Double-loop control system of high-voltage energy storage system

Abstract

The embodiment of the invention provides a double-loop control system of a high-voltage energy storage system. The double-loop control system comprises a first high-voltage loop, a first low-voltage module, a second high-voltage loop and a second low-voltage module, the first high-voltage loop is used for being connected with a first battery cluster and a first energy storage converter and controlling connection and disconnection between the first battery cluster and the first energy storage converter. The second high-voltage loop is used for respectively connecting a second battery cluster and a second energy storage converter and controlling the connection and disconnection between the second battery cluster and the second energy storage converter; the first low-voltage module is electrically connected with the first high-voltage loop and is used for controlling the first high-voltage loop; the second low-voltage module is electrically connected with the first high-voltage loop and is used for controlling the second high-voltage loop; the first low-voltage module and the second low-voltage module are electrically connected with each other and are electrically connected with a battery management system. Two groups of high-voltage and low-voltage devices are integrated to meet simultaneous access of two groups of battery clusters, and the stability of the energy storage system is improved.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of high-voltage energy storage systems, and specifically relate to a dual-circuit control system of a high-voltage energy storage system. Background Art

[0002] The high-voltage box of the energy storage system is the core component of the energy storage system. It plays an important role in the energy storage system, including over-current and over-voltage protection of the battery pack, electrical isolation and insulation, energy management and control, etc. It can improve the reliability of the system operation and facilitate maintenance and management.

[0003] In current high-voltage energy storage systems, most are designed so that each battery cluster corresponds to a loop control system in a high-voltage box, and each high-voltage box controls the charge and discharge of its battery cluster. However, when a battery cluster or loop fails, the power supply will be interrupted because there is no backup battery cluster or other power supply loop. Summary of the invention

[0004] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art, and provide a dual-circuit control system for a high-voltage energy storage system, the control system comprising a first high-voltage circuit, a first low-voltage module, a second high-voltage circuit, and a second low-voltage module;

[0005] The first high-voltage circuit is used to connect the first battery cluster and the first energy storage converter respectively, and control the on-off between the first battery cluster and the first energy storage converter; the second high-voltage circuit is used to connect the second battery cluster and the second energy storage converter respectively, and control the on-off between the second battery cluster and the second energy storage converter;

[0006] The first low-voltage module is electrically connected to the first high-voltage circuit and is used to control the first high-voltage circuit; the second low-voltage module is electrically connected to the first high-voltage circuit and is used to control the second high-voltage circuit;

[0007] The first low-voltage module and the second low-voltage module are electrically connected to each other and are respectively electrically connected to a battery management system.

[0008] Furthermore, the first high-voltage circuit includes a first positive branch and a first negative branch; the second high-voltage circuit includes a second positive branch and a second negative branch;

[0009] The first positive electrode branch is respectively connected to the positive electrode of the first battery cluster and the positive electrode of the first energy storage converter; the second positive electrode branch is respectively connected to the positive electrode of the second battery cluster and the positive electrode of the second energy storage converter;

[0010] The first negative electrode branch is respectively connected to the negative electrode of the first battery cluster and the negative electrode of the first energy storage converter; the second negative electrode branch is respectively connected to the negative electrode of the second battery cluster and the negative electrode of the second energy storage converter.

[0011] Further, the first positive branch and the first negative branch are connected in series with a first DC circuit breaker;

[0012] The second positive branch and the second negative branch are connected in series with a second DC circuit breaker.

[0013] Further, the first low-voltage module includes a first isolation feedback submodule, and the second low-voltage module includes a second isolation feedback submodule;

[0014] The first isolation feedback submodule is electrically connected to the first DC circuit breaker and is used to monitor the opening and closing status of the first DC circuit breaker;

[0015] The second isolation feedback submodule is electrically connected to the second DC circuit breaker and is used to monitor the opening and closing status of the second DC circuit breaker.

[0016] Optionally, the first negative electrode branch is connected in series with a first shunt, and the second negative electrode branch is connected in series with a second shunt;

[0017] The first low-voltage module includes a first shunt sampling submodule electrically connected to the first shunt, for monitoring the current of the first negative branch; the second low-voltage module includes a second shunt sampling submodule electrically connected to the second shunt, for monitoring the current of the second negative branch.

[0018] Optionally, the first positive branch is connected in series with a first fuse, and the second positive branch is connected in series with a second fuse;

[0019] The first low-voltage module includes a first fuse feedback submodule for monitoring the state of the first fuse; the second low-voltage module includes a second fuse feedback submodule for monitoring the state of the second fuse.

