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In order to improve power reliability of critical load, distributed generation (DG) should be with intentional islanding operation when utility is outage. This paper proposes a novel control strategy for three phase inverter in DG to realize transferring between grid-tied and islanding modes, which is with an inner inductor current loop and outer capacitor voltage loop in the synchronous rotating...
This paper discusses modeling of a micro-grid with PV-Wind-Diesel generator hybrid system and its operations. The PV system is modeled with a DC/AC inverter with a pre-defined Maximum Power Point Tracking (MPPT) control. Fixed speed induction generator based wind turbines are used to model the wind farm. The diesel generator controls are modeled with droop governor and automatic voltage regulator...
This paper concerned with an advanced practical development of utility grid-tied 3 phase voltage source type is instantaneous current controlled inverter with minimized pulse switching number-based pulse modulation strategy. It is a key issue that newly-proposed utility inverter incorporates a new conceptual extended neutral point voltage shifting module into the d-q synchronous rotating cordinate...
This paper proposes a grid-connected PV system based on the series Z-Source inverter, and also proposes an indirect DC-link voltage control method for the system. The operation principle of the system is presented. The current control strategy is also designed, which makes the output current synchronize with grid voltage, thus the system could transform power to utility grid with a unit power factor...
This paper introduces a single-stage, single-phase, inverter, for maximum efficient photovoltaic grid connection. The inverter is based in a full-bridge converter where a few diodes and one inductor have been added to enable single stage operation. The new topology provides an additional buck-boost converter function at the bridge level in order to extract the maximum power from photovoltaic (PV)...
A power conversion system (PCS) for photovoltaic power generation system is composed of the DC/DC converter and the DC/AC inverter. To maximize power generation, DC/DC converter operated with MPPT (Maximum Power Point Tracking) algorithm and the PCS has been developed by the method of transformer tab change. DC/AC inverter controls DC-link voltage and grid current. But, single phase grid has 120 Hz...
Distributed generation technologies such as photovoltaic, fuel cells and micro turbines are emerging. However, these sources require interfacing units to provide the necessary crossing point to the grid. The cores of these interfacing units are power electronics technologies such as inverters since they are fundamentally multifunctional and can provide not only their principle interfacing function...
This paper dissertates the advantage of wind-solar complementary power supply system from the complementarities of time and region. It describes the development of wind-solar complementary single-phase sine wave power inverter and presents its hardware structure, operation principle, and intelligent control method to design for charging and discharging. Some key techniques such as the circuit topology...
This paper presents the design and implementation of converters for grid-connected single-phase photovoltaic energy conversion system. In order to provide the functions of the energy management and the load distribution, the system is combined with the photovoltaic cells and utility network. Due to that the output voltage and current of the photovoltaic cells are easily changed by light and load fluctuations,...
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...
Awareness of power quality is highly increased in a sensitive industry, where the standardization and performance is an important aspect. The connection of wind turbine to the grid affectpsilas the electric grid power supply quality. Therefore it is necessary to maintain the power quality norm at the interface of the grid from the disruptive effect caused by wind turbine such as voltage fluctuation,...
This paper discusses a new control scheme of a three-phase grid-connected wind energy conversion system (WECS). The control incorporates a maximum power point tracker (MPPT) for optimal use of the wind resource. In addition, reactive power compensation of the electric grid is included, operating simultaneously and independently of the active power generation. The wind turbine generator (WTG) consists...
A household wind generation system connected with the grid are advanced in this paper, in which a diode rectifier, a boost DC/DC converter and a single-phase inverter paralleled with the grid are utilized, and a grid-connected operation mode without power injection is adopted. A double-loop control method with a current loop and a voltage loop is applied to the inverter so that the inverter feed no...
This paper presents the modeling and design of a closed-loop controller for a Z-source inverter. The Z-source inverter is a recently proposed single-stage power converter, and it is capable of operating in both buck and boost modes. Hence, this inverter gives an economical solution for power conversion in distributed generation (DG) applications, particularly by eliminating the need for a two-stage...
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