Segmented Waveform Converter for Variable-Speed Generator Frequency Control
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Solution Overview
Problem
Existing variable-speed generators face challenges in maintaining constant output frequency, leading to inefficient engine operation, increased wear, and fuel consumption, as they require fixed engine speeds to compensate for varying loads, which is not optimal for reducing wear, fuel consumption, and noise emissions.
Innovation Solution
The implementation of a segmented waveform converter, which includes a network of switches and a controller to selectively pass components of a poly-phase signal, allowing for control of both input and output voltage and frequency, enabling the engine speed to adjust while maintaining a constant output frequency, thereby optimizing efficiency and reducing wear and emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the engine operates at a fixed speed to maintain constant output frequency, then the output frequency remains stable, but the engine experiences increased wear, fuel consumption, and noise emissions
Solution Approach 1:
The patent changes the operating parameters of the engine by allowing speed to vary while using a segmented waveform converter to transform the electrical output parameters (frequency and voltage) to maintain constant frequency. This resolves the contradiction by decoupling engine speed from output frequency through parameter transformation.
Solution Approach 2:
The segmented waveform converter acts as an intermediary device between the variable-speed engine and the constant-frequency power bus. It mediates the relationship by converting the variable-frequency input from the engine into constant-frequency output, allowing the engine to operate at optimal speeds without compromising frequency stability.
2Stability of the object's composition
If the engine operates at a fixed speed to maintain constant output frequency, then the output frequency remains stable, but the engine experiences increased wear and noise emissions
Solution Approach 1:
The system changes the engine operating parameters by allowing speed to vary within an optimal range, using the segmented waveform converter to maintain constant output frequency. This reduces noise emissions by preventing the engine from operating at suboptimal speeds while preserving frequency stability.
3Loss of energy
If the engine speed is reduced at light loads to improve efficiency, then fuel consumption decreases, but the output frequency becomes variable
Solution Approach 1:
The segmented waveform converter enables parameter transformation that allows engine speed to change while maintaining constant output frequency. At light loads, the engine can operate at lower speeds to reduce fuel consumption, and the converter adjusts the electrical parameters to keep the frequency stable.
Solution Approach 2:
The system introduces dynamic operation by allowing the engine speed to vary with load conditions while the segmented waveform converter dynamically adjusts the electrical output parameters. This creates a dynamic system where fuel efficiency is optimized at each load point without sacrificing frequency stability.
4Loss of energy
If a segmented waveform converter is implemented to allow variable engine speed, then fuel consumption and wear are reduced, but the device complexity increases
Solution Approach 1:
The waveform converter uses a segmented approach where multiple switches divide the conversion process into discrete segments or stages. Each switch handles a specific portion of the waveform transformation, allowing modular implementation that balances functionality with complexity management.
Solution Approach 2:
The patent replaces traditional mechanical speed-governor systems with an electrical conversion system. Instead of mechanically controlling engine speed to maintain frequency, the system uses electronic switches and control circuits to transform the electrical output, reducing mechanical complexity while achieving the same goal.
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 solution allows for efficient engine operation at varying loads by controlling engine speed, reducing wear, fuel consumption, and noise emissions, while maintaining a constant output frequency, thus improving the overall performance and efficiency of the generator system.
Implementation Method 1
a controlled field alternator responsive to a polyphase signal from the segmented waveform converter
Implementation Method 2
The segmented waveform converter includes a network of switches and a controller to selectively pass components of a poly-phase signal
Data Source
AI summary
An apparatus includes a controlled field alternator or utility source of electrical power, a segmented waveform converter, and a controller. The source of electrical power is configured to generate a polyphase signal. The synchronous inverter includes multiple switches connected between the polyphase signal of the source of electrical power and an output filter. The controller is configured to provide a control signal for the switches based on measured electrical quantities associated with the output filter and may provide a field control signal to the controlled field alternator. The apparatus may be applied to a vehicle, a lawnmower, a zero turn radius lawnmower, or another type of machine.