CN108173288A - Inhibit the voltage-type impedance adapter control method of multi-inverter grid-connected system resonance - Google Patents
Inhibit the voltage-type impedance adapter control method of multi-inverter grid-connected system resonance Download PDFInfo
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- H02J3/382—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The present invention provides a kind of voltage-type impedance adapter control methods for inhibiting multi-inverter grid-connected system resonance.Control method of the present invention includes：Voltage and current sample is carried out to voltage-type impedance adapter；Voltage-type impedance adapter is achieved in that the virtual harmonic impedance of setting obtains virtual harmonic voltage instruction value, obtains PWM modulation wave by voltage controller, realizes the no error following to command value.The control method of voltage-type impedance adapter proposed by the invention by realizing virtual harmonic impedance function, is remolded and is adapted to the impedance of multi-inverter grid-connected system, very effective suppression system resonance and Harmonics amplification.The voltage-type impedance adapter is easier to fictionalize smaller harmonic impedance, very good for the resonance inhibition under harmonic current source forcing, and notable to the absorption function of multi-inverter grid-connected system harmonic wave.Therefore with apparent superiority.
Description
Technical field
The present invention relates to a kind of control method of the voltage-type impedance adapter of inhibition multi-inverter grid-connected system resonance, electricity
Die mould impedance adapter is remolded and is adapted to grid-connected point impedance by the realization of virtual harmonic impedance, can be to multi-inverter simultaneously
Resonance and harmonic wave in net system are effectively inhibited.
Background technology
The regenerative resource grid-connected system using photovoltaic and wind-powered electricity generation as representative has obtained quick development in recent years.But
The equivalent power grid that the distributed constant that can not ignore in transformer, long distance transmission line in multi-inverter grid-connected system is formed
Impedance may cause inverter to damp strategy fails, so as to excite the resonance between multi-inverter grid-connected system and power grid.
In addition, multi-inverter grid-connected system is often in weak power grid environment, electric network impedance amplitude changes greatly, and making to generate electricity by way of merging two or more grid systems is
There are resonance problems of the very strong coupling so as to cause system in system between inverter and electric network impedance.Multi-inverter generates electricity by way of merging two or more grid systems
The harmonic wave of system is become more complicated due to the presence of numerous shunt choppers, and harmonic characteristic will be by past low frequency, spy
Determine the characteristics of subharmonic is main and be gradually rendered as wideband characteristic of field, it is easier to evoke the harmonic wave concussion in system, harmonic wave is caused to put
Greatly, lead to system instability problem.Therefore explore more effective form and method come from the overall situation to multi-inverter grid-connected hair
The resonance of electric system is inhibited.And impedance adapter is by being remolded and being adapted to system impedance from system-level angle
Resonance, harmonic wave are inhibited.
At present, have more domestic and international scientific papers to be analyzed and propose solution, such as：
Document 1《Li F,Zhang X,Zhu H,et al.Harmonic reduction through resistive
and inductive harmonic impedance[C].Electrical Machines and Systems(ICEMS),
2014 17thInternational Conference on.IEEE,2014:1385-1388.》(《It is humorous by resistance and inductance
Wave impedance reduces harmonic wave》--- the 17th international conference collection of thesis of IEEE in 2014)；
Document 2《Improve impedance adjusting method of the LCL type gird-connected inverter to electric network impedance robustness》(Chinese electrical engineering
Journal, 2015,35,179-204.)；
Document 3《Liu Cong, Dai Ke, a tree congruence parallel connection type APF compensating voltage source type nonlinear load time-harmonic wave electric currents are put
Research [J] Proceedings of the CSEEs of big effect, 2011,31 (27)：21-28》；
Document 4《Wang X,Blaabjerg F,Liserre M.An active damper to suppress
multiple resonances with unknown frequencies[J].IEEE Press,2014:2184-2191.》
(《Impedance adapter inhibits the resonance of multiple unknown frequencies》--- IEEE published articles collection in 2014)；
Document 5《Wang X,Blaabjerg F,Liserre M,et al.An active damper for
stabilizing powerelectronics-based AC systems[J].Power Electronics,IEEE
Transactions on,2014,29(7):3318-3329.》(《For stablizing the impedance adapter of AC electric power systems》——
IEEE power electronics periodical in 2014)；
Document 6《Wang X,Pang Y,Loh P C,et al.A Series-LC-Filtered Active Damper
with Grid Disturbance Rejection for AC Power-Electronic-Based Power Systems
[J].IEEE Transactions on Power Electronics,2015,30(8):4037-4041.》(《Based on alternating current
