Permanent Magnet Generator Fault Interruption for Short Circuits
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Solution Overview
Problem
Permanent magnet generators continue to generate power even during a short circuit, risking excessive damage to the generator and connected equipment due to uncontrolled current flow.
Innovation Solution
A power generation device is equipped with a first and second interruption circuit, along with monitoring circuits that detect excessive current and voltage levels, allowing for immediate electrical interruption between the power generator and the power conversion circuit, and between the three-phase coils and the neutral point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the permanent magnet generator continues to generate power during rotor rotation, then power generation capability is maintained, but damage risk increases when a short circuit occurs
Solution Approach 1:
The patent implements protection circuits and monitoring systems that are pre-configured to detect short circuit conditions and activate interruption circuits before excessive damage can occur. The system continuously monitors current and voltage levels, and when abnormal conditions are detected, the interruption circuits immediately disconnect the power generator from the load, preventing catastrophic failure while allowing continuous operation during normal conditions
Solution Approach 2:
The patent introduces interruption circuits as intermediary components between the power generator and the power conversion circuit. These interruption circuits act as protective mediators that can quickly isolate the power generator from the rest of the system when a short circuit is detected, preventing direct damage propagation while maintaining the ability to generate power during normal operation
2Reliability
If interruption circuits are added to prevent short circuit damage, then protection capability is improved, but device complexity increases
Solution Approach 1:
The patent designs the interruption circuits and monitoring systems to serve multiple functions: they monitor current levels, detect voltage abnormalities, control power flow interruption, and protect against various fault conditions. By making these circuits multi-functional, the patent reduces the need for separate dedicated protection devices, thereby limiting the increase in overall system complexity while maintaining comprehensive protection capabilities
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents damage from progressing due to short circuits by quickly interrupting power flow, thereby protecting the generator and connected equipment.
Implementation Method 1
The permanent magnets of the rotor always generate a magnetic flux crossing the coils of the stator. Therefore, in principle, the permanent magnet generator continues power generation as long as the rotor rotates.
Data Source
AI summary
A power generation device includes: a power generator, a power conversion circuit, a first interruption circuit, a second interruption circuit, a first monitoring circuit which monitors an output current from the power generator to the power conversion circuit and outputs a first interruption signal when an absolute value of the output current exceeds a first predetermined value, and a second monitoring circuit which monitors a total value of output voltages of respective phases of the power generator and outputs a second interruption signal when an absolute value of the total value exceeds a second predetermined value. The first interruption circuit interrupts a connection between the power generator and the power conversion circuit in accordance with the output of the first or second interruption signal. The second interruption circuit interrupts a connection between three-phase coils and the neutral point in accordance with the output of the first or second interruption signal.