Design and Implement of Three-Phase Inverter System with Double Mode of Grid-Connection and Stand-Alone

2011 ◽  
Vol 130-134 ◽  
pp. 4265-4269
Author(s):  
Huan Wang ◽  
Zi Long Yang
Keyword(s):  
Simple Structure ◽  
Voltage Source ◽  
Output Current ◽  
Fast Detection ◽  
Grid Connection ◽  
Three Phase ◽  
Seamless Transition ◽  
Bank System ◽  
Pv Generation ◽  
Three Phase Inverter

Three phase double mode inverter system was researched in this paper, whose input was battery bank system with PV generation. This system can be operated in stand-alone mode by connecting to local load and also in grid-connected mode by paralleling with grid. When in stand-alone mode, system worked as voltage source, while when in grid-connected mode, the output current of inverter was controlled following with grid. A transition algorithm to restrain current inrush and fast detection of switch and grid status make sure the seamless transition between grid-connected and stand-alone. This inverter system has advantage of simple structure and easy to implement, so that it was appropriate for micro-grid. .

A Generalized Three-Phase Multilevel Current-Source Inverter Topology

2011 ◽  
Vol 88-89 ◽  
pp. 373-378
Author(s):  
Jian Yu Bao ◽  
Wei Bing Bao ◽  
Zhong Chao Zhang
Keyword(s):  
Control Strategies ◽  
Current Source ◽  
Voltage Source ◽  
Output Current ◽  
Current Source Inverter ◽  
Multilevel Structure ◽  
Three Phase ◽  
Dc Current ◽  
And Control ◽  
Inverter Topology

A generalized three-phase multilevel current-source inverter (MCSI) topology is proposed by implanting the generalized N-level current cells into a three-phase MCSI topology which is derived from the three-phase multilevel voltage-source inverter (MVSI) topology through dual conversion. In the generalized three-phase MCSI topology, each intermediate dc-link current level can be automatically balanced without adding any external circuits, thus a true multilevel structure is provided. Output current of each phase is independently modulated because of being supplied with two DC current-sources. This allows the wealth of existing knowledge relating to the operations, modulations and control strategies of multilevel VSI to be immediately applied to such multilevel CSI. Simulation results of 5-level and 7-level CSI systems are presented to verify the proposed three-phase MCSI topology.

Application of Zero-Vector Control to Three-Phase Inverter

2012 ◽  
Vol 591-593 ◽  
pp. 1687-1690
Author(s):  
Jeng Yue Chen ◽  
Tsung Cheng Chen ◽  
You Sheng Chen ◽  
Gwo Jen Chiou
Keyword(s):  
Vector Control ◽  
Simulation Software ◽  
Digital Design ◽  
Switching Loss ◽  
Output Current ◽  
Phase Inverter ◽  
Three Phase ◽  
Hysteresis Controller ◽  
Three Phase Inverter ◽  
Zero Vector

In this paper, a new application of three-phase inverter using zero-vector control is proposed. In order to control the amplitude of output current, the d-q axis coordinate transformation, hysteresis controller and space vector strategy are adopted. Besides, the frequency of output current also can be adjusted by zero-vector control. Therefore, the proposed inverter has lower switching loss, higher system efficiency and better dynamic response. Use VisSim simulation software and TI TMS320F28335 chip to implement the proposed control strategy. The controller has several advantages such as easier to control, smaller circuit size and fully digital design etc. Finally, the experimental results are compared with the proposed theory for verifications.

scholarly journals Frequency-Domain Characteristics of Series DC Arcs in Photovoltaic Systems with Voltage-Source Inverters

2020 ◽  
Vol 10 (22) ◽  
pp. 8042
Author(s):  
Jae-Chang Kim ◽  
Sang-Shin Kwak
Keyword(s):  
Current Data ◽  
Frequency Characteristics ◽  
Frequency Fluctuation ◽  
Voltage Source ◽  
Phase Inverter ◽  
Three Phase ◽  
Arc Current ◽  
Frequency Fluctuations ◽  
Single Phase Inverter ◽  
Three Phase Inverter

