CN107276444A - Redundancy fault-tolerant PWM method and the modular series connection inverter based on this method - Google Patents
Redundancy fault-tolerant PWM method and the modular series connection inverter based on this method Download PDFInfo
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- CN107276444A CN107276444A CN201710433453.7A CN201710433453A CN107276444A CN 107276444 A CN107276444 A CN 107276444A CN 201710433453 A CN201710433453 A CN 201710433453A CN 107276444 A CN107276444 A CN 107276444A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention discloses a kind of redundancy fault-tolerant PWM method, and binding modules series inverter control strategy first determines the modulation wave signal of each submodule；Then according to the redundancy submodule quantity contained in modular series connection inverter topology, the amplitude of each submodule triangular carrier is determined；The control wave of the submodule, and then the switching state of control submodule are determined with corresponding triangle carrier signal finally according to the modulation wave signal of submodule.The invention also discloses the modular series connection inverter based on the modulator approach.The triangular carrier quantity of the inventive method is equal with submodule quantity, when there is redundancy submodule without carrying out cycle assignment to carrier wave, the control difficulty to sub- module switch device is simplified, while reducing unnecessary on off state, the switching frequency of submodule is reduced；The inverter of the present invention, without the handoff procedure of traditional normal submodule and redundancy submodule, reduces the disturbance caused to system when submodule breaks down.
Description
Technical field
The invention belongs to field of power electronics, more particularly, to a kind of redundancy fault-tolerant PWM method and based on this method
Modular series connection inverter.
Background technology
Recent decades, along with developing rapidly for Power Electronic Technique, based on full control property device for power switching such as IGBT
Voltage source converter (voltage source converter, VSC) is widely used in power system, wherein multilevel
The features such as utensil has harmonic wave of output voltage content is low, switching loss is small, be applicable voltage class high, in large-power occasions as high
Press the field advantages such as direct current transportation (high-voltage direct current, HVDC), mesohigh power quality controlling bright
It is aobvious.
Modular series connection inverter is due to modular construction of its topology using height, it is easy to extension system and realize redundancy
Control, output voltage waveforms good the advantages of low with switching frequency has become the pillar of current multi-level converter application
Strength.But, each of modular series connection inverter is formed by multiple completely identical in structure sub-module cascades, output function
Submodule is largely relied on, once there is submodule to break down, the normal work of modular series connection inverter will be influenceed,
So as to reduce the reliability of system operation.Therefore, it is necessary to a number of redundancy submodule be set, when submodule breaks down
When can be replaced in time, it is ensured that modular series connection inverter can normally be run.In actual applications, in order to realize modularization
The efficient protection of series inverter, all submodules (including redundancy submodule) are usually devoted oneself to work and be not provided with special superfluous
Minor module, is bypassed after submodule breaks down, and input redundancy submodule is replaced, so as to ensure that whole system is quick
Recover.
For modular series connection inverter, the selection of modulation strategy directly affects its output characteristics.It is common at present
Modulator approach has nearest level to approach modulation (nearest level modulation, NLM), carrier wave stacking PWM
(carrier disposition-PWM, CD-PWM) and phase-shifting carrier wave PWM (carrier phase-shifted
PWM, CPS-PWM).Phase-shifting carrier wave PWM is good due to its dynamic response performance, output harmonic wave characteristic good, and is easy to reference to additional
Control, is widely used in engineering.But traditional phase-shifting carrier wave PWM technologies are compared by modulating wave with carrier wave
The break-make of switching device in submodule is relatively determined, therefore carrier number is corresponded with the submodule quantity that each phase is put into.It will pass
When phase-shifting carrier wave of uniting PWM is applied to the modular series connection inverter containing redundancy submodule, because modular series connection inverter is every
There is redundancy submodule in one phase, and redundancy submodule participates in switching, therefore submodule number and carrier wave during whole service
Number can not be corresponded.In order to ensure the normal output of modular series connection inverter, it is necessary to carrier wave be carried out into cycle assignment, thus
Generate the switching device in some problems such as submodule and can produce unnecessary switch motion and increase its switching loss, increase
Control difficulty to the switching device in submodule etc..
