CN216981520U - Large-scale redox flow battery energy storage system and direct current conversion device of energy storage system - Google Patents
Large-scale redox flow battery energy storage system and direct current conversion device of energy storage system Download PDFInfo
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- CN216981520U CN216981520U CN202220268393.4U CN202220268393U CN216981520U CN 216981520 U CN216981520 U CN 216981520U CN 202220268393 U CN202220268393 U CN 202220268393U CN 216981520 U CN216981520 U CN 216981520U
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Abstract
The utility model relates to a large-scale flow battery energy storage system, which comprises a plurality of flow tanks, a plurality of galvanic pile containers, a plurality of direct current conversion devices, a converter and a transformer, wherein the flow tanks are arranged on the large-scale flow battery energy storage system; each pile container comprises at least one series circuit, each series circuit is formed by connecting a plurality of single battery piles in series, each single battery pile is connected with a liquid flow tank, the output end of each series circuit is connected with a direct current conversion device, the direct current conversion device is used for direct current boosting of output voltage of the series circuit, the output ends of a plurality of direct current conversion devices are connected onto the same collecting bus in parallel, the other end of the collecting bus is connected with a converter, the output end of the converter is connected with a transformer, and the other end of the transformer is connected into a power grid. The utility model improves the direct current output voltage of the flow battery energy storage system, greatly reduces the configuration quantity of the boosting equipment, the PCS, the protection equipment and the like, simplifies the layout structure of the energy storage system, reduces the occupied area, improves the operation safety and reduces the maintenance and investment cost.
Description
Technical Field
The utility model relates to the technical field of energy storage, in particular to a large-scale flow battery energy storage system and a direct current conversion device of the energy storage system.
Background
Flow batteries are commonly used in electrochemical energy storage systems to achieve charging and discharging by a redox reaction between active ions contained in the positive electrolyte and active ions contained in the negative electrolyte. The output power of the flow battery is thousands of watts to tens of megawatts, and the energy storage capacity can reach more than hours, so that the flow battery is one of large-scale energy storage technical routes and plays a very important role.
In the current flow battery technology, a single direct current voltage of a battery stack is relatively low, and a high output voltage needs to be achieved through multi-stage boosting, so that more boosting devices need to be configured. The efficiency of the whole energy storage system is reduced due to the multi-stage boosting equipment, the cost of the input equipment is increased, and a large layout area is occupied in a large energy storage system. In large energy storage systems, higher requirements are also placed on the efficiency and safety of the system. The number of boosting stages and the number of power equipment can be reduced by adopting a group-string flow battery energy storage technology, but the direct current output voltage level of the conventional group-string flow battery energy storage system is lower, the highest output direct current voltage is 1000V, the power of a used direct current conversion device is smaller, the number of the devices to be distributed is larger, the occupied area is large, the expansibility of the whole energy storage system is poor, and the operation maintenance and investment cost of the large energy storage system are generally higher.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a large-scale flow battery energy storage system, which can improve the direct-current output voltage of the flow battery energy storage system, is beneficial to greatly reducing the configuration quantity of boosting equipment, PCS (Power control System), protective equipment and the like, simplifies the layout structure of the energy storage system, reduces the floor area, improves the operation safety of the energy storage system, and is beneficial to reducing the maintenance and investment cost.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
a large-scale flow battery energy storage system comprises a plurality of flow tanks, a plurality of pile containers, a plurality of direct current conversion devices, a converter and a transformer; each pile container comprises at least one series circuit, each series circuit is formed by connecting a plurality of single battery piles in series, each single battery pile is connected with a liquid flow tank, the output end of each series circuit is connected with a direct current conversion device, the direct current conversion device is used for direct current boosting of output voltage of the series circuit, the output ends of a plurality of direct current conversion devices are connected onto the same collecting bus in parallel, the other end of the collecting bus is connected with a converter, the output end of the converter is connected with a transformer, and the other end of the transformer is connected into a power grid.
