CN107612300A - A kind of high-voltage cascade type variable-frequency power sources module failure control method - Google Patents
A kind of high-voltage cascade type variable-frequency power sources module failure control method Download PDFInfo
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- CN107612300A CN107612300A CN201710794967.5A CN201710794967A CN107612300A CN 107612300 A CN107612300 A CN 107612300A CN 201710794967 A CN201710794967 A CN 201710794967A CN 107612300 A CN107612300 A CN 107612300A
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Abstract
The invention discloses a kind of high-voltage cascade type variable-frequency power sources module failure control method, it is divided into master controller and each module bottom controller including high-voltage cascade type variable-frequency power sources module control system, when there is module failure in high-voltage cascade type variable-frequency power sources module, bottom controller controls malfunctioning module auto by pass, out of service；Master controller keeps sample-synchronous cycle T s constant, and faulting instruction and malfunctioning module number are issued into each bottom controller；After each bottom controller receives fault message, carrier cycle is readjusted；Non-faulting module is numbered master controller；Master controller is numbered according to new module, according to sample-synchronous frequency, is issued SPWM dutycycles to modules, is realized that each module exports the phase shifting control of SPWM waveforms.Present invention, avoiding the high frequency distortion of cascade unit output SPWM waveforms, reduces cascade unit output high-frequency harmonic, improves distribution network electric energy quality.
Description
Technical field
The present invention relates to power electronics diagnostic techniques field, more particularly to a kind of high-voltage cascade type converter plant Fault Control
Method.
Background technology
In Practical Project, when high-voltage cascade type variable-frequency power sources emerged in operation module failure, it should in time by failure mould
Block bypasses, and to ensure the normal operation of non-faulting module, strengthens the security reliability of high-voltage cascade variable-frequency power sources module, at present,
Cascade converter mainly uses phase-shifted SPWM switch modulation strategy, by the way that each module SPWM output voltages is mutually folded
Add, to eliminate high-voltage cascade variable-frequency power sources module output high-frequency harmonic, existing high-voltage cascade type variable-frequency power sources module failure solves
Scheme is, after malfunctioning module is bypassed, keeps high-voltage cascade type variable-frequency power sources entirety control strategy constant,
So existing subject matter is, due to the missing of malfunctioning module SPWM output voltages, to cause high-voltage cascade variable-frequency power sources
The increase of the high-frequency harmonic of module entirety SPWM output voltages, cause high-frequency harmonic to flow into power network, influence distribution network electric energy quality.
The present invention in view of the above-mentioned problems, be adjusted to the modulation strategy of high-voltage cascade variable-frequency power sources module after failure, gram
High-voltage cascade variable-frequency power sources module output voltage high frequency distortion problem caused by clothes are lacked due to malfunctioning module, optimize high-voltage cascade
Variable-frequency power sources module modulation strategy, reduce high-voltage cascade variable-frequency power sources module output high-frequency harmonic.
The content of the invention
For deficiency of the prior art, the purpose of the present invention is to reduce high-voltage cascade variable-frequency power sources module output harmonic high frequency
Ripple, solves the problems, such as high-voltage cascade variable-frequency power sources module output voltage high frequency distortion caused by the existing missing due to malfunctioning module.
The object of the present invention is achieved like this：A kind of high-voltage cascade type variable-frequency power sources module failure control method, cascade
Type variable-frequency power sources total number of modules is N, it is allowed to which malfunctioning module number is M, sampling period Ts, the Sine Wave Pulse Width Modulation of each module
SPWM carrier cycles are Tc, and high-voltage cascade type variable-frequency power sources module control system is divided into master controller and each module bottom control
Device, when module failure occurs in high-voltage cascade type variable-frequency power sources module, control strategy is as follows：
Step 1：Bottom controller controls malfunctioning module auto by pass, out of service；
Step 2：Master controller failure judgement module position, and malfunctioning module quantity is counted, it is set as P；
Step 3：Master controller keeps sample-synchronous cycle T s constant, meanwhile, faulting instruction and malfunctioning module number P are issued to
Each bottom controller；
Step 4：After each bottom controller receives fault message, carrier cycle Tc is readjusted；
Step 5：Non-faulting module is numbered master controller, number consecutively module 1, module 2 ..., module N-P；
Step 6：Master controller is numbered according to new module, according to sample-synchronous frequency f=1/Ts, issues SPWM dutycycles successively
To modules, realize that each module exports the phase shifting control of SPWM waveforms.
Compared with prior art, the beneficial effects of the present invention are：By the optimization to phase-shifted SPWM control strategy,
After malfunctioning module is out of service, the continuity of the SPWM waveforms generation of each non-faulting module is still able to ensure that, so as to keep away
The high frequency distortion of high-voltage cascade variable-frequency power sources module output SPWM waveforms is exempted from, it is high to reduce the output of high-voltage cascade variable-frequency power sources module
Frequency harmonic wave, improve distribution network electric energy quality.
