Cooperative operation simulation system for heterogeneous energy storage units of energy storage power station

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By constructing a simulation system for the collaborative operation of heterogeneous energy storage units in energy storage power stations, the problem of inaccurate performance evaluation in traditional simulation schemes has been solved. This system enables efficient and low-cost simulation and optimized control of energy storage power stations, meeting the evaluation needs of different application scenarios.

CN223843544UActive Publication Date: 2026-01-27JIANGSU LINYANG ENERGY CO LTD +1

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Patent Information

Application Number: CN202423211180.6
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-12-25
Publication Date: 2026-01-27
Estimated Expiration: 2034-12-25

AI Technical Summary

Technical Problem

Traditional energy storage power station simulation solutions struggle to accurately simulate actual operation processes through hardware, leading to inaccurate performance evaluations. Furthermore, different application scenarios have varying focuses on key indicators, making it difficult to comprehensively assess system performance.

Method used

A collaborative operation simulation system for heterogeneous energy storage units in an energy storage power station is constructed, including low-power hardware simulation circuits for various energy storage units. Key data is acquired through sampling units and transmitted to a host computer to achieve real-time status monitoring and optimized control of the energy storage units.

Benefits of technology

It enables efficient and low-cost simulation of energy storage power stations, accurately assesses performance in complex scenarios, and provides support for design optimization and operation management.

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Abstract

The utility model provides an energy storage power station heterogeneous energy storage unit collaborative operation simulation system, which is used for simulating collaborative grid connection of various energy storage units, and comprises a first energy storage unit, a second energy storage unit, a third energy storage unit, a fourth energy storage unit and a fourth energy storage unit, wherein the first energy storage unit is composed of a battery cluster, a first bidirectional DC / AC circuit and a three-phase boosting transformer which are sequentially connected in series; the second energy storage unit is composed of a battery cluster, a second bidirectional DC / AC circuit and a single-phase boosting transformer which are sequentially connected in series; the third energy storage unit is composed of a battery cluster, a bidirectional DC / DC conversion circuit and a first bidirectional DC / AC circuit which are sequentially connected in series; the sampling units are connected with the battery clusters of the energy storage units, and are used for acquiring single cell voltage, inter-cluster current and grid-connected voltage of the energy storage units and transmitting the voltage, the current and the grid-connected voltage to an upper computer; and a user can master the working state of each heterogeneous energy storage unit and the state of the single battery cell in real time.

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Description

Technical Field

[0001] This utility model relates to the field of hardware simulation of electrochemical energy storage power stations, and in particular to a hardware implementation scheme for a heterogeneous model of an electrochemical energy storage power station. Background Technology

[0002] With the rapid development of new energy sources and the low-carbon transformation of power systems, electrochemical energy storage technology has received widespread attention as an important means to achieve power system flexibility. Electrochemical energy storage systems have advantages such as fast response, flexible installation, and short construction periods, and can be widely used in various scenarios such as peak shaving, frequency regulation, voltage support, and backup power. In these applications, the energy efficiency of the energy storage system has a significant impact on its economic efficiency and reliability.

[0003] Traditional energy storage power station grid connection schemes are mostly uniform, meaning that the power station has only one grid connection scheme. This scheme can adjust and optimize different energy storage grid connection schemes to achieve a synchronous grid connection scheme for heterogeneous energy storage units.

[0004] Furthermore, traditional simulation methods mostly rely on simulation, making it difficult to simulate the system in hardware. Therefore, simulations of actual energy storage system operation are inaccurate and fail to accurately assess system performance under complex operating conditions. Additionally, since energy storage systems involve multiple key indicators such as charge / discharge efficiency, energy loss, and system stability, different application scenarios have different focuses regarding these indicators.

[0005] Therefore, there is an urgent need for a hardware simulation method for electrochemical energy storage power stations to more comprehensively evaluate the performance of energy storage systems and guide the optimized design and operation scheduling of energy storage power stations. Utility Model Content

[0006] The purpose of this invention is to address the hardware simulation problem of electrochemical energy storage power stations by proposing a simulation system for the collaborative operation of heterogeneous energy storage units in energy storage power stations; the system platform is designed to simulate high-power scenarios in energy storage power stations using low-power hardware.

