低压配电网三相不平衡下的DSTATCOM优化控制
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摘要
三相不平衡低压配电网中含有负序、零序分量以及谐波,导致有功和无功功率波动的电能质量问题.为更好地抑制谐波,提出低压配电网三相不平衡下的DSTATCOM优化控制方法:DSTATCOM输出端选用LCL滤波器对电流进行滤波;选用PR控制电流环对正弦量直接进行跟踪调节.控制系统可以省去多个Park变换,避免解耦控制.由仿真分析可知,PR控制可以在更短的时间内达到与PI控制相同的补偿效果,验证了本文控制方法的有效性和可行性.
The power quality problem of active and reactive power is caused by the negative sequence and zero sequence components as well as harmonics in the three-phase unbalanced low voltage grid. In order to suppress the harmonics better,the method of optimization control for DSTATCOM in low-voltage three-phase unbalance distribution network is proposed: use the PR control current loop,we can directly track the amount of sine adjustment. The control system can save a lot of Park transformation,and avoid the decoupling control. The simulation results show PR control can achieve the same compensation with the PI control in a shorter period. The feasibility and effectiveness of control method is verified.
The power quality problem of active and reactive power is caused by the negative sequence and zero sequence components as well as harmonics in the three-phase unbalanced low voltage grid. In order to suppress the harmonics better,the method of optimization control for DSTATCOM in low-voltage three-phase unbalance distribution network is proposed: use the PR control current loop,we can directly track the amount of sine adjustment. The control system can save a lot of Park transformation,and avoid the decoupling control. The simulation results show PR control can achieve the same compensation with the PI control in a shorter period. The feasibility and effectiveness of control method is verified.
引文
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[12]周宏伟,黄晓明.不平衡负载下DSTATCOM非线性控制研究[J].电力电子技术,2017,51(8):116-120.
[13]郭亚楠,韩晓燕,孙继卫.三相不平衡负载下静止同步补偿器控制策略研究[J].水电能源科学,2017,35(9):177-181.
[2]罗安,欧剑波,唐杰,等.补偿配电网电压不平衡的静止同步补偿器控制方法研究[J].中国电机工程学报,2009,29(6):55-60.
[3]杨承上.电网电压含谐波情况下STATCOM的控制[D].杭州:浙江大学,2013.
[4]韩冬.三电平DSTATCOM调制策略研究[D].北京:中国矿业大学,2016.
[5]仇志凌.基于LCL滤波器的三相三线并网变流器若干关键技术研究[D].杭州:浙江大学,2009.
[6]肖磊,黄守道,黄科元,等.直驱型永磁同步风力发电机机侧变流器谐波抑制[J].中国电机工程学报,2011,31(6):31-37.
[7]李永坚,黄绍平.带LC滤波的三相逆变器的比例谐振控制[J].电力电子技术,2011,45(6):76-78.
[8]孙炳海,王剑,李永东.回馈式级联型变频器PWM整流控制及其谐波分析[J].电工技术学报,2011,26(7):210-215.
[9]黄辉先,罗骎,周鹏,等.PR控制LCL型DSTATCOM电流内环参数设计[J].控制工程,2017,24(8):1559-1566.
[10]程静思.正负序分离控制的DSTATCOM研究[D].哈尔滨:哈尔滨理工大学,2015.
[11]王俊峰,杨艳蓉.DSTATCOM并网侧LCL滤波器设计研究[J].电力电容器与无功补偿,2017,38(2):52-57.
[12]周宏伟,黄晓明.不平衡负载下DSTATCOM非线性控制研究[J].电力电子技术,2017,51(8):116-120.
[13]郭亚楠,韩晓燕,孙继卫.三相不平衡负载下静止同步补偿器控制策略研究[J].水电能源科学,2017,35(9):177-181.