Design Of Grid-connected Photovoltaic System Research Articles

Optimal design of grid-connected photovoltaic system using grey wolf optimization

Grid-connected photovoltaic systems have been widely utilized as means of renewable energy-based electricity supply worldwide. Nevertheless, one of the major issues in their implementation is optimal system design, also associated to system sizing. An undersized or oversized system components could compromise the technical benefits of the systems. Therefore, this paper discusses a Grey Wolf Optimization (GWO) for optimizing a grid-connected photovoltaic system design. The optimization problem was devised based on single objective optimization with models of photovoltaic module and inverter set as the decision variables and specific yield transcribed as fitness value that needs to be maximized. Before optimization, an iterative-based sizing algorithm was formulated to determine the optimal module and inverter that give the highest specific yield using a non-computational intelligence approach. Later, GWO was employed to determine the maximum specific yield by choosing the optimal model of PV module and inverter. The results showed that GWO was able to produce same specific yield obtained by iterative-based sizing algorithm. Additionally, GWO was observed to be about 11.3 times faster when compared with the iterative approach. When comparing with particle swarm optimization and genetic algorithm, GWO was discovered to produce higher specific yield with relatively similar computation time.

Design of Grid-Connected Photovoltaic System

This paper presents a grid connected photovoltaic system (PV) with a proposed high voltage conversion ratio DC-DC converter which steps up the variable low input voltages of photovoltaic module to the required DC link voltage. This voltage is applied to an H-bridge inverter which converts DC voltage into AC voltage and a low pass filter is used to filter the output. By adjusting the duty ratio of switches in DC-DC converter, the magnitude of inverter’s output voltage is controlled. The frequency and phase synchronization are ensured by a feedback signal taken from the grid. In this way, inverter is synchronized and connected with the grid to meet the energy demand. The PV system has been designed and simulated.

Pre-installation Design Simulation Tool for Grid-connected Photovoltaic System Using Iterative Methods

Abstract The paper presents a simple technique in pre feasible design of grid-connected photovoltaic systems for the application in all energy sectors. A user-friendly simulation tool named Pre-Installation Design for GCPV (PIDGCPV) was developed to assist PV installer or any energy consumer in preliminary evaluation on PV system sizing to avoid over/under size of system. The developed simulation tool uses an iterative method embedded in Macro Excel integrated with Microsoft Visual Basic application. The simulation tool covers three constraints, which are space, energy requirement and budget. The iterative method is used for the selection of optimal number of photovoltaic (PV) module and inverter for a proposed system. In addition, a database for PV modules, inverters, and meteorological data for each state in Malaysia is also embedded in the software. The analysis shows straightforward comparison between the simulated result and the actual installed data based on the constraint selection. It indicates that the capability of the developed simulation tool is giving higher accuracy and can be used as pre installation design tool.

Analysis and Design of Grid-Connected Photovoltaic Systems With Multiple-Integrated Converters and a Pseudo-DC-Link Inverter

An architecture of multiple-integrated converter modules sharing an unfolding full-bridge inverter with a pseudo dc link (MIPs) is proposed for grid-connected photovoltaic systems in this paper. The proposed configuration can improve the power conversion, the control circuit complexity, and the cost competitiveness. The proposed MIP is composed of distributed flyback dc-dc converters (DFCs) and an unfolding full-bridge inverter with an ac filter. The DFCs can eliminate the shading effect by using the individual maximum power point tracking. In conventional flyback-type single-phase utility-interactive inverters, discontinuous conduction mode and boundary conduction mode are popular because of the inherent constant current-source characteristics more desirable for grid connection and of the simple procedures for the controller design. However, the operating mode suffers from a large current stress of the circuit components, which leads to the low power efficiency. To avoid this, the DFCs operate under continuous conduction mode that allows reduced current stresses and increased power efficiency, as well as low material cost. The current control loop of the converters employs primary-side regulation contributing to improvement of dynamics as well as the cost reduction significantly due to the elimination of the high-linearity photocoupler device. Development of a new dc-current loop that maintains the level of dc-current injection into the grid within the levels stipulated by IEEE 1547 will be dealt as well. The performance validation of the proposed design is confirmed by experimental results of a 200-W hardware prototype.

Grid-Connected Photo Voltaic System Design for Koya Software Engineering Department in Iraq

The depletion of fossil fuel resources on a worldwide basis has necessitated an urgent search for alternative energy sources to meet up the present day demands. Solar energy being a clean, inexhaustible and environment-friendly potential resource among all renewable energy options. It uses Photovoltaic system to change the sunlight directly to electricity. Photovoltaic system is one of the attractive candidates for green power generation. The system developed in such a way that it can be connected to the Grid system to provide the demand load. From this point the term grid-connected PV system was started. In this paper the Grid-Connected PV system designed to supply 20% of the load demand for the software engineering department of Koya University in koya city in iraq. The load is calculated by taking the different appliance wattage in the department and the average hours of operation for them in the four seasons of year. Depending on the maximum load demand, the system designed to generate 20% of the peak load which is 30KW. The designed system will integrate with the utility system to form the Grid-connected PV system. The application of the designed system will be the first challenge of generating green electricity in koya city. Keywords—Grid-Connected PV system, Energy consumption, Solar irradiation