CN106849726A - Double droop control methods of three-phase four-leg inverter in parallel under uneven operating mode - Google Patents
Double droop control methods of three-phase four-leg inverter in parallel under uneven operating mode Download PDFInfo
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- CN106849726A CN106849726A CN201710125175.9A CN201710125175A CN106849726A CN 106849726 A CN106849726 A CN 106849726A CN 201710125175 A CN201710125175 A CN 201710125175A CN 106849726 A CN106849726 A CN 106849726A
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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
- H02M7/53873—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 with digital control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of double droop control methods of three-phase four-leg inverter in parallel under uneven operating mode, inverter output current is decomposed into forward-order current component and negative-sequence current component using symmetrical component method, then double droop controls are carried out respectively to positive sequence current component and negative-sequence current component, and three-phase four-leg inverter in parallel is respectively controlled using bridge arm control to first three bridge arm and four bridge legs.First three bridge arm of three-phase four-leg inverter in parallel is controlled by inverter output voltage, forward-order current component and negative-sequence current component using double droop controls, and four bridge legs are that current in middle wire is controlled by four bridge legs electric current.The present invention can export balanced voltage under uneven operating mode；The output current of three-phase four-leg inverter in parallel can be distributed by measure；Control method is simple and easy to apply, and mutually compatible with the control of traditional three-phase inverter；Had broad application prospects in fields such as new energy.
Description
Technical field
The present invention relates under electronic power converter modulation control field, especially a kind of uneven operating mode in parallel three
The operation of phase four-leg inverter and its control method.
Background technology
It is three-phase three-leg inverter parallel system that people's research is most commonly used in parallel system at present, but in reality
, it is necessary to inverter has the energy powered to balanced load, unbalanced load, linear load and nonlinear load simultaneously in the life of border
Power, and can cause the unbalanced phenomenon of output voltage during the band unbalanced load of traditional three-phase three-leg inverter.Now need
Output has holding altogether, that is, require that three-phase and four-line is exported.
Three-phase four-leg inverter receives the extensive concern and application of people, three-phase four-leg inverter with its superiority
It is to increase a bridge arm on the basis of common three-leg inverter to control neutral point voltage so as to produce three-phase independent voltage, tool
There is the ability with unbalanced load.The topology has the advantages of DC voltage utilization rate is high, and DC side input capacitance is small.Work as three-phase
During four-leg inverter band unbalanced load, not only need to be controlled inverter forward-order current, realize forward-order current by inverse
Become the distribution of device capacity, in addition it is also necessary to realize that inverter negative-sequence current and zero-sequence current are distributed by inverter capacity.And the three-phase of routine
Three-leg inverter parallel system may only with balanced load cannot with do not have in unbalanced load, therefore system negative phase-sequence electricity
Stream and zero-sequence current, now, need to only complete the control to forward-order current, it is not necessary to which negative-sequence current and zero-sequence current are carried out
Control.Therefore, the control stress point of three-phase four-leg inverter system in parallel is the control for realizing inverter negative phase-sequence and zero-sequence current.
At present, the control to three-phase four-leg inverter in parallel mainly has following several control methods：1. controlled using center
Device processed controls inverter ac busbar voltage, and current-order is assigned in each shunt chopper by CAN communication, so that
The stable operation of each three-phase four-leg inverter in parallel under uneven operating mode is realized, but this kind of control method needs communication
Line carries out information transfer；2. it is combined with the current uniform strategy of negative phase-sequence, zero sequence virtual impedance using positive-sequence power droop control
Control of the control realization to three-phase four-leg inverter in parallel；3. inverter output power is passed through using traditional droop control
Low pass filter is crossed again to be controlled three-phase four-arm device in parallel by droop control and three-dimensional space vector modulation, but this
Method have ignored the influence that negative-sequence current component and zero-sequence current component are caused to system.
Although above-mentioned control strategy can realize the stable operation of three-phase four-leg inverter in parallel, three-phase in parallel is caused
The modulation of four-leg inverter and control are complicated, cause system reliability to be lowered so that the popularization that have impact on such inverter and make
With.
The content of the invention
Realized to three-phase four-leg inverter positive-negative sequence current in parallel and zero-sequence current present invention aim at one kind is provided
Control, be easy to double droop control methods of three-phase four-leg inverter in parallel under compatible uneven operating mode.
