CN214045118U - Battery energy storage structure for power control through H-bridge compensation circuit - Google Patents
Battery energy storage structure for power control through H-bridge compensation circuit Download PDFInfo
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- CN214045118U CN214045118U CN202023033124.XU CN202023033124U CN214045118U CN 214045118 U CN214045118 U CN 214045118U CN 202023033124 U CN202023033124 U CN 202023033124U CN 214045118 U CN214045118 U CN 214045118U
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Abstract
A battery energy storage structure for controlling power through an H-bridge compensation circuit comprises a plurality of battery packs connected in series, a series equalization circuit, the H-bridge compensation circuit, a filter circuit and a controller, wherein the series equalization circuit comprises a plurality of isolated bidirectional DC/DC converters, the input end of each bidirectional DC/DC converter is connected with each battery pack, and the output ends of the bidirectional DC/DC converters are connected in series; the input end of the H-bridge compensation circuit is connected with the output end of the series equalization circuit and is used for compensating the voltage difference between the battery pack and the DC bus voltage to realize charge and discharge control; the input end of the filter circuit is connected with the output end of the H-bridge compensation circuit and the output end of the battery pack; the controller is connected with the series equalization circuit and the H-bridge compensation circuit. The utility model discloses a difference between H bridge compensating circuit regulation group battery and direct current bus voltage realizes charge-discharge control, only less partly flows H bridge compensating circuit in the total power of system, therefore can reduce charge-discharge control equipment power capacity.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a battery charge-discharge field, in particular to carry out power control's battery energy storage structure through H bridge compensating circuit.
[ background of the invention ]
In a lithium battery energy storage system, in order to meet the requirements of the energy storage system on high voltage and high capacity, lithium ion battery monomers need to be connected in series and parallel in a large scale and are finally connected with a high-voltage converter. Due to certain differences of parameters such as the capacity among the single batteries and the internal resistance, the capacity of the whole battery pack is inconsistent, and is limited by a certain single battery when charging and discharging are carried out, so that the overall effective capacity and performance of the battery pack are reduced. When the battery pack is charged and discharged, a voltage difference can occur between the battery pack and the direct current bus, and the charging and discharging of the system can be realized by controlling the voltage difference. If the system power is completely controlled by the charging and discharging converter, the problems of large design power and high cost of the converter can be caused.
[ Utility model ] content
The utility model aims at solving the above problem, and provide a carry out power control's battery energy storage structure through H bridge compensating circuit.
In order to solve the above problems, the present invention provides a battery energy storage structure for controlling power through an H-bridge compensation circuit, which comprises a plurality of series-connected battery packs, wherein each battery pack comprises a plurality of series-connected single batteries, and is characterized in that the battery energy storage structure comprises a series equalization circuit, an H-bridge compensation circuit, a filter circuit, and a controller, wherein the series equalization circuit comprises a plurality of isolated bidirectional DC/DC converters, the input end of each bidirectional DC/DC converter is connected with each battery pack, and the output ends of each bidirectional DC/DC converter are connected in series; the input end of the H-bridge compensation circuit is connected with the output end of the series equalization circuit and is used for compensating the voltage difference between the battery pack and the DC bus voltage to realize charge and discharge control; the input end of the filter circuit is connected with the output end of the H-bridge compensation circuit and the output end of the battery pack; the controller is connected with the series equalization circuit and the H-bridge compensation circuit.
