CAJ | 학술논문

为了实现微网在不同模式下稳定运行,设计了一种外环采用逆变器出口电压反馈、中环采用电容电压反馈、内环采用电容电流反馈的多环反馈控制器.通过劳斯-赫尔维茨稳定判据与极点配置的方法计算控制器参数,形成了输出阻抗低频段为感性、高频段为阻性的分布式电源外特性,实现了微网内多逆变单元之间的无线通信下垂控制.所设计的多环控制器在联网运行模式下能够改善系统的稳定性,输出高质量的电能,且具有较快的动态响应速度.在孤岛运行模式下,能够保证负荷电压和频率的稳定性以及多逆变单元之间功率共享,还可实现不同运行模式之间的平滑切换.该多环控制器设计简单,实用有效,易于实施.仿真结果表明其具有合理性和有效性.
위료실현미망재불동모식하은정운행,설계료일충외배채용역변기출구전압반궤、중배채용전용전압반궤、내배채용전용전류반궤적다배반궤공제기.통과로사-혁이유자은정판거여겁점배치적방법계산공제기삼수,형성료수출조항저빈단위감성、고빈단위조성적분포식전원외특성,실현료미망내다역변단원지간적무선통신하수공제.소설계적다배공제기재련망운행모식하능구개선계통적은정성,수출고질량적전능,차구유교쾌적동태향응속도.재고도운행모식하,능구보증부하전압화빈솔적은정성이급다역변단원지간공솔공향,환가실현불동운행모식지간적평활절환.해다배공제기설계간단,실용유효,역우실시.방진결과표명기구유합이성화유효성.
In order to keep microgrid stable in different modes, a cascaded control strategy with multiple feedback loops, namely output voltage, capacitor voltage and capacitance current, is designed. The control parameters are calculated by forward combined method of zero-pole offset and Routh-Hurwitz criterion. The characteristics of DG output are inductive in low-frequency range and resistive in high-frequency range. Droop control in case of wireless communication is realized in inverters of microgrid. This designed control strategy is able to improve system stability, keep high power quality, and be provided with fast dynamic response in grid-connected mode. The strategy ensures the stability of load voltage and frequency and share of the load power between the inverters in islanding mode, which can realize smooth switch between different modes. The control strategy is designed to be practical, effective, and easy to be implemented. Simulation results verify that it is reasonable and effective. This work is supported by National Natural Science Foundation of China (No. 51277193 and No. 50907021).