[0020] Further, the first positive branch is connected in series with a first positive contactor, and the first negative branch is connected in series with a first negative contactor; the second positive branch is connected in series with a second positive contactor, and the second negative branch is connected in series with a second negative contactor;

[0021] The first low-voltage module includes a first positive contactor coil drive feedback submodule and a first negative contactor coil drive feedback submodule; the second low-voltage module includes a second positive contactor coil drive feedback submodule and a second negative contactor coil drive feedback submodule;

[0022] The first positive contactor coil drive feedback submodule is electrically connected to the first positive contactor for controlling and monitoring the first positive contactor; the first negative contactor coil drive feedback submodule is electrically connected to the first negative contactor for controlling and monitoring the first negative contactor; the second positive contactor coil drive feedback submodule is electrically connected to the second positive contactor for controlling and monitoring the second positive contactor; the second negative contactor coil drive feedback submodule is electrically connected to the second negative contactor for controlling and monitoring the second negative contactor.

[0023] Optionally, the first positive contactor is connected in parallel with a first pre-charging resistor, which is connected in series with the first pre-charging contactor; the second positive contactor is connected in parallel with a second pre-charging resistor, which is connected in series with the second pre-charging contactor;

[0024] The first low-voltage module includes a first pre-charge contactor coil driving submodule, and the second low-voltage module includes a second pre-charge contactor coil driving submodule;

[0025] The first pre-charging contactor coil driving submodule is electrically connected to the first pre-charging contactor for driving the first pre-charging contactor; the second pre-charging contactor coil driving submodule is electrically connected to the second pre-charging contactor for driving the second pre-charging contactor.

[0026] Further, the first low-voltage module includes a first main control system power supply submodule, and the second low-voltage module includes a second main control system power supply submodule;

[0027] The first main control system power supply submodule and the second main control system power supply submodule are respectively powered by the battery management system, and are used to supply power to the first low-voltage module and the second low-voltage module respectively.

[0028] Further, the first low-voltage module includes an address allocation output module, and the second low-voltage module includes an address allocation input module;

[0029] The address allocation output module is electrically connected to the address allocation input module.

[0030] A dual-circuit control system of a high-voltage energy storage system in an embodiment of the present disclosure can meet the needs of simultaneous access of two battery clusters by integrating two groups of high and low voltage devices, and simultaneously control and manage the charging and discharging of the two battery clusters, thereby avoiding power supply interruptions caused by single circuit failures and improving the operating stability of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention is a schematic structural diagram of a dual-circuit control system of a high-voltage energy storage system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0033] In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.

[0034] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0035] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another component. Therefore, the first component discussed below can be referred to as the second component without departing from the teachings of the concepts of the present disclosure. As used in this disclosure, the term "and / or" includes any one of the associated listed items and all combinations of one or more.

[0036] Those skilled in the art will appreciate that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present disclosure, and therefore cannot be used to limit the protection scope of the present disclosure.

[0037] like Figure 1As shown, an embodiment of the present disclosure provides a high-voltage energy storage system dual-circuit control system, including a high-voltage part and a low-voltage part. The high-voltage part includes a first high-voltage circuit L1 and a second high-voltage circuit L2, and the low-voltage part includes a first low-voltage module M1 and a second low-voltage module M2. The first high-voltage circuit L1 is used to connect the first battery cluster BAT1 and the first energy storage converter PCS1 respectively, and control the on-off between the first battery cluster BAT1 and the first energy storage converter PCS1. The second high-voltage circuit L2 is used to connect the second battery cluster BAT2 and the second energy storage converter PCS2 respectively, and control the on-off between the second battery cluster BAT2 and the second energy storage converter PCS2. The first low-voltage module M1 is electrically connected to the first high-voltage circuit L1 to control the first high-voltage circuit L1. The second low-voltage module M2 is electrically connected to the second high-voltage circuit L2 to control the second high-voltage circuit L2. The first low-voltage module M1 and the second low-voltage module M2 are electrically connected to each other, and are electrically connected to the battery management system BMS respectively.

[0038] Specifically, the high-voltage part mainly includes DC circuit breakers, contactors, fuses, pre-charging resistors, and shunts. Its main function is to connect multiple battery boxes in series into a battery cluster and connect them to the high-voltage box. The high-voltage devices in the high-voltage box control and manage the charging and discharging circuits of the battery cluster, and protect the batteries when abnormal conditions occur in the battery cluster.