Further, the DC/DC converter comprises switching tubes K1, K2, K3, K4, K5, K6, K7, K8, inductors L1 and L2, capacitors C1 and C2 and a transformer, wherein drains of the switching tubes K1 and K2 and sources of the switching tubes K3 and K4 are respectively connected to the positive end and the negative end of the battery pack; the source electrode of the switching tube K1 is connected with the drain electrode of the switching tube K3, and the common connection point of the switching tube K1 and the drain electrode of the switching tube K3 is connected with one end of the primary coil of the transformer through a capacitor C1 and an inductor L1; the source electrode of the switching tube K2 is connected with the drain electrode of the switching tube K4, and the common connection point of the switching tube K2 and the drain electrode of the switching tube K4 is connected with the other end of the primary coil of the transformer; two ends of the inductor L2 are respectively connected with two ends of a primary coil of the transformer; two ends of the capacitor C2 are respectively connected with the positive end and the negative end of the battery pack; the drains of the switching tubes K5 and K6 are connected with one end of a capacitor C3; the sources of the switching tubes K7 and K8 are connected with the other end of the capacitor C3; the source electrode of the switching tube K5 is connected with the drain electrode of the switching tube K7, and the common connection point of the switching tube K5 and the drain electrode of the switching tube K7 is connected with one end of the secondary coil of the transformer; the source of the switch K6 is connected to the drain of the switch tube K8, and the common connection point is connected to the other end of the secondary winding of the transformer.
Further, the gates of the switching tubes K1, K2, K3, K4, K5, K6, K7 and K8 are respectively connected with the controller.
Further, the H-bridge compensation circuit comprises capacitors C4, C5, switching tubes S1, S2, S3, S4 and an inductor L3, and drains of the switching tubes S1, S3 and sources of the switching tubes S2, S4 are respectively connected to an output end of the series equalization circuit; the source electrode of the switch tube S1 is connected with the drain electrode of the switch tube S2, and the common connection point of the switch tube S1 and the drain electrode of the switch tube S2 is connected with one end of an inductor L3; the source of the switch tube S3 is connected to the drain of the switch tube S4, the common connection point thereof is connected to one end of a capacitor C5, and the other end of the capacitor C5 is connected to the other end of the inductor L3; two ends of the capacitor C4 are respectively connected with the output end of the series equalization circuit.
Furthermore, the filter circuit is an LCL filter circuit and comprises a capacitor C6, an inductor L4 and an inductor L5, one end of the inductor L4 is connected with one end of the inductor L5, and the other end of the inductor L4 is connected with the common connection point of the switching tubes S3 and S4; one end of a capacitor C6 is connected with a common connection point of an inductor L4 and an inductor L5, and the other end of a capacitor C6 is connected with the anode of the battery pack and is connected with a common connection point of the inductor L3 and the capacitor C5.
Further, the gates of the switching tubes S1, S2, S3 and S4 are respectively connected to the controller.
The beneficial contributions of the utility model reside in that, it has effectively solved above-mentioned problem. The utility model discloses a battery energy storage structure that carries out power control through H bridge compensating circuit realizes charge-discharge control through the difference between H bridge compensating circuit regulating battery group and direct current busbar voltage, only less some H bridge compensating circuit that flows in the total power of system, therefore can reduce charge-discharge control equipment power capacity.
[ description of the drawings ]
Fig. 1 is a schematic structural diagram of the present invention.
[ detailed description ] embodiments
The following examples are further to explain and supplement the present invention, and do not constitute any limitation to the present invention.
As shown in fig. 1, the utility model discloses a battery energy storage structure through H bridge compensating circuit power control includes group battery, series connection equalizer circuit, H bridge compensating circuit, filter circuit and the controller of a plurality of series connections.
As shown in fig. 1, the series equalization circuit is used for controlling the charging current and the discharging current of each battery pack, adjusting the SOC equalization of each battery pack, and providing a stable dc power supply for the H-bridge compensation circuit; the H-bridge compensation circuit is used for adjusting the difference between the voltages of the battery pack and the direct-current bus so as to realize charge and discharge control; the filter circuit is used for filtering, so that the H-bridge compensation circuit outputs stable voltage for voltage difference compensation. The controller is used for controlling the working strategies of the series equalization circuit and the H-bridge compensation circuit.
