Model Predictive Direct Power Control of Grid-connected Converters Considering Unbalanced Filter Inductance and Grid Conditions  

作　　者：Weichen Yang Shihong Miao Zhiwei Liu Ji Han Yulong Xiong Qingyu Tu 

机构地区：[1]State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Hubei Electric Power Security and High Efficiency Key Laboratory,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology

出　　处：《Journal of Modern Power Systems and Clean Energy》2021年第6期1279-1288,共10页现代电力系统与清洁能源学报（英文）

基　　金：supported by the Science and Technology Projects of State Grid Corporation of China “Key Technologies and Demonstration Application of Distributed Power Clusters Regulation”(No. 52153220000U)。

摘　　要：The grid-connected converter(GCC) is widely used as the interface between various distributed generations and the utility grid. To achieve precise power control for GCC, this paper presents a model predictive direct power control(MPDPC)with consideration of the unbalanced filter inductance and grid conditions. First, the characteristics of GCC with unbalanced filter inductance are analyzed and a modified voltage control function is derived. On this basis, to compensate for the power oscillation caused by unbalanced filter inductance, a novel power compensation method is proposed for MPDPC to eliminate the DC-side current ripple while maintaining sinusoidal grid current. Besides, to improve the control robustness against mismatched filter inductance, a filter inductance identification scheme is proposed. Through this scheme, the estimated value of filter inductance is updated in each control period and applied in the proposed MPDPC. Finally, simulation results in PSCAD/EMTDC confirm the validity of the proposed MPDPC and the filter inductance identification scheme.

关 键 词：Inductance identification grid-connected converter model predictive control power oscillation elimination unbalanced grid conditions 

分 类 号：TM46[电气工程—电器]