Variable-speed generation with the series-resonant converter

Journal Article · Thu Dec 01 04:00:00 EST 1988 · IEEE Trans. Power Electronics; (United States)

DOI:https://doi.org/10.1109/60.9349· OSTI ID:6495766

Lauw, H K ^[1]; Klaassens, J B ^[2]; Butler, N G ^[3]; Seely, D B ^[3]

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1. Oregon State Univ., OR (US)
2. Delft Univ. of Technology (NL)
3. Bonneville Power Administration (US)

This paper presents results of study and measurements of a variable-speed generation (VSG) system which uses a series-resonant converter to excite the rotor windings of a doubly-fed generator. Despite the perceived merits, serious concerns exist about VSG systems pertaining to excessive harmonic distortion which the required power electronic converter could cause. Moreover, the use of inadequate converters may prevent the VSG system from becoming a viable economic alternative to fixed-speed generation systems, as well as prevent the exploitation of powerful features of the doubly-fed generator. Adequacy of the series-resonant converter to address these aspects has been demonstrated with a laboratory-scale (15 kW) VSG system. The capabilities of this system includes maximum-efficiency operation and limited converter rating for a speed-range from zero RPM up to well beyond synchronous speed, as well as flexibility for line voltage control, reactive power generation and synchronization at zero RPM. Results of accurate measurements on the harmonic distortion are provided which show the superiority of the use of the series-resonant converter when compared with a VSG system using a conventional cycloconverter or a DC-link converter. A convenient tool for analyzing the operating modes of the VSG system is presented, which can be developed into efficient supervisory control logic to assure proper operation under varying resource conditions.

• OSTI ID: 6495766
• Journal Information: IEEE Trans. Power Electronics; (United States), Journal Name: IEEE Trans. Power Electronics; (United States) Vol. 3:4; ISSN ITCNE
• Country of Publication: United States
• Language: English

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