CN109774538A - The hybrid modulation battery equalization system and method for modular cart battery system - Google Patents
The hybrid modulation battery equalization system and method for modular cart battery system Download PDFInfo
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- CN109774538A CN109774538A CN201811637794.7A CN201811637794A CN109774538A CN 109774538 A CN109774538 A CN 109774538A CN 201811637794 A CN201811637794 A CN 201811637794A CN 109774538 A CN109774538 A CN 109774538A
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Abstract
Proposed by the present invention is the hybrid modulation battery equalization system and method for modular cart battery system, its structure includes electric vehicle three-phase drive motor and coupled n grade three-phase inverter system, it wherein include 3 identical H-bridge units in every level-one three-phase inverter system, H-bridge unit is made of 4 power tubes with the interconnection of " H " shape route, and both ends are connected with 1 battery unit.Advantages of the present invention: (1) can carry out the independent control of voltage output to the battery inverter module in cascade inverter, control in cascade using in the case where different battery modules, control the electric quantity balancing of battery module；(2) it on the basis of not influencing load running, while can control a part of battery module to load output power, can also charge to a part of battery module in system, the flexibility that battery module uses in increase system.
Description
Technical field
The present invention relates to a kind of hybrid modulation battery equalization system of modular cart battery system and methods, belong to
Electric car charge control technical field.
Background technique
Currently, traditional electric car uses a high-tension battery packet (300 or more) and a 6 pipe full-bridge inverting of tradition
Device, this inverter are manufactured using the IGBT power tube of high-voltage great-current, and are come using sine-triangular wave pwm modulation control
Sine wave required for output driving motor.Due to current single battery unit voltage can't independent drive electric vehicle, electricity
The high-tension battery packet of motor-car must be by multiple battery units by constituting in parallel and serial.During driving, high-tension battery
Each battery unit contributes identical power and energy in packet.This requires constitute the battery list of electric vehicle high-tension battery packet
First necessary characteristic is consistent, different brands, different voltages characteristic, different capabilities, and different types of battery cannot be used with.
Summary of the invention
The purpose of the invention is to reduce the production and application cost of battery on electric vehicle, in different brands, different electricity
Characteristic, different capabilities are pressed, different types of battery is used in situation, each battery module of independent control, and recombinant is all
Battery module output, reaches two control purposes: (1) meeting power and energy requirement required for electric vehicle is run；(2) simultaneously
Overall electric discharge is done to all battery modules while controlling electric vehicle operation according to the power and energy situation of battery module
With the Balance route of charging.
Technical solution of the invention: the hybrid modulation battery equalization system of modular cart battery system, structure
For three contrary of n grade being connected respectively with the A phase input terminal, B phase input terminal, C phase input terminal of electric vehicle three-phase drive motor
Become device system, wherein n grades of three-phase inverter systems include the concatenated n identical H-bridge unit of 3 column, electric vehicle three-phase drive electricity
Each phase input terminal of machine is connect with 1 concatenated H-bridge unit, and the H-bridge unit of three-phase series is connected to 1 electrical middle electricity N；Often
It include 3 identical H-bridge units in level-one three-phase inverter system, each H-bridge unit is by 4 power tubes with " H " shape route phase
Connect composition, and both ends are connected with 1 battery unit, and 3 battery units in every level-one three-phase inverter system use
Same battery, specification, output voltage, capacity characteristic are consistent, and the battery list between three-phase inverter system at different levels
First characteristic can be inconsistent.
