大容量多馈入直流对广东电网运行稳定性影响的研究

针对广东电网的结构特点,研究了直流通道故障对广东电网安全稳定性的影响。首先,通过对广东电网各直流逆变站的短路比计算,分析了广东电网作为直流受端系统的强度;其次,通过对发生单重和多重故障时的暂态稳定计算,研究了作为多回直流受端系统的广东电网在发生直流双极闭锁故障时的运行稳定性问题。分析认为:广东电网属于强系统,电网的主要稳定问题是暂态电压问题。提出装设动态无功补偿装置、紧急切除线路高抗、保留直流故障线路处电容器组等策略以提高受端电网的电压稳定性。

Research on Impacts of Multi-infeed HVDC on Stability of Guangdong Power Grid

In light of the structural features of Guangdong power grid, the impacts of DC channel fault on the safety and stability of Guangdong power grid are studied. First, through calculating the short circuit ratios of inverter stations in Guangdong power grid, the stability strength of Guangdong power grid as a DC receiving-end is researched. Second, by means of the transient stability calculation for single and multiple faults, the stability of Guangdong power grid as a multiinfeed AC/DC power system is studied. It is concluded upon analysis that transient voltage is the main stability problem of the strong Guangdong power system. Tactics such as installing dynamic reactive power compensation devices, immediately removing high impedance of line, retaining capacitor banks at DC fault lines are proposed to enhance the grid voltage stability of receiving-end.