scholarly journals A New Synchronization Technique of a Three-Phase Grid Tied Inverter for Photovoltaic Applications

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Mohannad Jabbar Mnati ◽  
Dimitar V. Bozalakov ◽  
Alex Van den Bossche
Keyword(s):  
Pulse Width Modulation ◽  
Digital Circuit ◽  
Phase Voltage ◽  
Grid Voltage ◽  
Synchronization Method ◽  
Grid Synchronization ◽  
Three Phase ◽  
Reference Signals ◽  
Analog And Digital Circuits ◽  
And Control

Three-phase grid synchronization is one of the main techniques of the three-phase grid connected power inverters used in photovoltaic systems. This technique was used to reach the fast and accurate three-phase grid tied inverter synchronization. In this paper a new synchronization method is presented on the basis of integrating the grid voltage two times (line-to-line or phase voltage). This method can be called “double integral synchronization method” (DISM) as it integrates the grid voltage signals two times to generate the reference signals of three-phase photovoltaic inverter currents. DISM is designed and simulated in this paper to operate in both analog and digital circuits of three-phase photovoltaic inverter system with the same topology. The digital circuit design and dsPIC33FJ256GP710A as a microcontroller (the dsPIC33FJ256GP710A with the Explorer 16 Development Board from microchip) was used practically in this paper to generate and control the sine pulse width modulation (SPWM) technique according to DISM for three-phase photovoltaic inverter system. The main advantage for this method (DISM) is learning how to eliminate the integration constant to generate the reference signals without needing any reference signals or truth table, just the line-to-line or phase voltage of grid.

Research on the Application of New Active Inverter Technology in Battery Maintenance

2013 ◽  
Vol 448-453 ◽  
pp. 2077-2084
Author(s):  
Bing Yu Li ◽  
Ke Xu ◽  
Yun Ming Li ◽  
Xuan Yi Li
Keyword(s):  
Pulse Width Modulation ◽  
Detection Method ◽  
Power Station ◽  
Inspection Method ◽  
Discharge System ◽  
Passive Detection ◽  
Three Phase ◽  
Active Detection ◽  
And Control ◽  
Control Topology

This paper presents a discharge inspection method based on new active inverter feedback discharge after comparison with the check discharge from pure resistance of power station batteries. A new active inverter system has been developed with SPWM pulse width modulation technology, which is based on DC/DC circuitry, along with a three-phase full bridge inverter and control topology circuits. In addition, the principle for selecting the parameters of RCL elements of the system has been analyzed. This paper also presents a detection method combining active detection with passive detection for the islanding effect which exists in the grid-connected discharge system, according to the islanding effect of grid-connected discharge equipment, so as to stably discharge without interference on the grid.

The Analysis of the Grid-Connected Phase-Locked Loop Technologies Based on the Transformation of Coordinate System

2012 ◽  
Vol 220-223 ◽  
pp. 1175-1180
Author(s):  
Guo Tao Yang ◽  
Zhi Yi Sun ◽  
Li Qun Liu
Keyword(s):  
Simulation Analysis ◽  
Phase Locked Loop ◽  
Phase Voltage ◽  
Grid Voltage ◽  
Advantages And Disadvantages ◽  
Pv Inverter ◽  
Three Phase ◽  
Failure Conditions ◽  
Grid Connected Inverter ◽  
Generating System

In order to gain the same amplitude、frequency and phase between the output voltage of the inverter and the grid voltage, the phase-locked loop (PLL) technology is widely used in grid-connected photovoltaic (PV) generating system, which is normally used to obtain instantaneous phase information to achieve the grid-connected purpose of PV inverter. The detective accuracy of frequency and phase of the grid voltage is directly affected by the PLL. Two software PLL technologies are compared by using the simulation analysis which is based on the d-q transformation. To provide the basis for the design of grid-connected inverter, the advantages and disadvantages of two software PLL technologies are analyzed under different grid failure conditions, such as one phase voltage dropped, two of three phase voltage (TPV) dropped, grid frequency mutated, and grid voltage offset, etc. Particularly, the appropriate PLL technology can effectively improve the grid-connected ability of PV inverter under the grid voltage offset or unbalance conditions.

