基于动态参数滤波的微电网逆变器负序功率分配策略

Negative sequence power sharing strategy for microgrid inverters based on dynamic parameter filtering

由于微电网中各逆变器所对应的负序阻抗不一致,导致负序功率不能得到合理分配。对此,提出了一种以动态参数滤波为基础的功率耦合控制策略。在电压控制环中构造正序有功功率的自适应虚拟阻抗,并将负序功率信息注入到频率控制环中,稳态时使各逆变器所对应的负序阻抗近似相等,实现了负序功率的合理分配。针对功率的注入会影响系统频率质量这一问题,通过动态参数滤波器提升系统频率质量,并改善负序功率的响应速度。该方法具有较好的鲁棒性及动态响应性能,经Simulink仿真验证了其可行性和有效性。

Due to the inconsistency of the negative sequence impedance of each inverter unit in the microgrid,the negative sequence power can’t be reasonably distributed.To solve the problem,a power coupling control strategy based on dynamic parameter filtering is proposed.The adaptive virtual impedance of positive sequence active power is constructed in the voltage control loop,and the negative sequence power information is introduced into the frequency droop loop.In a steady state,the negative sequence impedance of each inverter is approximately equal,and the reasonable distribution of negative sequence power is obtained.As the infusion of the power will affect the frequency quality of the system,the frequency quality of the system and the response speed of negative sequence power are improved by the dynamic parameter filter.The proposed method has good robustness and dynamic response performance,and the Simulink simulation shows the feasibility and effectiveness of the method.