考虑调频死区的二次调频控制回路设计

发电机组的一次调频控制回路中由于数字电液调节系统与机械液压调节系统的并存，使得本应发挥高灵敏度作用的DEH调节系统中设置了和机械液压机组相同的调频死区。考虑到调频死区这一非线性环节的存在使二次调频回路中控制器的受控对象发生了改变，因此需要用相应的非线性控制的方法来选择二次调频控制回路中的PI控制器的参数。该文研究了调频死区对二次调频回路中的PI控制器的受控对象特性的影响，用Popov稳定判据作为选择PI参数使系统稳定的数学工具，讨论了PI参数的变化对系统频率控制质量的影响。

THE DESIGN OF SECONDARY FREQENCY REGULATION LOOP CONSIDERING REGUALTION DEAD BAND

In China, Digital electro-hydraulic (DEH) and Mechanical hydraulic control(MHC) exist together in primary frequency regulation loop in power system, so the DEH systems with high sensitivity has been placed dead bands as the same as MHC system. Considering dead band is a nonlinear part which makes the controlled objects changing, the PI controller parameters should be set by the method of nonlinear control. The influence of dead band on objects controlled by PI controller in secondary frequency regulation loop are analyzed in this paper. The Popov stability criterion has been used as the mathematical tool to select the PI parameters. At last, the influence of PI parameter deviation on frequency in electric power system is discussed.