Battery cluster mutual electricity taking power supply device for battery cluster series connection type direct current power supply

Abstract

The utility model relates to the technical field of electrical automation equipment, in particular to a battery cluster mutual electricity taking power supply device for a battery cluster series connection type direct-current power supply, which comprises N isolation type direct-current voltage-stabilized power supplies, N-1 bidirectional isolation type direct-current voltage-stabilized power supplies, two direct-current voltage-stabilized power supplies and two single-phase isolation transformers. The device can provide a multi-redundancy control power supply for each battery cluster device, greatly improves the reliability of the control power supply of the battery cluster control unit, enables the bypass state of the bypassed battery cluster device to be continuously monitored, and improves the operation reliability of the whole battery cluster tandem type direct-current power supply device.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical automation equipment, in particular to a battery cluster mutual power supply device for a battery cluster series direct current power supply. Background Art

[0002] After the battery clusters are connected in series through the battery cluster control unit, they can form an H-bridge series-type high-voltage cascade battery energy storage converter, or they can be directly connected to the DC side of a modular multilevel converter (also known as an MMC converter) to form an MMC-type high-voltage cascade battery energy storage converter.

[0003] When a battery cluster fails, the faulty battery cluster is bypassed through the battery cluster control unit, which does not affect the continuous operation of the entire energy storage inverter. However, after being bypassed, the faulty battery cluster can no longer be charged, and its battery cluster control unit needs to continue to consume battery cluster power to monitor the status of the faulty battery cluster until the faulty battery cluster is replaced during subsequent power outage maintenance. If the faulty battery cluster control unit can obtain control power from an adjacent battery cluster, the time for power outage maintenance can be greatly delayed. Therefore, it is necessary to find a control power supply method for a multi-redundant battery cluster control unit to improve the overall reliability of the high-voltage cascade energy storage inverter. Utility Model Content

[0004] The utility model provides a battery cluster mutual power supply device for battery cluster series DC power supply to overcome the shortcomings of the control power supply mode of the existing battery cluster control unit and improve the power supply reliability of the battery cluster control unit.

[0005] In order to achieve the purpose of the utility model, the technical scheme adopted is: a battery cluster mutual power supply device for a battery cluster series DC power supply, characterized in that: it includes N isolated DC regulated power supplies, N-1 bidirectional isolated DC regulated power supplies, two DC regulated power supplies and two single-phase isolation transformers, the AC input terminals AC1 and AC2 of the first DC regulated power supply VS1 are respectively connected to the secondary side of the first single-phase isolation transformer T1, the AC input terminals AC1 and AC2 of the second DC regulated power supply VS2 are respectively connected to the secondary side of the second single-phase isolation transformer T2, and the primary sides of the single-phase isolation transformers T1 and T2 are connected together in parallel and connected to an external AC power supply;

[0006] The left DC positive terminal L1+, L2+ and negative terminal L- of the first bidirectional isolated DC regulated power supply BPS are respectively connected to the DC output positive pole D1+, D2+ and negative pole D- of the first DC regulated power supply VS1, the left DC positive terminal L1+, L2+ and negative terminal L- of the Kth bidirectional isolated DC regulated power supply BPS are respectively connected to the DC output positive pole VC1+, VC2+ and negative pole VC- of the Kth isolated DC regulated power supply PS; the right DC positive terminal R1+, R2+ and negative terminal R- of the Kth bidirectional isolated DC regulated power supply BPS are respectively connected to the DC output positive pole VC1+, VC2+ and negative pole VC- of the K+1th isolated DC regulated power supply PS;

[0007] The right DC positive terminal R1+, R2+ and negative terminal R- of the N-1th bidirectional isolated DC regulated power supply BPS are also connected to the DC output positive electrode D1+, D2+ and negative electrode D- of the second DC regulated power supply VS2 respectively;

[0008] The DC output positive electrode VC2+ and negative electrode VC- of each isolated DC regulated power supply serve as control power for the battery cluster control unit in the corresponding battery cluster device.

[0009] As an optimization solution of the utility model, a battery cluster device includes a battery cluster and a battery cluster control unit. N battery cluster devices are connected in series to form a positive output terminal BAT+ and a negative output terminal BAT-. The N battery cluster devices connected in series correspond to N isolated DC regulated power supplies.

