孤岛微电网高频和低频稳定性关联研究
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摘要
针对采用下垂控制策略的孤岛微电网中高频和低频稳定性关联问题进行研究。首先进行逆变器建模,通过基于阻抗的Nyquist稳定判据判断系统的高频稳定性。然后经过公式推导发现系统中存在的高频谐波会在功率计算中产生偏差,进而影响系统的低频稳定性。其次通过改变电压电流环控制参数或添加输出电流前馈控制方案去除高频谐波,同时达到改善低频稳定性的效果。最后,仿真和实验结果证明上述分析的正确性。
The connections between high-frequency and low-frequency oscillations in islanded microgrid were researched in this paper. The high-frequency harmonic stability was assessed by the impedance-based Nyquist stability criterion. The instantaneous power calculation is affected by the high-frequency harmonic components because the lowpass filter can not inhibit harmonic waves. Furthermore,the low-frequency stability margin is decreased due to the higher instantaneous power. Moreover,an inverter current feedforward control scheme was proposed to mitigate the highfrequency oscillations and improves the low-frequency stability. Lastly,the PSCAD/EMTDC simulation and experiment were performed to verify theoretical analysis and validate the effectiveness of the scheme.
The connections between high-frequency and low-frequency oscillations in islanded microgrid were researched in this paper. The high-frequency harmonic stability was assessed by the impedance-based Nyquist stability criterion. The instantaneous power calculation is affected by the high-frequency harmonic components because the lowpass filter can not inhibit harmonic waves. Furthermore,the low-frequency stability margin is decreased due to the higher instantaneous power. Moreover,an inverter current feedforward control scheme was proposed to mitigate the highfrequency oscillations and improves the low-frequency stability. Lastly,the PSCAD/EMTDC simulation and experiment were performed to verify theoretical analysis and validate the effectiveness of the scheme.
引文
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[2]Mollerstedt E,Bernhardsson B.Out of control because of harmonics-An analysis of the harmonic response of an inverter locomotive[J].IEEE Control Systems,2000,20(4):70-81.
[3]Wang Fei,Duarte J L,Hendrix M A M,et al.Modelling and analysis of grid harmonic distortion impact of aggregated DG inverters[J].IEEETransactions on Power Electronics,2011,26(3):786-797.
[4]Wang Xiongfei,Blaabjerg F,Poh Chiang Loh,et al.Grid-current-feedback active damping for LCLresonance in grid-connected voltage-source converters[J].IEEE Transactions on Power Electronics,2016,31(1):213-223.
[5]Dong Dong,Wen Bo,Boroyevich D,et al.Analysis of phase-locked loop low-frequency stability in three-phase grid-connected power converters considering impedance interactions[J].IEEE Transactions on Industrial Electronics,2015,62(1):310-321.
[6]Radwan A A A,Mohamed Y A I.Modeling,analysis and stabilization of converter-fed AC microgrids with high penetration of converter-interfaced loads[J].IEEETransactions on Smart Grid,2012,3(3):1213-1225.
[7]Sun Jian.Impedance-based stability criterion for gridconnected inverters[J].IEEE Transactions on Power Electronics,2011,26(11):3075-3078.
[8]Wang Xiongfei,Blaabjerg F,Wu Weimin,et al.Modeling and analysis of harmonic stability in an ACpower-electronics-based power system[J].IEEETransactions on Power Electronics,2014,29(12):6421-6432.
[9]Wang Xiongfei,Blaabjerg F,Liserre M,et al.An active damper for stabilizing power-electronics-based ACsystems[J].IEEE Transactions on Power Electronics,2014,29(7):3318-3329.
[10]Tao Yang,Liu Quanwei,Deng Yan,et al.Analysis and mitigation of inverter output impedance impacts for distributed energy resource interface[J].IEEETransactions on Power Electronics,2015,30(7):3563-3576.
[11]Pogaku N,Prodanovic M,Green T.Modeling,analysis and testing of autonomous operation of an inverter-based microgrid[J].IEEE Transactions on Power Electronics,2007,22(2):613-625.
[12]Kahrobaeian A,Mohamed A.Analysis and mitigation of low-frequency instabilities in autonomous medium voltage converter-based microgrids with dynamic loads[J].IEEE Transactions on Industrial Electronics,2014,61(4):1643-1658.
[13]Wang Xiongfei,Blaabjerg F,Chen Zhe,et al.Resonance analysis in parallel voltage-controlled distributed generation inverters[A].Applied Power Electronics Conference and Exposition(APEC),2013Twenty-Eighth Annual IEEE[C],Long Beach,CA,2013,2977-2983.
[14]Mohamed A R I,EI-Saadany E F.Adaptive decentralized droop controller to preserve power sharing stability of paralleled inverters in distributed generation microgrids[J].IEEE Transactions on Power Electronics,2008,23(6):2806-2816.