CN103956928B - Method for controlling voltage of direct current capacitors in double-output and three-switch-set MMC inverter - Google Patents
Method for controlling voltage of direct current capacitors in double-output and three-switch-set MMC inverter Download PDFInfo
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- CN103956928B CN103956928B CN201410145647.3A CN201410145647A CN103956928B CN 103956928 B CN103956928 B CN 103956928B CN 201410145647 A CN201410145647 A CN 201410145647A CN 103956928 B CN103956928 B CN 103956928B
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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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
-
- 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
- H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
-
- 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
- H02M7/487—Neutral point clamped inverters
Abstract
The invention provides a method for controlling voltage of direct current capacitors in a double-output and three-switch-set MMC inverter. The method comprises the step of controlling the voltage of the direct current capacitors of power switch units of the upper switch set, the middle switch set and the lower switch set, and the step of sampling the voltage of the direct current capacitors of the power switch units of the upper switch set, the middle switch set and the lower switch set and stabilizing the voltage of the direct current capacitors of the power switch units through voltage feedback and PI adjustment. According to the method, the voltage of the direct current capacitors in the double-output, one-phase and three-switch-set MMC inverter is balanced and stabilized, the double-output, one-phase and three-switch-set MMC inverter can have two paths of N+1 electrical level alternating current output, the quality of the output current waveform is very high, the voltage stress borne by each switch tube in the power switch units is only 1/N of the direct current bus voltage, the voltages borne by all the switch tubes are equal in the working process of a converter, and the voltage-sharing problem of the switch tubes is solved very well.
Description
Technical field
The present invention relates to many level of block combiner（MMC）The control field of converter DC capacitor voltage, and in particular to one
Plant the control method of the switches set MMC inverter DC capacitor voltage of dual output three.
Background technology
The single-phase three switches sets MMC inverter of dual output has the exchange output of two-way N+1 level, and output current wave quality is very
Height, the voltage stress that each switching tube bears in power switch unit is only the 1/N of DC bus-bar voltage, while can guarantee that conversion
The voltage that all switching tubes bear in the device course of work is equal, and the voltage-sharing of switching tube is solved well.With existing list
The switch converters of phase three compare, and the two-way output of the single-phase three switches sets MMC inverter of dual output provided by the present invention is N
+ 1 level exchange output, the quality for exporting AC wave shape is greatly improved.Additionally, the voltage for bearing of each switching tube should
Power is only the 1/N of DC bus-bar voltage, and control method provided by the present invention makes all switching tubes in the converter course of work
The voltage for bearing is equal, and the voltage-sharing of switching tube is solved well, and this will be very beneficial for single-phase three switches set of dual output
Application of the MMC inverter in high pressure and large-power occasions.Compared with existing MMC converters, lose-lose provided by the present invention
Go out single-phase three switches sets MMC inverter and there is two-way exchange output, can be directly used for the phase of the alternating current circuit of two different frequencies
Even, engineering cost is greatly reduced.
The voltage of DC capacitor must be balanced in the single-phase three switches sets MMC inverter of dual output, and this is to ensure dual output list
The basic premise of the switches set MMC inverter normal work of phase three.However, the control of the DC capacitor of existing MMC converters at present
Method processed is not particularly suited for the single-phase three switches sets MMC inverter of dual output.
The content of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, a kind of switches set MMC inversion of dual output three is proposed
The control method of device DC capacitor voltage, concrete technical scheme is as follows.
A kind of control method of the switches set MMC inverter DC capacitor voltage of dual output three, including to upper switches set, in open
The voltage control of the DC capacitor of the power switch unit of switches set under Guan Zuhe；J-th power switch of switches set in sampling
The voltage of the DC capacitor of unit and the electric current for flowing through switches set, are adjusted by Voltage Feedback and PI, stably go up switches set
The value of the voltage of the DC capacitor of j-th power switch unit, wherein j is 1 ~ N；J-th power of sampling breaker in middle group is opened
The voltage for closing the DC capacitor of unit and the electric current for flowing through breaker in middle group, are adjusted by Voltage Feedback and PI, stable breaker in middle group
J-th power switch unit DC capacitor voltage；The DC capacitor of j-th power switch unit of the lower switches set of sampling
Voltage and flow through the electric current of lower switches set, adjusted by Voltage Feedback and PI, stably descend j-th power switch list of switches set
The voltage of the DC capacitor of unit.
