无刷双馈风力发电系统电压电流采样设计

Sampling design of voltage and current under brushless doubly fed generation system

为了实现在无刷双馈风力发电系统中,精确、及时地对电压电流信号进行采样,以及解决控制板上各路信号采样电路通用性的问题,采用了直流采样方法。将高速线性光耦HCNR201以被测电路和控制电路电气隔离的方法应用到所设计的采样电路中;通过开展所设计电路的理论分析,建立了电压电流霍尔传感器采集数据与单片机采样数据之间的关系;在理论分析的基础上,在无刷双馈风力发电系统实验平台上进行了试验,得到了电压电流霍尔传感器采集数据与单片机采样数据之间的实际传递函数;最后,对传递函数理论拟合曲线和实际拟合曲线进行了比较。试验结果表明,所设计的无刷双馈风力发电系统电压电流信号检测方法误差小、可靠性强,为下一步研究提供了参考。

In order to realize sampling the voltage and current signals accurately and timely,and solve the problems of the versatility of various signal sampling circuit in the control board,DC sampling was applied,and the method of isolating the tested circuit and the control circuit which using high-speed linear optocoupler HCNR201 was used.Through the theoretical analysis of the designed circuit,the transfer function between the sampled data of voltage and the sampled data of current Hall sensor was created.After the analysis,the experiment was conducted in the brushless doubly fed wind power generation system experimental platform.The actual transfer function between the sampled data of voltage and the sampled data of current Hall sensor was given.Theoretical fitting curve of the transfer function and the actual fitting curve of the transfer function were compared.The results indicate that the designed detection method has small error and good reliability,and lays a foundation for the next experiment.