Standby power supply device of energy storage system

Abstract

The utility model provides a standby power supply device of an energy storage system. The standby power supply device comprises a contactor, a circuit breaker, a first conversion circuit and a second conversion circuit, the input end of the first conversion circuit is connected with commercial power, the cathode input end of the second conversion circuit is connected with the contactor main loop and the circuit breaker, the anode input end of the second conversion circuit is connected with the anode of the battery system main loop, and the main loop of the contactor and the circuit breaker are connected with the cathode of the battery system main loop; the output end of the first conversion circuit and the output end of the second conversion circuit are connected with the auxiliary power distribution system; the first conversion circuit converts commercial power into direct current, and the second conversion circuit converts the direct current into direct current to supply power to the auxiliary power distribution system; the contactor major loop is connected in parallel with the breaker. According to the utility model, the UPS can be replaced, the size can be reduced, the cost is saved, and the AC side obtains direct current through the first conversion circuit and outputs the direct current to the auxiliary power distribution system; and the direct current side outputs direct current to the auxiliary power distribution system through the second conversion circuit.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of standby power supply, specifically relates to a standby power supply device of energy storage system. BACKGROUND

[0002] Black start refers to the whole system stops running due to fault, the system is all power off (not excluding isolated small power grid still maintains operation), is in all "black" state, does not rely on the help of other network, through the generator set with self-starting ability in system starts black start power - the switching power supply for obtaining DC or AC power supply to power supply control system.

[0003] In the prior art, the energy storage system will be configured with a UPS, the power supply provided by the UPS is connected to the battery management system, and the switching of the energy storage system is controlled through the battery management system to realize the auxiliary DC power supply of the energy storage system, and finally realize the power-free debugging or black start of the energy storage system. The backup time that can be realized by the UPS is limited, usually 30 minutes to 120 minutes. The UPS is usually installed in the energy storage system container, and different capacity batteries are configured according to the backup time, which has a very large volume and is expensive. UTILITY MODEL CONTENT

[0004] In order to overcome the above technical defects, the utility model provides a kind of standby power supply device of energy storage system, which can reduce the cost of standby power supply.

[0005] In order to solve the above problems, the utility model is realized according to the following technical scheme:

[0006] A kind of standby power supply device of energy storage system, the energy storage system includes: battery system main circuit, auxiliary power distribution system, the standby power supply device includes: contactor, circuit breaker, first conversion circuit, second conversion circuit;

[0007] The input end of the first conversion circuit is connected with the commercial power, the negative input end of the second conversion circuit is connected with the main circuit of the contactor and the circuit breaker, the positive input end of the second conversion circuit is connected with the positive pole of the battery system main circuit, and the main circuit of the contactor and the circuit breaker are connected with the negative pole of the battery system main circuit;

[0008] The output end of the first conversion circuit and the output end of the second conversion circuit are connected with the auxiliary power distribution system;

[0009] The first conversion circuit converts commercial power into DC power, and the second conversion circuit converts DC power into DC power to supply power to the auxiliary power distribution system;

[0010] The contactor and the circuit breaker are arranged in parallel.

[0011] As a further improvement of the utility model, the first conversion circuit includes: AC-DC conversion unit, first voltage reduction unit.

[0012] The input end of the AC-DC conversion unit is connected with commercial power, the output end of the AC-DC conversion unit is connected with the input end of the first voltage reduction unit, and the output end of the first voltage reduction unit is connected with the auxiliary power distribution system.

[0013] As a further improvement of the utility model, the AC-DC conversion unit includes: rectifier bridge, first capacitor.

[0014] The rectifier bridge is connected with the commercial power and the first voltage reduction unit, and the first capacitor is connected with the rectifier bridge.

[0015] As a further improvement of the utility model, the first voltage reduction unit includes: first inductor, first MOS tube.

[0016] The first side of the first inductor is connected with the rectifier bridge and the first MOS tube respectively.

[0017] The second side of the first inductor is connected with the auxiliary power distribution system.

[0018] As a further improvement of the utility model, the first conversion circuit further includes: first anti-reverse connection diode.

[0019] The second side of the first inductor is connected with the auxiliary power distribution system through the first anti-reverse connection diode.

[0020] As a further improvement of the utility model, the first conversion circuit further includes: first rectifier diode, first filter capacitor.

[0021] The second side of the first inductor is connected with the auxiliary power distribution system through the first rectifier diode and the first anti-reverse connection diode which are forwardly conducted.

[0022] The second side of the first inductor is connected with the ground through the first rectifier diode and the first filter capacitor which are forwardly conducted.

