Dual-Inverter Rotating Machine Voltage Balancing Control
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Solution Overview
Problem
Conventional rotating machine control devices experience mismatch between systems when the difference occurs between DC voltages output from DC power supplies of multiple systems controlling the rotating machine.
Innovation Solution
A rotating machine control device comprising a first inverter and a second inverter, each applying AC voltage to three-phase windings of a respective system, and controllers that generate command values for the inverters based on the command value of the rotating machine, the first DC voltage, and the second DC voltage. The controllers limit the system voltage command using the DC voltage of the other system and normalize the voltage command by using the DC voltage of the own system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent arithmetic operation and electric current control are conducted in each system, then control flexibility is improved, but mismatch between systems occurs
Solution Approach 1:
The master controller transmits command values to the slave controller, creating a feedback mechanism that ensures both systems operate with consistent control parameters. This feedback loop allows independent control while maintaining system consistency by continuously synchronizing control decisions between the two systems.
Solution Approach 2:
The patent combines the control functions of two independent systems into a coordinated master-slave architecture. The master controller and slave controller work together as a unified control system, merging their operational decision-making processes to eliminate mismatch while preserving the benefits of dual-system control flexibility.
2Adaptability or versatility
If DC voltages from different DC power supplies are used by inverters, then system independence is improved, but voltage difference causes mismatch between systems
Solution Approach 1:
The controllers adjust control parameters based on the detected DC voltage levels of each power supply. By dynamically changing control parameters to account for voltage differences, the system maintains accurate control despite using independent DC power supplies with different output voltages, thereby preventing mismatch between systems.
Solution Approach 2:
The system performs preliminary detection of DC voltage levels from each power supply before executing control operations. This preliminary action allows the controllers to pre-adjust their control strategies based on known voltage differences, preventing mismatch from occurring in the first place rather than correcting it afterward.
Data Source
AI summary
A rotating machine control device comprises: a first inverter that applies an alternating-current voltage to three-phase windings of a first system included in a rotating machine, based on a first direct-current voltage that has been output from a direct-current power supply of the first system; a second inverter that applies an alternating-current voltage to three-phase windings of a second system included in the rotating machine, based on a second direct-current voltage that has been output from a direct-current power supply of the second system; a first controller; and a second controller, in that the first controller and the second controller each limit an own system voltage command related to a voltage to be applied to the three-phase windings of an own system by use of a direct-current voltage of an other system, in a case where a direct-current voltage of the own system is higher than the direct-current voltage of the other system, and also generate a value obtained by normalizing the own system voltage command by use of the direct-current voltage of the own system, as a command value to an inverter of the own system.