电网黑启动过程中的铁磁谐振分析

在电网的黑启动过程中,可能发生的铁磁谐振线性的本质及相应预防措施,文中分析了母线电容对铁磁谐振的影响,给出了铁磁谐振的本质是电容及电感的充放电过程,及补偿电容对非线性电感的助增作用;给出了在黑启动过程为了避免铁磁谐振的发生,应切除补偿电容器,待黑启动过程完成之后再投入相应的电容器的预防措施。电网最佳黑启动路径的铁磁谐振仿真分析结果验证了该文的上述观点及策略。

Analysis of Ferroresonance in Black-start of Power Grid

During the black-start period of power system,the nature of ferroresonance phenomenon that might happen and the related prevention method have not been discussed till now.The effect of bus capacitance on the ferroresonance is analyzed firstly in the paper.And then the nature of the ferroresonance issue is reflected as the charging and discharging process between inductance and capacitance with the enhanced effect of compensation capacitor on nonlinear inductance.In order to avoid the occurrence of ferroresonance during the black-start of power system,the prevention method is proposed by the elimination of the compensation capacitor and then the input of the related capacitor.The simulation results of the ferroresonance in the optimal black-start path of Tianjin power grid demonstrate the effectiveness and validity of the proposed mechanism and prevention methods.