CN112736951A - Retired battery echelon utilization system and method based on multi-level energy storage type converter - Google Patents
Retired battery echelon utilization system and method based on multi-level energy storage type converter Download PDFInfo
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- CN112736951A CN112736951A CN202011579494.5A CN202011579494A CN112736951A CN 112736951 A CN112736951 A CN 112736951A CN 202011579494 A CN202011579494 A CN 202011579494A CN 112736951 A CN112736951 A CN 112736951A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a retired battery echelon utilization system and a retired battery echelon utilization method based on a multilevel energy storage type converter, wherein the retired battery echelon utilization system comprises a DC/DC control module, a half-bridge control module, a delta SOC detection module, two current detection modules and three voltage detection modules, the DC/DC control module is connected with a first voltage acquisition module, a second current detection module and the delta SOC module and used for generating and controlling a DC/DC boost circuit control signal, and the half-bridge control module is connected with a second voltage acquisition module, a third voltage acquisition module and the first current acquisition module and used for generating and controlling a half-bridge circuit switch control signal. According to the invention, the DC/DC booster circuit is used for controlling the output power of the battery pack, the half-bridge circuit is used for controlling the capacitance voltage balance among the submodules, and the output power distribution among the battery packs with different SOH characteristics is realized, so that the SOH characteristics of the battery packs tend to be consistent, and the overall service life of the retired battery pack is prolonged.
Description
Technical Field
The invention belongs to the technical field of energy storage, relates to a multilevel energy storage type converter, and particularly relates to a retired battery echelon utilization system and method based on the multilevel energy storage type converter.
Background
The gradual increase of energy crisis and environmental problems has led to the annual increase in the number of new energy vehicles. As an important energy supply part of a new energy automobile, the utilization efficiency of an energy storage battery is important to the service life of the electric automobile. At present, when the capacity of an energy storage battery in an electric automobile is attenuated to 80% of the rated value, the energy storage battery is eliminated, and the residual battery energy is difficult to be fully utilized.
Because the battery standards of different new energy automobile manufacturers are different, technical and economic problems exist in disassembling and recombining the retired battery, and therefore, how to improve the echelon utilization efficiency of the retired battery pack is a problem which needs to be solved urgently at present
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for using the retired battery echelon based on a multilevel energy storage converter, which are reasonable in design and can effectively improve the echelon use efficiency of a retired battery pack.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a retired battery echelon utilization system based on a multi-level energy storage type converter comprises a first current detection module, a second current detection module, a delta SOC detection module, a first voltage detection module, a second voltage detection module, a third voltage detection module, a DC/DC control module and a half-bridge control module.
The delta SOC module is connected with the submodule battery pack and used for measuring the SOC change value of each battery pack and transmitting the SOC change value to the DC/DC control module;
the first voltage acquisition module is connected with the sub-module battery pack and used for acquiring a voltage value of the battery pack and transmitting the voltage value to the DC/DC control module;
the second current detection module is connected with the submodule DC/DC booster circuit inductor L and used for collecting a current value flowing on the inductor L and transmitting the current value to the DC/DC control module;
the DC/DC control module is connected with the first voltage acquisition module, the second current detection module and the delta SOC module and is used for generating a DC/DC booster circuit switch T1Control signal and switch T2Controlling the signal and controlling the signal;
the second voltage detection module is connected with the sub-module capacitor and used for collecting a capacitor voltage value and transmitting the capacitor voltage value to the half-bridge control module;
the first current detection module is connected with the alternating current output side and used for collecting a current value of the alternating current output side and transmitting the current value to the half-bridge control module;
the third voltage acquisition module is connected with the alternating current output side and used for acquiring a voltage value of the alternating current side and transmitting the voltage value to the half-bridge control module;
the half-bridge control module is connected with the second voltage acquisition module, the third voltage acquisition module and the first current acquisition module and used for generating a half-bridge circuit switch T3Control signals andswitch T4Control signals and control them.
The multilevel energy storage type converter comprises six three-phase bridge arms, each phase of bridge arm consists of an upper group of bridge arms, a lower group of bridge arms and a filter connected with the upper group of bridge arms, each phase of bridge arm consists of N sub-modules connected in series, each bridge arm sub-module consists of a battery pack, a capacitor, a DC/DC booster circuit and a half-bridge circuit part which are connected in parallel, and the battery pack comprises a BMS equalizing circuit.
