双电源转换开关电网信号检测电路设计

Design of Signal Detection Circuit of Dual Power Switch

风能的波动性、间接性和随机性等特性对接入风电的电网运行特性和电能质量(如电压、频率偏差)造成影响。双电源转换开关作为电网中连续供电的一种保障,广泛应用于各种重要负载场合。完成电网信号现场参量及其检测是双电源转换开关的首要任务之一。针对风电机组并网运行中的电网电能质量问题,就双电源转换开关电网信号检测电路分别进行了硬件和软件设计。硬件设计以TMS320F28335数字信号处理器为核心控制模块,利用其内部的模/数转换器和捕获模块对电网中的电压和频率进行检测;软件设计则编写了电压和频率的采样和算法程序。该电网信号检测电路具有采样精度高、硬件成本低、检测算法简单等优点,可以最大化保障重要负载的连续供电。

The operation characteristics and power quality of the grid are affected by the properties of wind power generation such as fluctuation,intermittence,randomicity,and so on.As a guarantee of continuous power supply in power grid,dual power switch is widely used in various important load occasions.It is one of the primary tasks to complete the field parameters of power network signal and its detection.In view of the problem of power quality in the grid during the grid-connected operation of wind turbines,this paper designed the hardware and software respectively for the signal detection circuit of the double-power switch grid.The hardware design takes TMS320F28335 DSP as the core control module,and uses its internal analog/digital converter(ADC)and capture module(eCAP)to detect the voltage and frequency in the power grid.The network signal detection circuit has the advantages of high sampling accuracy,low hardware cost,simple detection algorithm and so on.