计及变频器频率及电压调节暂态过程的异步化同步发电机变结构励磁控制

ASG variable structure excitation control considering converter frequency and voltage adjusting

在考虑变频器的频率和电压调节暂态过程的情况下建立了异步化同步发电机ASG(Asyn鄄chronizedSynchronousGenerator)的暂态数学模型,采用改进的变结构控制方法,设计了ASG的变结构励磁控制系统。在ASG单机对无穷大系统上进行计算机仿真,并与常规的变结构励磁控制比较,结果表明,改进的变结构励磁控制系统不但能迅速减小各变量的变化值,改善系统的动态特性,使系统达到新的稳定状态,同时能有效地消除控制过程中产生的抖振现象,具有一定的优越性。

A transient mathematical model of ASG(Asynchronized Synchronous Generator) is es-tablished,which considers the transient process of converter frequency and voltage adjusting. An excitation control system based on improved variable structure control scheme is designed for ASG. It is simulated in a single-ASG infinite-bus system and compared with conventional control methods. Results show that the proposed control system decreases the variations of variables rapidly,improves the system dynamic performance to reach a new stable state,and effectively suppress the vibration during control.