[0039] The first high-voltage circuit L1 includes a first positive branch L1+ and a first negative branch L1-; similarly, the second high-voltage circuit L2 includes a second positive branch L2+ and a second negative branch L2-. The first positive branch L1+ is respectively connected to the positive electrode of the first battery cluster BAT1 and the positive electrode of the first energy storage converter PCS1; the second positive branch L2+ is respectively connected to the positive electrode of the second battery cluster BAT2 and the positive electrode of the second energy storage converter PCS2. The first negative branch L1- is respectively connected to the negative electrode of the first battery cluster BAT1 and the negative electrode of the first energy storage converter PCS1; the second negative branch L2- is respectively connected to the negative electrode of the second battery cluster BAT2 and the negative electrode of the second energy storage converter PCS2.

[0040] The first positive branch L1+ and the first negative branch L1- are connected in series with a first DC circuit breaker QS1; the second positive branch L2+ and the second negative branch L2- are connected in series with a second DC circuit breaker QS2. The first high-voltage circuit L1 implements on-off control between the first battery cluster BAT1 and the first energy storage converter PCS1 through the first DC circuit breaker QS1, and the second high-voltage circuit L2 implements on-off control between the second battery cluster BAT2 and the second energy storage converter PCS1 through the second DC circuit breaker QS2.

[0041] The first negative electrode branch L1- is connected in series with a first shunt FL1, and the second negative electrode branch L2- is connected in series with a second shunt FL2, which are respectively used to collect the DC current of the first high-voltage circuit L1 and the second high-voltage circuit L2.

[0042] The first positive branch L1+ is connected in series with a first fuse FU1, and the second positive branch L2+ is connected in series with a second fuse FU2. When a short circuit or other fault occurs in the high-voltage circuit, resulting in excessive current and excessive temperature, the fuse blows to cut off the corresponding circuit and protect other components in the circuit.

[0043] The first positive branch L1+ is connected in series with a first positive contactor KM1+, and the first negative branch L1- is connected in series with a first negative contactor KM1-. ​​The second positive branch L2+ is connected in series with a second positive contactor KM2+, and the second negative branch L1- is connected in series with a second negative contactor KM2-. The contactor can be opened and closed by electromagnetic, pneumatic or hydraulic principles, thereby controlling the on and off of the corresponding branch.

[0044] The first positive contactor KM1+ is connected in parallel with a first pre-charging resistor R1, which is connected in series with a first pre-charging contactor KM-R1; the second positive contactor KM2+ is connected in parallel with a second pre-charging resistor R2, which is connected in series with a second pre-charging contactor KM-R2. The pre-charging resistor controls the current through its resistance value, preventing excessive current from directly impacting the battery or other high-voltage electrical components, allowing the battery to charge slowly, thereby avoiding capacitor damage and system instability caused by transient faults.

[0045] The low-voltage part mainly uses a battery control unit (BCMU, Battery cluster management unit) to control the above-mentioned high-voltage part devices such as circuit breakers, contactors, etc., and monitor the working status of the battery cluster. When an abnormal situation occurs in the battery cluster, a protection instruction is issued to control related high-voltage devices to protect the battery cluster. The battery control unit is the first low-voltage module M1 and the second low-voltage module M2 of this embodiment.

[0046] The first low-voltage module M1 includes a first isolation feedback submodule M1-1, and the second low-voltage module M2 includes a second isolation feedback submodule M2-1. The first isolation feedback submodule M1-1 is electrically connected to the first DC circuit breaker QS1, and is used to monitor the opening and closing status of the first DC circuit breaker QS1. In a specific implementation method, a single-open double-control switch K1 can be set to be linked with the first DC circuit breaker QS1. When its moving end contact 1 is connected to contact 2, the first isolation feedback submodule M1-1 obtains an electrical signal, and when its moving end contact 1 is connected to contact 3, it is suspended, so that the first isolation feedback submodule M1-1 can detect the opening and closing state of the circuit breaker. Based on the same principle, the second isolation feedback submodule M2-1 is electrically connected to the second DC circuit breaker QS2, and is used to monitor the opening and closing status of the second DC circuit breaker QS2.

[0047] The first low-voltage module M1 includes a first shunt sampling submodule M1-2 electrically connected to the first shunt FL1, for monitoring the current of the first negative branch L1-; the second low-voltage module M2 includes a second shunt sampling submodule M2-2 electrically connected to the second shunt FL2, for monitoring the current of the second negative branch L2-.

[0048] The first low-voltage module M1 includes a first fuse feedback submodule M1-3 for monitoring the state of the first fuse FU1; the second low-voltage module M2 includes a second fuse feedback submodule M2-3 for monitoring the state of the second fuse FU2. By setting a normally closed switch K2 linked to the fuse, the fuse feedback submodule can determine whether the fuse has been blown by the opening and closing state of the normally closed switch K2.

