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This paper presents test results of the control of a pole-modulated permanent magnet synchronous generator (PM-PMSG) using a dedicated power conversion system to deliver power from an oscillating, low speed wave energy converter (WEC). Due to the low speed of the WEC, the size of the generator is increased and the machine is designed with large number of poles and concentrated winding. The electromotive...
Power quality of ac bus voltage is a key issue for microgrids. A model-predictive-control (MPC)-based distributed bus voltage compensation methods using inverter-interfaced distributed generators (DGs) connected to the concerned bus is proposed. The presented method can compensate bus voltage unbalance and harmonics and share the compensated current between inverters autonomously, with neither communication...
This paper analyzes an effect of voltage feedforward control in order to improve stability of BESS which is connected to diesel generator in stand-alone microgrid. In the stand-alone microgrid, BESS can be charged from the diesel generator when SOC of battery bank is insufficient, where BESS operates as CC-CV control. In this case, although LCL filter is designed to put a resonance point greater than...
The paper deals with a high efficiency boost rectifier for high rotational speed Gen-Set applications. It is tailored around a permanent magnet synchronous generator (PMSG) featuring an open end winding configuration. According to such a configuration the generator stator windings are connected on one side to a three level T-type unidirectional rectifier, and on the other side, to an auxiliary two-level...
With rapid increase of photovoltaic (PV) penetration in distribution system, and the fact that distributed generators may involve in voltage regulation according to IEEE standard 1547, it is necessary to check the stability of PV generator integration, especially utility PV farms. To apply generalized Nyquist Criteria (GNC) based on impedances on D-Q frame, output impedances of PV farm is derived...
Recently, DC distribution has been more and more considered in shipbuilding industry as an emerging solution due to its potential to enhance the system performance in terms of fuel economy, reliability, volume and weight. Moreover, there is a growing trend to integrate alternative power sources (APSs) and energy storage systems (ESSs) into next-generation ships, and thus reducing cost and emission...
This paper presents comparative evaluation and explores the different technologies suitable for the implementation of the Medium Voltage Direct Current (MVDC) electrical supplies for the marine on-board electrical distribution network. To realize the MVDC supply in the range from 5 kV to 25 kV, various technological choices are available during the design process and have a direct influence on the...
The more electric aircraft concept is pushing towards a DC distribution system for the on-board electrical appliances. In the scenario where multiple high-voltage and low-voltage buses are present, a power electronics converter interface is mandatory. In order to implement a resilient distribution system, the power exchange between different buses is envisaged, to ensure that a failure in a supply...
For small scale off-grid wind-solar-diesel hybrid generations with energy storage (WHGES), it is necessary to coordinate the operation of generation units and energy storage unit to maintain the voltage constant and supply the loads. This paper proposes a low cost charging scheme for off-grid WHEGES with 48V DC bus voltage. It is possible to realize the dynamic charging control of the storage unit...
In this paper, a novel current sharing control strategy, named module link, is used to realize multiple modules paralleled. To achieve this goal, there are three full-bridge phase-shift converters are used as three modules and connected in parallel to feed the load. In this study, three phase-shift control integrated circuits, named UCC28950 made by Texas Instruments Co., are used to control individual...
This paper proposes a novel distributed control scheme for DC microgrids to acquire minimum generation cost and recover the global average voltage with consideration of capacity constraints. Our main focus is on constrained problems where the power of each distributed generator (DG) is restricted to lie in the feasible region. In this paper, a global load observer (GLO) is introduced that uses neighbor's...
This paper presents a complete analysis, design and implementation of an enhanced space vector pulse width modulation (SVPWM) control for six-phase to three-phase grid connected matrix converter. The matrix converter (MC) is designed based on 18 bidirectional switches in order to interface a high performance fault tolerant multiphase permanent magnet synchronous generator (PMSG) to the main utility...
In order to meet the current requirement of low voltage apparatus protection function test, a design of three phase high current generator based on virtual instrument technology is proposed. The coarse-fine tuning voltage regulator with the compensation transformer structure is used in the main circuit of the current generator, which not only could extend the range of current regulation, improve current...
Low voltage high power wind energy conversion system (WECS) requires heavy cables and large step-up grid interfacing transformers. In recent years, power and voltage rating of offshore wind turbines have already reached 10MW and 10kV respectively, and medium voltage converters have become strongly demanded. Some scholars proposed a cascaded multilevel converter based on dual active bridge (DAB) to...
Aircraft generator is an essential part of modern aircraft electrical system. It provides electrical power for all electrical devices to complete flight missions. Building non-real-time simulation generator model for system-level aircraft electrical system can verify designing scheme and help designers detect shortages early to improve the design. The simulation platform already exist cannot afford...
This work proposes a Fast Response One Cycle Control (OCC) strategy for Active Power Filters (FOCC-APF). Moreover, a comprehensive study of the OCC technique, exploiting their features and inherent drawbacks to provide a better understanding of this technique is presented. Finally, simulation results of the active power filter with the conventional and proposed strategies are shown to evaluate APF...
In this paper, the excitation control with rotary exciter of generator A2 in Thermal Power Plant “Kostolac A” is presented. Excitation system under consideration consists of a main exciter, an auxiliary exciter and power semiconductor rectifiers. The main exciter is a synchronous-reluctance generator with windingless toothed rotor. That excitation system is specific due to the fact that the main exciter...
This paper presents a practical way of identifying the defective diodes of an alternator. For this purpose are presented a series of experimental tests of some car alternators. There are detailed the automatic voltage control by modifying the excitation current of the generator and different waveforms of the voltage obtained when one or more rectifier diodes are damaged. The paper ends with conclusions...
Consensus based distributed robust adaptive finite-time secondary voltage control is designed for inverter-based islanded AC microgrids. The design combines decentralized local states information with the states of the neighboring distributed generators with directed communication topology. Robust control algorithms are used locally for each distributed generator to deal with uncertainty. Lyapunov...
In this paper a flux weakening method for a wind power permanent magnet generator is proposed. In a wind energy conversion system, the rotor speed increases with the wind speed, hence a flux weakening (FW) algorithm should be implemented as a part of the control structure in order to prevent generator voltage from exceeding the maximum permissive value. On the other hand, it is essential to provide...
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