[0007] The technical solution of this utility model is:

[0008] This utility model provides a simulation system for the coordinated operation of heterogeneous energy storage units in an energy storage power station. This system is used to simulate the coordinated grid connection of multiple energy storage units, including:

[0009] The first energy storage unit includes a battery cluster, a first bidirectional DC / AC circuit, and a three-phase step-up transformer connected in series.

[0010] The second energy storage unit includes a battery cluster, a second bidirectional DC / AC circuit, and a single-phase step-up transformer connected in series.

[0011] The third energy storage unit includes a battery cluster, a bidirectional DC / DC converter circuit, and a first bidirectional DC / AC circuit connected in series.

[0012] And a sampling unit corresponding to each energy storage unit. The sampling unit is connected to the battery cluster of the energy storage unit and is used to obtain the voltage of individual cells, the inter-cluster current and the grid-connected voltage of the energy storage unit and transmit them to the host computer.

[0013] Furthermore, the first energy storage unit, the second energy storage unit, and the third energy storage unit can each be configured as one or more.

[0014] Furthermore, the sampling unit is connected to the host computer via a CAN bus.

[0015] Furthermore, the battery cluster is composed of lithium iron phosphate cells connected in series and parallel.

[0016] Furthermore, the sampling unit includes several sampling circuits connected to a single battery cell, including resistors R0-R7 and operational amplifiers U1 and U2; the positive terminal of the single battery cell is connected to one end of resistors R0, R3, and R5;

[0017] The other end of resistor R0 is connected to the series circuit of a single cell and one end of resistor R1. The other ends of resistors R1 and R3 are respectively connected to the inverting and non-inverting input terminals of operational amplifier U1. The connection point between resistor R3 and the non-inverting input terminal of operational amplifier U1 is connected in series with resistor R4 and then grounded. Resistor R2 is connected in parallel between the inverting input terminal and the output terminal of operational amplifier U1. The output terminal of operational amplifier U1 is connected to the corresponding input terminal of MCU in the sampling unit.

[0018] The other end of the resistor R5 is connected to the inverting input of the operational amplifier U2. The non-inverting input of the operational amplifier U2 is connected in series with the resistor R7 and then grounded. The inverting input and output of the operational amplifier U2 are connected in parallel with the resistor R6. The output of the operational amplifier U2 is connected to the corresponding input of the MCU in the sampling unit.

[0019] Furthermore, the first bidirectional DC / AC circuit includes capacitors C1 and C2 and IGBT transistors V1-V6. The capacitors C1 and C2 are connected in series, the IGBT transistors V1 and V2 are connected in series, V3 and V4 are connected in series, and V5 and V6 are connected in series. The series-connected capacitors and transistors are all connected in parallel across the two ends of a single battery cell. The connection points of the IGBT transistors V1 and V2, V3 and V4, and V5 and V6 are respectively connected to the corresponding phase input terminals of the three-phase step-up transformer as outputs.

[0020] Furthermore, the second bidirectional DC / AC circuit includes capacitors C3 and C4 and IGBT transistors V7-V10. The capacitors C3 and C4 are connected in series, the IGBT transistors V7 and V8 are connected in series, and V9 and V10 are connected in series. The series capacitors and transistors are all connected in parallel across the two ends of a single battery cell. The connection points of the IGBT transistors V7 and V8, and the connection points of V9 and V10 are respectively connected to the corresponding input terminals of the single-phase step-up transformer as outputs.

[0021] Further, the bidirectional DC / DC converter circuit includes a capacitor C5, IGBT transistors V11-V18, an inductor LS, and a transformer TS. IGBT transistors V11 and V12 are connected in series, V13 and V14 are connected in series, V15 and V16 are connected in series, and V17 and V18 are connected in series. The two ends of the capacitor C5 and the two ends of the series-connected transistors V11 and V12, and the two ends of V13 and V14 are all connected in parallel to the two ends of a single cell. The connection point of IGBT transistors V11 and V12 is connected in series with the inductor LS and then connected to one input terminal of the transformer TS. The connection point of IGBT transistors V13 and V14 is connected to the other input terminal of the transformer TS. The two output terminals of the transformer TS are respectively connected to the connection points of IGBT transistors V15 and V16, and the connection points of V17 and V18. The two ends of the capacitor C6 and the two ends of the series-connected transistors V15 and V16, and the two ends of V17 and V18 are all connected in parallel and serve as the output of the bidirectional DC / DC converter circuit, connected to the input terminal of the first bidirectional DC / AC circuit.

