An electrical main wiring structure and control method of a flexible full-power variable-speed pumped storage unit

By using the electrical main wiring structure of the flexible full-power variable speed pumped storage unit, combined with converters of bidirectional DC-DC topology and multi-level topology, the unit achieves cost savings and reduced footprint, improves operating efficiency and stability, and meets the rapid regulation requirements of the power system.

CN122118835APending Publication Date: 2026-05-29POWERCHINA ZHONGNAN ENG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
POWERCHINA ZHONGNAN ENG
Filing Date
2026-01-21
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The existing electrical main wiring structure of full-power variable speed pumped storage units has problems such as high equipment purchase and construction costs, large footprint, and insufficient operating efficiency and stability.

Method used

The electrical main wiring structure of the flexible full-power variable speed pumped storage unit includes a first main circuit and a DC excitation circuit. The DC excitation device with a bidirectional DC-DC topology is connected to the DC link of the main circuit. Combined with the converter with MMC and NPC topologies, a bypass circuit is configured to achieve constant speed and variable speed operation. A hybrid energy storage device is integrated to regulate the excitation voltage and power.

Benefits of technology

It significantly reduces equipment purchase and construction costs, reduces floor space, improves operating efficiency and stability, and can flexibly adjust active and reactive power, thereby improving the system's transient stability and frequency regulation capabilities.

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Abstract

The present application relates to pumped storage power station technical field, disclose a kind of flexible full-power variable-speed pumped storage unit's electrical main wiring structure and control method, structure includes first main circuit and direct current excitation circuit;The first main circuit includes main transformer, second voltage transformer, second current transformer, network side resistance-capacitance filter device, network side converter, direct current link, machine side converter, machine side resistance-capacitance filter device, pre-charging device, first voltage transformer and first current transformer in series;The direct current excitation circuit includes direct current excitation device, the input end of the direct current excitation device is connected with direct current link, and the output end is connected with the rotor of generator motor.The organic integration of the direct current excitation device and unit main circuit not only greatly saves the high equipment purchase and construction cost required by traditional excitation scheme, but also significantly compresses the overall land area of equipment.
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