Furthermore, the control method of the DC/DC control module is: obtaining the output power reference P of the ith x-phase sub-module according to the distribution condition of delta SOC in inverse proportionrefxi(ii) a Wherein x is A, B, C, i is 1-2N; using output power reference PrefxiAnd the voltage V of the battery packbatThe inductive current reference i can be obtainedLref(ii) a Comparing inductor current reference iLrefAnd detecting the current iLAnd obtaining a control signal of the DC/DC booster circuit.
Moreover, the control method of the half-bridge control module comprises the following steps: according to the output power reference PrefAnd an AC output voltage VxTo obtain an AC output current reference iref(ii) a Comparing AC output current reference irefAnd carrying out PI modulation on the detected alternating current output current i to obtain a submodule control signal Mxi(ii) a Calculating the average value V of the capacitor voltages of all the sub-modulescrefAnd is in parallel with the actual capacitor voltage VxiComparing to obtain an adjustment control signal Txi(ii) a Superimposing submodule control signals MxiAnd adjusting the control signal TxiAnd obtaining a half-bridge circuit control signal.
A method for a retired battery echelon utilization system based on a multi-level energy storage converter comprises the following steps:
step 1, setting the same duty ratio for all switches in the multi-level energy storage type converter, and measuring the SOC change value of each battery pack by using a delta SOC module after outputting certain power;
step 2, according to the inverse ratio of delta SOC, the output power is referred to PrefDistributing and determining the output power P of each sub-module battery packrefxi；
Step 3, utilizing the output power P of the sub-module battery packrefxiThe reference current L flowing through the inductor L in the DC/DC booster circuit is obtained through the output of the first voltage detection moduleref；
Step 4, utilizing the reference current L flowing through the inductor LrefAnd the second current detection module outputs the current to the DC/DC control module to obtain a switch T2Duty cycle of, switch T1Duty ratio of (1) and T2Complementary, DC/DC control module switches T through boost circuit1Duty cycle of and switch T2As a control signal to control it;
step 5, utilizing output power reference PrefAnd a third voltage detection module for obtaining an AC output current reference iref；
Step 6, measuring all capacitor voltages by using a second voltage detection module, and solving the average value V of all capacitor voltagescref；
Step 7, averaging all capacitor voltages VcrefA second voltage detection module, an AC output current reference irefThe first current detection module outputs to the half-bridge control module to obtain a switch T3Duty cycle of, switch T4Duty ratio of (1) and T3Complementary, half-bridge control module switches T through half-bridge circuit3Duty cycle of and switch T4As a control signal to switch it.
The invention has the advantages and positive effects that:
1. the invention has reasonable design, determines the SOH difference characteristic among the battery packs by detecting the output characteristic delta SOC ratio among the battery packs under the same output power, and further calculates the output power reference of each battery pack. The DC/DC booster circuit is used for controlling the output power of the battery pack, the half-bridge circuit is used for controlling the capacitance voltage balance among the submodules, and the output power distribution among the battery packs with different SOH characteristics is realized, namely, each battery pack performs power regulation according to the SOH of each battery pack, so that the SOH characteristics of each battery pack tend to be consistent, and the echelon utilization efficiency of the retired battery pack is improved.
2. The invention takes the battery pack unit as a control target, dispersedly accesses to the multi-level energy storage type converter submodule, utilizes interphase circulating current control and submodule monomer modulation depth control, takes State of Health (SOH) balance as a control target, and is greatly beneficial to improving the echelon utilization efficiency of the retired battery and improving the energy utilization efficiency.
Drawings
FIG. 1 is a multilevel energy storage converter topology;
FIG. 2 is a connection diagram of the retired battery echelon utilization system based on the multilevel energy storage converter of the present invention;
FIG. 3 is a DC/DC boost circuit control strategy;
fig. 4 shows a half-bridge circuit part control strategy.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention controls the topology of a multilevel energy storage type converter shown in figure 1, the multilevel energy storage type converter comprises six groups of three-phase bridge arms, each phase of bridge arm consists of an upper group of bridge arms, a lower group of bridge arms and a filter connected with the upper group of bridge arms, each group of bridge arms consists of N sub-modules which are connected in series, each bridge arm sub-module consists of a battery pack, a capacitor, a DC/DC booster circuit and a half-bridge circuit which are partially connected in parallel, and the battery pack comprises a BMS equalizing circuit.
The retired battery echelon utilization system based on the multilevel energy storage type converter comprises a first current detection module, a second current detection module, a delta SOC detection module, a first voltage detection module, a second voltage detection module, a third voltage detection module, a DC/DC control module and a half-bridge control module, wherein the delta SOC detection module is used for detecting delta SOC of a battery, and the half-bridge control module is used for controlling the half-bridge control module to work in a half-bridge mode.
