of the remaining power sources. Further, the system could be unaware if a graceful shutdown is needed in the event of the failure of the remaining power sources. The need for shutdowns may be decided by the remaining generators becoming overloaded for a defined time interval. Also, large overloads may cause high currents and low voltages which also may require a shutdown.
In many applications of electrical generator systems, steady state load demand is typically low relative to generator power capacity because generator selection is often driven byipeak power requirements ~ resulting in an "oversized" generator most of the time. As an alternative, in certain situations power generation systems could include an electrical energy storage device to supplement generator power during peak usage, which facilitates a reduction in generator size. Alternatively or additionally, a variable speed generator can be used that changes speed based on power demand. A generally fixed AC frequency and voltage output can be provided from a variable speed generator by utilizing appropriate power conversion circuitry. Unfortunately, these systems typically do not offer different voltage outputs simultaneously, such as 120 volts and 240 volts - leading to a need for alternatives.
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US patent no 7,262,520 relates to the systems and methods that allow for individual power sources to be disconnected and reconnected without interrupting the power supply from the other power sources and that allow for these power sources to provide power at substantially the same electrical parameters such as frequency, phase, and voltage. This patent does not talk about the power back up system and remote communication.
US patent no 6,297,977 discloses power generation system that includes multiple generators that are operated in parallel. An inverter of one of the generators is always operated in voltage mode. Power backup systems of the other generators are switched between voltage and current modes. This invention doesn't talk about the power saving with the back up system. Further, there is no intelligent load scheduling.
US patent no 4,1715,17 is directed to a respective control apparatus for each inverter system. It detects the synchronizing signal from the output pulses to which the synchronizing signal has been added .By this, means phase matching of the outputs of the inverter is effected. This invention doesn't include the provision for exchanging of master back up systems and remote communication.
US publication no WO2008063612 relates to a vehicular electric power generation system comprising a variable speed internal combustion engine, a first variable speed electric power generator driven by the engine, a second variable speed electric power generator driven by the engine, a first inverter to receive electric power from the first generator a provide a first controlled electric output, a second inverter to receive electric power from the second generator and provide a second controlled electric output and a controller coupled to the engine. This is an electric drive system.
Publication no JP2004260953 discloses power supply for emergency. It comprises of an uninterruptible power supply comprising a charger, a battery, the inverter, a UPS switch and a CPU, as well as the generator. Just after a blackout, the power from the battery is converted into an AC power with the inverter and then the generator is

activated. The CPU measures the output waveform from the inverter and that from the generator. In this invention, there is no paralleling concept, a simple UPS is interfaced with a generator.
Reference may be made to the article by "Advanced Energy Solutions, Inc, 1999-2005". The article explains that the sine wave inverter is connected to a battery bank, the utility power lines, a standby generator and the house load center. When the batteries are charged, the inverter supplies AC power to house from the batteries. If the batteries become discharged, the inverter supplies the house loads from the utility lines while charging the batteries. If the batteries become fully charged by other power sources, such as photovoltaic modules or a wind or hydroelectric generator, excess power may be sold back to the utility. If utility power fails, the inverter can still operate supplying critical loads. If a standby generator is started, it can also supply power to the loads. The inverter will synchronize to the generator and allow loads to be powered that are too large for either the generator or the inverter to supply alone.
Further, reference may be made to the article by "American Power Corporation, 2004 ". The article explains that the design uses multiple UPS modules that have their output busses cross-connected for multiple power sources to the critical load by static transfer switches. In the event of a power failure on the primary input of the static transfer switch, it will automatically switch to the secondary source. The switching action is a short duration open transition, typically up to 4ms. The primary and secondary inputs of all the switches will be divided among the outputs of the UPS modules. This is done so that the load is balanced across the entire system.
Yet further, reference may be made to the article by "Nigel Colder, September 2008 ". The article explains that synchronization of the inverter to the shore power or a genset can provide substantial benefits.
Again, reference may be made to the product by "Victron Energy". The Multi Power Hybrid combines synchronizing the inverter/ chargers, a generator, a battery and a

