CAJ | 학술논문

“三道防线”中的继电保护与稳定控制之间缺乏协调配合为电网安全运行埋下隐患，为了协调二者之间的动作行为，从三方面进行了研究：改进了距离保护的动作特性，通过调整动作区和增加不平衡辅助判据提高了距离保护的耐过负荷能力；改进线路保护过负荷判据，利用线路温度替代电流来衡量线路的过负荷程度，利用线路热惯性延长过负荷下保护的动作时间，为安稳装置采取措施提供时间；提出了一种过负荷下继电保护与稳定控制的协调策略，通过设置区域保护实现继电保护与稳定控制之间的信息交换，及时采取控制措施，可以有效防止事故扩大，保证系统安全稳定运行。ADPSS仿真结果验证了该方案的正确性和有效性。
“삼도방선”중적계전보호여은정공제지간결핍협조배합위전망안전운행매하은환，위료협조이자지간적동작행위，종삼방면진행료연구：개진료거리보호적동작특성，통과조정동작구화증가불평형보조판거제고료거리보호적내과부하능력；개진선로보호과부하판거，이용선로온도체대전류래형량선로적과부하정도，이용선로열관성연장과부하하보호적동작시간，위안은장치채취조시제공시간；제출료일충과부하하계전보호여은정공제적협조책략，통과설치구역보호실현계전보호여은정공제지간적신식교환，급시채취공제조시，가이유효방지사고확대，보증계통안전은정운행。ADPSS방진결과험증료해방안적정학성화유효성。
Lack of coordination among the relay protection and stability control in“three lines of defense”will create risk for power network safe operation. To coordinate relay protection and stability control, research work in three respects were done in this paper. Firstly, operation zones of distance protections were adjusted and unbalance auxiliary criterion was used to improve the characteristics of distance protection. Secondly, overload criterion of transmission lines were improved and temperatures of lines, instead of currents ,were used to measure overload degree. According to heat capacity of transmission lines, action time of backup protection was prolonged in overload condition. Thirdly, a control strategy coordinating relay protection and stability control were proposed through expanding protection functions. Through coordination control of relay protection and stability control, the cascading of the faults can be prevented. Advanced Digital Power System Simulator(ADPSS)simulation results verified the correctness and effectiveness of the proposed scheme.