CN112865247A - Balance control algorithm based on bidirectional flyback transformer - Google Patents
Balance control algorithm based on bidirectional flyback transformer Download PDFInfo
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- CN112865247A CN112865247A CN202110169173.6A CN202110169173A CN112865247A CN 112865247 A CN112865247 A CN 112865247A CN 202110169173 A CN202110169173 A CN 202110169173A CN 112865247 A CN112865247 A CN 112865247A
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0018—Circuits for equalisation of charge between batteries using separate charge circuits
Abstract
The invention discloses a balance control algorithm based on a bidirectional flyback transformer, which comprises the following steps: the bidirectional flyback DCDC balancing topology circuit comprises a switch array and a DC/DC converter; the switch array is used for gating the battery cells to be equalized and connecting the battery cells to one end of the DC/DC converter; the equalization control algorithm comprises the following steps: stp1, monitoring the SOC of the battery monomer in real time by adopting a KF observer; stp2, performing balance control on the ternary battery; stp3, balance control is carried out on the lithium iron phosphate battery. The system and the method adopt the KF observer to calculate the SOC of the single battery, so as to realize the real-time monitoring of the SOC of the single battery; the battery monomer to be balanced is gated by adopting the switch gating array, the battery monomer to be balanced is connected to the DCDC converter, and the energy transfer between the battery monomer and the battery module is realized by utilizing the principle of bidirectional DCDC voltage boosting and reducing, so that the effective balance of the battery is realized; the circuit is simple and the control is convenient.
Description
Technical Field
The invention belongs to the technical field, and particularly relates to a balance control algorithm based on a bidirectional flyback transformer.
Background
With the increasing energy crisis and environmental pollution, the rational and effective utilization of energy is becoming a major concern of people. The single batteries are connected in a certain way to meet the actual use requirement, and the problem of inconsistency of the batteries is inevitable. It is known that the efficiency of the battery after the battery is grouped is affected by the short plate effect of the battery. To solve this practical problem, it is often necessary to balance the cells. In order to improve the consistency of the batteries, the invention designs an equalization control algorithm based on a bidirectional flyback transformer.
Disclosure of Invention
The invention aims to provide a balance control algorithm based on a bidirectional flyback transformer, which is characterized in that a KF observer is adopted to calculate the SOC of a single battery, so that the real-time monitoring of the SOC of the single battery is realized; the battery monomer to be balanced is gated by adopting the switch gating array, the battery monomer to be balanced is connected to the DCDC converter, and the energy transfer between the battery monomer and the battery module is realized by utilizing the principle of bidirectional DCDC voltage boosting and reducing, so that the effective balance of the battery is realized; the circuit is simple and the control is convenient.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a balancing control algorithm based on a bidirectional flyback transformer, which comprises a bidirectional flyback DCDC balancing topological circuit, wherein the bidirectional flyback DCDC balancing topological circuit comprises a switch array and a DC/DC converter; the switch array is used for gating the battery cells to be equalized and connecting the battery cells to one end of the DC/DC converter;
the equalization control algorithm operates according to the following steps:
stp1, adopting a KF observer to monitor the SOC of the battery cell in real time, and comprising the following substeps:
stp11, initializing a state, wherein the acquisition state comprises z and U, wherein z represents the SOC of the battery, U represents the voltage drop of the battery on a polarization capacitor, and P represents a variance matrix of the state;
stp12, acquisition State update and variance matrix update, where QkObserving noise for the system;
stp13, computing Kalman gain and status update, where RkRepresents the measurement variance, y represents the observed voltage of the battery;
stp14, variance update Pk；
Stp2, equalization algorithm for a ternary battery, comprising the following sub-steps:
stp21, collecting battery voltage data (Vol) in real time;
stp22, setting a balance threshold bandwidth delta Vol;
stp23, calculating the current average Vol (Vol) of the batteryavg,k+ΔVol)；
Stp24, priority high Vol cells charging battery pack: judging whether the Vol of the single battery in the battery pack is higher than (Vol)avg,k+ delta Vol), if so, connecting the battery monomer with the highest SOC to the battery side of the DC/DC converter through the switch array, connecting the battery module to the other side of the DC/DC converter, starting to charge the battery pack by the high Vol battery monomer, and when all the battery monomers higher than the Vol average value are within the set equalization threshold band, starting to supplement power to the low Vol battery monomer by the battery pack;
stp3 equalization algorithm for lithium iron phosphate batteries, comprising the following substeps:
stp31, collecting battery voltage data (Vol) in real time;
stp32, setting a balance threshold bandwidth delta Vol;
stp33, calculating the current average Vol (Vol) of the batteryavg,k+ΔVol)；
Stp34, priority high Vol cells charging battery pack: judging in the battery packWhether Vol of the single battery is higher than (Vol)avg,k+ delta Vol), if so, connecting the battery monomer with the highest SOC to the battery side of the DC/DC converter through the switch array, connecting the battery module to the other side of the DC/DC converter, starting to charge the battery pack by the high Vol battery monomer, and when all the battery monomers higher than the Vol average value are within the set equalization threshold band, starting to supplement power to the low Vol battery monomer by the battery pack;
stp35, when step Stp34 is completed, calculating the SOC of the battery in real time by using a KF algorithm;
stp36, setting the equalization threshold bandwidth delta SOC;
stp37, calculate the current average SOC of the battery (SOCavg,k)；
stp38, priority high SOC cells charging battery pack: judging whether the SOC of the single body in the battery pack is higher than (SOC)avg,kAnd + delta SOC), if so, connecting the highest SOC battery monomer to the battery side of the DC/DC converter by using the switch array, connecting the other side of the DC/DC converter to the battery module, starting to charge the battery pack by using the high SOC battery monomer, and when all the battery monomers higher than the SOC average value are within a set equalization threshold band, starting to supplement power to the low SOC battery monomer by using the battery pack.
