计及间谐波的电动汽车快速充电装置电能计量

Electrical Energy Metering in Consideration of Inter-harmonics from the EV Fast Charging Device

为了减少电动汽车快速充电装置产生的谐波和间谐波对电能计量的不利影响,通过分析快速充电装置模型的谐波和间谐波功率特性,研究了一种基于广义dk-qk坐标变换的电能计量方法。该方法通过坐标变换与反变换可以快速、准确地区分充电装置产生的任意k次谐波和间谐波参数,实现基波电能、谐波电能和间谐波电能的分别计量。通过实验仿真,证明了所提方法的可行性。

To reduce the negative impact on electrical energy metering caused by the harmonics and inter-harmonics arising from an electric vehicle（EV） fast charging device, an electric energy metering method based on generalized dk-qu co-ordinate transformation is proposed through analyzing the power characteristics of harmonics and interharmonics of an EV charger based on a fast charging device model. This method can distinguish the parameters of arbitrary kth harmonics and inter-harmonics fast and accurately based on coordinate and inverse coordinate transformations, and can meter the electric energy of fundamental wave, harmonics, and inter-harmonics, respectively. The result of simulation experiment shows that the proposed method is feasible.