考虑中点电压平衡的三相四开关变换器模型预测电压控制
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摘要
三相四开关变换器作为三相六开关变换器的容错结构,在离网模式下,直流侧电流经电容流入故障相,导致直流侧中点电压不均衡,进而降低了负载侧电能质量,影响电容器寿命。针对此问题,设计一种考虑中点电压平衡的模型预测电压控制策略。首先,对离网模式下的电压矢量进行分析,建立αβ两相静止坐标系下的电压预测模型。在此基础上设计中点电压平衡控制,通过低通滤波器提取直流侧电容中点电压偏差值中的直流分量,经预测模型计算得到电流补偿值。将其代入价值函数求解最优电压矢量,进行模型预测电压控制,实现三相四开关变换器离网模式操作。该控制策略无需锁相环和PWM调制,易于实现。通过仿真及实验,验证了所提出控制策略的有效性。
The three-phase four-switch converter is a fault-tolerant structure of a three-phase six-switch converter. In the island mode, the DC-link current flows into the fault phase through the capacitor, resulting in the separation capacitor voltage unbalance, which affects the power quality of the load side and reduces the service life of the capacitor. To solve this problem, a model predictive voltage control strategy considering neutral point voltage balance is proposed. First, the voltage vector is analyzed in the island mode, and voltage prediction model is established based on αβ two-phase stationary coordinate. On this basis, the neutral point voltage balance control is designed through extracting the DC component in the midpoint voltage deviation of the DC side capacitor. The current compensation value is calculated by the prediction model and then model predictive voltage control in the inland mode is realized. The proposed control strategy does not require phase-locked loop or PWM modulation. Simulation and experiment results verify the effectiveness of the proposed control strategy.
The three-phase four-switch converter is a fault-tolerant structure of a three-phase six-switch converter. In the island mode, the DC-link current flows into the fault phase through the capacitor, resulting in the separation capacitor voltage unbalance, which affects the power quality of the load side and reduces the service life of the capacitor. To solve this problem, a model predictive voltage control strategy considering neutral point voltage balance is proposed. First, the voltage vector is analyzed in the island mode, and voltage prediction model is established based on αβ two-phase stationary coordinate. On this basis, the neutral point voltage balance control is designed through extracting the DC component in the midpoint voltage deviation of the DC side capacitor. The current compensation value is calculated by the prediction model and then model predictive voltage control in the inland mode is realized. The proposed control strategy does not require phase-locked loop or PWM modulation. Simulation and experiment results verify the effectiveness of the proposed control strategy.
引文
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[20]谭兴国,王辉,张黎,等.具有电压补偿的四开关并网逆变器等效SVPWM控制方法[J].电力系统保护与控制,2014,42(1):1-8.TAN Xingguo,WANG Hui,ZHANG Li,et al.An equivalent SVPWM control method with voltage compensation for four-switch inverter[J].Power System Protection and Control,2014,42(1):1-8.
[2]刘喜梅,戴雪梅,李梅航.基于微网技术的家庭能源管理系统研究[J].电力系统保护与控制,2017,45(20):66-72.LIU Ximei,DAI Xuemei,LI Meihang.Research on the home energy management system based on the microgrid technology[J].Power System Protection and Control,2017,45(20):66-72.
[3]EAJAL A A.ABDELWAHED M A,EL-SAADANY E F,et al.A unified approach to the power flow analysis of AC/DC hybrid microgrids[J].IEEE Transactions on Sustainable Energy,2016,7(3):1145-1158.
[4]CHEN Xia,SHI Mengxuan,SUN Haishun,et al.Distributed cooperative control and stability analysis of multiple DC electric springs in a DC microgrid[J].IEEETransactions on Industrial Electronics,2018,65(7):5611-5622.
[5]YANG P,XIA Y,YU M,et al.A decentralized coordination control method for parallel bidirectional power converters in a hybrid AC/DC microgrid[J].IEEETransactions on Industrial Electronics,2018,65(8):6217-6288.
[6]WANG P,JIN C,ZHU D.Distributed control for autonomous operation of a three-port AC/DC/DS hybrid microgrid[J].IEEE Transactions on Industrial Electronics,2015,62:1279-1290.
[7]HAIDER S,LI Guojie,WANG Keyou.A dual control strategy for power sharing improvement in islanded mode of AC microgrid[J].Protection and Control of Modern Power Systems,2018,3(3):111-118.DOI:10.1186/s41601-018-0084-2.
