一种特高压逆变站的等效功率模型

An Equivalent Power Model of the UHV Inverter Station

特高压直流换流站的功率模型影响着大电网机电过程仿真的准确性,进而影响着大电网的安全稳定运行。现有的电磁暂态模型过于复杂,而准稳态模型以及稳态模型显得粗糙。因此,建立详略得当的换流站功率模型极为重要。在特高压直流系统的运行机理与功率输出特性分析的基础上,提出了一种等效功率模型。对模型参数分类后,提出了模型参数的获取策略。最后结合不同故障类型下逆变站功率相应的特点,采用详细电磁的仿真波形,对敏感参数进行了参数拟合和校核,并通过建立简化模型验证了模型及获取参数的正确性。

The power model of the UHVDC converter station affects the accuracy of electromechanical process simulation,and then affects the safe and stable operation of the large power grid. However, the existing electromechanical simulation process is too complex,and the quasi-steady state model and the steady state model are rather rough,thus it is very important to establish a reasonably detailed power model of the converter station. Based on the analysis of the operation mechanism and power output characteristics of the UHVDC System,an equivalent power model is proposed in this paper.The acquisition strategy of the parameters is proposed after the model parameters are classified. Finally, according to the corresponding characteristics of the inverter station power under different types of faults,the sensitive parameters are fitted and checked by the detailed electromagnetic simulation waveform,and the correctness of the model and parameters obtained is verified by a simplified model established.