Power conversion system, control method of power conversion system and power system
By using the inverter and DC bus capacitor to form a discharge circuit and chopping in the power conversion system, the problem of rapid and safe discharge of DC bus capacitors is solved, and an efficient and safe discharge process is achieved, which improves the utilization rate and cost-effectiveness of the system.
CN114629370BActive Publication Date: 2025-02-28SUNGROW POWER SUPPLY CO LTD
Patent Information
- Application Number
- CN202210322013.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-03-29
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2042-03-29
AI Technical Summary
Technical Problem
When the prior art realizes fast and safe discharge of DC bus capacitors, there are problems such as large losses, low conversion efficiency and short electrical life of mechanical switches.
Method used
When both the DC switch and the grid-connected switch are in the off state, the inverter in the power conversion system forms a discharge loop with the DC bus capacitor and chops it to achieve discharge. Optionally, a slow start circuit is used to form a discharge loop with the DC bus capacitor.
Benefits of technology
It realizes redundant, fast and safe discharge of DC bus capacitors, improves the utilization rate of inverter components, reduces system devices and production costs, and simplifies the wiring of the control board circuit.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN114629370B_ABST
Abstract
The present invention discloses a power conversion system, a control method of the power conversion system and an electric power system. The power conversion system includes: a DC switch, the input end of the DC switch is used to access a DC power supply; a grid-connected switch, the output end of the grid-connected switch is used to access an AC power grid; a DC bus capacitor connected to the output end of the DC switch; an inverter, the input end of the inverter is connected to the output of the DC switch, and the output end of the inverter is connected to the grid-connected switch; the inverter is used to form a discharge loop with the DC bus capacitor when the power conversion system is shut down and the DC switch and the grid-connected switch are both in a disconnected state, and to perform chopping to discharge the DC bus capacitor. The present invention realizes redundant, fast and safe discharge of the DC bus capacitor.
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Citation Information
Patent Citations
Slow start circuit and optical module with same
CN104218927A
Bus capacitor discharge method, controller, DCDC converter and inverter
CN105932867A