A method, apparatus, and system for relay fault detection of an inverter system
By detecting the voltage difference of the relay unit in the inverter system and using preset conditions to determine the fault type, the problem of long relay fault detection time in the prior art is solved, and fast and accurate fault diagnosis is achieved.
CN116165531BActive Publication Date: 2026-06-23HOYMILES POWER ELECTRONICS INC
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Patent Information
- Application Number
- CN202211733079.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-12-30
- Publication Date
- 2026-06-23
- Estimated Expiration
- 2042-12-30
AI Technical Summary
Technical Problem
Existing inverter systems have long relay fault detection times and complex detection methods, making it impossible to quickly determine relay sticking or non-engaging faults.
Method used
By detecting the voltage difference across the grid-connected, off-grid, and bypass relay units, it can be determined whether the relays are properly open or closed. Preset conditions can be used to determine the fault type, thus shortening the detection time.
Benefits of technology
By using a single voltage difference measurement, it is possible to quickly determine whether the grid-connected and off-grid relay units have disconnected normally, thus shortening the fault detection time and improving detection efficiency.
✦ Generated by Eureka AI based on patent content.
Abstract
The application relates to a relay fault detection method, device and system of an inverter system, wherein the method comprises the following steps: detecting a first voltage difference of voltages on two sides of a bypass relay unit, and judging whether the first voltage difference meets a first preset condition; if yes, closing a relay of the bypass relay unit, detecting a second voltage difference of voltages on two sides of the bypass relay unit, and judging whether the second voltage difference meets a second preset condition; if yes, detecting a third voltage difference of voltages on two sides of an off-grid relay unit, and judging whether the third voltage difference meets a third preset condition; if yes, closing a relay of an on-grid relay unit, detecting a fourth voltage difference of voltages on two sides of the off-grid relay unit, and judging whether the fourth voltage difference meets a fourth preset condition; and if yes, the inverter system enters an on-grid working mode. According to the application, the detection time of the relay fault detection of the inverter system is shortened.
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