Capacitor-Compensation Generator Speed Control for Voltage Stability
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Solution Overview
Problem
Capacitor-compensation-type generators experience unstable output voltage and frequency fluctuations with changes in engine speed and load, making them unsuitable for consistent power delivery.
Innovation Solution
Incorporating an engine speed detector, output voltage detector, and actuator controller to manage engine speed through a stepper motor, allowing for constant voltage and frequency operation modes, where the engine speed is controlled to maintain desired voltage or frequency levels using PID control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the generator uses a simple capacitor-compensation structure without brushes or slip rings, then the device complexity is reduced and manufacturing cost decreases, but the output voltage stability deteriorates and frequency control becomes insufficient
Solution Approach 1:
The patent implements feedback control by detecting engine speed with a speed detector and output voltage with a voltage detector, then using an actuator controller to adjust the engine speed via an actuator. This closed-loop feedback system maintains stable output voltage and frequency despite load variations, resolving the contradiction between simple structure and voltage stability.
Solution Approach 2:
The patent introduces dynamic control capabilities by enabling the engine speed to be actively adjusted through an actuator based on detected voltage and speed parameters. This transforms the static generator system into a dynamic one that can adapt to changing load conditions, maintaining stable output without increasing fundamental structural complexity.
2Adaptability or versatility
If the engine speed varies with load changes, then the generator structure remains simple and responsive, but the output voltage fluctuates and frequency control becomes insufficient
Solution Approach 1:
The feedback control system continuously monitors output voltage and engine speed, then adjusts the engine speed via the actuator to compensate for load variations. This maintains stable output voltage and frequency while preserving the generator's ability to respond to different load conditions, resolving the contradiction between adaptability and voltage stability.
Solution Approach 2:
The patent changes the operating parameters (engine speed) dynamically based on detected voltage and speed levels. By adjusting the engine speed parameter in response to load changes, the system maintains stable output characteristics while adapting to varying operational conditions.
3Ease of operation
If the generator operates without speed control, then the ease of operation is improved and device complexity is reduced, but the productivity and energy efficiency deteriorate due to unstable output
Solution Approach 1:
The generator system performs self-regulation by automatically detecting its own operating parameters (speed and voltage) and adjusting accordingly through the actuator controller. This self-service capability maintains stable output and improves energy efficiency without requiring complex external control systems, preserving ease of operation.
Solution Approach 2:
The automatic feedback control system monitors and adjusts engine speed based on detected parameters, eliminating the need for manual intervention. This maintains operational simplicity while improving productivity and energy efficiency through stable output and optimized engine operation.
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 stabilizes AC power output voltage and frequency, enhancing fuel efficiency and reducing noise, while allowing for user-selectable operation modes to meet specific power requirements.
Implementation Method 1
an exciting winding that is disposed at predetermined phase angle with respect to the output winding and is short-circuited with a phase advance capacitor
Implementation Method 2
field current (which is produced in the field winding by armature reaction) is rectified by the diode
Implementation Method 3
rotating field is produced by DC magnetizing the rotor (field), which is rotated by the engine, to the N-pole and S-pole
Implementation Method 4
The output winding wound around the stator crosses the flux generated from the rotating field of the rotor, thereby producing AC power
Data Source
AI summary
In a capacitor-compensation-type generator having a rotor wound with a field winding, a stator wound with an output winding adapted to cross flux generated by the field winding to output AC power, and an internal combustion engine that drives the rotor to rotate relative to the stator, there are equipped with an actuator that changes the engine speed and an actuator controller that controls operation of the actuator in accordance with a constant voltage operation mode in which the engine speed is controlled to a desired speed such that a detected output voltage becomes a desired voltage, or a constant frequency operation mode in which the detected engine speed is controlled to a predetermined speed such that frequency of AC power outputted from the output winding becomes a desired frequency, thereby enabling to output AC power at constant voltage or frequency.