Virtual Conductance Based Cascade Voltage Controller for VSCs in Islanded Operation Mode  

作　　者：Francisco Jesús Matas-Díaz Manuel Barragán-Villarejo Juan Carlos Olives-Camps Juan Manuel Mauricio JoséMaría Maza-Ortega 

机构地区：[1]Department of Elec‐trical Engineering,Universidad de Sevilla,Seville 41092,Spain

出　　处：《Journal of Modern Power Systems and Clean Energy》2022年第6期1704-1713,共10页现代电力系统与清洁能源学报（英文）

基　　金：supported by the European Union Horizon 2020 under grant agreement 764090(EASY-RES);Spanish Ministry of Economy under grant ENE2017-84813-R and CERVERA Research Programme of CDTI,the Industrial and Technological Development Centre of Spain,under the research project HySGrid+(CER-20191019);in part by Universidad de Sevilla in the framework of VI PPIT-US.

摘　　要：Voltage source converters have become the main enabler for the integration of distributed energy resources in microgrids.In the case of islanded operation,these devices normally set the amplitude and frequency of the network voltage by means of a cascade controller composed of an outer voltage control loop and an inner current control loop.Several strategies to compute the gains of both control loops have been proposed in the literature in order to obtain a fast and decoupled response of the voltages at the point of common coupling.This paper proposes an alternative and simple methodology based on the introduction of a virtual conductance in the classic cascade control.This strategy allows to design each control loop independently,obtaining a closed-loop response of a first-order system.In this way,the gains of each control loop are easily derived from the parameters of the LC coupling filter and the desired closed-loop time constants.Furthermore,a state observer is included in the controller to estimate the inductor current of the LC filter in order to reduce the number of required measurements.A laboratory testbed is used to validate and compare the proposed controller.The experimental results demonstrate the effectiveness of the proposal both in steady-state and transient regimes.

关 键 词：Voltage source converter MICROGRID cascade controller virtual conductance 

分 类 号：TM46[电气工程—电器] TP273[自动化与计算机技术—检测技术与自动化装置]