In the voltage control of the DC capacitor of j-th power switch unit of the upper switches set, reference voltage is deducted
The voltage of the DC capacitor of j-th power switch unit of switches set, is then adjusted by PI, obtains j-th of switches set
The error amplification signal of the DC capacitor voltage of power switch unit；The electric current of switches set is flow through by sign function, work as stream
When the electric current for crossing switches set is more than 0, sign function is output as 1；When the electric current for flowing through upper switches set is less than 0, sign function
It is output as -1；The error amplification signal of the DC capacitor voltage of j-th power switch unit of upper switches set is multiplied by sign function,
Then it is divided by valueU dc /2Voltage, obtain the normalization error amplification signal of j-th power switch unit of switches set；The
The actual reference voltage for exporting all the way is divided by valueU dc /2Voltage, obtain the first via output normalization reference voltage；First
The normalization reference voltage of road output adds 1/3, and deducts the normalization error of j-th power switch unit of switches set and put
Big signal, obtains the normalization reference signal of j-th power switch unit of switches set；J-th power of upper switches set is opened
The normalization reference signal and j-th carrier wave for closing unit passes through comparator, j-th power switch unit of switches set in generation
The control level of second switch pipe, when the normalization reference signal of j-th power switch unit of upper switches set is carried more than j-th
During ripple, the level that controls of the second switch pipe of j-th power switch unit of upper switches set is high level；When the of upper switches set
When the normalization reference signal of j power switch unit is less than j-th carrier wave, j-th power switch unit of upper switches set
The level that controls of second switch pipe is low level.
In the voltage control of the DC capacitor of j-th power switch unit of the breaker in middle group, during reference voltage is deducted
The voltage of the DC capacitor of j-th power switch unit of switches set, is then adjusted by PI, obtains j-th of breaker in middle group
The error amplification signal of the DC capacitor voltage of power switch unit；The electric current of breaker in middle group is flow through by sign function, work as stream
When the electric current for crossing breaker in middle group is more than 0, sign function is output as 1；When the electric current for flowing through breaker in middle group is less than 0, sign function
It is output as -1；The error amplification signal of the DC capacitor voltage of j-th power switch unit of breaker in middle group is multiplied by sign function,
Then it is divided by valueU dc /2Voltage, obtain the normalization error amplification signal of j-th power switch unit of breaker in middle group；The
The actual reference voltage for exporting all the way is divided by valueU dc /2Voltage, obtain the first via output normalization reference voltage；First
The normalization reference voltage of road output adds 1/3, and the normalization error plus j-th power switch unit of breaker in middle group is put
Big signal, obtains the first normalization reference signal of j-th power switch unit of breaker in middle group；J-th work(of breaker in middle group
First normalization reference signal of rate switch element is with j-th carrier wave by comparator, j-th power switch of central switches set
When first normalization reference signal of unit is more than j-th carrier wave, the comparator output high level；J-th of central switches set
When first normalization reference signal of power switch unit is less than j-th carrier wave, the comparator output low level；Second tunnel exports
Actual reference voltage be divided by valueU dc /2Voltage, obtain the second tunnel output normalization reference voltage；The output of second tunnel
Reference voltage is normalized plus 1/3, and deducts the normalization error amplification signal of j-th power switch unit of breaker in middle group,
Obtain the second normalization reference signal of j-th power switch unit of breaker in middle group；J-th power switch list of breaker in middle group
By comparator, j-th power switch unit of central switches set is returned for second normalization reference signal of unit and j-th carrier wave
When one change reference signal is more than j-th carrier wave, comparator output high level；J-th power switch unit of central switches set
The second normalization reference signal when being less than j-th carrier wave, comparator output low level；The output of described two comparators is led to
XOR gate is crossed, the control level of the second switch pipe of j-th power switch unit of breaker in middle group is produced.
