Control of active power in a doubly-fed induction generator taking into account the rotor side apparent power

Park, J.W.; Lee, K.W.; Lee, H.J.

doi:10.1109/pesc.2004.1355435

Cited by 13 publications

(8 citation statements)

References 5 publications

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“…Power quality issues have been a top concern for modern power generation and distribution systems. Seasonal loads and electrical distortions make the power system unstable and generate the power quality problems: the instantaneous interruption, voltage sag, flickers, short-term power-off [7], lack of reactive power or active power [8], and etc. In order to solve these problems, variety of energy storage systems are applied with different terminologies.…”

Section: Requirement Of Fess In Power Systemsmentioning

confidence: 99%

“…This is accomplished by locking the phase of the reference system such that the rotor flux is entirely in the d-axis (flux axis), resulting in the mathematical constraint qr 0 . [25] Therefore, (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) The torque equation shows a proportional relation between the desired torque and the torque-producing current component qs i . Therefore, a linear torque control is achieved and only proportional to torque-producing current qs i when rotor flux is fixed.…”

Section: Decoupling Control Technique Of Focmentioning

confidence: 99%

“…to eliminate dr i yields the equation relating ds i and The relation between the flux-producing current ds i and the rotor flux dr  , is a first-order linear transfer function with a time constant r  , where r r r L / R  From the derivations above, Eqn. (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) shows that the electrical torque is only proportional to i qs * when rotor flux is fixed without an interaction with i ds *. Eqn.…”

Section: Decoupling Control Technique Of Focmentioning

confidence: 99%

“…In order to overcome the sudden change of the applied flux excitation current, the excitation current is applied with a ramp control (Fig. [3][4][5][6][7][8][9][10][11]. The relationship between the setting times vs. ramp rate is investigated in Fig.…”

Section: Investigation On Settling Time Vs Ramp Rate Controlmentioning

confidence: 99%

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Sensorless speed estimation for long term flywheel energy storage system in standby mode.

Liu¹

2021

Preprint

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A novel technique for sensorless speed estimation is presented in this thesis for squirrel cage induction machine (SCIM) drived long-term flywheel energy storage system (FESS) in standby mode. The SCIM model for long-term large-capacity FESS is presented. Based on dynamic model , a hybrid rotor flux observer and speed observer are derived. The hybrid rotor flux observer takes advantages of both the current model and voltage model flux observers by seamlessly incorporating these two models together for a better flux estimation performance even at low speed range. The fundamental speed observer is derived from the dynamic model for speed estimation with a fast response time for a tradeoff of the adaptive capabilities. In order to observe the speed in standby mode, a modified field-oriented control (FOC) scheme is presented. The hybrid flux observer and speed observer are tested in association with the modified FOC. The proposed control technique adopts approaches in an effort to minimize the impact generated by the excitation and speed estimation process to the FESS. Simulation and experiments are conducted to verify the feasibility of the proposed speed estimation at the standby mode. It is also observed that a step change of excitation current has a significant impact to the existing FESS. A ramp control for excitation current is added to avoid the possible oscillation of the estimated speed and the disturbance to the FESS. The speed estimation settling time is optimized based on the experiment and simulation.

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Section: Requirement Of Fess In Power Systemsmentioning

confidence: 99%

Section: Decoupling Control Technique Of Focmentioning

confidence: 99%

Section: Decoupling Control Technique Of Focmentioning

confidence: 99%

Section: Investigation On Settling Time Vs Ramp Rate Controlmentioning

confidence: 99%

See 2 more Smart Citations

Sensorless speed estimation for long term flywheel energy storage system in standby mode.

Liu¹

2021

Preprint

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“…Since the reactive power demand of the DFIG and also the rating of power converters increase proportionately with slip, it is a common practice to restrict the maximum slip to about 30%. To facilitate larger slip operation with the same 30% rated converters, a technique involving slackening of the zero reactive power constraint on stator side was proposed [26]. However the issue of decaying generator efficiency at low speeds was not looked into.…”

Section: Introductionmentioning

confidence: 99%

A stator voltage switching strategy for efficient low speed operation of DFIG using fractional rated converters

2015

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a b s t r a c tThis paper presents a scheme for extending low speed operation of a wind driven Doubly Fed Induction Generator (DFIG) with limited rating converters (30%). In this scheme, a low voltage is applied to the stator at rotor speeds below the normal range (0.7 p.u.) while the nominal voltage is applied when the rotor speed is above this range. The switch-over to a lower stator voltage below a threshold speed facilitates to maintain the operational efficiency with the same fractional rated converters. Simulations results of a typical 250 kW DFIG in Matlab/Simulink environment reveal that, a lower stator voltage increases the generator efficiency at lower speeds without exceeding (limited) rating of the rotor side power converter. Typically the speed range is extended by 20% when reduction in voltage is 42%. With a 250 kW generator the energy harvested over one year is increased by 61.1 MWh with the proposed scheme. The scheme is simple, economical and can be implemented through speed sensor and contactors. Experiments on a laboratory test set up demonstrate the efficacy of the proposition.

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Positive and Negative Sequence based Sensorless Control for Stand-Alone Slip-Ring Generator

Iwański

Koczara

2006

2006 12th International Power Electronics and Motion Control Conference

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Control of active power in a doubly-fed induction generator taking into account the rotor side apparent power

Cited by 13 publications

References 5 publications

Sensorless speed estimation for long term flywheel energy storage system in standby mode.

Sensorless speed estimation for long term flywheel energy storage system in standby mode.

A stator voltage switching strategy for efficient low speed operation of DFIG using fractional rated converters

Positive and Negative Sequence based Sensorless Control for Stand-Alone Slip-Ring Generator

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