Auxiliary power supply circuit of energy storage converter

Abstract

The utility model discloses an auxiliary power supply circuit of an energy storage converter, which comprises a PCS auxiliary circuit, and the input end of the PCS auxiliary circuit is respectively connected with an alternating current power supply side and a battery side; the N phase of the AC power supply side and the battery side are connected through a neutral line to form a power supply loop; and a circuit break controller is arranged on a connecting line between the positive electrode end of the battery side and the middle line. According to the utility model, power can be synchronously supplied to the PCS auxiliary circuit through the AC power supply side and the battery side in a three-phase four-wire system power supply mode, and the situation that the operation condition of equipment of the energy storage converter cannot be monitored when any one power supply side fails can be avoided, so that potential safety hazards and unpredictable risks are reduced. And a circuit break controller is designed on a connecting line between the positive end of the battery side and the neutral line, so that a power supply loop is cut off through the circuit break controller when the voltage of the battery side is higher than that of the alternating current power supply side, and the PCS cannot be normally started due to voltage imbalance of positive and negative buses of the alternating current power supply side is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage system technical field, concretely is a kind of energy storage converter auxiliary power supply circuit. BACKGROUND

[0002] Energy storage converter (PCS) as the important component unit in energy storage system, on the one hand, as the device connecting energy storage medium and power grid, realizes the exchange of energy, both play an important role in the efficient use of energy storage medium, also affect the stable operation of power grid;On the other hand, as the device connecting energy storage medium and load, play the role of independent power supply, affect the power quality of load. Among them, the auxiliary power supply module of energy storage converter is mainly used for the communication of PCS and operation host, and then obtains the working state, control parameter and fault alarm of energy storage converter. According to the application scene and electric energy conversion demand of user using PCS, the auxiliary power supply module power supply of PCS mainly comes from one of alternating current or direct current.

[0003] Traditional auxiliary power supply is single power supply, and single power supply limits the power supply mode, and cannot accurately judge whether power electronic equipment fails and power equipment adjusts parameters;When the power supply side fails, the running condition of the equipment of energy storage converter cannot be monitored, and security risks and unpredictable risks are prone to occur. UTILITY MODEL CONTENT

[0004] Therefore, the utility model aims at providing a kind of energy storage converter auxiliary power supply circuit to solve the technical problems mentioned in prior art.

[0005] A kind of energy storage converter auxiliary power supply circuit, including PCS auxiliary circuit, the input of the PCS auxiliary circuit is respectively connected to alternating current power supply side and battery side;

[0006] The N phase of the alternating current power supply side and the battery side are connected by middle wire to form a power supply loop;

[0007] Break control ware is arranged on the connection line of the positive terminal of the battery side and the middle wire.

[0008] Optionally, the output of the alternating current power supply side and the battery side is respectively provided with rectifier diode.

[0009] Optionally, the battery side includes:

[0010] Battery module has several groups of series / parallel battery packs;

[0011] Two groups of capacitors are arranged on the connection line of the middle wire and the positive terminal and negative terminal of the battery module.

[0012] Optionally, the circuit breaking voltage of the circuit breaking controller is 220V-300V.

[0013] Optionally, the circuit breaking controller is a relay or an isolation transformer.

[0014] Optionally, the AC voltage value of the AC power supply side is 400V-800V.

[0015] Optionally, the DC voltage value of the battery side is 450V-1500V.

[0016] The utility model discloses a beneficial effect can produce including:

[0017] The utility model provides a kind of energy storage converter auxiliary power supply circuit, the output common end of AC power supply side and battery side is connected to form power supply loop by middle wire, to be powered in three-phase four-wire system power supply mode by AC power supply side and battery side synchronous to PCS auxiliary circuit, it can avoid the operation of the equipment of energy storage converter cannot be monitored when any one power supply side of them fails, to reduce security risk and unpredictable risk.And the connection line of the positive pole end of battery side and middle wire is designed circuit breaking controller, to be cut off by circuit breaking controller when the voltage of battery side is higher than the voltage of AC power supply side, prevent the voltage imbalance of positive busbar of AC power supply side to cause that PCS cannot normally start. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the circuit schematic diagram of the utility model's a kind of energy storage converter auxiliary power supply circuit;

[0019] In the drawing: 1, PCS auxiliary circuit, 2, AC power supply side, 3, battery side, 4, circuit breaking controller, 5, middle wire, 6, rectifier diode, 7, capacitor. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.