Force system has the series LC filtering impedance adapter of power grid Immunity Performance》--- IEEE power electronics periodical in 2014)；
Document 1 proposes a kind of new resistance and inductance series connection harmonic impedance, compared to resistance harmonic impedance, this method
Harmonic inhibition capability is stronger.Document 2 proposes a kind of electric network impedance adjusting method in point of common coupling parallel connection RC branches, the party
Method can be ensured that gird-connected inverter adapts to the variation of electric network impedance wide scope, make the defeated of the electric network impedance after adjustment and gird-connected inverter
Go out impedance and meet the stability criteria based on impedance always.The Active Power Filter-APF that document 3 proposes is that one kind is used to dynamically press down
The novel electric power electric device of harmonic wave processed, compensating reactive power, it can carry out the harmonic wave of different amplitudes and frequency quick tracking and mend
It repays.Document 4 proposes the resonance for inhibiting multiple frequencies unknown using impedance adapter.Document 5 comparative analysis impedance adapter
Two kinds of control programs, simplify the control process to resistance value at resonant frequency using direct resonance potential compensation method.Text
6 propositions are offered using impedance adapter is realized with the small-power inverter of LC series filters, increase the electricity of series filter
Capacitance helps to bear most of system voltage, therefore reduces the DC voltage needed for impedance adapter.
Pass through the research to document above, it is believed that the prior art there is problems：
(1) above-mentioned proposed current mode impedance adapter, due to the limitation of its own stability, in weak grid condition
Under, current mode impedance adapter is difficult to realize smaller virtual harmonic impedance, so it has grid-connected system resonance rejection ability
Limit.
(2) impedance adapter of the studies above is only limitted to current mode pattern, does not account for the impedance adapter of other forms
To the resonance and harmonic suppression effect of multi-inverter grid-connected system.
Invention content
The purpose of the present invention is that system caused by order to solve resonance and harmonic wave in multi-inverter grid-connected system is unstable
Problem carries out virtual harmonic impedance using voltage-type impedance adapter and grid-connected point impedance is remolded and is adapted to, realizes to more
Resonance and harmonic wave in grid-connected inverters system are effectively inhibited.Specifically, inhibit more inversions the present invention provides a kind of
The voltage-type impedance adapter control method of device grid-connected system resonance.Used technical solution is：With traditional parallel connection
Current mode impedance adapter compare, voltage-type impedance adapter is connected in parallel at point of common coupling.Voltage-type impedance adapter is adopted
With voltage source type converter pattern can virtual very little harmonic impedance, the remodeling to electric network impedance and adaptation are realized, to inhibit
The resonance and Harmonics amplification of multi-inverter grid-connected system.
The object of the present invention is achieved like this.
The present invention provides a kind of voltage-type impedance adapter control method for inhibiting multi-inverter grid-connected system resonance, sheets
Control method realizes the virtual of harmonic impedance by voltage-type impedance adapter, so as to complete the weight to grid entry point electric network impedance
Modeling, to inhibit the resonance of multi-inverter grid-connected system and harmonic wave, is as follows：
Step 1, real-time sampling voltage-type impedance adapter output current iV, the output of real-time sampling voltage-type impedance adapter
Voltage is UC_V；
Step 2, the voltage-type impedance adapter output current i obtained according to step 1 real-time samplingVFiltered device obtains electricity
Die mould impedance adapter output harmonic wave electric current iVh, the voltage-type impedance adapter output voltage that is obtained according to step 1 real-time sampling
UC_VFiltered device obtains voltage-type impedance adapter output harmonic wave voltage UC_Vh；
Step 3, according to voltage-type impedance adapter output harmonic wave electric current i obtained in step 2Vh, voltage is calculated
The virtual harmonic voltage instruction value of type impedance adapterIts calculation formula is as follows：
Wherein, ZAD_VIt is the virtual harmonic impedance value of voltage-type impedance adapter；
Step 4, by the virtual harmonic voltage instruction value of the obtained voltage-type impedance adapter of step 3With step
2 obtained voltage-type impedance adapter output harmonic wave voltage UC_VhThe result subtracted each other is set as voltage error △ U* AD_V, △ U* AD_V
=U* AD_V-UC_Vh；
Step 5, by the obtained voltage error of step 4The realization pair of PWM modulation wave is exported by voltage controller
The no error following of voltage instruction value；
Step 6, return to step 1, into next cycle.