In the voltage control of the DC capacitor of j-th power switch unit of the lower switches set, reference voltage is deducted down
The voltage of the DC capacitor of j-th power switch unit of switches set, is then adjusted by PI, obtains j-th of lower switches set
The error amplification signal of the DC capacitor voltage of power switch unit；The electric current of lower switches set is flow through by sign function, work as stream
When the electric current for crossing down switches set is more than 0, sign function is output as 1；When the electric current for flowing through lower switches set is less than 0, sign function
It is output as -1；The error amplification signal of the DC capacitor voltage of j-th power switch unit of lower switches set is multiplied by sign function,
Then it is divided by valueU dc /2Voltage, obtain the normalization error amplification signal of j-th power switch unit of lower switches set；The
Two tunnels output actual reference voltage be divided by valueU dc /2Voltage, obtain the second tunnel output normalization reference voltage；Second
The normalization reference voltage of road output deducts 1/3, and deducts the normalization error of j-th power switch unit of lower switches set and put
Big signal, obtains the normalization reference signal of j-th power switch unit of lower switches set；J-th power of lower switches set is opened
The normalization reference signal and j-th carrier wave for closing unit passes through comparator, produces j-th power switch unit of lower switches set
The control level of second switch pipe, instantly the normalization reference signal of j-th power switch unit of switches set is less than j-th load
During ripple, the level that controls of the second switch pipe of j-th power switch unit of lower switches set is high level；Instantly the of switches set
When the normalization reference signal of j power switch unit is more than j-th carrier wave, j-th power switch unit of lower switches set
The level that controls of second switch pipe is low level.
The present invention have the advantage that for：It is balanced and stabilize DC capacitor in the single-phase three switches sets MMC inverter of dual output
Voltage, it is ensured that the single-phase three switches sets MMC inverter normal work of dual output.Guarantee the single-phase three switches sets MMC inversion of dual output
Utensil has the exchange output of two-way N+1 level, and output current wave is of high quality, and each switching tube bears in power switch unit
Voltage stress is only the 1/N of DC bus-bar voltage, while can guarantee that the voltage that all switching tubes bear in the converter course of work
It is equal, the voltage-sharing of switching tube is solved well.
Description of the drawings
Fig. 1 is the circuit structure diagram of the single-phase three switches sets MMC inverter of dual output；
Fig. 2 is the circuit structure diagram of the power switch unit of the single-phase three switches sets MMC inverter of dual output shown in Fig. 1；
Fig. 3 a, 3b, 3c, 3d are respectively four kinds of operation modes of the power switch unit shown in Fig. 2；
Fig. 4 is the control of the 2nd switching tube of j-th power switch unit of upper switches set, breaker in middle group and lower switches set
Level diagram processed；
Fig. 5 a, 5b, 5c are respectively the direct currents of j-th power switch unit of upper switches set, breaker in middle group and lower switches set
The control block diagram of electric capacity；
Fig. 6 is the simulation waveform that the control method of the present invention is used for the single-phase level MMC inverter of three switches set five of dual output
Figure.
Specific embodiment
For present disclosure and feature is expanded on further, specific embodiments of the present invention are carried out below in conjunction with accompanying drawing
Illustrate, but the enforcement not limited to this of the present invention.
With reference to Fig. 1, the single-phase three switches sets MMC inverter of dual output, including dc sourceU dc , the first electric capacityC 1 , it is second electric
HoldC 2 , the 3rd electric capacityC 3 , switch bridge arm, first load and second load；It is described switch bridge arm by upper switches set H, breaker in middle group M,
Lower switches set L and coupling inductance（L H :L L ）It is in series；Upper switches set H is by N number of power switch unit（SMH1、SMH2、…、SMHN）
It is in series, breaker in middle group M is by N number of power switch unit（SMM1、SMM2、…、SMMN）It is in series, lower switches set L is by N number of work(
Rate switch element（SML1、SML2、…、SMLN）It is in series；One end of the first load is connected to the first electric capacityC 1 , the second electric capacityC 2 's
Midpoint, another upper end for terminating to breaker in middle group M of the first loado；One end of the second load is connected to the second electric capacityC 2 , it is the 3rd electric
HoldC 3 Midpoint, second load another lower end for terminating to breaker in middle group Mp；The two ends of the first load export as the first via,
The two ends of the second load export as the second tunnel, and N is positive integer.
Fig. 2 illustrates the circuit structure of the power switch unit of the single-phase three switches sets MMC inverter of the dual output shown in Fig. 1
Figure.Power switch unit is by first switch pipeS 1 , second switch pipeS 2 , the first diodeD 1 , the second diodeD 2 And electric capacityC SM 。
Wherein, electric capacityC SM Positive pole and first switch pipeS 1 Colelctor electrode, the first diodeD 1 Negative electrode connection, first switch pipeS 1 's
Emitter stage and the first diodeD 1 Anode, second switch pipeS 2 Colelctor electrode, the second diodeD 2 Negative electrode connection, second opens
Guan GuanS 2 Emitter stage and the second diodeD 2 Anode, electric capacityC SM Negative pole connection；Second switch pipeS 2 Colelctor electrode as
One output end, second switch pipeS 2 Emitter stage as the second output end.
