CN114301107B - Positive and negative level energy storage system and control method thereof - Google Patents
Positive and negative level energy storage system and control method thereof Download PDFInfo
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- CN114301107B CN114301107B CN202111344825.1A CN202111344825A CN114301107B CN 114301107 B CN114301107 B CN 114301107B CN 202111344825 A CN202111344825 A CN 202111344825A CN 114301107 B CN114301107 B CN 114301107B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000001276 controlling effect Effects 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 3
- 101000908580 Homo sapiens Spliceosome RNA helicase DDX39B Proteins 0.000 description 16
- 102100024690 Spliceosome RNA helicase DDX39B Human genes 0.000 description 16
- 101001068634 Homo sapiens Protein PRRC2A Proteins 0.000 description 14
- 102100033954 Protein PRRC2A Human genes 0.000 description 14
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Abstract
The invention relates to a positive and negative level energy storage system and a control method thereof. The positive and negative level energy storage system comprises: the switching circuit, the first sub-battery cluster, the second sub-battery cluster and the charge-discharge circuit; the switch circuit is respectively connected with the first sub-battery cluster, the second sub-battery cluster and the charge-discharge circuit; the first sub-battery cluster is connected with the second sub-battery cluster to form a battery cluster with a center line; the first sub-battery cluster and the second sub-battery cluster are connected with the charge-discharge circuit; the switching circuit is used for regulating and controlling the voltages of the first sub-battery cluster and the second sub-battery cluster based on the charge and discharge signals collected by the charge and discharge circuit. The invention regulates and controls the positive and negative voltages output by the sub-battery clusters by adopting the switch circuit, so that the absolute values of the positive voltage and the negative voltage output are kept consistent, and the problems of inconsistent voltage and neutral-point voltage bias are essentially solved.
Description
Technical Field
The invention relates to the technical field of energy storage systems, in particular to a positive and negative level energy storage system and a control method thereof.
Background
The direct current system (shown in figure 1) with the N neutral line and positive and negative levels is suitable for a multi-level inverter. However, when the absolute value of the current in the lines p+ and N is different from the absolute value of the current in the lines P-and N-is, that is, the first to N-th battery modules are different from the n+1th battery modules to the n+n-th output currents, the absolute values are not equal, and at this time, when the p+ output power is consistent with the P-output power, the inconsistency of the differential pressure is aggravated, voltage distortion is caused to the inverter side, and thus the transformer end cannot work normally. In order to solve the problem, the prior art uses a midpoint voltage control method of a positive-negative level inverter to solve the problem of inconsistent voltage, but in a practical application scene, the problem of inconsistent voltage is caused by the problems of a control algorithm, inconsistent battery cells when the battery modules are connected in series, and the like, and the midpoint voltage control method cannot essentially solve the problem of midpoint voltage bias.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a positive and negative level energy storage system and a control method thereof.
In order to achieve the above object, the present invention provides the following solutions:
a positive and negative level energy storage system comprising: the switching circuit, the first sub-battery cluster, the second sub-battery cluster and the charge-discharge circuit;
the switch circuit is respectively connected with the first sub-battery cluster, the second sub-battery cluster and the charge-discharge circuit; the first sub-battery cluster is connected with the second sub-battery cluster to form a battery cluster with a center line; the first sub-battery cluster and the second sub-battery cluster are connected with the charge-discharge circuit;
the switching circuit is used for regulating and controlling the voltages of the first sub-battery cluster and the second sub-battery cluster based on the charge and discharge signals collected by the charge and discharge circuit.
Preferably, the switching circuit includes: the device comprises a switch unit, an energy storage unit and a control unit;
the switch unit is respectively connected with the energy storage unit, the control unit, the first sub-battery cluster and the second sub-battery cluster; the switch unit is used for switching according to the control instruction of the control unit; the energy storage unit is used for charging and discharging according to the opening and closing of the switch unit.
Preferably, the switching unit includes: a first switch, a second switch, a third switch and a fourth switch;
one end of the first switch and one end of the second switch are connected with one end of the energy storage unit; one end of the third switch and one end of the fourth switch are connected with the other end of the energy storage unit; the other end of the first switch is connected with the first sub-battery cluster and the charging and discharging circuit; the other end of the second switch and the other end of the third switch are connected to a connecting neutral line of the first sub-battery cluster and the second sub-battery cluster; the other end of the fourth switch is connected with the second sub-battery cluster and the charge-discharge circuit; the first switch, the second switch, the third switch and the fourth switch are all connected with the control unit.