[0010] The utility model has positive effects: 1) After a battery cluster is bypassed by its control unit due to its own fault, the control unit can obtain control power from two adjacent battery cluster devices, and can also obtain redundant control power from more other adjacent battery cluster devices, so that the state of the bypassed battery cluster can be continuously monitored, thereby improving the operating reliability of the battery cluster series high-voltage cascade energy storage converter device and delaying the power outage maintenance time of the faulty battery cluster;

[0011] 2) The utility model device can provide multiple redundant control power supplies for each battery cluster device, greatly improving the reliability of the control power supply of the battery cluster control unit, so that the bypass status of the bypassed battery cluster device can be continuously monitored, thereby improving the operating reliability of the entire battery cluster series DC power supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0013] Figure 1 The utility model is a circuit connection diagram of a battery cluster series-connected DC power supply. DETAILED DESCRIPTION

[0014] like Figure 1 As shown, the utility model discloses a battery cluster mutual power supply device for a battery cluster series DC power supply, characterized in that: it includes N isolated DC regulated power supplies, N-1 bidirectional isolated DC regulated power supplies, two DC regulated power supplies and two single-phase isolation transformers, the AC input terminals AC1 and AC2 of the first DC regulated power supply VS1 are respectively connected to the secondary side of the first single-phase isolation transformer T1, the AC input terminals AC1 and AC2 of the second DC regulated power supply VS2 are respectively connected to the secondary side of the second single-phase isolation transformer T2, and the primary sides of the single-phase isolation transformers T1 and T2 are connected together in parallel and connected to an external AC power supply;

[0015] The left DC positive terminal L1+, L2+ and negative terminal L- of the first bidirectional isolated DC regulated power supply BPS are respectively connected to the DC output positive pole D1+, D2+ and negative pole D- of the first DC regulated power supply VS1, the left DC positive terminal L1+, L2+ and negative terminal L- of the Kth bidirectional isolated DC regulated power supply BPS are respectively connected to the DC output positive pole VC1+, VC2+ and negative pole VC- of the Kth isolated DC regulated power supply PS; the right DC positive terminal R1+, R2+ and negative terminal R- of the Kth bidirectional isolated DC regulated power supply BPS are respectively connected to the DC output positive pole VC1+, VC2+ and negative pole VC- of the K+1th isolated DC regulated power supply PS;

[0016] The right DC positive terminal R1+, R2+ and negative terminal R- of the N-1th bidirectional isolated DC regulated power supply BPS are also connected to the DC output positive electrode D1+, D2+ and negative electrode D- of the second DC regulated power supply VS2 respectively;

[0017] The DC output positive electrode VC2+ and negative electrode VC- of each isolated DC regulated power supply serve as the control power supply of the battery cluster control unit in the corresponding battery cluster device. Wherein, K = 1, 2...N-1.

[0018] The DC regulated power supply can be SWADP-X / X / 24 of Wuxi Xiwei Qingtuo Electric Co., Ltd., the isolated DC regulated power supply can be SWDDP-X / X / 24 of Wuxi Xiwei Qingtuo Electric Co., Ltd., and the bidirectional isolated DC regulated power supply can be SWDD-X / 24 / 24 of Wuxi Xiwei Qingtuo Electric Co., Ltd.

[0019] Working principle:

[0020] like Figure 1 As shown, the figure shows the series connection relationship between the first battery cluster device to the Nth battery cluster device in the battery cluster series DC power supply, and the connection relationship between the battery cluster mutual power supply device of the present utility model and each battery cluster device. Figure 1 In the figure, each battery cluster device includes a battery cluster and a battery cluster control unit. N battery cluster devices are connected in series to form a positive output terminal BAT+ and a negative output terminal BAT-. The dotted box below is a block diagram of the battery cluster mutual power supply device of the present invention.