Further, the converter and the transformer are installed outdoors, and the liquid flow tank, the pile container and the direct current conversion device are installed indoors.
Further, the liquid flow tank is arranged at the lower part of the galvanic pile container, and a liquid supply pipe between the liquid flow tank and the galvanic pile container is vertically arranged.
Further, the transformer is arranged at the lower part of the converter, and a connecting wire between the converter and the transformer is vertically arranged.
Further, the output voltage of the dc conversion device is 1500V dc voltage.
Further, two series circuits are arranged in the electric pile container.
Further, the galvanic pile container, the direct current conversion device, the current transformer, the liquid flow tank and the transformer are arranged in a partition mode, the galvanic pile container and the direct current conversion device are arranged on the upper floor of the building and located in the same area, the current transformer is arranged on the same floor of the galvanic pile container and separated from the galvanic pile container, the liquid flow tank and the transformer are arranged on the lower floor of the building, and the liquid flow tank and the transformer are arranged in a partition mode.
Further, the direct current conversion device adopts a BOOST circuit and comprises a power module, a fuse FU1 is arranged at a low-voltage input end of the direct current conversion device, a fuse FU2 is arranged at a high-voltage output end, a direct current breaker QS1 is further arranged at the low-voltage input end, a low-voltage side bus voltage supporting capacitor C is arranged between a positive electrode and a negative electrode of the low-voltage input end, one end of the low-voltage side bus voltage supporting capacitor C is connected with an inductor L1, the other end of the low-voltage side bus voltage supporting capacitor C is connected with an inductor L2, electric energy passing through the inductors L1 and the L2 is connected with the power module, and high-voltage side bus voltage supporting capacitors C1 and C2 are arranged between the positive electrode and the negative electrode of the high-voltage output end.
Further, the power module comprises four power modules T1, T2, T3 and T4, each power module is composed of two IGBT devices, an emitter of a first IGBT is connected with a collector of a second IGBT, a high-voltage end of an inductor L1 is connected with an emitter of a first IGBT in the T1, and an emitter of the first IGBT in the T1 is connected with an emitter of a first IGBT in the T2; the high-voltage end of the inductor L2 is connected with the emitter of the first IGBT in the T3, and the emitter of the first IGBT in the T3 is connected with the emitter of the first IGBT in the T4; the collector of the first IGBT in the T1 is connected with the collector of the first IGBT in the T2, the emitter of the second IGBT in the T3 is connected with the emitter of the second IGBT in the T4, and the emitter of the second IGBT in the T1 is connected with the emitter of the second IGBT in the T2, the collector of the first IGBT in the T3 and the collector of the first IGBT in the T4 respectively; one end of a high-side bus voltage support capacitor C1 is connected with the collector of the first IGBT in T2, the other end of the high-side bus voltage support capacitor C1 is connected with one end of the high-side bus voltage support capacitor C2 and the collector of the first IGBT in T4, and the other end of the high-side bus voltage support capacitor C2 is connected with the emitter of the second IGBT in T4.
The utility model also discloses a direct current conversion device of the large-scale flow battery energy storage system.
The utility model adds a direct current conversion device for adjusting output voltage in the existing flow battery energy storage system, the direct current conversion device is used as a flexible interface between the flow battery pack and the converter, the output voltage of each pile container can be uniformly increased to 1500V, the problem that the output voltage of each pile container is different due to the specification difference and the type difference of batteries produced by different manufacturers is solved, and the adaptability of grouping and mixing the batteries with different capacities in a large energy storage system is widened. Compared with the existing energy storage system, the output direct-current voltage of the flow battery is improved, the configuration quantity of boosting equipment, PCS (Power control System), protective equipment and the like can be greatly reduced for the arrangement of a large-scale energy storage system, the arrangement structure of the energy storage system is simplified, the occupied area is reduced, the equipment in the whole energy storage system is arranged in a functional partition mode, the maintenance and input cost is reduced, and the operation safety of the energy storage system is also improved.