Preferably, the energy storage unit is a capacitor.
Preferably, the first sub-battery cluster and the second sub-battery cluster are connected in series, and each of the first sub-battery cluster and the second sub-battery cluster comprises a battery management unit and n battery modules connected in series;
the other end of the first switch is connected with one end of a first battery module in the first sub-battery cluster; the other end of the second switch is respectively connected with one end of an nth battery module of the first sub-battery cluster and one end of a first battery module in the second sub-battery cluster; the other end of the third switch is respectively connected with one end of the nth battery module of the first sub-battery cluster and one end of the first battery module in the second sub-battery cluster; the other end of the fourth switch is connected with one end of an nth battery module in the second sub-battery cluster; the battery management unit is respectively connected with the battery module, the control unit and the charge-discharge circuit.
Preferably, the device further comprises a positive output end, a negative output end and a central end;
the positive output end and the negative output end are connected with the charge-discharge circuit; the center end is connected with a connection point of the first sub-battery cluster and the second sub-battery cluster.
Preferably, the charge/discharge circuit includes: the first shunt meter, the first diode, the second diode, the first contactor, the second shunt meter, the third diode, the fourth diode, the third contactor and the fourth contactor;
one end of the first shunt meter is connected with the other end of the first switch and one end of the first sub-battery cluster respectively; the other end of the first shunt meter is connected with the input end of the first diode; the first contactor is connected with the first diode in parallel; the output end of the first diode is connected with the output end of the second diode; the input end of the second diode is connected with the positive output end; the second contactor is connected with the second diode in parallel;
one end of the second shunt meter is connected with the other end of the fourth switch and one end of the second sub-battery cluster respectively; the other end of the second shunt meter is connected with the input end of the third diode; the output end of the third diode is connected with the output end of the fourth diode; the input end of the fourth diode is connected with the negative output end; the third diode is connected with the third contactor in parallel; the fourth diode is connected with the fourth contactor in parallel; the first shunt meter and the second shunt meter are both connected with the battery management unit.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the positive and negative level energy storage system provided by the invention, the positive and negative voltages output by the sub-battery clusters are regulated and controlled by adopting the switch circuit, so that the absolute values of the positive voltage and the negative voltage output are kept consistent, and the problems of inconsistent voltage and neutral-point voltage bias are essentially solved.
The invention also provides a control method of the positive and negative level energy storage system, which is applied to the positive and negative level energy storage system; the control method of the positive and negative level energy storage system comprises the following steps:
collecting total positive current signals and total negative current signals when the positive and negative level energy storage system is charged and discharged;
judging the relation between the total positive current signal and the total negative current signal;
generating a first control signal when the total positive current signal is greater than the total negative current signal;
the first switch and the third switch are controlled to be opened according to the first control signal, and the energy storage unit is charged;
generating a second control signal when the total positive current signal is less than the total negative current signal;
the second switch and the fourth switch are controlled to be opened according to the second control signal, and the energy storage unit discharges;
when the total positive current signal is equal to the total negative current signal, no operation is performed.
The technical effects achieved by the control method of the positive and negative level energy storage system are the same as those achieved by the positive and negative level energy storage system, so that the description is omitted here.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a topology of a positive and negative level energy storage system employed in the prior art;
FIG. 2 is a topology diagram of a positive and negative level energy storage system provided by the present invention;
fig. 3 is a flowchart of voltage equalization control by adopting a control method of a positive and negative energy storage system according to an embodiment of the present invention.
Reference numerals illustrate:
the device comprises a 1-charge-discharge circuit, a 2-battery cluster, a 3-switch circuit, a 4-energy storage unit and a 5-control unit.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a positive and negative level energy storage system and a control method thereof, which can essentially solve the problems of inconsistent voltage and neutral-point voltage bias.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 2, a positive and negative level energy storage system includes: a switching circuit 3, a first sub-battery cluster BAT1, a second sub-battery cluster BAT2, and a charge-discharge circuit 1.
