CN220652985U - High-voltage energy storage system and device at power grid side - Google Patents
High-voltage energy storage system and device at power grid side Download PDFInfo
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- CN220652985U CN220652985U CN202322227566.5U CN202322227566U CN220652985U CN 220652985 U CN220652985 U CN 220652985U CN 202322227566 U CN202322227566 U CN 202322227566U CN 220652985 U CN220652985 U CN 220652985U
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- 238000004146 energy storage Methods 0.000 title claims abstract description 52
- 230000002457 bidirectional effect Effects 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 5
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 5
- 230000002401 inhibitory effect Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
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- 238000012423 maintenance Methods 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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Abstract
The utility model discloses a high-voltage energy storage system at a power grid side, which comprises: the device comprises an access unit, a reactance unit, a converter unit and a battery unit; the access unit comprises an isolating switch and a starting loop, the isolating switch is used for isolating the power grid from the starting loop, and the starting loop is used for pre-charging and connecting high-voltage power of the power grid into the reactance unit; the reactance unit is respectively connected with the starting loop and the current converting unit, and the current converting unit comprises a first bridge arm structure and a second bridge arm structure which are symmetrically arranged; the battery unit is connected with the converter unit and comprises a plurality of battery cells which are connected in series. The battery units are connected in series, so that internal circulation is effectively avoided, the capacity of the battery units can be expanded at will through the first bridge arm structure and the second bridge arm structure, the production cost is low, and the method can be widely applied to the technical field of power grid energy storage.
Description
Technical Field
The utility model relates to the technical field of power grid energy storage, in particular to a high-voltage energy storage system at a power grid side.
Background
In recent decades, with the continuous promotion of energy transformation, as a key for promoting renewable energy sources to move from alternative energy sources to main energy sources, energy storage technology is highly concerned in the industries of energy sources, traffic, electric power, telecommunication and the like of various countries, the capacity of an energy storage system is developed from kWh to MWh, the 100MWh level is broken through at present, and the energy storage system is gradually applied to a high-voltage system.
In a large-capacity energy storage system, the system often contains tens of thousands of battery units, the prior art generally adopts a scheme of a battery pack, the battery units are connected in parallel by a plurality of battery clusters, a large circulation current exists in the battery clusters, so that the circulation efficiency of the whole system is reduced, once the capacity of the battery units is assembled, the system cannot be adjusted at any time, and a plurality of energy storage converters are required to be arranged in an environment where a plurality of groups of storage batteries run, so that the cost is increased.
Disclosure of Invention
In view of the above, an object of the embodiments of the present utility model is to provide a high-voltage energy storage system on a power grid side, which can effectively avoid internal circulation, randomly expand the capacity of a battery unit, and has low production cost.
In a first aspect, an embodiment of the present utility model provides a high-voltage energy storage system on a power grid side, where the high-voltage energy storage system is directly and electrically connected to the power grid, and the high-voltage energy storage system includes an access unit, a reactance unit, a converter unit, and a battery unit;
the access unit comprises an isolating switch and a starting loop, wherein the isolating switch is used for isolating the power grid from the starting loop, and the starting loop is used for pre-charging and accessing high-voltage power of the power grid into the reactance unit;
the reactance unit is connected with the starting loop at a first end and the converter unit at a second end, and is used for filtering switching ripple waves and inhibiting common mode current;
the converter unit comprises a first bridge arm structure and a second bridge arm structure, wherein the first bridge arm structure and the second bridge arm structure are symmetrically arranged and are used for realizing free bidirectional flow of electric energy in the power grid and the battery unit;
the battery unit is connected with the current converting unit and is used for storing electric energy of the power grid or outputting electric energy to the power grid, and comprises a plurality of battery units which are connected in series.
Optionally, the isolating switch comprises a grounding knife switch, and the grounding knife switch is used for isolating the starting loop from the power grid.
Optionally, the starting circuit includes a starting resistor, a first starting switch and a second starting switch, and the starting resistor is electrically connected with the first starting switch and the second starting switch respectively.
Optionally, the first bridge arm structure includes three groups of first converters, the first converters are provided in plurality, the first converters are connected in series, the second bridge arm structure includes three groups of second converters, the second converters are provided in plurality, and the second converters are connected in series.
Optionally, the reactance unit includes a plurality of reactors, one of which is connected to a set of the first converters, and one of which is connected to a set of the second converters.
Optionally, the first converter and the second converter have the same structure, and the first converter or the second converter includes a first IGBT, a second IGBT, and a capacitor, where the first IGBT and the second IGBT are connected and form a half-bridge structure, and the capacitor is connected to the first IGBT and the second IGBT, respectively.