The equalization methods of the hybrid modulation battery equalization system of modular cart battery system, include the following steps:
The DC-AC of H bridge is modulated with both of which, unipolar mode and bipolar mode；Each H bridge under unipolar mode can
With output+DC, 0 with three kinds of voltages of-DC, and the output to unipolarity modulation control, fundametal compoment can indicate are as follows:
Each H bridge under bipolar mode can only export+DC and the various voltages of-DC two, the output to bipolar modulation control,
Fundametal compoment can indicate are as follows:
Under both the above modulating mode, angle, θ 1 is switched, θ 2, θ 3 can pass through sine wave-triangle wave device, sine wave-
Sawtooth wave comparator or model calculating method generate；Index of modulation k is defined, modulation expression formula is simplified are as follows:
AC compounent and the index of modulation, the cell voltage for modulating output are directly proportional；
The exchange of the hybrid modulation battery equalization system of modular cart battery system can indicate are as follows:
Can be seen that the output of modular battery tandem inverter from above-mentioned alternating voltage output expression formula is multiple standalone modules
Combination output superposition, since battery inverter module is concatenated, so at runtime, all battery inverter modules
Electric current is the same；Therefore, the gross output of the hybrid modulation battery equalization system of modular cart battery system are as follows:
As long as the index of modulation k of each H bridge in independent control cascade structure, so that it may the output work of the independent control module
Rate.
Advantages of the present invention:
(1) present invention can carry out the independent control of voltage output to the battery inverter module in cascade inverter, from
And to the power output independent control of each battery module of modular battery inverter, it controls in cascade using difference
In the case where battery module, the electric quantity balancing of battery module is controlled；
(2) present invention is not influencing to bear on the basis of carrying out standalone module power output to modularization cascade inverter
It, can also be to one in system while can control a part of battery module to load output power on the basis of carrying row
Part of battery module charges, the flexibility that battery module uses in increase system.
Detailed description of the invention
Attached drawing 1 is the structural schematic diagram of the hybrid modulation battery equalization system of modular cart battery system.
Attached drawing 2 is unipolarity modulation output waveform schematic diagram.
Attached drawing 3 is bipolar modulation output waveform schematic diagram.
Attached drawing 4 is the level Four output waveform figure that embodiment 1 is distributed according to power and energy proportion.
Attached drawing 5 is the cascade overall output voltage waveform diagram of 1 level Four of embodiment.
Attached drawing 6 is that the overall output waveform of embodiment 1 passes through the waveform diagram after a R-C filter.
Attached drawing 7 is the level Four output waveform figure that embodiment 2 is distributed according to power and energy proportion.
Attached drawing 8 is the cascade overall output voltage waveform diagram of 2 level Four of embodiment.
Attached drawing 9 is that the overall output waveform of embodiment 2 passes through the waveform diagram after a R-C filter.
Specific embodiment
Under normal conditions, single level system can not meet power requirement, multiple single level systems can be cascaded up, to load
Export high-power, power demand of the cascade series depending on application.As shown in Figure 1, the combination of modular cart battery system
Battery equalization system is modulated, structure is the A phase input terminal, B phase input terminal, C phase input terminal with electric vehicle three-phase drive motor
The n grade three-phase inverter system being connected respectively, wherein n grades of three-phase inverter systems include the concatenated n identical H of 3 column
Each phase input terminal of bridge unit, electric vehicle three-phase drive motor is connect with 1 concatenated H-bridge unit, the H bridge list of three-phase series
Member is connected to 1 electrical middle electricity N；In every level-one three-phase inverter system include 3 identical H-bridge units, each H-bridge unit by
4 power tubes are formed with the interconnection of " H " shape route, and both ends are connected with 1 battery unit, every level-one three-phase inverter system
3 battery units in system use same battery, and specification, output voltage, capacity characteristic are consistent, and three contrary at different levels
The battery unit characteristic become between device system can be inconsistent.
In every level-one three-phase system, the three-phase voltage A, B and C of output are by cell voltage VDCA, VDCB, VDCCLimitation,
In the present invention, in order to keep the balance in three phase controls, it is desirable that VDCA=VDCB=VDCC。
The DC-AC of H bridge is modulated with both of which, unipolar mode and bipolar mode.Each under unipolar mode
H bridge can export+DC, and 0 and three kinds of voltages of-DC, see Fig. 2.
Output to unipolarity modulation control, fundametal compoment can indicate are as follows:
Each H bridge under bipolar mode can only export+DC and the various voltages of-DC two, see Fig. 3.
