计及功率控制型构网变流器接入的交流系统暂态稳定性仿真研究

Simulation study on transient stability of AC systems considering the connected power-controlled grid-forming converters

为研究功率控制型构网变流器接入交流系统后的暂态稳定性演化趋势,基于IEEE 39节点交流测试系统,将发电机分别等容量替换为功率控制型构网变流器与跟网型变流器,并改变其在交流系统中接入数量、并网位置进行电磁暂态仿真,结果表明:功率控制型构网变流器对接入区域的暂态稳定性提升能力更优,尤其当所替换发电机相邻时,提升效果显著;随着功率控制型构网变流器接入系统比例增加,系统暂态稳定性越强;功率控制型构网变流器内部等效惯性系数越大,系统同步稳定性越弱,其内部阻尼系数越大,系统同步稳定性越强。

To investigate the evolution trend of transient stability of power-controlled grid-forming(GFM)converters connected to AC systems,generators are replaced with power-controlled grid-forming(GFM)converters and gridfollowing(GFL)converters of equal capacity using the IEEE 39-bus AC test system.Additionally,the number of connections and integration positions in the AC system are varied for electromagnetic transient simulations.The results indicate that power-controlled grid-forming converters exhibit superior transient stability enhancement capabilities in the integration area,especially when the replaced generators are adjacent.As the proportion of such converters in the system increases,the system’s transient stability strengthens.Furthermore,higher equivalent inertia coefficients within power-controlled GFM converters lead to weaker synchronous stability of the system,whereas higher internal damping coefficients enhance synchronous stability.