Design and implementation of three-phase grid-connected inverter for photovoltaic power generation

For the special requirements of grid-connected inverter used in wind power generation system, a kind of three-phase Z-Source inverter operational principle is analyzed in this paper. Formulas for the design of main parameters under the control of constant duty cycle of shoot-through switching state are derived. Then the simulation models of SVPWM with shoot-through zero vectors are established by using Matlab/Simulink in order to control the switches of Z-Source inverter on and off. The independent control strategy of d-axis and q-axis currents is used to achieve a unity power factor grid-connected aim. Simulation results show that the theoretical analysis and the simulation models are validity.

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Grid-Connected Control System for Three-Phase Bidirectional DC/AC Converter to Exploit Photovoltaic Power Generation

American Journal of Engineering and Technology Management ◽

10.11648/j.ajetm.20170206.15 ◽

2017 ◽

Vol 2 (6) ◽

pp. 98

Author(s):

Le Tien Phong

Keyword(s):

Power Generation ◽

Control System ◽

Photovoltaic Power ◽

Three Phase

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Design of the Three-Phase Photovoltaic Grid-Connected Inverter

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.986-987.1938 ◽

2014 ◽

Vol 986-987 ◽

pp. 1938-1941

Author(s):

Kui Hua Wu ◽

Wei Sun ◽

Jian Wang ◽

Shen Quan Yang ◽

Yi Qun Wang ◽

...

Keyword(s):

Power Generation ◽

Sampling Method ◽

Current Mode ◽

Development Trend ◽

Solar Photovoltaic ◽

Experiment Research ◽

Pwm Inverter ◽

Three Phase ◽

Simulation And Experiment ◽

Grid Connected Inverter

Photovoltaic grid-connected power generation is the inevitable development trend of solar photovoltaic systems,grid inverter is an essential part of photovoltaic grid-connected power generation. With the developed three phase current type PWM inverter device as the research object, and symmetry rules sampling method is applied to the inverter, through the method combined by the computer simulation and experiment research, the device was verified by simulation and experimental .The results show that: This method could not only effectively reduce the DC side inductance volume of the current-mode PWM inverter , and it could make output AC currents sinusoidal and in phase with grid voltages, but also improve the efficiency of the system, it will be more suitable for photovoltaic grid-connected.

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A Study of Phase-Locked Technology of Wind Power Generation Three-Phase Grid-Connected Inverter

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.383-390.3449 ◽

2011 ◽

Vol 383-390 ◽

pp. 3449-3455

Author(s):

Sheng Wen Fan ◽

Chun Yu Zheng ◽

Zheng Xi Li ◽

Chun Xue Wen

Keyword(s):

Power Generation ◽

Wind Power ◽

Direct Calculation ◽

Wind Power Generation ◽

Signal Delay ◽

Two Phase ◽

Three Phase ◽

Voltage Phase ◽

Grid Connected Inverter ◽

The Mathematical Model

This paper presents two phase-locked methods of wind power generation three-phase grid-connected inverter. First establishes the mathematical model of the inverter, on this basis analyzes why the power voltage phase must be known. And then studies the direct calculation method in α-β coordinates, and analyzes the shortcomings of this approach for three-phase imbalance; then focusing on the phase locked loop (PLL) approach in d-q coordinate system. To solve dynamic response problem of the PLL, a new signal delay cancellation method is put forward. With this improved method, the PLL can have a better performance. Experimental results show that the theoretical analysis is real.

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