Simulated power control for doubly-fed pumped storage units

HU Wanfeng; FAN Honggang; WANG Zhengwei

doi:10.16511/j.cnki.qhdxxb.2020.22.025

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Journal of Tsinghua University(Science and Technology) ›› 2021, Vol. 61 ›› Issue (6) : 591-600. DOI: 10.16511/j.cnki.qhdxxb.2020.22.025

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Simulated power control for doubly-fed pumped storage units

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Abstract

The control system for doubly-fed pumped storage units used to regulate the grid power was modeled using a hydraulic-mechanical-electric coupled system of the pumped storage power plant for transient process. The power control system modeled a doubly-fed induction machine (DFIM) using the stator voltage oriented vector control strategy. The model was used to study the power regulation of a 300 MW doubly-fed variable speed unit connected to an infinite bus with comparisons to a conventional fixed-speed unit with an electrically excited synchronous machine. The results show that the DFIM stator active power can be controlled directly by the rotor current so that the stator active power of the variable speed unit can accurately track the power reference. The fixed-speed unit output power is the mechanical power generated by the pump turbine, which can be changed by modifying the guide vane opening and adjusting the flow. However, the penstocks are quite long, so the flow rate and the power of the fixed-speed unit change slowly.

Key words

variable speed pumped storage unit / doubly-fed induction machine (DFIM) / power control

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HU Wanfeng, FAN Honggang, WANG Zhengwei. Simulated power control for doubly-fed pumped storage units[J]. Journal of Tsinghua University(Science and Technology). 2021, 61(6): 591-600 https://doi.org/10.16511/j.cnki.qhdxxb.2020.22.025

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