Single-Phase Generator Phase Angle Control for Power Regulation
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Solution Overview
Problem
Existing power generation systems using three-phase synchronous generators are complex and costly due to the need for multiple rotor angle sensors and magnet rings, leading to inefficiencies in power output regulation across varying engine speeds.
Innovation Solution
A single-phase alternating-current generator with a crank angle detector, a bridge-connected rectifier, and an energization controller that performs retard and advance angle control to optimize power output based on crank angle signals, eliminating the need for additional angle sensors and simplifying the system structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a three-phase synchronous generator with multiple rotor angle sensors and magnet rings is used, then power generation control capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates the complex three-phase sensor system and magnet rings from the generator structure. Instead of using multiple rotor angle sensors and magnet rings as in conventional three-phase synchronous generators, the invention uses a single-phase generator with simplified sensing, directly resolving the technical contradiction by removing unnecessary components while maintaining control capability.
Solution Approach 2:
The single-phase generator in the patent performs multiple functions: it serves as both the power generation source and the control reference through its induced voltage phase. The single-phase generator replaces the specialized three-phase generator system, achieving both power generation and control signal provision with a single component, thereby reducing overall system complexity.
2Power
If generator power capacity is increased to satisfy low-speed rotation requirements, then power generation at low engine speeds is improved, but power loss increases during high-speed rotation
Solution Approach 1:
The patent applies dynamic control through phase angle adjustment of the induced voltage. By dynamically changing the phase angle of the single-phase generator's induced voltage based on engine speed conditions, the system optimizes power generation at each operating point. This dynamic phase control allows the generator to deliver appropriate power levels without excessive capacity, reducing energy loss during high-speed operation while maintaining sufficient output at low speeds.
Solution Approach 2:
The invention changes the phase angle parameter of the induced voltage to control power output. By adjusting the phase angle of the single-phase generator's induced voltage in response to engine speed variations, the system achieves adaptive power control. This parameter change approach enables the generator to match power output to actual requirements across different operating conditions, avoiding both power deficiency at low speeds and excessive power loss at high speeds.
3Loss of energy
If generator power capacity is reduced to match high-speed rotation requirements, then power loss during high-speed rotation is reduced, but power generation becomes insufficient during low-speed rotation
Solution Approach 1:
The system uses dynamic phase angle control to adjust power output based on real-time engine speed conditions. The single-phase generator's induced voltage phase is continuously adjusted to match optimal power generation points, enabling the reduced-capacity generator to deliver sufficient power at low speeds without requiring excessive capacity that would cause losses at high speeds.
Solution Approach 2:
The invention changes the phase angle parameter of the induced voltage to compensate for reduced generator capacity. By optimizing the phase angle at different engine speeds, the system maximizes power generation efficiency at each operating point, allowing a smaller generator to meet low-speed power requirements without creating excessive power loss during high-speed operation.
4Measurement precision
If multiple rotor angle sensors and magnet rings are installed, then control precision is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent removes the complex array of multiple rotor angle sensors and magnet rings from the system. By eliminating these redundant sensing components and using the single-phase induced voltage phase as the reference, the invention achieves angle detection functionality without the complexity and cost of multiple sensors, directly resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The single-phase induced voltage serves multiple purposes: it provides the power generation output and simultaneously serves as the phase reference for control. This eliminates the need for separate angle sensing systems with multiple sensors and magnet rings, achieving both power generation and angle reference functions with a single component, thereby reducing complexity while maintaining control precision.
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 power generation that matches required power levels across low and high engine speeds, reducing power loss and system complexity while minimizing size and cost.
Implementation Method 1
a single-phase alternating-current generator that is rotated by a rotation of a crankshaft of the engine
Implementation Method 2
a rectifier that includes a bridge connection of a plurality of switching elements and converts alternating-current power generated by the single-phase alternating-current generator into direct-current power
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A rectifier (3) of a power generation device converts alternating-current power generated by a single-phase alternating-current generator (2) into direct-current power. A CPU performs retard angle control and advance angle control that respectively retard and advance energization switching timing by a plurality of FETs of a rectifier (3) with respect to a phase of an induced voltage of the single-phase alternating-current generator (2) based on crank pulses that are output from a crank angle sensor. Thus, the direct-current power obtained by the rectifier (3) is controlled.