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With the increasing penetration of wind power into electric power grids, energy storage devices will be required to dynamically match the intermittency of wind energy. This paper proposes a novel two-layer constant power control scheme for a wind farm equipped with doubly fed induction generator (DFIG) wind turbines. Each DFIG wind turbine is equipped with a supercapacitor energy storage system (ESS)...
In this paper a so-called sliding mode control (SMC) technique is applied for variable speed wind energy conversion system (WECS) control with doubly-fed induction generator (DFIG). The paper also points out interesting performances of the double-fed induction machine (DFIM) used as flywheel energy storage system (FESS). In fact, adjusting the rotor speed can allow the induction machine to release...
This paper proposes a combined protection and control strategy to enhance the low voltage ride-through (LVRT) capability of a wind turbine driven doubly fed induction generator (DFIG). Since the conventional crowbar is activated to protect the rotor side converter during the fault interval, the DFIG will operate in the fix speed mode and absorb large amount of reactive power from the grid. This problem...
This paper proposes a ride-through technique of doubly-fed induction generator (DFIG) wind turbine systems. The control technique uses energy storage devices (ESD) which are controlled with current and power control loops. During grid faults, the generator output power can be reduced by increasing the generator speed, resulting in increased inertial energy of the rotational body. Also, the output...
The paper presents an emerging technology of electricity generation based on decoupled theory. The decoupled generation system operates in wide speed range and control strategy is oriented to select regions of high efficiency of the driving engine. This system is used to operate in parallel with renewable energy source RES, which is unstable and not reliable. In case of high power available from the...
Wind energy is gaining the most interest among a variety of renewable energy resources, but the disadvantage is that wind power generation is intermittent, depending on weather conditions. Energy storage is necessary to get a smooth output from a wind turbine. This paper presents a new integrated power generation and energy storage system for doubly-fed induction generator based wind turbine systems...
The output power of wind turbines fluctuates due to wind speed variations. These power fluctuations make the wind power undispatchable, causing frequency deviations and power outage when wind power penetration is significant. Energy storage devices such as batteries, ultracapacitors, super inductors and flywheels can be utilized in a hybrid system to solve this problem. Although these methods are...
This paper presents an experimental characterization of a flywheel energy storage system. The device is based on steel seamless tube mounted as a vertical axis flywheel storing kinetic energy. The motor/generator is a permanent magnet synchronous machine controlled by an AC-AC matrix converter. The matrix control method uses a discrete-time model of the converter system to predict the future values...
Depending on wind speed, a doubly fed induction generator (DFIG) based variable speed wind turbine is capable of operating in sub- or super-synchronous mode of operation using a back to back PWM converter. A smooth transition between these two modes of operation is necessary for reliable operations of the wind turbine under fluctuating wind. This paper presents the analysis and modeling of DFIG based...
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