风力发电系统中直流辅助电源的设计与仿真

为了满足风力发电系统中各监测单元模块对供电系统的需求,设计了一款多输出直流(direct current, DC)辅助开关电源。根据辅助电源参数的具体要求,理论分析并设计了DC-DC高频反激变压器;选用稳压管TL431、光电耦合器PC817以及UC2842控制芯片,实现对输出电压的采集、输入电流的采样以及功率MOS(metal, oxide, semiconductor)管的驱动;搭建了一款输出电压为5、15、24 V的多输出双闭环控制的反激开关电源电路,并利用Saber软件对设计的直流辅助开关电源电路进行了仿真。仿真结果表明:设计的多输出直流辅助开关电源的输出电压、占空比以及开关频率符合设计要求,其值均在设计要求精度的10%以内。可见设计辅助电源电路中所采用的方法简单有效,且电路各元器件参数值的选取合理,其方法和结果可在后续直流辅助电源系统电路的硬件开发中为各元器件参数的优化提供参考依据。

Design and Simulation of DC Auxiliary Power Supply in Wind Power Generation System

In order to meet the demand of each monitoring unit module in wind power generation system, a multi-output DC auxiliary switching power supply is designed. According to the specific requirements of relevant parameters of auxiliary power supply, the DC-DC high-frequency flyback transformer was theoretically analyzed and designed; The voltage regulator TL431, optoelectronic coupler PC817 and UC2842 control chip were selected to realize the collection of output voltage, input current and drive of power MOS tube; A flyback switching power supply circuit with multiple output and double closed-loop control with output voltage of 5 V, 15 V and 24 V was built, and the circuit simulation of the designed DC auxiliary switching power supply was carried out by using Saber software. The simulation results show that the output voltage,duty cycle and switching frequency of the designed multi-output DC auxiliary switching power supply meet the design requirements, and their values are all within 10% of the design accuracy requirements. It is concluded that the method adopted in the design of auxiliary power circuit in this paper is simple and effective, and the selection of the parameter valuesSof each component of the circuit is reasonable, which can provide a reference for the optimization of parameters of each component in the subsequent hardware development of the circuit of the DC auxiliary power system.