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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...
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...
For the purpose of solving the problem that rotor side power and DC bus voltage frequently changes, present paper describes an experimental platform constructed by an 11kW doubly-fed induction generator (DFIG) wind power generation, which uses a back-to-back PWM converter as the excitation power supply for the DFIG wind power generation system of variable speed constant frequency (VSCF). The converter...
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...
Wind turbine WT occupies gradually a large part in world energy market, Doubly fed induction generator DFIG is mostly used in WT, it allow highly flexible active and reactive power generation control. These machines are driven by power collaborating converters: voltage source converter VSC and rotor-side converter RSC protected using crowbar protection against transient over current. This paper develops...
Different electric wind power conversion systems structures can be used based on the structures of converters used. The main objective in all topologies is always the same: the wind energy at varying wind velocities has to be converted to electric power with the highest performances [6,7,8,9,10]. In this paper a wind energy conversion schemes is presented based on the Indirect Field Oriented Control...
A novel scheme for enhancing the fault ride-through (FRT) capability of Doubly Fed Induction Generator (DFIG) is proposed in this paper. In addition, a coordinated reactive power control strategy for grid side and rotor side converters of DFIG is also proposed. This coordinated control aids rapid recovery of terminal voltage at the clearance of severe grid fault. Extensive simulation study is carried...
With increasing penetration of wind power, there is rising need to manage its intermittency. This paper explores the control and operational aspects of integrating a short and long-term storage mix, consisting of a fuel-cell, an elcetrolyzer and an ultracapacitor, into the double-fed induction generator based wind-power system, making it dispatchable. The fuel-cell/electrolyzer is employed to provide...
For wind farms in near sea, in which doubly-fed induction generator (DFIG) runs, located at different site respectively, multi-terminal VSC-HVDC (Voltage Source Converter based HVDC) helps to resolve connection for each other and transmitting electrical power into main grid. The paper models wind farms, VSC-HVDC, designs control system and specially takes their control together into account in order...
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