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Doubly fed induction generator (DFIG) based wind farm connected to series compensated networks will introduce sub-synchronous resonance (SSR). Most of the studies have ignored the effect of DFIGs at different locations. In this paper, a large-scale wind farm is divided into two sub wind farms, represented by two aggregated DFIGs at different locations. Impedance models of two sub wind farms and the...
The Static Synchronous Series Compensator (SSSC) consists two proportional integral (PI) controllers, AC voltage regulator and DC voltage regulator. The gains values of these PI controllers play an important role in performance of SSSC. The optimization technique is used to obtain the optimal values of these gains under single objectives or several objectives. Most of control problems consist of several...
This paper presents a remote renewable plant with hydro-pump station as energy storage that will also compensate main utility voltage sag. The hydro-pump station receives mechanical power from the water flow between the upper and lower reservoirs. This network-connected plant has a local 9 MW wind farm which uses doubly-fed induction generators (DFIG) as well as a critical load. The hydro pump station...
This work presents a robust model predictive control (MPC) technique for Voltage Source Converter (VSC) based High Voltage Direct Current (HVDC) converters present in a network composed of a onshore Doubly Fed Induction Generator (DFIG) based wind farm (WF) and synchronous generator(SG). The wind farm is approximated by a single DFIG system. An AC tie line assumed to be present in parallel to the...
This paper proposes a novel control method for controlling voltage source converter (VSC) based high voltage direct current (HVDC) converters present in a network consisting of a Doubly Fed induction generator (DFIG) - wind farm (WF) connected to infinite bus via an HVDC line and a parallel tie line. A new idea has been presented where inertia emulation capability of capacitors present in HVDC network...
This paper presents an innovative DFIG which has autonomous frequency control for stand-alone operation. When the wind farm is islanded, such DFIGs synchronize to form a reliable wind farm frequency source which does not collapse when member DFIGs fail. The frequency enables frequency droop control to be implemented for load sharing. The wind farm can provide fast reserve, ready to support a weakened...
This paper deals with the enhancement of the transient stability of the power system integrated with Doubly Fed Induction Generator (DFIG) based wind farms connected with Superconducting Magnetic Energy Storage (SMES) unit. The fluctuation in the wind power injection to the system due to variability in wind speed can also be reduced by the introduction of the SMES unit. The study is carried out in...
The behavior of wind farms with doubly fed induction generators (DFIGs) in fault ride through (FRT) conditions is investigated in the first part of this article. The requirements mandated by grid-codes to contribute to the voltage stability are introduced. Afterwards, the problems associated with applying the crowbar system in FRT conditions are discussed. In the next part, modeling of this problem...
When a non-bolted-three-phase-fault occurs in the outgoing transmission line from a DFIG-based wind farm with low-voltage-ride-through (LVRT) capability, the wind power side bus voltage and short-circuit current may have inconsistent main frequencies. This paper is devoted to exploring the reason theoretically. Based on the fundamental of induction generators, a simplified three-order dynamic model...
This paper deals with dynamic characteristics of the first DFIG wind farm which will be connected to the transmission power system of Republic of Macedonia. MATLAB/SIMULINK software is used to present the dynamic characteristics of the wind farm. The DFIG wind turbine and the power system are modeled with real characteristics, like in the initial project. Results from tests short circuit on 110 kV...
This paper presents adaptive internal model controller (AIMC) for a doubly fed induction generator (DFIG)-based wind farm. Rotor current controller using adaptive internal model controller is designed with Lyapunov theory to improve the voltage sag ride through. A comparative analysis is carried out with adaptive PI controller to prove the effectiveness of the AIMC for voltage sag ride through. Simulation...
With the capacities of wind generators in power system rapidly increasing, wind farms has impact on the AC grid obviously. So the problem which is to improve Low Voltage Ride Through (LVRT) capability of wind generators needs to be solved urgently. Base on the design of controllers of DFIG and controllers of VSC-HVDC system, the wind farms connected to the AC grid by two different methods of AC and...
With the rapid increase of wind farms especially large offshore wind farms, a new problem associated with the response of doubly fed induction generator to temporary overvoltage has arisen. This paper develops a theoretical analysis of the dynamic behavior during symmetrical three phase voltage swell. Overvoltage may lead to reversal of power in the line side converter. Simulation results are in good...
In this work, wind farm with VSC-HVDC connected to the grid are developed including wind side grid converter, grid side converter, DC cable and the emulated circuit control model. During fault in the AC grid DC link voltage increases rapidly and this would cause the HVDC link to trip for over voltage. To solve this problem, the location of the AC fault can be transferred to the wind farm side by reducing...
Due to growing power demand and environmental concerns, electrical power generation from renewable is receiving more attention. Wind energy generation systems are being connected in increasing numbers to power systems worldwide. DFIG has remained as promising research area for many researchers due to many reasons. This paper presents a critical survey on grid integration issues of DFIG based wind...
This paper deals with a supervisory for parallel operated Doubly Fed Induction Generators (DFIGs) based variable wind systems connected to the grid. This supervisory is designed to enhance the performance capability of this DFIG-based wind farm maximum power tracking, under different wind velocity and under small grid faults, depending on the operator power request. Detailed dynamic mathematical models...
Tins paper deals with the integration of large offshore wind farms into the power system. Some main technical issues with regard to the connection of offshore wind farms, such as the HVDC and HVAC transmission systems, the general impact of large scale wind power on the power system operation, and the grid code requirement for wind farms, are reviewed and discussed. The focus of this study is on the...
Wind farms begin to influence the power systems with the increasing amount of wind power penetration. The study of such influence justifies the need of a dynamic wind farm model comprising of a large number of generators, but detail models require high simulation computation time. An aggregation technique is required to reduce the model order while maintaining its accuracy. In this paper, a complete...
Nowadays, the power system is facing new challenges in increasing renewable energy sources' penetration. One of these problems is voltage stability in wind farms equipped with doubly fed induction generators (DFIGs) during grid faults. Flexible AC Transmission System (FACTS) devices can be used for this problem. This paper, investigates the Static Synchronous Compensator (STATCOM) application to achieve...
This paper gives a review on the power electronic applications for wind energy conversion systems. Different types of wind energy conversion system (WECS) with different generators and power electronic converters are described, and different technical features are compared. The electrical topologies of WECS with different wind turbines are summarized and the possible uses of power electronic converters...
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