发电机并网测频方法综合比较

发电机并网发电时,应保证发电机与电网的频率相等。综合比较了发电机并 网时常用的几种数字式测频方法:直接测频法、测周法、多周期同步法、基于CROSS算法的 测频、三点拟合法、基于傅立叶变换的测频法、基于神经网络的测频法,对各种方法的测频误 差进行分析,比较其最佳适用范围,为实际应用提供了一定的指导。

Analysis and Comparison of Methods of Frequency Measurement for Generators in Parallel

When a generator is paralleled with the net, the frequency of the generator and the net must be the same. This article compared several digital methods of frequency measurement for generators in parallel: direct frequency measurement, period measurement, simultaneous frequency measurement in many periods, frequency measurement based on cross algorithm, curve fitting with three points, frequency measurement based on F transformation and frequency measurement based on ANN. The authors of the article analyzed errors of each method, pointed out the optimum usage and provided a guide for selection in application.