Assessment of a fuzzy logic based MRAS observer used in a photovoltaic array supplied AC drive

doi:10.1007/s11708-014-0295-9

Front Energ

2014, Vol. 8

Issue (1) : 81-89 https://doi.org/10.1007/s11708-014-0295-9

RESEARCH ARTICLE

Assessment of a fuzzy logic based MRAS observer used in a photovoltaic array supplied AC drive

Bhavnesh KUMAR¹(

), Yogesh K CHAUHAN¹, Vivek SHRIVASTAVA²

1. School of Engineering, Gautam Buddha University, Greater Noida 201310, India; 2. Electrical Engineering Department, National Institute of Technology Delhi, Delhi 110077, India

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Abstract

In this paper a fuzzy logic (FL) based model reference adaptive system (MRAS) speed observer for high performance AC drives is proposed. The error vector computation is made based on the rotor-flux derived from the reference and the adaptive model of the induction motor. The error signal is processed in the proposed fuzzy logic controller (FLC) for speed adaptation. The drive employs an indirect vector control scheme for achieving a good closed loop speed control. For powering the drive system, a standalone photovoltaic (PV) energy source is used. To extract the maximum power from the PV source, a constant voltage controller (CVC) is also proposed. The complete drive system is modeled in MATLAB/Simulink and the performance is analyzed for different operating conditions.

Keywords induction motor drive fuzzy logic (FL) control model reference adaptive system (MRAS) photovoltaic (PV) array vector control

Corresponding Author(s): KUMAR Bhavnesh,Email:kumar.bhavnesh34@gmail.com

Issue Date: 05 March 2014

Cite this article:

Bhavnesh KUMAR,Yogesh K CHAUHAN,Vivek SHRIVASTAVA. Assessment of a fuzzy logic based MRAS observer used in a photovoltaic array supplied AC drive[J]. Front Energ, 2014, 8(1): 81-89.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-014-0295-9
https://academic.hep.com.cn/fie/EN/Y2014/V8/I1/81

Fig.1 Block diagram of sensorless induction motor drive with MPPT assisted PV source

Fig.2 PV array equivalent circuit

Fig.3 FL-based MRAS speed observer

Fig.4 Fuzzy membership functions for inputs/output

Tab.1 Rule matrix for FLC

Fig.5 Current-voltage () curves for designed PV array
(a) With multiple insolation level; (b) with multiple temperature

Fig.6 DC-DC boost converter
(a) Duty ratio; (b) input and output voltage

Fig.7 Response of motor
(a) Rotor speed; (b) motor current; (c) motor torque

Fig.8 Boost converter
(a) Duty ratio; (b) input and output voltage

Fig.9 Response of motor
(a) Rotor speed; (b) motor torque

Fig.10 Fast varying insolation level

Fig.11 Boost converter
(a) Duty cycle; (b) input and output voltage

Fig.12 Response of motor
(a) Rotor speed; (b) motor torque

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