CN107800318A - A kind of control method of grid-connected inverter and system - Google Patents
A kind of control method of grid-connected inverter and system Download PDFInfo
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- CN107800318A CN107800318A CN201710656216.7A CN201710656216A CN107800318A CN 107800318 A CN107800318 A CN 107800318A CN 201710656216 A CN201710656216 A CN 201710656216A CN 107800318 A CN107800318 A CN 107800318A
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The present invention discloses a kind of control method of grid-connected inverter and system, is three-phase alternating current by the inversion of photovoltaic DC electricity, power distribution network is connected to by LC wave filters.The LC wave filters of inverter outlet side can be used to filter out higher hamonic wave.When combining inverter normal work, inverter is six Switch Three-Phase inverter circuits；When the power device in combining inverter breaks down, reconstruct its topological structure, when short circuit or open fault occur for the power switch of i.e. a certain phase bridge arm, fuse corresponding fuse, disconnect failure bridge arm, and corresponding triac is connected, four Switch Three-Phase inverter circuits are formed, to keep systems stay normal operation.System uses sagging voltage x current three close-loop control method, with reference to fault-tolerant pulsing algorithm, forms the control method of Fault tolerant inverter.Corresponding device for power switching make-and-break signal is provided, conversion and control algorithm is not needed when system is switched to malfunction operation by normal condition, greatly improves the reliability and stability of system.
Description
Technical field
The present invention relates to electric and electronic technical field, specifically a kind of control method of grid-connected inverter and system.
Background technology
Due to becoming increasingly conspicuous for energy crisis and environmental problem, distributed power source DG (distributed generation)
Obtain fast development.Quite a few distributed power generation unit directly or with the form of load composition microgrid is connect by inverter
Enter power distribution network.
Under micro-grid connection operational mode, because the distribution source of declining is by grid-connected inverters, if inverter breaks down, respectively
Flow increasing or the choked flow effect of the fault current of individual micro- source convection current overprotection can cause original false protection or tripping, difference protection
Between cooperation can also fail.Traditional processing method is excision microgrid, although this can greatly protect the safety of power distribution network,
But the reliability of power supply and the efficiency of microgrid be have impact on.
The important component of inverter is inverter.Inverter circuit has a variety of forms of the composition, mainly have full-bridge type and
Semibridge system.The device for forming inverter bridge arm switch is mainly the switch elements such as GTR, IGBT, MOSFET, when controlling switch element
In turn during turn-on and turn-off, then the square-wave voltage of frequency-adjustable is obtained；When control inverter is in PWM (or SPWM, SVPWM) mode
During work, then the alternating voltage close to sinusoidal is obtained.The place that generation accident is easiest in inverter is exactly power switch device
Part, also enough it could not effectively handle its integrity problem well at present.It can cause whole system not when inverter produces accident
Energy normal work, will cause inconceivable consequence when serious.Therefore it is required that improve reliability of the inverter in the accident of generation.
The content of the invention
The present invention is intended to provide a kind of control method of grid-connected inverter and system, after fault power switching device is cut off,
The power supply of remaining device for power switching of combining inverter and DC side is reconstituted into three-phase inverting circuit, is not required to conversion and control
Method, system continuous service can be kept, improve inverter reliability.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of control method of grid-connected inverter, and
Net inverter includes the tie point of the dc source composition of two series connection, and the tie point is in parallel with grid-connected inverter circuit；
Three output ends of the grid-connected inverter circuit are respectively connected with a LC wave filter；This method comprises the following steps：
1) grid-connected inverter circuit output voltage u is gatheredca,ucb,uccWith output current ioa,iob,ioc, by following two formula
Calculate active-power P and reactive power Q：
2) given active-power P is set*With given reactive power Q*, by given active-power P*, given reactive power Q*Point
Do not subtract each other with active-power P, the reactive power Q being calculated；Given frequency ω is set*With given inverter output voltage amplitude
U*, then have：Angular frequency value ω=ω*+m(P*-P)；Voltage magnitude U=U*+n(Q*-Q)；Wherein m, n are sagging coefficient；Combine
To combining inverter reference output voltage U sin ω t, U sin (ω t-120 °), U sin (ω t+120 °)；
