CN105226724B - A kind of three-phase converter devices and methods therefor based on virtual output impedance - Google Patents
A kind of three-phase converter devices and methods therefor based on virtual output impedance Download PDFInfo
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Abstract
The invention discloses a kind of three-phase converter devices and methods therefor based on virtual output impedance, it is characterized in that, including three-phase inverter main circuit, for grid-connected switch, power network module, current measurement module；Also include the virtual active power of output to calculate module, export virtual reactive power calculating module, modulated signal computing module, modulation module, frequency active power droop control adjustment module, voltage and reactive power droop control adjustment module, power conversion computing module, inverter output voltage phase and grid phase synchronous adjustment module, output virtual voltage phase calculation module, output virtual voltage amplitude computing module and virtual voltage synthesis module.The beneficial effect that the present invention is reached：The present invention realizes separate unit and many inverter parallel systems operate in grid-connect mode, off-network pattern, and can realize off-network, the seamless handover function of grid-connected both of which, it is ensured that inverter system safe and reliable operation.
Description
Technical field
The present invention relates to a kind of three-phase converter devices and methods therefor, and in particular to one kind is based on virtual output impedance
Three-phase converter devices and methods therefor.
Background technology
With becoming increasingly conspicuous for the energy crisis in global range and environmental problem, distributed generation technology and micro-capacitance sensor skill
Art is got growing concern for, and is used as distributed resource and the tie of power distribution network (micro-capacitance sensor), the function quilt of combining inverter
Deeply excavate and affirmed its beneficial effect, but still conventional control strategy can not be ignored in itself to power distribution network and micro-capacitance sensor safety
The challenge that stable operation is brought.Especially conventional combining inverter fast response time, be difficult to participate in power network regulation, it is impossible to be containing point
The active distribution network of cloth power supply provides necessary voltage and frequency support, can not more be carried for the relatively poor micro-capacitance sensor of stability
For necessary damping action, lack a kind of mechanism with power distribution network and micro-capacitance sensor effective " synchronous ".
The content of the invention
To solve the deficiencies in the prior art, it is an object of the invention to provide a kind of three contraries based on virtual output impedance
Become device control device and its method, realize that separate unit and many inverter parallel systems operate in grid-connect mode, off-network pattern, and
Off-network, the seamless handover function of grid-connected both of which can be achieved, it is ensured that inverter system safe and reliable operation.
In order to realize above-mentioned target, the present invention is adopted the following technical scheme that：
A kind of three-phase converter device based on virtual output impedance, it is characterized in that, including the main electricity of three-phase inverter
Road, be arranged on three-phase inverter main circuit be used for grid-connected switch, power network module, current measurement module；Also include defeated
Go out virtual active power to calculate module, export virtual reactive power calculating module, modulated signal computing module, modulation module, frequency
Rate-active power droop control adjustment module, voltage-reactive power droop control adjustment module, power conversion computing module, inverse
Become device output voltage phase and be adjusted in synchronism module, output virtual voltage phase calculation module, output virtual voltage with grid phase
Amplitude computing module and virtual voltage synthesis module；
The output end of the current measurement module and virtual voltage synthesis module is all connected with exporting virtual active power calculating
Module, the virtual reactive power of output calculate module and modulated signal computing module；
The output end of the modulated signal computing module is connected with modulation module；
The virtual active power of output calculates module and the output end of frequency-active power droop control adjustment module connects
Connect the input that power changes computing module；
The virtual reactive power of output calculates module and the output end of voltage-reactive power droop control adjustment module connects
Connect another input that power changes computing module；
An output end and inverter output voltage phase and the same step of grid phase for the power conversion computing module
Save the output end connection output virtual voltage phase calculation module of module；
Another output end connection output virtual voltage amplitude computing module of the power conversion computing module；
The output end connection of the output virtual voltage phase calculation module and output virtual voltage amplitude computing module is empty
Intend voltage synthesis module；
The modulated signal computing module is used to produce inverter modulated signal；
The modulation module is used to produce driving power switch controlling signal, the output end and three-phase inverter of modulation module
Main circuit is connected.
