Phase-Jump Power Converter Control for Variable-Frequency Loads
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Solution Overview
Problem
Variable-frequency generator power supply systems face challenges in managing significant load variations within short periods, leading to voltage and power fluctuations, which existing methods struggle to address effectively without relying on frequency variations.
Innovation Solution
A power conversion device with a power converter and controller that detects phase jump angles to adjust active power input/output, enabling load variation compensation by converting AC to DC and back to AC, using energy storage, without depending on frequency variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional load power compensation methods utilizing frequency variation are used, then load variation can be suppressed, but the system becomes dependent on frequency variation which limits effectiveness in variable-frequency systems
Solution Approach 1:
The patent changes the control parameter from frequency variation to phase variation. The phase jump angle calculator calculates the phase jump angle based on phase variation, and the drive signal generator uses this phase jump angle to control active power compensation, making the system adaptable to variable-frequency operations while maintaining effective load variation suppression
Solution Approach 2:
The patent substitutes the frequency-based control mechanism with a phase-based control mechanism. Instead of relying on frequency detectors and frequency variation control, the system uses a phase detector to detect phase jumps and controls compensation based on phase jump angle, replacing the mechanical frequency control approach with a more versatile phase control approach
2Reliability
If large energy storage capacity is used to compensate for load variations, then load power compensation effectiveness is improved, but system size and cost increase
Solution Approach 1:
The patent implements a feedback control mechanism where the phase jump angle is continuously detected and fed back to the drive signal generator. The drive signal generator adjusts the active power compensation in real-time based on the detected phase jump angle, creating a closed-loop control system that responds dynamically to load variations without requiring oversized energy storage
Solution Approach 2:
The patent introduces dynamic phase-based control that adapts to varying load conditions in real-time. The phase jump angle calculator and drive signal generator work together to provide dynamic compensation that matches actual load variation needs, avoiding the need for static oversized energy storage capacity
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 effectively suppresses load variations, voltage fluctuations, and phase jumps in AC wiring, allowing for efficient electric power compensation in variable-frequency power supply systems, reducing the need for large energy storage capacity and minimizing system size.
Implementation Method 1
a power converter configured to convert AC power inputted to the power converter through the AC wiring into DC power and charge the energy storage with the DC power, and to convert DC power inputted to the power converter through the DC wiring, the DC power being discharged from the energy storage, into AC power
Data Source
AI summary
A power converter, a voltage detector that detects a system voltage at an AC wiring side of the power converter; and a controller that performs power conversion control between AC wiring and DC wiring by transmitting a drive signal to the power converter. The controller includes: a phase calculator that calculates a current phase from the system voltage detected by the voltage detector; a phase jump angle calculator that calculates a virtual phase that follows temporal changes in the current phase in a lagging manner, and calculates a phase difference between the current phase and the virtual phase as a phase jump angle; and a drive signal generator that generates the drive signal to the power converter, which is a signal for adjusting active power that is inputted to/outputted from the power converter so as to suppress the phase jump angle.