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This paper proposes a new control scheme for a permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS). In this scheme, the generator and grid currents are controlled using a hysteresis current controller (HCC). The control system of the back-to-back converter based on the HCC is described. Modeling and simulation of the system are developed using Matlab/Simulink to...
The integration of renewable energy sources, especially wind energy, has been on the rise throughout the power system worldwide. Due to this relatively new introduction, the integration of wind energy is often not optimized. Moreover, owing to the technical constraints and transmission congestion of the power network, much wind energy that could have reached load centers has to be curtailed. Due to...
This paper presents a medium voltage power conversion architecture for grid integration of multi-MW permanent magnet synchronous generator (PMSG) based wind energyc-conversion system (WECS). Converting the low voltage power output of the generator to medium voltage, can reduce the diameter of the power cable significantly. As a result, power loss and the overall cost of the system can be minimized...
With the depletion of fossil fuels and skyrocketing levels of CO2 in the atmosphere, renewable energy sources continue to gain popularity as a long-term sustainable energy source. However, two major limitations exist that prevent widespread adoption: variability of electricity generated and cost of the equipment needed. A grid-tied photovoltaic (PV) / wind hybrid system with battery back-up can help...
This paper presents the implementation of a sensorless vector control scheme for a surface mounted Permanent Magnet Synchronous Generator (PMSG)-based Wind Energy Conversion System (WECS). This sensorless strategy is based on a sliding mode observer and a minimum order observer, which are used for estimating the position and the speed of the PMSG, respectively. The proposed sensorless scheme does...
The increased integration of wind generation via high power converters imposses numerous gauntlet to the management and control of modern power systems. One of them is caused by the decoupling effect between the power sources from the AC grid. It negatively impacts the system frequency response of modern power systems. This paper proposes a controller to enable the primary frequency regulation on...
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.
Extremum seeking control (ESC) can be utilized as a maximum power point tracking (MPPT) method that optimizes the operating point of a wind energy system by adjusting the wind turbine's rotor speed according to the change in the wind speed. Although ESC has a tracking ability and quick response capability that is better than those of the conventional MPPT methods, it increases the mechanical vibration...
Renewable energy is the future of energy generation. As wind turbine is big part of this energy revolution, research of its impact to current electrical power grid is of paramount importance. Wind speed varies periodically and geographically. This variability of wind power generation needs to be compensated by the conventional generators. In doing so, the temperature of the generators increased in...
Many islands in China are far from the mainland and electricity is difficult to cover or the cost is high, due to this issue, the wind energy, wave energy and solar energy can be used to meet the demand of island power supply. However, the energy density of these renewable energy sources is low and the stability is poor, which may cause power supply instability. To deal with this issue, a multi-energy...
A Linear Rotary Permanent Magnet Generator(LRPMG) is proposed for wind-wave combined power generation system(WWCPGS). The rotary unit and linear unit of the LRPMG can be used to generate electricity by wind energy and wave energy, respectively. Compared with rotary generator by single wind power and linear generator by single wave power, the LRPMG can improve the utilization rate of the material and...
This paper proposes the use of an active yaw system to protect small and medium wind turbines in the high wind zone from overloading. The active yaw system turns the rotor partially out of the wind to decrease the turbine power. The dependency of the power on the yaw angle is modeled by the third power of the cosine of the yaw angle. A proper controller is configured based on on-off control of the...
The goal of this paper is to design a wind turbine generator operated under variable speed with intelligent pitch angle control capability under variable wind conditions. The control scheme for the variable speed wind turbines has been discussed and analysed using wind turbines driven by the permanent magnet generators connected to the grid. Main strategies of conventional control and intelligent...
More accurate dynamic models of wind turbines are of great importance in validating simulation results of their interaction with the network (micro-grid), and thus the reliability of the network (micro-grid) is improved. The first of this paper is an overview of wind power and wind energy conversion system structures. In addition, network requirements in the presence of wind energy conversion systems...
The use of renewable energy has increased significantly in recent years. In some cases, the use of renewable energy sources is a matter of vital importance due to the lack of other environmentally friendly and economical energy source. We have analyzed possible scenarios with different types of power generation (diesel, solar, wind) for an isolated system at the Fernando de Noronha archipelago, located...
In this paper, simulation and experimental results of a fault tolerant of a squirrel cage six-phase induction generator (SC6PIG) are presented. The proposed generator, suitable for grid connected multiphase wind energy generating system, is composed of a 24kW SC6PIG prototype connected to a full scale back-to-back converter structure. The aim of this paper is to validate experimentally the model of...
The Series Dynamic Braking Resistor (SDBR) helps in the post fault recovery of the wind generator. This paper investigates the best location of the SDBR in the Doubly Fed Induction Generator (DFIG) architecture, considering the best switching signal of the SDBR. The SDBR was connected at the stator, rotor and grid side converter of the DFIG wind generator. The DC-link voltage, rotor current and grid...
A robust control approach depending on delay is designed for the pitch-controlled variable-speed wind energy conversion system (WECS) above the rated wind speed range under the impact of time-delays. H∞ performance index is adopted to test the effect of the disturbance on the controlled output. A state feedback controller with time delay is designed such that the wind output power can be maintained...
This paper is focused on challenges related to an increased quantity of distribution energy resources connected to the distribution network within the context of newly defined requirements ENTSO-E, follow-up European standards TS 50549 and codes of distribution system operators on regulation of voltage through control of the reactive power in terms of P-Q diagram. A high number of connected and operated...
In this paper, a new analytical method and a corresponding two-step procedure are proposed for a wind power generation system design. This comprehensive new method can achieve the wind energy potential evaluation, reliability and costs assessment. In Step 1, the wind energy potential is investigated through the Weibull two-parameter model using the hourly wind speed data of a site. The graphic method...
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