Drawings
FIG. 1 is a schematic layout diagram of a large-scale flow battery energy storage system in an embodiment;
FIG. 2 is a schematic diagram of an electrical system of a 100MW energy storage power station;
FIG. 3 is an expansion shaft side schematic view of a large-scale flow battery energy storage system in an embodiment;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a side view of FIG. 3;
FIG. 6 is a main circuit topology diagram of a DC conversion device in the large-scale flow battery energy storage system according to the utility model;
fig. 7 is a main circuit application topological diagram of a direct current conversion device in the large-scale flow battery energy storage system.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The embodiment discloses a large-scale flow battery energy storage system and further discloses a direct current conversion device for the large-scale flow battery energy storage system. Compared with the existing large-scale flow battery energy storage system, the large-scale flow battery energy storage system disclosed by the embodiment uniformly improves the existing 1000V direct-current voltage to 1500V through the direct-current conversion device arranged at the output end of the battery stack group, optimizes the electrical configuration and arrangement of the large-scale flow battery energy storage power station, reduces the number of 60% of devices such as current conversion and voltage boosting of the energy storage power station, simplifies the building structure and site arrangement, and further reduces the construction cost and operation and maintenance cost of the energy storage power station. The direct current conversion device arranged in the embodiment unifies the output consistency of different flow batteries, and lays a technical foundation for hybrid energy storage power stations with different battery types and different battery capacities.
Referring to fig. 1 to 5, the large-scale flow battery energy storage system of the present embodiment includes a plurality of flow tanks 101, a plurality of stack containers 102, a plurality of dc converters 103, a converter 104 (i.e., PCS), and a 35KV transformer 105. Each stack container 102 includes at least one series circuit (two series circuits are provided in the single stack container 102 shown in fig. 1, and the series design can be performed according to the scale of the energy storage system), each series circuit is formed by connecting a plurality of single cell stacks in series, each single cell stack is connected with one flow tank 101, and the output end of each series circuit is connected with a dc conversion device 103. The dc converter 103 and the stack container 102 can be regarded as a standard stack module, and the output voltage of the combined standard stack module is 1500V, which provides convenience and flexibility for the layout and connection of the whole energy storage system. The dc conversion device 103 in this embodiment is used for dc boosting of the output voltage of each series circuit, the output terminals of the dc conversion devices on the plurality of stack containers 102 are connected in parallel to the same collecting bus, the other end of the collecting bus is connected to the converter 104, the output terminal of the converter 104 is connected to the transformer 105, and the other end of the transformer 105 is connected to the grid.
In designing the layout of each device in the energy storage system, the converter 104 and the transformer 105 are installed outdoors, and the flow tank 101, the stack container 102, and the dc converter 103 are installed indoors, in consideration of the requirements of heat dissipation of the device, safety of operation, convenience of maintenance, reduction in cost, and the like. The converter 104 and the transformer 105 generally meet the use requirements of outdoor environments, and are arranged outdoors, so that the outdoor heat dissipation is more favorable due to the high power and high heat generation, and the mutual influence of all devices in the system can be reduced by separating the converter from other devices, thereby being favorable for maintenance and reducing the construction cost. Other equipment is arranged indoors, the requirement of working environment temperature is mainly considered, and the indoor safe and reliable operation condition is better met.
When wiring of each device in the energy storage system is designed, functional partitioning is performed by using a multi-story building structure, the pile container 102 and the dc conversion device 103 are arranged on the upper floor of the building and located in the same area, and the converter 104 is arranged on the same floor of the pile container 102 and is separated from the pile container 102 indoors and outdoors. The liquid flow tank 101 and the transformer 105 are arranged on the lower floor of a building, the liquid flow tank 101 is positioned right below the pile container 102, the transformer 105 is positioned right below the converter 104, and the liquid flow tank 101 and the transformer 105 are arranged in a manner of being separated from each other indoors and outdoors. According to the layout, the liquid supply pipe between the liquid flow tank 101 and the pile container 102 can be kept vertical, so that the circulation of electrolyte is facilitated, and the vertical routing is also beneficial to reducing the cost. The stacks in the stack container 102 are directly connected to the dc conversion device 103 through the bus bars, which saves cables. The transformer 104 and the transformer 105 are vertically wired, the load bearing and construction requirements are mainly considered, the transformer 105 is arranged on the lower floor, the corresponding cost can be reduced from the bearing, alternating current grid connection, carrying construction and other aspects, and the positions can be properly adjusted according to different requirements, for example, the transformer 105 and the transformer 104 can be arranged on the same floor. The partition is isolated from each other through the building, so that the requirement of electric and oil-fire separation fire prevention is met, and the operation and maintenance of different functional areas are facilitated.