The content of the invention
It is an object of the invention to provide a kind of redundancy fault-tolerant PWM method and the modular series connection inversion based on this method
Device, without carrying out cycle assignment to carrier wave.
The technical solution for realizing the object of the invention is：A kind of redundancy fault-tolerant PWM method, for redundancy
The modular series connection inverter of module, comprises the following steps：
Step 1：Binding modules series inverter control strategy determines the modulation wave signal of each submodule；
Step 2：According to the redundancy submodule quantity contained in modular series connection inverter topology, each submodule triangle is determined
The amplitude of carrier wave, specifically：
The minimum value A of triangular carrier amplitudeminKeep constant, maximum AmaxDetermine have by redundancy submodule quantity：
Wherein, N is normal-sub number of modules, and M is redundancy submodule number；
Step 3：The control arteries and veins of the submodule is determined according to the modulation wave signal of submodule and corresponding triangle carrier signal
Rush signal, and then the switching state of control submodule.
Control strategy is capacitor voltage balance control strategy in the step 1, gathers each submodule DC capacitor voltage
Value, is multiplied with the sign function of each submodule electric current of inflow after it is compared with voltage instruction value and obtains correcting modulation wave signal.
Amendment modulation wave signal is normalized afterwards, the modulation wave signal of input PWM algorithm is used as.
The specific method of the step 3 determination sub-module control wave is：When the modulation wave signal of submodule is more than
During corresponding carrier signal, control wave output high level；When the modulation wave signal of submodule is believed less than corresponding carrier wave
Number when, control wave output low level.
Modular series connection inverter based on the modulator approach, the modular series connection inverter device topology is N+1 level
Single-phase cascaded H-bridges structure or N+1 level three-phase MMC structures, for the single-phase cascaded H-bridges structure of N+1 level, topology is by N number of normal
Submodule and M redundancy submodule are in series, for N+1 level three-phase MMC structures, each identical by two up and down
Bridge arm constitute, each bridge arm is in series by N number of normal submodule and M redundancy submodule and inductance, the normal-sub
Module is identical with redundancy submodule structure, by the full-bridge or half-bridge structure and direct current of the IGBT compositions with anti-paralleled diode
Electric capacity C is constituted.
Each submodule output port by-pass switch S in parallel, S is off when submodule is normally run, submodule hair
S closures make its out of service during raw failure.
Compared with prior art, its remarkable advantage is the present invention：1) the triangular carrier quantity in modulator approach of the present invention with
Submodule quantity is equal, when there is redundancy submodule without carrying out cycle assignment to carrier wave, simplifies to sub- module switch device
The control difficulty of part, while reducing unnecessary on off state, reduces the switching frequency of submodule；2) modularization of the present invention
Series inverter when submodule breaks down can by directly close by-pass switch cut off malfunctioning module, without it is traditional just
The handoff procedure of normal submodule and redundancy submodule, reduces the disturbance caused to system.
Brief description of the drawings
Fig. 1 is the topological diagram of modular series connection inverter of the present invention.
Fig. 2 is the theory diagram of modulator approach of the present invention.
Fig. 3 is the oscillogram of modulator approach intermediate cam carrier wave of the present invention and modulating wave.
Fig. 4 is the working method figure of modulator approach Neutron module of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment, the present invention program is expanded on further.
