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This paper presents a dual-buck full-bridge inverter (DBFBI) with different inductor structures. All power devices operate at each half line cycle, and the freewheeling current flows through the independent diodes instead of the body diodes of the switches. Shoot-through problem does not exist. However, the DBFBI has four inductors, so the weight and volume of the inverter may be large. In order to...
This paper describes this development of a test platform of a grid-connection PV station. Essentially this entire platform involves the integration of a Personal computer (PC), a Dc power source, a power analyzer, an AC load and an analog grid to create a grid-connection PV system and to test. This new system boasts of high accuracy measurements coupled with the commercial viability of low cost. In...
As the output power of the photovoltaic (PV) cell changes with the insolation , PV cell temperature and cell voltage changing. It is necessary to control the operating point to draw the maximum power of the PV cell in order to increase system efficiency. In this paper, two-level single phase PV grid-connected system is designed, which mainly includes PV cell, BOOST circuit, inverter, filter and the...
According to the hardware configuration used for HVDC control system from ABB, converter firing control (CFC) section is modeled based on PSCAD/EMTDC. All the functional modules of practical system which is controlled by ABB control system are reserved to make the dynamic response characteristics closer to the practical project. Single-phase to ground fault of AC transmission line is applied. The...
Photovoltaic inverter's well all-weather featured and inherent characteristic it requires unique high reliability and high efficiency. In this paper, Dual-BUCK grid-connected inverter as the research objective, for the present study SPWM control and hysteresis current control algorithm shortcomings, a least squares fixed switching frequency hysteresis current control algorithm for Dual-BUCK grid connected...
In this paper, a new circuit implementation of Carrier Phase Shifting Sinusoidal Pulse Width Modulation(CPS SPWM) for grid connected cascaded multilevel inverter is presented. The SPWM control scheme is realized with only a single Field programmable gate array (FPGA) chip EP1K from ALRERA, Inc. and the programming language is Very High Speed Integrated Circuit Hardware Description Language (VHDL)...
Solar energy is rich, ideal for the sustainable use of renewable clean energy, solar photovoltaic system utilizes photovoltaic effect of solar cells and transforms the solar radiation directly into electricity generation. In the world most countries focus on such new power generation form. In recent years China has made great progress in using solar energy and photovoltaic technology. The production...
Based on conventional hysteresis grid-connected inverter current control, a fuzzy hysteresis band width grid connected current control was presented in this paper, and a whole fuzzy hysteresis band width for PV power grid connected current controller has been designed. Simulations were performed on Matlab/Simulink software, results of simulations show that the proposed control algorithm have smaller...
A novel single-phase inverter source based on advanced modulation wave reconstruction pulse width modulation (AMWR-PWM) technology is proposed. The causes of the harmonic production and the impact of balanced and unbalanced systems on the characteristics of the inverter source are analyzed in detail. As a result, a novel method of harmonic elimination of the PWM is presented. The novel PWM technique...
This study proposes an islanding detection method for use of grid-connected inverter of distributed renewable generation system. The proposed method is based on two indices: the rate of change of voltage (ROCOV) and the rate of change of frequency (ROCOF). When an inverter is grid-connected, the ROCOV and ROCOF are lower than the threshold values. In contrast, as an islanding occurs, the ROCOV or...
In this paper, The rectifier and inverter in three phase PWM drive motor system is studied. Based on Fourier Transform, Mathematical models of common mode noise source of rectifier are builded. A general modeling method for common mode noise source of inverters is presented based on the principle of the double Fourier integral. PWM carrier wave and fundamental wave function are described by two independence...
The PWM technology of multiphase inverter is one of the most important technologies in multiphase drive system. In this paper, a novel space vector PWM with low harmonic and low switching loss for five-phase inverter is proposed by applying the voltage vectors skillfully. Comparing with the traditional space vector PWM (TSVPWM), another two middle vectors is adopted to implement the SVPWM in the proposed...
Aimed at the fluctuate characteristics of isolated wind power system export voltage and frequency, apply the Space Vector Pulse Width Modulation technology, design the control system of small capacity converter. Build the rectifier and inverter model in Matlab/simulink environment and simulated. The results show that the converter base on the control of SVPWM can dampen the wind power system output...
The research of control and protection in Micro grid technology is key to distributed generation(DG), such as wind power, Photovoltaic (PV) power generation, tidal power and so on. Through DC-AC converter or AC-DC-AC converter the renewable energy supply power to the loads, so the power electronics technology has a decisive role in DG and Micro grid technology based on renewable energy. In this paper,...
A novel main circuit topology of current quality compensator is proposed in this paper, which is composed of PWM rectifier and cascade H bridge inverter. The three phase inverters are decoupling controlled. PWM rectifier is adopted to maintain the dc-bus voltage stably for the device, the later inverter is composed of cascade H-bridges. The inverter side is controlled by carrier phase shifting and...
The removal of a transformer in grid-connected PV systems can reduce size, weight and costs. When no transformer is used, a galvanic connection between the grid and PV panels exists and leakage current appears due to parasitic capacitance. In this paper, the principle of leakage current is analyzed from equivalent resonant circuit and an equation is derived to evaluate the current. It will be shown...
A novel and practical multi-loop control strategy for photovoltaic (PV) inverters is presented. In which the double close-loop control structure of digital PID voltage and current instantaneous value is adopted based on the cross feedback decoupling control and load current feed-forward control. In addition, in order to improve accuracy of output voltage, a close loop control structure of the output...
One of the major problems in electric power quality is the harmonic contents. This paper focuses on elimination (reduction) of harmonics in a H-bridge multi-level voltage-source inverter. Here the basic concept is to eliminate specific harmonics with a proper choice of switching angles. This technique is very efficient for improving the multi-level inverter output voltage quality. In This paper, Generalized...
An investigation was conducted to install wind farm to supply electrical power to the village of Ras Munif, the highest elevation in Jordan. The village installed capacity load was found to be 500 kW. A 25 windmills, 20kW each, forming the wind farm was found to be the best choice to supply the village with 100% of its needed power. The windmills will be spaced 50 meters along an unobstructed continuous...
This Paper puts the power system into an affine coordination system, and then proves the traditional coherency of power system a special model of differential coherency through the theorems relate to. Two new notions of power system coherency are present, as well as the judgement of the notions. Finally, the paper demonstrates the usage of the notions according to the simulation and physical experiment...
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