Inverter Oscillation Suppression via Active Control Correction
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Solution Overview
Problem
Existing electrical supply systems for electric vehicles experience unwanted high-frequency oscillations when two inverters are powered from a shared voltage source, leading to increased electrical losses and thermal stress, which are typically suppressed using electrolytic capacitors and ferrite rings, but these methods result in inefficiencies and additional costs.
Innovation Solution
An electrical supply system with an oscillation suppression controller and correction modules that generate control variables based on operating parameters and voltage/current feedback to counteract oscillations, eliminating the need for passive attenuation measures like ferrite rings and reducing energy losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If electrolytic capacitors are used to suppress oscillations, then oscillation suppression is improved, but electrical losses and thermal stress increase
Solution Approach 1:
The patent changes the control parameters of the inverter by introducing a correction value to the control variable. This active parameter adjustment modifies the inverter's switching behavior to counteract oscillations, replacing the passive energy-dissipating approach of electrolytic capacitors with an intelligent control strategy that maintains system stability without excessive energy losses.
Solution Approach 2:
The patent implements a feedback mechanism where the control system continuously monitors the system state and generates correction values based on detected oscillations. This closed-loop feedback enables real-time adjustment of the inverter control variables, allowing the system to actively suppress oscillations rather than passively attenuating them through resistive elements.
2Stability of the object's composition
If ferrite rings are used to attenuate high frequencies, then oscillation suppression is improved, but electrical losses and thermal stress increase
Solution Approach 1:
The patent replaces the passive mechanical/physical oscillation suppression method (ferrite rings) with an electronic control system. Instead of using magnetic materials to physically attenuate high-frequency oscillations, the system uses electronic correction values applied to the inverter control variables, achieving oscillation suppression through intelligent control rather than physical damping elements.
3Stability of the object's composition
If passive attenuation measures are used, then oscillation suppression is improved, but device complexity and cost increase
Solution Approach 1:
The patent integrates oscillation suppression functionality into the existing inverter control system by adding a correction value generation mechanism. Rather than introducing separate passive attenuation components, the solution uses the inverter's existing control infrastructure to perform dual functions: normal motor control and oscillation suppression, thereby reducing overall system complexity and component count.
Data Source
AI summary
An electrical supply line for operating a first electric motor includes a first converter for supplying electric energy to the first electric motor in dependence of a first control variable, a connected network connecting the first converter to a DC voltage source, an oscillation suppression controller for generating first correction information, and a first correction module for generating the first control variable by taking into consideration an operating parameter of the first electric motor and by taking into consideration the first correction information. An electrical supply system includes two of the supply lines. A corresponding method for operating an electric drive is also described.