Fig. 1 is the topological diagram of modular series connection inverter, and modular series connection inverter topology is the single-phase Cascade H of N+1 level
Bridge structure or N+1 level three-phase MMC structures, respectively as shown in Fig. 1 (a) and Fig. 1 (b).For the single-phase Cascade H of N+1 level
Bridge structure, topology is in series by N number of normal submodule and M redundancy submodule；And for N+1 level three-phase MMC structures, often
One is made up of two identical bridge arms up and down, and each bridge arm is by N number of normal submodule and M redundancy submodule and electricity
Sense is in series.Normal submodule is identical with redundancy submodule structure, for the single-phase cascaded H-bridges structure of N+1 level, by with anti-
The full bridge structure and DC capacitor C compositions of the IGBT compositions of parallel diode；For N+1 level three-phase MMC structures, then by with
The half-bridge structure and DC capacitor C compositions of the IGBT compositions of anti-paralleled diode.For the full bridge structure in Fig. 1 (b), adjusting
It can be treated when processed as two half-bridge structures.Each submodule output port is parallel with by-pass switch S, and submodule is normally run
When S be off, S is then closed when submodule breaks down makes its out of service.
As shown in Fig. 2 the redundancy fault-tolerant PWM method of modular series connection inverter, comprises the following steps：
Step 1：Binding modules series inverter control strategy determines the modulation wave signal of each submodule；
Control strategy is capacitor voltage balance control strategy in the step 1, by controlling direct current in each submodule
The voltage of appearance makes its track reference value, so as to adjust the energy distribution of each submodule, reduces DC capacitor voltage fluctuation.Electric capacity
Voltage balancing control strategy gathers each submodule DC capacitor voltage value, with flowing into each submodule after being compared with voltage instruction value
The sign function of electric current, which is multiplied, to be obtained correcting modulation wave signal, and above-mentioned amendment modulation wave signal is by normalization computing, as rear
The modulation wave signal of continuous incoming carrier phase-shift PWM modulator approach.
Step 2：According to the redundancy submodule quantity contained in modular series connection inverter topology, each submodule triangle is determined
The amplitude of carrier wave, specific method is：The minimum value A of triangular carrier amplitudeminKeep constant, maximum AmaxBy redundancy submodule number
Amount is determined, that is, is had：
Wherein, N is normal-sub number of modules, and M is redundancy submodule number.
Compared to traditional phase-shifting carrier wave PWM method, it thes improvement is that the minimum value of triangular carrier amplitude is protected
Hold -1 constant, and the maximum of triangular carrier amplitude by containing redundancy submodule quantity calculate and determine.Meanwhile, triangular carrier letter
Number quantity corresponded with including all submodules including redundancy submodule.
In figure 3, N=10, M=2, the phase of triangular carrier stagger π/(N+M)=π/12 successively, triangular carrier amplitude
Minimum value AminKeep -1 constant, maximumAlthough from figure 3, it can be seen that the triangular carrier
Quantity be N+M, but within M/ (N+M) the section time of each carrier cycle, the maximum A of triangular carrier amplitudemaxAll the time it is big
In 1, carrier signal is consistently greater than modulation wave signal, and submodule control wave maintains low level.By adjusting submodule etc.
Effect ON time causes submodule to switch between normal work and redundant state, it is ensured that modular series connection inverter is exported
Level number is still (N+1).When some submodule in bridge arm breaks down, the bypass that can directly close in submodule is opened
Closing S makes its out of service, without conventional replacement switching operation, because the corresponding triangular carrier of modulator approach control submodule is dynamic
State is adjusted, and obvious disturbance will not be caused to system.
When conventional carrier phase-shift PWM modulator approach is applied to the MMC topologys of (N+M) individual submodule, in order to ensure modularization
Series inverter output level number is (N+1), and the quantity of triangular carrier needs to be fixed as N.And in the modulator approach, triangle
The quantity of carrier wave is no longer fixed as N, and is consistent i.e. N+M with submodule sum, as shown in Figure 4.Thus can be effective
Reduction to the control difficulty of switching device while, unnecessary on off state is reduced, so as to reduce work(in each submodule
The switching frequency f of rate devicec, that is, have：
Wherein, fc0For using the switching frequency of power device in submodule during conventional carrier phase-shift PWM modulator approach.