Optionally, the battery unit forms a plurality of battery modules, and a plurality of battery modules are connected in series.
Optionally, the battery cell comprises a lithium iron phosphate battery.
Optionally, the access unit and the reactance unit are electrically connected through three phases.
In a second aspect, an embodiment of the present utility model provides a high-voltage energy storage device on a grid side, including the high-voltage energy storage system and an equipment housing, where the high-voltage energy storage system is disposed in the equipment housing.
The embodiment of the utility model has the following beneficial effects: the embodiment of the utility model provides a high-voltage energy storage system at a power grid side, which comprises an access unit, a reactance unit, a converter unit and a battery unit; the access unit comprises an isolating switch and a starting loop, wherein the isolating switch is used for isolating the power grid from the starting loop, and the starting loop is used for pre-charging and accessing high-voltage power of the power grid into the reactance unit; the reactance unit is connected with the starting loop at a first end and the converter unit at a second end, and is used for filtering switching ripple waves and inhibiting common mode current; the converter unit comprises a first bridge arm structure and a second bridge arm structure, wherein the first bridge arm structure and the second bridge arm structure are symmetrically arranged and are used for realizing free bidirectional flow of electric energy in the power grid and the battery unit; the battery unit is connected with the current converting unit and is used for storing electric energy of the power grid or outputting electric energy to the power grid, and comprises a plurality of battery units which are connected in series. The battery cells are connected in series, so that internal circulation is effectively avoided, the capacity of the battery cells can be expanded at will through the first bridge arm structure and the second bridge arm structure, and the production cost is low.
Drawings
Fig. 1 is a block diagram of a high-voltage energy storage system on a power grid 5 side according to an embodiment of the present utility model;
fig. 2 is a circuit diagram of a high-voltage energy storage system on the side of a power grid 5 according to an embodiment of the present utility model;
FIG. 3 is a circuit diagram of another high voltage energy storage system on the grid 5 side provided by an embodiment of the present utility model;
reference numerals: an access unit 1, an isolating switch 11, a starting loop 12, a reactance unit 2, a converter unit 3, a converter 31, a battery unit 4 and a power grid 5.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In embodiments of the utility model, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
Referring to fig. 1, an embodiment of the present utility model provides a high-voltage energy storage system on a power grid 5 side, the high-voltage energy storage system is directly and electrically connected with the power grid 5, and the high-voltage energy storage system includes an access unit 1, a reactance unit 2, a converter unit 3 and a battery unit 4;
the access unit 1 comprises an isolating switch 11 and a starting loop 12, wherein the isolating switch 11 is used for isolating the power grid 5 from the starting loop 12, and the starting loop 12 is used for pre-charging and accessing high-voltage power of the power grid 5 into the reactance unit 2;
the reactance unit 2 has a first end connected with the starting loop 12 and a second end connected with the converter unit 3, and is used for filtering switching ripple and suppressing common mode current;
the converter unit 3 comprises a first bridge arm structure and a second bridge arm structure, wherein the first bridge arm structure and the second bridge arm structure are symmetrically arranged and are used for realizing free bidirectional flow of electric energy in the power grid 5 and the battery unit 4;
the battery unit 4 is connected with the converter unit 3, and is used for storing electric energy of the electric network 5 or outputting electric energy to the electric network 5, and comprises a plurality of battery units connected in series.
Specifically, the alternating current of the power grid 5 is input into the reactance unit 2 after passing through the isolating switch 11 and the starting loop 12 of the access unit 1, the isolating switch 11 is closed to isolate the power grid 5 from the starting loop 12, the starting loop 12 precharges the power unit and connects the alternating current high-voltage of the power grid 5 into the reactance unit 2, the first end of the reactance unit 2 is connected with the starting loop 12, the alternating current high-voltage second end of the power grid 5 is connected with the converter unit 3, and the reactance unit 2 filters switching ripple in output current and inhibits common mode current between the converter unit 3 and the power grid 5; the converter unit 3 converts the voltage of the alternating-current high-voltage power through a first bridge arm structure and a second bridge arm structure to obtain direct-current voltage, and then the direct-current voltage is input into the battery unit 4 for charging; the first bridge arm structure and the second bridge arm structure are symmetrically arranged, electric energy flows in a free bidirectional mode between the power grid 5 and the battery unit 4 through the first bridge arm structure and the second bridge arm structure, namely, when the voltage of the power grid 5 is too low, the battery unit 4 supplements electricity for the power grid 5, the first bridge arm structure and the second bridge arm structure convert direct-current voltage of the battery unit 4 into alternating-current voltage, the alternating-current voltage is filtered through the reactance unit 2 and then is input into the isolating switch 11 and the starting loop 12, and then the alternating-current voltage is input into the power grid 5 to supplement electricity for the power grid 5.
