CAJ | 학술논문

分布式电源的接入改变了配电系统的网络结构及故障电流模式，可能导致原有的馈线保护出现误动、拒动及灵敏度降低等问题。为快速清除故障区域，并发挥分布式电源对系统的支撑作用，文中提出在传统的配电系统保护配置基础上装设方向纵联保护，并针对保护和断路器拒动而造成的故障电流无法切除的情况，提出加装含加速模块、方向模块、电压检测模块及反时限过电流保护的保护方案。最后通过PSCAD/EMTDC 对一个含分布式电源的10 kV配电系统进行仿真，验证了所提保护方案的有效性。
분포식전원적접입개변료배전계통적망락결구급고장전류모식，가능도치원유적궤선보호출현오동、거동급령민도강저등문제。위쾌속청제고장구역，병발휘분포식전원대계통적지탱작용，문중제출재전통적배전계통보호배치기출상장설방향종련보호，병침대보호화단로기거동이조성적고장전류무법절제적정황，제출가장함가속모괴、방향모괴、전압검측모괴급반시한과전류보호적보호방안。최후통과PSCAD/EMTDC 대일개함분포식전원적10 kV배전계통진행방진，험증료소제보호방안적유효성。
With the interconnection of distributed generations (DGs),the network structure and fault current of power distribution system are changed,which leads to the mis-operation,malfunction and sensitivity degradation of protective relays.In order to quickly clear the fault region and well play a supporting role of DGs for the system,a new protection scheme is introduced based on the traditional relay protection scheme of power distribution system. In the proposed scheme,the directional pilot protection is adopted and a acceleration module,a direction module, a voltage detection module and an inverse time over-current protection module are employed to avoid the fault current that cannot be eliminated due to the protection and the breaker malfunction.Simulated results of PSCAD/EMTDC on a 10 kV power distribution system with DGs verify the effectiveness of the proposed scheme.