非对称故障下基于模型预测调制函数的光伏逆变器零电压穿越控制方法
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摘要
针对电网非对称故障下光伏电站在零电压穿越(ZVRT)期间的无功电流响应速度和并网电流谐波含量问题,提出一种基于模型预测调制函数的零电压穿越控制方法。该方法根据电压跌落深度给定正负序旋转坐标系下的指令电流,通过建立αβ坐标下的电流预测模型,对方差评价函数求导算出最小电流误差调制函数,并基于固定开关频率的正弦脉宽调制(SPWM)获取逆变器的驱动信号,从而实现ZVRT。仿真结果表明:与传统的PI控制和有限控制集模型预测控制ZVRT方法相比,该文方法不但可提高系统的动态响应、降低总谐波失真,而且具有运算量小、易于实现的优点。
During the period of the the zero voltage ride through(ZVRT)for photovoltaic plant under the power grid asymmetrical fault,aiming at the problem of response speed of reactive current and grid-connected harmonic current under the power grid asymmetrical fault,this paper puts forward a control method of zero voltage ride through for photovoltaic grid-connected inverter based on model predictive modulation function. According to the drop depth of voltage,instruction current in positive and negative rotating coordinates are given by this method. Through esstablishing the current's predicted model in the αβ coordinates,the modulation function of minimum current error is taken the derivation and calculated by variance evaluation function. And based on fixed switching frequency SPWM,this paper obtains a driving signal from inverter to achieve ZVRT. Simulation results show that:Compared with the traditional methods of controlling PI and finite control set model predictive control ZVRT,the method proposed in this paper improves the dynamic response of the system,reduces the total harmonic distortion,at the same time,it can be implemented easily because it involves few computation.
During the period of the the zero voltage ride through(ZVRT)for photovoltaic plant under the power grid asymmetrical fault,aiming at the problem of response speed of reactive current and grid-connected harmonic current under the power grid asymmetrical fault,this paper puts forward a control method of zero voltage ride through for photovoltaic grid-connected inverter based on model predictive modulation function. According to the drop depth of voltage,instruction current in positive and negative rotating coordinates are given by this method. Through esstablishing the current's predicted model in the αβ coordinates,the modulation function of minimum current error is taken the derivation and calculated by variance evaluation function. And based on fixed switching frequency SPWM,this paper obtains a driving signal from inverter to achieve ZVRT. Simulation results show that:Compared with the traditional methods of controlling PI and finite control set model predictive control ZVRT,the method proposed in this paper improves the dynamic response of the system,reduces the total harmonic distortion,at the same time,it can be implemented easily because it involves few computation.
引文
[1]Chen Zhe. Wind power in modern power system[J].Journal of modern power systems and clean energy,2013,1(1):2—13.
[2]Liu Xiaoge, Xu Zhao, Wong Kit Po. Recent advancement on technical requirements for gird integration of wind power[J]. Journal of Modern Power Systems And Clean Energy,2013,1(3):216—222.
[3]Teng Xianliang,Gao Zhonghe,Zhang Yingyuan,et al.Key technologies and the implementation of wind,PV and storage co-generation monitoring system[J]. Journal of Modern Power Systems and Clean Energy,2014,2(2):104—113.
[4]章激扬,李达,杨苹,等.光伏发电趋势分析[J].可再生能源,2014,32(2):127—132.[4]Zhang Jiyang,Li Da,Yang Ping,et al. Development trend analysis of photovoltaic power generation[J].Renew Energy Resources,2014,32(2):127—132.
[5]赵争鸣,雷一,贺凡波,等.大容量并网光伏电站技术综述[J].电力系统自动化,2011,35(12):101—107.[5]Zhao Zhengming,Lei Yi,He Fanbo,et al. Overview of large-scale grid-connected photovoltaic power plants[J].Automation of Electric Power System,2011,35(12):101—107.
[6]丁明,王伟胜,王秀丽,等.大规模光伏发电对电力系统影响综述[J].中国电机工程学报,2014,34(15):1—14.[6]Ding Ming,Wang Weisheng,Wang Xiuli,et al. A review on effect of large-sacle PV generation on power systems[J]. Proceedings of the CSEE,2014,34(15):1—14.
[7]康龙云,郭红霞,吴捷.分布式电源及其接入电力系统时若干研究课题综述[J].电网技术,2010,34(11):43—47.[7]Kang Longyun,Guo Hongxia,Wu Jie. Characteristics of distributed generation system and related research issues caused by connecting it to power system[J].Power System Technology,2010,34(11):43—47.
[8]E.ON Netz GmbH. Grid code high and extra high voltage[S]. Bayreuth,Germany,2006.
[9]张明光,陈晓婧.光伏并网发电系统的低电压穿越控制策略[J].电力系统保护与控制,2014,42(11):28—33.[9]Zhang Guangming,Chen Xiaojing. A control strategy of low voltage ride-through for grid-connected photovoltaic power system[J]. Power System Protection and Control,2014,42(11):28—33.