To achieve the above object, following technical scheme is employed：Three-phase four-leg inverter of the present invention is by direct current
Voltage source Vdc1, three-phase four-leg inverter, LC wave filters, line impedance Zline1With one group of inversion that load R is sequentially connected composition
Device system, the three-phase four-arm structure in parallel is that each group of inverter system is cascaded into composition successively；
The control method is divided into two parts：
Part I is the control of first three bridge arm of three-phase four-leg inverter in parallel, to inverter output voltage and positive sequence
Current component is adjusted using droop control and inner ring, and entering line translation under negative synchronous rotating frame to negative-sequence current component obtains
DC quantity carries out power calculation with the voltage of inverter and obtains class power again, and class power is adjusted by droop control and inner ring again,
The modulating wave of two droop control generations controls in parallel three as the modulating wave of first three bridge arm of three-phase four-leg inverter in parallel
First three bridge arm of phase four-leg inverter, realizes the distribution of forward-order current and negative-sequence current；
Part II is the control of the four bridge legs of three-phase four-leg inverter in parallel, and four bridge legs electric current is integrated
Control controls four bridge legs by the modulated signal of virtual impedance acquisition four bridge legs again.
Further, the three-phase four-arm structure in parallel is by three-phase four-leg inverter A and three-phase four-leg inverter B
Compose in parallel；The three-phase four-leg inverter A is by direct voltage source Vdc1, first switch pipe Sa1, second switch pipe Sa2, the 3rd
Switching tube Sa3, the 4th switching tube Sa4, the 5th switching tube Sa5, the 6th switching tube Sa6, the 7th switching tube Sa7, the 8th switching tube Sa8、
First inductance La1, the second inductance Lb1, the 3rd inductance Lc1, the 4th inductance Ln1, the first electric capacity Ca1, the second electric capacity Cb1, the 3rd electric capacity
Cc1, the first impedance ZLa1, the second impedance ZLb1, the 3rd impedance ZLc1, the 4th impedance ZLn1, first load Ra, second load Rb, the 3rd
Load RcComposition；
Direct voltage source Vdc1Positive pole respectively with first switch pipe Sa1, the 3rd switching tube Sa3, the 5th switching tube Sa5, the 7th
Switching tube Sa7Colelctor electrode be connected, direct voltage source Vdc1Negative pole respectively with second switch pipe Sa2, the 4th switching tube Sa4, the 6th
Switching tube Sa6, the 8th switching tube Sa8Emitter stage be connected；
First switch pipe Sa1Emitter stage and second switch pipe Sa2Colelctor electrode be connected after with the first inductance La1One end phase
Even constitute the first bridge arm, the first inductance La1The other end respectively with the first impedance ZLa1One end, the first electric capacity Ca1One end phase
Even, the first impedance ZLa1The other end and first load RaOne end be connected, first load RaThe other end respectively with second load
Rb, the 3rd load Rc, the 4th impedance ZLn1It is connected, the first electric capacity Ca1The other end respectively with the second electric capacity Cb1, the 3rd electric capacity Cc1、
4th inductance Ln1One end, the 4th impedance other end are connected；
3rd switching tube Sa3Emitter stage and the 4th switching tube Sa4Colelctor electrode be connected after with the second inductance Lb1One end phase
Even constitute the second bridge arm, the second inductance Lb1The other end respectively with the second impedance ZLb1One end, the second electric capacity Cb1One end phase
Even, the second impedance ZLb1The other end and second load RbOne end be connected, second load RbThe other end respectively with first load
Ra, the 3rd load Rc, the 4th impedance ZLn1It is connected；Second electric capacity Cb1The other end respectively with the first electric capacity Ca1, the 3rd electric capacity Cc1、
4th inductance Ln1One end, the 4th impedance ZLn1The other end is connected；
5th switching tube Sa5Emitter stage and the 6th switching tube Sa6Colelctor electrode be connected after with the 3rd inductance Lc1One end phase
Even constitute the 3rd bridge arm, the 3rd inductance Lc1The other end respectively with the 3rd impedance ZLc1One end, the 3rd electric capacity Cc1One end phase
Even, the 3rd impedance ZLc1The other end and the 3rd load RcOne end be connected, the 3rd load RcThe other end respectively with first load
