Design of the Three-Phase Photovoltaic Grid-Connected Inverter

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.

Study on Simulation of Three-Phase Z-Source Inverter for Grid-Connected Wind Power Generation

2011 ◽  
Vol 383-390 ◽  
pp. 2018-2024
Author(s):  
Hua Qiang Zhang ◽  
Peng Fei Wei ◽  
Wei Wei Li
Keyword(s):  
Power Generation ◽  
Wind Power ◽  
Simulation Models ◽  
Wind Power Generation ◽  
Unity Power Factor ◽  
System A ◽  
Three Phase ◽  
Power Generation System ◽  
Grid Connected Inverter ◽  
Switching State

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.

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

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.

scholarly journals MATHEMATICAL MODELLING AND SIMULATION OF GRID CONNECTED SOLAR PHOTOVOLTAIC SYSTEM

2014 ◽  
pp. 195-199
Author(s):  
K. N. DINESH BABU ◽  
R. RAMAPRABHA ◽  
V. RAJINI
Keyword(s):  
Reactive Power ◽  
Photovoltaic System ◽  
Modulation Index ◽  
Maximum Output ◽  
Solar Photovoltaic ◽  
Point Tracking ◽  
Three Phase ◽  
Grid Connected Inverter ◽  
Power Point ◽  
Solar Photovoltaic System

This paper presents the mathematical modeling of three-phase grid connected inverter fed by Solar Photovoltaic (SPV) system with Maximum Power Point Tracking (MPPT). Analysis has been carried out to choose the proper modulation index for maximum output for three-phase inverter. With this modulation index, the variation of the active and reactive power for different loads has been presented along with major parameters like Transfer ratio and Efficiency. Also the Real and Reactive power output of the SPV has been measured with various solar Radiation levels.

scholarly journals Improved Frequency Locked Loop Based Synchronization Method for Three-Phase Grid-Connected Inverter under Unbalanced and Distorted Grid Conditions

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1023 ◽  
Author(s):  
Wenjie Ma ◽  
Sen Ouyang ◽  
Weidong Xu
Keyword(s):  
Fundamental Frequency ◽  
Dynamic Performance ◽  
Negative Sequence ◽  
Order Linear ◽  
First Order ◽  
Synchronization Method ◽  
Distorted Grid ◽  
Three Phase ◽  
Simulation And Experiment ◽  
Grid Connected Inverter

To quickly and accurately estimate the parameters of the fundamental positive- and negative-sequence under the unbalanced and distorted grid voltage, a synchronization method is presented in this paper. The proposed method is based on both a harmonic decoupling network consisting of multiple dual second-order generalized integrators (MDSOGIs) and an improved frequency locked loop (IFLL), so it is called the MDSOGI-IFLL. Due to the IFLL, the system has the feature that the dynamic performance of estimating the fundamental frequency is independent of the variation of both the fundamental positive- and negative-sequence voltage. In this paper, a first-order linear frequency adaption model is established for the design of the IFLL. Finally, the good performance of the proposed MDSOGI-IFLL is validated by the simulation and experiment.

Three-Level Grid-Connected Inverter Based on Voltage-Oriented Control in Photovoltaic Generation Systems

2013 ◽  
Vol 765-767 ◽  
pp. 2494-2497
Author(s):  
Fang Ping Zhao ◽  
Yong Yang
Keyword(s):  
Current Control ◽  
Control Loop ◽  
Unity Power Factor ◽  
Photovoltaic Generation ◽  
Pwm Inverter ◽  
Pulse Width Modulated ◽  
Three Phase ◽  
Control Scheme ◽  
Grid Connected Inverter ◽  
Power Point

The paper propose a new control of a three-phase three-level neutral-point-clamped (NPC) pulse width modulated (PWM) inverter in photovoltaic generation systems. The control scheme is mainly based on voltage-oriented control (VOC) with an improved maximum power point (MPP) tracking (MPPT). A cascaded control structure with an outer dc link voltage control loop and an inner current control loop is used. The currents are controlled in a synchronous dq reference frame using a decoupled feedback control. Furthermore, in order to achieve a unity power factor, the q-axis current reference is set to zero. The experimental results have proven an excellent performance and verified the validity of proposed system.

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