CAJ | 학술논문

针对微网逆变器孤岛并联时输出阻抗控制不能兼顾动态响应和并联均流的问题，提出了一种输出阻抗解耦控制策略。该控制策略根据 dq 坐标系中输出电压的戴维南等效模型，得到不同频段的阻抗特性，分离出动稳态输出阻抗，在 dq 坐标系中直接设计输出阻抗，用以动态响应和并联均流的解耦控制。在动态电压控制时，采用输出电流微分反馈控制和动态有源阻尼来减小动态输出阻抗；在均流控制时，增大稳态输出阻抗，从而获得了良好的动态响应和并联均流性能。实验结果验证了理论分析和控制方案的正确性。
침대미망역변기고도병련시수출조항공제불능겸고동태향응화병련균류적문제，제출료일충수출조항해우공제책략。해공제책략근거 dq 좌표계중수출전압적대유남등효모형，득도불동빈단적조항특성，분리출동은태수출조항，재 dq 좌표계중직접설계수출조항，용이동태향응화병련균류적해우공제。재동태전압공제시，채용수출전류미분반궤공제화동태유원조니래감소동태수출조항；재균류공제시，증대은태수출조항，종이획득료량호적동태향응화병련균류성능。실험결과험증료이론분석화공제방안적정학성。
An output impedance decoupled control strategy for the microgrid inverter is proposed to solve the problem with the dynamic voltage response and load sharing.According to the Thevenin equivalent model of output voltage in the dq reference frame,impedance characteristics in different frequency ranges are obtained and dynamic and steady output impedances are then separated.Therefore they are designed directly in the dq reference frame for decoupled control of dynamic response and load sharing,respectively.In order to improve dynamic voltage response,output current derivative control and dynamic active damping are proposed to decrease dynamic output impedance.To improve load sharing,steady output impedance control is proposed to increase stable impedance. The effectiveness of the theoretical analysis and control strategy is verified by experimental results.