Ra, second load Rb, the 4th impedance ZLn1It is connected；3rd electric capacity Cc1The other end respectively with the first electric capacity Ca1, the second electric capacity Cb1、
4th inductance Ln1One end, the 4th impedance ZLn1The other end is connected；
7th switching tube Sa7Emitter stage and the 8th switching tube Sa8Colelctor electrode be connected after with the 4th inductance Ln1One end phase
Even constitute four bridge legs, the 4th inductance Ln1The other end respectively with the 4th impedance ZLn1, the first electric capacity Ca1, the second electric capacity Cb1,
Three electric capacity Cc1One end be connected, the 4th impedance ZLn1The other end respectively with first load Ra, second load Rb, the 3rd load Rc's
One end is connected；
The three-phase four-leg inverter B is by direct voltage source Vdc2, first switch pipe Sb1, second switch pipe Sb2, the 3rd
Switching tube Sb3, the 4th switching tube Sb4, the 5th switching tube Sb5, the 6th switching tube Sb6, the 7th switching tube Sb7, the 8th switching tube Sb8、
First inductance La2, the second inductance Lb2, the 3rd inductance Lc2, the 4th inductance Ln2, the first electric capacity Ca2, the second electric capacity Cb2, the 3rd electric capacity
Cc2, the first impedance ZLa2, the second impedance ZLb2, the 3rd impedance ZLc2, the 4th impedance ZLn2Composition；
Direct voltage source Vdc2Positive pole respectively with first switch pipe Sb1, the 3rd switching tube Sb3, the 5th switching tube Sb5, the 7th
Switching tube Sb7Colelctor electrode be connected, direct voltage source Vdc2Negative pole respectively with second switch pipe Sb2, the 4th switching tube Sb4, the 6th
Switching tube Sb6, the 8th switching tube Sb8Emitter stage be connected；
First switch pipe Sb1Emitter stage and second switch pipe Sb2Colelctor electrode be connected after with the first inductance La2One end phase
Even constitute the first bridge arm, the first inductance La2The other end respectively with the first impedance ZLa2One end, the first electric capacity Ca2One end phase
Even, the first impedance ZLa2The other end respectively with first load RaOne end, inverter A in the first impedance ZLa1One end be connected,
First electric capacity Ca2The other end respectively with the second electric capacity Cb2, the 3rd electric capacity Cc2, the 4th inductance Ln1One end, the 4th impedance ZLn2One end
It is connected；
3rd switching tube Sb3Emitter stage and the 4th switching tube Sb4Colelctor electrode be connected after with the second inductance Lb2One end phase
Even constitute the second bridge arm, the second inductance Lb2The other end respectively with the second impedance ZLb2One end, the second electric capacity Cb2One end phase
Even, the second impedance ZLb2The other end respectively with inverter A in second impedance one end ZLb1, second load RbOne end is connected；The
Two electric capacity Cb2The other end respectively with the first electric capacity Ca2, the 3rd electric capacity Cc2, the 4th inductance Ln1One end, the 4th impedance ZLn2One end phase
Even；
5th switching tube Sb5Emitter stage and the 6th switching tube Sb6Colelctor electrode be connected after with the 3rd inductance Lc2One end phase
Even constitute the 3rd bridge arm, the 3rd inductance Lc2The other end respectively with the 3rd impedance ZLc2One end, the 3rd electric capacity Cc2One end phase
Even, the 3rd impedance ZLc2The other end respectively with inverter A in the 3rd impedance ZLc1One end, the 3rd load RcOne end be connected；
3rd electric capacity Cc2The other end respectively with the first electric capacity Ca2, the second electric capacity Cb2, the 4th inductance Ln1One end, the 4th impedance ZLn2One end
It is connected；
7th switching tube Sb7Emitter stage and the 8th switching tube Sb8Colelctor electrode be connected after with the 4th inductance Ln2One end phase
Even constitute four bridge legs, the 4th inductance Ln2The other end respectively with the 4th impedance ZLn2, the first electric capacity Ca2, the second electric capacity Cb2,
Three electric capacity Cc2One end be connected, the 4th impedance ZLn2The other end respectively with the 4th impedance Z in inverter ALn1One end, the first load
Ra, second load Rb, the 3rd load RcOne end is connected；
First bridge arm of inverter A is in parallel with first bridge arm of inverter B；Second bridge arm of inverter A is with inverter B's
Second bridge arm is in parallel；3rd bridge arm of inverter A is in parallel with the 3rd bridge arm of inverter B；The four bridge legs of inverter A and inversion
The four bridge legs of device B are in parallel；The three-phase four-arm structure for cascading successively is constituted by that analogy.