[10]Tian Hao,Gao Feng,Ma Cong. Novel low voltage ride through strategy of single-stage grid-tied photovoltaic inverter with super capacitor coupled[A]. IEEE 7th International Power Electronics and Motion Control Conference(ECCE Asia)[C],Harbin,China,2012.
[11]裴庆磊,王立果,刘丽莉,等.不同电网故障时并网型光伏逆变器的动态特性分析[J].现代电力,2013,30(2):57—63.[11]Pei Qinglei,Wang Liguo,Liu Lili,et al. Analysis on dynamic characteristics of grid-connected PV inverter under power grid fault[J]. Modern Electric Power,2013,30(2):57—63.
[12]郑飞,张军军,丁明昌.基于RTDS的光伏发电系统低电压穿越建模与控制策略[J].电力系统自动化,2012,36(22):1—6.[12]Zheng Fei, Zhang Junjun, Ding Mingchang. Low voltage ride through modeling and control strategy for photovoltaic generation system based on RTDS[J].Automation of Electric Power Systems,2012,36(22):1—6.
[13]袁晓玲,宋鹏飞,范发靖,等.光伏逆变器低电压穿越控制策略[J].电力电子技术,2013,47(3):67—70.[13]Yuan Xiaoling,Song Pengfei,Fan Fajing,et al. Low voltage ride through control strategy for PV inverters[J].Power Electronic,2013,47(3):67—70.
[14]刘伟增,周洪伟,张磊,等.电网不平衡条件下光伏并网控制策略研究[J].太阳能学报,2013,34(4):647—652.[14]Liu Weizeng,Zhou Hongwei,Zhang Lei,et al. Study on control strategy of grid-connected PV inverter under unbalanced grid conditions[J]. Acta Energiae Slaris Sinica,2013,34(4):647—652.
[15]曹笃峰,张颖,赵勇.等.光伏并网逆变器零电压穿越控制技术研究[J].太阳能学报,2016,37(2):366—372.[15]Cao Dufeng,Zhang Ying,Zhao Yong,et al. Research of control technique zero voltage ride-through for gridconnected PV inverter[J]. Acta Energiae Slaris Sinica,2013,34(4):647—652.
[16]胡永萍,光伏并网逆变器及低电压穿越控制策略研究[D].济南:山东大学,2014.[16]Hu Yongping,Research on the inverter and low voltage ride-though control strategy of grid-connected PV system[D]. Ji’nan:Shandong University,2014.
[17]贾利虎,朱永强,孙小燕,等.基于模型电流预测控制的光伏电站低电压穿越控制方法[J].电力系统自动化,2015,39(7):68—74.[17]Jia Lihu,Zhu Yongqiang,Sun Xiaoyan,et al. A control method of low voltage ride through for photovoltaic plant based on model current predictive control[J].Automation of Electric Power Systems,2015,39(7):68—74.
[18]孙小燕,朱永强,贾利虎,等.电网不对称故障下光伏逆变器预测控制方法[J].电力系统自动化,2015,39(17):81—86.[18]Sun Xiaoyan, Zhu Yongqiang, Jia Lihu, et al.Predictive control method for photovoltaic inverter under power grid unsymmetrical fault[J]. Automation of Electric Power Systems,2015,39(17):81—86.
[19]Jia Lihu, Zhu Yongqiang, Guo Wenrui, et al.Application of model current predictive control in Low voltage ride through of photovoltaic station[A]. 2014International Conference on Power System Technology[C],Chengdu,China,2014.
[20]GB/T 19964—2012,光伏发电站接入电力系统技术规定[S].[20]GB/T 19964—2012, Technical requirements for connecting photovoltaic power station to power system[S].
[21]杨勇,赵方平,阮毅,等.三相并网逆变器模型电流预测控制技术[J].电工技术学报,2011,26(6):153—159.[21]Yang Yong,Zhao Fangping,Ruan Yi,et al. Model current predictive control for three-phase gridconnected inverters[J]. Transactions of China Electrotechnical society,2011,26(6):153—159.
[2]Liu Xiaoge, Xu Zhao, Wong Kit Po. Recent advancement on technical requirements for gird integration of wind power[J]. Journal of Modern Power Systems And Clean Energy,2013,1(3):216—222.
[3]Teng Xianliang,Gao Zhonghe,Zhang Yingyuan,et al.Key technologies and the implementation of wind,PV and storage co-generation monitoring system[J]. Journal of Modern Power Systems and Clean Energy,2014,2(2):104—113.
[4]章激扬,李达,杨苹,等.光伏发电趋势分析[J].可再生能源,2014,32(2):127—132.[4]Zhang Jiyang,Li Da,Yang Ping,et al. Development trend analysis of photovoltaic power generation[J].Renew Energy Resources,2014,32(2):127—132.
[5]赵争鸣,雷一,贺凡波,等.大容量并网光伏电站技术综述[J].电力系统自动化,2011,35(12):101—107.[5]Zhao Zhengming,Lei Yi,He Fanbo,et al. Overview of large-scale grid-connected photovoltaic power plants[J].Automation of Electric Power System,2011,35(12):101—107.