[0022] The beneficial effects of this utility model are:

[0023] The simulation system of this invention fully considers the actual operation planning of electrochemical energy storage systems, and adopts multiple low-power energy storage units for coordinated grid connection, which can simulate energy storage power stations in different scenarios; while ensuring accurate simulation, it greatly reduces hardware simulation costs and increases safety.

[0024] This utility model discloses a collaborative operation simulation system for heterogeneous energy storage units in energy storage power stations. It constructs corresponding low-power hardware simulation circuits to address the complex scenarios of energy storage power stations containing multiple heterogeneous energy storage units. By collecting key data such as individual cell voltage, inter-cluster current, and grid voltage in the simulation circuit, and transmitting the data to a host computer for analysis and processing, users can monitor the real-time operating status of each heterogeneous energy storage unit and the status of individual cells.

[0025] When this utility model is applied, the host computer can control the bidirectional DC / AC circuit and bidirectional DC / DC circuit in the simulation circuit of each heterogeneous energy storage unit to realize power conversion by controlling the switching transistor, and can flexibly simulate the charging and discharging process of the energy storage unit; it realizes low-cost and high-efficiency simulation and optimized control of complex heterogeneous energy storage power stations, and provides effective technical support for the design optimization and operation management of energy storage power stations.

[0026] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0027] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0028] Figure 1 The electrical wiring diagram of the electrochemical energy storage power station is shown.

[0029] Figure 2 A schematic diagram of a simulation system for the coordinated operation of heterogeneous energy storage units is shown.

[0030] Figure 3 A schematic diagram of the sampling circuit connected to a single battery cell is shown.

[0031] Figure 4 The schematic diagram of the first bidirectional DC / AC circuit is shown.

[0032] Figure 5 The schematic diagram of the second bidirectional DC / AC circuit is shown.

[0033] Figure 6 The schematic diagram of a bidirectional DC / DC converter circuit is shown. Detailed Implementation

[0034] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. Although preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0035] like Figure 1 , 2 As shown, this utility model provides a simulation system for the coordinated operation of heterogeneous energy storage units in an energy storage power station. This system is used to simulate the coordinated grid connection of multiple energy storage units, including:

[0036] The first energy storage unit includes a battery cluster, a first bidirectional DC / AC circuit, and a three-phase step-up transformer connected in series.

[0037] The second energy storage unit includes a battery cluster, a second bidirectional DC / AC circuit, and a single-phase step-up transformer connected in series.

[0038] The third energy storage unit includes a battery cluster, a bidirectional DC / DC converter circuit, and a first bidirectional DC / AC circuit connected in series.

[0039] And a sampling unit corresponding to each energy storage unit. The sampling unit is connected to the battery cluster of the energy storage unit and is used to obtain the voltage of individual cells, the inter-cluster current and the grid-connected voltage of the energy storage unit and transmit them to the host computer.

[0040] The first energy storage unit, the second energy storage unit, and the third energy storage unit can each be configured as one or more; the first energy storage unit is used to simulate a three-phase grid-connected 300W platform; the second energy storage unit is used to simulate a single-phase grid-connected 100W platform; and the third energy storage unit is used to simulate a three-phase grid-connected 200W platform.

[0041] The platform was designed to simulate high-power scenarios in energy storage power stations using low-power hardware. The main transformer of the energy storage power station is a 220kV three-phase dual-winding on-load tap-changing transformer. The 220kV side is connected to the off-site step-up substation, and the 35kV side is connected to the step-up transformer side of the energy storage unit.

[0042] In this embodiment, key data such as the voltage of individual energy storage cells, inter-cluster current, and grid voltage are collected in the analog circuit and transmitted to the host computer for analysis and processing by the user, so that the user can keep track of the working status of each heterogeneous energy storage unit and the status of individual cells in real time.

[0043] like Figure 3 The diagram shows the schematic of a sampling circuit connected to a single battery cell. The sampling unit includes several sampling circuits connected to a single battery cell, including resistors R0-R7 and operational amplifiers U1 and U2. The positive terminal of the single battery cell is connected to one end of resistors R0, R3, and R5.