A kind of control method based on the foregoing three-phase converter device based on virtual output impedance, it is characterized in that,
Comprise the following steps：
1) the three-phase inverter output inductor electric current i that will be obtained by samplingLabcWith the production of virtual voltage synthesis module
Raw inverter virtual output voltage vrabcThe virtual active power of feeding output calculates module and exports virtual reactive power and calculates
Module, calculates and obtains the corresponding virtual active power of output p of inverteroWith reactive power qo；
2) frequency-active power droop control adjustment module and voltage-reactive power droop control adjustment module point are passed through
Huo get not inverter active power command value PrefWith reactive power command value Qref, by the virtual active power of output p of inverteroWith
Reactive power qoRespectively with corresponding active power command value PrefWith reactive power command value QrefBe compared, and will relatively after
Value feeding power conversion computing module；
3) inverter output voltage phase and grid phase are adjusted in synchronism into module output signal Δ P to calculate with power conversion
The active power output signal P ' additions feeding output virtual voltage phase calculation module of module, calculates acquisition inverter virtually defeated
Go out the phase theta of voltage, the reactive power output signal Q ' feedings that power is changed into computing module export virtual voltage amplitude and calculated
Module, obtains the amplitude V of inverter virtual output voltage；
4) phase theta of virtual output voltage and amplitude V are sent into virtual voltage synthesis module generation inverter virtually to export
Voltage vrabc, by inverter inductance current iLabcWith inverter virtual output voltage vrabcModulated signal computing module is sent into, is obtained
Inverter modulated signal vm；
5) by modulated signal vmWith carrier signal vcModulation module is together sent into, modulation module produces control inverter power
The control signal D of switch.
The beneficial effect that the present invention is reached：The present invention realizes that separate unit and many inverter parallel systems operate in grid-connected mould
Formula, off-network pattern, and off-network, the seamless handover function of grid-connected both of which can be realized, it is ensured that inverter system is safe and reliable
Operation.
Brief description of the drawings
Fig. 1 is the overall structure control block diagram of the present invention；
Fig. 2 is that the present invention operates in grid-connect mode, off-network pattern, off-network to grid-connect mode switching three for single inverter
Plant the simulation result schematic diagram under operating mode；
Fig. 3 is that the present invention operates in grid-connect mode, off-network pattern, off-network to grid-connected mould for two inverter parallel systems
Formula switches the simulation result schematic diagram under three kinds of operating modes.
The implication of reference in figure：
1- three-phase inverter main circuits, 2- is used for grid-connected switch S and power network module, and 3- exports virtual active power and calculated
Module, 4- exports virtual reactive power and calculates module, 5- frequencies-active power droop control adjustment module, 6- voltages-idle work(
Rate droop control adjustment module, 7- power conversion computing module, 8- inverter output voltages phase is adjusted in synchronism with grid phase
Module, 9- output virtual voltage phase calculation modules, 10- output virtual voltage amplitude computing modules, 11- virtual voltages synthesis mould
Block, 12- modulated signal computing modules, 13- modulation modules.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
The annexation of the present apparatus is as shown in Figure 1.
In use, comprising the following steps：
1) the three-phase inverter output inductor electric current i that will be obtained by samplingLabcWith virtual voltage synthesis module 11
The inverter virtual output voltage v of generationrabcThe virtual active power of feeding output calculates module 3 and exports virtual wattless power meter
Module 4 is calculated, calculates and obtains the corresponding virtual active power of output p of inverteroWith reactive power qo。
It is p to export virtual active power and calculate the calculation formula of module 3o=vra·iLa+vrb·iLb+vrc·iLc(1), formula
Middle vra、vrb、vrcInverter three-phase virtual output voltage is represented respectively；iLa、iLb、iLcThe output filtering of inverter three-phase is represented respectively
Inductive current.
It is q to export virtual reactive power and calculate the calculation formula of module 4o=vra·(-j)·iLa+vrb·(-j)·iLb+
vrc·(-j)·iLc(2), v in formulara、vrb、vrcInverter three-phase virtual output voltage is represented respectively；iLa、iLb、iLcRespectively
Represent inverter three-phase output inductor electric current.
2) frequency-active power droop control adjustment module 5 and voltage-reactive power droop control adjustment module 6 are passed through
Inverter active power command value P is obtained respectivelyrefWith reactive power command value Qref, by the virtual active power of output p of invertero
With reactive power qoRespectively with corresponding active power command value PrefWith reactive power command value QrefIt is compared, and will compares
Value feeding power conversion computing module 7 afterwards.
