数字变电站中电子式变压器自适应控制与校正方法

Self-adaptive Control and Correction Method forElectronic Transformers at Digital Substations

针对现有电子式变压器控制方法动态性能不佳且数据校正精度较低等问题,提出了数字变电站中电子式变压器自适应控制与校正方法。首先,采用模糊逻辑控制器自动调节比例积分控制器的增益参数,以实现电子式变压器的自适应控制。然后,利用改进的快速傅里叶变换算法对采样数据进行截断叠加,并结合卷积窗算法修正主频谱,以有效抑制高次谐波及谱间干扰对幅值和相位的影响。最后利用MATLAB软件对方法的性能进行试验论证。结果表明,与其他方法相比,方法具有更好的动态性能与电能质量。

In view of poor dynamic performance and low data correction accuracy of the existing electronic transformer control method,a self-adaptive control and correction method was proposed for electronic transformers used at digital substations.Firstly,the gain parameter of the proportional-integral controller was adjusted automatically by the fuzzy logic controller,so as to realize self-adaptive control of the electronic transformer.Then,the improved FFT algorithm was used to truncate and stack the sampling data,and correct he main frequency spectrum with the help of the convolution window algorithm,so as to effectively suppress the influence of high-order harmonics and spectral interference upon the amplitude and phase.Finally,demonstration experiments were made through MATLAB for the proposed approach.The results indicated that,compared with other methods,the proposed method had a better dynamic performance and power quality.