Feedback linearization based control for weak grid connected PV system under normal and abnormal conditions

doi:10.1007/s11708-017-0459-5

Front. Energy

2020, Vol. 14

Issue (2) : 400-409 https://doi.org/10.1007/s11708-017-0459-5

RESEARCH ARTICLE

Feedback linearization based control for weak grid connected PV system under normal and abnormal conditions

Rahul SHARMA(

), Sathans SUHAG

Department ofElectrical Engineering, NIT, Kurukshetra 136119, India

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Abstract

This paper proposes a control strategy for interface of distributed energy sources into the weak grid system with a focus on the energy and ancillary services. A novel controller has been designed and implemented to tackle the challenges of coupling terms in the LCL filter, the transient behavior under sudden changes, and the voltage support under fault condition using the feedback linearization technique. The controller proposed has been implemented on the PV system connected with the weak grid using the LCL filter and the performance of the controller has been verified using Matlab/Simulink through simulation under different conditions. The results of the controller proposed have been compared with the conventional PI dual loop controller. The simulation results obtained demonstrate the effectiveness and simplicity of the controller design strategy.

Keywords PV system grid interface feedback linearization inverter LCL filter

Corresponding Author(s): Rahul SHARMA

Just Accepted Date: 15 February 2017 Online First Date: 07 April 2017 Issue Date: 22 June 2020

Cite this article:

Rahul SHARMA,Sathans SUHAG. Feedback linearization based control for weak grid connected PV system under normal and abnormal conditions[J]. Front. Energy, 2020, 14(2): 400-409.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-017-0459-5
https://academic.hep.com.cn/fie/EN/Y2020/V14/I2/400

Fig.1 Schematic of PV inverter system connected to grid with an LCL filter

Fig.2 Control structure of grid connected PV system

Tab.1 Simulation parameters

Fig.3 Irradiance waveform

Fig.4 Active power waveform of the system

Fig.5 Grid voltage of the system

Fig.6 Grid current of the system

Fig.7 Phase voltage and current waveform

Fig.8 DC link voltage of the system without disturbance and noise

Fig.9 I_d, I_d* and I_q, I_q*current waveforms of the system

Fig.10 Results waveform using the control design proposed

Fig.11 Results waveform using the conventional control design

Fig.12 FFT graph using conventional control design

Fig.13 FFT graph using the control design proposed

Fig.14 Waveforms under fault condition using controller proposed

Fig.15 Waveforms under fault condition using conventional controller

Fig.16 DC link voltage of the system with disturbance and noise

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