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 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.

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