scholarly journals Reliability of Variable Speed Pumped-Storage Plant

Electronics ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 265 ◽  
Author(s):  
Anto Joseph ◽  
Thanga Chelliah ◽  
Sze Lee ◽  
Kyo-Beum Lee
Keyword(s):  
Markov Model ◽  
Power Plants ◽  
Reactive Power ◽  
Induction Machine ◽  
Voltage Source ◽  
Variable Speed ◽  
Doubly Fed Induction Machine ◽  
Optimal Efficiency ◽  
Doubly Fed ◽  
Pumped Storage

The multi-channel (MC) back-to-back voltage source inverter (VSI)-fed doubly fed induction machine (DFIM) is emerging as a highly interesting topic in large-rated variable speed pumped-storage power plants (PSPP) in view of cost, optimal efficiency, and space requirements. Although the VSI is the fundamental part of the drive controlling the active/reactive power of the plant, redundancy is presently not adopted in practice causing the unit as a whole to shut down upon a failure in the converter and control circuit. This paper evaluates a large-rated (250 MW) DFIM-fed variable-speed unit of a PSPP in terms of its reliability and availability. A Markov model is developed to assess the reliability of the drive based on a number of factors including survivability and annual failure rate (FIT). Further, the Markov model is applied to different PSPPs for comparison of reliability among them.

scholarly journals Variable speed synchronous condenser using doubly-fed induction machine

2004 ◽  
Vol 15 (2) ◽  
pp. 172-180
Author(s):  
Antonio Carlos Ferreira ◽  
Luciano Moraes de Souza ◽  
Edson H. Watanabe
Keyword(s):  
Reactive Power ◽  
Storage System ◽  
Induction Machine ◽  
Energy Storage System ◽  
Power Converter ◽  
Total Power ◽  
Variable Speed ◽  
Doubly Fed Induction Machine ◽  
Doubly Fed ◽  
High Level

The wound rotor induction machine (WRIM) presents characteristics that make it attractive as an energy storage system where the energy is stored as kinetic energy in the rotor moving parts. When operating in the doubly fed mode (DFIM), with the rotor fed by a variable frequency power converter, the WRIM behaves as a synchronous machine, differing from the latter in the variable speed operation and larger dumping effect when subjected to disturbances. As the converter only needs to be designed to handle a fraction of the total power, the system can be used at a high level of power. This paper presents the analysis of a Doubly Fed Induction Machine (DFIM) used as a controlled active and reactive power compensator. The simulation and experimental results obtained show that this system can be used for voltage control in a power system as well as load-leveling device.

scholarly journals Grid Forming Stator Flux Control of Doubly-Fed Induction Generator

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6766
Author(s):  
Norbert Klaes ◽  
Florian Pöschke ◽  
Horst Schulte
Keyword(s):  
Reactive Power ◽  
Induction Machine ◽  
Induction Generator ◽  
System Response ◽  
Doubly Fed Induction Generator ◽  
Generator System ◽  
Flux Control ◽  
Doubly Fed Induction Machine ◽  
Stator Flux ◽  
Doubly Fed

The doubly fed induction generator is widely used in wind power applications. For stand-alone operation of this machine, the control of the stator flux with fixed voltage and frequency has been proposed. This paper extends the stator flux control of the doubly fed induction machine by droop mechanisms, which vary the setpoint of flux magnitude and frequency depending on active and reactive power. This gives the doubly fed induction generator system unknown grid supporting and grid forming performance. The validation of the proposed control scheme has been conducted on a 10kVA testbed system. The closed-loop behavior of the system has been proven to enable grid-tied and islanded operation with the same control structure. The system response to load changes and islanding events show no disruptive transients in both conditions.

Francis Turbine Modeling for Hydrounit on the Bases of the Doubly Fed Induction Machine

2015 ◽  
Vol 792 ◽  
pp. 203-208
Author(s):  
Rustam Kh. Diyorov ◽  
M.V. Glazyrin
Keyword(s):  
Mathematical Model ◽  
Numerical Modeling ◽  
Induction Machine ◽  
Hydraulic Turbine ◽  
Francis Turbine ◽  
Variable Speed ◽  
Physical Representation ◽  
Doubly Fed Induction Machine ◽  
Doubly Fed ◽  
The Mathematical Model

The mathematical model of Francis turbine, operating at variable speed hydrounit, has created. The results of numerical modeling are fully consistent with the physical representation of the behavior of the hydraulic turbine in dynamic modes.

scholarly journals An adaptive input-output feedback linearization controller for doubly-fed induction machine drives

2008 ◽  
Vol 5 (1) ◽  
pp. 139-154 ◽  
Author(s):  
Farrokh Payam
Keyword(s):  
Output Feedback ◽  
Feedback Linearization ◽  
Reference Frames ◽  
Induction Machine ◽  
Control Technique ◽  
Voltage Source ◽  
Input Output ◽  
Nonlinear Controller ◽  
Doubly Fed Induction Machine ◽  
Doubly Fed

In this paper a nonlinear controller is presented for Doubly-Fed Induction Machine (DFIM) drives. The nonlinear controller is designed based on the adaptive input-output feedback linearization control technique, using the fifth order model of induction machine in fixed stator d, q axis reference frames with stator currents and rotor flux components as state variables. The nonlinear controller can perfectly track the torque and flux reference signals in spite of stator and rotor resistance variations. Two level SVM-PWM back-to-back voltage source inverters are employed in the rotor circuit, in order to make the drive system capable of operating in the motoring and generating modes below and above the synchronous speed. Computer simulation results obtained, confirm the effectiveness and validity of the proposed control approach.

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