[0023] As a further improvement of the utility model, the second conversion circuit includes: second rectifier diode, second filter capacitor, second voltage reduction unit.

[0024] The positive pole of the battery system main circuit is connected with the input end of the second voltage reduction unit through the second rectifier diode which is forwardly conducted.

[0025] The positive pole of the battery system main circuit is connected with the ground through the second rectifier diode and the second filter capacitor which are forwardly conducted.

[0026] The output end of the second voltage reduction unit is connected to the auxiliary power distribution system.

[0027] As a further improvement of the utility model, the second voltage reduction unit comprises a second inductor, a second MOS tube;

[0028] The first side of the second inductor is connected to the second rectifier diode and the second MOS tube respectively.

[0029] The second side of the second inductor is connected to the auxiliary power distribution system.

[0030] As a further improvement of the utility model, the second voltage reduction unit further comprises a second anti-reverse connection diode.

[0031] The second side of the second inductor is connected to the auxiliary power distribution system through the second anti-reverse connection diode.

[0032] As a further improvement of the utility model, the second voltage reduction unit further comprises a third rectifier diode and a third filter capacitor.

[0033] The second side of the second inductor is connected to the auxiliary power distribution system through the forward conducting third rectifier diode and the forward conducting second anti-reverse connection diode.

[0034] The second side of the second inductor is connected to the ground through the forward conducting third rectifier diode and the third filter capacitor.

[0035] Compared with the prior art, the backup power supply device has the following beneficial effects: the backup power supply device is used to replace the UPS, the volume can be reduced, the cost can be saved, the AC side obtains DC output through the first conversion circuit and outputs the DC to the auxiliary power distribution system; the DC side outputs DC through the second conversion circuit and outputs the DC to the auxiliary power distribution system, works when the commercial power is powered on, and the auxiliary power supply is provided by the commercial power; works when the commercial power is powered off, and the backup power supply is provided by the battery system. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The backup power supply device is a schematic diagram in actual application.

[0037] Figure 2 The backup power supply device is a structural schematic diagram.

[0038] Figure 3 The first conversion circuit and the second conversion circuit are structural schematic diagrams.

[0039] Figure 4 The contactor and the divided excitation release are connection schematic diagrams.

[0040] The reference signs are explained as follows: 1, backup power supply device; 11, first conversion circuit; 12, second conversion circuit. DETAILED DESCRIPTION

[0041] The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described herein are only used for illustrating and explaining the utility model, and are not used for limiting the utility model.

[0042] Referring to Figures 1 to 4 The utility model provides a kind of backup power supply device of energy storage system, energy storage system includes: battery system main circuit, auxiliary power distribution system, backup power supply device 1 includes: contactor KM, circuit breaker QF1, first conversion circuit 11, second conversion circuit 12;The input end of first conversion circuit 11 is connected with commercial power, the negative input end of second conversion circuit 12 is connected with the main circuit of contactor KM, circuit breaker QF1, the positive input end of second conversion circuit 12 is connected with the negative pole of battery system main circuit;The main circuit of contactor KM, circuit breaker QF1 is connected with the negative pole of battery system main circuit, the output end of first conversion circuit 11, the output end of second conversion circuit 12 is connected with auxiliary power distribution system;First conversion circuit 11 converts commercial power into direct current, and second conversion circuit 12 converts direct current into direct current to power supply auxiliary power distribution system;The main circuit of contactor KM is provided in parallel with circuit breaker QF1.That is, when commercial power is powered, auxiliary power supply is provided by commercial power;When commercial power is powered off, backup power supply is provided by battery system.

[0043] Backup power supply device is used to replace UPS, can reduce size, and also can save cost, AC side is converted into direct current by first conversion circuit and exported to auxiliary power distribution system;DC side is exported to auxiliary power distribution system by second conversion circuit.

[0044] First conversion circuit 11 includes: AC-DC conversion unit, first voltage reduction unit;The input end L of AC-DC conversion unit is connected with the L of commercial power, and the input end N is connected with the N of commercial power, and the output end of AC-DC conversion unit is connected with the input end of first voltage reduction unit, and the output end of first voltage reduction unit is connected with auxiliary power distribution system.

[0045] AC-DC conversion unit includes: rectifier bridge, first capacitor C1;Rectifier bridge is connected with commercial power and first voltage reduction unit, and first capacitor C1 is connected with the rectifier bridge.

[0046] Specifically, rectifier bridge includes: diode D1, diode D2, diode D3, diode D4.

