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The hydroelectric pumped storage is one of the most sustainable solutions to store electrical energy for optimizing the grid operation. However, the pump motor starting may constitute a significant issue for the power plant. Indeed, the motor’s large power and the long power lines (needed for connecting remotely located plants to the grid) may prevent a direct-on-line start. On the other hand, constraints as spaces availability in the powerhouse, and time and cost availability (especially for revamping projects) limit the feasibility of other starting methods. In this paper, a novel starting method is proposed for the revamping of a hydroelectric power plant (HPP), where a synchronous machine is used to drive the pump. On the basis of the power plant characteristics, an enhanced version of the synchronous starting with partial frequency variation is proposed, leading to the creation of a startup sequence capable of being integrated into the existing excitation control systems’ software (of both the generator and the motor installed in the power plant). Such Enhanced Partial Frequency Variation (EPFV) starting method combines the advantages of back-to-back starting method to the ones of asynchronous starting, without requiring additional equipment in respect to a conventional direct-on-line start solution. This is enabled by the model-based design approach here applied, which allows to determine the correct set of parameters and variables’ thresholds required for the machine startup, taking into account the specific characteristics of the HPP in study. The developed starting sequence, implemented into the real HPP by using the capabilities of the existing digital excitation control systems, allowed the correct starting of the motor. This is demonstrated by experimental data obtained during the 5MVA motor starting tests. The results also prove the effectiveness of the model-based design approach in enabling the definition of the pump starting sequence, as well as validating the mathematical model used for the sequence design.
Andrea Vicenzutti; Massimiliano Chiandone; Vittorio Arcidiacono; Giorgio Sulligoi. Enhanced partial frequency variation starting of hydroelectric pumping units: Model based design and experimental validation. International Journal of Electrical Power & Energy Systems 2021, 131, 107083 .
AMA StyleAndrea Vicenzutti, Massimiliano Chiandone, Vittorio Arcidiacono, Giorgio Sulligoi. Enhanced partial frequency variation starting of hydroelectric pumping units: Model based design and experimental validation. International Journal of Electrical Power & Energy Systems. 2021; 131 ():107083.
Chicago/Turabian StyleAndrea Vicenzutti; Massimiliano Chiandone; Vittorio Arcidiacono; Giorgio Sulligoi. 2021. "Enhanced partial frequency variation starting of hydroelectric pumping units: Model based design and experimental validation." International Journal of Electrical Power & Energy Systems 131, no. : 107083.
The increasing presence of nonprogrammable renewable energy sources (RES) forces towards the development of new methods for voltage control. In the case of centralized generation, the hierarchical regulation or secondary voltage regulation (SVR) is guaranteed by coordinated voltage and reactive power controls in transmission systems. This type of regulation loses effectiveness when the generation becomes distributed and based on small and medium sized generators. To overcome this problem, it is important that also distributed generators, typically based on RES, participate in the voltage regulation. By starting from the methodologies already applied, this work wants to present a new method for involving distributed generators in SVR. The novelty is given by the application of an existing methodology to the new configuration of electrical grids characterized by a relevant distributed generation. The aim is to control the distributed generators (DGs) as coordinated sources of reactive power for conveniently supporting the voltage regulation. In this paper, a real large photovoltaic (PV) plant is considered. The power plant is composed of several PV generators connected through a distribution network. With the algorithm proposed, the set of generators can be treated as a single traditional power plant that can participate in the hierarchical voltage regulation. The reactive power of each single generator is coordinated in a way similar to the SVR used in several national systems.
Massimiliano Chiandone; Riccardo Campaner; Daniele Bosich; Giorgio Sulligoi. A Coordinated Voltage and Reactive Power Control Architecture for Large PV Power Plants. Energies 2020, 13, 2441 .
AMA StyleMassimiliano Chiandone, Riccardo Campaner, Daniele Bosich, Giorgio Sulligoi. A Coordinated Voltage and Reactive Power Control Architecture for Large PV Power Plants. Energies. 2020; 13 (10):2441.
Chicago/Turabian StyleMassimiliano Chiandone; Riccardo Campaner; Daniele Bosich; Giorgio Sulligoi. 2020. "A Coordinated Voltage and Reactive Power Control Architecture for Large PV Power Plants." Energies 13, no. 10: 2441.