一种模块化多电平变换器子模块电容容值监测方法及装置
By analyzing the square oscillation of the capacitor voltage in the submodule and designing the Lyapunov stability criterion, the shortcomings of traditional methods for monitoring the capacitance value of submodules are solved, enabling effective monitoring of the capacitance value in the MMC and improving steady-state accuracy, while reducing noise interference.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TIANJIN UNIV
- Filing Date
- 2023-06-07
- Publication Date
- 2026-07-17
AI Technical Summary
In the existing technology, the traditional submodule capacitance value monitoring method does not consider the average aging of the submodule capacitor, does not design a feedback loop for MMC, and does not design the monitoring loop estimation parameters based on the Lyapunov stability criterion, which limits the promotion and application of the submodule capacitance value monitoring method in MMC.
A method for analyzing the squared oscillation of the capacitor voltage in a submodule is proposed. A method for monitoring the capacitance value of a submodule considering asymptotic convergence error is designed. Based on the Lyapunov stability criterion, the observation parameters of the monitoring loop are designed, and the effectiveness is verified by experiments.
It provides a theoretical basis for capacitor value monitoring, reduces noise interference, improves the steady-state estimation accuracy of the submodule capacitor, and makes the estimation error asymptotically converge to zero, thus realizing effective capacitor value monitoring.
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Figure CN116559569B_ABST