【摘要】 计及直流系统的动态构建了交直流输电系统的暂态能量函数,直流换流站交流母线电压和发电机转速功角一样作为显式变量出现在暂态能量函数中,暂态能量函数的变量从平衡点到势能边界面出口点的积分路径不作线性假设。视为慢动态的发电机转速和功角,沿着持续故障轨迹或受扰轨迹积分,而视为快动态的直流系统变量的积分路径通过修正后得到,并讨论了应用势能边界面法求取临界能量和临界切除时间的问题。分别利用所提方法和逐步积分的时域仿真法求取了4机和10机交直流输电系统的临界切除时间,通过比较验证了所提方法的有效性。更多还原

【Abstract】 A transient energy function with consideration of DC dynamics is constructed for AC/DC power system.As the generator angular speed and rotor angle,the AC bus voltage at DC converter station is explicitly represented in it.It is not assumed that the variables of the transient energy function would change along a linear path from the stable equilibrium point to the exit point on PEBS(Potential Energy Boundary Surface).The angular speed and rotor angle,treated as slow dynamics,are integrated along sus- tained fault trajectory or disturbance trajectory,but the integral path of the DC dynamics,treated as fast dynamics,are obtained by modification.The application of PEBS method in the calculation of critical energy and critical clearing time are discussed.The critical clearing time is calculated by PEBS method and the time -domain simulation method respectively for 4-machine and 10-machine AC/DC systems,and the results vali- date its effectiveness.更多还原