基于直流电网的异步发电系统控制策略

Control Strategy of Asynchronous Generation System Based on DC Grids

针对异步直流发电中变转速控制与变转矩控制相结合的新颖综合控制模式,介绍其发电系统的结构、变转速模式特性、转速寻优策略和转矩控制特性并给出具体方法。以柴油机组万有特性为着眼点,提出分级阶跃变转速策略和控制程序流程,通过Matlab/simulink搭建系统模型进行仿真试验以验证变速控制策略的正确性;以异步发电机和变换器为对象,提出基于直接转矩控制策略(DTC)的转矩控制模式,以实现单机直流电压的稳定;最终通过小比例试验验证转矩控制模式实现的可行性。

Targeting at the novel integrated control mode combining variable speed control and variable torque control in asynchronous DC power generation, it is introduced that is the structure of the power generation system, the characteristics of variable speed mode, the speed optimization strategy and the specific method is given. The diesel engine universal characteristics as the starting point, it puts forward the step-speed strategy and variable speed control program flow. The system simulation model is built by the Matlab/simulink and verifies the correctness of the control strategy. Taking the asynchronous generator and converter as the object, the torque control mode based on direct torque control strategy（DTC） is proposed to realize the stability of single-unit DC voltage. Finally, the feasibility of the torque control mode is verified by small-scale test.