Power Converter Control for Compressor Vibration and Harmonics
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Solution Overview
Problem
Existing power converter technologies fail to prevent an increase in harmonic components of the power supply current while compensating for torque ripple in motors, leading to potential failures and non-compliance with harmonic standards.
Innovation Solution
A power converter system that includes a converter, a capacitor, an inverter, and a controller, where the controller performs two control functions: reducing vibration of the load and minimizing the ripple component of the capacitor output current to prevent harmonic increases, by causing a controlled loss in the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If torque ripple compensation control is performed to reduce load vibration, then vibration reduction is achieved, but harmonic components of the power supply current increase
Solution Approach 1:
The patent changes the parameter of capacitor output current by introducing a ripple reduction control component that adjusts the current waveform. This control modifies the current parameters to eliminate the imbalance between positive and negative polarities, thereby reducing harmonic components while maintaining vibration reduction effectiveness
Solution Approach 2:
The patent introduces an intermediary control mechanism (ripple reduction control) that acts between the torque ripple compensation control and the power supply current. This intermediary control processes the capacitor output current to eliminate harmful harmonics while preserving the beneficial vibration reduction effects
2Object-affected harmful factors
If torque ripple compensation is applied to reduce load vibration, then vibration reduction is achieved, but power supply current balance deteriorates
Solution Approach 1:
The patent changes the parameter of capacitor output current by introducing a ripple reduction control component that adjusts the current waveform. This control modifies the current parameters to eliminate the imbalance between positive and negative polarities, thereby maintaining current balance while achieving vibration reduction
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 prevents the increase in harmonic components of the power supply current, ensuring compliance with harmonic standards and improving the efficiency and reliability of the motor drive apparatus.
Implementation Method 1
a converter that rectifies a power supply voltage applied from an alternating current power supply
Data Source
AI summary
A power converter includes a converter that rectifies a power supply voltage applied from an alternating current power supply, a capacitor connected to an output end of the converter, an inverter connected across the capacitor, and a controller that controls an operation of the inverter. The controller performs first control of reducing vibration of a compressor and performs second control of reducing a ripple component of a capacitor output current that is output from the capacitor to the inverter. The second control is control for causing a loss in a motor.