基于系统加速能量的切机控制措施量化研究

Quantitative Research of Generation Capacity Tripped Based on Acceleration Energy of Power System

进行暂态稳定紧急控制时,首先需要确定合理的切机量。从发电机转子运动方程出发,定义并分析系统加速能量在系统稳定运行状态、故障切除时刻以及采取控制措施时刻的特性,指出等面积准则是系统加速能量在特定条件下的表达形式。在此基础上,推导在临界切机量时系统加速能量所满足的特性方程,提出一种基于系统加速能量的临界切机量求取方法。与基于等面积法则的传统方法不同,所提方法不需要计算系统的不稳定平衡点,积分路径拟合及积分计算过程简单。仿真结果表明,所提方法具有良好的应用前景。

Estimating the generation capacity to be tripped suitably is a pre-preparation for power system transient stability emergency control. With the equations of motion of a generator, this paper defined and analyzed the acceleration energy of power system during the steady state, the fault clearing time and the moment of control actions taken, and then it indicated that the equal-area criterion was a special case of acceleration energy of power system. Based on the detailed analysis of acceleration energy of power system, a method to estimate generation critical capacity tripped was presented. Different from the equal-area criterion, this method don’t need to calculate the unstable equilibrium points, integral path determined and calculation process are simple. The simulation results show that had good prospects.