1.School of Automation, Guangdong University of Technology, Guangzhou510006, China;2.School of Electrical Engineering, Southeast University, Nanjing210096, China;3.State Grid Henan Jiaozuo Electric Power Supply Company, Jiaozuo454000, China
The increasing frequency of extreme meteorological disasters is posing a great threat to the safe and stable operation of power grid. The traditional economic dispatch method of power system aims at pursuing the economics of the generation costs, while ignoring the load distribution condition of power grid. The outage of heavy or full load lines will lead to the cascading failure and the blackout of power system. To solve this problem, a blackout-prevention economic dispatch method considering load rate homogeneity of power grid and N-1 security constraints is proposed for extreme whether conditions. Based on the traditional economic dispatch model, and comprehensively considering the load rate distribution of the whole power grid and the transmission lines affected by extreme weather, the load rate distribution balance is improved by reducing the average absolute deviation of the load rate of the entire power grid and the load rate of transmission lines in extreme weather areas, the operation security of power system is consequently enhanced. To ensure the robustness and high solving efficiency of the model in extreme weather, a novel method for dynamically checking and adding N-1 security constraints of transmission lines is proposed based on a check-feed-back-check idea and the line outage distribution factor (LODF) of transmission lines. Finally, a reliability evaluation method for dispatch strategies of power system in typhoon disaster is proposed based on the existing cascading failure simulation model considering hidden failures. Simulation results of IEEE RTS-79 test system show that, compared with the traditional economic dispatch method, the proposed dispatch method can effectively increase the load rate homogeneity of power grid, and improve the blackout distribution of the power system under extreme whether condition, thus improving the system operation safety and reliability.
|||黄丽平,王逸飞,郭俊韬,等.考虑电网载荷均衡度及N -1安全约束的防灾经济调度[J].电力系统自动化,2020,44(13):56-63. DOI:10.7500/AEPS20190923003.|
HUANG Liping, WANG Yifei, GUO Juntao, et al. Economic Dispatch for Disaster Prevention Considering Load Rate Homogeneity of Power Grid and N -1 Security Constraints[J]. Automation of Electric Power Systems, 2020, 44(13):56-63. DOI:10.7500/AEPS20190923003.