基于Wiener级数的交流充电桩电能计量方法研究

针对矩阵式交流充电桩充电时会产生具有冲击性和强时变性的随机扰动,导致其在电能计量周期内计量不准确的问题,提出了基于Wiener泛函级数建立的交流充电桩侧的电网电能计量数学模型。利用该模型可以优化输出的电压、电流同步采样值。同时采用小波算法对电压、电流信号分解与重构,以求得功率潮流分析所需的基波分量与畸变分量,并结合IEEE-Std1459-2010定义,对电压、电流突变的功率潮流进行分析实验。通过Matlab仿真验证了该模型的正确性。实验结果表明,所用的方法在交流充电桩电能计量时误差达到了0.001数量级,提高了交流充电桩的计量精度,有效地解决了在随机扰动情况下交流充电桩电能计量不准的问题。

Research on electric energy measurement method of AC charging pile based on Wiener series

The random disturbance with strong impact and strong time variation, when the matrix AC charging pile is charged, leads to the inaccurate measurement in the electric energy metering period. Therefore, this paper puts forward a mathematical model of power grid energy metering based on Wiener functional series. Using the model can optimize the output voltage and current synchronously. At the same time, it uses the wavelet algorithm to decompose and reconstruct the voltage and current signals to get the fundamental component and the distortion component required by power flow analysis, and carries out experimental analysis on power flow of voltage and current mutation combining with the definition of IEEE-Std1459-2010. The correctness of model is verified through Matlab simulation. The experimental results show that the error of this method in AC charging pile of electric energy metering reaches to 0.001 orders of magnitude, which improves the measurement accuracy of AC charging pile and effectively solves the problem of the inaccurate energy measurement of AC charging pile under the condition of random disturbance. This work is supported by Science and Talents Program of Education Department of Heilongjiang Province (No. 12541136).