The energy storage system scheme adaptability that this embodiment provided is wide, is fit for the redox flow battery of different capacity and uses in groups, also is fit for other battery demand scenes in groups such as lithium electricity. Meanwhile, the application of the 1500Vdc system is considered. Taking the 100MW energy storage power station shown in fig. 2 as an example, 16 35kV energy storage step-up transformers and 4 35kV station transformers can be used, 2 25MW energy storage units can be connected in parallel with 1 current collection bus, and two current collection buses constitute a 100MW energy storage system and are connected to the 35kV side of the power station step-up transformer. In the DC/DC 1500V direct current converter embedding pile module, arrange indoor with liquid flow jar, pile module, direct current 1500V generating line, PCS, transformer, the 35kV distribution device that converges arranges in outdoor, exchange, the partial subregion of direct current is reasonable, arranges succinctly, inseparable, reduces and takes up an area of, makes things convenient for follow-up power station operation and maintenance management work to develop very much.
The dc conversion device 103 mentioned in the above scheme is formed by a BOOST circuit, as shown in fig. 6 and 7, the BOOST circuit includes: the power module, the direct current switch, the EMI filter, the control device and the like adopt the design of high-reliability intelligent power module development and integration of charging and discharging to realize the bidirectional energy flow of a direct current system. The circuit of the dc converter 103 is specifically described as follows: the power module comprises a power module consisting of four power modules T1, T2, T3 and T4, wherein each power module consists of two IGBT devices (namely a first IGBT and a second IGBT), and an emitter of the first IGBT is connected with a collector of the second IGBT. The power module is selected by considering the serial and parallel structures of the flow battery modules of various manufacturers and considering two dimensionalities of reducing the cost of the device. The low voltage input end of the direct current conversion device is provided with a fuse FU1, the high voltage output end is provided with a fuse FU2, the fuse is used for overcurrent protection, and the protection effect can be timely played when short-circuit current occurs in the system. The low-voltage input end is also provided with a direct current breaker QS1, and QS1 is used for overcurrent protection of the direct current conversion device. A low-voltage side bus voltage supporting capacitor C is arranged between the positive electrode and the negative electrode of the low-voltage input end, one end of the low-voltage side bus voltage supporting capacitor C is connected with an inductor L1, the other end of the low-voltage side bus voltage supporting capacitor C is connected with an inductor L2, electric energy passing through the inductors L1 and L2 is connected with a power module, and a high-voltage side bus voltage supporting capacitor C1 and a high-voltage side bus voltage supporting capacitor C2 are arranged between the positive electrode and the negative electrode of the high-voltage output end.
Further, the high-voltage end of the inductor L1 is connected with the emitter of the first IGBT in the T1, and the emitter of the first IGBT in the T1 is connected with the emitter of the first IGBT in the T2; the high-voltage end of the inductor L2 is connected with the emitter of the first IGBT in the T3, and the emitter of the first IGBT in the T3 is connected with the emitter of the first IGBT in the T4; the collector of the first IGBT in the T1 is connected with the collector of the first IGBT in the T2, the emitter of the second IGBT in the T3 is connected with the emitter of the second IGBT in the T4, and the emitter of the second IGBT in the T1 is connected with the emitter of the second IGBT in the T2, the collector of the first IGBT in the T3 and the collector of the first IGBT in the T4 respectively; one end of a high-side bus voltage support capacitor C1 is connected with the collector of the first IGBT in T2, the other end of the high-side bus voltage support capacitor C1 is connected with one end of the high-side bus voltage support capacitor C2 and the collector of the first IGBT in T4, and the other end of the high-side bus voltage support capacitor C2 is connected with the emitter of the second IGBT in T4.
