Method for calculating direct current magnetic bias current of flexible direct current transformer and related device

By constructing a resonant analysis model and a multi-terminal electromagnetic transient simulation model, the DC bias current of the flexible direct current transformer in a flexible DC transmission system is solved, and the calculation problems in the existing technology are ensured to ensure the safety and stability of the system.

CN119670434AActive Publication Date: 2025-03-21ELECTRIC POWER RES INST CHINA SOUTHERN POWER GRID CO LTD +1
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Patent Information

Application Number
CN202411812027.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-10
Publication Date
2025-03-21
Estimated Expiration
2044-12-10

AI Technical Summary

Technical Problem

The prior art is difficult to effectively calculate the DC bias current of the flexible direct current transformer in a flexible DC transmission system, resulting in equipment saturation, heating vibration, affecting the safety and stability of the system.

Method used

By constructing a resonant analysis model of the DC loop of the converter of the flexible DC transmission system, the impedance at 50Hz is obtained and whether it is less than the set threshold value. If it is less than, the time domain simulation calculation is performed using the multi-terminal DC detailed electromagnetic transient simulation model to obtain the DC bias current of the flexible direct transformer.

Benefits of technology

The accurate calculation of the DC bias current of the flexible direct current transformer in the flexible direct current transmission system is realized, and the risk of excessive current is judged in advance to ensure the safe and stable operation of the system and equipment.

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Abstract

The invention provides a flexible DC transformer DC magnetic bias current calculation method and a related device. The method comprises the following steps: acquiring a resonance analysis model of a DC loop of a converter of a flexible DC power transmission system; the resonance analysis model is constructed based on a physical structure of a DC loop of a converter of the flexible DC power transmission system; obtaining the impedance at 50Hz in the resonance analysis model through frequency scanning, and judging whether the impedance is smaller than a set threshold value or not; if yes, performing time domain simulation calculation by using a multi-terminal direct current detailed electromagnetic transient simulation model to obtain a direct current magnetic bias current of the flexible direct current transformer; the multi-terminal direct current detailed electromagnetic transient simulation model is used for simulating the electromagnetic transient process of the multi-terminal flexible direct current power transmission system. According to the method, the impedance at 50Hz is judged by constructing the direct-current loop resonance analysis model, and then the direct-current magnetic bias current is calculated by utilizing the electromagnetic transient simulation model, so that the direct-current magnetic bias risk of the flexible direct-current transformer can be effectively evaluated.
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