【摘要】 串联补偿是一种提高可再生能源发电站长距离输电能力的常见方案，然而并网逆变器和串联补偿电力线之间的相互作用会带来振荡问题，威胁电力系统的安全运行。为此提出一种无锁相环的扩展模拟阻抗控制策略，在弱电网和高串补度电网中稳定系统。此外，还通过稳定性分析验证该方法的有效性；进行特征值分析，以指导参数设计。最后，通过模拟和实验结果验证了理论分析和所提控制策略的有效性。更多还原

【Abstract】 To increase the long-distance power transmission capacity of renewable energy power stations, series compensation is a common solution. However, oscillation problems are introduced by the interaction between grid-connected inverter and series-compensated power lines, threatening the safe operation of the power system. To address this challenge, an extended impedance-emulating control strategy without the phase-locked loop is proposed, and the proposed method can stabilize the system in weak grids and high series compensation level grids. Besides, the effectiveness of the method is verified by stability analysis. Eigenvalues analysis is performed to guide parameter design. Finally, theoretical analysis and proposed control strategy are validated with simulation and experimental results.更多还原