[0049] The first low-voltage module M1 includes a first positive contactor coil drive feedback submodule M1-4 and a first negative contactor coil drive feedback submodule M1-5; the second low-voltage module M2 includes a second positive contactor coil drive feedback submodule M2-4 and a second negative contactor coil drive feedback submodule M2-5. The first positive contactor coil drive feedback submodule M1-4 is electrically connected to the first positive contactor KM1+, for controlling and monitoring the first positive contactor KM1+; the first negative contactor coil drive feedback submodule M1-5 is electrically connected to the first negative contactor KM1-, for controlling and monitoring the first negative contactor KM1-; the second positive contactor coil drive feedback submodule M2-4 is electrically connected to the second positive contactor KM2+, for controlling and monitoring the second positive contactor KM2+; the second negative contactor coil drive feedback submodule M2-5 is electrically connected to the second negative contactor KM2-, for controlling and monitoring the second negative contactor KM2-. Specifically, an electromagnetic drive switch K and a drive coil L linked to the above-mentioned contactors can be set, and both ends of the electromagnetic drive switch K and the drive coil L are connected to the corresponding contactor coil drive feedback submodule. The contactor coil drive feedback submodule drives the switch K through the coil L, thereby controlling the opening and closing of each contactor, and at the same time, the opening and closing state of the contactor is detected by the opening and closing state of the electromagnetic drive switch K.

[0050] The first low-voltage module M1 includes a first pre-filling contactor coil driving submodule M1-6, and the second low-voltage module M2 includes a second pre-filling contactor coil driving submodule M2-6. The first pre-filling contactor coil driving submodule M1-6 is electrically connected to the first pre-filling contactor KM-R1, and is used to drive the first pre-filling contactor KM-R1; the second pre-filling contactor coil driving submodule M2-6 is electrically connected to the second pre-filling contactor KM-R2, and is used to drive the second pre-filling contactor KM-R2. Specifically, a drive coil L can be set, and its two ends are connected to the pre-filling contactor coil driving submodule, so that the pre-filling contactor coil driving submodule controls the opening and closing of the pre-filling contactor through the drive coil L, so that the branch where the pre-filling resistor R1 or R2 is located is turned on or off.

[0051] The first low-voltage module M1 and the second low-voltage module M2 are electrically connected to each other. Specifically, the first low-voltage module M1 includes an address allocation output module M1-7, and the second low-voltage module M2 includes an address allocation input module M2-7. The address allocation output module M1-7 is electrically connected to the address allocation input module M2-7. The address allocation output and input submodules provide a unique address identifier for the low-voltage module, ensuring the independence of each low-voltage module in the communication network, enabling the system to accurately distinguish and control each low-voltage module, and avoiding data confusion and misoperation. By electrically connecting the address allocation output module M1-7 and the address allocation input module M2-7 to exchange information, the system can efficiently communicate with each low-voltage module, and sending control instructions helps to improve the response speed and stability of the entire battery management system BMS.

[0052] The first low-voltage module M1 and the second low-voltage module M2 are electrically connected to the battery management system BMS, respectively. Specifically, the first low-voltage module M1 includes a first main control system power supply submodule M1-8, and the second low-voltage module M2 includes a second main control system power supply submodule M2-8. The first main control system power supply submodule M1-8 and the second main control system power supply submodule M2-8 are powered by the battery management system BMS, respectively, and are used to supply power to the first low-voltage module M1 and the second low-voltage module M2, respectively.

[0053] A dual-circuit control system for a high-voltage energy storage system in an embodiment of the present disclosure can satisfy the simultaneous access of two battery clusters by integrating two groups of high and low voltage devices, and can control and manage the charging and discharging of the two battery clusters at the same time. The control circuits of the two groups of high and low voltage devices are independent of each other. When a battery cluster fails, a single faulty battery cluster can be cut off without affecting the operation of other battery clusters, thereby achieving precise switching. The two groups of high and low voltage devices can be used as one main and one backup. When one of the circuits fails, the other circuit can immediately take over the power supply task as a redundant design, thereby avoiding power supply interruptions caused by single circuit failures and improving the operating stability of the energy storage system.

[0054] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A dual-circuit control system for a high-voltage energy storage system, characterized in that: The control system includes a first high-pressure circuit, a first low-pressure module, a second high-pressure circuit, and a second low-pressure module; The first high-voltage circuit is used to connect the first battery cluster and the first energy storage converter respectively, and control the on-off between the first battery cluster and the first energy storage converter; the second high-voltage circuit is used to connect the second battery cluster and the second energy storage converter respectively, and control the on-off between the second battery cluster and the second energy storage converter; The first low-voltage module is electrically connected to the first high-voltage circuit and is used to control the first high-voltage circuit; the second low-voltage module is electrically connected to the first high-voltage circuit and is used to control the second high-voltage circuit; The first low-voltage module and the second low-voltage module are electrically connected to each other and are respectively electrically connected to a battery management system.

