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The increase in penetration levels of distributed generators like PV and Wind in a distribution system makes the IEEE 519 standard to be a vital aspect towards power quality. The network resonance has been described by IEEE 519 as a major contributor towards the harmonic distortion. Non-linear loads such as transformers, machines, silicon-controlled rectifiers (SCRs), solid state devices, power transistors,...
The modeling, simulation and analysis of the energy conversion equations describing the behavior of a hybrid system PV and wind turbine, hybrid system for electrical power generation. A numerical model based on the aforementioned equations was developed, coded and results were compared to experimental data. The model is intended to be used as an optimization and design tool for such hybrid systems...
Water pumping system with wind turbine can not only effectively use wind energy, but also solve the problem of water supply and irrigation in the remote areas. In order to improve efficiency as well as reliability of wind turbine and adjust the speed of motor smoothly and quickly under the condition of wind speed changes, a variable frequency vector control method for three-phase asynchronous motor...
Electrical resonance with the grid is an increasingly common problem for wind turbines and PV inverters, especially those connected to a weak grid. Such resonance problems can usually be solved by modifying turbine or PV inverter control to reshape its output impedance. There are, however, situations where this may not be effective or not feasible at all due to e.g. limitations in turbine design or...
This paper presents a comprehensive overview of power converters and their control techniques for AC microgrids. The aim is to give an insight and direction for researchers and applications on promising topologies, control, and application within future smart grid. The paper first focuses on presenting various power converter topologies used in AC microgrids. Then, suitable control techniques for...
In order to analyze interaction between wind farm and electric power system, research transient voltage characteristics of large-scale wind farm in system fault and after fault, and realize large-scale wind farm fault ride through, it is necessary to build wind turbine modeling suitable for large electric power system simulating calculation program. Various power system simulators are used in many...
The smart city paradigm provides multiple benefits for citizens in the efficiency and environmental fields, but also represent a prerequisite for finding new, sustainable energy resources. The answer to these challenges can be the microgrid. This paper proposes a microgrid structure with a 11kW PV panel, a 500W wind turbine and one household. The generation part is modelled and validated with real...
This article presents the losses of a 5 MW wind turbine generating system comprising of a permanent magnet assisted synchronous reluctance generator (PMaSynRG) system as well as an IGBT equipped forced-commutated inverter. In this article, the focus is on the classical 2-level converter and the NPC converter. Their inverter losses using three types of modules were calculated and compared.
Characteristics of PMSGs used for current-source type wind farm composed of series-connected wind generators are studied. A series of experiments was carried out with an experimental set composed of series-connected thyristor rectifiers with PMSGs as wind turbine generators and current-source thyristor inverter. A simulation model based on trapezoidal waveforms of armature electro-motive force for...
Wind power has an important place in renewable energy systems. Therefore, it is vital to make use of wind power systems by obtaining maximum efficiency. The energy produced by the wind power systems shows variance depending on the speed and direction of wind and in some cases the wind power may not be at the expected level for the on grid micro inverter. This study aims to increase energy sustainability...
The paper presents the results of a study of an off-grid electric power system that contains typical generation and load devices. The aim of the study is to develop an algorithm for selecting the optimal parameters of adaptive control law of the energy characteristics in the off-grid power system at the connection point of a varied load. To this end a simulation experiment was carried out and its...
This paper aims at developing a Phase Locked Loop (PLL) based grid integration of wind driven three phase induction (3PIG) generator. The dynamic model of wind driven induction generator along necessary power converters is evolved in Matlab/Simulink. The system functionality is analyzed for different wind velocities. The synchronous reference frame PLL (dq/SRF PLL) synchronizes the grid and the system...
Offshore wind farms using medium voltage DC power collection promise an increase in efficiency and a reduced bill-of-material cost. One of the key components is the high power, medium voltage DC/DC converter located in the wind turbines. There are many suggested topologies in the state of the art, but they are all still at an immature technology level, as no substantial experience from full-scale...
This paper describes the implementation of a control scheme for a symmetrical cascaded multilevel converter used as a fault generator for low-voltage-ride-through (LVRT) tests of grid-connected wind energy conversion systems (WECSs). The converter is able to emulate the main faults that can happen in real power systems, with no significant impact on the grid during the LVRT tests. The proposed control...
In this paper, an enhanced control strategy of the smooth transition between the grid-tied and stand-alone operation modes of the distributed generation (DG) inverter is proposed. In the grid-connected mode, the DG inverter controls active and reactive powers flowing into the grid by regulating grid currents using typical proportional integral plus resonant (PI+R) controllers, while direct voltage...
Due to the growing penetration of wind energy into the power grid, wind power must play a more active role in grid operation and control. A decentralized wind farm power control scheme focusing on reactive power and voltage control is presented in this paper. Compared to the popular Centralized Power Control (CPC) schemes, this solution is cheaper, more reliable and needs less installation effort,...
The paper presents a microgrid structure, based on wind and photovoltaic (PV) renewable energies inputs, implemented in a dedicated configurable microgrid laboratory. The wind turbine is realized through a Hardware-in-the-Loop (HIL) emulator. PV energy can be taken from a set of panels or from a programmable DC source, which can implement the I–V characteristics of the real system. The microgrid configuration,...
In this paper, a fuzzy logic controller (FLC) is proposed for improving performance of power electronic inverter of the wind turbine with Permanent Magnet Synchronous Generator (PMSG). Membership functions of the fuzzy controller are adjusted using Cuckoo optimization algorithm (COA). Membership functions of the conventional methods are determined using trial and error method which is time consuming...
Offshore wind turbines built at a long distance from public ac-grid are connected via HVDC-transmission. Future HVDC-systems may connect offshore wind farms via uncontrolled diode rectifiers instead of VSC-HVDC converters. Due to this wind turbine inverters must own a grid forming capability. This Paper describes a fault handling strategy for offshore the wind turbines during faults in the ac-offshore...
In the multi-MW wind turbine market, the maximum power rating of a commercial wind turbine has been increased more than 5MW with a view to generate more power from Wind Power Sites [1]. The three-level neutral-point-clamped voltage-source converter has been highly applied in wind generation system. Despite the advantages, the capacitor voltage unbalancing in NPC converters has become a burning issue...
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