CHEN Zhong,ZHU Zhengguang,YAN Jun.Security correction strategy of AC/DC hybrid system based onsecurity distance sensitivity[J].Electric Power Automation Equipment,2019,39(09):144-150.
CHEN Zhong,ZHU Zhengguang,YAN Jun.Security correction strategy of AC/DC hybrid system based onsecurity distance sensitivity[J].Electric Power Automation Equipment,2019,39(09):144-150.DOI: 10.16081/j.epae.201909020.
Security correction strategy of AC/DC hybrid system based onsecurity distance sensitivity
In the large-scale AC/DC hybrid system,the dynamic characteristics of AC/DC hybrid power grid have been fundamentally changed due to the large capacity,flexible and controllable characteristics of the DC system,and the difficulty of operation and control has increased sharply. The large-scale transfer of power flow after DC blocking will seriously affect the stable operation of the system. It is urgent to study the security correction strategy of AC/DC hybrid system. Therefore,a safety correction method for AC/DC hybrid system based on steady-state security distance sensitivity is proposed. Based on the steady-state security region theory of AC/DC hybrid system,in order to meet the requirements of online calculation of power system,the linear fitting of the security region boundary surface is performed and the calculation method of security distance and its sensitivity are given. The control cost of different dimensional variables is characterized by the expansion and contraction of the security region,on this basis,the security correction guidance vector is obtained. According to the sensitivity of each control variable to the guidance vector and the actual adjustment ability of each control variable,it is sorted and substituted into the security correction model to minimize the total adjustment during the regulation process. Based on the analysis and calculation of the modified IEEE 39-bus AC/DC hybrid system and the simplified actual power grid,the correctness and effectiveness of the proposed security correction strategy are verified.
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