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Electricity in remote communities is usually provided by diesel power plants at relatively high costs. This issue can be addressed with the addition of renewable energy sources such as wind and PV. However, due to the intermittent and fluctuating characteristics of the power produced by these sources, the dispatch of the diesel gensets for operation with variable (droop-based) frequency, high efficiency...
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,...
In recent years, distributed generation (DG) and renewable energies source (RES) are attracting special attention to distribution systems. Renewable energy such as photovoltaic system and wind turbine generator are used as the sources of green energy. However, the large amount of distributed generation causes voltage deviation beyond the statutory range in distribution systems. This paper proposes...
The output voltage and current of renewable energy sources such as Photo- voltaic are not controlled. Consequently PV- Grid interface system is employed condition output voltage and current into the grid. This call for efficient and well designed control strategies to ensure reliability, stability and quality power output. This paper proposes nine- level cascaded NPC/H-bridge inverter as the PV- Grid...
With the application of renewable energy, the distributed energy network is researched and developed widely. This paper designed the distributed stand-alone PV generating system with battery backup. The coordinated MPPT control of several parallel modules is designed to increase PV utilizing efficiency. The multi-variable multi-loop controller is designed to control the currents of each module, the...
Cascaded multilevel inverters appear as a promising solution in the development of AC power supplies for renewable energy sources, particularly those with DC output. This paper addresses the development of a distributed generation system consisting of a multilevel inverter supplied by fuel cells and controlled by fuzzy logic. The proposed system operates in grid-connected as well as in stand alone...
Renewable energy sources has become more commonplace source to produce electricity, fuel, and heat, reflecting the major threats of air pollution, exhaustion of fossil fuels, and the environmental, social and political risks of fossil fuels and nuclear energy. Fuel cells will start out as a high-cost technology, supplying electricity and gradually become more attractive to mainstream electricity users...
An alternative energy supply to assist the main power stations in future power systems is expected to be distributed generation (DG), which is based on renewable energy sources (RESs). However, the rapid growth of power supply systems must also improve its reliability and supply quality. Interconnecting the DG systems to each other and to conventional power systems to operate in parallel in order...
A control system of grid-connected power conditioner for renewable energy is proposed and studied. The proposed control system consists of voltage and current control strategy, compensation control strategy and anti-islanding control strategy, which can be considered as a solution of the control strategy for renewable energy generation system. The power conditioner with the proposed control system...
Small hydro (SH) / photovoltaic (PV) hybrid power system (HPS) is a clean and economic way of renewable energy power generation, which has a good complementary according to local resources distribution features. Operation characteristics of SH and PV generation system are analyzed in detail and a novel control strategy is proposed in this paper. The PV generation system is designed to have the same...
This paper proposes a multi-function control system for single-phase bidirectional PWM converters for renewable energy system applications. A common inner AC current-loop between the different modes helps to facilitate a seamless transition between them, where several individually designed outer loops alternatively perform the different regulation tasks, namely AC voltage, DC voltage, and DC current...
A typical micro-grid with multi-energy generators (MGMEG) is composed of renewable energy generation systems including wind, photovoltaic, biomass etc., and fuel cells, energy storages and local loads. The most important feature of a MGMEG is its ability to separate and isolate itself from the utility system, during a utility grid disturbance. Power electronic interfaces, typically voltage source...
Due to the rapid increase in global energy consumption and the diminishing of fossil fuels, the customer demand for new generation capacities and efficient energy production, delivery and utilization keeps rising. Utilizing distributed generation, renewable energy and energy storage can potentially solve such problems as energy shortage and global warming. A promising structure to interconnect these...
In the last years the power system industry is rapidly changing. The traditional centralized systems, which grew as a result of large-scale integration, are going to be replaced by the dispersed or distributed generation that is situated closer to the consumers. The future power supplying will be done by the combination of well-established central power networks and micro grids (MG), with the maximal...
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