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.
出处
《电力自动化设备》
EI
CSCD
北大核心
2014年第10期86-91,共6页
Electric Power Automation Equipment
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
DC power transmission
sensitivity analysis
trajectory
emergency DC power support
electric generators
excitation control
blocking
stability