Compared with prior art, the inventive method has the following advantages that：
1st, realize three-phase four-leg inverter each sequence electric current in parallel running to be distributed by inverter capacity, reduce simultaneously
Circulation between connection three-phase four-leg inverter, is realized to three-phase four-leg inverter in parallel by double droop control thoughts
Each sequence output current presses the distribution of shunt chopper capacity, and the three-phase voltage of balance can be exported under uneven operating mode.
2nd, can make the control between first three bridge arm of three-phase four-leg inverter in parallel and four bridge legs it is separate, mutually not
Interference, can control system simple, be easy to compatible with the control of traditional three-phase inverter.
Brief description of the drawings
Fig. 1 is the main circuit topology figure of parallel connection three-phase four-leg inverter of the invention.
Fig. 2 is three-phase four-leg inverter control structure figure of the present invention.
Fig. 3 is three-leg inverter control block diagram before parallel connection three-phase four-leg inverter of the invention.
Fig. 4 is parallel connection three-phase four-leg inverter four-leg inverter control block diagram of the invention.
Fig. 5 is parallel connection three-phase four-leg inverter entirety control strategy block diagram of the invention.
Specific embodiment
The present invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 is three-phase four-leg inverter main circuit topology in parallel, and the topology is by direct voltage source, three-phase four-arm inversion
Device, LC wave filters, line impedance and load are sequentially connected one group of inverter system of composition, and three-phase four-arm structure in parallel is will be every
One group of inverter system cascades composition successively.The three-phase four-leg inverter A is by direct voltage source Vdc1, first switch pipe
Sa1, second switch pipe Sa2, the 3rd switching tube Sa3, the 4th switching tube Sa4, the 5th switching tube Sa5, the 6th switching tube Sa6, the 7th open
Close pipe Sa7, the 8th switching tube Sa8, the first inductance La1, the second inductance Lb1, the 3rd inductance Lc1, the 4th inductance Ln1, the first electric capacity Ca1、
Second electric capacity Cb1, the 3rd electric capacity Cc1, the first impedance ZLa1, the second impedance ZLb1, the 3rd impedance ZLc1, the 4th impedance ZLn1, it is first negative
Carry Ra, second load Rb, the 3rd load RcComposition；
Direct voltage source Vdc1Positive pole respectively with first switch pipe Sa1, the 3rd switching tube Sa3, the 5th switching tube Sa5, the 7th
Switching tube Sa7Colelctor electrode be connected, direct voltage source Vdc1Negative pole respectively with second switch pipe Sa2, the 4th switching tube Sa4, the 6th
Switching tube Sa6, the 8th switching tube Sa8Emitter stage be connected；
First switch pipe Sa1Emitter stage and second switch pipe Sa2Colelctor electrode be connected after with the first inductance La1One end phase
Even constitute the first bridge arm, the first inductance La1The other end respectively with the first impedance ZLa1One end, the first electric capacity Ca1One end phase
Even, the first impedance ZLa1The other end and first load RaOne end be connected, first load RaThe other end respectively with second load
Rb, the 3rd load Rc, the 4th impedance ZLn1It is connected, the first electric capacity Ca1The other end respectively with the second electric capacity Cb1, the 3rd electric capacity Cc1、
4th inductance Ln1One end, the 4th impedance ZLn1The other end is connected；
3rd switching tube Sa3Emitter stage and the 4th switching tube Sa4Colelctor electrode be connected after with the second inductance Lb1One end phase
Even constitute the second bridge arm, the second inductance Lb1The other end respectively with the second impedance ZLb1One end, the second electric capacity Cb1One end phase
Even, the second impedance ZLb1The other end and second load RbOne end be connected, second load RbThe other end respectively with first load
Ra, the 3rd load Rc, the 4th impedance ZLn1It is connected；Second electric capacity Cb1The other end respectively with the first electric capacity Ca1, the 3rd electric capacity Cc1、
4th inductance Ln1One end, the 4th impedance ZLn1The other end is connected；
5th switching tube Sa5Emitter stage and the 6th switching tube Sa6Colelctor electrode be connected after with the 3rd inductance Lc1One end phase
