CN107645249A - A kind of multi-level converter converting operation control method based on phase-shifting carrier wave modulation - Google Patents
A kind of multi-level converter converting operation control method based on phase-shifting carrier wave modulation Download PDFInfo
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- CN107645249A CN107645249A CN201610579792.1A CN201610579792A CN107645249A CN 107645249 A CN107645249 A CN 107645249A CN 201610579792 A CN201610579792 A CN 201610579792A CN 107645249 A CN107645249 A CN 107645249A
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Abstract
The invention discloses a kind of multi-level converter converting operation control method based on phase-shifting carrier wave modulation, including MMC topologys, shifting modulation technology, submodule capacitor voltage to control three parts.The present invention is directed to MMC low-frequency operation operating modes, by modeling analysis its submodule voltage pulsation it is violent the reason for, and then from the angle for maintaining upper and lower bridge arm power dynamic equilibrium, it is proposed that a kind of low-frequency voltage based on injection high frequency common mode voltage and high frequency circulating currents fluctuates suppressing method, make under MMC frequency conversion operating modes in low-frequency range normal work.Excellent output harmonic wave characteristic can be obtained under low switching frequency, and harmonic performance improves as MMC cascades degree increases while the operation of system normal reliable is ensured.
Description
Art
The present invention relates to a kind of multi-level converter, more particularly to a kind of multi-level converter based on phase-shifting carrier wave modulation
Converting operation control method.
Background technology
In recent years, so that voltage class is high, harmonic characterisitic is good etc., advantage obtains multi-level converter in the high-power field of mesohigh
To extensive use.Wherein, Modular multilevel converter (modular multilevel converter, MMC) is with biography
While multi-level converter advantage of uniting, with the direct cascade structure of its high modularization, can four quadrant running and nothing back-to-back
The features such as needing bulky isolating transformer, obtains the concern of numerous experts and scholars, turns into multi-level converter technical field
Study hotspot.Since MMC topologys in 2001 propose, various countries experts and scholars are for its modeling analysis, modulation strategy, submodule
Substantial amounts of scientific paper has been delivered in capacitor voltage balance control, loop current suppression, fault diagnosis and protection etc..
Up to the present, research related MMC and application have focused largely on HVDC (high-voltage direct
Current, HVDC) the power frequency operation operating mode [12-17] such as transmission of electricity, new-energy grid-connected, reactive-load compensation.If MMC is used as high-power
Alternating current generator drives, and compared to Cascade H bridge type multi-level converter, can not only save a large amount of bulky isolating transformers,
And it is easy to implement system four quadrant running.However, submodule capacitor voltage fluctuates the intrinsic of aggravation when MMC has low-frequency operation
Problem, normal reliable is run during to ensure that it drives as motor, and progress control methods of the MMC under frequency conversion operating mode is urgently complete
It is kind.
MMC output voltage is used as by its submodule (sub-module, SM) capacitance voltage and supported, therefore maintains submodule
Capacitor voltage balance is the precondition for ensureing converter even running.Because MMC submodule electric capacity is to suspend, running
During bridge arm current periodically to capacitor charge and discharge capacitance voltage can be caused to fluctuate.
The content of the invention
In order to overcome the problem in multi-level converter control, the present invention proposes a kind of based on the more electric of phase-shifting carrier wave modulation
Flat converter converting operation control method.
The technical solution adopted for the present invention to solve the technical problems is：
Present invention design is a kind of to suppress low frequency operating mode voltage pulsation by injecting high frequency common mode voltage and high frequency circulating currents
Method, and be based on the method and propose submodule voltage balancing control strategy during MMC converting operations, by electric capacity in motor full speed section
Voltage pulsation is limited in smaller range.
Adjusted based on the multi-level converter converting operation control method of phase-shifting carrier wave modulation, including MMC topologys, phase-shifting carrier wave
Technology processed, submodule capacitor voltage control three parts.
The MMC topologys include the buffer inductance of upper and lower two bridge arms and two suppression circulation, wherein each bridge arm is by N
Individual submodule is directly in series.
