CN109301812B - Multi-module parallel DCDC control method based on retired battery - Google Patents
Multi-module parallel DCDC control method based on retired battery Download PDFInfo
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- CN109301812B CN109301812B CN201811447228.XA CN201811447228A CN109301812B CN 109301812 B CN109301812 B CN 109301812B CN 201811447228 A CN201811447228 A CN 201811447228A CN 109301812 B CN109301812 B CN 109301812B
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention relates to the technical field of electrical control, in particular to a multi-module parallel DCDC control method based on retired batteries. Compared with the prior art, the invention realizes the current equalization and the individual control of the battery packs by connecting a single battery pack of the energy storage system of the retired battery in series with the DCDC converter and then connecting the battery packs in parallel and combining the corresponding control strategy, and reduces the influence on the system caused by the inconsistency of the retired battery.
Description
Technical Field
The invention relates to the technical field of electrical control, in particular to a multi-module parallel DCDC control method based on retired batteries.
Background
When the capacity of the power battery of the electric automobile is reduced to 80%, the power battery is not suitable for being continuously used on the electric automobile.
At present, there are two possible treatment methods, one is directly used as industrial waste to be scrapped and disassembled. Another way is to retire the batteries for echelon utilization. Although the retired power batteries do not meet the use conditions of automobiles, certain residual energy still exists, and the energy of the batteries can completely and continuously meet the use requirements of household energy storage, distributed power generation, mobile power sources and the like.
However, the retired battery is different from a new battery, and the problems of poor consistency, high failure rate and the like exist. This has a large impact on the stable operation of the energy storage system. Meanwhile, new requirements are put forward on a control method and a system of the energy storage converter.
The control method and system of the traditional energy storage converter PCS are based on connecting a plurality of groups of batteries in series and parallel to the direct current side of the energy storage converter, and refer to fig. 1. However, due to the inconsistency of the retired batteries, for example, when the capacity of a certain battery pack is much lower than that of other battery packs, the charging and discharging capacities of the whole system are seriously affected. And the failure rate of the retired battery is high, so that the whole system cannot normally operate.
In summary, the control method and system for the conventional energy storage converter of the retired battery have the following defects: 1) the problem of inconsistency of the retired battery affects the reliable operation of the energy storage system; 2) the current sharing of each battery pack cannot be realized; 3) individual control of each battery pack cannot be achieved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, the influence of the inconsistency of the retired battery on a system is reduced by connecting a DCDC converter in each battery pack in series and then connecting the batteries in parallel, a corresponding control strategy is provided on the basis, the battery pack current equalization and independent control are realized, and the influence of the inconsistency of the retired battery on the system is further reduced.
In order to achieve the purpose, the design method of the multi-module parallel DCDC control based on the retired battery comprises the following steps: the output end of each battery pack is connected with the DCDC converter in series and then connected to the direct current bus in parallel, and the following control method is adopted:
(1) determining the number k of the DCDC converters which are on line currently and can be controlled independently;
(2) collecting the voltage U of each battery pack connected with the on-line DCDC converterkOutput current I of each battery packkAnd a DC bus voltage sampling value Ubus(ii) a K is an integer more than or equal to 1;
(3) according to the given value U of the DC bus voltage0And a DC bus voltage sampling value UbusCalculating the DC bus voltage error value eu＝U0-Ubus；
(4) According to the DC bus voltage error value euGenerating a current error adjustment value ei；
(5) According to a given power P0Calculating the current-sharing given value of the battery
(6) According to the given value I of the current equalizing current of the battery0And sampling value I of output current of each battery packkCalculating the current error value e of each battery packik＝I0-Ik；
(7) Adjusting the value e according to the current erroriAnd a current error value e of each battery packikCalculating the input error value e of the pulse width modulator of each battery packk＝eik+ei；
(8) According to the input error value e of each battery pack pulse width regulatorkGenerating a pulse width adjusting signal and outputting the pulse width adjusting signal to the base electrode of a DCDC converter switching tube in each battery pack to stabilize the voltage of a direct current bus at a given voltage value U0The output current of each battery pack is stabilized at a given current value I0。
Further, the determination logic for confirming that the DCDC converter is online and can be controlled independently in step (1) includes a charging state logic and a discharging state logic.
