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Normally fuel cell based power supply system needs a power conditioner to convert the low DC output voltage generated by the fuel cell into usable AC voltage for any practical application. For proper power conditioning design fuel cell electrical characteristics as well as customer requirements must be taken into account. Therefore, in this paper, a practical design methodology for two-stage power...
In recent years, various types of gas-fueled combined heat and power (CHP) systems have been developed and introduced into sites such as hospitals, hotels, commercial buildings, district heating & cooling centers, factories, etc., to increase energy savings and reduce greenhouse gases. Typical components integrated into CHP systems are gas engines (GE), gas turbines (GT), and fuel cells (FC);...
Nowadays high quality power is essential for medical, research and industrial applications to produce good quality results and analysis. In this paper, an attempt has been made to improve the quality of power. A single phase seven level cascaded multi level inverter with identical dc supply is designed to reduce the harmonic components of the output voltage. Genetic algorithm optimization technique...
This paper describes the development of a 3-phase line-interactive DVR with a new sag detection algorithm. The developed detection algorithm has a hybrid structure composed of an instantaneous detector and the RMS-variation detectors. The source voltage passes through the sliding-window DFT and RMS calculator, and the instantaneous sag detection part. If instantaneous sag is detected, the RMS variation...
This paper focuses on two power quality effects that are noticed with power electronic appliances. One effect is a harmonic oscillation by inverters of photo voltaic systems because they bring a high parallel capacitance to the grid and negative output impedance. The other effect is a sub-harmonic oscillation due to the negative differential impedance of constant power loads. This paper discusses...
Nowadays high quality power is essential for medical, research and industrial applications to produce good quality results and analysis. In this paper, an attempt has been made to improve the quality of power. A single phase seven level cascaded multi level inverter with identical dc supply is designed to reduce the harmonic components of the output voltage. Genetic algorithm optimization technique...
Renewable energy resources available locally are ideally suited for providing electricity supply in remote areas. This report describes design and layout of a special single phase supply system with high voltage quality and low power electronics expenditure through application of a special quasi-eight-level inverter output voltage shape at four-level-inverter circuit configuration. Simulation results...
The voltage source inverter (VSI) of an uninterruptible power supply (UPS) is a system where the main objective is to obtain a high quality output sinusoidal voltage with independence on the output load. For this reason, it includes an output LC filter. The presence of the filter increases the complexity of the controller design thus it is necessary to evaluate the performance of the control strategy...
Photo Voltaic (PV) generators today find application in the domestic field, where the decentralized power conversion concept has proven to be more advantageous than the conventional string architecture. According to the decentralized power conversion concept, PV modules are connected to a single phase AC grid through a two stage converter composed of a DC/DC converter and an inverter. The DC/DC converter...
In recent years, multilevel technology has become an effective and practical solution for moderate and high voltage application field. In all multilevel technology, cascade multilevel inverters have become the major circuits used in power quality conditioners. Evidently,the voltage balancing problem of DC capacitors of cascade inverters is a key problem to the power quality conditioners. This paper...
Due to the stochastic characteristic of photovoltaic (PV) generation, energy storage devices are indispensable to smooth the power flow and provide the electric energy with high quality. In this paper, an integrated DC/DC converter is proposed to realize high performance interfaces for PV array, battery and load. This converter consists of a boost converter for the PV array and a buck/boost converter...
Power electronic converters are commonly used for interfacing distributed generation systems to the electrical power network. This paper deals with a single-phase inverter for distributed generation systems requiring power quality features, such as harmonic and reactive power compensation for grid-connected operation. The idea is to integrate the DG unit functions with shunt active power filter capabilities...
The impact of large scale integration of photovoltaic energy source in the electrical power distribution network was assessed in many research projects before. However, the conclusions can not simply be applied in case of large scale integration of photovoltaic energy source on the low voltage distribution line due to the fact of simultaneous electricity production within less than one square kilometer...
Power converters are an important component of microgrids. They help interconnect renewable sources and energy storage systems in a microgrid. In addition, power converters can provide ancillary services to improve power quality within the microgrid and facilitate interconnection with the electrical power system. The size and the number of the power converters required will depend on the fluctuating...
In this paper an UPQC (Unified Power Quality Conditioner) with a FLFB (Four-Leg Full-Bridge) inverter used as a Shunt Active Filter is presented. The UPQC works in a three-phase four-wire electrical system in order to compensate for nonlinear and asymmetrical loads, and disturbances in the power supply voltage. For the generation of reference currents for the FLFB the instantaneous power theory in...
Photovoltaics (PV) is considered a non-controllable power source which can create overvoltages in distribution feeders during periods of high generation and low load. This is usually prevented by limiting the penetration level of PV to very conservative values, even if the critical periods rarely occur. This paper discusses the use of droop based active power curtailment (APC) techniques for overvoltage...
The penetration of distributed generation is increasing to assist main power plants worldwide. An efficient strategy of grid control integration, to interconnect the DG systems to conventional power systems, is required to improve the power quality and reliability (PQR). The main task of the interconnected system is to control and maintain frequency and voltage of the power system in an acceptable...
This paper deals with the problem of reactive power and harmonics in a standard medium voltage (MV) distribution network. It presents the design of a shunt active filter implemented with a multilevel current source inverter (MCSI) connected to the medium voltage level of a power distribution system. The proposed MCSI is made by identical modules where all inductors carry the same amount of current...
This paper reports on the modeling and simulation of a stand-alone photovoltaic (PV) plant with maximum power point tracking (MPPT) feature and dedicated battery storage. The overall plant comprises the PV module, battery bank, MPPT module, controller, inverter and a resistive load. The load is supplied by both the PV and the battery bank. The fluctuations in the output of the PV module are controlled...
Fault tolerance of adjustable speed drives and ride-through capabilities against voltage sags, swells and under voltages have been widely addressed in the past. However, the research activities in these fields have been always focused only on conventional sensored motor drives. In this paper, a detailed analysis regarding the robustness of sensorless controlled electrical drives to inverter faults...
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