光伏并网逆变器控制策略研究
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摘要
逆变型分布式电源(inverter-based distributed generation,IBDG)以良好控制及转换电能的能力在微电网中得到了广泛的应用。将IBDG等效为直流电压源,逆变器控制采用双闭环控制策略进行并网控制。外环为电压环,主要是针对逆变器的输入端电压,控制其维持稳定;内环为电流环,主要目标是控制逆变器的输出电流与电网电压同频同相。在PSCAD/EMTDC软件中搭建逆变器模型,并通过设置负荷的投切以验证所制定的逆变器控制策略的有效性;仿真运行表明,采用双闭环控制策略的逆变器在负荷变化的情况下的输出依旧与设定的预期相符。
Inverter-based distributed generation(IBDG) supply is widely used in microgrid for its ability to control and convert electrical energy well. In this paper, IBDG is equivalent to DC voltage source, and inverter control adopts double closed-loop control strategy for grid connection control. The outer ring is a voltage loop, which is mainly for the input voltage of the inverter, and is controlled to maintain stability; The inner ring is a current loop, whose main goal is to control the output current of the inverter to be in phase with the grid voltage. The inverter model is built in the PSCAD/EMTDC, and the effectiveness of the proposed inverter control strategy is verified by setting the load switching. The simulation operation shows that the output of the inverter with double closed-loop control strategy in the case of load change is still consistent with the set expectations.
Inverter-based distributed generation(IBDG) supply is widely used in microgrid for its ability to control and convert electrical energy well. In this paper, IBDG is equivalent to DC voltage source, and inverter control adopts double closed-loop control strategy for grid connection control. The outer ring is a voltage loop, which is mainly for the input voltage of the inverter, and is controlled to maintain stability; The inner ring is a current loop, whose main goal is to control the output current of the inverter to be in phase with the grid voltage. The inverter model is built in the PSCAD/EMTDC, and the effectiveness of the proposed inverter control strategy is verified by setting the load switching. The simulation operation shows that the output of the inverter with double closed-loop control strategy in the case of load change is still consistent with the set expectations.
引文
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[15] 周雪松,宋代春,马幼捷,等.光伏发电系统的并网重复控制及仿真[J].电力电子技术,2010,44(5):8-10.ZHOU Xuesong,SONG Daichun,MA Youjie,et al.Grid-connected repetitive control and simulation of photovoltaic power generation system[J].Power Electronics,2010,44(5):8-10.
[16] 张艳霞,赵杰,邓中原.太阳能光伏并网系统的的建模与仿真[J].高电压技术,2010,36(12):3097-3102.ZHANG Yanxia,ZHAO Jie,DENG Zhongyuan.Modeling and simulation of solar photovoltaic grid-connected systems[J].High Voltage Technology,2010,36(12):3097-3102.
[2] 刘洁.微电网的馈线保护研究[D].南宁:广西大学,2017.LIU Jie.Research on feeder protection of microgrid[D].Nanning:Guangxi University,2017.
[3] 吴素农,范瑞祥,朱永强,等.分布式电源控制与运行[M].北京:中国电力出版社,2012.
[4] 文小玲,尹项跟,张哲.三相逆变器统一空间矢量PWM实现方法[J].电工技术学报,2009,24(10):87-93.WEN Xiaoling,YIN Xianggen,ZHANG Zhe.Three-phase inverter unified space vector PWM implementation method[J].Journal of Electrical Engineering,2009,24(10):87-93.
[5] 王新勇,许炜,汪显博,等.光伏并网逆变器空间电压矢量双滞环电流控制新策略[J].电力系统保护与控制,2011,29(10):110-117.WANG Xinyong,XU Wei,WANG Xianbo,et al.New strategy for double hysteresis current control of photovoltaic grid-connected inverter space voltage vector[J].Power System Protection and Control,2011,29(10):110-117.
[6] 王坚,王毅,胡灿,等.MMC型光伏并网逆变器无差拍控制策略[J].电力科学与工程,2017,33(9):8-14.WANG Jian,WANG Yi,HU Can,et al.Deadbeat control strategy of MMC type photovoltaic grid connected inverter[J].Electric Power Science and Engineering,2017,33(9):8-14.
[7] 赵倩,张建成.并网逆变器的有功无功综合控制策略研究[J].电力电容器与无功补偿,2017,38(5):154-158.ZHAO Qian,ZHANG Jiancheng.Comprehensive control strategy of active and reactive power for grid-connected inverter[J].Power Capacitor & Reactive Power Compensation,2017,38(5):154-158.
[8] 简俊威,莫超,钟其源,等.简述光伏逆变器输出无功功率的原理[J].电子世界,2017(20):72-74.
[9] ZHANG H,ZHON H W,REN J,et al.Three-phase grid-connected photovoltaic system with SVPWM current controller[C]//2009 IEEE 6th International Power Electronics and Motion Control Conference,IPEMC’09,Wuhan,China,2009:2161-2164.
[10] 刘鸿鹏,朱航,吴辉,等.新型光伏并网逆变器电压型控制方法[J].中国电机工程学报,2015,35(21):5560-5568.LIU Hongpeng,ZHU Hang,WU Hui,et al.A voltage control method for novel photovoltaic grid-connected inverters[J].Proceedings of the CSEE,2015,35(21):5560-5568.
[11] 汪海宁,苏建徽,丁明,等.光伏并网功率调节系统[J].中国电机工程学报,2007,27(2):75-79.WANG Haining,SU Jianhui,DING Ming,et al.Photovoltaic grid-connected power regulation system[J].Proceedings of the CSEE,2007,27(2):75-79.
[12] KADRI R,GAUBERT J,CHAMPENOIS G,et al.Design of a single-phase grid-connected photovoltaic system based on deadbeat current control with LCL filter[C]//14th International Power Electronics and Motion Control Conference,EPE-PEMC 2010,Ohrid,Macedonia,2010:3147-3153.
[13] JOG A N,APTE N G.An adaptive hysteresis band current controlled shunt active power filter[C]//5th International Conference-Workshop Compatibility in Power Electronics,CPE 2007,Gadansk,Poland,2007:1-5.
[14] 金建东,窦祥.三相H7电压源型光伏并网逆变器共模电压抑制[J].广东电力,2017,30(8):53-58.JIN Jiandong,DOU Xiang.Common mode voltage suppression for three-phase H7 voltage-source photovoltaic grid-connected inverter[J].Guangdong Electric Power,2017,30(8):53-58.
[15] 周雪松,宋代春,马幼捷,等.光伏发电系统的并网重复控制及仿真[J].电力电子技术,2010,44(5):8-10.ZHOU Xuesong,SONG Daichun,MA Youjie,et al.Grid-connected repetitive control and simulation of photovoltaic power generation system[J].Power Electronics,2010,44(5):8-10.
[16] 张艳霞,赵杰,邓中原.太阳能光伏并网系统的的建模与仿真[J].高电压技术,2010,36(12):3097-3102.ZHANG Yanxia,ZHAO Jie,DENG Zhongyuan.Modeling and simulation of solar photovoltaic grid-connected systems[J].High Voltage Technology,2010,36(12):3097-3102.