[8]李林,单喜斌,宋宗勋.基于DFIG控制方法的微电网的并网及孤岛运行方式分析[J].电力系统保护与控制,2017,45(17):158-163.LI Lin,SHAN Xibin,SONG Zongxun.Operation mode analysis of micro-grid grid-connected and island based on DFIG control method[J].Power System Protection and Control,2017,45(17):158-163.
[9]丁明,史盛亮,刘新宇,等.交直流混合微网优化配置研究[J].电力系统保护与控制,2018,46(14):17-25.DING Ming,SHI Shengliang,LIU Xinyu,et al.Study of optimal configuration of a hybrid AC/DC microgrid[J].Power System Protection and Control,2018,46(14):17-25.
[10]吴雨,潘文霞,冯蒙霜,等.基于混合储能的微电网功率控制策略[J].电力系统及其自动化学报,2013,25(2):109-114.WU Yu,PAN Wenxia,FENG Mengshuang,et al.Power control strategy for microgrid based on hybrid energy storage system[J].Proceedings of the CSU-EPSA,2013,25(2):109-114.
[11]ABBEY C,JOOS G.Effect of low voltage ride through(LVRT)characteristic on voltage stability[C]//IEEEPower Engineering Society General Meeting,June 16-16,2005,San Francisco,CA,USA:1901-1907.
[12]ZHANG W P,XU D H,ENJETI P N,et al.Survey on fault-tolerant techniques for power electronic converters[J].IEEE Transactions on Power Electronics,2014,29(12):6319-6331.
[13]安群涛,孙醒涛,赵克,等.容错三相四开关逆变器控制策略[J].中国电机工程学报,2010,30(3):14-20.AN Quntao,SUN Xingtao,ZHAO Ke,et al.Control strategy for fault-tolerant three-phase four-switch inverters[J].Proceedings of the CSEE,2010,30(3):14-20.
[14]刘勇超,葛兴来,蒲俊楷,等.四开关三相逆变器全调制度范围内两种等效PWM算法[J].电工技术学报,2017,32(2):206-215.LIU Yongchao,GE Xinglai,PU Junkai,et al.Two types of equivalent PWM algorithms in the full modulation region for four-switch three-phase inverter[J].Transactions of China Electrotechnical Society,2017,32(2):206-215.
[15]滕青芳,靳宇星,李姝湲,等.基于MRAS观测器的三相四开关逆变器驱动PMSM系统模型预测电流控制[J].信息与控制,2017,46(2):165-171.TENG Qingfang,JIN Yuxing,LI Shuyuan,et al.Model predictive current control for PMSM systems driven by a three-phase four-switch inverter based on a MRASobserver[J].Information and Control,2017,46(2):165-171.
[16]侯世英,宋星,孙韬,等.基于空间矢量滞环控制的新型容错三相四开关并网逆变器[J].电力系统保护与控制,2011,39(21):138-144.HOU Shiying,SONG Xing,SUN Tao,et al.A novel topology of fault-tolerant three-phase four-switch gridconnected inverter based on space vector hysteresis control[J].Power System Protection and Control,2011,39(21):138-144.
[17]MORREN J,DE HAAN S W H.Ride through of wind turbines with doubly-fed induction generator during a voltage dip[J].IEEE Transactions on Energy Conversion,2005,20(2):435-441.
[18]FREIRE N M A,CARDOSO A J M.A fault-tolerant direct controlled PMSG drive for wind energy conversion systems[J].IEEE Transactions on Industrial Electronics,2013,61(2):821-834.
[19]郑玮仪,曾志勇,赵荣祥.容错型三相并网变换器的建模分析与矢量调制[J].中国电机工程学报,2016,36(8):2202-2212.ZHENG Weiyi,ZENG Zhiyong,ZHAO Rongxiang.Modeling and modulation of the fault-tolerant gridconnected three-phase PWM converters[J].Proceedings of the CSEE,2016,36(8):2202-2212.
[20]谭兴国,王辉,张黎,等.具有电压补偿的四开关并网逆变器等效SVPWM控制方法[J].电力系统保护与控制,2014,42(1):1-8.TAN Xingguo,WANG Hui,ZHANG Li,et al.An equivalent SVPWM control method with voltage compensation for four-switch inverter[J].Power System Protection and Control,2014,42(1):1-8.