Frequency-calculation formula of active power droop control adjustment module 5 is Pref=(f*-f)·kf(3), in formula, f*For
Corresponding peak frequency in inverter frequency-active sagging curve, f is that inverter exports actual frequency, kfFor frequency-active
Sagging coefficient.
Voltage-calculation formula of reactive power droop control adjustment module 6 is Qref=(V*-V)·kv(4), V in formula*For
Corresponding maximum voltage in contravarianter voltage-idle sagging curve, V is that inverter exports virtual voltage, kvFor voltage-idle
Sagging coefficient.
3) inverter output voltage phase and grid phase are adjusted in synchronism into the output signal Δ P of module 8 to count with power conversion
The active power output signal P ' additions feeding output virtual voltage phase calculation module 9 of module 7 is calculated, acquisition inverter is calculated empty
Intend the phase theta of output voltage, the reactive power output signal Q ' feedings that power is changed into computing module 7 export virtual voltage amplitude
Computing module 10, obtains the amplitude V of inverter virtual output voltage.
Power changes the calculation formula of computing module 7：Formula
Middle Z=R+jX, wherein R are the virtual output impedance of inverter, and X=ω L are inverter filtering inductance induction reactance.
Inverter output voltage phase is adjusted in synchronism the calculation formula of module 8 with grid phase：E in formulagAnd voRespectively line voltage and inverter reality output
Voltage,For phase adjustment coefficient, ωcFor low pass filter corner frequency.
4) phase theta of virtual output voltage and amplitude V are sent into virtual voltage synthesis module 11 to generate inverter virtually defeated
Go out voltage vrabc, by inverter inductance current iLabcWith inverter virtual output voltage vrabcModulated signal computing module 12 is sent into,
Obtain inverter modulated signal vm。
Exporting the calculation formula of virtual voltage phase calculation module 9 isFormula
Middle P*=P '+Δ P, kω、kpRespectively angular frequency adjustment factor and active adjustment coefficient, ω0For electrical network angular frequency.
Exporting the calculation formula of virtual voltage amplitude computing module 10 isK in formulaqTo be idle
Adjustment factor.
The calculation formula of virtual voltage synthesis module 11 is
The calculation formula of modulated signal computing module 12 is vm=vrabc-iLabcR is load resistance in R (10), formula.
5) by modulated signal vmWith carrier signal vcModulation module is together sent into, modulation module produces control inverter power
The control signal D of switch.
Correctness and feasibility to illustrate the invention, the three-phase inverter control based on virtual output impedance to being proposed
Method processed has carried out emulation experiment checking, wherein emulation is divided into single inverter operation and four inverter parallels, two kinds of feelings
Condition.Simulation parameter is：Line voltage phase voltage amplitude 257V, input direct voltage 800V, output inductor 0.15mH, filtering
Electric capacity 600uF, rated output power is respectively 100kW and 50kW, and load resistance R is 0.2 Ω.
(1) when single inverter is run：
When Fig. 2 is that inverter off-network pattern mutually switches with grid-connect mode, power network current igaWith inverter output current ioaRipple
The simulation waveform of shape, wherein in t=0.8s moment inverter by off-network pattern switching to grid-connect mode, it is inverse at the t=1.2s moment
Become device and off-network pattern is switched back into by grid-connect mode again.
The simulation waveform that Fig. 2 is provided shows that under the control method based on the present invention, single inverter is fine to be realized
Stable operation under grid-connect mode, off-network pattern, while realizing seamless switching between off-network pattern and grid-connect mode, switches
Current over pulse phenomenon does not occur for moment.
During (2) two inverter parallels：
Fig. 3 be two inverter parallels when off-network pattern mutually switches with grid-connect mode, power network current igaWith two
Inverter output current ioa1、ioa2Simulation waveform, wherein in t=0.8s moment inverter parallel system by off-network pattern switching
To grid-connect mode, off-network pattern is switched back into by grid-connect mode again in t=1.2s moment inverter parallel system.