3) by combining inverter reference output voltage U sin ω t, U sin (ω t-120 °), U sin (ω t+120 °) with
The combining inverter output voltage u collectedca,ucb,uccCorresponding to subtract each other, obtained difference obtains simultaneously after the modulation of PI controllers
Net inverter refers to output current iorefa,iorefb,iorefc；
1) combining inverter is referred into output current iorefa,iorefb,iorefcWith the combining inverter output current collected
ioa,iob,iocSubtract each other, obtained difference obtains the input signal of PWM demodulator, by PWM after the modulation of PI controllers
After modulation, by fault-tolerant pulse signal algorithm, the final trigger signal of combining inverter device for power switching is obtained.Fault-tolerant pulse
Signal algorithm is as shown in Figure 2.6 road pulse signal S are produced by PWMv1-Sv6.According to 6 device for power switching V1-V6Break-make
Situation, judges whether each road pulse signal needs to change.Fault-tolerant pulse signal algorithm is as follows：
If V1 and V5 break down simultaneously, due to V2 and V4 is reconstructed in same bridge arm, it is therefore desirable to which V4 is replaced
The V5 of failure, therefore by V4 pulse Sv4Value be assigned to V4 pulse Sv5, other pulse signals are constant, then export finally
Fault-tolerant pulse signal Sv1-Sv6；
If V2 and V4 break down simultaneously, due to V1 and V5 is reconstructed in same bridge arm, it is therefore desirable to which V5 is replaced
The V4 of failure, therefore by V5 pulse Sv5Value be assigned to V5 pulse Sv4, other pulse signals are constant, then export finally
Fault-tolerant pulse signal Sv1-Sv6；
If V2 and V6 break down simultaneously, due to V3 and V5 is reconstructed in same bridge arm, it is therefore desirable to which V3 is replaced
The V2 of failure, therefore by V2 pulse Sv2Value be assigned to V3 pulse Sv3, other pulse signals are constant, then export finally
Fault-tolerant pulse signal Sv1-Sv6；
If V3 and V5 break down simultaneously, due to V2 and V6 is reconstructed in same bridge arm, it is therefore desirable to which V2 is replaced
The V3 of failure, therefore by V3 pulse Sv3Value be assigned to V2 pulse Sv2, other pulse signals are constant, then export finally
Fault-tolerant pulse signal Sv1-Sv6；
V1 and V6 are broken down simultaneously, due to V3 and V4 is reconstructed in same bridge arm, it is therefore desirable to which V3 is replaced into event
The V1 of barrier, therefore by V1 pulse Sv1Value be assigned to V3 pulse Sv3, other pulse signals are constant, then export final appearance
Wrong pulse signal Sv1-Sv6；
If V3 and V4 break down simultaneously, due to V1 and V6 is reconstructed in same bridge arm, it is therefore desirable to which V1 is replaced
The V3 of failure, therefore by V3 pulse Sv3Value be assigned to V1 pulse Sv1, other pulse signals are constant, then export finally
Fault-tolerant pulse signal Sv1-Sv6；
Other failure situations do not change original pulse signal.Control need not be changed after fault of converter reconstruct to calculate
Method.
In the present invention, m=0.00005, n=0.00007.
Correspondingly, the invention provides a kind of combining inverter control system, it includes：
Acquisition module：For gathering grid-connected inverter circuit output voltage uca,ucb,uccWith output current ioa,iob,ioc；
Power computation module：Output voltage and output current for being gathered according to the acquisition module calculate wattful power
Rate P and reactive power Q；
Droop control module：For setting given active-power P*With given reactive power Q*, by given active-power P*、
Given reactive power Q*Subtract each other respectively with active-power P, the reactive power Q being calculated；Given frequency ω is set*It is inverse with giving
Become device output voltage amplitude U*, and calculate angular frequency value ω=ω*+m(P*-P)；Voltage magnitude U=U*+n(Q*-Q)；Wherein m, n
For sagging coefficient, combination obtains combining inverter reference output voltage U sin ω t, U sin (ω t-120 °), U sin (ω t+
120°)；
Voltage loop computing module：For the combining inverter reference output voltage U sin ω for exporting droop control module
T, U sin (ω t-120 °), U sin (ω t+120 °) and the combining inverter output voltage u collectedca,ucb,uccCorresponding phase
Subtract, and obtained difference is modulated through PI controllers, obtain combining inverter and refer to output current iorefa,iorefb,iorefc；
Electric current loop computing module：Combining inverter for Voltage loop computing module to be exported refers to output current iorefa,
iorefb,iorefcWith the combining inverter output current i collectedoa,iob,iocSubtract each other, and by obtained difference through PI controllers
Modulation, obtains the input signal of PWM demodulator, and touching for combining inverter device for power switching is obtained after PWM
Signal.
Compared with prior art, the advantageous effect of present invention is that：Present invention power switch in combining inverter
During device fault, combining inverter topological circuit is reconfigured, i.e., after fault power switching device is cut off, by remaining
Device for power switching and the power supply of DC side reconstitute three-phase inverting circuit, be not required to switching control method, system can be kept
Continuous service, system cost is low, and reliability is high.
