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Stabilization of multi‐machine power systems by coordinated excitation control of multiple adjustable‐speed generator/motors
Author(s) -
Tatematsu Masamoto,
Yokoyama Akihiko
Publication year - 1997
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/(sici)1520-6416(199703)118:4<10::aid-eej2>3.0.co;2-q
Subject(s) - transient (computer programming) , control theory (sociology) , rotor (electric) , excitation , power (physics) , voltage , power control , generator (circuit theory) , ac power , electric power system , controller (irrigation) , electronic speed control , engineering , synchronous motor , computer science , electrical engineering , control (management) , physics , quantum mechanics , artificial intelligence , agronomy , biology , operating system
Since an adjustable‐speed generator/motor (ASGM) is excited by ac voltage fed by a quick‐response cyclo‐converter, rotating speed of the rotor can be constantly changed. The ASGMs installed at some pumped‐storage power stations achieve automatic frequency control during nightly demand troughs by changing the pumping power to accord with the rotating speed. It is expected, on the other hand, that under peak generation during the day, the ASGM will be used for enhancement of transient stability because it can generate or absorb active and reactive power independently via the ac excitation voltage control. This paper proposes a novel control method for the excitations systems of ASGM that will improve the transient stability of multi‐machine power systems like multiple ASGMs. The controller, which is designed for an energy function, works well for stability enhancement. To gauge it against conventional excitation control of synchronous generators and against constant output power control of ASGMs, the effectiveness of the proposed method is simulated in digital trials. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 118 (4): 10–19, 1997