The invention has the following beneficial effects:
the system and the method adopt the KF observer to calculate the SOC of the single battery, so as to realize the real-time monitoring of the SOC of the single battery; the battery monomer to be balanced is gated by adopting the switch gating array, the battery monomer to be balanced is connected to the DCDC converter, and the energy transfer between the battery monomer and the battery module is realized by utilizing the principle of bidirectional DCDC voltage boosting and reducing, so that the effective balance of the battery is realized; the circuit is simple and the control is convenient.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit diagram of a bidirectional flyback DCDC equalization topology circuit;
FIG. 2 is a flow chart of an equalization control algorithm based on a bidirectional flyback transformer;
FIG. 3 is a flow chart of real-time monitoring of the SOC of the battery cell by a KF observer;
FIG. 4 is a flow chart of an equalization algorithm for a ternary battery;
fig. 5 is a flow chart of an equalization algorithm for a lithium iron phosphate battery.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention is an equalization control algorithm based on a bidirectional flyback transformer, including a bidirectional flyback DCDC equalization topology circuit, where the bidirectional flyback DCDC equalization topology circuit includes a switch array and a DC/DC converter; the switch array is used for gating the battery cells to be equalized and connecting the battery cells to one end of the DC/DC converter;
as shown in fig. 2, the present invention is an equalization control algorithm based on a bidirectional flyback transformer, which includes the following steps:
stp1, as shown in FIG. 3, the method for monitoring the SOC of the battery cell in real time by adopting a KF observer comprises the following substeps:
stp11, initializing a state, wherein the acquisition state comprises z and U, wherein z represents the SOC of the battery, U represents the voltage drop of the battery on a polarization capacitor, and P represents a variance matrix of the state;
stp12, acquisition State update and variance matrix update, where QkObserving noise for the system;
stp13, computing Kalman gain and status update, where RkRepresents the measurement variance, y represents the observed voltage of the battery;
stp14, variance update Pk；
Stp2, as shown in FIG. 4, for the implementation of the equalization algorithm for the battery, in order to improve the equalization efficiency, the equalization algorithm for the ternary battery comprises the following sub-steps:
stp21, collecting battery voltage data (Vol) in real time;
stp22, setting a balance threshold bandwidth delta Vol;
stp23, calculating the current average Vol (Vol) of the batteryavg,k+ΔVol)；
Stp24, priority high Vol cells charging battery pack: judging whether the Vol of the single battery in the battery pack is higher than (Vol)avg,k+ delta Vol), if so, connecting the battery monomer with the highest SOC to the battery side of the DC/DC converter through the switch array, connecting the battery module to the other side of the DC/DC converter, starting to charge the battery pack by the high Vol battery monomer, and when all the battery monomers higher than the Vol average value are within the set equalization threshold band, starting to supplement power to the low Vol battery monomer by the battery pack;
stp3, as shown in FIG. 5, the equalization algorithm for battery is implemented, in order to improve the equalization efficiency, the equalization algorithm for lithium iron phosphate battery includes the following sub-steps:
stp31, collecting battery voltage data (Vol) in real time;
stp32, setting a balance threshold bandwidth delta Vol;
stp33, calculating the current average Vol (Vol) of the batteryavg,k+ΔVol)；
Stp34, priority high Vol cells charging battery pack: judging whether the Vol of the single battery in the battery pack is higher than (Vol)avg,k+ delta Vol), if so, connecting the battery monomer with the highest SOC to the battery side of the DC/DC converter through the switch array, connecting the battery module to the other side of the DC/DC converter, starting to charge the battery pack by the high Vol battery monomer, and when all the battery monomers higher than the Vol average value are within the set equalization threshold band, starting to supplement power to the low Vol battery monomer by the battery pack;
stp35, when step Stp34 is completed, calculating the SOC of the battery in real time by using a KF algorithm;
stp36, setting a balance threshold bandwidth delta SOC;
stp37, calculate the current average SOC of the battery (SOCavg,k)；
stp38, priority high SOC cells charging battery pack: judging whether the SOC of the single body in the battery pack is higher than (SOC)avg,kAnd + delta SOC), if so, connecting the highest SOC battery monomer to the battery side of the DC/DC converter by using the switch array, connecting the other side of the DC/DC converter to the battery module, starting to charge the battery pack by using the high SOC battery monomer, and when all the battery monomers higher than the SOC average value are within a set equalization threshold band, starting to supplement power to the low SOC battery monomer by using the battery pack.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (1)
