CN105471239A - Method for eliminating ripple waves in bus capacitor of dual motor-inverter system - Google Patents
Method for eliminating ripple waves in bus capacitor of dual motor-inverter system Download PDFInfo
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- CN105471239A CN105471239A CN201511013236.XA CN201511013236A CN105471239A CN 105471239 A CN105471239 A CN 105471239A CN 201511013236 A CN201511013236 A CN 201511013236A CN 105471239 A CN105471239 A CN 105471239A
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- Prior art keywords
- inverter
- digital core
- bus capacitor
- motor
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a method for eliminating ripple waves in a bus capacitor of a dual motor-inverter system. According to the dual motor-inverter system, two groups of inverters are powered by a group of direct current power sources respectively; the two groups of inverters are connected with two groups of motors respectively; the direct current power sources are also connected with the bus capacitor in parallel; the two groups of inverters are controlled by two groups of pulse width modulation waves output by digital cores; synchronous control is carried out between the first digital core and the second digital core through a clock signal; and the pulse width modulation waves output by the first digital core and the second digital core are the same in frequency and the phase difference is 180 degrees. The ripple waves of the first inverter and the second inverter are superposed at two ends of the bus capacitor; and the phase difference is 180 degrees, so that the current amplitude of the superposed high-frequency ripple waves is smaller than the original current amplitude or even offset with the original current amplitude; high-frequency ripple wave current caused by high-frequency ripple wave superposition in the two inverters in the dual motor system is effectively reduced; and high-frequency ripple waves supported in the bus capacitor can be effectively reduced.
Description
Technical field
The present invention relates to Electric Machine Control, particularly a kind of bi-motor-inverter system bus capacitor ripple removing method.
Background technology
In bi-motor-inverter system, adopt one group of DC power supply to power to two groups of inverters, drag two machine operation respectively, its structure as shown in Figure 1, includes DC power supply DC, bus capacitor C, first inverter, the first motor M 1, second inverter and the second motor M 2.The scheme of existing scheme is the electronic power switch that employing digital core controls in two groups of inverters simultaneously, and as shown in Figure 2, digital core exports 2 group of 6 road pulse-width modulation waveform simultaneously and controls two groups of inverters.When carrying out pulse-width modulation, what adopt is the high frequency carrier of same frequency, be generally 1kHz ~ 20kHz, both carrier phases are identical, so when the first inverter and the second inverter work simultaneously, except the superposition of both first-harmonics, both carrier waves also can superpose, and identical ripple can superpose, and makes the ripple amplitude of bus capacitor be the twice of single inverter, need the ripple current ability to bear of passive increase capacitor, add cost and electric capacity volume is increased.
Summary of the invention
The object of the invention is to provide a kind of bi-motor-inverter system bus capacitor ripple removing method.
Technical scheme of the present invention is:
A kind of bi-motor-inverter system bus capacitor ripple removing method, described bi-motor-inverter system adopts one group of DC power supply respectively to the first inverter and the second inverter power supply, first inverter and the second inverter are connected the first motor and the second motor respectively, described DC power supply is a bus capacitor in parallel also, the pulse width modulated wave that described first inverter and the second inverter are exported by the first digital core and the second digital core respectively controls, Synchronization Control is carried out by clock signal between described first digital core and the second digital core, the pulse-width modulation wave frequency making both export is identical, phase 180 °.
Described first digital core exports 6 road pulse width modulated waves and controls the first inverter, and the second digital core exports 6 road pulse width modulated waves and controls the second inverter, and two groups of pulse-width modulation wave frequencies are identical, phase 180 °.
Described first digital core and the second digital core adopt counter to compare to produce pulse-width modulation waveform respectively, and the count cycle of counter is corresponding with the frequency of pulse-width modulation waveform.
Advantage of the present invention is:
Bi-motor provided by the present invention-inverter system bus capacitor ripple removing method, adopt two groups of digital cores to export two groups of pulse width modulated waves and control two inverters respectively, first inverter can superpose at bus capacitor two ends with the ripple of the second inverter, but because phase 180 degree, result is that the high frequency ripple current amplitude of superposition can be less than original, and even both offset.The present invention effectively reduces both inverter medium-high frequency ripples in dual motors system and superposes the high frequency ripple current brought, and can effectively reduce the high frequency ripple of bearing in bus capacitor.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is the schematic diagram of existing bi-motor-inverter system;
Fig. 2 is the schematic diagram that existing individual digit core controls two groups of inverters simultaneously;
Fig. 3 is the schematic diagram of bi-motor of the present invention-inverter system bus capacitor ripple removing method.
Embodiment
As shown in Figure 3, for the schematic diagram of disclosed bi-motor-inverter system bus capacitor ripple removing method, described bi-motor-inverter system adopts one group of DC power supply 1 to power to the first inverter 3 and the second inverter 4 respectively, first inverter 3 and the second inverter 4 are connected the first motor 5 and the second motor 6 respectively, described DC power supply 1 is a bus capacitor 2 in parallel also, and the pulse width modulated wave that described first inverter 3 and the second inverter 4 are exported by the first digital core 7 and the second digital core 8 respectively controls.
