基于饱和参数和混沌搜索算法的同步发电机组励磁分阶段优化控制方法

A Phased Optimization Control Method for Synchronous Generator Excitation Based on Saturation Parameters and Chaotic Search Algorithm

为了令同步电机励磁控制效果更加优秀,提出基于饱和参数和混沌搜索算法的同步发电机组励磁分阶段优化控制方法。建立饱和状态下同步发电机数学模型,使用模糊PID控制器进行励磁控制,整个同步发电机组的励磁控制分为控制阶段和优化阶段,在控制阶段,PID控制器输入变量为同步电机实际电压和目标电压之间的偏差,输出励磁控制量,作用于同步发电机,并通过模糊推理器对输入、输出变量进行模糊处理,实现同步发电机组励磁控制;在优化阶段,为保证模糊PID的控制效果,选择混沌搜索算法优化模糊PID中不同控制参数的隶属度函数划分,通过在混沌空间内生成多组混沌变量,映射在求解空间中寻找最佳的模糊PID隶属度划分结果,使同步发电机的励磁控制效果达到最好。通过实验可以看出,该方法能够高效完成同步发电机的励磁控制,同步发电机的机端电压由起动到平稳运行的变化幅度小,在平稳运行后能够保证电压长期处于一个相对稳定的状态,并且在非饱和以及饱和参数的情况下调整的速度都十分迅速,并且可以保持平稳运行。

In order to improve the excitation control effect of synchronous motors,a phased optimization control method for synchronous generator excitation based on saturation parameters and chaotic search algorithm was proposed.Based on the mathematical model of the synchronous generator in a saturated state,a fuzzy PID controller was used to control the excitation of the synchronous generator.The excitation control of the entire synchronous generator unit was divided into a control stage and an optimization stage.In the control stage,the deviation and deviation change rate between the synchronous motor voltage and the target voltage were used as input variables of the PID controller,and the excitation control quantity was output to act on the synchronous generator.The input fuzzy processing of output variables to achieve excitation control of synchronous generator units;In the optimization stage,in order to ensure the control effect of the fuzzy PID,the chaos search algorithm was selected to optimize the membership function division of different control parameters in the fuzzy PID.By generating multiple sets of chaotic variables in the chaotic space and mapping them to the solution space,the optimal membership division result of the fuzzy PID was searched for to achieve the best excitation control effect of the synchronous generator.Through experiments,it can be seen that this method can efficiently complete the excitation control of synchronous generators.The change in terminal voltage of synchronous generators from startup to stable operation is small,and after stable operation,the voltage can be guaranteed to be in a relatively stable state for a long time.The speed of adjustment is very fast in the case of non saturation and saturation parameters,and stable operation can be maintained.