CAJ | 학술논문

针对微电网的故障电流小、潮流双向性等特性，提出了适合微电网的保护策略并进行了仿真。传统的基于过电流的电网保护技术对于微电网的保护受到一定限制，因而需要对新的技术进行探索。在对这些因素分析的基础上，提出了微电网的保护策略：通过小波变换对电流行波进行分析判断故障位置，母线电压确定故障发生与否及扰动电压判断故障类型。利用SVPWM控制原理在Matlab/Simulink中使用SimPowerSystems搭建微电网的模型，并对孤岛运行模式下微电网不同的故障类型进行仿真分析，仿真结果表明所提出的保护策略在孤岛运行的方式下是有效的。
침대미전망적고장전류소、조류쌍향성등특성，제출료괄합미전망적보호책략병진행료방진。전통적기우과전류적전망보호기술대우미전망적보호수도일정한제，인이수요대신적기술진행탐색。재대저사인소분석적기출상，제출료미전망적보호책략：통과소파변환대전류행파진행분석판단고장위치，모선전압학정고장발생여부급우동전압판단고장류형。이용SVPWM공제원리재Matlab/Simulink중사용SimPowerSystems탑건미전망적모형，병대고도운행모식하미전망불동적고장류형진행방진분석，방진결과표명소제출적보호책략재고도운행적방식하시유효적。
Based on the characteristics of microgrid, for example small fault current, the bidirectional powerflow, etc, a protection scheme is proposed and simulated. The traditional protection scheme based on overcurrent has some restrictions on the microgrid protection, thus a novel protection needs to be explored. Based on the analysis of the above factors, a microgrid protection scheme is proposed. Wavelet transform is used in analyzing current traveling waves to identify faulted location, the bus bar voltages are used to determine whether a fault happened or not, and disturbance voltages are used to determine fault types. A microgrid model is established using SVPWM with SimPowerSystems in Matlab/Simulink, and different faults in the islanded microgrid are simulated, and the result shows that the proposed protection is valid in an islanded operating mode.