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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)
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)
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 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)
Nowadays, finding the optimum locations of energy storage systems (ESS) and distributed energy resources (DER) in a microgrid is very controversial. In this paper, a novel method based on harmony search algorithm (HSA) is proposed to find the optimum locations of ESSs in a specified microgrid. The microgrid has renewable energy resources, and it is(More)
Coordination of different relays in transmission systems is an important issue in relays application. In this paper, the over-current and distance relays are coordinated through the Imperialist Competitive Algorithm (ICA) considering time setting multiplier (TSM) and pickup current of the relays. The proposed method is investigated on a 6-bus network. It is(More)
A Modular DC-DC converter with a high-frequency link and bidirectional power flow capability is presented in this paper. Zero voltage switching (ZVS) operation without using any auxiliary circuit, is one of the most important specifications of the proposed modular DC-DC converter. Also, compatibility for high power applications and less number of switching(More)