CAJ | 학술논문

直流系统送端采用孤岛运行方式，可减少直流系统故障对主网的影响，提高电网安全稳定水平，增加输电通道外送能力。云广直流孤岛系统由于小湾、金安桥电厂远离楚雄换流站，存在动态稳定问题。现有电力系统稳定器(PSS)可有效提高小湾机组对金安桥机组相对振荡模式的阻尼，但对孤岛系统的过电压控制产生了不利影响。文中从PSS的原理上对原因进行了分析，并提出了采用广域信号的PSS解决方案。基于机组转速差的广域PSS在改善孤岛系统动态稳定性的同时，消除了对过电压控制的不利影响，在云广直流孤岛系统中具有良好的实施可行性。仿真结果验证了广域PSS的有效性。
직류계통송단채용고도운행방식，가감소직류계통고장대주망적영향，제고전망안전은정수평，증가수전통도외송능력。운엄직류고도계통유우소만、금안교전엄원리초웅환류참，존재동태은정문제。현유전력계통은정기(PSS)가유효제고소만궤조대금안교궤조상대진탕모식적조니，단대고도계통적과전압공제산생료불리영향。문중종PSS적원리상대원인진행료분석，병제출료채용엄역신호적PSS해결방안。기우궤조전속차적엄역PSS재개선고도계통동태은정성적동시，소제료대과전압공제적불리영향，재운엄직류고도계통중구유량호적실시가행성。방진결과험증료엄역PSS적유효성。
Islanded operation of the DC sending system can reduce the impact of DC fault on the main system,thus enhancing the security of the system and increasing the capacity of the transmission corridor.In the islanded sending system of Yunnan-Guangdong DC transmission system,there are dynamic stability problems because the Xiaowan plant and Jin”anqiao plant are far away from Chuxiong converter station.The conventional power system stabilizer(PSS)effectively increases the damping of the oscillation mode between Xiaowan generators and Jin”anqiao generators,but exerts an adverse impact on the overvoltage control of the islanded system.This paper analyzes the cause according to the principle of the conventional PSS,then proposes a solution scheme using wide-area signals based PSS.The wide-area PSS based on the speed difference of generators can improve the dynamic stability of the islanded system,while avoiding the adverse impact on the overvoltage control.It has good feasibility in the islanded Yunnan-Guangdong DC sending system.The effectiveness of wide-area PSS is verified by simulation results.