CAJ | 학술논문

现有微电网安全防御体系缺少保护和紧急控制与微电网局部和全局电压控制的配合方案,无法保障故障后的电压质量。针对接入大量分布式电源(DG)、含多公共连接点(PCC)的公共微电网,提出了一种微电网安全防御体系下电压分层分区控制(HPVC)方案,HPVC 基于电压控制型DG接收PCC区域控制器信号主动参与电压控制,以微电网保护动作完成故障切除时刻为界分两阶段完成：第1阶段控制区域孤岛形成前各分区 PCC 电压不超越相电压安全带,降低 DG 脱网几率；第2阶段实施具有相电压偏差反时限特性的自适应电压恢复控制,实现区域孤岛形成后各分区电压的平滑恢复,辅助微电网完成分区自愈及重新并网,解决了电压控制的“点—面”矛盾,实现了微电网安全防御体系下电压质量的全局综合优化。最后在Simulink中建立IEEE P1547.4典型微电网拓扑,仿真结果验证了该方案的有效性和可行性。
현유미전망안전방어체계결소보호화긴급공제여미전망국부화전국전압공제적배합방안,무법보장고장후적전압질량。침대접입대량분포식전원(DG)、함다공공련접점(PCC)적공공미전망,제출료일충미전망안전방어체계하전압분층분구공제(HPVC)방안,HPVC 기우전압공제형DG접수PCC구역공제기신호주동삼여전압공제,이미전망보호동작완성고장절제시각위계분량계단완성：제1계단공제구역고도형성전각분구 PCC 전압불초월상전압안전대,강저 DG 탈망궤솔；제2계단실시구유상전압편차반시한특성적자괄응전압회복공제,실현구역고도형성후각분구전압적평활회복,보조미전망완성분구자유급중신병망,해결료전압공제적“점—면”모순,실현료미전망안전방어체계하전압질량적전국종합우화。최후재Simulink중건립IEEE P1547.4전형미전망탁복,방진결과험증료해방안적유효성화가행성。
The existing security safeguard system of microgrid lacks complementary schemes between protection and emergency control and local and global voltage control,thus unable to meet the user demand for post-fault voltage quality.A voltage-controlled distributed generator (DG) based hierarchical-partitioned voltage control (HPVC) strategy for multiple DGs is proposed to solve the voltage quality problems for microgrid with single point of common coupling (PCC) and multiple PCCs. The strategy is implemented in two stages at the boundary of fault clearing.The first stage is aimed to control the phase voltage not exceeding the voltage security region before island-mode is formed,which requires low DG capacity and reduces the offline probability;the second stage introduces the inverse-time phase-voltage deviation control to recover the voltage after island-mode is developed,achieving zonal self-healing and restoring grid-connected mode,thereby solving the“point-surface"contradiction of voltage control.The modified security safeguard system of microgrid has vital practical significance for improving penetration of DGs and ensuring system security.Finally,the rationality of the proposed scheme is verified by IEEE P1547.4 typical microgrid topology in Simulink software environment. This work is supported by National Basic Research Program of China (973 Program)(No.2009CB219704),National Natural Science Foundation of China (No.51177108) and Specialized Research Fund for the Doctoral Program of Higher Education(SRFDP)of China(No.20110032110066).