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Tertiary Regulation of Cascaded Run-of-the-River Hydropower in the Islanded Renewable Power System Considering Multi-Timescale Dynamics

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Document pages: 13 pages

Abstract: To enable power supply in rural areas and to exploit clean energy, fullyrenewable power systems consisting of cascaded run-of-the-river hydropower andvolatile energies such as pv and wind are built around the world. In islandedoperation mode, the primary and secondary frequency control, i.e., hydrogovernors and automatic generation control (AGC), are responsible for thefrequency stability. However, due to limited water storage capacity ofrun-of-the-river hydropower and river dynamics constraints, withoutcoordination between the cascaded plants, the traditional AGC with fixedparticipation factors cannot fully exploit the adjustability of cascadedhydropower. When imbalances between the volatile energy and load occur, loadshedding can be inevitable. To address this issue, this paper proposes acoordinated tertiary control approach by jointly considering power systemdynamics and the river dynamics that couples the cascaded hydropower plants.The timescales of the power system and river dynamics are very different. Tounify the multi-timescale dynamics to establish a model predictive controllerthat coordinates the cascaded plants, the relation between AGC parameters andturbine discharge over a time interval is approximated by a data-basedsecond-order polynomial surrogate model. The cascaded plants are coordinated byoptimising AGC participation factors in a receding-horizon manner, and loadshedding is minimised. Simulation of a real-life system with real-time pv datacollected on site shows the proposed method significantly reduces load lossunder pv volatility.

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