Described first digital core 7 exports six road pulse width modulated waves and controls the first inverter 3, second digital core 8 and export six road pulse width modulated waves to control the second inverter 4, two groups of pulse-width modulation wave frequencies identical, but phase 180 °.Synchronization Control is carried out by clock signal between described first digital core 7 and the second digital core 8, the output pulse width modulating wave of the second digital core 8 is made to postpone half period relative to the output pulse width modulating wave of the first digital core 7, i.e. phase 180 °, but both frequencies are identical.
In the specific implementation, the first digital core 7 and the second digital core 8 adopt special counter to compare to produce pulse-width modulation waveform, and the count cycle of counter is corresponding with the frequency of pulse-width modulation waveform.What generally adopt in Electric Machine Control is Centered pulse-width modulation waveform, so its counter carries out counting from the rising of 0-Max and counting from the decline of Max-0 within a count cycle.When implementing, need the counter clock of the first digital core synchronous with the count frequency of the counter clock of the second digital core, secondly, first start the counter of the first digital core, when its counter register is Max, the counter of synchronous averaging second digital core, both counters are made to differ the phase place of half period all the time, so can realize the carrier phase difference 180 ° of phase places of the pulse-width modulation waveform that the first digital core and the second digital core export, thus reduce the high frequency ripple of DC bus.
The above embodiment of the present invention is intended to the ripple eliminating bi-motor-inverter system bus capacitor, reduce the requirement of bi-motor-inverter system for bus capacitor ripple current ability to bear, this technical scheme is also applicable to the dual frequency converter of all employing pulse modulation technologies, dual H-bridge circuit.
Claims (3)
1. bi-motor-inverter system bus capacitor ripple removing method, described bi-motor-inverter system adopts one group of DC power supply respectively to the first inverter and the second inverter power supply, first inverter and the second inverter are connected the first motor and the second motor respectively, described DC power supply is a bus capacitor in parallel also, it is characterized in that: the pulse width modulated wave that described first inverter and the second inverter are exported by the first digital core and the second digital core respectively controls, Synchronization Control is carried out by clock signal between described first digital core and the second digital core, the pulse-width modulation wave frequency making both export is identical, phase 180 °.
2. bi-motor according to claim 1-inverter system bus capacitor ripple removing method, it is characterized in that: described first digital core exports 6 road pulse width modulated waves and controls the first inverter, second digital core exports 6 road pulse width modulated waves and controls the second inverter, two groups of pulse-width modulation wave frequencies are identical, phase 180 °.
3. bi-motor according to claim 1-inverter system bus capacitor ripple removing method, it is characterized in that: described first digital core and the second digital core adopt counter to compare to produce pulse-width modulation waveform respectively, and the count cycle of counter is corresponding with the frequency of pulse-width modulation waveform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511013236.XA CN105471239A (en) | 2015-12-31 | 2015-12-31 | Method for eliminating ripple waves in bus capacitor of dual motor-inverter system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511013236.XA CN105471239A (en) | 2015-12-31 | 2015-12-31 | Method for eliminating ripple waves in bus capacitor of dual motor-inverter system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105471239A true CN105471239A (en) | 2016-04-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511013236.XA Pending CN105471239A (en) | 2015-12-31 | 2015-12-31 | Method for eliminating ripple waves in bus capacitor of dual motor-inverter system |
Country Status (1)
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| CN (1) | CN105471239A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108336943A (en) * | 2017-01-17 | 2018-07-27 | 福特全球技术公司 | Multiple inverter system for motor |
| CN112003502A (en) * | 2020-09-14 | 2020-11-27 | 苏州汇川技术有限公司 | Carrier phase-shifting control method and system and automobile motor controller |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002300800A (en) * | 2001-03-30 | 2002-10-11 | Nissan Motor Co Ltd | Power converter |
| CN101678778A (en) * | 2007-05-03 | 2010-03-24 | 雷诺股份公司 | Device and method for controlling a power shunt circuit, hybrid vehicle having same |
-
2015
- 2015-12-31 CN CN201511013236.XA patent/CN105471239A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002300800A (en) * | 2001-03-30 | 2002-10-11 | Nissan Motor Co Ltd | Power converter |
| CN101678778A (en) * | 2007-05-03 | 2010-03-24 | 雷诺股份公司 | Device and method for controlling a power shunt circuit, hybrid vehicle having same |
Non-Patent Citations (1)
| Title |
|---|
| 张长勇: "单元级联高压变频器的数字化实现与可靠性研究", 《中国优秀博士学位论文全文数据库工程科技II辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108336943A (en) * | 2017-01-17 | 2018-07-27 | 福特全球技术公司 | Multiple inverter system for motor |
| CN108336943B (en) * | 2017-01-17 | 2023-06-30 | 福特全球技术公司 | Electric drive system and vehicle |
| CN112003502A (en) * | 2020-09-14 | 2020-11-27 | 苏州汇川技术有限公司 | Carrier phase-shifting control method and system and automobile motor controller |
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Application publication date: 20160406 |
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| RJ01 | Rejection of invention patent application after publication |