In the scheme, the supporting capacitor is mainly used for smoothing and filtering the output voltage of the rectifier, absorbing high-amplitude pulsating current which is required from the inverter to the DC-Link and preventing the high-amplitude pulsating current from generating high-amplitude pulsating voltage on the impedance of the DC-Link, so that the voltage fluctuation on the direct current bus is kept within an allowable range. The voltage overshoot from the DC-Link and the influence of the transient overvoltage on the IGBT are prevented. The inductance plays the effect of energy storage, step-down, and the electric capacity plays the effect of steady voltage, switches on or shuts off through IGBT, for the inductance carries out charge-discharge, realizes stepping up and down the voltage.
Input voltage of the dc conversion device 103: considering the difference of the dc voltage ranges of different manufacturers of the flow battery and the output voltage range of the lithium ion battery, the input voltage range of the dc conversion device 103 is 400V-850 Vdc. Output voltage of dc converter 103: the input voltage requirement of other mainstream PCS products can be met after 1500Vdc is met or the input voltage requirement is met according to 1500V PCS products. The direct current conversion device 103 is a flexible interface of the flow battery pack and the energy storage converter PCS, and realizes the functions of charging, discharging, frequency modulation, voltage regulation, black start and the like of the power station through the PCS, the BMS and the DCDC according to the command of an energy storage power station EMS system.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A large-scale redox flow battery energy storage system is characterized in that: the system comprises a plurality of liquid flow tanks, a plurality of electric pile containers, a plurality of direct current conversion devices, a converter and a transformer; each pile container comprises at least one series circuit, each series circuit is formed by connecting a plurality of single battery piles in series, each single battery pile is connected with a liquid flow tank, the output end of each series circuit is connected with a direct current conversion device, the direct current conversion device is used for direct current boosting of output voltage of the series circuit, the output ends of a plurality of direct current conversion devices are connected onto the same collecting bus in parallel, the other end of the collecting bus is connected with a converter, the output end of the converter is connected with a transformer, and the other end of the transformer is connected into a power grid.
2. The large-scale flow battery energy storage system according to claim 1, characterized in that: the converter and the transformer are installed outdoors, and the liquid flow tank, the galvanic pile container and the direct current conversion device are installed indoors.
3. The large-scale flow battery energy storage system according to claim 2, wherein: the liquid flow tank is arranged at the lower part of the galvanic pile container, and a liquid supply pipe between the liquid flow tank and the galvanic pile container is vertically arranged.
4. The large-scale flow battery energy storage system of claim 2, wherein: the transformer is arranged at the lower part of the converter, and a connecting wire between the converter and the transformer is vertically arranged.
5. The large-scale flow battery energy storage system according to claim 1, characterized in that: the output voltage of the direct current conversion device is 1500V direct current voltage.
6. The large-scale flow battery energy storage system of claim 1, wherein: two series circuits are arranged in the electric pile container.
7. The large-scale flow battery energy storage system according to any one of claims 2-4, wherein: the galvanic pile container, the direct current conversion device, the converter, the liquid flow tank and the transformer are arranged in a partitioned mode, the galvanic pile container and the direct current conversion device are arranged on the upper floor of a building and located in the same area, the converter is arranged on the same floor of the galvanic pile container and separated from the galvanic pile container, the liquid flow tank and the transformer are arranged on the lower floor of the building, and the liquid flow tank and the transformer are arranged in a partitioned mode.
