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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 make DSTATCOM run stably in complex conditions with high compensation ability and reduce secondary pollution caused by switching harmonics on distribution network, a generalized reactive current detection scheme based on positive sequence voltage synchronous conversion PR controller phase-split control strategy, proposed an LCL type DSTATCOM current loop controller parameters accurate design method. The frequency characteristic analysis method is used to analyze the influence of the capacitance feedback coefficient and the PR controller parameters on the current loop of the system. The stability margin and the compensation performance of the system are taken as indices to design the range of each parameter, and then the real- The parameter value of working condition chooses the optimization plan. Simulation and experimental results show that the proposed method can make the system maintain a high current no-static tracking ability, good stability and dynamic performance.