一次调频与动态稳定协调优化

Optimal coordination between primary frequency regulation and dynamic stability

汽轮机调速系统参数设置过于追求一次调频性能会引发电网的低频功率振荡现象,通过调节调速系统参数可实现一次调频性能与动态稳定性的协调优化。运用稳定裕度和上升时间的倒数形成系统动态稳定性与一次调频的综合评价指标,在设置合理参数范围的情况下,引入基于P系统的粒子群优化(P-PSO)算法求取最佳评价指标,实现对汽轮机数字电液控制系统的参数优化。时域仿真结果表明,经过协调优化的数字电液控制系统参数既可以保证一次调频性能,又能够确保电力系统动态稳定性。

The improper parameter setting of steam turbine governing system for emphasizing the performance of primary frequency regulation may cause low frequency oscillation of power grid while the optimal coordination between primary frequency regulation and dynamic stability can he achieved by the proper parameter adjustment. The comprehensive evaluation index of system dynamic stability and primary frequency regulation is formed by the stability margin and the reciprocal of rise time and the P-PSO （Particle Swarm Optimization algorithm based on P system） is applied to obtain the optimal evaluation index within the rational parameter range for the parameter optimization of steam turbine DEH （Digital Electro-Hydraulic） control system. The results of time-domain simulation show that,the optimized DEH parameters ensure both the performance of primary frequency regulation and the dynamic stability of power system.