High-inertia doubly-fed motor unit and control method thereof

By designing a high-inertia double-feed motor unit and its control method, the problem of insufficient frequency stability and dynamic reactive support caused by the grid connection of new energy is solved, and the system's active frequency support and operating stability are improved.

CN119651795AActive Publication Date: 2025-03-18ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID JIBEI ELECTRIC POWER CO LTD +2
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Patent Information

Application Number
CN202411706262.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-26
Publication Date
2025-03-18
Estimated Expiration
2044-11-26

AI Technical Summary

Technical Problem

The problems of decreasing short-circuit capacity, reduced system inertia and active frequency stability, insufficient dynamic reactive support and increased risk of voltage over-limiting.

Method used

A high-moment inertia double-feed motor unit is designed, including a high-moment inertia rotor, a rotor-side converter, a grid-side converter and a step-up transformer, and a corresponding control method is provided to provide active frequency support for the system by releasing the rotor kinetic energy in the event of an AC system failure.

Benefits of technology

Through the design and control method of high-inertia double-feed motor unit, the active frequency stability of the system can be effectively improved, dynamic reactive support can be provided, the risk of voltage overload and the overall operating stability of the system can be improved.

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Abstract

The invention provides a high-inertia doubly-fed motor unit and a control method thereof, and the corresponding control method comprises the steps: determining a first active instruction value of a rotor side converter according to a preset rotating speed instruction value of a doubly-fed motor when an AC system where the high-inertia doubly-fed motor unit is located is in a normal operation state; when the alternating current system where the high-inertia doubly-fed motor unit is located is in a fault operation state, determining a second active instruction value of the rotor side converter according to the rated power of the doubly-fed motor; and when the alternating current system is converted from the fault operation state to the normal operation state, determining a third active instruction value of the rotor side converter according to the current rotating speed of the rotor of the doubly-fed motor. High rotor kinetic energy is stored by the doubly-fed motor with the rotor with high rotational inertia, and active frequency support is provided for the system by releasing the rotor kinetic energy when the system breaks down.
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