Referring to fig. 2, the isolating switch 11 optionally comprises a grounding switch for isolating the starting circuit 12 from the power grid 5.
Specifically, the isolating switch QS1 is connected with the grounding switch GE1, and the grounding switch GE1 has a main function of isolating the high-voltage energy storage system from the electrified part of the power grid 5 during maintenance, so as to ensure the safety of maintenance work, the grounding switch GE1 prevents residual charges in the high-voltage energy storage system after the power supply is disconnected, the safety of maintenance electricians is endangered, a discharging function is played, and the power grid 5 and the reactance unit 2 are isolated after the isolating switch QS1 is disconnected. A starting switch QF11 is further arranged between the power grid 5 and the access electric element, and after the starting switch QF11 is closed, the power grid 5 can be started to charge or receive electric energy of the high-voltage energy storage system.
Optionally, the starting circuit 12 includes a starting resistor, a first starting switch and a second starting switch, and the starting resistor is electrically connected with the first starting switch and the second starting switch respectively.
Specifically, the starting circuit 12 mainly comprises a starting resistor R, a starting switch QF2 and a starting switch QF1, the resistor R and the starting switch QF2 are connected in series and then connected in parallel with the starting switch QF1, and the starting circuit is mainly used for precharging a power unit and connecting the power grid 5 to high voltage when the high voltage energy storage system is started.
Optionally, the first bridge arm structure includes three groups of first converters 31, the first converters 31 are provided in plurality, the plurality of first converters 31 are connected in series, the second bridge arm structure includes three groups of second converters 31, the second converters 31 are provided in plurality, and the plurality of second converters 31 are connected in series.
Specifically, the first bridge arm structure includes three groups of first converters 31, each group of first converters 31 includes N first converters 31, the first converters 31 are connected in series to form a group of first converters 31, each group of first converters 31 is formed from K 1 To K N The method comprises the steps of carrying out a first treatment on the surface of the Correspondingly, the second bridge arm structure comprises three groups of second converters 31, each group of second converters 31 comprises N second converters 31, the second converters 31 are mutually connected in series to form a group of second converters 31, and each group of second converters 31 is formed by K 1 To K N 。
In a specific embodiment, the converter unit 3 is formed by 6N converters 31 into 6 symmetrical bridge arms, and is divided into a left bridge arm structure and a right bridge arm structure, and 3N converter units are connected in series to form a left/right bridge arm, where each bridge arm includes N converters 31 and is capable of outputting n+1 levels. This structure has excellent expansibility, and the number of output levels can be increased/decreased conveniently by the number of series connection of the converters 31 to adapt to different voltage levels and flexibly configure. The converter unit 3 is used as an intermediate link between the alternating current power grid 5 and the direct current battery, and can realize free bidirectional flow of energy on the alternating current power grid 5 side and the direct current battery side.
Referring to fig. 2, alternatively, the reactance unit 2 includes a plurality of reactors, one of which is connected to a set of the first converters 31, and one of which is connected to a set of the second converters 31.
Specifically, the reactance unit 2 comprises 6 single-phase filter reactors, the 6 single-phase filter reactors form 6 bridge arm structures, the 6 bridge arm structures are connected between the starting loop 12 and the converter unit 3, energy buffering is achieved through the 6 bridge arm structures, switching ripple waves in output current of the high-voltage energy storage system are reduced, and common mode current between the converter unit 3 and the power grid 5 is restrained; the short-circuit impedance is improved, the short-circuit capacity is reduced, the short-circuit current is reduced, and the safety and stability of the system are improved.
Alternatively, the first inverter 31 and the second inverter 31 have the same structure, and the first inverter 31 or the second inverter 31 includes a first IGBT, a second IGBT, and a capacitor, where the first IGBT and the second IGBT are connected and form a half-bridge structure, and the capacitor is connected to the first IGBT and the second IGBT, respectively.
