摘要
高比例可再生能源接入后,其出力的间歇性和波动性会扩大等效负荷波动,降低电网的安全性。该文基于节点有功功率-线路电流灵敏度分析,考虑节点等效负荷功率波动时空差异,建立概率模型求解各时段因功率波动致线路电流过载的最大概率,利用条件概率求得各节点因功率波动在至少一个时段内导致线路电流过载的概率,得到节点关键性排序,在IEEE-39节点系统上验证该方法的有效性。该方法的辨识结果随系统运行状态的变化而变化,属动态辨识。
When renewable energy has been integrated into power grids in large scale,it will aggravate the fluctuation of equivalent loads,confront the security and stability of power system with a great challenge.Based on line current sensitivity analysis,as well as considering the time-space difference of equivalent load fluctuation,the probabilities of line current violation caused by node power fluctuation are calculated by the probability model established.Then,conditional probability approach is used to obtain the probabilities of line current violation caused by node power fluctuation during at least one period.Finally,the sequence of critical nodes can be obtained.Case study on the IEEE 39-bus system demonstrates the validity of the method proposed.The identification results of this approach vary with the system states,so it belongs to dynamic identification.
作者
孙伟卿
叶磊
韩冬
王承民
Sun Weiqing;Ye Lei;Han Dong;Wang Chengmin(School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2020年第9期139-146,共8页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51407117)。
关键词
可再生能源
灵敏度分析
电力系统安全
等效负荷功率波动
关键节点辨识
renewable energy resources
sensitivity analysis
electric power system security
equivalent load power fluctuation
critical node identification
