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In this work it is presented a two-phase open-end winding induction motor (IM) driven by an improved current source inverter (CSI). The proposed inverter has independent full quadrant operation, lower DC-link current value, high magnetics power density, 25% more efficient and high AC output voltage waveform quality compared to conventional CSI solutions. A back-to-back AC-DC-AC current source converter...
The authors solve the problem of effective use of renewable energy sources for autonomous electric consumers. A new device for coupling heterogeneous energy sources has been developed. The universal coupling device (UCD) allows to connect diverse AC and DC sources to a 220/380VAC consumer. A 30 kVA UCD prototype is created. The article gives a UCD brief description and presents the results of the...
Due to the increasing energy demand there is a need of energy storage and advanced power conversion system. Energy which are available from the renewable energy sources can be efficiently store and can be convert to feed load as per the requirement. There are some power quality issues or poor voltage regulation where the load is supplied by renewable energy source. Therefore it is required to design...
This article presents created experimental stand for wireless inductive system for electric vehicles (EV) batteries charging and investigation of the main problems for moduls integration in the system for effectivnes energy transfer in the large exigenses of the batteries for electric vehicles. Flexible control of the high frequency (HF) inverter limited from resonant conditions of the flexible load...
The article recommends the principle of commutative programming scan of the comparison signal. This principle allows linearization of transient characteristics «regulating pilot — output voltage» of pulse-width convertors. In the article obtained the expressions for determining the sequence of discrete samples, forming a functional scan reference signal. The functional scan is necessary for the linearization...
Variation of wind power affects the stability of a multi-terminal HVDC (MT-HVDC) system installed in the purpose of integrating offshore wind farms and supplying an offshore constant power load in oil and gas plat form. This paper investigates the stability of such MT-HVDC system. In order to determine the stability, an impedance-based stability method is adopted. The stability is determined by checking...
In the context of microgrids, most of the research has concentrated on developing new control strategies for integration of DG sources into the power grid and seamless transition techniques between grid-connected and islanded modes. However, a few research work has focused on the power control at the point of common coupling (PCC) between utility grid and microgrid. This paper presents alternative...
This paper presents a Finite State Machine (FSM) model of a photovoltaic (PV) power plant consisting of a PV array, a DC boost converter with maximum power point tracking and a grid-tie voltage source converter with a phase-locked loop controller. The FSM approach is used to represent different states of the PV power plant. Such an arrangement enables a simulation time to be reduced, while at the...
Smart grid is a developing field for energy researchers. It offers technological improvements to have more controllable, reliable and sustainable power grids. Especially, the decreasing trend of fuels has pressurized to pay researchers’ attention to renewable energy sources such as solar systems and wind turbines. The renewable energy sources generate electric power in different characteristics. Therefore,...
This paper presents a digital Active Gate Drive (AGD) methodology for power semiconductor devices. The inherent latency limitation of digital signal processing systems is addressed by a sequential optimization procedure that uses voltage and current signals recorded at the previous switching edge to develop an optimized gate drive waveform for the next switching edge. Experimental results using a...
HVDC transmission technology is an efficient alternative for bulk power transmission over long distances and is used for subsea electrical transmission and interconnection of asynchronous ac grids. Converters play an important role in HVDC transmission systems. Here a Bidirectional Buck Boost Inverter based HVDC (BBI-HVDC) transmission system is presented. The output voltage and current of the new...
Power Electronics is essential in almost most of the modern renewable energy generation in order to enhance the efficiency of the generation. Converters are used as an interface between load and PV panels particularly for Maximum Power Point Tracking (MPPT). This paper introduces the reliability model of solar PV generation system not only on the physical characteristics but on the simulated operating...
The topology of modular multilevel converters (MMC) is investigated in this paper. First, single phase half bridge inverter with split wound coupled inductors was studied, it was found that more voltage levels can be generated by using split wound coupled inductors. Therefore, new MMC topology was proposed by the analysis result, therein, two more diodes were used for each arm, and split wound coupled...
As the number of DC loads are growing in our daily uses, the low voltage DC (LVDC) distribution system is becoming important. Power supplied through the low voltage AC (LVAC) distribution system needs both the AC/DC rectifier and the DC/DC converter to supply the DC loads. In comparison, LVDC system would only need the DC/DC converter to supply the DC loads. Integration of renewable energy sources...
The reliability of the convertor in double-fed wind power generator set is relatively poor. Once the switch of the convertor fails, the entire wind turbine set may be severely damaged or shut down. As to the issues, an open-circuited fault detection method is proposed on the basis of parameter estimation for the switch of rotor side convertor in double-fed wind power generator set. A whole model is...
Today, there is a long-term trend towards bi-directional and flexible charger functions for not only drawing current from the grid but also feeding excess energy back into it. The Configurable Modular Multilevel Converter (CMMC) offers a large flexibility in order to handle the different voltage levels and current intensities in electric vehicle's battery charging and discharging. Therefore, this...
This paper reports on the work of the CIGRÉ C6.22 Working Group, Microgrid Evolution Roadmap, which has recently finalized its first Technical Brochure. The Working Group was asked to identify the main elements required to justify, develop, and implement viable microgrids, which the Group defined as follows: Microgrids are electricity distribution systems containing loads and distributed energy resources,...
This paper provides recommendations for volt-VAr and voltage ride-through needs from distributed energy resources (DERs) to contain fault induced delayed voltage recoveries (FIDVRs) events and help stabilize the grid. FIDVR events can potentially cause chain reactions and destabilize the grid. Additionally, it will provide typical residential air conditioner (RAC) unit performance during voltage transients...
This paper proposes a novel integrated plug and play (PnP) DC/DC parallel PV architecture for powering residential buildings. The scheme is based on low cost PV converters (first stage) integrated into one mechanical enclosure along with a second stage grid tied centralized inverter or converter in the case of DC powered applications. The technique limits the requirements of the first stage converters...
Demand for renewable energy has grown to achieve sustainable, and clean energy not associated with a carbon footprint. Photovoltaic energy (PVE) is a significant renewable resource, and this paper presents an overview of current research on PVE systems and technology. Various topologies for PV power converter/inverter technologies are reviewed, and discussed with respect to their advantages and drawbacks.
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