【摘要】 弱电网条件下跟网型并网变流器在组网时易发生谐振，为了使分布式电源接入电网能够不脱网稳定运行，文章提出了基于锁相环补偿的电网电压前馈跟网型VSG谐振抑制方法。首先，对跟网型VSG变流器进行小信号阻抗建模及稳定性分析，为了消除锁相环带来的负阻效应，建立电网电压前馈控制谐振抑制方法；其次，在电网电压前馈的基础上，引入锁相环补偿环节对阻抗进行重塑，并对其进行小信号阻抗建模及稳定性分析；最后，建立基于锁相环补偿的电网电压前馈控制跟网型VSG系统仿真模型并进行仿真测试。测试结果表明，文章所提方法在弱电网下具有较好的鲁棒性能，能提升系统组网稳定性。更多还原

【Abstract】 Under weak power grid conditions, grid connected inverters are prone to resonance during grid-connection. In order to ensure stable operation of distributed power sources connected to grid without disconnection, this article proposes a voltage feed-forward grid connected VSG resonance suppression method based on phase-locked loop compensation. Firstly, small signal impedance modeling and stability analysis are conducted on grid following VSG converter. In order to eliminate negative resistance effect caused by phase-locked loop, a resonance suppression method for grid voltage feed-forward control is established; Secondly, based on grid voltage feedforward, a phase-locked loop compensation link is introduced to reshape the impedance, and small signal impedance modeling and stability analysis are carried out; Finally, simulation model of grid voltage feed-forward control grid following VSG system based on phase-locked loop compensation was established and tested. The test results showed that the proposed method has good robustness performance in weak power grids and can improve the stability of system gridconnected.更多还原