Preferably, the voltage-type impedance adapter, which is characterized in that the voltage-type impedance adapter is by one
Converters are formed, and voltage-type impedance adapter is connected in parallel at the point of common coupling of multi-inverter grid-connected system.
Relative to the prior art, beneficial effects of the present invention are as follows：
1) the virtual harmonic impedance of very little can be fictionalized in grid entry point using voltage-type impedance adapter, is realized to grid-connected
The remodeling of point impedance and adaptation, to inhibit the resonance of grid entry point and Harmonics amplification；
2) in light current net, Opposed Current type impedance adapter, the virtual harmonic impedance of voltage-type impedance adapter
Function is easier to realize.In the case of parallel connection, the smaller resonance inhibition to system grid connection point of virtual impedance is better.
As soon as 3) voltage-type impedance adapter is made of a voltage source type electric power electronic converter in itself, so its own
The impedance of a very little is equivalent to, there is good absorption function to the harmonic wave of multi-inverter grid-connected system；
Description of the drawings
Fig. 1 is the topology diagram of voltage-type impedance adapter in the embodiment of the present invention；
Fig. 2 is that control method described in this specification realizes flow chart；
Fig. 3 is the phase voltage waveform figure of multi-inverter grid-connected system resonance；
Fig. 4 is the THD analyses of the phase voltage of multi-inverter grid-connected system resonance；
Fig. 5 is the phase voltage waveform figure that voltage-type impedance adapter inhibits multi-inverter grid-connected system resonance；
Fig. 6 is that voltage-type impedance adapter analyzes the THD of phase voltage that multi-inverter grid-connected system resonance inhibits；
Specific embodiment
This example is with two gird-connected inverters and voltage-type impedance in a software Matlab/Simulink
For the system that device is formed, a kind of voltage-type impedance adapter control method for inhibiting multi-inverter grid-connected system resonance is illustrated.
The step of the present embodiment, is as follows.
Fig. 1 is the topology diagram of the voltage-type impedance adapter in the embodiment of the present invention.It may be seen that the electricity
Die mould impedance adapter is made of a converters, is connected in parallel on the point of common coupling of grid-connected system, institute
The voltage-type impedance adapter stated includes DC bus capacitor C, three phase full bridge and LVCVFilter circuit, the DC bus capacitor C, three
Phase full-bridge and filter circuit LVCVIt is linked in sequence successively；
Specifically, build voltage-type proposed by the invention according to Fig. 1 in software Matlab/Simulink first
The topological structure of impedance adapter.It is multi-inverter described in Fig. 1 to be replaced to generate electricity by way of merging two or more grid systems using two 10KW gird-connected inverters
System realizes voltage-type impedance adapter using 10KW voltage source type converters.Gird-connected inverter switching frequency fwi=4000HZ, base
Wave frequency rate foi=50HZ, DC voltage Udc=850V uses LC mode filters, bridge arm side inductance L1=L2=3mH,
Filter capacitor is C1=C2=40uF.Voltage-type impedance adapter switching frequency fw=16000Hz, fundamental frequency fo=50Hz, makes
With LC mode filters, bridge arm side inductance is LV=0.9mH, filter capacitor CV=12.3uF.Voltage-type impedance adapter is straight
Connect the point of common coupling being connected in parallel in grid-connected system model emulation.The virtual harmonic impedance Z of voltage-type impedance adapterAD_V=3
Ω.The virtual value of net side line voltage is Ug=380V, electric network impedance Zg=0.9mH.
