广东交直流混合电网的运行稳定性研究

建立了包含广东220kV及以上电压等级系统和主要互联省网等值系统的详细机电暂态仿真模型,在BPA平台上对2005年处于多回直流馈入交直流混合运行状态的广东电网的运行稳定性问题进行了全面测算和分析.通过计算广东电网的各逆变站在不同运行方式下的短路比分析了广东电网作为直流受端系统的强度.通过负荷中心附近发生单重和多重故障时的暂态稳定计算,分析了多个逆变站同时发生换相失败的可能性及其对广东电网安全稳定性的影响.通过区内外多重故障后果的对比分析,指出了广东电网的薄弱环节,并提出了相应的控制对策.

STUDY ON STABILITY OF GUANGDONG AC/DC HYBRID POWER GRID

A detailed electromechanical transient simulation model including 220kV and above power networks in Guangdong power grid and equivalent systems of main interconnected provincial power networks is built. On BPA platform the stability of Guangdong power grid in 2005, which is situated in hybrid AC/DC operation mode with multi-infeed DC transmission lines, is overall simulated and analyzed. Through calculating the short circuit ratios of inverter stations in Guangdong power grid under various operating modes, the stability strength of Guangdong power grid as a DC receiving end is researched. By means of the transient stability calculation for single and multiple faults occurring nearby the load center the possibility of commutation failure simultaneously appearing in more than one inverter in the Guangdong power grid and its impact on security and stability of Guangdong power grid are analyzed. Through the comparison and analysis on the consequences of multiple faults occurred inside and outside Guangdong power grid, the weak links in Guangdong power grid are pointed out and corresponding control measures are proposed.