[0044] The other end of resistor R0 is connected to the series circuit of a single cell and one end of resistor R1. The other ends of resistors R1 and R3 are respectively connected to the inverting and non-inverting input terminals of operational amplifier U1. The connection point between resistor R3 and the non-inverting input terminal of operational amplifier U1 is connected in series with resistor R4 and then grounded. Resistor R2 is connected in parallel between the inverting input terminal and the output terminal of operational amplifier U1. The output terminal of operational amplifier U1 is connected to the corresponding input terminal of MCU in the sampling unit.

[0045] The other end of the resistor R5 is connected to the inverting input of the operational amplifier U2. The non-inverting input of the operational amplifier U2 is connected in series with the resistor R7 and then grounded. The inverting input and output of the operational amplifier U2 are connected in parallel with the resistor R6. The output of the operational amplifier U2 is connected to the corresponding input of the MCU in the sampling unit.

[0046] like Figure 4 The diagram shows the schematic of the first bidirectional DC / AC circuit. The first bidirectional DC / AC circuit includes capacitors C1 and C2 and IGBT transistors V1-V6. The capacitors C1 and C2 are connected in series, the IGBT transistors V1 and V2 are connected in series, V3 and V4 are connected in series, and V5 and V6 are connected in series. The series capacitors and transistors are connected in parallel across the two ends of a single battery cell. The connection points of IGBT transistors V1 and V2, V3 and V4, and V5 and V6 are respectively connected to the corresponding phase input terminals of the three-phase step-up transformer as outputs.

[0047] like Figure 5 The diagram shown is a schematic of the second bidirectional DC / AC circuit. The second bidirectional DC / AC circuit includes capacitors C3 and C4 and IGBT transistors V7-V10. The capacitors C3 and C4 are connected in series, the IGBT transistors V7 and V8 are connected in series, and V9 and V10 are connected in series. The series capacitors and transistors are connected in parallel across the two ends of a single battery cell. The connection points of IGBT transistors V7 and V8, and V9 and V10 are respectively connected to the corresponding input terminals of the single-phase step-up transformer as outputs.

[0048] like Figure 6 The diagram shown is a schematic of a bidirectional DC / DC converter circuit. The bidirectional DC / DC converter circuit includes a capacitor C5, IGBT transistors V11-V18, an inductor LS, and a transformer TS. IGBT transistors V11 and V12 are connected in series, V13 and V14 are connected in series, V15 and V16 are connected in series, and V17 and V18 are connected in series. The two ends of capacitor C5, as well as the two ends of the series-connected transistors V11 and V12, and V13 and V14, are all connected in parallel across the two ends of a single battery cell. The IGBT transistors V11 and V18... The connection point of 12 is connected in series with inductor LS and then connected to one input terminal of transformer TS. The connection points of IGBT transistors V13 and V14 are connected to the other input terminal of transformer TS. The two output terminals of transformer TS are respectively connected to the connection points of IGBT transistors V15 and V16, and the connection points of V17 and V18. The two ends of capacitor C6, as well as the two ends of transistors V15 and V16 after series connection, and the two ends of V17 and V18 are all connected in parallel and serve as the output of bidirectional DC / DC conversion circuit, connected to the input terminal of the first bidirectional DC / AC circuit.

[0049] In this embodiment, the low-power hardware simulation circuit includes a bidirectional DC / AC circuit, a bidirectional DC / DC circuit, and a transformer. The user controls the switching transistors in the bidirectional DC / AC circuit and the bidirectional DC / DC circuit through a host computer to realize the conversion of electrical energy.

[0050] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A simulation system for collaborative operation of heterogeneous energy storage units in an energy storage power station, characterized in that, This system is used to simulate the coordinated grid connection of multiple energy storage units, including: The first energy storage unit includes a battery cluster, a first bidirectional DC / AC circuit, and a three-phase step-up transformer connected in series. The second energy storage unit includes a battery cluster, a second bidirectional DC / AC circuit, and a single-phase step-up transformer connected in series. The third energy storage unit includes a battery cluster, a bidirectional DC / DC converter circuit, and a first bidirectional DC / AC circuit connected in series. And a sampling unit corresponding to each energy storage unit. The sampling unit is connected to the battery cluster of the energy storage unit and is used to obtain the voltage of individual cells, the inter-cluster current and the grid-connected voltage of the energy storage unit and transmit them to the host computer.