The switching circuit 3 is connected to the first sub-battery cluster BAT1, the second sub-battery cluster BAT2, and the charge-discharge circuit 1, respectively. The first sub-battery cluster BAT1 is connected with the second sub-battery cluster BAT2 to form a battery cluster 2 with a center line. The first sub-battery cluster BAT1 and the second sub-battery cluster BAT2 are connected to the charge/discharge circuit 1.
The switching circuit 3 is used for regulating and controlling the voltages of the first sub-battery cluster BAT1 and the second sub-battery cluster BAT2 based on the charge and discharge signals collected by the charge and discharge circuit 1.
Wherein the switching circuit 3 comprises: a switching unit, an energy storage unit 4 and a control unit 5. A capacitor, a super capacitor, an inductor, a battery, or the like may be used as the energy storage unit 4.
The switching unit is connected with the energy storage unit 4, the control unit 5, the first sub-battery cluster BAT1 and the second sub-battery cluster BAT2, respectively. The switching unit is used for opening and closing according to the control instruction of the control unit 5. The energy storage unit 4 is used for charging and discharging according to the opening and closing of the switch unit. The control unit 5 can control the on and off of the switches in the switching circuit 3.
The switch unit adopted by the invention comprises: a first switch, a second switch, a third switch and a fourth switch. Wherein the first switch, the second switch, the third switch and the fourth switch may be any one of a MOSFET, an IGBT, a relay and a contactor.
One end of the first switch and one end of the second switch are connected with one end of the energy storage unit 4. One end of the third switch and one end of the fourth switch are both connected with the other end of the energy storage unit 4. The other end of the first switch is connected to the first sub-battery cluster BAT1 and the charge-discharge circuit 1. The other end of the second switch and the other end of the third switch are connected to the connection intermediate lines of the first and second sub-battery clusters BAT1 and BAT 2. The other end of the fourth switch is connected to the second sub-battery cluster BAT2 and the charge-discharge circuit 1. The first switch, the second switch, the third switch and the fourth switch are all connected with the control unit 5.
The first sub-battery cluster BAT1 and the second sub-battery cluster BAT2 are connected in series. And the first sub battery cluster BAT1 and the second sub battery cluster BAT2 each include a battery management unit and n battery modules connected in series. For example, the battery modules in the first sub-battery cluster BAT1 are 1 to n, and the battery modules in the second sub-battery cluster BAT2 are n+1 to n+n. Meanwhile, a battery management unit is arranged in the battery cluster 2, so that voltages of each battery module and battery cells in the battery modules can be collected, the battery cells are balanced according to the collected voltages, and voltages between the battery modules 1 to n and between n+1 to n+n can be respectively V+ and V-.
The other end of the first switch is connected with one end of a first battery module in the first sub-battery cluster BAT 1. The other end of the second switch is connected with one end of the nth battery module of the first sub-battery cluster BAT1 and one end of the first battery module of the second sub-battery cluster BAT2 respectively. The other end of the third switch is connected with one end of the nth battery module of the first sub-battery cluster BAT1 and one end of the first battery module of the second sub-battery cluster BAT2 respectively. The other end of the fourth switch is connected with one end of the nth battery module in the second sub-battery cluster BAT 2. The battery management unit is respectively connected with the battery module, the control unit 5 and the charge-discharge circuit 1.
The switching circuit 3 comprising energy storage elements serves to equalize the voltages V + and V-. As shown in fig. 2, when the voltage v+ is higher than the voltage V-, the first switch and the third switch are turned on, and the first sub-battery cluster BAT1 charges the capacitor, and the voltage of the capacitor is equal to v+. Then the first switch and the third switch are closed, the second switch and the fourth switch are turned on, and the capacitor discharges to the second sub-battery cluster BAT2, so that the purpose of transferring the battery pack with higher voltage in the battery cluster 2 to the sub-battery cluster power supply with lower voltage is achieved.
As another embodiment of the present invention, the positive and negative level energy storage system further includes a positive output terminal, a negative output terminal, and a center terminal.
The positive output end and the negative output end are both connected with the charge-discharge circuit 1. The center terminal is connected with a connection point of the first sub-battery cluster BAT1 and the second sub-battery cluster BAT 2.