Even constitute the 3rd bridge arm, the 3rd inductance Lc1The other end respectively with the 3rd impedance ZLc1One end, the 3rd electric capacity Cc1One end phase
Even, the 3rd impedance ZLc1The other end and the 3rd load RcOne end be connected, the 3rd load RcThe other end respectively with first load
Ra, second load Rb, the 4th impedance ZLn1It is connected；3rd electric capacity Cc1The other end respectively with the first electric capacity Ca1, the second electric capacity Cb1、
4th inductance Ln1One end, the 4th impedance ZLn1The other end is connected；
7th switching tube Sa7Emitter stage and the 8th switching tube Sa8Colelctor electrode be connected after with the 4th inductance Ln1One end phase
Even constitute four bridge legs, the 4th inductance Ln1The other end respectively with the 4th impedance ZLn1, the first electric capacity Ca1, the second electric capacity Cb1,
Three electric capacity Cc1One end be connected, the 4th impedance ZLn1The other end respectively with first load Ra, second load Rb, the 3rd load Rc's
One end is connected；
The three-phase four-leg inverter B is by direct voltage source Vdc2, first switch pipe Sb1, second switch pipe Sb2, the 3rd
Switching tube Sb3, the 4th switching tube Sb4, the 5th switching tube Sb5, the 6th switching tube Sb6, the 7th switching tube Sb7, the 8th switching tube Sb8、
First inductance La2, the second inductance Lb2, the 3rd inductance Lc2, the 4th inductance Ln2, the first electric capacity Ca2, the second electric capacity Cb2, the 3rd electric capacity
Cc2, the first impedance ZLa2, the second impedance ZLb2, the 3rd impedance ZLc2, the 4th impedance ZLn2Composition；
Direct voltage source Vdc2Positive pole respectively with first switch pipe Sb1, the 3rd switching tube Sb3, the 5th switching tube Sb5, the 7th
Switching tube Sb7Colelctor electrode be connected, direct voltage source Vdc2Negative pole respectively with second switch pipe Sb2, the 4th switching tube Sb4, the 6th
Switching tube Sb6, the 8th switching tube Sb8Emitter stage be connected；
First switch pipe Sb1Emitter stage and second switch pipe Sb2Colelctor electrode be connected after with the first inductance La2One end phase
Even constitute the first bridge arm, the first inductance La2The other end respectively with the first impedance ZLa2One end, the first electric capacity Ca2One end phase
Even, the first impedance ZLa2The other end respectively with first load RaOne end, inverter A in the first impedance ZLa1One end be connected,
First electric capacity Ca2The other end respectively with the second electric capacity Cb2, the 3rd electric capacity Cc2, the 4th inductance Ln1One end, the 4th impedance ZLn2One end
It is connected；
3rd switching tube Sb3Emitter stage and the 4th switching tube Sb4Colelctor electrode be connected after with the second inductance Lb2One end phase
Even constitute the second bridge arm, the second inductance Lb2The other end respectively with the second impedance ZLb2One end, the second electric capacity Cb2One end phase
Even, the second impedance ZLb2The other end respectively with inverter A in the second impedance ZLb1One end, the second load RbOne end is connected；The
Two electric capacity Cb2The other end respectively with the first electric capacity Ca2, the 3rd electric capacity Cc2, the 4th inductance Ln1One end, the 4th impedance ZLn2One end phase
Even；
5th switching tube Sb5Emitter stage and the 6th switching tube Sb6Colelctor electrode be connected after with the 3rd inductance Lc2One end phase
Even constitute the 3rd bridge arm, the 3rd inductance Lc2The other end respectively with the 3rd impedance ZLc2One end, the 3rd electric capacity Cc2One end phase
Even, the 3rd impedance ZLc2The other end respectively with inverter A in the 3rd impedance ZLc1One end, the 3rd load RcOne end be connected；
3rd electric capacity Cc2The other end respectively with the first electric capacity Ca2, the second electric capacity Cb2, the 4th inductance Ln1One end, the 4th impedance ZLn2One end
It is connected；
7th switching tube Sb7Emitter stage and the 8th switching tube Sb8Colelctor electrode be connected after with the 4th inductance Ln2One end phase
Even constitute four bridge legs, the 4th inductance Ln2The other end respectively with the 4th impedance ZLn2, the first electric capacity Ca2, the second electric capacity Cb2,
Three electric capacity Cc2One end be connected, the 4th impedance ZLn2The other end respectively with the 4th impedance one end in inverter A, the first load Ra、
Second load Rb, the 3rd load RcOne end is connected.
