应用SVG提升交直流混联电网电压稳定性研究

Research on Using SVG to Improve the Voltage Stability of AC-DC Hybrid Power Grid

我国能源资源与负荷中心呈逆向分布的特点,电能需远距离输送至负荷中心。随着高压直流输电技术(HVDC)的快速发展,我国逐步形成多个典型的交直流混联大型受端电网,严重交直流故障可能导致系统电压崩溃。为此研究了SVG提升交直流混联系统电压稳定性的作用机制,提出了相应控制策略,并结合广东电网验证了SVG的应用效果。研究结果表明,通过在输电断面的关键节点安装SVG,可大大提升系统电压稳定性。

China′s energy resources and load centers are in reverse distribution,and the electric energy needs to be transmitted to the load centers in a long distance.With the rapid development of high-voltage direct current(HVDC)transmission technology,China has gradually formed a number of typical AC-DC hybrid large-scale receiving power grid.The serious AC-DC fault may lead to system voltage collapse.The mechanism of applying SVG to improve the voltage stability of AC-DC hybrid power grid was studied,and the corresponding control strategy were proposed.The application effect of SVG combined with Guangdong power grid was validated.The results showed that the voltage stability of the system could be greatly improved by installing SVG at the key nodes of the transmission section.