Magnetic integrated LCL filter design for a 2.5 kW three-phase grid-connected inverter with double closed-loop control

2021 ◽  
Author(s):  
Feng Chen ◽  
Shiqi Jiang ◽  
Dianheng Jin ◽  
Zhaozhao Mei
Keyword(s):  
Closed Loop ◽  
Filter Design ◽  
Closed Loop Control ◽  
Lcl Filter ◽  
Loop Control ◽  
Three Phase ◽  
Grid Connected Inverter

scholarly journals Research on LCL-type three-phase photovoltaic grid-connected inverter based on passive damping

2021 ◽  
Vol 2137 (1) ◽  
pp. 012017
Author(s):  
Yifeng Gu ◽  
Xianglian Xu ◽  
Xiaobei Yin ◽  
Yu He
Keyword(s):  
Closed Loop ◽  
Resonance Phenomenon ◽  
Passive Damping ◽  
Working Process ◽  
Lcl Filter ◽  
Loop Control ◽  
Simulink Simulation ◽  
Three Phase ◽  
Before And After ◽  
Grid Connected Inverter

Abstract The traditional LCL filter has resonance phenomenon in the working process of three-phase photovoltaic grid-connected inverter system. Based on the analysis of the frequency characteristics of LCL filter equivalent circuit before and after the introduction of passive damping resistor, it is concluded that the resonance of the system can be suppressed after the introduction of passive damping resistor. In the meantime, the current double closed-loop control strategy used in the system is introduced in detail. Finally, the simulation model is built by Matlab/Simulink simulation platform to verify the feasibility of the research method of LCL-type three-phase photovoltaic grid-connected inverter based on passive damping.

A New Small-Signal AC Model and Closed Loop Control of a Three-Phase Interleaved Boost Converter

2018 ◽  
Vol 9 (1) ◽  
pp. 240
Author(s):  
H.V.Gururaja Rao ◽  
Karuna Mudliyar ◽  
R.C. Mala
Keyword(s):  
Solar Energy ◽  
Closed Loop ◽  
Boost Converter ◽  
Closed Loop Control ◽  
Phase Lag ◽  
Small Signal ◽  
Loop Control ◽  
Boost Converters ◽  
Three Phase ◽  
Interleaved Boost Converter

<table width="593" border="1" cellspacing="0" cellpadding="0"><tbody><tr><td valign="top" width="387"><p>Renewable energy sources are increasingly being used today and solar energy is the most readily and abundantly available energy source. Boost converters are an integral part of any solar energy system. In order to obtain maximum possible energy from the solar system multi-phase interleaved boost converters are used. This paper presents the small-signal ac modelling and closed loop control of three-phase interleaved boost converter. State–space modelling methodology has been adopted to have linearized equivalent model of the boost converter. The interleaved three-phase boost converter is averaged over its one switching period and perturbed with small ac variations and finally linearized around its quiescent point to have a small signal ac model.  Type III compensator is employed to improve the frequency response and closed loop control of three-phase boost converter. The controller design procedure is discussed in detail. The effect of right-half plane zero in non-minimum phase system and the appropriate pole-zero placements to overcome the maximum phase lag in such system is discussed. The compensated closed loop system is tested for load variations to observe the transient response.</p><p> </p></td></tr></tbody></table>

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