1.School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha 410114, China;2.Economical and Technical Research Institute of State Grid Hunan Electric Power Co., Ltd., Changsha 410004, China
This work is supported by National Natural Science Foundation of China (No. 51677007) and Hunan Provincial Natural Science Foundation of China (No. 2019JJ40298).
In view of the fact that the traditional continuous power flow method is difficult to adapt to the AC/DC interconnected systems with access of large-scale wind power, this paper proposes a probabilistic continuous power flow calculation method for AC/DC systems with wind power. Based on the frequency regulation characteristics of conventional units and the static characteristics of voltage and frequency of loads, the randomness of wind power output, the DC control mode and the frequency fluctuation deviation constraints are taken into account. Then this paper establishes the probabilistic continuous power flow equation of AC/DC systems with wind power considering the frequency regulation of power sources and static characteristics of voltage and frequency of loads. Based on the Jacobian matrix of the modified equation, the load margin sensitivity index reflecting the frequency fluctuation, wind power output and control mode is derived. The power flow solution and load margin in multiple scenarios of N and N-1 states are obtained by combining Monte Carlo method and predictor-corrector method. The correctness and validity of the proposed method are verified by simulation results of the modified IEEE 39-bus system.
MA Rui,LIU Zhenlei,HE Pingping,et al.Probabilistic Continuous Power Flow Method for AC/DC Systems with Wind Power Considering Frequency Characteristics of Source and Load[J].Automation of Electric Power Systems,2020,44(6):27-36.DOI:10.7500/AEPS20190217002Copy