The power switch unit of the single-phase three switches sets MMC inverter of dual output shown in Fig. 2 has four kinds of operation modes, such as
Shown in Fig. 3 a, 3b, 3c and 3d.
Mode 1：First switch pipeS 1 It is open-minded, second switch pipeS 2 Shut-off, electric current passes through the first diodeD 1 Flow into electric capacityC SM , electric capacityC SM Charge, electric capacityC SM Voltage is raised, as shown in Figure 3 a；
Mode 2：First switch pipeS 1 It is open-minded, second switch pipeS 2 Shut-off, electric current passes through first switch pipeS 1 Flow out electric capacityC SM , electric capacityC SM Electric discharge, electric capacityC SM Voltage is reduced, as shown in Figure 3 b；
Mode 3：First switch pipeS 1 Shut-off, second switch pipeS 2 Open-minded, electric current passes through second switch pipeS 2 , electric capacityC SM Quilt
Bypass, electric capacityC SM Voltage is constant, as shown in Figure 3 c；
Mode 4：First switch pipeS 1 Shut-off, second switch pipeS 2 Open-minded, electric current passes through the second diodeD 2 , electric capacityC SM Quilt
Bypass, electric capacityC SM Voltage is constant, as shown in Figure 3 c.
Fig. 4 illustrates the 2nd switching tube of j-th power switch unit of switches set, breaker in middle group and lower switches setS 2
Control level diagram.The modulating wave of first via outputR a + 1/3 superposition one is on the occasion of j-th power that increased switches set is opened
Close the second switch pipe of unitS 2 Service time；The modulating wave of the second tunnel outputR b + 1/3 one negative value of superposition, increased down and opens
The second switch pipe of j-th power switch unit of pass groupS 2 Service time；The modulating wave of first via outputR a + 1/3 superposition one
Individual negative value, the modulating wave of the second tunnel outputR b + 1/3 superposition one is on the occasion of increased j-th power switch unit of breaker in middle group
Second switch pipeS 2 Service time.
When DC capacitor voltage is less than reference voltage, when increase DC capacitor charging interval or reduction DC capacitor discharge
Between, i.e., increase first switch pipe when the electric current for flowing through the DC capacitor place switches set is more than 0S 1 Service time with reduce
Second switch pipeS 2 Service time, when flow through the DC capacitor place switches set electric current be less than 0 when reduce first switch pipeS 1
Service time with increase second switch pipeS 2 Service time；When DC capacitor voltage is higher than reference voltage, reduce direct current
Capacitor charging time or increase DC capacitor discharge time, i.e., when the electric current for flowing through the DC capacitor place switches set is more than 0
Reduce first switch pipeS 1 Service time with increase second switch pipeS 2 Service time, open when flowing through the DC capacitor and being located
The electric current of pass group increases first switch pipe when being less than 0S 1 Service time with reduce second switch pipeS 2 Service time.
The control method of the single-phase three switches sets MMC inverter DC capacitor voltage of dual output, including upper switches set, breaker in middle
The voltage control of the DC capacitor of the power switch unit of group and lower switches set；J-th power switch list of switches set in sampling
First SMHjDC capacitor voltagev HCj With the electric current for flowing through upper switches seti H , adjusted by Voltage Feedback and PI, it is stable on open
The voltage of the DC capacitor of j-th power switch unit of pass group, the wherein value of j are 1 ~ N；J-th of sampling breaker in middle group
Power switch unit SMMjDC capacitor voltagev MCj With the electric current for flowing through breaker in middle groupi M , adjusted by Voltage Feedback and PI
Section, j-th power switch unit SM of stable breaker in middle groupMjDC capacitor voltage；J-th power of the lower switches set of sampling
Switch element SMLjDC capacitor voltagev LCj With the electric current for flowing through lower switches seti L , adjusted by Voltage Feedback and PI, surely
Fix j-th power switch unit SM of switches setLjDC capacitor voltage.
