Matrix Converter Power Supply Control Phase Optimization
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Solution Overview
Problem
Existing power conversion systems face inefficiencies in output transmission due to suboptimal current phase management in multi-phase AC power supplies, leading to reduced power factor and transmission efficiency.
Innovation Solution
A power supply control device optimizes the current phase by deriving a desirable phase difference based on the rising phase of the output voltage staircase waveform and the discharge period of the snubber element, allowing for controlled switching that enhances power factor and transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional switching control is used in the matrix converter, then the switching operation is simple, but the output transmission efficiency and power factor are reduced due to suboptimal current phase management
Solution Approach 1:
The invention changes the control parameter from conventional voltage-only control to combined voltage and current phase control. By deriving and controlling the current phase to lead the voltage phase by a specific angle (obtained from the inverse sine of the ratio between fundamental wave amplitude and peak amplitude), the system optimizes the power factor and transmission efficiency without excessive complexity increase.
Solution Approach 2:
The invention implements feedback control by continuously monitoring the output voltage waveform, deriving the fundamental wave component through Fourier analysis, calculating the required current phase angle, and adjusting the switching control signals accordingly. This closed-loop feedback mechanism maintains optimal current phase management while adapting to varying operating conditions.
2Loss of energy
If soft switching technique is applied, then switching loss is reduced and conversion efficiency is improved, but the control complexity increases due to phase difference management
Solution Approach 1:
The invention applies preliminary action by pre-calculating and establishing the phase difference between voltage and current waveforms before switching operations. The control system derives the fundamental wave component and determines the optimal current phase angle in advance, ensuring that soft switching conditions are met before actual switching occurs, thereby reducing switching loss while managing control complexity through proactive phase alignment.
3Ease of operation
If the current phase is not optimized, then the control system is simpler, but the power factor and transmission efficiency are reduced
Solution Approach 1:
The invention changes the control parameter from conventional voltage-only control to combined voltage and current phase control. By deriving and controlling the current phase to lead the voltage phase by a specific angle (obtained from the inverse sine of the ratio between fundamental wave amplitude and peak amplitude), the system optimizes the power factor and transmission efficiency without excessive complexity increase.
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 optimization of current phase leads to improved power factor and output transmission efficiency by ensuring switching occurs at optimal timing, thereby increasing the effectiveness of power conversion.
Implementation Method 1
a phase difference between the voltage and the current generated by a resonant circuit provided on the output side
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
A power supply control device, a power conversion system and a power supply control method are provided so as to: control a power conversion device that has a configuration in which a resonant circuit is provided on an output side of a matrix converter including switching circuits having snubber elements, and that performs AC-AC conversion of output from a multi-phase AC power supply; optimize a phase difference of an output current; increase power factor on the output side; and improve transmission efficiency of the output. The power supply control device performs control such that: the output current, which has a phase difference caused by the resonant circuit, is negative during a period in which an absolute value of a positive-going output voltage that is output from the power conversion device increases while the output current is positive during a period in which the absolute value of a negative-going output voltage increases; and a polarity of the output current does not change within a period in which the snubber element is discharged.