2. The control system according to claim 1, characterized in that: The first high-voltage circuit includes a first positive branch and a first negative branch; the second high-voltage circuit includes a second positive branch and a second negative branch; The first positive electrode branch is respectively connected to the positive electrode of the first battery cluster and the positive electrode of the first energy storage converter; the second positive electrode branch is respectively connected to the positive electrode of the second battery cluster and the positive electrode of the second energy storage converter; The first negative electrode branch is respectively connected to the negative electrode of the first battery cluster and the negative electrode of the first energy storage converter; the second negative electrode branch is respectively connected to the negative electrode of the second battery cluster and the negative electrode of the second energy storage converter.

3. The control system according to claim 2, characterized in that: The first positive branch and the first negative branch are connected in series with a first DC circuit breaker; The second positive branch and the second negative branch are connected in series with a second DC circuit breaker.

4. The control system according to claim 3, characterized in that: The first low-voltage module includes a first isolated feedback submodule, and the second low-voltage module includes a second isolated feedback submodule; The first isolation feedback submodule is electrically connected to the first DC circuit breaker and is used to monitor the opening and closing status of the first DC circuit breaker; The second isolation feedback submodule is electrically connected to the second DC circuit breaker and is used to monitor the opening and closing status of the second DC circuit breaker.

5. The control system according to claim 2, characterized in that: The first negative electrode branch is connected in series with a first shunt, and the second negative electrode branch is connected in series with a second shunt; The first low-voltage module includes a first shunt sampling submodule electrically connected to the first shunt, for monitoring the current of the first negative branch; the second low-voltage module includes a second shunt sampling submodule electrically connected to the second shunt, for monitoring the current of the second negative branch.

6. The control system according to claim 2, characterized in that: The first positive branch is connected in series with a first fuse, and the second positive branch is connected in series with a second fuse; The first low-voltage module includes a first fuse feedback submodule for monitoring the state of the first fuse; the second low-voltage module includes a second fuse feedback submodule for monitoring the state of the second fuse.

7. The control system according to claim 2, characterized in that: The first positive electrode branch is connected in series with a first positive electrode contactor, and the first negative electrode branch is connected in series with a first negative electrode contactor; the second positive electrode branch is connected in series with a second positive electrode contactor, and the second negative electrode branch is connected in series with a second negative electrode contactor; The first low-voltage module includes a first positive contactor coil drive feedback submodule and a first negative contactor coil drive feedback submodule; the second low-voltage module includes a second positive contactor coil drive feedback submodule and a second negative contactor coil drive feedback submodule; The first positive contactor coil drive feedback submodule is electrically connected to the first positive contactor for controlling and monitoring the first positive contactor; the first negative contactor coil drive feedback submodule is electrically connected to the first negative contactor for controlling and monitoring the first negative contactor; the second positive contactor coil drive feedback submodule is electrically connected to the second positive contactor for controlling and monitoring the second positive contactor; the second negative contactor coil drive feedback submodule is electrically connected to the second negative contactor for controlling and monitoring the second negative contactor.

8. The control system according to claim 2, characterized in that: The first positive contactor is connected in parallel with a first pre-charging resistor, which is connected in series with the first pre-charging contactor; the second positive contactor is connected in parallel with a second pre-charging resistor, which is connected in series with the second pre-charging contactor; The first low-voltage module includes a first pre-charge contactor coil driving submodule, and the second low-voltage module includes a second pre-charge contactor coil driving submodule; The first pre-charging contactor coil driving submodule is electrically connected to the first pre-charging contactor for driving the first pre-charging contactor; the second pre-charging contactor coil driving submodule is electrically connected to the second pre-charging contactor for driving the second pre-charging contactor.

9. The control system according to any one of claims 1 to 8, characterized in that: The first low-voltage module includes a first main control system power supply submodule, and the second low-voltage module includes a second main control system power supply submodule; The first main control system power supply submodule and the second main control system power supply submodule are respectively powered by the battery management system, and are used to supply power to the first low-voltage module and the second low-voltage module respectively.

10. The control system according to any one of claims 1 to 8, characterized in that: The first low-voltage module includes an address allocation output module, and the second low-voltage module includes an address allocation input module; The address allocation output module is electrically connected to the address allocation input module.

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