非线性负载下微电网主逆变器输出侧电能质量控制策略
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摘要
针对微电网主逆变器输出侧电能质量易受其所连交流母线上非线性负载影响的问题,提出了一种适用于三相四线制微电网主逆变器的高电能质量控制策略。首先,分析了非线性负载造成主逆变器输出侧电压畸变的原因,得到了孤网运行状态下主逆变器输出侧电压谐波抑制机理。其次,解析了传统逆变器的谐波抑制方法及其物理机理,并指出了该类抑制方法的不足。然后,提出了一种基于虚拟谐波阻抗的新型谐波抑制策略,能同时适用于电流型谐波源和电压型谐波源,分析了该方法的可行性。最后,仿真结果和实验结论验证了该控制策略的有效性,该方法有效地改善了主逆变器输出电压的畸变率。
Aiming at the problem that the power quality of the output side of the microgrid main inverter is susceptible to the nonlinear load connected to the AC bus, a high power quality control strategy for three-phase four-wire microgrid main inverter is proposed. Firstly, this paper analyzes the causes of the voltage distortion at the output side of the main inverter caused by the nonlinear load, the voltage harmonic suppression mechanism of main inverter is obtained under the operation of the isolated microgrid. Secondly, the harmonic suppression method of traditional inverter and its physical mechanism are analyzed, and the deficiency of the suppression method is pointed out. Then. a new harmonic suppression strategy based on virtual harmonic impedance is proposed, which can be applied to both the current harmonic source and the voltage harmonic source,and the feasibility of the method is analyzed. Finally, The simulation and experimental results verify the correctness and practicability of the proposed control strategy. The proposed method effectively improves the quality of the output voltage of the main inverter.
Aiming at the problem that the power quality of the output side of the microgrid main inverter is susceptible to the nonlinear load connected to the AC bus, a high power quality control strategy for three-phase four-wire microgrid main inverter is proposed. Firstly, this paper analyzes the causes of the voltage distortion at the output side of the main inverter caused by the nonlinear load, the voltage harmonic suppression mechanism of main inverter is obtained under the operation of the isolated microgrid. Secondly, the harmonic suppression method of traditional inverter and its physical mechanism are analyzed, and the deficiency of the suppression method is pointed out. Then. a new harmonic suppression strategy based on virtual harmonic impedance is proposed, which can be applied to both the current harmonic source and the voltage harmonic source,and the feasibility of the method is analyzed. Finally, The simulation and experimental results verify the correctness and practicability of the proposed control strategy. The proposed method effectively improves the quality of the output voltage of the main inverter.
引文
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[14]Zhong Qingchang,Blaabjerg F,Guerrero J M,et al.Reduction of voltage harmonics for parallel-operated inverters[C]//In Proceedings of IEEE Energy Conversion Congress and Exposition(ECCE),Phoenix,Arizona,USA,2011:473-478.
[15]Baghaee H R,Mirsalim M,Gharehpetan G B,et al.Nonlinear load sharing and voltage compensation of microgrids based on harmonic power-flow calculations using radial basis function neural networks[J].IEEE Systems Journal,2016(99):1-11.
[16]Zhong Qingchang.Harmonic droop controller to reduce the voltage harmonics of inverters[J].IEEE Transactions on Industrial Electronics,2013,60(3):936-945.
[17]Zhong Qingchang.Power delivery to a current source and reduction of voltage harmonics for inverters[C]//In Proceedings of the American Control Conference(ACC),Montreal,Canada,2012:5783-5788.
[2]贾星蓓,窦春霞,岳东,等.基于多代理系统的微电网多尺度能量管理[J].电工技术学报,2016,31(17):63-73.Jia Xingbei,Dou Chunxia,Yue Dong,et al.Multipletime-scales optimal energy management in microgrid system based on multi-agent-system[J].Transactions of China Electrotechnical Society,2016,31(17):63-73.
[3]孙孝峰,郝彦丛,赵巍,等.孤岛微电网无通信功率均分和电压恢复研究[J].电工技术学报,2016,31(1):55-61.Sun Xiaofeng,Hao Yancong,Zhao Wei,et al.Research of power sharing and voltage restoration without communication for islanded microgrid[J].Transactions of China Electrotechnical Society,2016,31(1):55-61.
