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Extremum Seeking Control based MPPT for photovoltaic array under uniform and non-uniform irradiances

Van Manh Hoang and Ngoc Viet Nguyen and Manh Thang Pham (2016) Extremum Seeking Control based MPPT for photovoltaic array under uniform and non-uniform irradiances. In: The 4th International Conference on Engineering Mechanics and Automation (ICEMA), 25-27 July 2016, Hanoi, Vietnam.

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Abstract

In order to extract the maximum power from photovoltaic (PV) array, the maximum power point tracking (MPPT) technology has always been applied in PV systems. The Perturb and Observe (P&O) and Incremental Conductance (INC) methods are the most popular and widely used under the constant irradiance. However, the changes of the environmental parameters, such as cloud cover or the building block, will lead to the radiation change and then have a direct effect on the location of Maximum Power Point (MPP). In order to carry out MPPT in PV array under Partial Shading Conditions (PSCs), a method based on Extremum Seeking Control (ESC) is applied to determine the optimal value of a reference current in the PV system. The proposed ESC approach for the Global Maximum Power Point Tracking (GMPPT) in this work uses a series combination of a High Pass Filter (HPF) and two Low Pass Filters (LPFs). These three filters act as two Band Pass Filters (BPFs) and let a specific frequency of input power which includes the derivative of PV with respect to its voltage pass through. This auto-tuning strategy was developed to maximize the PV array output power through the regulation of the voltage input to the DC-DC boost converter in order to lead the PV array steady-state to a stable oscillation behavior around the Global Maximum Power Point (GMPP). The performance of the proposed ESC algorithm is evaluated by comparing it with the conventional ESC and modified P&O method in terms of tracking speed and accuracy by utilizing MATLAB SIMULINK. The simulation results demonstrate that the tracking capability of the proposed ESC algorithm is superior to that of the conventional ESC and modified P&O algorithm, particularly under low radiance and sudden mutation irradiance conditions. Key Words: Boost converter; Extremum Seeking Control; Maximum Power Point Tracking (MPPT); Partial Shading Conditions (PSCs); Photovoltaic (PV) system.

Item Type:Conference or Workshop Item (Paper)
Subjects:Engineering Mechanics
Divisions:Faculty of Engineering Mechanics and Automation (FEMA)
ID Code:2202
Deposited By: Hoàng V�n Mạnh
Deposited On:31 Dec 2016 10:01
Last Modified:13 Jan 2017 02:28

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