Although renewable energy sources controlled by virtual synchronous generator(VSG)could enhance the inertia and frequency stability of the power grid,they may inherit the low-frequency oscilla-tion problem similar to synchronous generator.To address this issue,the Phillips-Heffron model suitable for VSG was constructed at first based on the linearized model of single VSG connected to the grid,and the induction mechanism of low-frequency oscillation of VSG was explored by the damping torque meth-od.Furthermore,a virtual power system stabilizer(VPSS)integrated into the reactive power link of VSG was proposed,and the control structure and parameter design process based on phase compensation meth-od were given.The research results show that low-frequency oscillation of VSG was caused by the nega-tive damping torque of electromechanical oscillation circuit of VSG generated by the oscillation signal of virtual power angle through the virtual excitation regulator after system disturbed.The low-frequency os-cillation of VSG at 0.1-3 Hz could be suppressed effectively after VPSS integrated into the system with-out the oscillation frequency was affected.
关键词
虚拟同步发电机/虚拟电力系统稳定器/低频振荡/阻尼转矩分析/相位补偿法
Key words
virtual synchronous generator/virtual power system stabilizer/low-frequency oscillation/damping torque analysis/phase compensation method
维普
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