The virtual resistance(VR)scheme can effectively suppress the synchronous resonance(SR)during virtual synchronous generator(VSG)grid-connection,but it will deteriorate the system transient stability performance,especially among high-voltage lines,larger line inductance will further exacerbate its deterioration.In response to the above contra-dictions,firstly,the power-virtual power angle curve is plotted based on power flow model,then the transient stability of VSG is described quantitatively by maximum power angle overshoot,total deceleration area and minimum initial power angle.Thereafter,with the goal of increasing the maximum power angle overshoot and total deceleration area,it is pro-posed to improve the transient stability of the system by reducing the equivalent active power reference and increasing the equivalent reactive power reference in the event of voltage sag fault,and a combination of adjustment coefficients in the stability domain is provided at the same time.Finally,a simulation model is built on the Matlab/Simulink platform.The results show that when the inherent large line inductance of the high-voltage lines and the VR is taken into account,the improved VSG control strategy can significantly enhance the transient stability performance of the system,and has a good application prospect.
关键词
虚拟同步发电机(VSG)/虚拟电阻(VR)/功角暂态稳定判据/同步振荡(SR)/视在功率
Key words
virtual synchronous generator(VSG)/virtual resistance(VR)/power angle transient stability criterion/syn-chronous resonance(SR)/apparent power
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