含新能源直流送端电网的电磁暂态仿真建模研究

Research on Modeling and Simulation of Electromagnetic Transients in DC Sending End Grid Containing New Energy

由于机电暂态仿真无法准确反应新能源经直流送出系统的暂态特性,需要建立电磁暂态模型研究送端电网过电压的抑制策略。针对2022年我国西北某省含新能源的直流送端电网,提出了电网PSD-BPA数据到PSCAD/EMTDC模型的建立流程,并解决流程中的电网等值和电厂单机等值问题。仿真结果表明,搭建的含新能源直流送端电网模型的稳态、暂态特性均与PSD-BPA的计算结果一致,验证了提出的电网建模方法的有效性。

Since the electromechanical transient simulation cannot accurately reflect the transient characteristics of new energy via the DC delivery system,an electromagnetic transient model needs to be established to study the overvoltage suppression strategy of DC sending end grid.This paper proposes the establishment process from PSD-BPA grid data to PSCAD/EMTDC model for a DC sending end grid with new energy sources in northwest China in 2022,and solves the grid equivalence and single unit equivalent of power plant issues in the process.The simulation results show that the steady-state and transient characteristics of the constructed model of the DC sending end grid with new energy are consistent with the calculation results of PSD-BPA,which validates the effectiveness of the power grid modeling method in this paper.