Uninterruptible Power Apparatus Forced Disconnection Path
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Solution Overview
Problem
Conventional uninterruptible power apparatuses face instability issues due to thyristor switching failures during grid faults, particularly phase shifts, leading to delayed disconnection of the bypass path, which compromises the stability of the power supply.
Innovation Solution
An uninterruptible power apparatus with a forced disconnection path function, incorporating a bypass path with anti-parallel thyristors, a current detection unit, and a control module that generates a reverse-biased voltage to quickly turn off the thyristors when the grid voltage is abnormal, ensuring stable disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thyristor switching is used in the bypass path, then the structure is simple, but the disconnection speed is slow and stability is poor during grid faults
Solution Approach 1:
The patent introduces a control module as an intermediary between the grid voltage and the thyristor switching system. This control module detects grid voltage abnormalities and generates appropriate control signals to force the thyristors to turn off, acting as a mediator that enables reliable disconnection without requiring complex modifications to the thyristor structure itself.
Solution Approach 2:
The control module utilizes the existing power conversion module to generate the reverse-biased voltage needed for forced thyristor turn-off. By leveraging resources already present in the system, the patent achieves forced disconnection functionality without adding significant external components or increasing overall system complexity.
2Speed
If additional circuit components are added to achieve forced disconnection, then the disconnection speed improves, but the device complexity increases
Solution Approach 1:
The control module performs multiple functions: it detects grid voltage abnormalities, determines the required polarity for forced thyristor turn-off, and controls the power conversion module to generate the necessary reverse-biased voltage. By consolidating these functions into a single control module, the patent achieves fast disconnection without proportionally increasing component count.
Solution Approach 2:
The power conversion module, which already exists in the uninterruptible power apparatus, is utilized to generate the reverse-biased voltage for forced thyristor turn-off. This self-service approach allows the system to achieve fast disconnection speeds by leveraging existing components rather than adding dedicated forced-commutation circuits.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively ensures rapid and stable disconnection of the bypass path during grid faults, maintaining power supply stability without additional circuit components, thus enhancing the reliability of the uninterruptible power apparatus.
Implementation Method 1
The main purpose and effect of the present disclosure is that the uninterruptible power apparatus of the present disclosure uses the control module to control the power conversion module to provide the reverse-biased voltage to the thyristor that has not been turned off when the voltage provided by the grid is abnormal. The reverse-biased voltage can be used to reversely bias the thyristor that has not turned off to ensure that the bypass path is successfully disconnected when the abnormal cycle occurs.
Data Source
AI summary
An uninterruptible power apparatus with a function of forced disconnection path is coupled between a grid and a load, and the uninterruptible power apparatus includes a bypass path, a power conversion module, a current detection unit, and a control module. The bypass path includes a switch unit, and the power conversion module is connected in parallel to the bypass path. The current detection unit detects a current flowing through the bypass path and transmits a current signal to the control module. The control module provides a turned-off signal to the switch unit when a first voltage of the grid is abnormal, and transmits a polarity of the current signal. The power conversion module generates a compensation amount according to the polarity, and generates an output voltage command according to the compensation amount and a voltage at an input terminal or an output terminal of the power conversion module.