[4]李中雷,宋蕙慧,曲延滨.基于母线Agent的微电网孤岛协调控制策略[J].电工技术学报,2015,30(增刊1):370-376.Li Zhonglei,Song Huihui,Qu Yanbin.A coordinate control strategy of islanded microgrid based on bus agent[J].Transactions of China Electrotechnical Society,2015,30(S1):370-376.
[5]李小叶,李永丽,张玮亚,等.基于多功能并网逆变器的电能质量控制策略[J].电网技术,2015,39(2):556-562.Li Xiaoye,Li Yongli,Zhang Weiya,et al.A power quality control strategy based on multi-functional grid-connected inverter[J].Power System Technology,2015,39(2):556-562.
[6]蒋玮,陈武,胡仁杰.基于超级电容器储能的微网统一电能质量调节器[J].电力自动化设备,2014,34(1):85-90.Jiang Wei,Chen Wu,Hu Renjie.United power quality conditioner based on supercapacitor for microgird[J].Electric Power Automation Equipment,2014,34(1):85-90.
[7]De D,Ramanarayanan V.A proportional plus multiresonant controller for three-phase four-wire high-frequency link inverter[J].IEEE Transactions on Power Electronics,2010,25(4):899-906.
[8]霍群海,孔力,唐西胜.微源逆变器不平衡非线性混合负载的控制[J].中国电机工程学报,2010,30(15):10-15.Huo Qunhai,Kong Li,Tang Xisheng.Control strategy for unbalanced and nonlinear mixed load of microsource inverter[J].Proceedings of the CSEE,2010,30(15):10-15.
[9]Lim K,Choi J,Jang J,et al.P+multiple resonant control for output voltage regulation of microgrid with unbalanced and nonlinear loads[C]//The 2014international Power Electronics Conference,IEEE,Hiroshima,Japan,2014:2656-2662.
[10]Hamzeh M,Karimi H,Mokhtari H.Harmonic and negative-sequence current control in an islanded multi-bus MV microgrid[J].IEEE Transactions on Smart Grid,2014,5(1):167-176.
[11]石荣亮,张兴,刘芳,等.不平衡与非线性混合负载下的虚拟同步发电机控制策略[J].中国电机工程学报,2016,36(22):6086-6095.Shi Rongliang,Zhang Xing,Liu Fang,et al.A control strategy for unbalanced and nonlinear mixed loads of virtual synchronous generators[J].Proceedings of the CSEE,2016,36(22):6086-6095.
[12]Zhong Q C,Blaabjerg F,Guerrero J M,et al.Improving the voltage quality of an inverter via bypassing the harmonic current components[C]//In Proceedings of IEEE Energy Conversion Congress and Exposition(ECCE),Raleigh,North Carolina,2012:4037-4041.
[13]Hassan M,Ahmed S,Jean-Philippe M,et al.Harmonic power sharing with voltage distortion compensation of droop controlled islanded microgrids[J].IEEE Transactions on Smart Grid,2017,8(9):1.
[14]Zhong Qingchang,Blaabjerg F,Guerrero J M,et al.Reduction of voltage harmonics for parallel-operated inverters[C]//In Proceedings of IEEE Energy Conversion Congress and Exposition(ECCE),Phoenix,Arizona,USA,2011:473-478.
[15]Baghaee H R,Mirsalim M,Gharehpetan G B,et al.Nonlinear load sharing and voltage compensation of microgrids based on harmonic power-flow calculations using radial basis function neural networks[J].IEEE Systems Journal,2016(99):1-11.
[16]Zhong Qingchang.Harmonic droop controller to reduce the voltage harmonics of inverters[J].IEEE Transactions on Industrial Electronics,2013,60(3):936-945.
[17]Zhong Qingchang.Power delivery to a current source and reduction of voltage harmonics for inverters[C]//In Proceedings of the American Control Conference(ACC),Montreal,Canada,2012:5783-5788.