Brief description of the drawings
Fig. 1 is the equivalent circuit diagram of high reliability combining inverter；
It is equivalent in normal condition and c phase fault states that Fig. 2 (a), Fig. 2 (b) are that high reliability inverter is separately operable
Circuit diagram；
Fig. 3 is that sagging-voltage-to-current control of high reliability inverter combines the controller chassis of fault-tolerant pulse signal algorithm
Figure.
Fig. 4 is fault-tolerant pulse signal algorithm block diagram
Embodiment
Fig. 1 is the equivalent circuit diagram of high reliability combining inverter, device for power switching V1~V6Form three-phase inversion electricity
Road, DC side are two series direct current power supplys.Tab,Tac,TbcAnd Toa、Tob、TocIt is triac, F1~F6It is
Fuse.These device for power switching, three terminal bidirectional gate-controlled switch and fuse form high reliability combining inverter.The height
The outlet side of reliability inverter circuit is connected to power distribution network by LC wave filters.Inductance L inductance value is 6mH, and electric capacity C capacitance is
1500μF.LC wave filters filter out higher hamonic wave.Three-phase power grid voltage is us{311sin314t,311sin(314t-120°),
311sin (314t+120 °) }, frequency 50Hz.
It is equivalent in normal condition and c phase fault states that Fig. 2 (a), Fig. 2 (b) are that high reliability inverter is separately operable
Circuit diagram.Fig. 2 (a) is circuit structure diagram of the high reliability invertor operation in normal condition.All triode ac switch
Switch Tab,Tac,TbcAnd Toa、Tob、TocAll remain off, all fuse F1~F6All remain up not blown state, structure
Into six Switch Three-Phase type inverter circuits.Fig. 2 (b) is circuit structure diagram of the high reliability invertor operation in c phase fault states,
That is V1Or V4Or both inverter circuit structure chart when breaking down simultaneously.Two power supply compositions of DC voltage value identical are public
Bridge arm altogether, V2And V5、V3And V6Another two bridge arm is formed, is reconstructed into four Switch Three-Phase type inverter circuits.Work as V1When breaking down, melt
Disconnected F1, connect Toc, remaining fuse remains up not blown state, and remaining triac remains off；
Work as V4When breaking down, fuse F4, connect Toc, remaining fuse remains up not blown state, remaining triode ac switch
Switch remains off；Work as V1And V4When breaking down simultaneously, fuse F1And F4, connect Toc, remaining fuse remains up not
Blown state, remaining triac remain off.Other device for power switching break down in inverter
When triac and fuse on off state it is as shown in table 1.
The various on off state tables of table 1
Fig. 3 is high reliability combining inverter control block diagram.Rate-determining steps are as follows：
1) three-phase inverter output voltage u is gatheredc{uca,ucb,uccAnd output current io{ioa,iob,ioc, by following two
Formula calculates active-power P and reactive power Q,
P=ucaioa+ucbiob+uccioc
2) droop control ring is calculated.Given active-power P is set*With given reactive power Q*, by given active-power P*With
Given reactive power Q*Subtract each other respectively with the active-power P and reactive power Q being calculated.Given frequency ω is set*It is inverse with giving
Become device output voltage amplitude U*, then have following two formula
ω=ω*+m(P*-P)
U=U*+n(Q*-Q)
Wherein sagging Coefficient m=0.00005, n=0.00007.The voltage magnitude U and angular frequency value obtained by upper two formula
ω, combination obtain inverter reference output voltage ucref{Usinωt,Usin(ωt-120°),Usin(ωt+120°)}。
3) then calculate Voltage loop.By inverter reference output voltage ucref{Usinωt,Usin(ωt-120°),Usin
(ω t+120 °) } with the inverter output voltage u that collectsc{uca,ucb,uccSubtract each other, obtained difference is modulated through PI controllers
Afterwards, receive inverter and refer to output current io{iorefa,iorefb,iorefc}。
4) last calculating current ring.Inverter is referred into output current io{iorefa,iorefb,iorefcWith with collecting
Inverter output current io{ioa,iob,iocSubtract each other, obtained difference obtains PWM demodulator after the modulation of PI controllers
Input signal, by fault-tolerant pulse signal algorithm, obtain the final trigger signal of combining inverter device for power switching.
