CN213754007U - Distributed energy storage grid-connected protection device - Google Patents
Distributed energy storage grid-connected protection device Download PDFInfo
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- CN213754007U CN213754007U CN202022018636.2U CN202022018636U CN213754007U CN 213754007 U CN213754007 U CN 213754007U CN 202022018636 U CN202022018636 U CN 202022018636U CN 213754007 U CN213754007 U CN 213754007U
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Abstract
The utility model discloses a distributed energy storage grid-connected protection device, which comprises an energy storage converter module, a signal adjusting module and a grid-connected protection control module; the input end of the energy storage converter module is connected with a distributed energy storage device, the output end of the energy storage converter module is connected with the input end of the grid-connected protection control module, the output end of the grid-connected protection control module is connected with an alternating current power grid, and a load is connected between the output end of the grid-connected protection control module and the output end of the alternating current power grid; the input end of the signal adjusting module is connected with the output end of the energy storage current converting module, the input end of the signal adjusting module is connected with the output end of the alternating current power grid, and the output end of the signal adjusting module is connected with the control end of the energy storage current converting module. The embodiment of the utility model provides an in, can cut off the trouble that distributed energy storage device arouses fast reliably through the protection control module that is incorporated into the power networks, guarantee electric power system's steady operation.
Description
Technical Field
The utility model relates to an electric power tech field particularly, relates to a distributed energy storage protection device that is incorporated into power networks.
Background
With continuous breakthrough of energy storage technology, gradual reduction of cost and evolution and development of demand side, the wide application of distributed energy storage in power systems is a necessary trend of future power grid development. When the distributed energy storage device is put into use in an alternating current power grid formally, the function that the distributed energy storage devices can be automatically adjusted from an island operation mode to a grid-connected operation mode can be realized, and the problem of rapid protection of the alternating current power grid under the condition that the distributed energy storage devices have faults such as short circuit and the like is also required to be considered.
Disclosure of Invention
The utility model aims to overcome prior art not enough, the utility model provides a distributed energy storage protection device that is incorporated into the power networks can cut off the trouble that distributed energy storage device arouses fast reliably through setting up protection control module that is incorporated into the power networks, ensures electric power system's steady operation.
In order to solve the above problems, the utility model provides a distributed energy storage grid-connected protection device, the device includes energy storage converter module, signal adjustment module and grid-connected protection control module;
the input end of the energy storage converter module is connected with a distributed energy storage device, the output end of the energy storage converter module is connected with the input end of the grid-connected protection control module, the output end of the grid-connected protection control module is connected with an alternating current power grid, and a load is connected between the output end of the grid-connected protection control module and the output end of the alternating current power grid;
the input end of the signal adjusting module is connected with the output end of the energy storage converter module, the input end of the signal adjusting module is connected with the output end of the alternating current power grid, and the output end of the signal adjusting module is connected with the control end of the energy storage converter module.
In an optional implementation manner, the grid-connected protection control module includes a current sensor, a current transformer, an overcurrent protector, an anti-tripping relay and a circuit breaker;
the input end of the current sensor is connected with the output end of the energy storage current transformation module, the output end of the current sensor is connected with the input end of the current transformer, the output end of the current transformer is connected with the input end of the overcurrent protector, the output end of the overcurrent protector is connected with the input end of the anti-tripping relay, the output end of the anti-tripping relay is connected with the circuit breaker, and the circuit breaker is connected between the output end of the energy storage current transformation module and the output end of the alternating current power grid.
In an optional embodiment, the energy storage and conversion module includes an inverter unit and a filter unit;
the input end of the inversion unit is connected with the distributed energy storage device, the output end of the inversion unit is connected with the input end of the filter unit, the output end of the filter unit is connected with the circuit breaker, and the control end of the inversion unit is connected with the output end of the signal adjusting module.
In an optional embodiment, the inverter unit is a three-phase full-bridge inverter.
In an optional embodiment, the filtering unit is an LC filter.
In an optional embodiment, the signal adjusting module includes a power collecting circuit, a droop controller, and a voltage-current dual-loop control circuit;
the input end of the power acquisition circuit is connected with the output end of the alternating current power grid, the input end of the power acquisition circuit is connected with the output end of the filtering unit, the output end of the power acquisition circuit is connected with the input end of the droop controller, the output end of the droop controller is connected with the input end of the voltage and current double-loop control circuit, and the output end of the voltage and current double-loop control circuit is connected with the control end of the inversion unit.