Fig. 2 be three-phase four-leg inverter control structure figure, k=+ in figure ,-, 0.ik、Respectively positive sequence,
The output voltage of negative phase-sequence and zero sequence, reference voltage, inductive current and inverter output current.GVS () is the biography of voltage control loop
Delivery function, GIS () is the transmission function of current regulator, GPWMS () is the equivalent gain of PWM.Because three-phase four-arm in parallel is inverse
It is balance to become device output voltage, therefore there was only positive sequence voltage component in output voltage, negative sequence voltage components and residual voltage
Component is all zero.Therefore the positive sequence of three-phase four-leg inverter in parallel, negative phase-sequence and zero sequence can be distinguished using symmetrical component method
It is controlled.
Fig. 3 is first three bridge arm control block diagram of three-phase four-leg inverter in parallel.Three-phase current is exported to inverter first
iabcForward-order current component is isolated using symmetrical component methodAnd negative-sequence current componentThen to inverter output voltage
uabcEnter line translation under positive synchronous rotating frame and obtain DC quantity and forward-order current componentIn positive synchronous rotating frame
Under enter line translation and obtain DC quantity to carry out power calculation, obtain power P Q1, then control to be referred to by droop control and inner ring
VoltageNegative-sequence current componentEnter line translation under negative synchronous rotating frame and obtain DC quantity and inverter output voltage
uabcEntering line translation under positive synchronous rotating frame and obtaining DC quantity carries out power calculation, the power P Q for obtaining2, but PQ2Not
It is the power output of actual inverter, therefore is called class power calculation, the class power that will be obtained is by droop control and inner ring
Control available reference voltageWithBoth additions obtain first three bridge arm and obtain modulating wave vref, eventually pass
PWM obtains the control pulse of first three bridge arm of three-phase four-leg inverter in parallel.
Fig. 4 is the four bridge legs control block diagram of three-phase four-leg inverter in parallel.Because the electric current that four bridge legs flow through is
Current in middle wire is 3 times of zero-sequence current, therefore control four bridge legs electric current is exactly to control zero-sequence current, needs not move through symmetrical components
Obtain zero-sequence current only need to be to that can obtain zero-sequence current in four bridge legs sampling.The is obtained to four bridge legs current sample first
Four bridge legs electric current inThen control is being integrated to it by virtual impedance, in order to carry out quick regulation to three-phase output voltage
Three-phase voltage sum is added in four bridge legs control.Finally obtain the tune of the four bridge legs of three-phase four-leg inverter in parallel
Ripple processed obtains the control pulse of the four bridge legs of three-phase four-leg inverter in parallel by PWM again.
Fig. 5 is the overall control strategy block diagram of three-phase four-leg inverter in parallel.Top half is three-phase four in parallel in figure
First three bridge arm control section of leg inverter, the latter half is the four bridge legs control section of three-phase four-leg inverter in parallel.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to model of the invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, those of ordinary skill in the art are to technical side of the invention
Various modifications and improvement that case is made, all should fall into the protection domain of claims of the present invention determination.
Claims (2)
1. under a kind of uneven operating mode three-phase four-leg inverter in parallel double droop control methods, it is characterised in that：Described three
Phase four-leg inverter is by direct voltage source Vdc1, three-phase four-leg inverter, LC wave filters, line impedance Zline1With load R
One group of inverter system of composition is sequentially connected, the three-phase four-arm structure in parallel is by each group of inverter system successively level
Connection is constituted；
The control method is divided into two parts：
Part I is the control of first three bridge arm of three-phase four-leg inverter in parallel, to inverter output voltage and forward-order current
Component is adjusted using droop control and inner ring, and entering line translation under negative synchronous rotating frame to negative-sequence current component obtains direct current
Amount carries out power calculation with the voltage of inverter and obtains class power again, and class power is adjusted by droop control and inner ring again, two
The modulating wave of droop control generation controls three-phase in parallel four as the modulating wave of first three bridge arm of three-phase four-leg inverter in parallel
First three bridge arm of leg inverter, realizes the distribution of forward-order current and negative-sequence current；
Part II is the control of the four bridge legs of three-phase four-leg inverter in parallel, and control is integrated to four bridge legs electric current
The modulated signal of four bridge legs is obtained by virtual impedance again to control four bridge legs.