Step 3：Believed according to modulation wave signal with the control pulse of the triangle carrier signal determination sub-module of corresponding submodule
Number, and then the switching state of control submodule, specific method is：When the modulation wave signal of j-th of submodule is more than corresponding carry
During ripple signal, control wave output high level；When the modulation wave signal of j-th of submodule is less than corresponding carrier signal
When, control wave output low level.
Claims (6)
1. a kind of redundancy fault-tolerant PWM method, it is characterised in that the modulator approach is used for the module with redundancy submodule
Change series inverter, comprise the following steps：
Step 1：Binding modules series inverter control strategy determines the modulation wave signal of each submodule；
Step 2：According to the redundancy submodule quantity contained in modular series connection inverter topology, each submodule triangular carrier is determined
Amplitude, specifically：
The minimum value A of triangular carrier amplitudeminKeep constant, maximum AmaxDetermine have by redundancy submodule quantity：
<mrow>
<msub>
<mi>A</mi>
<mi>max</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mn>2</mn>
<mrow>
<mo>(</mo>
<mi>N</mi>
<mo>+</mo>
<mi>M</mi>
<mo>)</mo>
</mrow>
</mrow>
<mi>N</mi>
</mfrac>
<mo>-</mo>
<mn>1</mn>
</mrow>
Wherein, N is normal-sub number of modules, and M is redundancy submodule number；
Step 3：The control pulse letter of the submodule is determined according to the modulation wave signal of submodule and corresponding triangle carrier signal
Number, and then the switching state of control submodule.
2. redundancy fault-tolerant PWM method according to claim 1, it is characterised in that control strategy is in the step 1
Capacitor voltage balance control strategy, gathers each submodule DC capacitor voltage value, with stream after it is compared with voltage instruction value
The sign function multiplication for entering each submodule electric current obtains correcting modulation wave signal.
3. redundancy fault-tolerant PWM method according to claim 2, it is characterised in that the step 1 pair corrects modulating wave
Signal is normalized, and is used as the modulation wave signal of input PWM algorithm.
4. redundancy fault-tolerant PWM method according to claim 1, it is characterised in that the step 3 determination sub-module control
The specific method of pulse signal processed is：When the modulation wave signal of submodule is more than corresponding carrier signal, control wave
Export high level；When the modulation wave signal of submodule is less than corresponding carrier signal, control wave output low level.
5. using the modular series connection inverter of the modulator approach described in claim 1-4 any one, it is characterised in that described
Modular series connection inverter device topology is the single-phase cascaded H-bridges structure of N+1 level or N+1 level three-phase MMC structures, for N+1 electricity
Single-phase cascaded H-bridges structure is equalled, topology is in series by N number of normal submodule and M redundancy submodule, for N+1 level three-phases
MMC structures, each to be made up of two identical bridge arms up and down, each bridge arm is by N number of normal submodule and M redundancy
Module and inductance are in series, and the normal submodule is identical with redundancy submodule structure, by with anti-paralleled diode
IGBT composition full-bridge or half-bridge structure and DC capacitor C composition.
6. modular series connection inverter according to claim 5, it is characterised in that each submodule output port parallel connection bypass
S is switched, S is off when submodule is normally run, S closures make its out of service when submodule breaks down.
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| CN201910128711.XA CN109818518B (en) | 2017-06-09 | 2017-06-09 | Modularized series inverter |
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| CN111342637A (en) * | 2018-12-19 | 2020-06-26 | 南京南瑞继保电气有限公司 | Rapid voltage-sharing method of cascade multilevel converter |
| CN110311543A (en) * | 2019-07-26 | 2019-10-08 | 中国矿业大学(北京) | Topology reconstruction and its power-factor angle calculation method when cascaded H-bridges converter failure |
| CN110311543B (en) * | 2019-07-26 | 2020-02-07 | 中国矿业大学(北京) | Topology reconstruction and power factor angle calculation method for cascade H-bridge converter during fault |
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| CN107276444B (en) | 2019-06-04 |
| CN109818518A (en) | 2019-05-28 |
| CN109818518B (en) | 2020-08-11 |
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