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This paper presents a control scheme for a three-phase grid-connected photovoltaic (PV) system operating in a grid connection and isolated grid mode. Control techniques include voltage and current control of grid-connected PV inverters. In the grid-connected mode, the grid controls the amplitude and frequency of the output voltage of the PV inverter. The inverter operates in the current control mode...
This paper presents a system of grid connected photovoltaic (PV) to the monitoring point of maximum power (MPPT). The voltage source inverter (VSI) is connected between the dc output of photovoltaic system and ac grid. The control strategy applied is based on theory of instantaneous reactive power (p-q theory). According to this proposed PV system send active power to the grid at the same time the...
This paper investigates the control problems of the single-phase grid connected to the photovoltaic system through an inverter with LCL filter. The control objectives are threefold: (i) forcing the voltage in the output of PV panel to track a reference signal provided by the MPPT block; (ii) regulating the DC link voltage to ensure the power transferring from the source to the grid; (iii) providing...
This paper presents an overcurrent protection scheme for a stand-alone PV system consisting of PV array, DC-DC converter, DC-AC inverter, relay and circuit breaker to fed an irrigation load. This scheme is based on a numerical relay which is composed of rms current converter, integrator, comparator, low-pass filter and reset logic. The model of the system is simulated using MATLAB/Simulink. The performance...
As a nonlinear control strategy, sliding mode control (SMC) is developed in electrical drivers. Although many new SMC methods have been devised, the research on its response speed and disturbance is still not so much. Consequently, this article established a MPPT controller based on SMC in PV system and studied the controller's performance when light flicker emphatically. Moreover, analysis on the...
In this paper a new technique of Z-Source Inverter (ZSI) based Solar Power Generation is developed and simulated using MATLAB-Simulink toolboxes. The Photovoltaic solar cells are better option for converting solar energy into electrical energy. Initial high cost and low efficiency PV cells have not yet been a fully attractive alternative for electricity users. For improving the performance, Z-Source...
As the electric power supplied by solar array is dependent upon the isolation, temperature and array voltage, it is necessary to implement Maximum Power Point Tracking (MPPT) in order to move the solar array operating voltage close to the peak power point, therefore drawing the maximum power from the solar array. The solar array shall be integrated with a DC-DC converter and a control algorithm to...
This paper is mainly to develop a grid-connected photovoltaic simulation system with maximum power point tracking (MPPT) function using MATLAB software in order to simulate and predict the behaviors of the real photovoltaic system. An engineering model of the photovoltaic (PV) cell is first established and then combined with an MPPT algorithm, as well as models of an MPPT controller and a DC-DC converter,...
Photovoltaic (PV) solar farms are being increasingly utilized for producing energy, worldwide. To integrate such solar farms with the grid, a thorough technical study is required in terms of their impact on system voltage, power quality, response to faults and short circuit contributions, etc. These studies require a complete modeling of the PV solar system in an electromagnetic transient software...
The digital controller is the “heart” of the PV system: it will track the maximum power point (MPP) and regulates the output current to meet the utility inter-connection standards. This paper introduced a new approach “model based design” to develop digital controller for PV inverter. This design methodology filled the gap between computer simulation and hardware implementation of the digital controller...
An innovative methodology for the development of a commercial low-power single-phase transformerless inverter for grid connected photovoltaic (PV) systems is described. Computer-Aided Engineering (CAE) tools like MATLAB/Simulink™, PLECS™ and dSpace/TargetLink™ allow fundamental steps, such as: physical modeling and simulations, innovative control algorithms design and testing, preliminary hardware...
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