As shown in Figure 5 a, j-th power switch unit SM of the upper switches setHjDC capacitor voltage control in,
Reference voltageV Cref Deduct j-th power switch unit SM of switches setHjDC capacitor voltagev HCj , then by PI
Adjust, obtain j-th power switch unit SM of switches setHjDC capacitor voltage error amplification signal△v HCj ；Flow through
The electric current of upper switches seti H By sign functionsign, when the electric current for flowing through upper switches seti H During more than 0, sign functionsignIt is defeated
Go out for 1；When the electric current for flowing through upper switches seti H During less than 0, sign function is output as -1；J-th power switch of upper switches set
Cell S MHjDC capacitor voltage error amplification signal△v HCj It is multiplied by sign functionsign, then it is divided by valueU dc /2's
Voltage, obtains j-th power switch unit SM of switches setHjNormalization error amplification signal△v * HCj ；The first via is exported
Actual reference voltageR a It is divided by valueU dc /2Voltage, obtain the first via output normalization reference voltageR * a ；The first via is defeated
The normalization reference voltage for going outR * a Plus 1/3, and deduct j-th power switch unit SM of switches setHjNormalization error
Amplify signal△v * HCj , obtain j-th power switch unit SM of switches setHjNormalization reference signalv * HCj ；Upper switch
J-th power switch unit SM of groupHjNormalization reference signalv * HCj With j-th carrier waveC j By comparator, open in generation
J-th power switch unit SM of pass groupHjSecond switch pipeS 2 Control levelS Hj , when j-th power of upper switches set is opened
Close cell S MHjNormalization reference signalv * HCj More than j-th carrier waveC j When, j-th power switch unit SM of upper switches setHj
Second switch pipeS 2 Control levelS Hj For high level；As j-th power switch unit SM of upper switches setHjNormalization ginseng
Examine signalv * HCj Less than j-th carrier waveC j When, j-th power switch unit SM of upper switches setHjSecond switch pipeS 2 Control
LevelS Hj For low level.
As shown in Figure 5 b, j-th power switch unit SM of the breaker in middle groupHjDC capacitor voltage control in,
Reference voltageV Cref Deduct j-th power switch unit SM of breaker in middle groupMjDC capacitor voltagev MCj , then by PI
Adjust, obtain j-th power switch unit SM of breaker in middle groupMjDC capacitor voltage error amplification signal△v MCj ；Flow through
The electric current of breaker in middle groupi M By sign functionsign, when the electric current for flowing through breaker in middle groupi M During more than 0, sign functionsignIt is defeated
Go out for 1；When the electric current for flowing through breaker in middle groupi M During less than 0, sign function is output as -1；J-th power switch of breaker in middle group
Cell S MMjDC capacitor voltage error amplification signal△v MCj It is multiplied by sign functionsign, then it is divided by valueU dc /2's
Voltage, obtains j-th power switch unit SM of breaker in middle groupMjNormalization error amplification signal△v * MCj ；The first via is exported
Actual reference voltageR a It is divided by valueU dc /2Voltage, obtain the first via output normalization reference voltageR * a ；The first via is defeated
The normalization reference voltage for going outR * a Plus 1/3, and plus j-th power switch unit SM of breaker in middle groupMjNormalization error
Amplify signal△v * MCj , obtain j-th power switch unit SM of breaker in middle groupMjFirst normalization reference signalv * MCjH ；In
J-th power switch unit SM of switches setMjFirst normalization reference signalv * MCjH With j-th carrier waveC j By comparator,
J-th power switch unit SM of central switches setMjFirst normalization reference signalv * MCjH More than j-th carrier waveC j When, should
Comparator exports high level；J-th power switch unit SM of central switches setMjFirst normalization reference signalv * MCjH It is little
In j-th carrier waveC j When, the comparator output low level；The actual reference voltage of the second tunnel outputR b It is divided by valueU dc /2Electricity
Pressure, obtains the normalization reference voltage of the second tunnel outputR * b ；The normalization reference voltage of the second tunnel outputR * b Plus 1/3, and subtract
