Conference Paper

Robust control design for frequency regulation in power systems with high wind penetration

Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA
DOI: 10.1109/ACC.2010.5530838 Conference: American Control Conference (ACC), 2010
Source: IEEE Xplore


This paper concerns frequency regulation performance in power systems with a high level of wind generation penetration. As wind generation becomes a significant portion of total energy production, wind power variability will cause system frequency to deviate from nominal value. Short-term wind power fluctuations are characterized by frequency spectra. This information is used together with robust control, specifically the H method, to synthesize new governors for conventional plants in order to better attenuate frequency deviation caused by wind power fluctuations. A reduced-order controller is obtained based on Hankel singular values. Simulation results show the effectiveness of the H controller. This work suggests several directions for further research.

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    • "However, due to the disadvantages of standard H ∞ methods, it produces a high-order dynamic controller which is generally undesirable in practice. Therefore, the approach in [10] is only applicable to small-scale power systems. For large-scale power systems, reduced-order model are often used. "
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    ABSTRACT: As wind generation becomes a significant portion of total energy production, wind power variability will introduce more variability in system frequency. This paper presents a method to improve primary control for frequency regulation in large-scale power systems with high wind power penetration. To assure system stability, a passivity-based framework is developed for power systems by introducing a storage function derived from the entropy of individual generators. Tellegen's theorem is invoked to derive the storage function for the entire power network. Given the network parameters and the point of interconnection of the wind farm, a single generator is selected to balance wind power fluctuations. A passive H<sub>∞</sub> controller is synthesized for the selected generator by using a passive reduced-order model of the large-scale power system. Simulation results of a 9-bus test system show the effectiveness of the passive H<sub>∞</sub> controller. This work also suggests several directions for further research.
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