In the embodiment of the utility model, the signal adjusting module can be used to complete the real-time adjustment of the working state of the energy storage converter module in combination with the actual power supply condition of the alternating current network side, so as to ensure the smooth grid connection of the distributed energy storage device; the grid-connected protection control module can be used for monitoring the output state of the energy storage converter module in real time, and can ensure that faults caused by distributed energy storage devices are cut off quickly and reliably so as to maintain the stable operation of the power system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural composition diagram of a distributed energy storage grid-connected protection device disclosed in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Fig. 1 is a schematic diagram illustrating a structural composition of a distributed energy storage grid-connected protection device in an embodiment of the present invention, where the device includes an energy storage converter module, a signal conditioning module, and a grid-connected protection control module; the input end of the energy storage converter module is connected with a distributed energy storage device, the output end of the energy storage converter module is connected with the input end of the grid-connected protection control module, the output end of the grid-connected protection control module is connected with an alternating current power grid, and a load is connected between the output end of the grid-connected protection control module and the output end of the alternating current power grid; the input end of the signal adjusting module is connected with the output end of the energy storage converter module, the input end of the signal adjusting module is connected with the output end of the alternating current power grid, and the output end of the signal adjusting module is connected with the control end of the energy storage converter module.
Furthermore, the grid-connected protection control module comprises a current sensor, a current transformer, an overcurrent protector, an anti-tripping relay and a circuit breaker; the input end of the current sensor is connected with the output end of the energy storage current transformation module, the output end of the current sensor is connected with the input end of the current transformer, the output end of the current transformer is connected with the input end of the overcurrent protector, the output end of the overcurrent protector is connected with the input end of the anti-tripping relay, the output end of the anti-tripping relay is connected with the circuit breaker, and the circuit breaker is connected between the output end of the energy storage current transformation module and the output end of the alternating current power grid.
In the embodiment of the present invention, the current sensor can monitor the output current of the energy storage converter module in real time, so as to detect the overcurrent phenomenon caused by the faults such as short circuit and grounding, which may occur at the distributed energy storage device end during the operation of the equipment; the overcurrent protector can complete control response to the overcurrent phenomenon so as to trigger the circuit breaker to rapidly act to trip, and the tripping-prevention relay can prevent the circuit breaker from tripping and closing for multiple times, so that the alternating current power grid side is protected from being influenced by faults of the distributed energy storage devices. The current transformer can convert a large primary side current measured by the current sensor into a small secondary side current for use based on an electromagnetic induction principle, so that the current transformer can accord with a judgment interval of the over-current protector, and the over-current protector can implement opening operation control on the circuit breaker by verifying whether an over-current phenomenon exists or not.
Furthermore, the energy storage and current transformation module comprises an inversion unit and a filtering unit; the input end of the inversion unit is connected with the distributed energy storage device, the output end of the inversion unit is connected with the input end of the filter unit, the output end of the filter unit is connected with the circuit breaker, and the control end of the inversion unit is connected with the output end of the signal adjusting module. The utility model discloses in the implementation process, the contravariant unit can with based on the pulse width modulation mode DC power supply that distributed energy storage device provided converts the required alternating current power supply that is incorporated into the power networks into, recycles the filtering unit can eliminate most low order harmonics that are higher than cut-off frequency in this alternating current power supply to acquire level and smooth sine wave and guarantee the power supply quality. Wherein, the contravariant unit is the full bridge type dc-to-ac converter of three-phase, the filtering unit is the LC wave filter, as common dc-to-ac converter of electric power system and wave filter the embodiment of the utility model provides an in not expand the explanation to its theory of operation.
Furthermore, the signal adjusting module comprises a power acquisition circuit, a droop controller and a voltage and current double-loop control circuit; the input end of the power acquisition circuit is connected with the output end of the alternating current power grid, the input end of the power acquisition circuit is connected with the output end of the filtering unit, the output end of the power acquisition circuit is connected with the input end of the droop controller, the output end of the droop controller is connected with the input end of the voltage and current double-loop control circuit, and the output end of the voltage and current double-loop control circuit is connected with the control end of the inversion unit.