Fig. 4 is fault-tolerant pulse signal algorithm block diagram.6 road pulse signal S are produced by PWMv1-Sv6.According to 6 power switch
Device V1-V6Break-make situation, judge whether each road pulse signal needs to change.Algorithm is as follows：
1) 1) V1 and V5 break down simultaneously, by pulse Sv4Value be assigned to Sv5.Then final fault-tolerant pulse signal is exported
Sv1-Sv6。
2) V2 and V4 break down simultaneously, by pulse Sv5Value be assigned to Sv4.Then final fault-tolerant pulse signal is exported
Sv1-Sv6。
3) V2 and V6 break down simultaneously, by pulse Sv2Value be assigned to Sv3.Then final fault-tolerant pulse signal is exported
Sv1-Sv6。
4) V3 and V5 break down simultaneously, by pulse Sv3Value be assigned to Sv2.Then final fault-tolerant pulse signal is exported
Sv1-Sv6。
5) V1 and V6 break down simultaneously, by pulse Sv1Value be assigned to Sv3.Then final fault-tolerant pulse signal is exported
Sv1-Sv6。
6) V3 and V4 break down simultaneously, by pulse Sv3Value be assigned to Sv1.Then final fault-tolerant pulse signal is exported
Sv1-Sv6。
Other failure situations need not change original pulse signal.
Claims (5)
1. a kind of control method of grid-connected inverter, combining inverter includes the tie point of the dc source composition of two series connection,
The tie point is in parallel with grid-connected inverter circuit；Three output ends of the grid-connected inverter circuit respectively connect with a LC wave filter
Connect；Characterized in that, this method comprises the following steps：
1) grid-connected inverter circuit output voltage u is gatheredca,ucb,uccWith output current ioa,iob,ioc, calculated by following two formula
Work(power P and reactive power Q：
P=ucaioa+ucbiob+uccioc；2) given active-power P is set*
With given reactive power Q*, by given active-power P*, given reactive power Q*Active-power P, idle with being calculated respectively
Power Q subtracts each other；Given frequency ω is set*With given inverter output voltage amplitude U*, then have：Angular frequency value ω=ω*+m(P*-
P)；Voltage magnitude U=U*+n(Q*-Q)；Wherein m, n are sagging coefficient；Combination obtains combining inverter reference output voltage U sin
ωt,U sin(ωt-120°),U sin(ωt+120°)；
3) by combining inverter reference output voltage U sin ω t, U sin (ω t-120 °), U sin (ω t+120 °) and collection
The combining inverter output voltage u arrivedca,ucb,uccCorresponding to subtract each other, obtained difference obtains grid-connected inverse after the modulation of PI controllers
Become device and refer to output current iorefa,iorefb,iorefc；
4) combining inverter is referred into output current iorefa,iorefb,iorefcWith the combining inverter output current i collectedoa,
iob,iocSubtract each other, obtained difference obtains the input signal of PWM demodulator, by PWM after the modulation of PI controllers
Afterwards, by fault-tolerant pulse signal algorithm, the final trigger signal of combining inverter device for power switching is obtained.
2. control method of grid-connected inverter according to claim 1, it is characterised in that the fault-tolerant pulse signal algorithm master
The implementation process is wanted to be：6 road pulse signal S are produced by PWMv1-Sv6, according to 6 device for power switching V1-V6Break-make situation, sentence
Whether Duan Ge roads pulse signal needs to change.
3. control method of grid-connected inverter according to claim 2, it is characterised in that whether each road pulse signal needs to change
Become specific judgment rule into：
If V1 and V5 break down simultaneously, by V4 pulse Sv4Value be assigned to V4 pulse Sv5, other pulse signals are constant, then
The final fault-tolerant pulse signal S of outputv1-Sv6；
If V2 and V4 break down simultaneously, by V5 pulse Sv5Value be assigned to V5 pulse Sv4, other pulse signals are constant, then
The final fault-tolerant pulse signal S of outputv1-Sv6；
If V2 and V6 break down simultaneously, by V2 pulse Sv2Value be assigned to V3 pulse Sv3, other pulse signals are constant, then
The final fault-tolerant pulse signal S of outputv1-Sv6；
If V3 and V5 break down simultaneously, by V3 pulse Sv3Value be assigned to V2 pulse Sv2, other pulse signals are constant, then
The final fault-tolerant pulse signal S of outputv1-Sv6；
V1 and V6 break down simultaneously, by V1 pulse Sv1Value be assigned to V3 pulse Sv3, other pulse signals are constant, then defeated
Go out final fault-tolerant pulse signal Sv1-Sv6；
If V3 and V4 break down simultaneously, by V3 pulse Sv3Value be assigned to V1 pulse Sv1, other pulse signals are constant, then
The final fault-tolerant pulse signal S of outputv1-Sv6；
Other failure situations do not change original pulse signal.
