Brushless PMG Voltage Source for Constant Exciter Field
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Solution Overview
Problem
Traditional AC power generation systems with permanent magnet generators experience significant voltage decay upon load acceptance, leading to slow response times and instability in the grid, necessitating improved load acceptance characteristics.
Innovation Solution
The implementation of a brushless permanent magnet generator voltage source and a second voltage source, combined with an automatic voltage regulator and power converter, provides a supplemental voltage supply to maintain a constant exciter field, enhancing response times and stability by rectifying and controlling voltage inputs at differing frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a permanent magnet generator is used as a power source for the exciter field, then the system structure is simplified, but the voltage supplied decays substantially upon load acceptance resulting in slow response time
Solution Approach 1:
The invention segments the voltage supply system into two independent sources: a permanent magnet generator (PMG) and a second voltage source (such as a battery or capacitor). This segmentation allows each source to contribute differently - the PMG provides continuous power while the second voltage source provides immediate supplemental power during transient events, thereby reducing response time without significantly increasing overall system complexity.
Solution Approach 2:
The second voltage source is pre-charged and positioned in parallel with the PMG output before load events occur. This preliminary preparation enables the second voltage source to immediately supply supplemental voltage upon load acceptance or rejection events, eliminating the delay associated with voltage decay and recovery in traditional single-source systems.
2Device complexity
If a permanent magnet generator is used as a power source for the exciter field, then the system is simpler, but the voltage decay leads to grid instability
Solution Approach 1:
The second voltage source acts as a cushion or buffer that compensates for voltage decay in the PMG output. By positioning this supplemental voltage source in parallel with the PMG, the system creates a protective layer that prevents voltage drops from propagating to the exciter field, thereby maintaining grid stability during transient events without requiring complex control systems.
3Loss of time
If supplemental voltage is provided to maintain constant exciter field, then response time is improved, but device complexity increases
Solution Approach 1:
The invention merges the PMG and second voltage source in a parallel configuration with unified output to the exciter field. This merging approach allows both sources to work together seamlessly, with the second voltage source simply adding supplemental power during transient events. The parallel architecture minimizes additional complexity compared to series configurations or complex power electronic converters, as it primarily requires parallel connection circuitry and basic voltage regulation.
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
This configuration enhances load acceptance and rejection characteristics, achieving faster response times and stability by maintaining a constant voltage supply to the exciter field, thereby improving the AC power generation system's ability to handle grid events.
Implementation Method 1
a power converter configured to rectify voltage inputs received from a permanent magnet generator and a second voltage source at differing frequencies
Implementation Method 2
a brushless permanent magnet generator voltage source configured to generate a first voltage at a first frequency
Data Source
AI summary
An alternating current power generation system including an alternating current generator comprising an exciter, a brushless permanent magnet generator voltage source configured to generate a first voltage at a first frequency, a second voltage source configured to generate a second voltage at a second frequency, and a coil. Further, the brushless permanent magnet generator voltage source provides the first voltage as a supplemental voltage supply combined with the second voltage source at the coil to generate a constant exciter field received by the exciter of the alternating current generator.