摘要
为了使DSTATCOM在复杂的工况下稳定运行且具有较高的补偿能力,同时减少开关谐波对配电网造成的二次污染,采用基于正序电压同步变换的广义无功电流检测方案及基于PR控制器的分相控制策略,提出一种LCL型DSTATCOM的电流环控制器参数精确设计方法。利用频率特性分析法分析电容反馈系数和PR控制器各参数对系统电流环的影响,以系统稳定裕度和补偿性能为指标,设计出各参数的取值范围,进而依据频率特性给出符合实际工况的参数值选取优化方案。仿真与试验结果表明,所提出方法能使系统保持较高的电流无静差跟踪能力、较好的稳定性及动态性能。
In order to maintain the stable operation and high compensation ability of DSTATCOM under complex conditions, and reduce the second pollution of the power distribution network caused by the switching harmonics, this paper proposes a method for DSTATCOM with LCL filter to design the current loop controller parameters accurately. It is based on generalized reactive current detection scheme of positive sequence voltage synchronous transformation, and also based on split phase control strategy of PR controller. The influence of system current loop made by capacitive feedback coefficients and PR controller parameters can be analyzed by frequency response analysis. System stability margin and compensation capability are chosen as indexes to design the value range of its parameters. Then, according to frequency characteristics, we can get the prioritization scheme of the parameter value selection, which conforms with the actual operation. Simulation and experimental results show that the proposed method can keep higher current astatic tracking ability, better stability and dynamic property.
出处
《控制工程》
CSCD
北大核心
2017年第8期1559-1566,共8页
Control Engineering of China
基金
湖南省教育厅重点项目资助(12A136)