Specifically, an insulated gate bipolar Transistor (insulator-Gate Bipolar Transistor-IGBT) combines the advantages of a Power Transistor (Giant Transistor-GTR) and a Power field effect Transistor (Power MOSFET), has good characteristics, and has a wide application range. The modular design is adopted, the structures are the same, the interchangeability is high, the expansion performance is high, each converter 31 comprises two IGBTs and a capacitor, the half-bridge structure is formed by 2 withstand voltage 1700V IGBTs, and the IGBTs are driven to be turned on and off after PWM signals are executed to realize energy conversion.
Optionally, the battery unit forms a plurality of battery modules, and a plurality of battery modules are connected in series.
Optionally, the battery cell comprises a lithium iron phosphate battery.
Specifically, the battery unit 4 is formed by connecting lithium iron phosphate battery cells in series, and M battery modules are connected in series to form the battery unit 4, so that the battery unit 4 has no battery cells connected in parallel and no circulation phenomenon. The battery unit 4 is placed between the positive electrode and the negative electrode of the direct current side of the converter unit 3, and the total voltage of the battery unit 4 can be conveniently determined by increasing/decreasing the serial number of the battery modules so as to adapt to different voltage classes. The battery unit 4 mainly stores the electric quantity of the electric network 5, serves as an energy relay pool and can provide output electric energy to the electric network 5.
Optionally, the access unit 1 and the reactance unit 2 are electrically connected by three phases.
Referring to fig. 2, specifically, the starting circuit 12 outputs three-phase power A, B, C, the first group of inverters 31 and the first group of inverters 31 of the commutated unit are symmetrically connected to the a phase, the first group of inverters 31 and the first group of inverters 31 of the commutated unit are symmetrically connected to the B phase, and the first group of inverters 31 of the commutated unit are symmetrically connected to the C phase; when supplementing the power grid 5, each two groups of symmetrical converters 31 convert one-phase (A, B or C) voltage to the starting loop 12.
In a specific embodiment, the high-voltage energy storage system is composed of an access unit 1, a reactance unit 2, a converter unit 3 and a battery unit 4, lithium iron phosphate batteries are connected in series to form a centralized energy storage battery unit 4, a direct current bus of the battery unit 4 is connected with the converter unit 3, each phase of a converter A, B, C is provided with a left bridge arm and a right bridge arm, the left bridge arm and the right bridge arm are connected through a reactor, and each phase of alternating current is led out from a connecting point of the two reactors and is connected to the side of a power grid 5 through a starting loop 12.
The left bridge arm and the right bridge arm of each phase of A, B, C of the converter have symmetry, according to a system control strategy (adopting the existing control strategy), the bridge arms adopt a carrier phase-shifting modulation principle (adopting the existing modulation principle), the phase-shifting angles of N triangular carriers are different by pi/N, the N triangular carriers are compared with a fixed sinusoidal modulation wave (the other bridge arm adopts an inverted sine), the trigger driving signal of the IGBT of each bridge arm converter 31 of each phase is obtained, and the carrier phase-shifting modulation determines the input or the cutting of a conversion unit. The output voltage of each bridge arm at the ac side of the power grid 5 is obtained by superposition of the outputs of the N converters 31, and the output voltages of the left and right bridge arms are:
wherein: u (U) k Is AC side phase voltage, D ki For the i-th conversion unit duty cycle, V ki Is the voltage of the i-th converter 31.
The converter 31 with half of each phase of left and right bridge arms at any time is connected in series with the DC bus of the battery unit 4, and the on-time duty ratio D of the conversion unit in each carrier phase-shifting modulation period is adjusted ki The battery unit 4 can be charged/discharged to realize the exchange and transfer of energy between the ac side of the power grid 5 and the dc side of the battery unit 4, so that the ac power of the power grid 5 is converted into dc power to be stored in the battery unit 4, and the dc power stored in the battery unit 4 can be converted into ac power to be transmitted to the power grid 5/load.
The embodiment of the utility model has the following beneficial effects: the embodiment of the utility model provides a high-voltage energy storage system at the side of a power grid 5, which comprises an access unit 1, a reactance unit 2, a converter unit 3 and a battery unit 4; the access unit 1 comprises an isolating switch 11 and a starting loop 12, wherein the isolating switch 11 is used for isolating the power grid 5 from the starting loop 12, and the starting loop 12 is used for pre-charging and accessing high-voltage power of the power grid 5 into the reactance unit 2; the reactance unit 2 has a first end connected with the starting loop 12 and a second end connected with the converter unit 3, and is used for filtering switching ripple and suppressing common mode current; the converter unit 3 comprises a first bridge arm structure and a second bridge arm structure, wherein the first bridge arm structure and the second bridge arm structure are symmetrically arranged and are used for realizing free bidirectional flow of electric energy in the power grid 5 and the battery unit 4; the battery unit 4 is connected with the converter unit 3, and is used for storing electric energy of the electric network 5 or outputting electric energy to the electric network 5, and comprises a plurality of battery units connected in series. The battery cells are connected in series, so that internal circulation is effectively avoided, the capacity of the battery cell 4 can be expanded at will through the first bridge arm structure and the second bridge arm structure, and the production cost is low.