Remove j-th power switch unit SM of breaker in middle groupMjNormalization error amplification signal△v * MCj , obtain the jth of breaker in middle group
Individual power switch unit SMMjSecond normalization reference signalv * MCjL ；J-th power switch unit SM of breaker in middle groupMj
Two normalization reference signalsv * MCjL With j-th carrier waveC j By comparator, j-th power switch unit SM of central switches setMj
Normalization reference signalv * MCjH More than j-th carrier waveC j When, the comparator output high level；J-th work(of central switches set
Rate switch element SMMjSecond normalization reference signalv * MCjL Less than j-th carrier waveC j When, the comparator output low level；Institute
The output of two comparators is stated by XOR gate, j-th power switch unit SM of breaker in middle group is producedMjSecond switch pipeS 2
Control level S Mj 。
As shown in Figure 5 c, j-th power switch unit SM of the lower switches setLjDC capacitor voltage control in,
Reference voltageV Cref Deduct j-th power switch unit SM of lower switches setLjDC capacitor voltagev LCj , then by PI
Adjust, obtain j-th power switch unit SM of lower switches setLjDC capacitor voltage error amplification signal△v LCj ；Flow through
The electric current of lower switches seti L By sign functionsign, when the electric current for flowing through lower switches seti L During more than 0, sign functionsignIt is defeated
Go out for 1；When the electric current for flowing through lower switches seti L During less than 0, sign function is output as -1；J-th power switch of lower switches set
Cell S MLjDC capacitor voltage error amplification signal△v LCj It is multiplied by sign functionsign, then it is divided by valueU dc /2's
Voltage, obtains j-th power switch unit SM of lower switches setLjNormalization error amplification signal△v * LCj ；Second tunnel exports
Actual reference voltageR b It is divided by valueU dc /2Voltage, obtain the second tunnel output normalization reference voltageR * b ；Second road is defeated
The normalization reference voltage for going outR * b 1/3 is deducted, and deducts j-th power switch unit SM of lower switches setLjNormalization error
Amplify signal△v * LCj , obtain j-th power switch unit SM of lower switches setLjNormalization reference signalv * LCj ；Lower switch
J-th power switch unit SM of groupLjNormalization reference signalv * LCj With j-th carrier waveC j By opening under comparator, generation
J-th power switch unit SM of pass groupLjSecond switch pipeS 2 Control levelS Lj , instantly j-th power of switches set open
Close cell S MLjNormalization reference signalv * LCj Less than j-th carrier waveC j When, j-th power switch unit SM of lower switches setLj
Second switch pipeS 2 Control levelS Lj For high level；Instantly j-th power switch unit SM of switches setLjNormalization ginseng
Examine signalv * LCj More than j-th carrier waveC j When, j-th power switch unit SM of lower switches setLjSecond switch pipeS 2 Control
LevelS Lj For low level.
With the single-phase level MMC inverter of three switches set five of dual output（N=4）As a example by, Fig. 6 a, 6b illustrate that it uses the present invention
Control method simulation waveform.As shown in Figure 6 a, it is successively the voltage of first via output（v a ）, the first via output electric current
（i a ）, the second tunnel output voltage（v b ）, the second tunnel output electric current（i b ）, it is successively four of upper switches set as shown in Figure 6 b
DC capacitor voltage（v CH1 、v CH2 、v CH3 、v CH4 ）, breaker in middle group four DC capacitor voltages（v CM1 、v CM2 、v CM3 、v CM4 ）, under
Four DC capacitor voltages of switches set（v CL1 、v CL2 、v CL3 、v CL4 ）, switches set, breaker in middle group and lower switch are gone up as seen from the figure
The voltage of each DC capacitor of group has obtained stable well, demonstrates the validity of the control method of the present invention.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention not by the embodiment
Limit, other any Spirit Essences without departing from the present invention and the change, modification, replacement made under principle, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (3)