As shown in fig. 1, the series equalization circuit includes a plurality of isolated bidirectional DC/DC converters, the input terminals of the bidirectional DC/DC converters are respectively connected to the battery packs, and the output terminals of the bidirectional DC/DC converters are respectively connected in series. The bidirectional DC/DC converter can adjust the output voltage of each battery pack, so that the output voltage of the battery pack with a large SOC value is increased, the output voltage of the battery pack with a small SOC value is decreased, and after the capacities of the battery packs are balanced, the output voltages of the battery packs are kept consistent, and therefore the independent control of each battery pack and the capacity balance of the battery packs can be realized.
As shown in fig. 1, the DC/DC converters have the same structure, and each of the DC/DC converters includes switching tubes K1, K2, K3, K4, K5, K6, K7, K8, inductors L1 and L2, capacitors C1 and C2, and a transformer. The drains of the switching tubes K1 and K2 and the sources of the switching tubes K3 and K4 are respectively connected to the positive end and the negative end of the battery pack; the source electrode of the switching tube K1 is connected with the drain electrode of the switching tube K3, and the common connection point of the switching tube K1 and the drain electrode of the switching tube K3 is connected with one end of the primary coil of the transformer through a capacitor C1 and an inductor L1; the source electrode of the switching tube K2 is connected with the drain electrode of the switching tube K4, and the common connection point of the switching tube K2 and the drain electrode of the switching tube K4 is connected with the other end of the primary coil of the transformer; two ends of the inductor L2 are respectively connected with two ends of a primary coil of the transformer; two ends of the capacitor C2 are respectively connected with the positive end and the negative end of the battery pack; the drains of the switching tubes K5 and K6 are connected with one end of a capacitor C3; the sources of the switching tubes K7 and K8 are connected with the other end of the capacitor C3; the source electrode of the switching tube K5 is connected with the drain electrode of the switching tube K7, and the common connection point of the switching tube K5 and the drain electrode of the switching tube K7 is connected with one end of the secondary coil of the transformer; the source of the switch K6 is connected to the drain of the switch tube K8, and the common connection point is connected to the other end of the secondary winding of the transformer. And the gates of the switching tubes K1, K2, K3, K4, K5, K6, K7 and K8 are respectively connected with the controller.
As shown in fig. 1, an input terminal of the H-bridge compensation circuit is connected to an output terminal of the series equalization circuit, and an output terminal thereof is connected to the filter circuit. The H-bridge compensation circuit comprises capacitors C4 and C5, switching tubes S1, S2, S3 and S4 and an inductor L3. The drains of the switch tubes S1 and S3 and the sources of the switch tubes S2 and S4 are respectively connected with the output end of the series equalization circuit; the source electrode of the switch tube S1 is connected with the drain electrode of the switch tube S2, and the common connection point of the switch tube S1 and the drain electrode of the switch tube S2 is connected with one end of an inductor L3; the source of the switch tube S3 is connected to the drain of the switch tube S4, the common connection point is connected to one end of a capacitor C5, and the other end of the capacitor C5One end of the inductor L3 is connected with the other end of the inductor L3; two ends of the capacitor C4 are respectively connected with the output end of the series equalization circuit. The gates of the switching tubes S1, S2, S3 and S4 are respectively connected with the controller. The input power supply of the H-bridge compensation circuit is a stable direct current power supply, and through the switching on and off of four switching tubes S1, S2, S3 and S4, the voltage between two points AB on a bridge arm can be in three states: + Vd，-Vd,0. Wherein, VdIs the output voltage of the series equalization circuit. When the bridge arms S1 and S4 are conducted, the voltage between the two points of the bridge arm AB is equal to + Vd. When the bridge arms S2 and S3 are conducted, the voltage between the two points of the bridge arm AB is equal to-Vd. When the bridge arms S1 and S3 or S2 and S4 are conducted, the voltage between the two points of the bridge arm AB is equal to 0. The control module can be used for conducting the same bridge arm switching tube in a complementary mode through pulse adjustment, so that the positive value and the negative value of the output voltage of the bridge arm switching tube are adjusted, and the voltage difference between the direct current bus and the battery pack is compensated through stable output of the positive level and the negative level.