Further, the charge state logic is: when the battery pack is in a charging state, if the battery pack does not exit the system, the battery pack has no fault alarm, the electric quantity of the battery pack does not reach the highest electric quantity and the battery pack is allowed to be independently controlled to be charged, the DCDC converter is considered to be online and can be independently controlled.
Further, the discharge state logic is: when the battery pack is in a discharging state, if the battery pack does not exit the system, the battery pack has no fault alarm, the electric quantity of the battery pack does not reach the lowest electric quantity and the battery pack is allowed to be controlled to discharge independently, the DCDC converter is considered to be online and can be controlled independently.
Further, a signal for judging that the battery pack does not exit the system is output by a hot plug module in the DCDC converter.
Further, the fault alarm comprises a battery fault and a DCDC converter fault; the electric quantity of the battery is judged by the voltage and the pressure difference of the single battery pack.
Further, in the step (4), the method further includes the step of correcting the dc bus voltage error value euPerforming PID control operation to generate a current error adjustment value, wherein the proportional integral derivative operation formula is as follows:
wherein R istIs the output value, etIs an input voltage error value, kP、Ti、TdIs a parameter; error value e in step (4)uIs etAdjustment value of current error eiIs Rt。
Further, in step (8), inputting an error value e of each battery pack pulse width regulator calculated in step (7)kAs e in the PID formulatAnd respectively calculating corresponding pulse width adjusting values, and outputting the pulse width adjusting values to the base electrode of the switching tube of the DCDC converter in each battery pack.
Furthermore, the direct current bus is connected with a load through the PCS.
Compared with the prior art, the energy storage system of the retired battery has the advantages that the mode that the plurality of battery packs are directly connected in parallel is changed into the mode that a single battery pack is connected with the DCDC converter in series and then connected in parallel, so that the influence on the system due to the inconsistency of the retired battery is reduced; and a control strategy is provided on the basis of the structure, so that the current equalization and the independent control of the battery pack can be realized, and the influence on the system due to the inconsistency of the retired batteries is further reduced.
Drawings
FIG. 1 is a schematic diagram of a connection block of a prior art energy storage system;
FIG. 2 is a schematic view of a connection block of the energy storage system of the present invention;
fig. 3 is a flow chart of a control method in the present invention.
Fig. 4 is a schematic diagram of a connection block of the energy storage system in the embodiment of the invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and examples.
Example 1
Referring to fig. 2, the invention relates to a multi-module parallel DCDC control method based on retired batteries, which comprises the following steps: the output end of each battery pack is connected with the DCDC converter in series and then is connected to the direct current bus in parallel; in the scheme, if the output of the energy storage system is direct current, the direct current bus can be directly connected with a load; if the energy storage system outputs alternating current, an inverter PCS needs to be arranged between a direct current bus and a load.