Output to bipolar modulation control, fundametal compoment can indicate are as follows:
Under both the above modulating mode, angle, θ 1 is switched, θ 2, θ 3 can be generated by any algorithm, such as sine wave-triangle
Wave comparator, sine wave-sawtooth wave comparator or model calculating method.From the above expression formula it can also be seen that control switch angle
Spend θ 1, θ 2, θ 3, so that it may control the output AC component of H bridge.Here define index of modulation k, simplifies modulation expression formula are as follows:
The AC compounent and the index of modulation of output are namely modulated, cell voltage is directly proportional.
In the situation shown in figure 1, the exchange output of whole system can indicate are as follows:
It is exported from above-mentioned alternating voltage
Expression formula can be seen that modular battery tandem inverter output be multiple standalone modules combination output superposition.Due to
Battery inverter module is concatenated, therefore at runtime, and all battery inverter module electric currents are the same.Therefore, exist
In structure shown in Fig. 3, the gross output of system:
As long as the index of modulation k of each H bridge in independent control cascade structure, so that it may the output work of the independent control module
Rate.
It should be strongly noted that all modules are all defeated outward when all module output is all in phase
Positive out shows as battery to load discharge, this when, coefficient was all positive in the voltage and power expression of output
Number.If the output of a part of module and another part module output phase on the contrary, if in real system, a part of battery to
It when load discharge, also charges simultaneously to another part battery, the power of charging is also determined by the index of modulation.Such case
Under, the index of modulation being electrically charged is exactly negative in expression formula, shows that battery is charging when system operation.
Embodiment 1
It is used in 4 grades of cascade structures in electric vehicle, if 4 grades of cell voltages are respectively V1=52V, V2=50V, V3=48V, V4=
46V, the driving energy to load that 4 grades of batteries are capable of providing account for the E of system gross energy respectively1=40%, E2=30%, E3=20%,
E4=10%.In order to keep the balance of battery, a kind of control strategy can allow 4 grades of cell outputs 40% respectively, and 30%, 20%,
10%。
Thus need to control index of modulation satisfaction:
If the driving voltage of load is Vtotal,
Simultaneous two above equation, available 4 grades of control coefrficient are as follows:
Fig. 4 be one output be 120V voltage effective value when, 4 grades of batteries every level-one under above-mentioned power and energy distribution condition
Simulation waveform is battery 52V, the index of modulation 0.4 respectively from top to bottom；Battery 50V, the index of modulation 0.3；Battery 48V, modulation system
Number 0.2；Battery 46V, the simulation waveform of every level-one of the index of modulation 0.1.Fig. 5 is the cascade overall output waveform of level Four.Fig. 6 is
Overall output waveform passes through the waveform diagram after a R-C filter.
Embodiment 2
It is used in 4 grades of cascade structures in electric vehicle, if 4 grades of cell voltages are respectively V1=52V, V2=46V, V3=45V, V4=
38V, the driving energy to load that 4 grades of batteries are capable of providing account for the E of system gross energy respectively1=60%, E2=20%, E3=20%,
E4=0%.In order to guarantee the balance of the operation and the energy content of battery of system between different battery units, need control strategy 1,2
The distribution output power 60% between 3 grades of batteries, 20%, 20%, and at runtime using 10% output power to the 4th grade of battery
Charging.
Thus need to control index of modulation satisfaction:
Simultaneous two above equation, available 4 grades of control coefrficient are as follows:
In order to allow the 4th grade of battery to charge in the process of running, need to control the 4th grade of battery inversion output phase and other 3 grades
Battery is opposite.
4 grades of batteries of a simulation waveform that Fig. 7 is an output when being 80V voltage effective value are in above-mentioned power and energy point
The simulation waveform of every level-one in the case of matching is battery 52V, the index of modulation 0.6 respectively from top to bottom；Battery 46V, the index of modulation
0.2；Battery 45V, the index of modulation 0.2；Battery 38V, the simulation waveform for every level-one that the index of modulation 0.1 charges.Fig. 8 is level Four grade
The overall output waveform of connection.Fig. 9 is that overall output waveform passes through the waveform diagram after a R-C filter.