[0021] Please refer to Figure 1The utility model provides a kind of energy storage converter auxiliary power supply power supply circuit, including PCS auxiliary circuit 1, the input of PCS auxiliary circuit 1 is respectively connected with alternating current power supply side 2 and battery side 3, wherein, alternating current power supply side 2 AC voltage value is 400V~800V, battery side 3 DC voltage value is 450V~1500V;N phase of alternating current power supply side 2 and battery side 3 are connected to form power supply loop by middle wire 5;With in three-phase four-wire system power supply mode, battery side 3 is simultaneously powered to PCS auxiliary circuit 1 by alternating current power supply side 2, can avoid any one power supply side failure to cause the operating condition of the equipment of energy storage converter cannot be monitored, to reduce security risk and unpredictable risk. Specifically, when the voltage of battery side 3 is higher than the voltage of alternating current power supply side 2, battery side 3 will charge the negative bus of alternating current power supply side 2 by middle wire 5, therefore, the positive terminal of battery side 3 is provided with circuit breaker controller 4 on the connection line of middle wire 5 in the embodiment, can cut off power supply loop by circuit breaker controller 4, prevent the voltage imbalance of positive and negative bus of alternating current power supply side 2 from leading to PCS cannot be normally started, to be powered to PCS auxiliary circuit 1 by alternating current power supply side 2 and battery side 3 simultaneously, and simultaneously, user can also independently power from any one of alternating current power supply side 2 and battery side 3 according to use demand.

[0022] In the above, circuit breaker controller 4 is relay or isolation transformer;In the embodiment, relay is preferred, after PCS normal start, user can freely switch on and off of relay to realize the switching of AC and DC power supply, to select more stable and reliable power supply mode for the power supply of PCS auxiliary circuit 1. Wherein, the circuit breaking voltage of circuit breaker controller 4 is 220V~300V, in the embodiment, when alternating current power supply side 2 and battery side 3 supply power simultaneously, if the voltage of battery side 3 exceeds 300V, then disconnect relay to cut off power supply loop, ensure that PCS is normally started.

[0023] In the above, the output of alternating current power supply side 2 and battery side 3 is provided with rectifier diode 6 respectively, can avoid wiring process due to positive and negative pole connection wrong to circuit and equipment damage, wherein, rectifier diode 6 is located alternating current power supply side 2 access point two sides are provided with two groups, and a group is respectively arranged on the connection line of positive and negative pole of battery side 3 and PCS auxiliary circuit 1. Battery side 3 includes battery module and two groups of capacitors 7, and battery module has several groups of series / parallel battery packs;Two groups of capacitors 7 are respectively arranged on the connection line of middle wire 5 and the positive terminal and negative terminal of battery module, for cutting off DC while ensuring that AC signal of alternating current power supply side 2 passes through.

Claims

1. An energy storage converter auxiliary power supply power supply circuit comprising a PCS auxiliary circuit (1), characterized by, The input end of the PCS auxiliary circuit (1) is connected to the AC power supply side (2) and the battery side (3) respectively; The N phase of the AC power supply side (2) and the battery side (3) are connected through the neutral line (5) to form a power supply loop; The positive terminal of the battery side (3) is provided with a circuit breaker controller (4) on the connection line of the neutral line (5).

2. The energy storage inverter auxiliary power supply power supply circuit according to claim 1, characterized in that, The output end of the AC power supply side (2) and the battery side (3) is respectively provided with a rectifier diode (6).

3. The energy storage inverter auxiliary power supply power supply circuit of claim 1, wherein, The battery side (3) comprises: A battery module with a plurality of groups of series / parallel battery packs; Two groups of capacitors (7) are respectively arranged on the connection line of the neutral line (5) and the positive and negative terminals of the battery module.

4. The energy storage inverter auxiliary power supply power supply circuit of claim 1, wherein, The circuit breaking voltage of the circuit breaker controller (4) is 220V-300V.

5. The energy storage inverter auxiliary power supply power supply circuit of claim 1, wherein, The circuit breaker controller (4) is a relay or an isolation transformer.

6. The energy storage inverter auxiliary power supply power supply circuit of claim 1, wherein, The AC voltage value of the AC power supply side (2) is 400V-800V.

7. The energy storage inverter auxiliary power supply power supply circuit of claim 1, wherein, The DC voltage value of the battery side (3) is 450V-1500V.

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