Referring to fig. 3 and 4, the following control method is adopted to realize the individual control of each battery pack, make the current of each battery pack the same and make the switching of each battery pack not affect the power output. The PCS is now described in detail by way of example to connect 4 battery packs. There are 27 cells in each stack. The power of each DCDC converter is 2 kW. The DC bus voltage is 48V, and the single-phase AC output is 220V. After the system is started, the number of the online groups of the battery pack is firstly detected, including whether the battery pack is accessed to the system, whether a fault alarm exists, and whether charging and discharging are allowed. And then waiting for charge and discharge and power commands, or automatically carrying out charge and discharge according to the peak and valley of the electricity price. During operation, specifically, the background control system issues a charging command to the energy storage system, and the power is 3kW, and then the following processing steps are performed:
(1) the system detects the number of the online groups of the batteries in the charging mode, for example, 4 groups of batteries are connected into the system, no fault alarm is carried out, and charging and discharging are allowed. But the 4 th group battery reaches the highest electric quantity and can not be recharged, the online group number in the charging mode is 3;
(2) sampling 3 battery pack voltages U1＝92V、U2＝86V、U388V, the current I output by each battery pack1＝0A、I2＝0A、I30A and a DC bus voltage Ubus＝0V；
(3) Calculating given value U of DC bus voltagebusr48V and DC bus voltage sampling value UbusError value e ofu；
(4) According to the above-mentioned DC bus voltage error value euAnd generating a current error adjustment value ei1 is ═ 1; further, in this step, the method also includes the step of countingThe DC bus voltage error value euPerforming PID control operation to generate a current error adjustment value, wherein the proportional integral derivative operation formula is as follows:
wherein R istIs the output value, etIs an input voltage error value, kP、Ti、TdAs a parameter, so that the error value e is found in this stepuIs etAdjustment value of current error eiIs Rt；
(5) According to a given power P0Calculating the current-sharing given value of the battery
(6) According to the battery current-sharing given value 11.28A and each battery pack output current sampling value I1＝0A、I2＝0A、I3Calculating error value e of each battery pack as 0Aik；
(7) Adjusting the value e according to the current erroriAnd a current error value e of each battery packikCalculating the input error value e of the pulse width modulator of each battery packk＝eik+ei；
(8) According to the input error e of each battery pulse width regulatorkGenerating a pulse width adjusting signal and outputting the pulse width adjusting signal to the base electrodes of the switching tubes of the DCDC converters numbered 1, 2 and 3; further, the step (7) further comprises inputting an error value e of each battery pack pulse width regulator calculated in the step (7)kAs e in the PID formulatRespectively calculating corresponding pulse width adjusting values, and outputting the pulse width adjusting values to the base electrode of a switching tube of a DCDC converter in each battery pack;
(9) the system repeatedly executes the steps (2) to (8) to stabilize the voltage of the direct current bus at the given voltage value U0The output current of each battery pack is stabilized at a given current value I0；
(10) When one battery pack is failed or is fully charged in the charging process, the number of the online groups of the battery packs is automatically changed to be 2, and 3kW of power is distributed to the online 2 battery packs according to the step of the step (6).
The discharge mode is similar to the charge mode described above, with only the command to charge and discharge being different.
In this case, it is confirmed that the DCDC converter is online and the determination logic that can be controlled independently includes a charging state logic and a discharging state logic.
Further, the charge state logic is: when the battery pack is in a charging state, if the battery pack does not exit the system, the battery pack has no fault alarm, the electric quantity of the battery pack does not reach the highest electric quantity and the battery pack is allowed to be independently controlled to be charged, the DCDC converter is considered to be online and can be independently controlled.
The discharge state logic is: when the battery pack is in a discharging state, if the battery pack does not exit the system, the battery pack has no fault alarm, the electric quantity of the battery pack does not reach the lowest electric quantity and the battery pack is allowed to be controlled to discharge independently, the DCDC converter is considered to be online and can be controlled independently.
The fault alarm comprises a battery fault and a DCDC converter fault; the electric quantity of the battery is judged by the voltage and the pressure difference of the single battery pack.
Further, a signal for judging that the battery pack does not exit the system is output by a hot plug module in the DCDC converter.
