scholarly journals PV Power-Generation System with a Phase-Shift PWM Technique for High Step-Up Voltage Applications

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Cheng-Tao Tsai ◽  
Sin-Hua Chen
Keyword(s):  
Power Generation ◽  
Phase Shift ◽  
Pulse Width Modulation ◽  
Maximum Power ◽  
Generation System ◽  
Output Stage ◽  
Point Tracking ◽  
Power Switches ◽  
Power Generation System ◽  
Pv Power Generation

A PV power-generation system with a phase-shift pulse-width modulation (PWM) technique for high step-up voltage applications is proposed. The proposed power-generation system consists of two stages. In the input stage, all power switches of the full-bridge converter with phase-shift technique can be operated with zero-current switching (ZCS) at turn-on or turn-off transition. Hence, the switching losses of the power switches can be reduced. Then, in the DC output stage, a voltage-doubler circuit is used to boost a high dc-link bus voltage. To supply a utility power, a dc/ac inverter is connected to induce a sinusoidal source. In order to draw a maximum power from PV arrays source, a microcontroller is incorporated with the perturbation and observation method to implement maximum power point tracking (MPPT) algorithm and power regulating scheme. In this study, a full load power of 300 W prototype has been built. Experimental results are presented to verify the performance and feasibility of the proposed PV power-generation system.

Sliding Mode MPPT Controller for Photovoltaic Systems Under Partial Shading Conditions

2016 ◽  
Vol 20 (7) ◽  
pp. 1112-1118 ◽  
Author(s):  
Min Ding ◽  
◽  
Yi Tang ◽  
Weihua Cao ◽  
Zhili Tan ◽  
...  
Keyword(s):  
Power Generation ◽  
Sliding Mode ◽  
Mathematic Model ◽  
Generation System ◽  
Partial Shading ◽  
Point Tracking ◽  
Power Generation System ◽  
Output Characteristics ◽  
Pv Power Generation ◽  
Average State

This study focuses on maximum power point tracking (MPPT) control for photovoltaic (PV) power generation systems under partial shading conditions. A mathematic model of the partially shaded solar cell is built. Then, the output characteristics of the partial-shade array are analyzed. Based on the model of the PV battery and the concept of the average-state switch cycle, an average-state mathematical model of the PV power generation system using a boost circuit for the realization circuit is established. A sliding mode controller based on the integral sliding mode function is designed to realize MPPT in the PV power generation system. Finally, simulations in MATLAB/Simulink confirm the functionality and performance of the proposed controller.

Research on Optimal Gradient - Climbing Algorithm in Wind Power Generation

2013 ◽  
Vol 385-386 ◽  
pp. 1100-1103 ◽  
Author(s):  
Qiang Zhao ◽  
Chang Cui
Keyword(s):  
Power Generation ◽  
Wind Power ◽  
Search Algorithm ◽  
Buck Converter ◽  
Wind Power Generation ◽  
Generation System ◽  
Load Impedance ◽  
Point Tracking ◽  
Power Generation System ◽  
Step Climbing

Maximum power point tracking for wind power generation system fixed step climbing algorithm prone to miscalculation and oscillation shortcomings. Adaptive improved optimal gradient method is put forward to overcome the shortcomings and optimize the existing fixed step climbing algorithm. By Controlling Buck Converter duty radio rapidly match between wind power generation system and load impedance. The simulation result shows that the anti-interference and convergence of the improved hill-climb search algorithm is better than that of the traditional one.

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