And the delta SOC module is connected with the submodule battery pack and used for measuring the SOC change value of each battery pack and transmitting the SOC change value to the DC/DC control module.
The first voltage acquisition module is connected with the sub-module battery pack and used for acquiring a voltage value of the battery pack and transmitting the voltage value to the DC/DC control module.
The second current detection module is connected with the submodule DC/DC booster circuit inductor L and used for collecting a current value flowing on the inductor L and transmitting the current value to the DC/DC control module.
The DC/DC control module is connected with the first voltage acquisition module, the second current detection module and the delta SOC module and is used for generating a DC/DC booster circuit switch T1Control signal and switch T2Control signals and control them.
The second voltage detection module is connected with the sub-module capacitor and used for collecting a capacitor voltage value and transmitting the capacitor voltage value to the half-bridge control module;
the first current detection module is connected with the alternating current output side and used for collecting a current value of the alternating current output side and transmitting the current value to the half-bridge control module;
and the third voltage acquisition module is connected with the alternating current output side and used for acquiring the voltage value of the alternating current side and transmitting the voltage value to the half-bridge control module.
The half-bridge control module is connected with the second voltage acquisition module, the third voltage acquisition module and the first current acquisition module and used for generating a half-bridge circuit switch T3Control signal and switch T4Control signals and control them.
Based on the retired battery echelon utilization system based on the multi-level energy storage converter, the invention also provides a retired battery echelon utilization method based on the multi-level energy storage converter, which is realized by a delta SOC detection module and an output power reference PrefThe output of the first voltage detection module is used for obtaining a DC/DC booster circuit switch T1、T2The motion signal of (2); output power reference P using a second voltage detection modulerefThe output of the first voltage detection module and the output of the first current detection module are used for obtaining a half-bridge circuit T3、T4The motion signal of (2). The method specifically comprises the following steps:
step 1, setting the same duty ratio for all switches in the multilevel energy storage type converter, and measuring the SOC change value of each battery pack by using a delta SOC module after outputting certain power.
Step 2, according to the inverse ratio of delta SOC, the output power is referred to PrefDistributing and determining the output power P of each sub-module battery packrefxi。
Step 3,Output power P using sub-module battery packrefxiThe reference current L flowing through the inductor L in the DC/DC booster circuit is obtained through the output of the first voltage detection moduleref。
Step 4, utilizing the reference current L flowing through the inductor LrefAnd the second current detection module outputs the current to the DC/DC control module to obtain a switch T2Duty cycle (control signal) of, switch T1Duty ratio of (1) and T2Complementary, DC/DC control module switches T through boost circuit1And T2Which is controlled by the control signal.
Step 5, utilizing output power reference PrefAnd a third voltage detection module for obtaining an AC output current reference iref。
Step 6, measuring all capacitor voltages by using a second voltage detection module, and solving the average value V of all capacitor voltagescref。
Step 7, averaging all capacitor voltages VcrefA second voltage detection module, an AC output current reference irefThe first current detection module outputs to the half-bridge control module to obtain a switch T3Duty cycle (control signal) of, switch T4Duty ratio of (1) and T3Complementary, half-bridge control module switches T through half-bridge circuit3And T4Which is controlled by the control signal.
In the control principle of the DC/DC boost circuit of the present invention, as shown in fig. 3, the output power reference P of the ith (i-1-2N) sub-module of x (x-a, B, C) phase is obtained in inverse proportion according to the Δ SOC distributionrefxi. By PrefxiAnd the voltage V of the battery packbatThe inductive current reference i can be obtainedLref. Comparison iLrefAnd detecting the current iLAnd obtaining a control signal of the DC/DC booster circuit.
The control principle of the half-bridge circuit, as shown in FIG. 4, depends on the output power reference PrefAnd an AC output voltage VxTo obtain an AC output current reference iref. Comparison irefAnd carrying out PI modulation on the detected alternating current output current i to obtain a submodule control signal Mxi. Calculating all sub-module capacitancesAverage voltage value VcrefAnd is in parallel with the actual capacitor voltage VxiComparing to obtain an adjustment control signal Txi. Superposition MxiAnd TxiAnd obtaining a half-bridge circuit control signal.
Nothing in this specification is said to apply to the prior art.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.
Claims (5)
1. The utility model provides a retired battery echelon utilization system based on many level energy storage converter which characterized in that: the power supply comprises a first current detection module, a second current detection module, a delta SOC detection module, a first voltage detection module, a second voltage detection module, a third voltage detection module, a DC/DC control module and a half-bridge control module.