[0021] In the utility model, N isolated DC regulated power supplies PS(1)-PS(N) respectively draw power from the positive and negative terminals of the battery cluster of the corresponding battery cluster device, and the regulated output terminals are VC1+, VC2+ and VC-, wherein VC2+ / VC- provide control power for the battery cluster control unit, wherein the regulated output terminal of the Kth isolated DC regulated power supply PS(K) is also connected to the right DC positive and negative terminals of the K-1th bidirectional isolated DC regulated power supply BPS(K-1) and the left DC positive and negative terminals of the K+1th bidirectional isolated DC regulated power supply BPS(K+1), so that the control power can be provided to the battery cluster control units on the left and right sides through the K-1th and K+1th bidirectional isolated DC regulated power supplies. For the first battery cluster device, when its battery cluster fault is bypassed, its isolated DC regulated power supply PS(1) stops working and no longer draws power from the first battery cluster. The first DC regulated power supply VS(1)(VS1) draws power from the outside through transformer T1 and provides control power to the first battery cluster control unit. At the same time, the bidirectional isolated DC regulated power supply BPS(1) also obtains power from the adjacent battery cluster device and provides control power to the first battery cluster control unit. For the Nth battery cluster device, when its battery cluster fault is bypassed, its isolated DC regulated power supply PS(N) stops working and no longer draws power from the first battery cluster. The second DC regulated power supply VS(2)(VS2) draws power from the outside through transformer T2 and provides control power to the Nth battery cluster control unit. At the same time, the bidirectional isolated DC regulated power supply BPS(N-1) also obtains power from the adjacent battery cluster device and provides control power to the Nth battery cluster control unit. This two-way power supply mode greatly improves the control power reliability of the battery cluster control unit in the battery cluster device. The bypassed battery cluster device can still maintain control power so that its battery cluster status can be continuously monitored, and the bypassed battery cluster does not need to provide power for its own battery cluster control unit.

[0022] The utility model can be applied to an H-bridge series-connected high-voltage cascade battery energy storage converter, and can also be applied to an MMC-type high-voltage cascade battery energy storage converter.

[0023] The above is only a specific implementation circuit schematic diagram of the utility model, and does not limit the protection scope of the utility model. Any equivalent conversion circuit based on the utility model belongs to the protection scope of the utility model.

[0024] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cluster mutual power supply device for a battery cluster series DC power supply, characterized in that: It includes N isolated DC regulated power supplies, N-1 bidirectional isolated DC regulated power supplies, two DC regulated power supplies and two single-phase isolation transformers, the AC input terminals AC1 and AC2 of the first DC regulated power supply VS1 are respectively connected to the secondary side of the first single-phase isolation transformer T1, the AC input terminals AC1 and AC2 of the second DC regulated power supply VS2 are respectively connected to the secondary side of the second single-phase isolation transformer T2, and the primary sides of the single-phase isolation transformers T1 and T2 are connected together in parallel and connected to an external AC power supply; The left DC positive terminal L1+, L2+ and negative terminal L- of the first bidirectional isolated DC regulated power supply BPS are respectively connected to the DC output positive pole D1+, D2+ and negative pole D- of the first DC regulated power supply VS1, the left DC positive terminal L1+, L2+ and negative terminal L- of the Kth bidirectional isolated DC regulated power supply BPS are respectively connected to the DC output positive pole VC1+, VC2+ and negative pole VC- of the Kth isolated DC regulated power supply PS; the right DC positive terminal R1+, R2+ and negative terminal R- of the Kth bidirectional isolated DC regulated power supply BPS are respectively connected to the DC output positive pole VC1+, VC2+ and negative pole VC- of the K+1th isolated DC regulated power supply PS; The DC output positive electrode VC2+ and negative electrode VC- of each isolated DC regulated power supply serve as control power for the battery cluster control unit in the corresponding battery cluster device.

2. The battery cluster mutual power supply device for battery cluster series DC power supply according to claim 1, characterized in that: The right side DC positive terminal R1+, R2+ and negative terminal R- of the N-1th bidirectional isolated DC regulated power supply BPS are also respectively connected to the DC output positive pole D1+, D2+ and negative pole D- of the second DC regulated power supply VS2.

3. The battery cluster mutual power supply device for battery cluster series DC power supply according to claim 2, characterized in that: Each battery cluster device includes a battery cluster and a battery cluster control unit. N battery cluster devices are connected in series to form a positive output terminal BAT+ and a negative output terminal BAT-. The N battery cluster devices connected in series correspond to N isolated DC regulated power supplies.

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