虚拟同步发电机输出阻抗建模与弱电网适应性研究

发布时间：2018-05-13 09:46

本文选题：虚拟同步发电机 + 弱电网　；参考：《电力自动化设备》2017年12期

【摘要】：研究了弱电网条件下虚拟同步发电机-电网互联系统的交互稳定性。在考虑主电路参数、控制参数等因素影响的基础上,提出一种dq旋转坐标系下虚拟同步发电机的输出阻抗模型,并推导其解析表达式。分析了该输出阻抗的频率特性,得出虚拟同步机在弱电网下运行易失稳的结论。基于广义奈奎斯特判据研究电网强度及功率环控制参数对虚拟同步机运行稳定性的影响,以此为依据提出一种基于增大有功环参数的虚拟同步机致稳控制方法,从而提高其弱电网运行的适应性。基于RTDS的硬件在环仿真平台进行仿真计算,验证了理论分析的正确性。
[Abstract]:In this paper, the interaction stability of virtual synchronous generator-power network interconnection system under weak current network is studied. Based on the influence of main circuit parameters and control parameters, an output impedance model of virtual synchronous generator in dq rotating coordinate system is proposed and its analytical expression is derived. The frequency characteristic of the output impedance is analyzed, and the conclusion that the virtual synchronous machine is unstable under the weak electric network is obtained. Based on the generalized Nyquist criterion, the influence of power loop control parameters on the stability of virtual synchronous machine is studied. Based on this, a virtual synchronous machine stability control method based on increasing active power loop parameters is proposed. In order to improve the adaptability of its weak grid operation. The simulation of hardware in loop simulation platform based on RTDS verifies the correctness of the theoretical analysis.
【作者单位】：上海交通大学风力发电研究中心;
【分类号】：TM31;TM732

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