[0047] The first voltage reduction unit comprises a first inductor L1 and a first MOS tube Q1; the first side of the first inductor L1 is connected to a rectifier bridge and the first MOS tube Q1 respectively; the second side of the first inductor L1 is connected to an auxiliary power distribution system; and the working state of the first MOS tube Q1 can be controlled by a controller.

[0048] In order to provide safety of the backup power supply device, the first conversion circuit 11 further comprises a first anti-reverse connection diode D6; the second side of the first inductor L1 is connected to the auxiliary power distribution system through the first anti-reverse connection diode D6.

[0049] The first conversion circuit 11 further comprises a first rectifier diode D5 and a first filter capacitor C2; the second side of the first inductor L1 is connected to the auxiliary power distribution system through the forward-conducting first rectifier diode D5 and the forward-conducting first anti-reverse connection diode D6; and the second side of the first inductor L1 is grounded through the forward-conducting first rectifier diode D5 and the first filter capacitor C2.

[0050] The second conversion circuit 12 comprises a second rectifier diode D7, a second filter capacitor C3 and a second voltage reduction unit; the positive pole DC+ of a battery system main circuit is connected to the input end of the second voltage reduction unit through the forward-conducting second rectifier diode D7; the positive pole of the battery system main circuit is grounded through the forward-conducting second rectifier diode D7 and the second filter capacitor C3; the output end of the second voltage reduction unit is connected to the auxiliary power distribution system; the negative pole input end of the second conversion circuit 12 is grounded after the positive pole DC- of the battery system main circuit is connected to the contactor KM.

[0051] The second voltage reduction unit comprises a second inductor L2 and a second MOS tube Q2; the first side of the second inductor L2 is connected to the second rectifier diode D7 and the second MOS tube respectively; the second side of the second inductor L2 is connected to the auxiliary power distribution system; and the working state of the second MOS tube Q2 can be controlled by a controller.

[0052] Similarly, the second voltage reduction unit further comprises a second anti-reverse connection diode D9; the second side of the second inductor is connected to the auxiliary power distribution system through the second anti-reverse connection diode D9; the cathodes of the first anti-reverse connection diode D6 and the second anti-reverse connection diode D9 serve as a positive pole output end; and a third filter capacitor C5 is further connected between the positive pole output end and a negative pole output end.

[0053] The second voltage reduction unit further comprises a third rectifier diode D8 and a third filter capacitor C4; the second side of the second inductor L2 is connected to the auxiliary power distribution system through the forward-conducting third rectifier diode D8 and the forward-conducting second anti-reverse connection diode D9; and the second side of the second inductor L2 is grounded through the forward-conducting third rectifier diode D8 and the third filter capacitor C4.

[0054] In addition, the circuit breaker QF1 also has a separate excitation tripping device iMX, the coil (C1, C2) of the separate excitation tripping device iMX is connected with a 24V power supply and the normally open contact (15, 16) of the relay KA2, which is controlled by the management system, so as to remotely control the closing and opening of the circuit breaker QF1, and the specific control process is as follows: when the coil (13, 14) of the relay KA2 is powered, the normally open contact (15, 16) of the relay KA2 is closed, and the coil (C1, C2) of the separate excitation tripping device iMX is powered to work. The state feedback contact (1, 2) of the contactor KM is also connected in the management system.

[0055] The contactor KM is controlled to be closed by the management system, and specifically, the control contact (3, 4) of the contactor KM is connected with the normally open contact (15, 16) of the relay KA1, when the coil (13, 14) of the relay KA1 is powered, the normally open contact (15, 16) of the relay KA1 is closed, and the control contact (3, 4) of the contactor KM is powered, so that the main circuit of the contactor is closed.

[0056] The working principle of the utility model is as follows:

[0057] After the alternating current is changed into direct current by the diode bridge rectifier circuit composed of diode D1-diode D4, the bus voltage after filtering of the first capacitor C1 is regulated, the bus voltage is driven by the first MOS tube Q1 to carry out chopper processing, and then the direct current is obtained by rectification and filtering of the first rectifier diode D5, the first filter capacitor C2 and the third filter capacitor C5, and then the direct current (i.e. Figure 2 24+ and 24- in the auxiliary power distribution system.

[0058] The stable voltage is obtained after the second MOS tube Q2 drives the isolation chopper, and then the direct current is output after the third filter capacitor C4 and the third filter capacitor C5.

[0059] The two circuit direct current output ports are all configured with anti-reverse diodes to prevent current from reversing.