In this study, the frequency characteristics of series DC arcs are analyzed according to the types of frequency fluctuations caused by inverters in photovoltaic (PV) systems. These frequency fluctuation types used in analysis include centralized frequency fluctuations by three-phase inverter, spread frequency fluctuations by three-phase inverter, and centralized frequency fluctuations by single-phase inverter. To collect arc current data, the frequency fluctuations are generated by inverters in the arc-generating circuit, designed by referring to UL1699B, and the arcs are generated by separating the arc rods of the arc generator. The frequency analysis of the arc current data, collected using an oscilloscope, is conducted using MATLAB. From the results of the frequency characteristics analysis, it is confirmed that the frequencies in the range from 5 to 40 kHz increase after arc generation regardless of the type of frequency fluctuation. In addition, the smaller the current, the greater the increase in frequencies between 5 and 40 kHz after arc generation. Further, in case of arc currents with centralized frequency fluctuations, for larger switching frequencies, the 5 to 40 kHz components increase to a greater extent after arcing.

scholarly journals SOGI-based Flexible Grid Connection of PV Power Three Phase Converters under Non-ideal Grid Conditions

2020 ◽  
Vol 10 (1) ◽  
pp. 5195-5200
Author(s):  
R. Abbassi
Keyword(s):  
Current System ◽  
Voltage Source ◽  
Voltage Fluctuations ◽  
New Approach ◽  
Grid Connection ◽  
Three Phase ◽  
Zero Sequence ◽  
Bus Voltage ◽  
Unbalanced Grid

This paper proposes a control strategy of improving the power quality of the energy exchanged between a photovoltaic generator (PVG) and an unbalanced grid. A voltage source inverter (VSI) allowing the control of the zero-sequence during unbalanced regimes is proposed. A Second-Order Generalized Integrators-Based Approach (SOGI-BA), which suitably fits with the network's imbalances while ensuring the perfect isolation of the PVG from the adverse effects of the imbalance, is investigated. The investigation will focus mainly on three control objectives: the generation of a balanced current system, the active and reactive power's dependent control, and the elimination of the second frequency DC bus voltage fluctuations. The performance of this new approach is approved by various tests via MATLAB environment simulations.

Composite Islanding Detection Method of Grid-Connected Photovoltaic Generation System

2013 ◽  
Vol 339 ◽  
pp. 574-578
Author(s):  
Guo Zhao ◽  
Xue Liang Huang
Keyword(s):  
Detection Method ◽  
Islanding Detection ◽  
Generation System ◽  
Photovoltaic Generation ◽  
Three Phase ◽  
Reactive Current ◽  
Environment Simulation ◽  
Simulation Results ◽  
Pv Generation ◽  
Three Phase Inverter

Islanding detection is an important issue for grid-connected photovoltaic (PV) generation systems. The paper puts forward a new composite islanding detection method combining active current disturbance and reactive current disturbance. This islanding detection method for three-phase inverter is simulated in the Matlab/Simulink environment. Simulation results show that, when the inverter output and the load power are balanced, the new islanding detection method can detect islanding quickly with little influence on the power quality.

Simulation and Experiment of Three-Phase Inverter Based on SVPWM

2010 ◽  
Vol 29-32 ◽  
pp. 709-715
Author(s):  
Zhi Hong Wu ◽  
Guo Qiang Chen ◽  
Yuan Zhu ◽  
Guang Yu Tian ◽  
Liu Qun Fan
Keyword(s):  
Voltage Drop ◽  
Simulation Models ◽  
Voltage Source ◽  
Power Devices ◽  
Phase Inverter ◽  
Light Load ◽  
Three Phase ◽  
In Series ◽  
Simulation And Experiment ◽  
Three Phase Inverter

Aiming at the simulation of the three-phase inverter and SVPWM, the paper introduces their principles. A new method to build SVPWM simulation block in MATLAB/Simulink is proposed. The on-voltage-drop of the power devices is taken into account; the switch and diode are modeled as the connection in series of a resistance and a voltage source in simulation. The simulation and experiment results verify the correctness of simulation models, and show that the on-voltage-drop of the power devices has effects on the phase current and phase/line voltage, especially when the inverter works at a light load state.

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