电力系统保护与控制2024，Vol.52Issue(22)：73-81,9.DOI:10.19783/j.cnki.pspc.240426
弱电网下VSG-DFIG暂态功角稳定性分析及优化策略
Transient power angle stability analysis and optimization strategy of a VSG-DFIG in a weak power grid
摘要
Abstract
The voltage-source doubly-fed induction generator(DFIG),controlled by the typical grid-forming control method of a virtual synchronous generator(VSG),can provide damping and inertia to the power grid.However,during voltage dip faults,they may encounter similar power angle stability issues to those experienced by synchronous machines.First,the impact of grid-side converter power and variable power reference on transient power angle stability using the equal-area criterion when the grid voltage experiences a three-phase symmetrical voltage dip are analyzed.To adapt the variable power reference control strategy to the dynamic changes of the grid-side converter during the transient period,a stability optimization method for a VSG-controlled DFIG(VSG-DFIG)based on transient power angle feedforward is proposed.The method compensates for the imbalance torque of the VSG by feeding forward the power angle deviation,thus accelerating the deceleration process after the power angle passes the equilibrium point during the transient period.The selection range of the feedforward coefficient is determined by the acceleration and deceleration areas of the transient power angle curve,ensuring that the power angle converges while maintaining the fault ride-through capability of the voltage-source control.Finally,the correctness of the theoretical analysis and the effectiveness of the optimization method are verified through simulation and a hardware-in-the-loop experimental platform.关键词
电压源型控制/双馈风电机组/虚拟同步机控制/等面积定则/暂态功角前馈Key words
voltage-source control/doubly-fed induction generator/virtual synchronous generator control/equal area criterion/transient power angle feedforward引用本文复制引用
张澳,王鑫达,张学广..弱电网下VSG-DFIG暂态功角稳定性分析及优化策略[J].电力系统保护与控制,2024,52(22):73-81,9.基金项目
This work is supported by the National Natural Science Foundation of China(No.51977046). 国家自然科学基金项目资助(51977046) （No.51977046）