control system in one container. Generator use can be minimized with a Multi Power Hybrid. The generator will run only when the batteries need recharging and during periods of peak load, when the combined generator and power backup system power is needed. Whenever the generator is online, it will run at its most efficient load point.
None of the above listed prior art talks about the synchronizing multiple gensets and power backup systems connected in parallel and saving energy which is used in charging the energy storage device, converting DC to AC followed by transferring energy to the load as per the requirement. Therefore, there is requirement for further contributions in this area of technology. A need exists for systems and associated methods that allow the secondary power system to easily determine if a power source becomes unavailable and provides power. A system is needed which can save energy and reduce power loss by automatic activation and deactivation of the connected parallel power backup system/generator.
With all the above discussed restrictions or limitations, it is required to have a system and method for power generation with reduced power loss. The present invention provides synchronization of multiple generators through multiple power backup systems.
OBJECTS OF THE INVENTION
The primary object of the present invention is to provide a system and method for synchronizing multiple generators connected in parallel.
Another object of the present invention is to provide a system and method for synchronizing multiple generators and multiple power backup systems connected in parallel with the generators.
Still another object of the present invention is to provide a system and method for synchronizing multiple generators and multiple power backup systems which can save energy and utilize it in the charging of energy storage device.

Yet another object of the present invention is to provide a system and method for synchronizing in which the user can set up the time of minimum usage of power or
load through power backup system which is connected to the energy storage device.
Still another object of the present invention is to provide user a system and method for synchronizing which supplies power through the power backup system instead of generator during low usage time.
Another object of the present invention is to provide a system and method for synchronizing which saves large amount of energy/ fuel.
Still another object of the present invention is to provide a system and a method to supply power as per the load during power failure.
Another object of the present invention is to provide a power source for backup which can be used for different apparatus simultaneously or selectively.
Yet another object of the present invention is to provide an apparatus for the synchronization control of a plurality of power backup systems, which is simple in
construction.
Still another object of the present invention is to provide the synchronization control of a plurality of power backup systems and generators, which can ensure
synchronization of the power backup systems & generators and is highly reliable.
Yet another object of the present invention is to provide a synchronization method to supply power during failure as per the requirement.
Still another object of the present invention is to provide a synchronization method which reduces power loss and saves significant energy.
Another object of the present invention is to provide a synchronization method of power backup system and generator which switches on power backup system and generator in a sequential manner as per power requirement.

Yet another object of the present invention is to provide a simple control mechanism
and structure.
Still another object of the present invention is to provide a system and a method for
synchronizing secondary power sources and with remote monitoring and controlling of the entire system.
Yet another object of the present invention is that the phases of outputs of the power backup systems as well as generators coincide both when plurality of power backup systems and/ or generators are being started and also during steady operation.
SUMMARY
According to this invention, there is provided synchronization control of a plurality of
generators connected in parallel and power backup systems connected in parallel to
the generators. The present invention provides a system and method for supplying
power to the load using multiple power sources. The phases and voltages of the
outputs of the power backup systems and generators are synchronized in such a way
that, they coincide both when plurality of power backup systems and generators are
being started and also during steady operation. Voltage and phases are monitored to
know whether they come in a predefined range.
Another aspect of the present invention provides a power generating system, which includes a generator connected with a power backup system capable of producing power which is to be supplied during power failure to a load. A controller connected to the power backup system is capable of providing the desired power output by switching' on the required number of generators and power backup systems.
According to another aspect of the present invention, for synchronization between a number of generators and power back up systems, the present invention comprises such as but not limited to a reference oscillator or phase lock loop (PLL), a synchronizing signal generating circuit etc. The synchronizing signal generating

circuit generates synchronizing signals in response to the output of this reference oscillator and supplies an output in which the generated synchronizing signals are added to the output of the reference oscillator. For each power backup system, a respective gate control circuit which responds to the output of this synchronization signal generator is connected.
The power backup system is such as but not limited to the inverter or uninterrupted power supply.
In an embodiment according to the present invention, any number of generators and power backup systems can be attached. During attaching or detaching the back up system to the bus bar (main supply) and during the steady state operation, the user communicates the new entry system by configuring the new identification number through the remote device or user friendly keypad at the master system and then the master back up system senses the output of new back up system. After this process, the new system is synchronised to the main bus bar.
In an embodiment according to the present invention, one or more fuel cell
devices, capacitive-based storage devices, and/or a different form of rechargeable
electrical energy storage apparatus could be used as an alternative or addition to an
electrochemical cell or battery type of storage device to store the power.
In another embodiment according to the present invention, the generator can be gasoline, diesel, gaseous, or hybrid fuelled; or fuelled in a different manner as would occur to those skilled in the art.
STATEMENT OF INVENTION
According to this invention, there is provided a system of synchronization of plurality of power backup systems and generators comprising a group of generators and/ or a group of power backup systems or any combination thereof, wherein each power backup system comprises a reference oscillator circuit, a synchronization circuit, a