Wherein, the charge-discharge circuit 1 includes: the first shunt meter R1, the first diode D1, the second diode D2, the first contactor S1, the second contactor S2, the second shunt meter R2, the third diode D4, the fourth diode D3, the third contactor S3 and the fourth contactor S4.
One end of the first shunt meter R1 is connected to the other end of the first switch and one end of the first sub-battery cluster BAT1, respectively. The other end of the first shunt meter R1 is connected with the input end of the first diode D1. The first contactor S1 is connected in parallel with the first diode D1. The output end of the first diode D1 is connected with the output end of the second diode D2. The input terminal of the second diode D2 is connected to the positive output terminal. The second contactor S2 is connected in parallel with the second diode D2.
One end of the second shunt meter R2 is connected to the other end of the fourth switch and one end of the second sub-battery cluster BAT2, respectively. The other end of the second shunt meter R2 is connected to the input of the third diode D4. The output terminal of the third diode D4 is connected to the output terminal of the fourth diode D3. The input terminal of the fourth diode D3 is connected to the negative output terminal. The third diode D4 is connected in parallel with the third contactor S3. The fourth diode D3 is connected in parallel with the fourth contactor S4. The first shunt meter R1 and the second shunt meter R2 are both connected with the battery management unit.
Specifically, the charge-discharge circuit 1 includes both a discharge circuit and a charge circuit. Wherein charging is performed by closing the first contactor S1 and the third contactor S3, and opening the first contactor S1 and the third contactor S3 closes the charging. By closing the second contactor S2 and the fourth contactor S4 to discharge, the second contactor S2 and the fourth contactor S4 are opened to stop the discharge. The shunt meters (the first shunt meter R1 and the second shunt meter R2) adopt total positive and total negative charge and discharge currents and are used for controlling equalization of the upper bridge arm battery pack and the lower bridge arm battery pack.
In the positive and negative level energy storage system provided by the above, when the voltages of the two sub-battery clusters formed by the battery modules are inconsistent, the switch circuit 3 controls the two sections of voltages in the battery cluster 2 to be consistent, so as to ensure the consistency of the positive and negative level voltages of the system. The concrete working mode is as follows:
the corresponding controllable switches are turned on when pins g_p+, g_n+, g_n-and g_p-in the control unit 5 are high and turned off when low.
When pins G_P+ and G_N+ of control unit 5 are high, pins G_N-and G_P-are low. Pins G_P+ and G_N+ are low when pins G_N-and G_P-are high.
When the pins G_P+ and G_N+ of the control unit 5 are in high level, the first switch and the third switch are conducted, and the capacitor voltage is equal to V+ after being charged.
When pins G_N-and G_P-are high, the second switch and the fourth switch are turned on, and the capacitor voltage will be equal to V-after charging.
Let the on-time be τ, the capacitance be C, and the resistance of the wire from the end of the battery cluster 2 to the energy storage unit 4 be R, then the on-time be τ=r×c. The capacitance is switched from V+ to V-with a time interval of 0.5τ.
The invention also provides a control method of the positive and negative level energy storage system, which is applied to the positive and negative level energy storage system; the control method of the positive and negative level energy storage system comprises the following steps:
collecting total positive current signals and total negative current signals when the positive and negative level energy storage system is charged and discharged;
judging the relation between the total positive current signal and the total negative current signal;
generating a first control signal when the total positive current signal is greater than the total negative current signal;
the first switch and the third switch are controlled to be opened according to the first control signal, and the energy storage unit is charged;
generating a second control signal when the total positive current signal is less than the total negative current signal;
the second switch and the fourth switch are controlled to be opened according to the second control signal, and the energy storage unit discharges;
when the total positive current signal is equal to the total negative current signal, no operation is performed.
The specific flow of implementing the control method of the positive and negative level energy storage system provided by the invention is shown in figure 3.