Each embodiment described above is only the present invention preferably several specific embodiments, but protection scope of the present invention is simultaneously
Not limited to this, anyone skilled in the art is in the technical scope disclosed by the present invention, according to the present invention
Technical solution and its inventive concept are subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (2)
1. the hybrid modulation battery equalization system of modular cart battery system, it is characterized in that its structure is to drive with electric vehicle three-phase
The n grade three-phase inverter system that A phase input terminal, B phase input terminal, the C phase input terminal of dynamic motor are connected respectively, wherein n grades
Three-phase inverter system includes the concatenated n identical H-bridge unit of 3 column, each phase input terminal of electric vehicle three-phase drive motor
It is connect with 1 concatenated H-bridge unit, the H-bridge unit of three-phase series is connected to 1 electrical middle electricity N；Every level-one three-phase inverter system
It include 3 identical H-bridge units in system, each H-bridge unit is made of 4 power tubes with the interconnection of " H " shape route, both ends
Be connected with 1 battery unit, 3 battery units in every level-one three-phase inverter system use same battery, specification,
Output voltage, capacity characteristic are consistent.
2. the equalization methods of the hybrid modulation battery equalization system of modular cart battery system, include the following steps:
The DC-AC of H bridge is modulated with both of which, unipolar mode and bipolar mode；Each H bridge under unipolar mode can
With output+DC, 0 with three kinds of voltages of-DC, and the output to unipolarity modulation control, fundametal compoment can indicate are as follows:
Each H bridge under bipolar mode can only export+DC and the various voltages of-DC two, the output to bipolar modulation control,
Fundametal compoment can indicate are as follows:
Under both the above modulating mode, angle, θ 1 is switched, θ 2, θ 3 can pass through sine wave-triangle wave device, sine wave-
Sawtooth wave comparator or model calculating method generate；Index of modulation k is defined, modulation expression formula is simplified are as follows:
AC compounent and the index of modulation, the cell voltage for modulating output are directly proportional；
The exchange of the hybrid modulation battery equalization system of modular cart battery system can indicate are as follows:
Can be seen that the output of modular battery tandem inverter from above-mentioned alternating voltage output expression formula is multiple standalone modules
Combination output superposition, since battery inverter module is concatenated, so at runtime, all battery inverter modules
Electric current is the same；Therefore, the gross output of the hybrid modulation battery equalization system of modular cart battery system are as follows:
The index of modulation k of each H bridge in independent control cascade structure, so that it may the output power of the independent control module.
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| CN103324864A (en) * | 2013-07-15 | 2013-09-25 | 中国矿业大学(北京) | Method for solving specific harmonic cancellation pulse width modulation inverter switching angle |
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| CN105140978A (en) * | 2014-05-29 | 2015-12-09 | 丰郅(上海)新能源科技有限公司 | Flexible cell management system |
| CN105471312A (en) * | 2015-12-22 | 2016-04-06 | 合肥工业大学 | Three-phase cascade H bridge photovoltaic grid-connected inverter interphase power balance control method |
| CN107910903A (en) * | 2017-09-06 | 2018-04-13 | 中南大学 | The distributing method for controlling power balance of series inverter under a kind of grid-connect mode |
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2018
- 2018-12-29 CN CN201811637794.7A patent/CN109774538A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957196A (en) * | 2012-10-24 | 2013-03-06 | 南京博时上辉电子科技有限公司 | Inverter and charger integrated modularization H-bridge cascade stage UPS (uninterrupted power supply) single/three-phase system |
| CN103324864A (en) * | 2013-07-15 | 2013-09-25 | 中国矿业大学(北京) | Method for solving specific harmonic cancellation pulse width modulation inverter switching angle |
| CN105140978A (en) * | 2014-05-29 | 2015-12-09 | 丰郅(上海)新能源科技有限公司 | Flexible cell management system |
| CN104901381A (en) * | 2015-06-16 | 2015-09-09 | 北京亿利智慧能源科技有限公司 | Equalizing current control method for H-bridge cascaded energy-storing system |
| CN105471312A (en) * | 2015-12-22 | 2016-04-06 | 合肥工业大学 | Three-phase cascade H bridge photovoltaic grid-connected inverter interphase power balance control method |
| CN107910903A (en) * | 2017-09-06 | 2018-04-13 | 中南大学 | The distributing method for controlling power balance of series inverter under a kind of grid-connect mode |
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