CAJ | 학술논문

随着越来越多的直流输电线路投运，交直流系统连锁故障的研究变得非常迫切。提出了一种基于改进 OPA模型的交直流系统连锁故障模型。该模型考虑100 Hz 谐波保护等直流系统保护装置，模拟了交直流系统的调度环节，可分析交直流系统之间的故障传播过程以及直流系统可控性对停电风险的影响。该模型使用直流系统的等效导纳参数计算短路电压，避免了详细的时域仿真，提高了计算效率。对IEEE 30节点和河南电网系统进行了仿真。结果表明，在没有远距离输电的情况下，纯直流和交直流互联系统的停电风险高于纯交流互联方式的系统。但由于直流系统具有良好的调节能力，纯直流互联方式系统的停电风险在调度环节的恰当作用下可以显著降低。
수착월래월다적직류수전선로투운，교직류계통련쇄고장적연구변득비상박절。제출료일충기우개진 OPA모형적교직류계통련쇄고장모형。해모형고필100 Hz 해파보호등직류계통보호장치，모의료교직류계통적조도배절，가분석교직류계통지간적고장전파과정이급직류계통가공성대정전풍험적영향。해모형사용직류계통적등효도납삼수계산단로전압，피면료상세적시역방진，제고료계산효솔。대IEEE 30절점화하남전망계통진행료방진。결과표명，재몰유원거리수전적정황하，순직류화교직류호련계통적정전풍험고우순교류호련방식적계통。단유우직류계통구유량호적조절능력，순직류호련방식계통적정전풍험재조도배절적흡당작용하가이현저강저。
With the ever-increasing DC transmission lines,research on cascading failures of the AC-DC system is becoming very urgent.A cascading failure model for the AC-DC system based on the improved OPA model is proposed.With dispatching and the main protection devices such as 100 Hz harmonic protection devices taken into account,it is possible to analyze the failure propagation process in the AC-DC system and the impact of DC system controllability on blackout risk.This model uses equivalent admittance parameter of DC system to calculate the short-circuit voltage,thus avoiding detailed time-domain simulation and significantly improving computational efficiency.Simulations are performed on a revised IEEE 30-bus system and Henan power grid.The results show that blackout risk of DC and AC-DC interconnected systems are higher than that of AC interconnected system with no long distance power transmission.Because of the good regulating ability of the DC system, the blackout risk of DC interconnected system can be appreciably reduced by appropriate impact of the dispatching.