Fig. 2 is a kind of voltage-type impedance adapter controlling party for inhibiting multi-inverter grid-connected system resonance proposed by the present invention
The realization flow chart of method, it may be seen that this control method realizes the virtual of harmonic impedance by voltage-type impedance adapter,
So as to complete the remodeling to grid entry point electric network impedance, to inhibit the resonance of multi-inverter grid-connected system and harmonic wave, specific steps are such as
Under：
Step 1, real-time sampling voltage-type impedance adapter output current iV, the output of real-time sampling voltage-type impedance adapter
Voltage is UC_V；
Step 2, the voltage-type impedance adapter output current i obtained according to step 1 real-time samplingVFiltered device obtains electricity
Die mould impedance adapter output harmonic wave electric current iVh, the voltage-type impedance adapter output voltage that is obtained according to step 1 real-time sampling
UC_VFiltered device obtains voltage-type impedance adapter output harmonic wave voltage UC_Vh；
Step 3, according to voltage-type impedance adapter output harmonic wave electric current i obtained in step 2Vh, voltage is calculated
The virtual harmonic voltage instruction value of type impedance adapterIts calculation formula is as follows：
Wherein, ZAD_VIt is the virtual harmonic impedance value of voltage-type impedance adapter；ZAD_VFor setting value, in the present embodiment,
ZAD_V=3 Ω.
Step 4, by the virtual harmonic voltage instruction value of the obtained voltage-type impedance adapter of step 3With step
2 obtained voltage-type impedance adapter output harmonic wave voltage UC_VhThe result subtracted each other is set as voltage error
Step 5, by the obtained voltage error of step 4The realization pair of PWM modulation wave is exported by voltage controller
The no error following of voltage instruction value；
Step 6, return to step 1, into next cycle.
Fig. 3 is the phase voltage waveform figure of multi-inverter grid-connected system resonance；Fig. 4 is multi-inverter grid-connected system
The THD analyses of the phase voltage of resonance, the wherein fundamental voltage amplitude of phase voltage are 232.2V, THD=50.94%；Fig. 5 is voltage-type resistance
The phase voltage waveform figure that anti-adapter inhibits multi-inverter grid-connected system resonance；Fig. 6 is voltage-type impedance adapter pair
The THD analyses for the phase voltage that multi-inverter grid-connected system resonance inhibits, the wherein fundamental voltage amplitude of phase voltage are 232.2V,
THD=0.48%.I.e. in the case where resonance occurs for multi-inverter grid-connected system, in identical parameter and simulated conditions
Under, it, can to the difference of photovoltaic parallel in system resonance inhibition in the case of forward and backward two kinds of voltage-type impedance adapter switching of observation
To find voltage-type impedance adapter to the inhibition of grid-connected photovoltaic system resonance clearly, it was demonstrated that institute of the present invention
Put forward the validity that the control of voltage-type impedance adapter is realized.
In conclusion voltage-type impedance adapter can show superior resonance and harmonic inhibition capability, have certain
Feasibility.
Claims (2)
- A kind of 1. voltage-type impedance adapter control method for inhibiting multi-inverter grid-connected system resonance, which is characterized in that this control Method processed realizes the virtual of harmonic impedance by voltage-type impedance adapter, so as to complete the weight to grid entry point electric network impedance Modeling inhibits the resonance and harmonic wave of multi-inverter grid-connected system, is as follows：Step 1, real-time sampling voltage-type impedance adapter output current iV, real-time sampling voltage-type impedance adapter output voltage For UC_V；Step 2, the voltage-type impedance adapter output current i obtained according to step 1 real-time samplingVFiltered device obtains voltage-type Impedance adapter output harmonic wave electric current iVh, the voltage-type impedance adapter output voltage U that is obtained according to step 1 real-time samplingC_VThrough Wave filter obtains voltage-type impedance adapter output harmonic wave voltage UC_Vh；Step 3, according to voltage-type impedance adapter output harmonic wave electric current i obtained in step 2Vh, voltage-type resistance is calculated The virtual harmonic voltage instruction value of anti-adapterIts calculation formula is as follows：Wherein, ZAD_VIt is the virtual harmonic impedance value of voltage-type impedance adapter；Step 4, by the virtual harmonic voltage instruction value of the obtained voltage-type impedance adapter of step 3It is obtained with step 2 Voltage-type impedance adapter output harmonic wave voltage UC_VhThe result subtracted each other is set as voltage errorStep 5, by the obtained voltage error of step 4PWM modulation wave is exported by voltage controller to realize to voltage The no error following of command value；Step 6, return to step 1, into next cycle.