In the embodiment of the present invention, the power collecting circuit can respectively collect the output powers of the ac power grid and the energy storage converter module; the droop controller can realize the synchronous control of the frequency and the voltage of the energy storage current conversion module and the alternating current network side based on the real-time power information provided by the power acquisition circuit so as to reduce the impact current caused by grid connection; the voltage and current dual-loop control circuit adopts a combined control strategy of a current inner loop and a voltage outer loop to adjust the PWM signal of the energy storage and conversion module, wherein the current inner loop is used for controlling grid-connected current tracking instruction current at a later stage so as to realize high-power grid connection of the energy storage and conversion module, and the voltage outer loop is used for stabilizing direct-current voltage at the distributed energy storage device side so as to realize seamless switching from island to grid connection of the energy storage and conversion module and guarantee the stability of a power system.
In the embodiment of the utility model, the signal adjusting module can be used to complete the real-time adjustment of the working state of the energy storage converter module in combination with the actual power supply condition of the alternating current network side, so as to ensure the smooth grid connection of the distributed energy storage device; the grid-connected protection control module can be used for monitoring the output state of the energy storage converter module in real time, and can ensure that faults caused by distributed energy storage devices are cut off quickly and reliably so as to maintain the stable operation of the power system.
The above detailed description is made on a distributed energy storage grid-connected protection device provided by the embodiment of the present invention, and a specific example is adopted herein to explain the principle and the implementation manner of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (6)
1. A distributed energy storage grid-connected protection device is characterized by comprising an energy storage converter module, a signal adjusting module and a grid-connected protection control module;
the input end of the energy storage converter module is connected with a distributed energy storage device, the output end of the energy storage converter module is connected with the input end of the grid-connected protection control module, the output end of the grid-connected protection control module is connected with an alternating current power grid, and a load is connected between the output end of the grid-connected protection control module and the output end of the alternating current power grid;
the input end of the signal adjusting module is connected with the output end of the energy storage converter module, the input end of the signal adjusting module is connected with the output end of the alternating current power grid, and the output end of the signal adjusting module is connected with the control end of the energy storage converter module.
2. The distributed energy storage grid-connected protection device according to claim 1, wherein the grid-connected protection control module comprises a current sensor, a current transformer, an overcurrent protector, an anti-tripping relay and a circuit breaker;
the input end of the current sensor is connected with the output end of the energy storage current transformation module, the output end of the current sensor is connected with the input end of the current transformer, the output end of the current transformer is connected with the input end of the overcurrent protector, the output end of the overcurrent protector is connected with the input end of the anti-tripping relay, the output end of the anti-tripping relay is connected with the circuit breaker, and the circuit breaker is connected between the output end of the energy storage current transformation module and the output end of the alternating current power grid.
3. The distributed energy storage grid-connected protection device according to claim 2, wherein the energy storage converter module comprises an inverter unit and a filter unit;
the input end of the inversion unit is connected with the distributed energy storage device, the output end of the inversion unit is connected with the input end of the filter unit, the output end of the filter unit is connected with the circuit breaker, and the control end of the inversion unit is connected with the output end of the signal adjusting module.
4. The distributed energy storage grid-connected protection device according to claim 3, wherein the inversion unit is a three-phase full-bridge inverter.
5. The distributed energy storage grid-connected protection device according to claim 3, wherein the filtering unit is an LC filter.
6. The distributed energy storage grid-connected protection device according to claim 3, wherein the signal adjusting module comprises a power acquisition circuit, a droop controller and a voltage-current double-loop control circuit;
the input end of the power acquisition circuit is connected with the output end of the alternating current power grid, the input end of the power acquisition circuit is connected with the output end of the filtering unit, the output end of the power acquisition circuit is connected with the input end of the droop controller, the output end of the droop controller is connected with the input end of the voltage and current double-loop control circuit, and the output end of the voltage and current double-loop control circuit is connected with the control end of the inversion unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022018636.2U CN213754007U (en) | 2020-09-14 | 2020-09-14 | Distributed energy storage grid-connected protection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022018636.2U CN213754007U (en) | 2020-09-14 | 2020-09-14 | Distributed energy storage grid-connected protection device |
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| CN213754007U true CN213754007U (en) | 2021-07-20 |
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