2. under uneven operating mode according to claim 1 three-phase four-leg inverter in parallel double droop control methods, its
It is characterised by：The three-phase four-arm structure in parallel is by three-phase four-leg inverter A and three-phase four-leg inverter B and joint group
Into；The three-phase four-leg inverter A is by direct voltage source Vdc1, first switch pipe Sa1, second switch pipe Sa2, the 3rd switching tube
Sa3, the 4th switching tube Sa4, the 5th switching tube Sa5, the 6th switching tube Sa6, the 7th switching tube Sa7, the 8th switching tube Sa8, first electricity
Sense La1, the second inductance Lb1, the 3rd inductance Lc1, the 4th inductance Ln1, the first electric capacity Ca1, the second electric capacity Cb1, the 3rd electric capacity Cc1, first
Impedance ZLa1, the second impedance ZLb1, the 3rd impedance ZLc1, the 4th impedance ZLn1, first load Ra, second load Rb, the 3rd load RcGroup
Into；
Direct voltage source Vdc1Positive pole respectively with first switch pipe Sa1, the 3rd switching tube Sa3, the 5th switching tube Sa5, the 7th switch
Pipe Sa7Colelctor electrode be connected, direct voltage source Vdc1Negative pole respectively with second switch pipe Sa2, the 4th switching tube Sa4, the 6th switch
Pipe Sa6, the 8th switching tube Sa8Emitter stage be connected；
First switch pipe Sa1Emitter stage and second switch pipe Sa2Colelctor electrode be connected after with the first inductance La1One end be connected group
Into the first bridge arm, the first inductance La1The other end respectively with the first impedance ZLa1One end, the first electric capacity Ca1One end be connected, the
One impedance ZLa1The other end and first load RaOne end be connected, first load RaThe other end respectively with second load Rb,
Three load Rc, the 4th impedance ZLn1It is connected, the first electric capacity Ca1The other end respectively with the second electric capacity Cb1, the 3rd electric capacity Cc1, the 4th
Inductance Ln1One end, the 4th impedance ZLn1The other end is connected；
3rd switching tube Sa3Emitter stage and the 4th switching tube Sa4Colelctor electrode be connected after with the second inductance Lb1One end be connected group
Into the second bridge arm, the second inductance Lb1The other end respectively with the second impedance ZLb1One end, the second electric capacity Cb1One end be connected, the
Two impedance ZsLb1The other end and second load RbOne end be connected, second load RbThe other end respectively with first load Ra,
Three load Rc, the 4th impedance ZLn1It is connected；Second electric capacity Cb1The other end respectively with the first electric capacity Ca1, the 3rd electric capacity Cc1, the 4th
Inductance Ln1One end, the 4th impedance ZLn1The other end is connected；
5th switching tube Sa5Emitter stage and the 6th switching tube Sa6Colelctor electrode be connected after with the 3rd inductance Lc1One end be connected group
Into the 3rd bridge arm, the 3rd inductance Lc1The other end respectively with the 3rd impedance ZLc1One end, the 3rd electric capacity Cc1One end be connected, the
Three impedance ZsLc1The other end and the 3rd load RcOne end be connected, the 3rd load RcThe other end respectively with first load Ra,
Two load Rb, the 4th impedance ZLn1It is connected；3rd electric capacity Cc1The other end respectively with the first electric capacity Ca1, the second electric capacity Cb1, the 4th
Inductance Ln1One end, the 4th impedance ZLn1The other end is connected；
7th switching tube Sa7Emitter stage and the 8th switching tube Sa8Colelctor electrode be connected after with the 4th inductance Ln1One end be connected group
Into four bridge legs, the 4th inductance Ln1The other end respectively with the 4th impedance ZLn1, the first electric capacity Ca1, the second electric capacity Cb1, the 3rd electricity
Hold Cc1One end be connected, the 4th impedance ZLn1The other end respectively with first load Ra, second load Rb, the 3rd load RcOne end
It is connected；
The three-phase four-leg inverter B is by direct voltage source Vdc2, first switch pipe Sb1, second switch pipe Sb2, the 3rd switching tube
Sb3, the 4th switching tube Sb4, the 5th switching tube Sb5, the 6th switching tube Sb6, the 7th switching tube Sb7, the 8th switching tube Sb8, first electricity
Sense La2, the second inductance Lb2, the 3rd inductance Lc2, the 4th inductance Ln2, the first electric capacity Ca2, the second electric capacity Cb2, the 3rd electric capacity Cc2, first