As a further improvement on the present invention, Sine Wave Pulse Width Modulation SPWM carrier cycles Tc=2n of each module ×
Ts, wherein n are the cascade module number of on-line operation.
As a further improvement on the present invention, it is described readjust after carrier cycle Tc=2 (N-P) × Ts.
As a further improvement on the present invention, 1≤P of the malfunctioning module quantity≤M.
Brief description of the drawings
Fig. 1 is high-voltage cascade type variable-frequency power sources control system of the present invention.
SPWM pulses generate sequential when Fig. 2 cascades variable-frequency power sources module normal operation for the present invention.
After Fig. 3 is present invention cascade variable-frequency power sources module failure, SPWM pulses generation sequential before control strategy optimization.
After Fig. 4 is present invention cascade variable-frequency power sources module failure, SPWM pulses generation sequential after control strategy optimization.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
As shown in figure 1, cascade variable-frequency power sources module control system is divided into master controller and each module bottom controller, its
In, master controller is responsible for sampling synchronization signals Ts generation, the calculating of SPWM dutycycles, bottom controller be responsible for Tc generation with
And SPWM waveform modulateds.
To cascade variable-frequency power sources module number as N=5, it is allowed to which exemplified by malfunctioning module number is M=1, the synchronized sampling cycle is
Ts, the Sine Wave Pulse Width Modulation of each module（SPWM）Carrier cycle is Tc, and relation be present：Tc=2n × Ts, n are on-line operation
Cascade module number；Initial time, on-line operation number of modules n=N, i.e. Tc=10Ts are set；Each module of master controller number consecutively,
It is defined as module 1, module 2, module 3, module 4, module 5, and according to number order, according to sample-synchronous frequency 1/Ts, successively
SPWM dutycycles are issued to modules, realize that each module exports the phase shifting control of SPWM waveforms.
Fig. 2 is that the pulse of each module generates sequential, the moment of t=0, and master controller calculates SPWM dutycycles and is simultaneously issued to module
1, module 1 generates module SPWM waveforms according to the dutycycle and carrier wave Tc；T=Ts moment, master controller calculate SPWM duties
Than and be issued to module 2, module 2 generates module SPWM waveforms according to the dutycycle；T=2Ts moment, master controller calculate
SPWM dutycycles are simultaneously issued to module 3, and module 3 generates module SPWM waveforms according to the dutycycle；T=3Ts moment, main control
Device calculates SPWM dutycycles and is issued to module 4, and module 4 generates module SPWM waveforms according to the dutycycle；T=4Ts moment,
Master controller calculates SPWM dutycycles and is issued to module 5, and module 5 generates module SPWM waveforms according to the dutycycle；t=5Ts
Moment, master controller calculate SPWM dutycycles and are issued to bottom module 1, and bottom module 1 generates the module according to the dutycycle
SPWM waveforms；T=6Ts moment, master controller calculate SPWM dutycycles and are issued to module 2, and module 2 generates according to the dutycycle
Module SPWM waveforms；T=7Ts moment, master controller calculate SPWM dutycycles and are issued to module 3, and module 3 is according to the duty
Than generating module SPWM waveforms；T=8Ts moment, master controller calculate SPWM dutycycles and are issued to module 4, the basis of module 4
The dutycycle generates module SPWM waveforms；T=9Ts moment, master controller calculate SPWM dutycycles and are issued to bottom module 5,
Bottom module 5 generates module SPWM waveforms according to the dutycycle；This is arrived, completes a cycle circulation, next sampling instant
Repeat said process.
When in high-voltage cascade type variable-frequency power sources module normal course of operation, when there is module failure, failure mould is set here
Block is module 2, and control strategy is as follows：
Step 1：The auto by pass of 2 bottom controller control module of module 2, it is out of service；Now, each mould before control strategy optimization
The pulse of block generates sequential as shown in Figure 3.
As shown in figure 3, after the SPWM waveforms for completing module 1 occur, due to exiting, it is necessary to wait 2 samplings for module 2
The SPWM waveforms that cycle T s could carry out the i.e. module 3 of next module occur, and so, cause whole high-voltage cascade variable-frequency power sources module
Output SPWM waveforms are being superimposed with discontinuously, produce extra high-frequency harmonic.
Step 2：Master controller failure judgement module position, and malfunctioning module quantity is counted, it is set as P, here P=1；
Step 3：Master controller keeps sample-synchronous cycle T s constant, meanwhile, faulting instruction and malfunctioning module number P are issued to
Each bottom controller；
Step 4：After each bottom controller receives fault message, carrier cycle Tc '=8 × Ts is readjusted；
Step 5：Master controller eliminates malfunctioning module, non-faulting module of resequencing, number consecutively module 1, module 2, module 3,
Module 4；
Step 6：Master controller is numbered according to new module, according to sample-synchronous frequency 1/Ts, is issued SPWM dutycycles successively and is arrived
Modules, the phase shifting control of each module output SPWM waveforms is realized, now, the pulse generation sequential of each module is as shown in Figure 4.
