兼顾电网频率和功角稳定性的柯拉光伏电站低电压穿越关键性能指标优化

Optimization of Key Performance Indicators for LVRT of Kela PV Station Considering Grid Frequency and Power Angle Stability

摘要:

雅砻江柯拉光伏电站是西南电网首座百万千瓦级光伏电站，与木绒水电站构成大容量水光互补系统，其低电压穿越特性对电网频率、功角稳定性均存在一定影响。首先，研究了光伏电站低电压穿越影响电网频率稳定的机理、水光互补系统功角稳定特性，提出了一种量化评估光伏电站低电压穿越影响电网频率的工程实用方法；然后，分析了柯拉光伏电站低电压穿越关键性能指标对西南电网频率、功角稳定性及对负荷中心暂态电压稳定的影响；最后，提出一种兼顾电网频率和功角稳定性的光伏电站低电压穿越关键性能指标优化方法，并通过对柯拉光伏的仿真测试验证了所提方法的有效性。

Abstract:

Kela PV station is the biggest photovoltaic power station in the southwest power grid,which forms a large-capacity hydro-photovoltaic complementary system with Murong hydropower station. Its low voltage ride-through（LVRT） characteristics have an impact on frequency and power angle stability of power grid. Firstly，the mechanism of LVRT of PV station affecting frequency stability of power grid is studied, as well as the power angle stability characteristics of hydro-photovoltaic complementary system. An engineering practical method for quantiatively evaluating the impact of LVRT of PV station on grid frequency is proposed. Then, the impacts of key performance indicators for LVRT of Kela PV station on frequency, power angle stability and transient voltage stability of southwest power grid are analyzed. Finally, an optimization scheme for key performance indicators for LVRT of PV station that takes into account the frequency and power angle stability of power grid is proposed, and the effectiveness of the proposed scheme is verified through simulation testing of Kela PV station.