Decoupling Control for Salient Pole Synchronous Motor Harmonic Currents
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Solution Overview
Problem
Traditional methods for controlling harmonic currents in salient pole synchronous motors fail to achieve complete decoupling, leading to reduced control accuracy and response speed due to dynamic coupling between harmonic currents.
Innovation Solution
A decoupling control system that includes a harmonic current detection module, linear transformation module, harmonic current decoupling control module, inversely linear transformation module, and motor control module, which performs linear transformation and independent decoupling control over 6k±1 harmonic currents to adjust output voltage and achieve decoupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional PI control is used for harmonic current, then the control system is simple, but control accuracy and response speed are insufficient due to bandwidth limitation
Solution Approach 1:
The patent segments the harmonic current control into multiple independent parallel control loops, each targeting a specific harmonic order (5th, 7th, 11th, 13th, etc.). Each loop includes its own detection, transformation, decoupling control, and inverse transformation modules, enabling independent optimization of control accuracy for each harmonic component while maintaining overall system manageability
Solution Approach 2:
The patent introduces dynamic decoupling control that adapts to the dynamic coupling characteristics of harmonic currents in salient pole synchronous motors. The control system dynamically adjusts the decoupling parameters based on the motor's operating state, enabling high-bandwidth response for harmonic current suppression while maintaining system stability
2Difficulty of detecting and measuring
If multiple reference frame transformation is used for harmonic current detection, then detection capability is improved, but control accuracy is reduced due to dynamic coupling between harmonic currents
Solution Approach 1:
The patent introduces a decoupling control module as an intermediary between the multiple reference frame transformation and the control output. This intermediary dynamically compensates for the coupling effects between different harmonic currents, transforming the coupled harmonic current components into independent control variables that can be precisely controlled without interference
Solution Approach 2:
The patent changes the control parameters by introducing decoupling terms that account for the dynamic coupling between harmonic currents. The control equations are modified to include compensation terms that eliminate the interaction between different harmonic components, enabling independent and precise control of each harmonic order
3Measurement precision
If dynamic decoupling control is implemented for each harmonic current, then control accuracy and response speed are improved, but device complexity increases
Solution Approach 1:
The patent implements a universal control framework that handles all harmonic orders through a standardized set of modules. The same detection, transformation, decoupling control, and inverse transformation modules are reused for each harmonic order, reducing overall system complexity despite the multi-loop structure. The control algorithm universally applies to any harmonic order present in the system
Solution Approach 2:
The patent segments the complex decoupling control into modular functional blocks that can be independently implemented and optimized. Each harmonic order has its own dedicated control loop with standardized modules, allowing the system to achieve high control accuracy through parallel independent loops while managing complexity through modular architecture
Data Source
AI summary
A decoupling control system for a salient pole synchronous motor that includes a harmonic current detection module, configured to acquire 6k±1 harmonic current feedback; a linear transformation module, configured to perform linear transformation on 6k±1 harmonic current references and 6k±1 harmonic current feedback in a harmonic reference frame separately to acquire new harmonic currents; and a harmonic current decoupling control module, configured to make adjustment according to an error between a harmonic current reference subjected to the linear transformation and harmonic current feedback subjected to the linear transformation, and perform independent decoupling control over each of the harmonic currents.