中文摘要：

提出一种基于串联补偿的细粒度能馈式虚拟负载,文章首先建立单相负载,并以此为基础构建三相四线制串联补偿的细粒度能馈式虚拟负载,单相负载采用一种串联电容与串联电感来构成交流侧电抗的能馈式虚拟负载主电路拓扑结构,有效克服交流侧电感参数选择时不能同时满足功率传输容量及瞬态电流跟踪要求的缺陷,提高了虚拟负载模拟负载最小粒度的精度。利用准PR控制技术,设计了虚拟负载负载换流器（load converter,LC）和能馈换流器（feedback converter,FC）的控制器。最后,利用PSCAD软件构建了仿真模型及控制策略并搭建一套样机,通过仿真及实验结果验证了其可行性和有效性。

英文摘要：

This paper presents a new virtual load with energy feedback based on high-accuracy series compensation. A single-phase load is established firstly; and based on the topology, three-phase four-wire series compensation virtual load with energy feedback is founded. The single phase load uses main circuit topology with its AC side inductor consisting of a series capacitor and a series inductor. This topology solves effectively the problem that the required power transmission capacity cannot be met and transient current cannot be traced at the same time when choosing reactor parameter in AC side, and improves minimum value accuracy in virtual load simulation. Controller of load converter and feedback converter are designed using Quasi-PR technology. Finally, simulation model and control strategy of virtual load are constructed in PSCAD and a prototype is built. Results of simulation and experiment verify feasibility and effectiveness of the proposed method.