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非正弦供电情况下,平均功率和其它电量均值已广泛采用了离散采样的测量方法,相继出现了几种不同的算法。可分为二类:一类基于时域积分,如同步采样算法、采样补偿算法;另一类基于数字滤波,如准同步采样算法、改进算法等。后一类具有硬件实现容易,准确度高,抗干扰性能好,允许频率波动等突出点,因而越来越被人们所采用。应用数字滤波技术测量平均功率的关键是窗函数的选择。文献使用了基于矩形窗的一种重复卷积方法。文献作了改进,用基于矩形窗和哈明窗的组合窗对功率信号的离散采样值作数字滤波,获得了较好的效果。
In the case of non-sinusoidal power supply, the average power and other power mean values have been widely used discrete sampling measurement methods, there have been several different algorithms. Can be divided into two categories: one based on time-domain integration, such as synchronous sampling algorithm, sampling compensation algorithm; the other based on digital filtering, such as quasi-synchronous sampling algorithm, improved algorithm. The latter category has the hardware to achieve easy, high accuracy, anti-jamming performance, allowing the frequency fluctuations and other salient points, and therefore more and more people are using. The key to using digital filtering to measure the average power is the choice of window function. The literature uses a repetitive convolution method based on rectangular windows. The literature has been improved. The combination of rectangular window and Hamming window based on the discrete sampling of the power signal for digital filtering, and achieved good results.