A flexible excitation transient reactive power modeling method considering VSC dynamics
By constructing a transient reactive power model of a flexible excitation system that takes into account the dynamic characteristics of VSC and the DC-DC control law, the problem of insufficient description of the transient characteristics of the flexible excitation system under large disturbance conditions is solved, and a precise theoretical basis for the transient voltage stability analysis and control strategy of synchronous generators is realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA UNIV OF MINING & TECH
- Filing Date
- 2026-03-23
- Publication Date
- 2026-07-17
AI Technical Summary
In the existing technology, the transient characteristics of flexible excitation systems under large disturbance conditions are not adequately described, and their reactive power support mechanism cannot be accurately revealed, which affects the transient voltage stability analysis and control strategy design of synchronous generators.
By constructing a transient reactive power model of a flexible excitation system that takes into account the dynamic characteristics of VSC and the control law of DC-DC, and combining the energy conservation of AC and DC sides with a simplified model of DC-DC controller, mathematical expressions for DC side voltage and duty cycle are derived, a stator current increment model is constructed, and the change in generator terminal voltage is combined to calculate transient reactive power.
The reactive power support mechanism of the system under large disturbances is clearly revealed, and the technical effectiveness of VSC dynamic response characteristics and DC-DC control is clarified. The effectiveness of implementing the above technical means demonstrates its practical contribution to solving technical problems.
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