controller and a feed back circuit in which the feedback circuit uses the extra power of the generator to charge the secondary storage device of the power backup system, the power backup systems are connected in parallel with the generators, and generators are connected in parallel with each other, and provided with unique identity code which is stored in the said controller.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Further objects and advantages of this invention will be more apparent from the
ensuing description when read in conjunction with the accompanying drawings and
wherein:
Fig. 1 shows the system according to the present invention.
Fig. 2 shows the block diagram of the synchronization circuit according to the present
invention.
Fig. 3 A and B shows the flow chart according to the present invention
DETAIL DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS:
Referring to fig. 1, the power generating system includes such as but not limited to N generators and N or N-l power backup systems with each generator having a maximum power capacity. The generators are connected in parallel with each other and the power backup systems are also connected in parallel with the generators. The use of generators and power back up systems depend on the requirement of load to supply the desired power. The backup system comprises a reference oscillator or phase lock loop (PLL), a synchronizing signal generating circuit and a feed back circuit. The synchronizing signal generating circuit generates synchronizing signals in response to the output of this reference oscillator and supplies an output in which the generated synchronizing signals are added to the output of the reference oscillator. For each power backup system, a respective gate control circuit which responds to the output of this synchronization signal generator is connected. The synchronization
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signal may be sent to each of the generators and/ or power backup systems such that these phase lock onto the synchronization signal, ensuring that the voltage produced by each generator/ power back up system is exactly in-phase with the others.
A master power backup system is provided, wherein user selects the desired load and run time for the load. The details such as but not limited to the capacity, run time, exact load, back up time, second master priority setting, alert email, phone number, unique identification number of each system of backup systems and generators are stored in the master backup system. The master system's settings are carried out through the communication software. Thus the master system in case the master back up system gets changed. Each backup system and the generator are provided with unique identity which is stored in the master backup system. The priority of the backup system and generators are also predefined. The controller of the master backup system calculates the number of the generators and power backup systems to be ON as per the required/ predefined load. It compares the priority reference with the unique codes and identifies the systems to be ON and switches ON the backup systems and generators. The power back up system is always on priority as the power generation cost per unit is less when compared to generator. This is possible only when the storage medium has enough charge. The remaining generators/ power backup systems remain off. When the load increases, the master backup system calculates the number of generators and backup systems to be ON and extra generator/ power back up system turns on as per the predefined sequence according to the miniiVial increased requirement and rest of the systems remains off. If any of the sequential system is to be ON and the system is in faulty condition, the master system switches over to the next system and sends an alarm to the user. According to the load and run time set by the user, the master system controller switches ON the generator or power back up system giving priority to the power back up system.
The feed back loop from the generator is provided to charge the storage devices of the power backup system. In case, the power generated by generators/ power back up systems is not being utilized completely, the unutilized power is used for charging the energy storage device connected to the power backup system. The stored DC is

converted into AC to run the load, which is connected to the back up system only if the storage device is charged enough to provide power to the load. Otherwise the load is powered by generator and the storage medium is charged through the power back up system. The power back up system is such as but not limited to the or inverter. The present invention provides power backup which is used for different apparatus simultaneously or selectively. The output voltage and frequency of the generator and generatori or generator and power back up system is synchronized and is supplied to the load. This energy can be used in other forms too. The generator whose power is not being utilized fully can be switched off after predefined time.
The output of the first generator is matched to the phases of the outputs of other generators and power backup systems. To maintain synchronization between power backup systems-power backup system, power backup system-generator, generator-generator, the auto selected master power backup system tracks the generated AC cycles.This is done by using the phase locked loop and the synchronising signal generating circuit. The AC cycles sensed by the master system are taken as reference and the feedback is taken from all the generators and power back up systems which are run according to the user configured run time and load and are represented by such as but not limited to zero crossing/phase reference signals. With every cycle, the master power backup system communicates a synchronization signal to the generators and the other power backup systems to facilitate synchronization of output waveform with the master power backup system as well as generator. The synchronization signal can be treated like an interrupt signalling the start of the generation of the AC cycles. The output of the master back up system is used as a reference signal by all other power back up systems/ generators being operated. The system decides the master system automatically as per predefined instructions. These instructions are given by the user through the connected communicating device and the second master device is selected according to the priority set by the user. In case of the failure of the master power backup system, the system automatically selects another master unit as per the predefined programmable instructions. This is done by setting the second master through the communicating device connected to the master system. Consequently, the outputs of the other back up systems are phase-locked and regulated according to the output of the new master.

