Discrete-Time DC-Link Voltage and Current Control of a Grid-Connected Inverter with LCL-Filter and Very Small DC-Link Capacitance

被引：3

作者：

Kalmbach, Oliver ^{[1
]}

Dirscherl, Christian ^{[2
]}

Hackl, Christoph M. ^{[1
]}

机构：

[1] Munich Univ Appl Sci, Fac Elect Engn & Informat Technol, Lothstr 64, D-80335 Munich, Germany

[2] Tech Univ Munich, Munich Sch Engn, Lichtenbergstr 4a, D-85748 Garching, Germany

来源：

ENERGIES | 2020年 / 13卷 / 21期

关键词：

current control; dc-link voltage control; discrete controller; discrete linear-quadratic regulator (DLQR); grid connected inverter; LCL-filter; low sampling frequency; PI voltage controller; small dc-link capacitance; stability analysis; PREDICTIVE CONTROL; FEEDBACK-CONTROL; CONTROL STRATEGY; CONTROL SCHEME; CONVERTERS; SYSTEM;

D O I：

10.3390/en13215613

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The paper presents a controller design for grid-connected inverters (GCI) with very small dc-link capacitance that are coupled to the grid via an LCL filter. The usual controller designs would fail and result in instability. The proposed controller has a cascaded structure with a current controller as inner control loop and an outer dc-link voltage controller. The controller design is performed in discrete time and it is based on a detailed stability analysis of the dc-link voltage controller to determine the controller parameters which guarantee stability for all operating points. The inner loop is a state-feedback current controller that is designed based on the discrete linear-quadratic regulator (DLQR) theory. An additional integral error feedback assures steady-state accuracy of the current control loop. The simulation and experimental results validate performance and stability of proposed controller design.

引用

页数：23

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