The delta SOC module is connected with the submodule battery pack and used for measuring the SOC change value of each battery pack and transmitting the SOC change value to the DC/DC control module;
the first voltage acquisition module is connected with the sub-module battery pack and used for acquiring a voltage value of the battery pack and transmitting the voltage value to the DC/DC control module;
the second current detection module is connected with the submodule DC/DC booster circuit inductor L and used for collecting a current value flowing on the inductor L and transmitting the current value to the DC/DC control module;
the DC/DC control module is connected with the first voltage acquisition module, the second current detection module and the delta SOC module and is used for generating a DC/DC booster circuit switch T1Control signal and switch T2Controlling the signal and controlling the signal;
the second voltage detection module is connected with the sub-module capacitor and used for collecting a capacitor voltage value and transmitting the capacitor voltage value to the half-bridge control module;
the first current detection module is connected with the alternating current output side and used for collecting a current value of the alternating current output side and transmitting the current value to the half-bridge control module;
the third voltage acquisition module is connected with the alternating current output side and used for acquiring a voltage value of the alternating current side and transmitting the voltage value to the half-bridge control module;
the half-bridge control module is connected with the second voltage acquisition module, the third voltage acquisition module and the first current acquisition module and used for generating a half-bridge circuit switch T3Control signal and switch T4Control signals and control them.
2. The multilevel energy storage converter based retired battery echelon utilization system of claim 1, wherein: the multilevel energy storage type converter comprises six three-phase groups of bridge arms, each phase of bridge arm consists of an upper group of bridge arms, a lower group of bridge arms and a filter connected with the upper group of bridge arms, each group of bridge arms consists of N sub-modules connected in series, each bridge arm sub-module consists of a battery pack, a capacitor, a DC/DC booster circuit and a half-bridge circuit part which are connected in parallel, and the battery pack comprises a BMS equalizing circuit.
3. The multilevel energy storage converter based retired battery echelon utilization system of claim 1 or 2, wherein: the control method of the DC/DC control module comprises the following steps: obtaining the output power reference P of the ith x-phase sub-module according to the distribution condition of delta SOC in inverse proportionrefxi(ii) a Wherein x is A, B, C, i is 1-2N; using output power reference PrefxiAnd the voltage V of the battery packbatThe inductive current reference i can be obtainedLref(ii) a Comparing inductor current reference iLrefAnd detecting the current iLAnd obtaining a control signal of the DC/DC booster circuit.
4. The multilevel energy storage converter based retired battery echelon utilization system of claim 1 or 2, wherein: the control method of the half-bridge control module comprises the following steps: according to the output power reference PrefAnd an AC output voltage VxTo obtain an AC output current reference iref(ii) a Comparing AC output current reference irefAnd carrying out PI modulation on the detected alternating current output current i to obtain a sub-dieBlock control signal Mxi(ii) a Calculating the average value V of the capacitor voltages of all the sub-modulescrefAnd is in parallel with the actual capacitor voltage VxiComparing to obtain an adjustment control signal Txi(ii) a Superimposing submodule control signals MxiAnd adjusting the control signal TxiAnd obtaining a half-bridge circuit control signal.
5. A method for a multilevel energy storage converter based decommissioned battery echelon utilization system according to any of claims 1 to 4, comprising the steps of:
step 1, setting the same duty ratio for all switches in the multi-level energy storage type converter, and measuring the SOC change value of each battery pack by using a delta SOC module after outputting certain power;
step 2, according to the inverse ratio of delta SOC, the output power is referred to PrefDistributing and determining the output power P of each sub-module battery packrefxi；
Step 3, utilizing the output power P of the sub-module battery packrefxiThe reference current L flowing through the inductor L in the DC/DC booster circuit is obtained through the output of the first voltage detection moduleref；
Step 4, utilizing the reference current L flowing through the inductor LrefAnd the second current detection module outputs the current to the DC/DC control module to obtain a switch T2Duty cycle of, switch T1Duty ratio of (1) and T2Complementary, DC/DC control module switches T through boost circuit1Duty cycle of and switch T2As a control signal to control it;
step 5, utilizing output power reference PrefAnd a third voltage detection module for obtaining an AC output current reference iref；
Step 6, measuring all capacitor voltages by using a second voltage detection module, and solving the average value V of all capacitor voltagescref；
Step 7, averaging all capacitor voltages VcrefA second voltage detection module, an AC output current reference irefThe first current detection module outputs to the half-bridge control module to obtain an outputOff T3Duty cycle of, switch T4Duty ratio of (1) and T3Complementary, half-bridge control module switches T through half-bridge circuit3Duty cycle of and switch T4As a control signal to switch it.
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