用于船舶电站控制器的交流采样算法研究

对交流采样算法的分析表明，离散傅立叶算法不能算出频率，在非整周期同步采样时误差较大。非同步算法中的加窗插值算法通过加窗插值减小频谱泄漏，不需整周期同步采样，可直接计算频率，对船舶电站采样具有很好的适应性。该算法多针对谐波分析，当用于船舶电站，只计算基波参数时，需选择合理采样方案。通过对算法的分析与推导，选择合理采样方案，在满足精度要求的同时使计算量适中，并应用于船舶电站控制器，很好地满足采样要求。

Studies of Ac Sampling AlgorithmsUsed in Ship Power Station Controllers

According to analysis of AC sampling algorithms, discrete Fourier algorithm (DFT) cannot calculate frequency; asynchronous sampling and non-integer period interception will cause large errors. Windowed interpolation algorithm based on asynchronous sample, uses windowed interpolation to reduce spectral leakage, can directly calculate frequency, has good adaptability to ship power station. Windowed interpolation algorithm is widely used in harmonic analysis. When using this algorithm to calculate fundamental parameters, a reasonable sampling scheme is required. Through analysis and derivation of this algorithm, a reasonable sampling scheme is chosen to meet the accuracy requirements while reducing computation cost. The windowed interpolation algorithm is applied to a ship power station controller, and obtained good results.