As shown in fig. 1, the input terminal of the filter circuit is connected to the output terminal of the H-bridge compensation circuit and the output terminal of the battery pack; in this embodiment, the filter circuit is an LCL filter circuit, which includes a capacitor C6, an inductor L4, and an inductor L5; one end of the inductor L4 is connected with one end of the inductor L5, and the other end of the inductor L4 is connected with the common connection point of the switching tubes S3 and S4; one end of a capacitor C6 is connected with a common connection point of an inductor L4 and an inductor L5, and the other end of a capacitor C6 is connected with the anode of the battery pack and is connected with a common connection point of the inductor L3 and the capacitor C5.
The control module is used for realizing a charge and discharge control strategy, a reference value of a voltage difference is obtained by calculating the difference between a given output voltage instruction and a collected output voltage, then the difference is obtained with the collected actual voltage difference to obtain an inductance current reference value of the H-bridge compensation circuit, finally the inductance current reference value is compared with the collected inductance current of the H-bridge compensation circuit, then a modulation wave is generated to carry out carrier phase shift modulation, the voltage difference control between the battery pack and the direct current bus is realized, and the charge and discharge control of the system is finished.
For the utility model discloses a carry out power control's battery energy storage structure through H bridge compensating circuit, group battery charge-discharge current divide into two parts, and partly through series connection equalizer circuit's two-way DC converter, partly through series connection group battery circuit. The rated voltage of the whole battery pack is consistent with the voltage of the direct current bus, the capacity of each battery pack can be changed along with the charge and discharge operation of the battery pack, the output voltages of the battery packs with different SOCs are different, and therefore a smaller voltage difference is formed between the direct current bus and the battery packs. Because the voltage difference between the direct current bus and the battery pack is small, the power flowing through the series equalization circuit and the H-bridge compensation circuit is small, and the power capacity of the bidirectional DC/DC converter used for control is reduced. Because the voltage difference between the direct current bus and the series battery pack is positive or negative, the direction of the output current can be adjusted by controlling the H-bridge compensation circuit to output positive and negative levels for compensation. The utility model discloses introduce H bridge compensating circuit and come the control voltage difference, compare and control in directly with DC converter, can reduce equipment power capacity to in order to provide H bridge compensating circuit input power supply, two-way DC converter output current keeps invariable, and work efficiency also can obtain improving.
While the invention has been described with reference to the above embodiments, the scope of the invention is not limited thereto, and the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the concept of the invention.
Claims (6)
1. The utility model provides a carry out power control's battery energy storage structure through H bridge compensating circuit, its group battery that includes a plurality of series connection, the group battery includes the monomer battery of a plurality of series connections respectively, its characterized in that, it includes:
the series equalization circuit comprises a plurality of isolated bidirectional DC/DC converters, the input end of each bidirectional DC/DC converter is connected with each battery pack, and the output ends of the bidirectional DC/DC converters are connected in series;
the input end of the H-bridge compensation circuit is connected with the output end of the series equalization circuit and is used for compensating the voltage difference between the battery pack and the DC bus voltage to realize charge and discharge control;
the input end of the filter circuit is connected with the output end of the H-bridge compensation circuit and the output end of the battery pack;
and the controller is connected with the series equalization circuit and the H-bridge compensation circuit.
