AC Motor Inverter Control for Multi-Phase Open-Circuit Faults
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Solution Overview
Problem
Current fault-tolerant control strategies for open-circuit faults in alternating current motors and inverters are limited to single-phase faults and lack a pure software solution for multi-phase faults, leading to reduced reliability and safety, especially in single-motor-drive vehicles where hardware modifications are costly and complex.
Innovation Solution
A fault-tolerant control method that determines rotor fault position intervals and establishes a control constraint model with open-circuit fault equations for each phase, allowing for phase current reference value determination using a fault-tolerant control algorithm, applicable to 1 to M phases, thereby addressing multi-phase open-circuit faults without hardware changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an auxiliary circuit is added to implement fault-tolerant control, then the fault-tolerant capability is improved, but the system cost and complexity increase
Solution Approach 1:
The patent replaces the traditional hardware-based auxiliary circuit approach with a software-based control method. By using a fault-tolerant control algorithm that processes fault information and determines rotor fault position intervals through software computation, the system achieves fault-tolerant capability without adding physical auxiliary circuits, thereby reducing system complexity and cost while maintaining reliability
Solution Approach 2:
The patent changes the control parameters and control strategy based on detected fault conditions. By monitoring fault information and determining rotor fault position intervals, the system dynamically adjusts control parameters to maintain stable operation under fault conditions, achieving fault tolerance through parameter adaptation rather than hardware modification
2Ease of manufacture
If existing fault-tolerant control strategies for single-phase faults are applied, then the control method is simple, but the applicability to multi-phase faults is limited
Solution Approach 1:
The patent creates a universal fault-tolerant control method that can handle both single-phase and multi-phase open-circuit faults. The control algorithm determines rotor fault position intervals for any fault phase configuration, making the same control approach applicable to various fault scenarios without requiring different control strategies, thereby achieving multi-functionality while maintaining simplicity
Solution Approach 2:
The patent introduces dynamic adaptation by determining rotor fault position intervals based on the specific fault condition detected. The control method dynamically adjusts to different fault phases and configurations, transitioning from static single-phase fault handling to dynamic multi-phase fault coverage, enhancing versatility while keeping the base control structure simple
Data Source
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AI summary
The disclosure relates to the field of motor control, and more specifically, to a fault-tolerant control method and apparatus for an open-circuit fault in an alternating current motor and an inverter thereof, a computer device, and a computer storage medium. The method includes: A: determining, based on fault information of the alternating current motor and the inverter for driving the alternating current motor, a rotor fault position interval corresponding to each fault phase in one or more fault phases; B: establishing a fault-tolerant control constraint model, where the fault-tolerant control constraint model includes an open-circuit fault equation applicable to each fault phase for the corresponding rotor fault position interval; and C: determining, with the fault-tolerant control constraint model as a constraint, a phase current reference value by using a fault-tolerant control algorithm.