Dynamic characteristic of frequency control by rotary frequency converter to link wind farm and power system

G. Fujita*, K. Ezaki, T. Nakano, R. Yokoyama, K. Koyanagi, T. Funabashi

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    9 Citations (Scopus)


    This paper proposes an application of rotary frequency converter for a wind farm system. Wind power is getting attention for prospective renewal energy sources, and introduction of wind farm generation will solve environmental matters and energy exhaust problem. However, the quality of power system frequency will be degraded as the capacity of wind power generator increases. Attenuation of mismatch between the served power and load demand is most important problem in order to increase number of wind generators. Here, a large rotary frequency converter is proposed as a buffer to connect the wind farm and the power system. This provides energy storage function of the output power associated with irregular wind power. The converter has a synchronous generator and a doubly-fed machine. The synchronous motor is connected to the wind farm to supply AC voltage for induction generators of wind power generation units. The shaft of the doubly-fed machine is mechanically jointed to the synchronous motor, and rotates together. Tuning the current of the secondary winding supplied by cycloconverter or self-commutated inverter controls the output power. At present, doubly-fed machine is commonly used in pumped storage hydraulic power plants recently constructed. The proposed scheme is an expansion from the present application. For the evaluation of the proposed scheme, two simulation tests are carried out. One is load reference setting test for discussion of the power exchange response to a power grid. Other is load frequency control test in order to discuss required capacity for the rotary frequency converter to improve the frequency quality.

    Original languageEnglish
    Title of host publication2003 IEEE Bologna PowerTech - Conference Proceedings
    Number of pages7
    Publication statusPublished - 2003
    Event2003 IEEE Bologna PowerTech Conference - Bologna
    Duration: 2003 Jun 232003 Jun 26


    Other2003 IEEE Bologna PowerTech Conference


    • Frequency control
    • Power generation
    • Wind power generation

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology
    • Fuel Technology


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