CAJ | 학술논문

大容量直流闭锁引起的送端暂态过电压可能影响近区风电的稳定运行,针对计及该过电压时直流闭锁控制问题,首先,研究了直流闭锁引起的暂态过电压过程,分析了交直流运行方式对过电压水平的影响;其次,依据电网实际案例分析极控切滤波器和安控切机动作时序,揭示了二者时序配合不当则可能引起"二次压升"的潜在风险;最后,提出了直流闭锁送端暂态过电压运行分析原则和协调控制方法,并以某特高压直流典型方式为算例对所提方法进行验证.研究结果证明了所提方法的有效性.
대용량직류폐쇄인기적송단잠태과전압가능영향근구풍전적은정운행,침대계급해과전압시직류폐쇄공제문제,수선,연구료직류폐쇄인기적잠태과전압과정,분석료교직류운행방식대과전압수평적영향;기차,의거전망실제안례분석겁공절려파기화안공절궤동작시서,게시료이자시서배합불당칙가능인기"이차압승"적잠재풍험;최후,제출료직류폐쇄송단잠태과전압운행분석원칙화협조공제방법,병이모특고압직류전형방식위산례대소제방법진행험증.연구결과증명료소제방법적유효성.
Transient overvoltage caused by DC blocking may pose certain influence to stability of wind plants nearby. To study control strategy of DC system block under overvoltage, firstly, course of transient overvoltage is studied, and effect of AC system and DC system operation modes on overvoltage level is analyzed. Secondly, action sequence of generator shedding by stability control system and filters switched-off by pole control system is studied based on an actual case, and potential risk of secondary overvoltage caused by unmatched action sequence is revealed. Finally, analytical principle of transient overvoltage problem under DC block on rectifier side and corresponding coordinated control strategy are proposed. An ultra-high-voltage direct current (UHVDC) system is studied as an example to verify validity of the strategy.