The shifting modulation technology gives the implementation for MMC output two kinds of level phase voltages of N+1 and 2N+1 of sening as an envoy to.
The submodule capacitor voltage control includes circulation control and two parts of voltage balancing control.
The beneficial effects of the invention are as follows：The present invention is directed to MMC low-frequency operation operating modes, passes through its submodule voltage of modeling analysis
The reason for violent is fluctuated, and then from the angle for maintaining upper and lower bridge arm power dynamic equilibrium, is proposed a kind of based on injection high frequency
The low-frequency voltage of common-mode voltage and high frequency circulating currents fluctuates suppressing method, makes under MMC frequency conversion operating modes in low-frequency range normal work.Can
While the operation of system normal reliable is ensured, excellent output harmonic wave characteristic, and harmonic performance are obtained under low switching frequency
Improve as MMC cascades degree increases.
Brief description of the drawings
Fig. 1 system main circuits.
Fig. 2 submodular circuits.
Fig. 3 circulation controls.
Fig. 4 voltage balancing controls.
Fig. 5 control structures and its framework.
Specific embodiment
In Fig. 1 and Fig. 2, MMC is per the buffer inductance for mutually including upper and lower two bridge arms and two suppression circulation, wherein each
Bridge arm is directly in series by N number of submodule.Submodule uses half-bridge structure, and its DC voltage passes through submodule electric capacity CSM
Support, port A and port B with main circuit being connected..Pass through the control to upper and lower two switching devices S1, S2 in each submodule
System, can put into or cut off main circuit by submodule electric capacity.When S1 is opened, S2 is turned off, electric capacity input main circuit, submodule work
Make in input state；When S1 shut-offs, S2 are opened, electric capacity is bypassed, and submodule is operated in excision state.Therefore, each bridges of MMC
Arm can be equivalent to independent voltage source, during the group module capacitance balance of voltage, each cross streams side output-voltage levels of converter
It can be fitted by the quantity of the mutually upper and lower bridge arm input submodule.For the MMC of the N number of submodule of each bridge arm, according to modulation plan
It is slightly different, the exportable N+1 of its AC or 2N+1 level phase voltage.
In Fig. 3, Fig. 4, circulation control block diagram, the control causes circulation izjTrace command signalI.e.Pass through
Ratio (proportional, P) adjuster obtains circulation command voltageVoltage balancing control block diagram, wherein, Sign is symbol
Function, to judge upper and lower bridge arm current ipj、injDirection, when the sense of current be timing output+1, when the sense of current is negative
When output -1.The control is according to each submodule capacitor voltage u of upper and lower bridge armcpjN、NcnjNWith its set-pointDifference, with reference to this
Bridge arm current direction, is selected submodule working condition, to control capacitor charge and discharge, to reach balance submodule where submodule
The purpose of block capacitance voltage.It is same to use P adjusters, its output quantity to obtain each submodule electric capacity after being multiplied with sign function output
The balance of voltage instructs ubpjN、ubnjN。
The three-stage control system framework that master controller, pilot controller and submodule block controller of the present invention are combined.1st grade
Master controller uses DSP, to coordinate outside AD sample each bridge arm current, realize control algolithm produce bridge arm voltage modulating wave,
Communicated with pilot controller.2nd grade of pilot controller uses FPGA, to realize the outside AD of modulation strategy, control, failure
Protection, from submodule block controller reading submodule capacitance voltage and fault-signal and it is sent to pwm pulse.3rd level controller
For submodule block controller, control chip uses FPGA, is aided with A/D chip and submodule capacitor voltage is sampled.In addition, submodule
Block controller will be extended to PWM simultaneously and add dead band, be that two switching devices produce trigger pulse.Group module switch
When device or electric capacity break down, submodule block controller sends fault-signal to second level pilot controller, realizes fault diagnosis
And system protection.
Claims (4)
- A kind of 1. multi-level converter converting operation control method based on phase-shifting carrier wave modulation, it is characterised in that：Opened up including MMC Flutter, shifting modulation technology, submodule capacitor voltage control three parts.