Claims (7)
1. A multi-module parallel DCDC control method based on retired batteries is characterized by comprising the following steps,
the output end of each battery pack is connected with the DCDC converter in series and then connected to the direct current bus in parallel, and the following control method is adopted:
(1) determining the number k of the current on-line DCDC converters;
(2) collecting the voltage U of each battery pack connected with the on-line DCDC converterkOutput current I of each battery packkAnd a DC bus voltage sampling value Ubus(ii) a K is an integer more than or equal to 1;
(3) according to the DC bus voltageConstant value U0And a DC bus voltage sampling value UbusCalculating the DC bus voltage error value
；
(4) According to the DC bus voltage error value
Generating a current error adjustment value
(ii) a Further, in this step, the method further includes the step of correcting the dc bus voltage error value
Performing PID control operation to generate a current error adjustment value, wherein the proportional integral derivative operation formula is as follows:
wherein
Is the value of the output of the digital signal,
as an input value of the voltage error,
、
、
as a parameter, so that the error value in this step
Is composed of
Current error adjustment value
Is composed of
；
(5) According to given power
Calculating the current-sharing given value of the battery
；
(6) Setting the current according to the current-sharing current of the battery
And sampling value of output current of each battery pack
Calculating the current error value of each battery pack
；
(7) Adjusting the value according to the current error
And a current error value of each battery pack
Calculating the input error value of the pulse width modulator of each battery pack
；
(8) Inputting error value according to pulse width regulator of each battery pack
Generating pulse width adjusting signal and outputting the signal to the base of the switch tube of the DCDC converter in each battery pack to stabilize the DC bus voltage at the given voltage value
The output current of each battery pack is stabilized at a given current value
。
2. The method according to claim 1, wherein the determination logic for determining that the DCDC converter is online and can be controlled independently in step (1) comprises a charging state logic and a discharging state logic, and the charging state logic is: when the battery pack is in a charging state, if the battery pack does not exit the system, the battery pack has no fault alarm, the electric quantity of the battery pack does not reach the highest electric quantity and the battery pack is allowed to be controlled to be charged independently, the DCDC converter is considered to be online and can be controlled independently; the discharge state logic is: when the battery pack is in a discharging state, if the battery pack does not exit the system, the battery pack has no fault alarm, the electric quantity of the battery pack does not reach the lowest electric quantity and the battery pack is allowed to be controlled to discharge independently, the DCDC converter is considered to be online and can be controlled independently.
3. The method according to claim 2, wherein the signal for determining that the battery pack does not exit the system is output from a hot plug module in the DCDC converter.
4. The decommissioned battery-based multi-module parallel DCDC control method of claim 2, wherein the fault alarms comprise a battery fault and a DCDC converter fault; the electric quantity of the battery is judged by the voltage and the pressure difference of the single battery pack.
5. The method according to claim 1, wherein the step (4) further comprises comparing the DC bus voltage error value with the DC bus voltage error value
Performing PID control operation to generate a current error adjustment value, wherein the proportional integral derivative operation formula is as follows:
wherein
Is the value of the output of the digital signal,
as an input value of the voltage error,
、
、
is a parameter; error value in step (4)
Is composed of
Current error adjustment value
Is composed of
。
6. The decommissioned battery-based multi-module parallel DCDC control method according to claim 5, wherein in step (8), the pulse width modulator input error value of each battery pack calculated in step (7) is determined
As in the formula of PID operation
And respectively calculating corresponding pulse width adjusting values, and outputting the pulse width adjusting values to the base electrode of the switching tube of the DCDC converter in each battery pack.
7. The method for controlling the multi-module parallel DCDC based on the retired battery as claimed in claim 1, wherein the DC bus is connected to the load through the PCS.
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| CN110970969B (en) * | 2019-11-01 | 2021-10-15 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Alternate rest balance topology and control method of lithium ion power battery for electric ship |
| CN111106616B (en) * | 2020-01-08 | 2024-02-09 | 上海煦达新能源科技有限公司 | String architecture hybrid battery energy storage system for stabilizing output of photovoltaic power station |
| CN113872258A (en) * | 2020-06-30 | 2021-12-31 | 比亚迪股份有限公司 | Battery current-sharing control method and battery current-sharing control system |
| CN112104053A (en) * | 2020-09-24 | 2020-12-18 | 南方电网综合能源股份有限公司 | Converter system for retired power battery, control method thereof and storage medium |
| CN112531649B (en) * | 2020-12-07 | 2023-02-07 | 厦门市爱维达电子有限公司 | Control method for storage battery sharing manager |
| CN113555929B (en) * | 2021-07-15 | 2022-06-21 | 长沙理工大学 | Retired battery energy storage system considering risks and optimal scheduling method thereof |
| CN114513036B (en) * | 2022-04-19 | 2022-07-19 | 深圳市德兰明海科技有限公司 | Portable energy storage power supply parallel packaging system and method |
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