一种解析的暂态能量裕度灵敏度及其应用

摘要

暂态稳定裕度对发电机出力的灵敏度在暂态稳定预防控制中具有重要应用价值。给出了一种解析的暂态能量裕度对发电机出力的灵敏度。采用电力系统结构保留模型，有功负荷采用恒功率模型，无功负荷采用恒阻抗模型，推导得到了暂态能量裕度对发电机出力灵敏度的解析表达式。推导过程中的主要假设条件是所采用的结构保留模型以及故障过程中发电机输出电磁功率不变的假设，无其他近似。得到的灵敏度公式便于计算，可应用于电力系统详细模型。灵敏度的大小可用于指导暂态稳定预防控制。仿真结果验证了灵敏度的准确性及其应用于暂态稳定预防控制的有效性。%The sensitivity of transient stability margin to generator output power plays an important role in transient stability preventive control. An analytical sensitivity of transient energy margin to generator power is derived. The structure preserving model of power systems with constant power active load and constant impedance reactive load is adopted. An analytical formula of the sensitivity of transient energy margin to generator power is derived. There are no other assumptions except the adopted power system model and the assumption that output powers of generators are constant during the fault. The sensitivity is easy to calculate and applicable to power system detailed models. The sensitivities can be used for transient stability preventive control. Simulation results verify the validity of sensitivity and its applicability in transient stability preventive control.