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This paper investigates the effect of wind speed variations on the small-signal stability of doubly-fed induction generator-based wind turbines equipped with modified virtual inertial controllers (MVIC). MVIC is a control scheme that prudentially emulates the inertial response of the conventional synchronous generators for wind turbines in order to improve their frequency control performance. It also...
This paper proposes a new method to control the frequency fluctuations of the power system with large scale wind farm (WF) installed by using High Voltage Direct Current (HVDC) interconnection and battery systems. The proposed system is designed to decrease the frequency fluctuations. Simulation analysis is performed on a multi-machine power system model composed of synchronous generators (SGs), squirrel...
We present experimental results for blade pitch control in a scale model of a floating wind turbine. The blade pitch controller was designed using an H∞ loop-shaping design procedure and its performance was evaluated by using an actual scale model. The experimental results show that the controller has good performance in regulating rotor speed and reducing the platform's pitching motion.
In recent years, environmental problems are being serious and renewable energy has attracted attention as their solutions. However, the electricity generation using the renewable energy has a demerit that the output becomes unstable because of intermittent characteristics such as variations of wind speed or solar radiation intensity. Therefore, it can cause frequency fluctuations or voltage fluctuations...
This paper presents a novel approach of coordinating the droop controls between grid-connected variable speed wind turbine (VSWT) and associated energy storage system (ESS) for supporting the primary frequency control in power systems. Available power reserve from the deloaded VSWT, which is a function of average wind speed and turbine rotational speed, is estimated in an efficient manner. Based on...
Wind energy have for many years been a growing alternative to fossil energy. The sizes of turbines are increasing to megawatt level. Wind turbines operate in a wide range of wind speeds but are shot down for high wind speeds. Traditional concepts are relatively stiff and have a cause stress on the gearbox. The turbine described in this paper overcomes some of these challenges by having flexibly and...
This paper presents a control scheme for a standalone microgrid having a variable-speed wind-generator (W G) and a diesel-generator (DSG) both directly interfaced at a point of common coupling (PCC), and a battery energy storage (BES) interfaced at the PCC via a bidirectional DC-AC converter. The BES not only regulates the PCC voltage and frequency during wind and/or load power variations, but also...
An increased share of variable speed wind turbines reduces the inertia of the power system due to the decoupling of mechanical rotor frequency and grid frequency. In the recent years, a lot of research has been done about exploitation of the rotating mass of a wind turbine for participation in the primary frequency regulation of the power system. This paper proposes a linearized general variable speed...
Rapid growth of wind power penetration brings difficulties in maintaining the power system frequency stability after a large active power disturbance. It is specified in some countries that wind farms must provide frequency support functions. To properly exploit the kinetic energy stored in the doubly fed induction generator (DFIG) to support the frequency regulation, especially considering the realistic...
This paper presents an analysis of the main maximum power point tracking (MPPT) methods used for small wind turbines, from the perspective of providing dynamic frequency support in islanded microgrids (MGs). For this purpose, three MPPT algorithms are considered, which are adapted to operate in two modes, namely in normal and deloading regimes. The second mode of operation allows the wind turbine...
Increased penetration of offshore wind power plants (OWPPs) demands frequency control services from them. Overloading the wind turbine, for few seconds after the under frequency event, to utilize its kinetic energy seems promising option for fast primary frequency control. Two methods of overloading the wind turbine (WT), with and without considering the impact of WT dynamics and variation of WT output...
This paper proposes a frequency regulation strategy applied to wind turbine generators (WTGs) in an isolated grid. In order to complement active power shortage caused by sudden load or wind speed change, an improved deloading method is proposed to solve inconsistent regulation capabilities in different speed regions and provide WTGs a certain capacity of power reserves. Considering the torque compensation...
This paper presents the development and performance evaluation of a new controller for permanent magnet generator (PMG)-based wind energy conversion systems (WECSs) that are equipped with battery storage units. The proposed controller is developed to ensure the voltage and frequency stability under changes in the grid demands for active and reactive powers, and under under variations in the wind speed...
This paper presents a control strategy for small wind turbines (WTs) to enhance their dynamic support capability in microgrids (MGs). For this purpose, the paper analyses two operation cases, namely the normal mode associated with the conventional control based on maximizing the power production, and a deloading mode where the WT operates under the maximum available power. The aim is to maintain a...
This paper presents a feedback Takagi-Sugeno Fuzzy control in finite frequency for wind energy conversion systems (WECS) improved by artificial neural network. The wind energy conversion system model is represented by a Takagi-Sugeno fuzzy (TSF) model. The finite frequency approach is proposed to control the closed-loop system in an operating finite frequency domain. However, when the external perturbations...
This paper presents the modeling and simulation of isolated wind diesel hybrid system (WDHS) consisting a wind turbine generator (WTG) along with a diesel generator (DG), Ni- Cd battery base energy storage source (BESS) and a dump load (DL) provides the supply to consumer load. WTG and BESS are used in the system to minimize fuel consumption, but this makes the system more complex. The consumer load...
This paper investigates a finite frequency Takagi-Sugeno (T-S) fuzzy controller synthesis for a variable speed wind turbine. The proposed control design is based on both the T-S fuzzy modeling and the finite frequency approach. The T-S fuzzy model is proposed to deal with a nonlinear behavior of wind turbine, and the finite frequency approach allows the command in a specific domain of frequency. Using...
Power demand of isolated communities or islands primarily relies on heavy oil based diesel generator systems where these fossil fuel based power generators are not only costly but also create adverse effect on the environment. Photovoltaic generator system (PV system), wind energy conversion system (WECS) and battery energy storage system (BESS) are clean sources of alternative energy. These energy...
This paper presents control scheme for a standalone microgrid having a non-dispatchable fixed-pitch variable-speed wind turbine generator (WTG) and a battery energy storage (BES). The WTG is directly interfaced at a point of common coupling (PCC) and the BES is interfaced at the PCC via a bidirectional DC-AC converter. The unique aspect of the control strategy is that the BES not only regulates voltage...
It is now well established that renewable energy sources (RESs) and distributed generation system (DGs) are there to play major role to meet out the electrical energy needs of the world. The RESs are being utilized for electrical power generation at small levels by way of forming microgrid (MG). But because of the uncertainties involved due to unpredictable weather conditions, the power generated...
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