Impedance ZLa2, the second impedance ZLb2, the 3rd impedance ZLc2, the 4th impedance ZLn2Composition；
Direct voltage source Vdc2Positive pole respectively with first switch pipe Sb1, the 3rd switching tube Sb3, the 5th switching tube Sb5, the 7th switch
Pipe Sb7Colelctor electrode be connected, direct voltage source Vdc2Negative pole respectively with second switch pipe Sb2, the 4th switching tube Sb4, the 6th switch
Pipe Sb6, the 8th switching tube Sb8Emitter stage be connected；
First switch pipe Sb1Emitter stage and second switch pipe Sb2Colelctor electrode be connected after with the first inductance La2One end be connected group
Into the first bridge arm, the first inductance La2The other end respectively with the first impedance ZLa2One end, the first electric capacity Ca2One end be connected, the
One impedance ZLa2The other end respectively with first load RaOne end, inverter A in the first impedance ZLa1One end be connected, first electricity
Hold Ca2The other end respectively with the second electric capacity Cb2, the 3rd electric capacity Cc2, the 4th inductance Ln1One end, the 4th impedance ZLn2One end is connected；
3rd switching tube Sb3Emitter stage and the 4th switching tube Sb4Colelctor electrode be connected after with the second inductance Lb2One end be connected group
Into the second bridge arm, the second inductance Lb2The other end respectively with the second impedance ZLb2One end, the second electric capacity Cb2One end be connected, the
Two impedance ZsLb2The other end respectively with inverter A in second impedance one end ZLb1, second load RbOne end is connected；Second electric capacity
Cb2The other end respectively with the first electric capacity Ca2, the 3rd electric capacity Cc2, the 4th inductance Ln1One end, the 4th impedance ZLn2One end is connected；
5th switching tube Sb5Emitter stage and the 6th switching tube Sb6Colelctor electrode be connected after with the 3rd inductance Lc2One end be connected group
Into the 3rd bridge arm, the 3rd inductance Lc2The other end respectively with the 3rd impedance ZLc2One end, the 3rd electric capacity Cc2One end be connected, the
Three impedance ZsLc2The other end respectively with inverter A in the 3rd impedance ZLc1One end, the 3rd load RcOne end be connected；3rd electricity
Hold Cc2The other end respectively with the first electric capacity Ca2, the second electric capacity Cb2, the 4th inductance Ln1One end, the 4th impedance ZLn2One end is connected；
7th switching tube Sb7Emitter stage and the 8th switching tube Sb8Colelctor electrode be connected after with the 4th inductance Ln2One end be connected group
Into four bridge legs, the 4th inductance Ln2The other end respectively with the 4th impedance ZLn2, the first electric capacity Ca2, the second electric capacity Cb2, the 3rd electricity
Hold Cc2One end be connected, the 4th impedance ZLn2The other end respectively with the 4th impedance Z in inverter ALn1One end, the first load Ra、
Second load Rb, the 3rd load RcOne end is connected；
First bridge arm of inverter A is in parallel with first bridge arm of inverter B；Second bridge arm of inverter A and the second of inverter B
Bridge arm is in parallel；3rd bridge arm of inverter A is in parallel with the 3rd bridge arm of inverter B；The four bridge legs of inverter A and inverter B
Four bridge legs it is in parallel；The three-phase four-arm structure for cascading successively is constituted by that analogy.
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| CN116054618A (en) * | 2023-01-17 | 2023-05-02 | 西安千帆翼科技合伙企业(有限合伙) | Staggered parallel four-phase four-bridge arm inverter circuit |
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| CN111509725A (en) * | 2020-05-09 | 2020-08-07 | 云南电网有限责任公司电力科学研究院 | Voltage recovery control method for parallel common coupling point of three-phase four-wire system converter |
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| CN113691157A (en) * | 2021-08-30 | 2021-11-23 | 燕山大学 | Rotation discontinuous control method for modular multilevel converter |
| CN115642825A (en) * | 2022-11-02 | 2023-01-24 | 江苏科曜能源科技有限公司 | Three-phase five-level PWM inverter and application |
| CN116054618A (en) * | 2023-01-17 | 2023-05-02 | 西安千帆翼科技合伙企业(有限合伙) | Staggered parallel four-phase four-bridge arm inverter circuit |
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