CAJ | 학술논문

微电网在并网和孤岛两种不同运行模式下的短路电流计算是建立微电网保护的重要基础。针对目前由逆变型分布式电源(distributed generation，DG)组成的微电网在孤岛运行时短路计算研究的空白，提出一种含V/f控制DG的微电网故障分析方法。通过分析DG的控制特性，充分计及控制策略的影响，理论推导出DG故障等值模型；利用电力系统仿真软件PSCAD/EMTDC建立含V/f控制DG微电网模型，揭示DG在故障时的暂态特性；基于上述DG故障等值模型，建立微电网故障方程组，进而提出精确的微电网故障稳态分析解析法；最后，通过仿真算例，验证了所提方法的准确性和有效性。
미전망재병망화고도량충불동운행모식하적단로전류계산시건립미전망보호적중요기출。침대목전유역변형분포식전원(distributed generation，DG)조성적미전망재고도운행시단로계산연구적공백，제출일충함V/f공제DG적미전망고장분석방법。통과분석DG적공제특성，충분계급공제책략적영향，이론추도출DG고장등치모형；이용전력계통방진연건PSCAD/EMTDC건립함V/f공제DG미전망모형，게시DG재고장시적잠태특성；기우상술DG고장등치모형，건립미전망고장방정조，진이제출정학적미전망고장은태분석해석법；최후，통과방진산례，험증료소제방법적준학성화유효성。
The fault analysis of microgrid in grid-connected and islanded mode is the important basis of building protection. For the research gap of fault analysis in isolated microgrid which consisted of inverter interfaced distributed generations (DG), this paper proposes a fault analysis method for the microgrid containing V/f control DG. The control characteristic of DG is analyzed and the DG equivalent model is derived with taking the influence of control strategy into account. The fault transient characteristic of DG is analyzed with the microgrid model consisted of V/f control DG built in PSCAD/EMTDC. Furthermore, the paper builds the fault analysis equations with the above equivalent model and an analytical method is proposed for the microgrid fault analysis. At last, test results verify the feasibility and validity of the proposed method.