The Resonance Suppression for Parallel Photovoltaic Grid-connected Inverters in Weak Grid
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摘要
Obvious resonance peak will be generated when parallel photovoltaic grid-connected inverters are connected to the weak grid with high grid impedance, which seriously affects the stability of grid-connected operation of the photovoltaic system. To overcome the problems mentioned above, the mathematical model of the parallel photovoltaic inverters is established. Several factors including the impact of the reference current of the grid-connected inverter, the grid voltage interference and the current disturbance between the photovoltaic inverters in parallel with the grid-connected inverters are analyzed. The grid impedance and the LCL filter of the photovoltaic inverter system are found to be the key elements which lead to existence of resonance peak. This paper presents the branch voltage and current double feedback suppression method under the premise of not changing the topological structure of the photovoltaic inverter, which effectively handles the resonance peak, weakens the harmonic content of the grid current of the photovoltaic grid-connected inverter and the voltage at the point of common coupling, and improves the stability of the parallel operation of the photovoltaic grid-connected inverters in weak grid. At last, the simulation model is established to verify the reliability of this suppression method.
Obvious resonance peak will be generated when parallel photovoltaic grid-connected inverters are connected to the weak grid with high grid impedance, which seriously affects the stability of grid-connected operation of the photovoltaic system. To overcome the problems mentioned above, the mathematical model of the parallel photovoltaic inverters is established. Several factors including the impact of the reference current of the grid-connected inverter, the grid voltage interference and the current disturbance between the photovoltaic inverters in parallel with the grid-connected inverters are analyzed. The grid impedance and the LCL filter of the photovoltaic inverter system are found to be the key elements which lead to existence of resonance peak. This paper presents the branch voltage and current double feedback suppression method under the premise of not changing the topological structure of the photovoltaic inverter, which effectively handles the resonance peak, weakens the harmonic content of the grid current of the photovoltaic grid-connected inverter and the voltage at the point of common coupling, and improves the stability of the parallel operation of the photovoltaic grid-connected inverters in weak grid. At last, the simulation model is established to verify the reliability of this suppression method.
Obvious resonance peak will be generated when parallel photovoltaic grid-connected inverters are connected to the weak grid with high grid impedance, which seriously affects the stability of grid-connected operation of the photovoltaic system. To overcome the problems mentioned above, the mathematical model of the parallel photovoltaic inverters is established. Several factors including the impact of the reference current of the grid-connected inverter, the grid voltage interference and the current disturbance between the photovoltaic inverters in parallel with the grid-connected inverters are analyzed. The grid impedance and the LCL filter of the photovoltaic inverter system are found to be the key elements which lead to existence of resonance peak. This paper presents the branch voltage and current double feedback suppression method under the premise of not changing the topological structure of the photovoltaic inverter, which effectively handles the resonance peak, weakens the harmonic content of the grid current of the photovoltaic grid-connected inverter and the voltage at the point of common coupling, and improves the stability of the parallel operation of the photovoltaic grid-connected inverters in weak grid. At last, the simulation model is established to verify the reliability of this suppression method.
引文
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[12]F.Wang,J.L.Duarte,M.A.M.Hendrix,P.F.Ribeiro.Modeling and analysis of grid harmonic distortion impact of aggregated DG inverters.IEEE Transactions on Power Electronics,vol.26,no.3,pp.786-797,2011.
[13]J.W.He,Y.W.Li,D.Bosnjak,B.Harris.Investigation and active damping of multiple resonances in a parallel-inverterbased microgrid.IEEE Transactions on Power Electronics,vol.28,no.1,pp.234-246,2013.
[14]X.Zhang,C.Z.Yu,F.Liu,F.Li,H.Z.Xu,Y.J.Wang,H.Ni.Modeling and resonance analysis of multi-paralleled grid-tied inverters in PV systems.Proceedings of the CSEE,vol.34,no.3,pp.336-345,2014.(in Chinese)
[15]J.L.Agorreta,M.Borrega,J.L′opez,L.Marroyo.Modeling and control of N-paralleled grid-connected inverters with LCL filter coupled due to grid impedance in PVplants.IEEE Transactions on Power Electronics,vol.26,no.3,pp.770-785,2011.
[2]X.Du,L.Zhou,K.Guo,M.Yang,Q.Liu,N.B.Shao.Static voltage stability analysis of large-scale photovoltaic plants.Power System Technology,vol.39,no.12,pp.3427-3434,2015.(in Chinese)
[3]X.L.Wang,Z.C.Wu,C.Qu.Reliability and capacity value evaluation of photovoltaic generation systems.Proceedings of the CSEE,vol.34,no.1,pp.15-21,2014.(in Chinese)
[4]National Energy Administration.The Photovoltaic power generation related statistical data in 2015.[Online],Available:http://www.nea.gov.cn/2016-02/05/c135076636.htm,June 23,2016.
[5]P.Y.Xin.Research on Solar Power Technology Economic Evaluation and Application Prospect,Master dissertation,North China Electric Power University,China,2015.(in Chinese)
[6]R.Sridhar,S.Jeevananthan,S.S.Dash,N.T.Selvan.Unified MPPT controller for partially shaded panels in a photovoltaic array.International Journal of Automation and Computing,vol.11,no.5,pp.536-542,2014.
[7]Z.M.Zhao,J.Z.Liu,X.Y.Sun,L.Q.Yuan.Solar Energy Photovoltaic Power Generation and Its Application,Beijing,China:Science Press,pp.83-107,2006.(in Chinese)
[8]C.L.Li,X.K.Yang.Grid-Connected Technology of Solar and Wind Power,Beijing,China:China Water&Power Press,pp.284-287,2011.(in Chinese)
[9]H.Nian,T.Wang,P.Cheng.An unbalanced voltage decoupling compensation technique for DFIG adaptive to grid impedance.Automation of Electric Power Systems,vol.39,no.23,pp.49-57,2015.(in Chinese)
[10]C.X.Dou,F.Zhao,X.B.Jia,D.L.Liu.Hinf tyrobust control of DC-AC interfaced microsource in microgrids.International Journal of Automation and Computing,vol.10,no.1,pp.73-78,2013.
[11]Z.Q.Wu,C.H.Xu,Y.Yang.Robust iterative learning control of single-phase grid-connected inverter.International Journal of Automation and Computing,vol.11,no.4,pp.404-411,2014.
[12]F.Wang,J.L.Duarte,M.A.M.Hendrix,P.F.Ribeiro.Modeling and analysis of grid harmonic distortion impact of aggregated DG inverters.IEEE Transactions on Power Electronics,vol.26,no.3,pp.786-797,2011.
[13]J.W.He,Y.W.Li,D.Bosnjak,B.Harris.Investigation and active damping of multiple resonances in a parallel-inverterbased microgrid.IEEE Transactions on Power Electronics,vol.28,no.1,pp.234-246,2013.
[14]X.Zhang,C.Z.Yu,F.Liu,F.Li,H.Z.Xu,Y.J.Wang,H.Ni.Modeling and resonance analysis of multi-paralleled grid-tied inverters in PV systems.Proceedings of the CSEE,vol.34,no.3,pp.336-345,2014.(in Chinese)
[15]J.L.Agorreta,M.Borrega,J.L′opez,L.Marroyo.Modeling and control of N-paralleled grid-connected inverters with LCL filter coupled due to grid impedance in PVplants.IEEE Transactions on Power Electronics,vol.26,no.3,pp.770-785,2011.
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