Neural network controlled grid interfaced solar photovoltaic power generation

Abstract

This study deals with a NN (neural-network)-based control algorithm of a grid interfaced SPV (solar photovoltaic) generating system. The proposed grid interfaced SPV generating system utilises a NN control algorithm-based on the LMS (least mean-square), known as Adaline (adaptive linear element) to estimate reference grid currents. A DC-DC boost converter is used for achieving the maximum power point tracking between SPV and DC bus of four-leg VSC (voltage source converter) interfaced to a three-phase, four-wire distribution system. The four-leg VSC of SPV generating system is also used for the compensation of the reactive power for zero voltage regulation or for power factor correction along with load balancing, elimination of load harmonics currents and mitigation of neutral current at PCC (point of common coupling) in three-phase four-wire distribution system. The DC bus of VSC is supported by a capacitor which is fed by SPV energy through a DC-DC boost converter. A laboratory prototype of proposed grid interfaced SPV generating system is developed to validate its developed model and the NN-based control algorithm.

A Comprehensive Review on Grid-TiedSolar Photovoltaic System

“…This section describes the history of grid-tied PV system with recent progress in the industry and academia [1][2][3][4][5][6][7][8][9]. In literature, different modelling methods of solar systems are available.…”

“…Parameters are determined with the help of some assumptions made by the researchers [15][16][17][18][19] (6) Define k = I sc /I o and substitute Equation (6) in (5), we get…”

“…As the advancement in the material is going on, the cost of material starts reducing. Therefore power bodies start promoting solar power generation [6]. The government is also giving subsidies to promote the renewable sources of energy.…”

“…For the remaining part of the day the solar converters were switched off to save the power which occurs due to switching losses. These converters can be utilized for the remaining two third part of the day by using them as shunt active power compensator [3][4][5][6][7]. This will enhance the efficiency of the overall system [8].…”

An Adjustable DC Link Voltage-Based Control of Multifunctional Grid Interfaced Solar PV System

“…A single phase two stage grid tied PV generation system with constant DC link voltage is shown in [18]. Moreover, the three phase grid tied PV generation system with constant DC link voltage control is also shown in [19]- [20]. The DC link voltage of VSC is kept constant (higher than peak of maximum allowable line voltage) using a PI controller [19]- [20].…”