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Keywords: Distributed generation (DG) allocation Long-term scheduling Load variations Particle swarm optimization Power losses minimizing Radial distribution networks a b s t r a c t This paper proposes a new long term scheduling for optimal allocation and sizing of different types of Distributed Generation (DG) units in the distribution networks in order(More)
Various topologies and modulation strategies of multi-level inverters have been proposed for utility and drive applications. This paper studies multi-carrier PWM methods for asymmetric multi-level inverter. Phase disposition, phase opposition disposition and alternative phase opposition disposition methods are discussed considering switching frequencies,(More)
A microgrid is composed of distributed power generation systems (DGs), distributed energy storage devices (DSs), and loads. To maintain a specific frequency in the island mode as an important requirement, the control of DGs output and charge action of DGs are used in supply surplus conditions and load-shedding and discharge action of DGs are used in supply(More)
The development in the technology of power semiconductors results in their application in FACTS devices, static switches, hybrid switches, HVDC, and high power converters. Since the nominal current of such devices does not satisfy high power applications, in order to increase the current ratings, switches should be paralleled. In this paper, the behavior of(More)
Reliability plays an important role in power electronic systems by which the number of system failures, repair costs, guarantee and etc are estimated. In this paper first, a boost power factor correction (PFC) converter is simulated in discontinues conduction mode (DCM) and continuous conduction mode (CCM) under different output power ratings. For these(More)
A hybrid Wind/Photovoltaic/hydrogen/fuel cell generation system is designed to supply power demand. The major components of the system i.e. wind turbine generators, photovoltaic arrays and DC/AC converter may be subjected to failure. Also, solar radiation, wind speed and load data are assumed to be entirely deterministic. The goal of this design is to use a(More)
A microgrid (MG) as a main component of the smart grid integrates Distributed Generation System (DGS) to supply power of local loads. In other words, MG is a unit of integration of the DGs and loads which can operate either connected to or isolated from the main grid. Coordinated control of DGs in MGs is one of the technical difficulties. In this paper, a(More)
Micro-grids (MGs) are active networks known as an effective solution for the control of grids including high levels of Distributed Generation (DG). In off-grid MGs, DGs connected to Voltage Source Inverters (VSIs) enroll as controllers of voltage and frequency. These VSIs should share power between the DGs fairly. A precise power sharing may increase(More)
Distributed Generation (DG) is expected to play an increasingly significant role in power generation in coming years. In Iran, more attention is recently paid to the Micro-Turbines (MTs), since 20% of the world's gas resources are believed to exist in Iran. A MT unit consists of a gas turbine engine, a permanent magnet generator, a 3-phase AC/DC rectifier(More)
Recently, voltage source inverters have been applied in a wide range in order to stabilize Microgrids (MGs). These inverters are controlled based on conventional droop method. This method satisfies power sharing between the inverters in steady state. Besides, it enrolls as the frequency controller in inverter-based systems such as MG. In this paper, a(More)