scholarly journals An Analysis of Virtual Flux Direct Power Control of Three-Phase AC-DC Converter

2018 ◽  
Vol 9 (3) ◽  
pp. 947 ◽  
Author(s):  
Nor Azizah Mohd Yusoff ◽  
Azziddin M. Razali ◽  
Kasrul Abdul Karim ◽  
Auzani Jidin ◽  
Tole Sutikno
Keyword(s):  
Steady State ◽  
Power Control ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Dynamic Performance ◽  
Direct Power ◽  
Direct Power Control ◽  
Grid Voltage ◽  
Three Phase ◽  
Virtual Flux

<p>This paper presents an analysis of virtual-flux direct power control (VFDPC) technique for the three-phase pulse width modulation (PWM) ac-dc converter. The proposed VFDPC is developed by assuming the grid voltage and converter line filters quantities are related to a virtual three-phase ac motor. The controller works with less number of sensors by eliminating the voltage sensors used for measuring the three-phase grid voltage. The grid virtual flux which is proportional to the grid voltage will be estimated from the information of converter switching states, line current, and dc-link output voltage. Several analyses are performed in order to study the steady state and dynamic performance of the converter, particularly during the load and DC voltage output reference variations. The proportional integral (PI) controller at the outer voltage control loop of VFDPC is tuned properly and the entire PWM ac-dc converter system is simulated using MATLAB/Simulink to ensure the dc output voltage follow the desired output voltage under steady state and dynamic conditions. Ac-dc converter utilizing the proposed VFDPC is able to generate three-phase input current waveforms that are almost sinusoidal with low harmonics contents which is less than 5% and near unity power factor (<em>pf</em>) operation.</p>

Comparative Study of SPWM and HEPWM Techniques for Photovoltaic Inverter

2015 ◽  
Vol 1115 ◽  
pp. 555-559
Author(s):  
Douadi Bendib ◽  
F. Akel ◽  
M. Chikh ◽  
C. Larbes ◽  
M. Laour ◽  
...  
Keyword(s):  
Pulse Width Modulation ◽  
Evaluation Study ◽  
Voltage Source ◽  
Phase Voltage ◽  
Voltage Source Inverter ◽  
Pv Array ◽  
Harmonic Elimination ◽  
Output Quality ◽  
Three Phase ◽  
Sinusoidal Pulse Width Modulation

This paper presents an evaluation study of two pwm techniques applied to a three-phase voltage source inverter supplied by photovoltaic (PV) energy sources. A Pspice-based model of the pv array is developed and tested. The power and currant of the pv array versus the voltage is plotted. Then the pv array is connected to a basic three phase voltage source inverter VSI. Two control techniques are used. The first one is the classic sinusoidal pulse width modulation spwm, which is based on the comparison of two signals, the sinusoidal reference and a triangular carrier. The second one is based on the principle of harmonic elimination. The system is simulated using orcad-pspice, the results are given, discussed and compared based on different performance indices (output quality, thd, frequency).

Design of Monitor and Control System of Screw Pump Oil Production Based on ATT7022

2013 ◽  
Vol 753-755 ◽  
pp. 2145-2148
Author(s):  
Chun Yu Xiong ◽  
Feng He Qi ◽  
Zong Guang Guo ◽  
Yun Bo Xia
Keyword(s):  
Phase Voltage ◽  
Production Well ◽  
Electrical Parameters ◽  
Screw Pump ◽  
Current Frequency ◽  
Pump Failure ◽  
Three Phase ◽  
And Control ◽  
Time Acquisition ◽  
Fluid Parameters

Design a working condition monitoring and intelligent diagnosis system for screw pump based on the ATT7022 chip. Achieve real-time acquisition, storage, analysis of the driving motor electrical parameters of three-phase voltage, current, frequency, active and inactive power, power factor, and the fluid parameters of screw pump production well pressure, pressure, temperature. Accomplish monitoring, alarm and automatic protection the screw pump failure of rod breaking, pump sticking, vacuum, lack of power phase. Using PIC microprocessor to automatic compensate the screw pump motor power, to improve the work efficiency.

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