1. the control method of the single-phase three switches sets MMC inverter DC capacitor voltage of dual output, it is characterised in that：Including to above opening
The voltage control of the DC capacitor of the power switch unit of pass group, breaker in middle group and lower switches set；J-th of switches set in sampling
Power switch unit（SMHj）DC capacitor voltage（v HCj ）With the electric current for flowing through upper switches set（i H ）, by Voltage Feedback and
PI is adjusted, and stably goes up the voltage of the DC capacitor of j-th power switch unit of switches set, upper switches set, breaker in middle group and under
Switches set is in series respectively by N number of power switch unit, and wherein the value of j is 1 ~ N；J-th power of sampling breaker in middle group
Switch element（SMMj）DC capacitor voltage（v MCj ）With the electric current for flowing through breaker in middle group（i M ）, adjusted by Voltage Feedback and PI
Section, j-th power switch unit of stable breaker in middle group（SMMj）DC capacitor voltage；J-th work(of the lower switches set of sampling
Rate switch element（SMLj）DC capacitor voltage（v LCj ）With the electric current for flowing through lower switches set（i L ）, by Voltage Feedback and PI
Adjust, stably descend j-th power switch unit of switches set（SMLj）DC capacitor voltage；The jth of described pair of upper switches set
Individual power switch unit（SMHj）DC capacitor voltage control in, reference voltage（V Cref ）Deduct j-th work(of switches set
Rate switch element（SMHj）DC capacitor voltage（v HCj ）, then being adjusted by PI, j-th power for obtaining switches set is opened
Close unit（SMHj）DC capacitor voltage error amplification signal（△v HCj ）；Flow through the electric current of switches set（i H ）By symbol
Function（sign）, when the electric current for flowing through upper switches set（i H ）During more than 0, sign function（sign）It is output as 1；When flowing through upper switch
The electric current of group（i H ）During less than 0, sign function is output as -1；J-th power switch unit of upper switches set（SMHj）Direct current
Hold the error amplification signal of voltage（△v HCj ）It is multiplied by sign function（sign）, then it is divided by valueU dc /2Voltage, obtain out
J-th power switch unit of pass group（SMHj）Normalization error amplification signal（△v * HCj ）；The first via output of inverter
Actual reference voltage（R a ）It is divided by valueU dc /2Voltage, obtain the first via output normalization reference voltage（R * a ）；The first via
The normalization reference voltage of output（R * a ）Plus 1/3, and deduct j-th power switch unit of switches set（SMHj）Normalizing
Change error amplification signal（△v * HCj ）, obtain j-th power switch unit of switches set（SMHj）Normalization reference signal
（v * HCj ）；J-th power switch unit of upper switches set（SMHj）Normalization reference signal（v * HCj ）With j-th carrier wave（C j ）It is logical
Comparator is crossed, j-th power switch unit of switches set in generation（SMHj）Second switch pipe（S 2 ）Control level（S Hj ）,
When j-th power switch unit of upper switches set（SMHj）Normalization reference signal（v * HCj ）More than j-th carrier wave（C j ）When,
J-th power switch unit of upper switches set（SMHj）Second switch pipe（S 2 ）Control level（S Hj ）For high level；When above opening
J-th power switch unit of pass group（SMHj）Normalization reference signal（v * HCj ）Less than j-th carrier wave（C j ）When, upper switch
J-th power switch unit of group（SMHj）Second switch pipe（S 2 ）Control level（S Hj ）For low level；The power switch
Unit is made up of first switch pipe, second switch pipe, the first diode, the second diode and electric capacity；Wherein, the positive pole of electric capacity with
The anode of the negative electrode connection of the colelctor electrode of first switch pipe, the first diode, the emitter stage of first switch pipe and the first diode,
The anode of the negative electrode connection of the colelctor electrode of second switch pipe, the second diode, the emitter stage of second switch pipe and the second diode,
The negative pole connection of electric capacity；The colelctor electrode of second switch pipe is used as the first output end, and the emitter stage of second switch pipe is defeated as second
Go out end.