The synchronizing signal generating circuit comprises a counter to which the output signals of the reference oscillator are supplied as input. When the present invention is used, the gate control circuits are synchronized in every cycle and therefore not readily affected by faulty operation due to noise or the like. Also, when a power backup system or a generator, which is out of operation while the other power backup systems are operating, is to be started, the signals to the outputs of the power backup systems and generators can be reliably synchronized for all the power backup systems and generators. Therefore, the phases and voltages of the outputs of the power generating systems can be perfectly matched.
The present invention is monitored and controlled by the user from remote location. All the parameters of the system can be displayed and modified through a device with keypad and a display. During any faulty condition an alert would be sent to the user. The system will send such as but not limited to SMS, calls, mails or raise alarm. The history/ data of the present invention can also be stored/ logged by the user from remote location.
In an aspect, one or more fuel cell devices, capacitive-based storage devices, and/or a different form of rechargeable electrical energy storage apparatus could be used as an alternative or addition to an electrochemical cell or battery type of storage device to store the power. Furthermore, one or more fuel cells could be used to provide some or all of the power from generator and/or energy storage device. Engine can be gasoline, diesel, gaseous, or hybrid fuelled; or fuelled in a different manner as would occur to those skilled in the art.
The below may be considered as exemplary embodiment.
When the load demands such as but not limited to 2.5 MKW of power, two generators and two power backup systems operate to supply the desired power. The remaining generator, remains off. When the load is increased to any number such as but not limited tq 3.5MkW, the third generator and power backup system are switched on to supply the desired amount of power and the rest remains off. If the required power is of such value (such as but not limited to 3.8MkW, which is beyond three generators

and power backup systems) that one extra generator is required to be switched on, but its full power is not being utilized, then the remaining power of the generator which is getting waste is used for charging the energy storage device connected to the power backup system.
Numerous modifications and adaptations of the system of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the true spirit and scope of this invention.

WE CLAIM
1. A system of synchronization of plurality of power backup systems and
generators comprising a group of generators and/ or a group of power backup
systems or any combination thereof, wherein each power backup system
comprises a reference oscillator circuit, a synchronization circuit, a controller
and a feed back circuit in which the feedback circuit uses the extra power of the
generator to charge the secondary storage device of the power backup system,
the power backup systems are connected in parallel with the generators, and
generators are connected in parallel with each other, and provided with unique
identity code which is stored in the said controller.
2. The system of synchronization of plurality of power backup systems and generators, as claimed in claim 1, wherein the system may comprise any number of generators and power backup systems connected to each other.
3. The system of synchronization of plurality of power backup systems and generators, as claimed in any of the preceding claims, wherein the output of the first generator is matched to the phases of the outputs of other generators and power backup systems.
4. The system of synchronization of plurality of power backup systems and
generators, as claimed in any of the preceding claims, wherein the controller
selects any combination of generator and/ or power backup and provides the
desired power output by switching on the required number of generators and
power backup systems.
5. The system of synchronization of plurality of power backup systems and
generators, as claimed in any of the preceding claims, wherein atleast one fuel cell
device, capacitive-based storage device, and/or a different form of rechargeable
electrical energy storage apparatus could be used as an alternative or addition to
an electrochemical cell or battery type of storage device to store the power.

6. The system of synchronization of plurality of power backup systems and generators, as claimed in any of the preceding claims, wherein the generator may be gasoline, diesel, gaseous, or hybrid fuelled; or fuelled in a different manner.
7. The system of synchronization of plurality of power backup systems and generators, as claimed in any of the preceding claims, wherein the system automatically selects the master system as per predefined instructions.
8. The system of synchronization of plurality of power backup systems and generators, as claimed in any of the preceding claims, wherein during the failure of the master power backup system, the system automatically selects another master unit as per the predefined programmable instructions and, the outputs of the other back up systems are phase-locked and regulated according to the output of the new master.
9. The system of synchronization of plurality of power backup systems and generators, as claimed in any of the preceding claims, wherein the user sets up the time of minimum usage of power or load through power backup system which is connected to the energy storage device.
10. The system of synchronization of plurality of power backup systems and generators, as claimed in any of the preceding claims, wherein the system provides power backup which is used for different apparatuses simultaneously or selectively.
11. The system of synchronization of plurality of power backup systems and generators, as claimed in any of the preceding claims, wherein in case the system to be ON is in faulty condition, the master system switches over to the next system and sends an alarm to the user.
12. The system of synchronization of plurality of power backup systems and generators substantially as herein described with reference to the accompanying drawing.