[0060] When there is no access of the commercial power supply, the battery system is powered for the first time, the circuit breaker QF1 is closed, at this time, the standby power supply device 1 preferentially takes power from the direct current side, and outputs 24V direct current to supply the auxiliary power distribution system, at the same time, the contactor KM is controlled to be closed by the management system, and the auxiliary power distribution system obtains the signal supplied by the standby power supply. After the system is normally powered by the commercial power supply, the standby power supply device 1 takes power from the external commercial power supply 220V, and does not consume the energy of the battery system, when the commercial power supply is powered off, the auxiliary system is powered by the battery system, and at the same time, the management system controls the circuit breaker QF1 and the contactor KM to be opened when the energy of the battery system is too low, so as to avoid that the energy of the battery system is too low.

[0061] The standby power supply device of the utility model reduces from 8U space to 1U space, and the initial investment cost is reduced from 8000 yuan to 500 yuan, thereby greatly reducing the cost and reducing the space.

[0062] The above is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A backup power supply apparatus for an energy storage system, the energy storage system comprising: The battery system main loop, auxiliary power distribution system, characterized in that the standby power supply device comprises: a contactor, a circuit breaker, a first conversion circuit, a second conversion circuit; The input end of the first conversion circuit is connected with the commercial power, the negative input end of the second conversion circuit is connected with the main loop of the contactor and the circuit breaker, the positive input end of the second conversion circuit is connected with the positive pole of the battery system main loop, and the main loop of the contactor and the circuit breaker are connected with the negative pole of the battery system main loop; The output end of the first conversion circuit and the output end of the second conversion circuit are connected with the auxiliary power distribution system; The first conversion circuit converts the commercial power into direct current, and the second conversion circuit converts the direct current into direct current to supply power to the auxiliary power distribution system; The main loop of the contactor is arranged in parallel with the circuit breaker.

2. The backup power supply device according to claim 1, characterized by The first conversion circuit comprises: an AC / DC conversion unit, a first voltage reduction unit; The input end of the AC / DC conversion unit is connected with the commercial power, the output end of the AC / DC conversion unit is connected with the input end of the first voltage reduction unit, and the output end of the first voltage reduction unit is connected with the auxiliary power distribution system.

3. The backup power supply device according to claim 2, characterized by The AC / DC conversion unit comprises: a rectifier bridge, a first capacitor; The rectifier bridge is connected with the commercial power and the first voltage reduction unit, and the first capacitor is connected with the rectifier bridge.

4. The backup power supply device according to claim 3, characterized by The first voltage reduction unit comprises: a first inductor, a first MOS tube; The first side of the first inductor is respectively connected with the rectifier bridge and the first MOS tube; The second side of the first inductor is connected with the auxiliary power distribution system.

5. The backup power supply device according to claim 4, characterized by The first conversion circuit further comprises: a first anti-reverse connection diode; The second side of the first inductor is connected with the auxiliary power distribution system through the first anti-reverse connection diode.

6. The backup power supply device according to claim 5, characterized by The first conversion circuit further comprises: a first rectifier diode, a first filter capacitor; The second side of the first inductor is connected with the auxiliary power distribution system through the forward-conducting first rectifier diode and the forward-conducting first anti-reverse connection diode; The second side of the first inductor is grounded through the forward-conducting first rectifier diode and the first filter capacitor.

7. The backup power supply device according to claim 1, characterized by The second conversion circuit comprises: a second rectifier diode, a second filter capacitor, and a second voltage reduction unit; The positive pole of the battery system main loop is connected with the input end of the second voltage reduction unit through the forward-conducting second rectifier diode; The positive pole of the battery system main loop is grounded through the forward-conducting second rectifier diode and the second filter capacitor; The output end of the second voltage reduction unit is connected with the auxiliary power distribution system.

8. The backup power supply device according to claim 7, characterized by The second voltage reduction unit comprises: a second inductor, a second MOS tube; The first side of the second inductor is respectively connected with the second rectifier diode and the second MOS tube; The second side of the second inductor is connected with the auxiliary power distribution system.

9. The backup power supply device according to claim 8, characterized by The second voltage reduction unit further comprises: a second anti-reverse connection diode; The second side of the second inductor is connected with the auxiliary power distribution system through the second anti-reverse connection diode.

10. The backup power supply device according to claim 9, characterized by The second voltage reduction unit further comprises: a third rectifier diode, a third filter capacitor; The second side of the second inductor is connected to the auxiliary power distribution system through the forward conducting third rectifier diode and the forward conducting second reverse connection prevention diode; The second side of the second inductor is grounded through the forward conducting third rectifier diode and the third filter capacitor.

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