- 2. it is controlled according to a kind of voltage-type impedance adapter of inhibition multi-inverter grid-connected system resonance described in claim 1 Method, which is characterized in that the voltage-type impedance adapter is made of a converters, voltage-type impedance Device is connected in parallel at the point of common coupling of multi-inverter grid-connected system.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109167385A (en) * | 2018-08-31 | 2019-01-08 | 合肥工业大学 | The control method of compound impedance adapter system |
| CN109638894A (en) * | 2019-01-31 | 2019-04-16 | 张欣 | A kind of series connection adaptive stabilizer between gird-connected inverter and weak grid |
| CN110138246A (en) * | 2019-05-30 | 2019-08-16 | 东北电力大学 | Impedance remodeling procedure based on three level Dual-Buck type circuits |
| CN110912182A (en) * | 2019-10-21 | 2020-03-24 | 合肥工业大学 | Design method of virtual resistance parameters of parallel impedance adapter |
| CN111682578A (en) * | 2020-05-09 | 2020-09-18 | 杭州电子科技大学 | Three-phase harmonic resonance suppression device and suppression method |
| CN111682579A (en) * | 2020-05-09 | 2020-09-18 | 杭州电子科技大学 | Single-phase harmonic resonance optimization suppression device and suppression method |
| CN112271750A (en) * | 2020-10-13 | 2021-01-26 | 上海海事大学 | Method for identifying internal unstable inverter in multi-parallel inverter system |
| WO2022233079A1 (en) * | 2021-05-07 | 2022-11-10 | 南方电网科学研究院有限责任公司 | Parameter design method for series-type passive impedance apadter suitable for flexible direct current |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109167385A (en) * | 2018-08-31 | 2019-01-08 | 合肥工业大学 | The control method of compound impedance adapter system |
| CN109638894A (en) * | 2019-01-31 | 2019-04-16 | 张欣 | A kind of series connection adaptive stabilizer between gird-connected inverter and weak grid |
| CN110138246A (en) * | 2019-05-30 | 2019-08-16 | 东北电力大学 | Impedance remodeling procedure based on three level Dual-Buck type circuits |
| CN110138246B (en) * | 2019-05-30 | 2020-11-13 | 东北电力大学 | Impedance remodeling method based on three-level Dual-Buck circuit |
| CN110912182A (en) * | 2019-10-21 | 2020-03-24 | 合肥工业大学 | Design method of virtual resistance parameters of parallel impedance adapter |
| CN110912182B (en) * | 2019-10-21 | 2022-10-04 | 合肥工业大学 | Design method of virtual resistance parameters of parallel impedance adapter |
| CN111682578A (en) * | 2020-05-09 | 2020-09-18 | 杭州电子科技大学 | Three-phase harmonic resonance suppression device and suppression method |
| CN111682579A (en) * | 2020-05-09 | 2020-09-18 | 杭州电子科技大学 | Single-phase harmonic resonance optimization suppression device and suppression method |
| CN111682578B (en) * | 2020-05-09 | 2022-02-18 | 杭州电子科技大学 | Three-phase harmonic resonance suppression device and suppression method |
| CN112271750A (en) * | 2020-10-13 | 2021-01-26 | 上海海事大学 | Method for identifying internal unstable inverter in multi-parallel inverter system |
| WO2022233079A1 (en) * | 2021-05-07 | 2022-11-10 | 南方电网科学研究院有限责任公司 | Parameter design method for series-type passive impedance apadter suitable for flexible direct current |
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