Power Converter Control Device Simplified Circuit Configuration
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Solution Overview
Problem
Existing control devices for power conversion systems have complex circuit configurations due to the need for power interruption compensation, which complicates the design and increases size, especially in high-phase systems like twelve-phase power conversion devices.
Innovation Solution
A control device with a simplified circuit configuration using multiple switching circuits and control circuits for each phase, incorporating power interruption compensation and bypass pair operations to ensure safe protective stops without relying on gate shift operations, allowing for shorter power interruption compensation times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power interruption compensation circuits are provided for each phase of a twelve-phase power conversion device, then the gate pulse generation ability is maintained during power interruptions, but the circuit configuration becomes complex and the control device size increases
Solution Approach 1:
The patent merges the power interruption compensation function from individual phase control circuits into a single centralized compensation circuit. This centralized circuit receives power interruption signals from any phase and activates a common bypass pair command, eliminating the need for separate compensation circuits in each of the twelve phases while maintaining the same protective function.
Solution Approach 2:
The invention creates a universal power interruption compensation mechanism that serves all twelve phases through a single circuit design. The bypass pair command generated by the centralized compensation circuit can be applied to any phase experiencing power interruption, making the compensation function multi-phase applicable rather than phase-specific.
2Reliability
If gate shift operation is used for protective stop, then the power conversion device can be stopped safely, but the power interruption compensation period must be extended to 40-100 ms
Solution Approach 1:
Instead of using gate shift (GS) to achieve protective stop, the patent inverts the approach by using bypass pair (BPP) operation. BPP causes high-voltage-side arms and low-voltage-side arms of converter arms connected to the same phase to conduct simultaneously, providing an alternative protective stop mechanism that does not require extended power interruption compensation time.
Solution Approach 2:
The patent changes the operational parameter from gate shift phase angle modification to bypass pair simultaneous conduction. This parameter change allows the protective stop to be achieved without the time-consuming gate shift process, reducing the required power interruption compensation period from 40-100 ms to a much shorter duration.
Data Source
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AI summary
According to an embodiment of the invention, a control device of a power converter is provided. The device includes a first and second switching circuits. The device converts AC power supplied from an AC power supply into DC power, and supplies the DC power to the DC circuit. First converter arms are connected in series in the first switching circuit. Second converter arms are connected in series in the second switching circuit. The device includes a first control circuit and a second control circuit. The first and the second control circuits are connected to the first and the second switching circuits and control gate pulses of each of the first and the second arms respectively. A first and a second power interruption compensation circuits supply power to the first and the second control circuits for prescribed durations in power interruptions of the first and the second control circuits respectively.