2. the control method of the single-phase three switches sets MMC inverter DC capacitor voltage of dual output according to claim 1, its
It is characterised by：J-th power switch unit of the breaker in middle group（SMMj）DC capacitor voltage control in, reference voltage
（V Cref ）Deduct j-th power switch unit of breaker in middle group（SMMj）DC capacitor voltage（v MCj ）, then adjusted by PI
Section, obtains j-th power switch unit of breaker in middle group（SMMj）DC capacitor voltage error amplification signal（△v MCj ）；Stream
Cross the electric current of breaker in middle group（i M ）By sign function（sign）, when the electric current for flowing through breaker in middle group（i M ）During more than 0, symbol letter
Number（sign）It is output as 1；When the electric current for flowing through breaker in middle group（i M ）During less than 0, sign function is output as -1；The of breaker in middle group
J power switch unit（SMMj）DC capacitor voltage error amplification signal（△v MCj ）It is multiplied by sign function（sign）, so
It is divided by value afterwardsU dc /2Voltage, obtain j-th power switch unit of breaker in middle group（SMMj）Normalization error amplify letter
Number（△v * MCj ）；The actual reference voltage of first via output（R a ）It is divided by valueU dc /2Voltage, obtain the first via output return
One changes reference voltage（R * a ）；The normalization reference voltage of first via output（R * a ）Plus 1/3, and plus j-th of breaker in middle group
Power switch unit（SMMj）Normalization error amplification signal（△v * MCj ）, obtain j-th power switch unit of breaker in middle group
（SMMj）First normalization reference signal（v * MCjH ）；J-th power switch unit of breaker in middle group（SMMj）First normalization
Reference signal（v * MCjH ）With j-th carrier wave（C j ）By first comparator, j-th power switch unit of central switches set
（SMMj）First normalization reference signal（v * MCjH ）More than j-th carrier wave（C j ）When, first comparator output high level；It is central
J-th power switch unit of switches set（SMMj）First normalization reference signal（v * MCjH ）Less than j-th carrier wave（C j ）When,
First comparator exports low level；The actual reference voltage of the second tunnel output of inverter（R b ）It is divided by valueU dc /2Voltage,
Obtain the normalization reference voltage of the second tunnel output（R * b ）；The normalization reference voltage of the second tunnel output（R * b ）Deduct 1/3, and
Deduct j-th power switch unit of breaker in middle group（SMMj）Normalization error amplification signal（△v * MCj ）, obtain breaker in middle group
J-th power switch unit（SMMj）Second normalization reference signal（v * MCjL ）；J-th power switch list of breaker in middle group
Unit（SMMj）Second normalization reference signal（v * MCjL ）With j-th carrier wave（C j ）By the second comparator, the of central switches set
J power switch unit（SMMj）Second normalization reference signal（v * MCjL ）More than j-th carrier wave（C j ）When, the second comparator
Output low level；J-th power switch unit of central switches set（SMMj）Second normalization reference signal（v * MCjL ）It is less than
J-th carrier wave（C j ）When, the second comparator output high level；The output of first comparator and the second comparator passes through XOR gate,
Produce j-th power switch unit of breaker in middle group（SMMj）Second switch pipe（S 2 ）Control level（S Mj ）.
3. the control method of the single-phase three switches sets MMC inverter DC capacitor voltage of dual output according to claim 1, its
It is characterised by：J-th power switch unit of the lower switches set（SMLj）DC capacitor voltage control in, reference voltage
（V Cref ）Deduct j-th power switch unit of lower switches set（SMLj）DC capacitor voltage（v LCj ）, then adjusted by PI
Section, obtains j-th power switch unit of lower switches set（SMLj）DC capacitor voltage error amplification signal（△v LCj ）；Stream
Cross down the electric current of switches set（i L ）By sign function（sign）, when the electric current for flowing through lower switches set（i L ）During more than 0, symbol letter
Number（sign）It is output as 1；When the electric current for flowing through lower switches set（i L ）During less than 0, sign function is output as -1；The of lower switches set
J power switch unit（SMLj）DC capacitor voltage error amplification signal（△v LCj ）It is multiplied by sign function（sign）, so
It is divided by value afterwardsU dc /2Voltage, obtain j-th power switch unit of lower switches set（SMLj）Normalization error amplify letter
Number（△v * LCj ）；The actual reference voltage of the second tunnel output（R b ）It is divided by valueU dc /2Voltage, obtain the second tunnel output return
One changes reference voltage（R * b ）；The normalization reference voltage of the second tunnel output（R * b ）1/3 is deducted, and is added j-th of upper and lower switches set
Power switch unit（SMLj）Normalization error amplification signal（△v * LCj ）, obtain j-th power switch unit of lower switches set
（SMLj）Normalization reference signal（v * LCj ）；J-th power switch unit of lower switches set（SMLj）Normalization reference signal
（v * LCj ）With j-th carrier wave（C j ）By comparator, j-th power switch unit of lower switches set is produced（SMLj）Second open
Guan Guan（S 2 ）Control level（S Lj ）, j-th power switch unit of switches set instantly（SMLj）Normalization reference signal
（v * LCj ）Less than j-th carrier wave（C j ）When, j-th power switch unit of lower switches set（SMLj）Second switch pipe（S 2 ）Control
Level processed（S Lj ）For high level；Instantly j-th power switch unit of switches set（SMLj）Normalization reference signal（v * LCj ）Greatly
In j-th carrier wave（C j ）When, j-th power switch unit of lower switches set（SMLj）Second switch pipe（S 2 ）Control level
（S Lj ）For low level.
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