基于轨迹灵敏度的多回直流紧急功率提升策略  

Emergency power support for multiple DCs based on trajectory sensitivity

作　　者：王兴刚[1] 张虹[1] 徐政[2] 翁华[3] 许烽[2] 

机构地区：[1]云南电网公司,云南昆明650011 [2]浙江大学电气工程学院,浙江杭州310027 [3]国网浙江省电力公司经济技术研究院,浙江杭州310008

出　　处：《电力自动化设备》2014年第10期86-91,共6页Electric Power Automation Equipment

摘　　要：直流闭锁故障后,需要择优选择参与紧急功率提升的直流,为此提出一种基于轨迹灵敏度选择最优直流进行紧急功率提升的方法。首先确定各回直流线路故障后对应的领先机组,然后通过计算提升非故障直流线路功率对稳定性改善的灵敏度确定最优的直流功率提升措施,配合直流送端发电机组励磁控制,可以取得良好的控制效果。利用该方法,进一步给出云电外送5回直流的紧急功率提升策略。仿真计算表明,所提方法可以大幅减少直流闭锁故障后的切机量,显著提高系统稳定水平。A method based on trajectory sensitivity is proposed for the emergency DC power support during DC blocking fault,which determines the corresponding leading generator of faulty DC link,calculates the sensitivity of each healthy DC link to the improvement of system stability by its DC power increase,works out the emergency DC power support strategy by selecting the optimal DC links,and cooperates with the generator excitation control to achieve an excellent control performance. A strategy of emergency DC power support is given for 5 HVDCs of Yunnan Power. Results of simulative calculation show that,the proposed method can greatly reduce the amount of post-fault generator trip and significantly improve the system stability.

关 键 词：直流输电 灵敏度分析 轨迹 直流紧急功率提升 发电机 励磁控制 闭锁 稳定性 

分 类 号：TM721.3[电气工程—电力系统及自动化]