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This paper presents a three-phase grid-connected photovoltaic generation system with unity power factor for any situation of solar radiation. The modelling of the PWM inverter and a control strategy using dq0 transformation are proposed. The system operates as an active filter capable of compensate harmonic components and reactive power, generated by the loads connected to the system. An input voltage...
This paper proposes a new technique for connecting PV modules with the grid at high efficiency in case of partial shading. Normally many PV modules connected in series with single unit of dc-dc converter which be affected seriously to a partial shading as the controller disconnects the whole string. Here each PV module is connected with a single dc-dc with high voltage gain converter, and then converters...
In this paper, a single stage buck-boost inverter is proposed for grid connected PV system with a very high voltage gain. The proposed inverter not only boosts DC output voltage of the PV module but also converts it into AC voltage which is required for grid connection. Discontinuous conduction mode (DCM) is employed to achieve unity power factor with the grid voltage and a maximum power point tracking...
This paper presents an intelligent-based sizing algorithm for the design of grid-connected photovoltaic system using evolutionary programming. Evolutionary programming had been used to select the optimal PV module and inverter from pre-developed databases such that the expected technical performance of the design could be maximized. The proposed algorithm, known as evolutionary programming-based sizing...
This paper proposes a three-phase four wire current-controlled Voltage Source Inverter (CC-VSI) for both harmonic mitigation and PV energy extraction. For harmonic mitigation, the CC-VSI works as a grid current-controlling shunt active power filter. Then, the PV array is coupled to the DC bus of the CC-VSI. The MPPT controller employs the Fibonacci search method. The output of MPPT controller is a...
Assigning an acceptable level of power reliability in a security system environment requires a methodical approach to design when considering the alternatives tied to the reliability and life of the system. The downtime for a piece of equipment, be it for failure, routine maintenance, replacement, or refurbishment or connection of new equipment is a major factor in determining the reliability of the...
As an important component of distribution network, micro-grid is the necessarily development trend for future. Micro-grid has greatly improved the random problems of distributed generation (DG). However, DGs, the power electronic equipments inevitably bring about power quality problems, especially voltage flicker and harmonics. This paper tries to study the operating regulations of micro-grid in order...
There is a strong trend in the photovoltaic (PV) inverter technology to use transformerless topologies in order to acquire higher efficiencies. This paper presents a single-phase five-level grid connected PV inverter with a novel dual reference modulation technique. Two reference signals identical to each other with an offset equivalent to the amplitude of the rectified inverted sine carrier signal...
This paper presents the theoretical analysis, design and simulation of a single phase single stage boost dc-ac converter powered from PV array. The main attribute of the boost inverter topology is the fact that it generates an ac output voltage larger than the dc input one, depending on the instantaneous duty cycle. This paper proposes an accurate solar panel simulation to incorporate the temperature...
In recent years, many utilities throughout the world have been moving toward the utilization of renewable energy, e.g. wind power or photovoltaic (PV) which is an alternative, clean and sustainable energy source for the electricity production. This paper focuses on the grid-connected PV systems and their impact on the system transient stability. The modeling of the PV systems developed within the...
Solar energy photovoltaic (PV) generation will play an important role in future power energy structure all over the world. Inverter is an important facility of a PV system. To ensure its safety and quality is a necessary link in developing this technology. The status and prospect of PV power generation especially detection and certification is introduced in this paper at first. Secondly, a detection...
In this paper, electromechanical modeling and simulation of large-scale grid-connected photovoltaic systems developed on commercial simulation software are introduced. Characteristics of PV cells and typical grid-connected control strategies are analyzed and modeled in details. In the end, the compared simulation results of transient stability between conventional generator and PV plant are presented.
This paper concentrates on the modeling and control of three-phase stand-alone photovoltaic (PV) generation system. The system is mainly composed of a solar array, dc/dc boost converter, three-phase inverter, system controller, and an output load. Sliding mode controllers are used for boost converter and three-phase inverter to achieve the maximum power output, regulated DC voltage, and the desired...
This paper presents a discussion on architecture-oriented assurance technology in Micro grid. We analyzed the characteristic of Micro grid from evolutional view, and proposed the concept of architecture-oriented assurance technology in Micro grid from the technology evolution and policy evolution. Technology evolution contained Function Evolution, Role Changing Autonomy and Role Coordination. Policy...
Hydro/photovoltaic (PV) hybrid generating is a novel power generation mode using renewable energy. This paper addresses the studies on the grid operation mode, inverter's parallel control algorithm and storage system design. To ensure stable operation of hybrid grid and play the advantages of hybrid generating system, parallel and interactive operation modes were designed in this paper. With different...
In photovoltaic systems a large amount of electrical connectors has been used in the combination of serial and parallel structures of the modules. Due to the high DC voltages and the aging of the systems, long-lasting arc faults can occur which may cause serious fires. As an initial step to develop sensor-devices for detecting arc faults in photovoltaic systems, a test set-up consisting of several...
High penetration levels of distributed photovoltaic (PV) generation on an electrical distribution circuit may degrade power quality due to voltage sags and swells caused by rapidly varying PV generation during cloud transients coupled with the slow response of existing utility compensation and regulation equipment. Fast-reacting, VAR-capable PV inverters may provide the necessary reactive power injection...
Photovoltaic (PV) arrays are always assembled based on centralized, string and multi-string technology. These complex configurations of PV arrays and non-dependent maximum power point tracking (MPPT) algorithms based on PV arrays but not PV modules lead to the low output power efficiency of PV arrays. In view of the above questions, this paper analyzes the output characteristics of PV arrays under...
This paper proposes a two-stage structure solar inverter topology with maximum power point tracking capability. The control of the solar inverter is digitally implemented using Freescale DSP56F8346, the dedicated photovoltaic intelligent power modules is used for constructing the power stages. In the design process, the circuit component and its parameters are calculated. A prototype is built in the...
In recent years, the increase of energy demand and the problems of fossil-fuel sources due to their environmental pollution and future shortages, have led to the development of technologies need to use non-polluting alternative energy sources such as solar and wind sources. Growing demand, advancements in semiconductor technology and magnetic materials such as high frequency inductor cores, has a...
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