The simulation waveform that Fig. 3 is provided is shown, same during two inverter parallels under the control method based on the present invention
It is fine to realize the stable operation under grid-connect mode, off-network pattern, while real between off-network pattern and grid-connect mode
Seamless switching is showed.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these improve and deformed
Also it should be regarded as protection scope of the present invention.
Claims (1)
1. a kind of control method of the three-phase converter device based on virtual output impedance, it is characterized in that, it is described virtual defeated
Going out the three-phase converter device of impedance includes three-phase inverter main circuit, the use being arranged on three-phase inverter main circuit
In grid-connected switch, power network module, current measurement module；Also include exporting virtual active power calculating module, export virtual nothing
Work(power computation module, modulated signal computing module, modulation module, frequency-active power droop control adjustment module, voltage-
Reactive power droop control adjustment module, power conversion computing module, inverter output voltage phase and the same step of grid phase
Save module, output virtual voltage phase calculation module, output virtual voltage amplitude computing module and virtual voltage synthesis module；
The output end of the current measurement module and virtual voltage synthesis module be all connected with exporting virtual active power calculate module,
Export virtual reactive power and calculate module and modulated signal computing module；
The output end of the modulated signal computing module is connected with modulation module；
The virtual active power of output calculates the output end connection work(of module and frequency-active power droop control adjustment module
Rate changes an input of computing module；
The virtual reactive power of output calculates the output end connection work(of module and voltage-reactive power droop control adjustment module
Rate changes another input of computing module；
An output end and inverter output voltage phase for the power conversion computing module is adjusted in synchronism mould with grid phase
The output end connection output virtual voltage phase calculation module of block；
Another output end connection output virtual voltage amplitude computing module of the power conversion computing module；
The virtual electricity of the output end connection of the output virtual voltage phase calculation module and output virtual voltage amplitude computing module
It is pressed into module；
The modulated signal computing module is used to produce inverter modulated signal；
The modulation module is used to produce driving power switch controlling signal, output end and the main electricity of three-phase inverter of modulation module
Road is connected；
Control method comprises the following steps：
1) the three-phase inverter output inductor electric current i that will be obtained by samplingLabcWith virtual voltage synthesis module produce it is inverse
Become device virtual output voltage vrabcThe virtual active power of feeding output, which calculates module and exports virtual reactive power, calculates module, meter
Calculate and obtain the corresponding virtual active power of output p of inverteroWith reactive power qo；
2) obtained respectively by frequency-active power droop control adjustment module and voltage-reactive power droop control adjustment module
Obtain inverter active power command value PrefWith reactive power command value Qref, by the virtual active power of output p of inverteroWith it is idle
Power qoRespectively with corresponding active power command value PrefWith reactive power command value QrefIt is compared, and by the value after comparing
Send into power conversion computing module；
3) inverter output voltage phase and grid phase are adjusted in synchronism module output signal Δ P and power conversion computing module
Active power output signal P ' additions feeding output virtual voltage phase calculation module, calculate obtain inverter virtually export electricity
The phase theta of pressure, the reactive power output signal Q ' feedings that power is changed into computing module export virtual voltage amplitude computing module,
Obtain the amplitude V of inverter virtual output voltage；
4) phase theta of virtual output voltage and amplitude V are sent into virtual voltage synthesis module and generates inverter virtual output voltage
vrabc, by inverter inductance current iLabcWith inverter virtual output voltage vrabcModulated signal computing module is sent into, inversion is obtained
Device modulated signal vm；
5) by modulated signal vmWith carrier signal vcModulation module is together sent into, modulation module produces control inverter power switch
Control signal D.
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| CN110148966B (en) * | 2019-05-28 | 2023-04-28 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Parallel double-inverter-based parallel/off-grid control method and device |
| CN111509788B (en) * | 2020-04-26 | 2022-08-09 | 太原理工大学 | Improved alternating current-direct current hybrid micro-grid with variable topology and control method thereof |
| CN112104252B (en) * | 2020-09-08 | 2021-08-20 | 中车青岛四方车辆研究所有限公司 | Method and device for calculating power of auxiliary converter of motor train unit |
| CN114374206B (en) * | 2022-03-22 | 2022-06-17 | 西安热工研究院有限公司 | Grid-connected point voltage adjusting method and system of fused salt energy storage and conversion device for thermal power |
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