As shown in figure 4, the SPWM waveforms of each module generation are continuous, without time interval, so as to produce high frequency distortion
Component.
Compared with prior art, the beneficial effects of the present invention are by the optimization to phase-shifted SPWM control strategy,
After malfunctioning module is out of service, the continuity of the SPWM waveforms generation of each non-faulting module is still able to ensure that, so as to keep away
The high frequency distortion of high-voltage cascade variable-frequency power sources module output SPWM waveforms is exempted from, it is high to reduce the output of high-voltage cascade variable-frequency power sources module
Frequency harmonic wave, improve distribution network electric energy quality.
The invention is not limited in above-described embodiment, on the basis of technical scheme disclosed by the invention, the skill of this area
Art personnel are according to disclosed technology contents, it is not necessary to which performing creative labour can makes one to some of which technical characteristic
A little to replace and deform, these are replaced and deformation is within the scope of the present invention.
Claims (4)
1. a kind of high-voltage cascade type variable-frequency power sources module failure control method, cascade connection type variable-frequency power sources total number of modules is N, it is allowed to therefore
Barrier module number is M, and in sampling period Ts, the Sine Wave Pulse Width Modulation SPWM carrier cycles of each module are Tc, wherein, N, M is just
Integer, M<N, it is characterised in that high-voltage cascade type variable-frequency power sources module control system is divided into master controller and each module bottom control
Device processed, when module failure occurs in high-voltage cascade type variable-frequency power sources module, control strategy is as follows：
Step 1：Bottom controller controls malfunctioning module auto by pass, out of service；
Step 2：Master controller failure judgement module position, and malfunctioning module quantity is counted, it is set as P；
Step 3：Master controller keeps sample-synchronous cycle T s constant, meanwhile, faulting instruction and malfunctioning module number P are issued to
Each module bottom controller；
Step 4：After each bottom controller receives fault message, carrier cycle Tc is readjusted；
Step 5：Non-faulting module is numbered master controller, number consecutively module 1, module 2 ..., module N-P；
Step 6：Master controller is numbered according to new module, according to sample-synchronous frequency f=1/Ts, issues SPWM dutycycles successively
To modules, realize that each module exports the phase shifting control of SPWM waveforms.
2. according to the method for claim 1, it is characterised in that the Sine Wave Pulse Width Modulation SPWM carrier cycles of each module
Phase Tc=2n × Ts, wherein n are the cascade module number of on-line operation.
3. according to the method for claim 1, it is characterised in that it is described readjust after carrier cycle Tc=2 (N-P) ×
Ts。
4. according to the method for claim 1, it is characterised in that 1≤P of the malfunctioning module quantity≤M.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108427475A (en) * | 2018-02-02 | 2018-08-21 | 武汉大学 | A kind of extremely simple form SPWM digital generation systems and method based on impulse sampling |
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| CN101951134A (en) * | 2010-08-24 | 2011-01-19 | 艾默生网络能源有限公司 | Cascade topology frequency converter and bypass topology thereof |
| CN102075097A (en) * | 2010-11-29 | 2011-05-25 | 江苏省电力公司泰州供电公司 | Method for controlling n+1 fault redundancy of cascade type converter |
| CN103036610A (en) * | 2012-12-11 | 2013-04-10 | 上海交通大学 | Communication achieving method and system with redundant chain type energy storage system |
| CN203104278U (en) * | 2012-12-24 | 2013-07-31 | 珠海万力达电气股份有限公司 | Power unit bypass structure for cascaded multi-level converter |
| US9172298B2 (en) * | 2013-01-09 | 2015-10-27 | China Greatwall Computer Shenzhen Co., Ltd. | Fully-controlled bridge rectifying device with surge suppression function |
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2017
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951134A (en) * | 2010-08-24 | 2011-01-19 | 艾默生网络能源有限公司 | Cascade topology frequency converter and bypass topology thereof |
| CN102075097A (en) * | 2010-11-29 | 2011-05-25 | 江苏省电力公司泰州供电公司 | Method for controlling n+1 fault redundancy of cascade type converter |
| CN103036610A (en) * | 2012-12-11 | 2013-04-10 | 上海交通大学 | Communication achieving method and system with redundant chain type energy storage system |
| CN203104278U (en) * | 2012-12-24 | 2013-07-31 | 珠海万力达电气股份有限公司 | Power unit bypass structure for cascaded multi-level converter |
| US9172298B2 (en) * | 2013-01-09 | 2015-10-27 | China Greatwall Computer Shenzhen Co., Ltd. | Fully-controlled bridge rectifying device with surge suppression function |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108427475A (en) * | 2018-02-02 | 2018-08-21 | 武汉大学 | A kind of extremely simple form SPWM digital generation systems and method based on impulse sampling |
| CN108427475B (en) * | 2018-02-02 | 2021-06-08 | 武汉大学 | Extremely simple form SPWM digital generation system and method based on pulse sampling |
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Application publication date: 20180119 |