Active Rectification Control for Aircraft Power Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In aircraft power systems, achieving a power factor close to 1 while minimizing input current harmonics is crucial due to weight restrictions, but existing active rectification systems struggle to optimize both efficiency and weight effectively.
Innovation Solution
An active rectification system incorporating a pulse width modulation (PWM) control portion and a closed-loop vector control mechanism that detects phase angle and frequency to transform input currents into d-q components, determining duty cycles for PWM signals to align three-phase input currents with input pole voltages, thereby regulating DC voltage and improving power factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If active rectification is used to improve power factor and reduce harmonics, then power quality improves, but system complexity increases
Solution Approach 1:
The patent implements a closed-loop control system that continuously monitors the DC-link voltage and adjusts the PWM switching signals accordingly. The control portion receives feedback about the actual DC voltage level and modifies the rectifier operation to maintain the voltage within desired limits, thereby achieving both power quality improvement and stable voltage regulation without excessive complexity
Solution Approach 2:
The patent replaces traditional mechanical or simple electronic voltage regulation methods with a microprocessor-based control system. The control portion uses digital signal processing to generate PWM signals and implement closed-loop control, substituting complex discrete circuitry with programmable logic that achieves the same functions with reduced hardware complexity
2Stability of the object's composition
If DC voltage is regulated through active control, then voltage stability improves, but control complexity increases
Solution Approach 1:
The control portion continuously monitors the DC-link voltage and compares it with reference values. Based on the voltage deviation, the control algorithm adjusts the PWM duty cycles to regulate the DC voltage, implementing automatic feedback control that maintains voltage stability without requiring complex manual intervention or oversized passive components
Solution Approach 2:
The patent implements dynamic voltage regulation that adapts to changing load conditions and input voltage variations. The control system adjusts its operation in real-time based on instantaneous system state, transitioning between different control modes as needed to maintain optimal DC voltage levels under varying operating conditions
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An active rectification system (100) includes an active rectifier (102), a pulse width modulation (PWM) control (101), and a closed loop vector control (400). The PWM control portion (101) is configured to control switching of the active rectifier and the closed loop vector control is configured to generate the required duty cycles for the PWM signals that regulate the DC voltage output and force a three-phase current input of the active rectifier to align with a three-phase pole voltage input of the active rectifier.