In a second aspect, an embodiment of the present utility model provides a high-voltage energy storage device on a grid side, including the high-voltage energy storage system and an equipment housing, where the high-voltage energy storage system is disposed in the equipment housing.
Therefore, the high-voltage energy storage system in the above embodiment is suitable for the embodiment of the present device, and the specific functions of the embodiment of the present device are the same as those of the embodiment of the high-voltage energy storage system, and the beneficial effects achieved by the embodiment of the present device are the same as those achieved by the embodiment of the high-voltage energy storage system.
Embodiment two:
as shown in fig. 3, the isolation switch GE1 is provided with three poles, which are respectively used for switching A, B, C phase voltages, the starting resistor is provided with three poles, each of the three poles is respectively connected with one pole of the starting switch QF2 or QF1, the starting switches QF2 or QF1 are respectively provided with three poles, A, B, C phase voltages are respectively switched, and the voltage values of the A, B, C phase voltages are respectively controlled to accurately adjust the input and output voltages, so that the influence of the phase voltages is avoided, and the internal circulation is more effectively avoided.
In the description of the present specification, reference to the term "in a particular embodiment" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While the preferred embodiment of the present utility model has been described in detail, the utility model is not limited to the embodiment, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the utility model, and these modifications and substitutions are intended to be included in the scope of the present utility model as defined in the appended claims.
Claims (10)
1. The high-voltage energy storage system at the power grid side is characterized in that the high-voltage energy storage system is directly and electrically connected with the power grid and comprises an access unit, a reactance unit, a converter unit and a battery unit;
the access unit comprises an isolating switch and a starting loop, wherein the isolating switch is used for isolating the power grid from the starting loop, and the starting loop is used for pre-charging and accessing high-voltage power of the power grid into the reactance unit;
the reactance unit is connected with the starting loop at a first end and the converter unit at a second end, and is used for filtering switching ripple waves and inhibiting common mode current;
the converter unit comprises a first bridge arm structure and a second bridge arm structure, wherein the first bridge arm structure and the second bridge arm structure are symmetrically arranged and are used for realizing free bidirectional flow of electric energy in the power grid and the battery unit;
the battery unit is connected with the current converting unit and is used for storing electric energy of the power grid or outputting electric energy to the power grid, and comprises a plurality of battery units which are connected in series.
2. The grid-side high voltage energy storage system of claim 1, wherein the isolation switch comprises a ground knife switch for isolating the startup loop from the grid.
3. The grid-side high voltage energy storage system of claim 1, wherein the startup loop comprises a startup resistor, a first startup switch, and a second startup switch, the startup resistor being electrically connected to the first startup switch and the second startup switch, respectively.
4. The grid-side high-voltage energy storage system according to claim 1, wherein the first bridge arm structure includes three sets of first converters, the first converters are provided in plurality, the plurality of first converters are connected in series with each other, and the second bridge arm structure includes three sets of second converters, the second converters are provided in plurality, and the plurality of second converters are connected in series with each other.
5. The grid-side high-voltage energy storage system according to claim 4, wherein the reactance unit comprises a plurality of reactors, one of which is connected to a set of the first converters and one of which is connected to a set of the second converters.
6. The grid-side high-voltage energy storage system according to claim 4, wherein the first inverter and the second inverter have the same structure, the first inverter or the second inverter includes a first IGBT, a second IGBT, and a capacitor, the first IGBT and the second IGBT are connected and constitute a half-bridge structure, and the capacitor is connected to the first IGBT and the second IGBT, respectively.
7. The grid-side high-voltage energy storage system according to claim 1, wherein the battery cells constitute a plurality of battery modules, and a plurality of the battery modules are connected in series with each other.
8. The grid-side high voltage energy storage system of claim 7, wherein the battery cells comprise lithium iron phosphate batteries.
9. The grid-side high-voltage energy storage system according to claim 1, characterized in that the access unit and the reactance unit are electrically connected by three phases.
10. A grid-side high-voltage energy storage device, characterized by comprising a high-voltage energy storage system according to any one of claims 1-9 and a device housing, said high-voltage energy storage system being arranged in said device housing.
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