2. The battery energy storage structure for power control through the H-bridge compensation circuit according to claim 1, wherein the DC/DC converter comprises switching tubes K1, K2, K3, K4, K5, K6, K7, K8, inductors L1, L2, capacitors C1, C2 and a transformer
The drains of the switching tubes K1 and K2 and the sources of the switching tubes K3 and K4 are respectively connected to the positive end and the negative end of the battery pack;
the source electrode of the switching tube K1 is connected with the drain electrode of the switching tube K3, and the common connection point of the switching tube K1 and the drain electrode of the switching tube K3 is connected with one end of the primary coil of the transformer through a capacitor C1 and an inductor L1;
the source electrode of the switching tube K2 is connected with the drain electrode of the switching tube K4, and the common connection point of the switching tube K2 and the drain electrode of the switching tube K4 is connected with the other end of the primary coil of the transformer;
two ends of the inductor L2 are respectively connected with two ends of a primary coil of the transformer;
two ends of the capacitor C2 are respectively connected with the positive end and the negative end of the battery pack;
the drains of the switching tubes K5 and K6 are connected with one end of a capacitor C3; the sources of the switching tubes K7 and K8 are connected with the other end of the capacitor C3;
the source electrode of the switching tube K5 is connected with the drain electrode of the switching tube K7, and the common connection point of the switching tube K5 and the drain electrode of the switching tube K7 is connected with one end of the secondary coil of the transformer;
the source of the switch K6 is connected to the drain of the switch tube K8, and the common connection point is connected to the other end of the secondary winding of the transformer.
3. The battery energy storage structure for power control through the H-bridge compensation circuit according to claim 2, wherein the gates of the switching tubes K1, K2, K3, K4, K5, K6, K7, and K8 are respectively connected to the controller.
4. The battery energy storage structure for power control through the H-bridge compensation circuit of claim 2, wherein the H-bridge compensation circuit comprises capacitors C4, C5, switching tubes S1, S2, S3, S4, inductor L3,
the drains of the switch tubes S1 and S3 and the sources of the switch tubes S2 and S4 are respectively connected with the output end of the series equalization circuit;
the source electrode of the switch tube S1 is connected with the drain electrode of the switch tube S2, and the common connection point of the switch tube S1 and the drain electrode of the switch tube S2 is connected with one end of an inductor L3;
the source of the switch tube S3 is connected to the drain of the switch tube S4, the common connection point thereof is connected to one end of a capacitor C5, and the other end of the capacitor C5 is connected to the other end of the inductor L3;
two ends of the capacitor C4 are respectively connected with the output end of the series equalization circuit.
5. The battery energy storage structure for power control through the H-bridge compensation circuit of claim 4, wherein the filter circuit is an LCL filter circuit comprising a capacitor C6, an inductor L4, L5,
one end of the inductor L4 is connected with one end of the inductor L5, and the other end of the inductor L4 is connected with the common connection point of the switching tubes S3 and S4;
one end of a capacitor C6 is connected with a common connection point of an inductor L4 and an inductor L5, and the other end of a capacitor C6 is connected with the anode of the battery pack and is connected with a common connection point of the inductor L3 and the capacitor C5.
6. The battery energy storage structure for power control through the H-bridge compensation circuit according to claim 5, wherein the gates of the switching tubes S1, S2, S3, S4 are respectively connected with the controller.
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| CN202023033124.XU CN214045118U (en) | 2020-12-16 | 2020-12-16 | Battery energy storage structure for power control through H-bridge compensation circuit |
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| CN202023033124.XU CN214045118U (en) | 2020-12-16 | 2020-12-16 | Battery energy storage structure for power control through H-bridge compensation circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783251A (en) * | 2021-08-26 | 2021-12-10 | 四川科陆新能电气有限公司 | Virtual internal resistance adjusting circuit for balancing between battery clusters |
| CN113890155A (en) * | 2021-10-12 | 2022-01-04 | 燕山大学 | Direct current bus-oriented battery management system |
-
2020
- 2020-12-16 CN CN202023033124.XU patent/CN214045118U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783251A (en) * | 2021-08-26 | 2021-12-10 | 四川科陆新能电气有限公司 | Virtual internal resistance adjusting circuit for balancing between battery clusters |
| CN113783251B (en) * | 2021-08-26 | 2024-04-16 | 四川科陆新能电气有限公司 | Virtual internal resistance regulating circuit for balancing among battery clusters |
| CN113890155A (en) * | 2021-10-12 | 2022-01-04 | 燕山大学 | Direct current bus-oriented battery management system |
| CN113890155B (en) * | 2021-10-12 | 2024-02-09 | 燕山大学 | Battery management system for direct current bus |
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