8. The large-scale flow battery energy storage system of claim 1, wherein: the direct current conversion device adopts a BOOST circuit and comprises a power module, a fuse FU1 is arranged at a low-voltage input end of the direct current conversion device, a fuse FU2 is arranged at a high-voltage output end, a direct current breaker QS1 is further arranged at the low-voltage input end, a low-voltage side bus voltage supporting capacitor C is arranged between a positive electrode and a negative electrode of the low-voltage input end, one end of the low-voltage side bus voltage supporting capacitor C is connected with an inductor L1, the other end of the low-voltage side bus voltage supporting capacitor C is connected with an inductor L2, electric energy passing through the inductors L1 and the L2 is connected with the power module, and high-voltage side bus voltage supporting capacitors C1 and C2 are arranged between the positive electrode and the negative electrode of the high-voltage output end.
9. The large-scale flow battery energy storage system of claim 8, wherein: the power module comprises four power modules T1, T2, T3 and T4, wherein each power module is composed of two IGBT devices, an emitter of a first IGBT is connected with a collector of a second IGBT, a high-voltage end of an inductor L1 is connected with an emitter of the first IGBT in T1, and an emitter of the first IGBT in T1 is connected with an emitter of a first IGBT in T2; the high-voltage end of the inductor L2 is connected with the emitter of the first IGBT in the T3, and the emitter of the first IGBT in the T3 is connected with the emitter of the first IGBT in the T4; the collector of the first IGBT in the T1 is connected with the collector of the first IGBT in the T2, the emitter of the second IGBT in the T3 is connected with the emitter of the second IGBT in the T4, and the emitter of the second IGBT in the T1 is connected with the emitter of the second IGBT in the T2, the collector of the first IGBT in the T3 and the collector of the first IGBT in the T4 respectively; one end of a high-side bus voltage support capacitor C1 is connected with the collector of the first IGBT in T2, the other end of the high-side bus voltage support capacitor C1 is connected with one end of the high-side bus voltage support capacitor C2 and the collector of the first IGBT in T4, and the other end of the high-side bus voltage support capacitor C2 is connected with the emitter of the second IGBT in T4.
10. A direct current conversion device of an energy storage system comprises a power module consisting of four power modules T1, T2, T3 and T4, wherein a fuse FU1 is arranged at a low-voltage input end of the direct current conversion device, a fuse FU2 is arranged at a high-voltage output end of the direct current conversion device, a direct current breaker QS1 is further arranged at the low-voltage input end, a low-voltage side bus voltage supporting capacitor C is arranged between a positive pole and a negative pole of the low-voltage input end, one end of the low-voltage side bus voltage supporting capacitor C is connected with an inductor L1, the other end of the low-voltage side bus voltage supporting capacitor C is connected with an inductor L2, and high-voltage side bus voltage supporting capacitors C1 and C2 are arranged between the positive pole and the negative pole of the high-voltage output end;
each power module is composed of two IGBT devices, an emitter electrode of a first IGBT is connected with a collector electrode of a second IGBT, a high-voltage end of an inductor L1 is connected with an emitter electrode of a first IGBT in T1, and an emitter electrode of the first IGBT in T1 is connected with an emitter electrode of a first IGBT in T2; the high-voltage end of the inductor L2 is connected with the emitter of the first IGBT in the T3, and the emitter of the first IGBT in the T3 is connected with the emitter of the first IGBT in the T4; the collector of the first IGBT in the T1 is connected with the collector of the first IGBT in the T2, the emitter of the second IGBT in the T3 is connected with the emitter of the second IGBT in the T4, and the emitter of the second IGBT in the T1 is connected with the emitter of the second IGBT in the T2, the collector of the first IGBT in the T3 and the collector of the first IGBT in the T4 respectively; one end of a high-side bus voltage support capacitor C1 is connected with the collector of the first IGBT in the T2, the other end of the high-side bus voltage support capacitor C1 is respectively connected with one end of the high-side bus voltage support capacitor C2 and the collector of the first IGBT in the T4, and the other end of the high-side bus voltage support capacitor C2 is connected with the emitter of the second IGBT in the T4.
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