CAJ | 학술논문

为改善微电网电能质量,解决微电网独立控制有功和无功控制问题,分析了两电平三相三线制电压源逆变器的控制方案,建立数学模型,运用瞬时功率理论推导出参考电流计算公式,提出由内外两层组成的串级控制策略. 内层控制器采用内模一阶过程控制技术调节q轴和d轴的交流电流实现电流控制,外层控制器采用内模二阶过程的前馈控制策略实现直流母线电压控制. 通过仿真验证,该控制策略可以有效的进行微电网逆变器有功和无功控制,实现逆变器跟随电网电压跌落自动调节直流侧电压功能,为改善微电网电能质量控制研究提供了一种新方法.
위개선미전망전능질량,해결미전망독립공제유공화무공공제문제,분석료량전평삼상삼선제전압원역변기적공제방안,건립수학모형,운용순시공솔이론추도출삼고전류계산공식,제출유내외량층조성적천급공제책략. 내층공제기채용내모일계과정공제기술조절q축화d축적교류전류실현전류공제,외층공제기채용내모이계과정적전궤공제책략실현직류모선전압공제. 통과방진험증,해공제책략가이유효적진행미전망역변기유공화무공공제,실현역변기근수전망전압질락자동조절직류측전압공능,위개선미전망전능질량공제연구제공료일충신방법.
In order to improve power quality of micro-grid and solve the problem that micro-grid controls active and re-active power by itself, the control scheme of two level voltage source inverter of three-phase three-wire voltage system is analyzed.Then the mathematical model is constituted, the expression of reference current is deduced by instantane-ous power theory, and the cascade control strategy of micro-grid inverter structure is proposed, which is composed of inter and outer controllers.On the one hand, the internal model control with one-order process is put forward to realize current control by adjusting alternating current of q axis and d axis.On the other hand, the feed forward control of in-ternal model with two-order process is presented to achieve DC bus voltage control in the outer controller.Through simulation verification, the control strategy can be effective for active and reactive power control of micro grid inverter. therefore, the inverter can follow grid voltage sag and self-adjust DC side voltage, which provides a new method for the study of improving power quality of micro-grid.