1. A balance control algorithm based on a bidirectional flyback transformer is characterized in that: the bidirectional flyback DC-DC balancing topology circuit comprises a switch array and a DC/DC converter; the switch array is used for gating the battery cells to be equalized and connecting the battery cells to one end of the DC/DC converter;
the equalization control algorithm operates according to the following steps:
stp1, adopting a KF observer to monitor the SOC of the battery cell in real time, and comprising the following substeps:
stp11, initializing a state, wherein the acquisition state comprises z and U, wherein z represents the SOC of the battery, U represents the voltage drop of the battery on a polarization capacitor, and P represents a variance matrix of the state;
stp12, acquisition State update and variance matrix update, where QkObserving noise for the system;
stp13, computing Kalman gain and status update, where RkRepresents the measurement variance, y represents the observed voltage of the battery;
stp14, variance update Pk；
Stp2, equalization algorithm for a ternary battery, comprising the following sub-steps:
stp21, collecting battery voltage data (Vol) in real time;
stp22, setting a balance threshold bandwidth delta Vol;
stp23, calculating the current average Vol (Vol) of the batteryavg,k+ΔVol)；
Stp24, priority high Vol cells charging battery pack: judging whether the Vol of the single battery in the battery pack is higher than (Vol)avg,k+ delta Vol), if so, connecting the battery monomer with the highest SOC to the battery side of the DC/DC converter through the switch array, connecting the battery module to the other side of the DC/DC converter, starting to charge the battery pack by the high Vol battery monomer, and when all the battery monomers higher than the Vol average value are within the set equalization threshold band, starting to supplement power to the low Vol battery monomer by the battery pack;
stp3 equalization algorithm for lithium iron phosphate batteries, comprising the following substeps:
stp31, collecting battery voltage data (Vol) in real time;
stp32, setting a balance threshold bandwidth delta Vol;
stp33, calculating the current average Vol (Vol) of the batteryavg,k+ΔVol)；
Stp34, priority high Vol cells charging battery pack: judging whether the Vol of the single battery in the battery pack is higher than (Vol)avg,k+ delta Vol), if yes, the battery monomer with the highest SOC is connected to the battery side of the DC/DC converter through the switch array, the other side of the DC/DC converter is connected with the battery module, the battery monomer with high Vol is started to charge the battery pack, and when all the battery monomers higher than the Vol average value are within the set equalization threshold band, the battery is startedThe group is charged to the low Vol battery monomer;
stp35, when step Stp34 is completed, calculating the SOC of the battery in real time by using a KF algorithm;
stp36, setting the equalization threshold bandwidth delta SOC;
stp37, calculate the current average SOC of the battery (SOCavg,k)；
stp38, priority high SOC cells charging battery pack: judging whether the SOC of the single body in the battery pack is higher than (SOC)avg,kAnd + delta SOC), if so, connecting the highest SOC battery monomer to the battery side of the DC/DC converter by using the switch array, connecting the other side of the DC/DC converter to the battery module, starting to charge the battery pack by using the high SOC battery monomer, and when all the battery monomers higher than the SOC average value are within a set equalization threshold band, starting to supplement power to the low SOC battery monomer by using the battery pack.
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Citations (3)
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| CN102981125A (en) * | 2012-11-30 | 2013-03-20 | 山东省科学院自动化研究所 | SOC (Stress Optical Coefficient) estimation method for power batteries based on RC (Remote Control) equivalent model |
| CN104617623A (en) * | 2015-01-30 | 2015-05-13 | 武汉理工大学 | Balance control method for power battery pack of electric vehicle |
| CN111976538A (en) * | 2019-12-27 | 2020-11-24 | 中北大学 | Equalizing structure and equalizing method of vehicle-mounted composite power supply system |
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- 2021-02-07 CN CN202110169173.6A patent/CN112865247A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981125A (en) * | 2012-11-30 | 2013-03-20 | 山东省科学院自动化研究所 | SOC (Stress Optical Coefficient) estimation method for power batteries based on RC (Remote Control) equivalent model |
| CN104617623A (en) * | 2015-01-30 | 2015-05-13 | 武汉理工大学 | Balance control method for power battery pack of electric vehicle |
| CN111976538A (en) * | 2019-12-27 | 2020-11-24 | 中北大学 | Equalizing structure and equalizing method of vehicle-mounted composite power supply system |
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| 蒋旭吟 等: "基于电池组模型的EKF-UKF 电池参数和在线估计", 电源技术, vol. 44, no. 2, pages 264 - 272 * |
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