汽轮发电机调速系统附加H_∞鲁棒分散控制

ADDITIONAL H_∞ ROBUST DECENTRALIZED CONTROL OF GOVERNOR SYSTEM IN TURBO GENERATOR

利用 H∞ 控制理论的干扰抑制方法提出一种汽轮发电机调速系统附加鲁棒分散控制( GAHDC)策略。理论分析表明 :通过提取发电机输出有功功率波动 (ΔPe)的变化量 ,使 GAHDC只对故障后的功率振荡有抑制作用 ;利用 ΔPe作为输入扰动变量 ,避免了发电机方程的非线性问题 ;GAHDC只包含发电机调速系统的参数 ,与发电机的运行状态以及系统参数无关 ;在多机系统中 ,GAHDC不会对其他发电机的稳定性有危害作用 ,即 GAHDC不存在参数协调和安装地点选择问题。3机和无穷大系统的三相短路仿真实验结果说明 :故障后不稳定的系统在 GAHDC作用下成为稳定 ;在惯性时间常数大的发电机上安装 GAHDC,抑制振荡的速度较快 ;当系统中所有发电机都装设 GAHDC时 ,故障后系统中功率振荡持续的时间是最少的。GAHDC实现了发电机的分散稳定控制。

A kind of governor additional H ∞ robust decentralized control(GAHDC)is proposed based on restraining disturbance method of H ∞ control theory.The result of theoretical analysis shows that the non-linearity is avoided by using the output active power disturbance as input in governor additional controller.The control law of GAHDC is only composed of parameter of generator governing system and has nothing to do with generator operation condition and power system parameter.GAHDC will not do harm to the stability of other generators in multi-machine system.The problem of coordinating parameter and selecting generator for adopting GAHDC does not exist.Results of simulating test of three-phase short circuit in three-machine and an infinite systems show that an unstable system after fault will be stable when adopting GAHDC.It will be more quickly for restraining oscillation when the generator with large inertia time constant adopts GAHDC.The decentralized stability control of generator is realized by GAHDC.