4. control method of grid-connected inverter according to claim 1, it is characterised in that m=0.00005, n=0.00007.
A kind of 5. combining inverter control system, it is characterised in that including：
Acquisition module：For gathering grid-connected inverter circuit output voltage uca,ucb,uccWith output current ioa,iob,ioc；
Power computation module：Output voltage and output current for being gathered according to the acquisition module calculate active-power P
And reactive power Q；
Droop control module：For setting given active-power P*With given reactive power Q*, by given active-power P*, it is given
Reactive power Q*Subtract each other respectively with active-power P, the reactive power Q being calculated；Given frequency ω is set*With given inverter
Output voltage amplitude U*, and calculate angular frequency value ω=ω*+m(P*-P)；Voltage magnitude U=U*+n(Q*-Q)；Under wherein m, n be
Hang down coefficient, and combination obtains combining inverter reference output voltage U sin ω t, U sin (ω t-120 °), U sin (ω t+
120°)；
Voltage loop computing module：For combining inverter reference output voltage U sin the ω t, U for exporting droop control module
Sin (ω t-120 °), U sin (ω t+120 °) and the combining inverter output voltage u collectedca,ucb,uccIt is corresponding to subtract each other, and
Obtained difference is modulated through PI controllers, combining inverter is obtained and refers to output current iorefa,iorefb,iorefc；
Electric current loop computing module：Combining inverter for Voltage loop computing module to be exported refers to output current iorefa,iorefb,
iorefcWith the combining inverter output current i collectedoa,iob,iocSubtract each other, and obtained difference is modulated through PI controllers, obtain
To the input signal of PWM demodulator, after PWM, by fault-tolerant pulse signal algorithm, combining inverter work(is obtained
The final trigger signal of rate switching device.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108429283A (en) * | 2018-03-29 | 2018-08-21 | 中南大学 | A kind of microgrid multiple inverter system and its control strategy with fault tolerance |
| CN110768254A (en) * | 2019-11-18 | 2020-02-07 | 广东美的暖通设备有限公司 | Power supply circuit, control method and device of power supply circuit and air conditioner |
| US11437928B2 (en) | 2020-08-19 | 2022-09-06 | Shanghai Maritime University | Adaptively modulated multi-state inverter system and modulating method thereof |
| CN115149884A (en) * | 2022-09-05 | 2022-10-04 | 南京理工大学 | Boost three-phase electric driver and fault-tolerant control method thereof |
| CN117129910A (en) * | 2023-10-27 | 2023-11-28 | 锦浪科技股份有限公司 | Open circuit detection method and system for photovoltaic inverter power device |
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| CN106300431A (en) * | 2016-11-07 | 2017-01-04 | 燕山大学 | A kind of microgrid power droop control method |
| CN106571750A (en) * | 2016-08-05 | 2017-04-19 | 中南大学 | Fault tolerance type tri-leg two-phase orthogonal inverter |
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| CN202384993U (en) * | 2011-12-26 | 2012-08-15 | 天津清源电动车辆有限责任公司 | Three-phase inverter fault-tolerant circuit for electric vehicles |
| CN106571750A (en) * | 2016-08-05 | 2017-04-19 | 中南大学 | Fault tolerance type tri-leg two-phase orthogonal inverter |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108429283A (en) * | 2018-03-29 | 2018-08-21 | 中南大学 | A kind of microgrid multiple inverter system and its control strategy with fault tolerance |
| CN110768254A (en) * | 2019-11-18 | 2020-02-07 | 广东美的暖通设备有限公司 | Power supply circuit, control method and device of power supply circuit and air conditioner |
| CN110768254B (en) * | 2019-11-18 | 2022-02-22 | 广东美的暖通设备有限公司 | Power supply circuit, control method and device of power supply circuit and air conditioner |
| US11437928B2 (en) | 2020-08-19 | 2022-09-06 | Shanghai Maritime University | Adaptively modulated multi-state inverter system and modulating method thereof |
| CN115149884A (en) * | 2022-09-05 | 2022-10-04 | 南京理工大学 | Boost three-phase electric driver and fault-tolerant control method thereof |
| CN115149884B (en) * | 2022-09-05 | 2022-11-18 | 南京理工大学 | Boost three-phase electric driver and fault-tolerant control method thereof |
| CN117129910A (en) * | 2023-10-27 | 2023-11-28 | 锦浪科技股份有限公司 | Open circuit detection method and system for photovoltaic inverter power device |
| CN117129910B (en) * | 2023-10-27 | 2024-02-06 | 锦浪科技股份有限公司 | Open circuit detection method and system for photovoltaic inverter power device |
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