Electric Power Converter Input Power Factor Control
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Solution Overview
Problem
Existing electric power converters struggle to provide sufficient voltage to motors operating at high speeds, limiting their ability to drive efficiently in high-speed ranges.
Innovation Solution
The implementation of a control unit that generates an input power factor command value based on the motor's operating conditions, allowing for the control of the input power factor of the generator, thereby increasing the input voltage and ensuring stable high-voltage supply to motors at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional electric power converters are used, then the system structure is simple, but the input voltage is insufficient for high-speed motor operation
Solution Approach 1:
The patent changes the operating parameters of the electric power converter by dynamically adjusting the input power factor command value based on motor speed and load conditions. By modifying the power factor parameter, the system achieves higher input voltage capability without adding physical voltage boosting equipment, thus resolving the contradiction between voltage strength and device complexity
Solution Approach 2:
The system implements dynamic control of the input power factor that adapts to varying motor operating conditions. The control unit continuously adjusts the power factor command value based on real-time motor speed and load information, enabling the converter to maintain optimal voltage levels across different operating points without requiring complex static voltage multiplication circuits
2Speed
If the input power factor is controlled to increase input voltage, then high-speed motor operation is enabled, but the control complexity increases
Solution Approach 1:
The control unit employs feedback mechanisms by monitoring motor speed and load conditions, then using this information to determine the appropriate input power factor command value. This closed-loop approach enables high-speed operation while managing control complexity through systematic parameter adjustment based on actual operating conditions
Solution Approach 2:
The system performs preliminary calculation and determination of the input power factor command value based on expected operating conditions. By pre-determining optimal power factor values for different operating ranges, the control complexity is reduced while still enabling high-speed motor operation when needed
3Strength
If traditional voltage boosting equipment is added, then sufficient voltage for high-speed operation is achieved, but the system cost and complexity increase
Solution Approach 1:
Instead of adding physical voltage boosting equipment, the patent achieves the required voltage strength by changing the operational parameters of the existing electric power converter. By adjusting the input power factor parameter dynamically, the system extracts maximum voltage capability from the existing converter topology, avoiding the need for additional reactors, converters, or voltage multiplication circuits
Solution Approach 2:
The electric power converter serves itself by utilizing its existing components to generate the required high input voltage through intelligent control. The converter's switching network and filtering components are used in an optimized manner to achieve voltage boosting functionality without requiring external assistance from additional voltage multiplication equipment
Data Source
AI summary
An electric power converter, electric power converter controlling method and electric power converting system for converting multi-phase alternating-current inputted from a generator and outputting multi-phase alternating current for controlling a drive of a motor. An input power factor commanding section outputs a command value of an input power factor according to an operating condition of the motor, and an input power factor controlling section controls the input power factor of the generator on the basis of the command value of the input power factor from the input power factor commanding section.