2. The collaborative operation simulation system for heterogeneous energy storage units in an energy storage power station according to claim 1, characterized in that, The first energy storage unit, the second energy storage unit, and the third energy storage unit can each be configured as one or more.

3. The collaborative operation simulation system for heterogeneous energy storage units in an energy storage power station according to claim 1, characterized in that, The sampling unit is connected to the host computer via a CAN bus.

4. The collaborative operation simulation system for heterogeneous energy storage units in an energy storage power station according to claim 1, characterized in that, The battery cluster is composed of lithium iron phosphate cells connected in series and parallel.

5. The collaborative operation simulation system for heterogeneous energy storage units in an energy storage power station according to claim 1, characterized in that, The sampling unit includes several sampling circuits connected to individual battery cells, including resistors R0-R7 and operational amplifiers U1 and U2; the positive terminal of the individual battery cell is connected to one end of resistors R0, R3, and R5. The other end of resistor R0 is connected to the series circuit of a single cell and one end of resistor R1. The other ends of resistors R1 and R3 are respectively connected to the inverting and non-inverting input terminals of operational amplifier U1. The connection point between resistor R3 and the non-inverting input terminal of operational amplifier U1 is connected in series with resistor R4 and then grounded. Resistor R2 is connected in parallel between the inverting input terminal and the output terminal of operational amplifier U1. The output terminal of operational amplifier U1 is connected to the corresponding input terminal of MCU in the sampling unit. The other end of the resistor R5 is connected to the inverting input of the operational amplifier U2. The non-inverting input of the operational amplifier U2 is connected in series with the resistor R7 and then grounded. The inverting input and output of the operational amplifier U2 are connected in parallel with the resistor R6. The output of the operational amplifier U2 is connected to the corresponding input of the MCU in the sampling unit.

6. The collaborative operation simulation system for heterogeneous energy storage units in an energy storage power station according to claim 1, characterized in that, The first bidirectional DC / AC circuit includes capacitors C1 and C2 and IGBT transistors V1-V6. The capacitors C1 and C2 are connected in series, the IGBT transistors V1 and V2 are connected in series, V3 and V4 are connected in series, and V5 and V6 are connected in series. The series capacitors and transistors are all connected in parallel across the two ends of a single battery cell. The connection points of the IGBT transistors V1 and V2, V3 and V4, and V5 and V6 are respectively connected to the corresponding phase input terminals of the three-phase step-up transformer as outputs.

7. The collaborative operation simulation system for heterogeneous energy storage units in an energy storage power station according to claim 1, characterized in that, The second bidirectional DC / AC circuit includes capacitors C3 and C4 and IGBT transistors V7-V10. The capacitors C3 and C4 are connected in series, the IGBT transistors V7 and V8 are connected in series, and V9 and V10 are connected in series. The series capacitors and transistors are connected in parallel across the two ends of a single battery cell. The connection points of IGBT transistors V7 and V8, and V9 and V10 are respectively connected to the corresponding input terminals of the single-phase step-up transformer as outputs.

8. The collaborative operation simulation system for heterogeneous energy storage units in an energy storage power station according to claim 1, characterized in that, The bidirectional DC / DC converter circuit includes a capacitor C5, IGBT transistors V11-V18, an inductor LS, and a transformer TS. IGBT transistors V11 and V12 are connected in series, V13 and V14 are connected in series, V15 and V16 are connected in series, and V17 and V18 are connected in series. The two ends of the capacitor C5 and the two ends of the series-connected transistors V11 and V12, and the two ends of V13 and V14 are all connected in parallel to the two ends of a single battery cell. The connection point of IGBT transistors V11 and V12 is connected in series with the inductor LS and then connected to one input terminal of the transformer TS. The connection point of IGBT transistors V13 and V14 is connected to the other input terminal of the transformer TS. The two output terminals of the transformer TS are respectively connected to the connection points of IGBT transistors V15 and V16, and the connection points of V17 and V18. The two ends of the capacitor C6 and the two ends of the series-connected transistors V15 and V16, and the two ends of V17 and V18 are all connected in parallel and serve as the output of the bidirectional DC / DC converter circuit, connected to the input terminal of the first bidirectional DC / AC circuit.