CAJ | 학술논문

由于独立运行的微网中馈线阻抗不匹配，采用传统下垂控制策略的分布式电源难以精确地分配输出功率。针对该问题，提出了一种改进的分布式电源无功功率精确分配下垂控制策略。在该策略中，中心控制器采用低带宽通信向各个分布式电源发送交流母线电压偏离补偿信号，分布式电源的本地控制器获取该补偿信号后，通过积分构造出输出电压的幅值参考。采用所提出的下垂控制策略，各分布式电源在实现无功功率精确分配的同时，可以有效消除交流母线的电压降，将母线电压恢复至额定值。仿真结果表明，所提出的改进下垂控制策略在复阻抗特性馈线微网中具有一定的有效性和可行性。
유우독립운행적미망중궤선조항불필배，채용전통하수공제책략적분포식전원난이정학지분배수출공솔。침대해문제，제출료일충개진적분포식전원무공공솔정학분배하수공제책략。재해책략중，중심공제기채용저대관통신향각개분포식전원발송교류모선전압편리보상신호，분포식전원적본지공제기획취해보상신호후，통과적분구조출수출전압적폭치삼고。채용소제출적하수공제책략，각분포식전원재실현무공공솔정학분배적동시，가이유효소제교류모선적전압강，장모선전압회복지액정치。방진결과표명，소제출적개진하수공제책략재복조항특성궤선미망중구유일정적유효성화가행성。
Due to the mismatched feeders in an islanded microgrid,distributed generators (DGs) with conventional droop controller cannot share reactive power accurately.Aiming to solve this problem,an improved droop control strategy of accurate reactive power sharing is proposed.In the proposed scheme,the central controller sends the voltage deviation compensation signal to each DG via low bandwidth communication,and local controller of each DG integrates the signal to generate output voltage amplitude reference.Based on the proposed droop control strategy,each DG can realize accurate reactive power sharing and effectively eliminate voltage drop of AC bus.Hence,voltage restoration can also be realized in the microgrid.Simulation results indicate that the proposed droop control strategy is effective and feasible in the microgrid with complex impedance characteristics of feeders.