新能源逆变器内部阀电流与阀电压的虚拟量测方法及系统
By establishing the current and voltage equations of the inverter and combining them with the valve state matrix, the valve state is determined by using the valve trigger pulse and AC current characteristics. This solves the problem of the difficulty in accurately measuring valve current and voltage in new energy inverters, improves the system's fault analysis and control protection capabilities, and reduces the risk of grid disconnection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SOUTH CHINA UNIV OF TECH
- Filing Date
- 2025-07-07
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies make it difficult to accurately determine the valve current and valve voltage in new energy inverters using virtual measurement techniques. This makes it easy for new energy systems to experience cascading grid disconnections after fault disturbances, affecting the safe and stable operation of the power system.
By collecting the three-phase AC current, DC current and voltage of the inverter and the valve trigger pulse, and combining the inverter topology, current and voltage equations are established, a state matrix is constructed, and the valve state is determined by the valve trigger pulse and AC current amplitude characteristics. The current and voltage of the IGBT and freewheeling diode inside the valve are then solved.
It enables precise virtual measurement of valve current and voltage in new energy inverters, provides support for fault analysis and control protection, reduces the risk of new energy systems disconnecting from the grid, and improves the safety and stability of the power system.
Smart Images
Figure CN121068984B_ABST