Based on the scheme, the invention can keep the voltage of the positive and negative level system formed by two sections of battery modules consistent through the switch circuit, and has the advantages of simple control method, simple structure and the like.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (3)
1. A positive and negative level energy storage system, comprising: the switching circuit, the first sub-battery cluster, the second sub-battery cluster, the charge-discharge circuit, the positive output end, the negative output end and the central end;
the switch circuit is respectively connected with the first sub-battery cluster, the second sub-battery cluster and the charge-discharge circuit; the first sub-battery cluster is connected with the second sub-battery cluster to form a battery cluster with a center line; the first sub-battery cluster and the second sub-battery cluster are connected with the charge-discharge circuit;
the switching circuit is used for regulating and controlling the voltages of the first sub-battery cluster and the second sub-battery cluster based on charge and discharge signals acquired by the charge and discharge circuit;
the switching circuit includes: the device comprises a switch unit, an energy storage unit and a control unit;
the switch unit is respectively connected with the energy storage unit, the control unit, the first sub-battery cluster and the second sub-battery cluster; the switch unit is used for switching according to the control instruction of the control unit; the energy storage unit is used for charging and discharging according to the opening and closing of the switch unit;
the switching unit includes: a first switch, a second switch, a third switch and a fourth switch;
one end of the first switch and one end of the second switch are connected with one end of the energy storage unit; one end of the third switch and one end of the fourth switch are connected with the other end of the energy storage unit; the other end of the first switch is connected with the first sub-battery cluster and the charging and discharging circuit; the other end of the second switch and the other end of the third switch are connected to a connecting neutral line of the first sub-battery cluster and the second sub-battery cluster; the other end of the fourth switch is connected with the second sub-battery cluster and the charge-discharge circuit; the first switch, the second switch, the third switch and the fourth switch are all connected with the control unit;
the positive output end and the negative output end are connected with the charge-discharge circuit; the center end is connected with the connection point of the first sub-battery cluster and the second sub-battery cluster;
the charge/discharge circuit includes: the first shunt meter, the first diode, the second diode, the first contactor, the second shunt meter, the third diode, the fourth diode, the third contactor and the fourth contactor;
one end of the first shunt meter is connected with the other end of the first switch and one end of the first sub-battery cluster respectively; the other end of the first shunt meter is connected with the input end of the first diode; the first contactor is connected with the first diode in parallel; the output end of the first diode is connected with the output end of the second diode; the input end of the second diode is connected with the positive output end; the second contactor is connected with the second diode in parallel; the first diode and the second diode are connected in a reverse direction;
one end of the second shunt meter is connected with the other end of the fourth switch and one end of the second sub-battery cluster respectively; the other end of the second shunt meter is connected with the input end of the third diode; the output end of the third diode is connected with the output end of the fourth diode; the input end of the fourth diode is connected with the negative output end; the third diode is connected with the third contactor in parallel; the fourth diode is connected with the fourth contactor in parallel; the first shunt meter and the second shunt meter are connected with a battery management unit; the third diode and the fourth diode are connected in reverse;
the process for controlling the positive and negative level energy storage system comprises the following steps:
collecting total positive current signals and total negative current signals when the positive and negative level energy storage system is charged and discharged;
judging the relation between the total positive current signal and the total negative current signal;
generating a first control signal when the total positive current signal is greater than the total negative current signal;
the first switch and the third switch are controlled to be opened according to the first control signal, and the energy storage unit is charged;
generating a second control signal when the total positive current signal is less than the total negative current signal;
the second switch and the fourth switch are controlled to be opened according to the second control signal, and the energy storage unit discharges;
when the total positive current signal is equal to the total negative current signal, no operation is performed.
2. The positive and negative level energy storage system of claim 1, wherein said energy storage unit is a capacitor.
3. The positive and negative level energy storage system of claim 1, wherein the first and second sub-battery clusters are connected in series, and wherein the first and second sub-battery clusters each comprise a battery management unit and n series-connected battery modules;
the other end of the first switch is connected with one end of a first battery module in the first sub-battery cluster; the other end of the second switch is respectively connected with one end of an nth battery module of the first sub-battery cluster and one end of a first battery module in the second sub-battery cluster; the other end of the third switch is respectively connected with one end of the nth battery module of the first sub-battery cluster and one end of the first battery module in the second sub-battery cluster; the other end of the fourth switch is connected with one end of an nth battery module in the second sub-battery cluster; the battery management unit is respectively connected with the battery module, the control unit and the charge-discharge circuit.
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