[6]丁明,王伟胜,王秀丽,等.大规模光伏发电对电力系统影响综述[J].中国电机工程学报,2014,34(15):1—14.[6]Ding Ming,Wang Weisheng,Wang Xiuli,et al. A review on effect of large-sacle PV generation on power systems[J]. Proceedings of the CSEE,2014,34(15):1—14.
[7]康龙云,郭红霞,吴捷.分布式电源及其接入电力系统时若干研究课题综述[J].电网技术,2010,34(11):43—47.[7]Kang Longyun,Guo Hongxia,Wu Jie. Characteristics of distributed generation system and related research issues caused by connecting it to power system[J].Power System Technology,2010,34(11):43—47.
[8]E.ON Netz GmbH. Grid code high and extra high voltage[S]. Bayreuth,Germany,2006.
[9]张明光,陈晓婧.光伏并网发电系统的低电压穿越控制策略[J].电力系统保护与控制,2014,42(11):28—33.[9]Zhang Guangming,Chen Xiaojing. A control strategy of low voltage ride-through for grid-connected photovoltaic power system[J]. Power System Protection and Control,2014,42(11):28—33.
[10]Tian Hao,Gao Feng,Ma Cong. Novel low voltage ride through strategy of single-stage grid-tied photovoltaic inverter with super capacitor coupled[A]. IEEE 7th International Power Electronics and Motion Control Conference(ECCE Asia)[C],Harbin,China,2012.
[11]裴庆磊,王立果,刘丽莉,等.不同电网故障时并网型光伏逆变器的动态特性分析[J].现代电力,2013,30(2):57—63.[11]Pei Qinglei,Wang Liguo,Liu Lili,et al. Analysis on dynamic characteristics of grid-connected PV inverter under power grid fault[J]. Modern Electric Power,2013,30(2):57—63.
[12]郑飞,张军军,丁明昌.基于RTDS的光伏发电系统低电压穿越建模与控制策略[J].电力系统自动化,2012,36(22):1—6.[12]Zheng Fei, Zhang Junjun, Ding Mingchang. Low voltage ride through modeling and control strategy for photovoltaic generation system based on RTDS[J].Automation of Electric Power Systems,2012,36(22):1—6.
[13]袁晓玲,宋鹏飞,范发靖,等.光伏逆变器低电压穿越控制策略[J].电力电子技术,2013,47(3):67—70.[13]Yuan Xiaoling,Song Pengfei,Fan Fajing,et al. Low voltage ride through control strategy for PV inverters[J].Power Electronic,2013,47(3):67—70.
[14]刘伟增,周洪伟,张磊,等.电网不平衡条件下光伏并网控制策略研究[J].太阳能学报,2013,34(4):647—652.[14]Liu Weizeng,Zhou Hongwei,Zhang Lei,et al. Study on control strategy of grid-connected PV inverter under unbalanced grid conditions[J]. Acta Energiae Slaris Sinica,2013,34(4):647—652.
[15]曹笃峰,张颖,赵勇.等.光伏并网逆变器零电压穿越控制技术研究[J].太阳能学报,2016,37(2):366—372.[15]Cao Dufeng,Zhang Ying,Zhao Yong,et al. Research of control technique zero voltage ride-through for gridconnected PV inverter[J]. Acta Energiae Slaris Sinica,2013,34(4):647—652.
[16]胡永萍,光伏并网逆变器及低电压穿越控制策略研究[D].济南:山东大学,2014.[16]Hu Yongping,Research on the inverter and low voltage ride-though control strategy of grid-connected PV system[D]. Ji’nan:Shandong University,2014.
[17]贾利虎,朱永强,孙小燕,等.基于模型电流预测控制的光伏电站低电压穿越控制方法[J].电力系统自动化,2015,39(7):68—74.[17]Jia Lihu,Zhu Yongqiang,Sun Xiaoyan,et al. A control method of low voltage ride through for photovoltaic plant based on model current predictive control[J].Automation of Electric Power Systems,2015,39(7):68—74.
[18]孙小燕,朱永强,贾利虎,等.电网不对称故障下光伏逆变器预测控制方法[J].电力系统自动化,2015,39(17):81—86.[18]Sun Xiaoyan, Zhu Yongqiang, Jia Lihu, et al.Predictive control method for photovoltaic inverter under power grid unsymmetrical fault[J]. Automation of Electric Power Systems,2015,39(17):81—86.
[19]Jia Lihu, Zhu Yongqiang, Guo Wenrui, et al.Application of model current predictive control in Low voltage ride through of photovoltaic station[A]. 2014International Conference on Power System Technology[C],Chengdu,China,2014.
[20]GB/T 19964—2012,光伏发电站接入电力系统技术规定[S].[20]GB/T 19964—2012, Technical requirements for connecting photovoltaic power station to power system[S].
[21]杨勇,赵方平,阮毅,等.三相并网逆变器模型电流预测控制技术[J].电工技术学报,2011,26(6):153—159.[21]Yang Yong,Zhao Fangping,Ruan Yi,et al. Model current predictive control for three-phase gridconnected inverters[J]. Transactions of China Electrotechnical society,2011,26(6):153—159.
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