孤网模式下,水电机组调速系统的参数设置不合理会造成频率振荡,从而影响电网可靠运行,因此有必要对调速系统参数与孤网频率稳定性之间的关系进行研究。为此,针对孤网运行的西南某水电机组的实际情况建立了孤网系统模型,并成功仿真出真实存在的频率振荡现象。在此基础上,通过深入分析调速系统人工频率死区、永态转差系数和控制参数对孤网频率稳定性的影响,提出了参数配置建议,并用PSD-BPA软件进行了验证。结果表明,合理配置调速系统参数能显著提高水电机组对孤网频率的控制能力,增强孤网系统的稳定性。 Under the isolated grid mode, the parameter setting of hydropower turbine speed regulation system will cause the frequency oscillation, which will affect the reliable operation of the power grid. Therefore, it is necessary to study the relationship between the speed regulation system parameters and the isolation grid frequency stability. For this reason, a model of isolated grid system is established for the actual situation of a hydropower unit in the southwest of China. The real-time frequency oscillation phenomenon is successfully simulated. On this basis, through the in-depth analysis of the effect of artificial frequency dead zone, permanent slip coefficient and control parameters on the frequency stability of the isolated grid, the proposed parameter configuration is proposed and verified by PSD-BPA software. The results show that the rational allocation of speed governing system parameters can significantly improve the control ability of hydropower units on the frequency of isolated grids and enhance the stability of isolated grid system.