Title :
Computed current control method for maximum power point tracking of a grid-connected photovoltaic system
Author_Institution :
Univ. of Montana, Missoula, MT, USA
Abstract :
This paper proposes a new Maximum Power Point Tracker (MPPT) topology for a single phase, grid-connected PV system considering the sudden changes in environmental conditions. The MPPT takes into account the nonlinearity of photovoltaic (PV) array, the oscillation of PV voltage around the MPP, and the inverter filter design. The MPPT is designed so that current reference is computed directly from the PV voltage and PV current to assure the system´s stability with simple control algorithm. Convergence to the MPP is obtained very fast without need of perturbation or predefined constant. Its performance in term of tracking speed is compared with the conventional Ripple Correlation Control (RCC) method under step changes in irradiation.
Keywords :
electric current control; invertors; maximum power point trackers; photovoltaic power systems; power filters; power generation control; power grids; MPPT topology; PV array nonlinearity; PV current; PV voltage; PV voltage oscillation; computed current control method; conventional RCC method; conventional ripple correlation control method; current reference; environmental condition; grid-connected photovoltaic system; inverter filter design; maximum power point tracking; photovoltaic array nonlinearity; single-phase grid-connected PV system; system stability; tracking speed; Arrays; Equations; Inverters; Mathematical model; Maximum power point trackers; Steady-state; Voltage control;
Conference_Titel :
Power and Energy Conference at Illinois (PECI), 2015 IEEE
Conference_Location :
Champaign, IL
DOI :
10.1109/PECI.2015.7064921