- 2. the multi-level converter converting operation control method as claimed in claim 1 based on phase-shifting carrier wave modulation, its feature It is that the MMC topologys include the buffer inductance of upper and lower two bridge arms and two suppression circulation, wherein each bridge arm is by N number of son Module is directly in series.
- 3. the multi-level converter converting operation control method as claimed in claim 1 based on phase-shifting carrier wave modulation, its feature It is implementation of the shifting modulation technology to MMC output two kinds of level phase voltages of N+1 and 2N+1 of sening as an envoy to.
- 4. the multi-level converter converting operation control method as claimed in claim 1 based on phase-shifting carrier wave modulation, its feature It is that the submodule capacitor voltage control includes circulation control and two parts of voltage balancing control.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610579792.1A CN107645249A (en) | 2016-07-21 | 2016-07-21 | A kind of multi-level converter converting operation control method based on phase-shifting carrier wave modulation |
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| CN201610579792.1A CN107645249A (en) | 2016-07-21 | 2016-07-21 | A kind of multi-level converter converting operation control method based on phase-shifting carrier wave modulation |
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| CN107645249A true CN107645249A (en) | 2018-01-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599603A (en) * | 2018-04-10 | 2018-09-28 | 西北工业大学 | A kind of Modular multilevel converter and its capacitance voltage Ripple Suppression method |
| CN108683348A (en) * | 2018-06-19 | 2018-10-19 | 西安交通大学 | C-MMC static state voltage equipoise control methods based on draw-out power supply control |
| CN111371336A (en) * | 2020-04-10 | 2020-07-03 | 东南大学 | Hybrid modular multilevel converter based on energy self-balancing circuit |
| CN112532041A (en) * | 2020-11-18 | 2021-03-19 | 华中科技大学 | Carrier phase-shifting MMC common-mode EMI suppression method based on spatial spread spectrum |
| US20210389376A1 (en) * | 2019-07-23 | 2021-12-16 | Shanghai Jiao Tong University | Testing circuit, system and control method for multiple submodules of cascaded converter |
| CN114499125A (en) * | 2022-04-01 | 2022-05-13 | 珠海澳大科技研究院 | Carrier phase-shifting pulse width modulation method, controller and MMC cascade system |
-
2016
- 2016-07-21 CN CN201610579792.1A patent/CN107645249A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599603A (en) * | 2018-04-10 | 2018-09-28 | 西北工业大学 | A kind of Modular multilevel converter and its capacitance voltage Ripple Suppression method |
| CN108599603B (en) * | 2018-04-10 | 2021-05-07 | 西北工业大学 | Modular multilevel converter and capacitor voltage ripple suppression method thereof |
| CN108683348A (en) * | 2018-06-19 | 2018-10-19 | 西安交通大学 | C-MMC static state voltage equipoise control methods based on draw-out power supply control |
| CN108683348B (en) * | 2018-06-19 | 2019-12-24 | 西安交通大学 | C-MMC static voltage-sharing control method based on energy-taking power control |
| US20210389376A1 (en) * | 2019-07-23 | 2021-12-16 | Shanghai Jiao Tong University | Testing circuit, system and control method for multiple submodules of cascaded converter |
| US11899067B2 (en) * | 2019-07-23 | 2024-02-13 | Shanghai Jiao Tong University | Testing circuit, system and control method for multiple submodules of cascaded converter |
| CN111371336A (en) * | 2020-04-10 | 2020-07-03 | 东南大学 | Hybrid modular multilevel converter based on energy self-balancing circuit |
| CN112532041A (en) * | 2020-11-18 | 2021-03-19 | 华中科技大学 | Carrier phase-shifting MMC common-mode EMI suppression method based on spatial spread spectrum |
| CN114499125A (en) * | 2022-04-01 | 2022-05-13 | 珠海澳大科技研究院 | Carrier phase-shifting pulse width modulation method, controller and MMC cascade system |
| CN114499125B (en) * | 2022-04-01 | 2022-06-21 | 珠海澳大科技研究院 | Carrier phase-shifting pulse width modulation method, controller and MMC cascade system |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180130 |
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| WD01 | Invention patent application deemed withdrawn after publication |