UPS Device Detecting Voltage Rise and Harmonics
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Solution Overview
Problem
Existing continuous commercial power supply type uninterruptable power supply devices only compensate for instantaneous voltage drop and frequency fluctuation, failing to address other system abnormalities such as voltage rise, phase fluctuation, voltage imbalance, harmonic abnormalities, and flicker, which are not considered for both the load and the storage battery.
Innovation Solution
An uninterruptable power supply device is designed with a power supply unit, an open switch, a system abnormality detection unit, and a control unit that detects and responds to voltage rise, phase fluctuation, voltage imbalance, harmonic abnormalities, and flicker, in addition to frequency fluctuation and voltage drop, by opening the open switch when detected abnormalities exceed the tolerance of the essential load or power supply unit, ensuring comprehensive system abnormality compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the uninterruptable power supply device only compensates for instantaneous voltage drop and frequency fluctuation, then the device complexity is reduced, but the adaptability to various system abnormalities deteriorates
Solution Approach 1:
The system abnormality detection unit is designed to detect multiple types of system abnormalities including voltage rise, phase fluctuation, voltage imbalance, harmonic abnormality, and flicker in addition to frequency fluctuation and voltage drop. This multi-functional detection capability allows the device to adapt to various system abnormalities without requiring separate dedicated devices for each abnormality type, thus achieving universality while maintaining reasonable device complexity
2Device complexity
If the system abnormality detection unit detects only frequency fluctuation and voltage drop, then the measurement precision for other abnormalities is insufficient, but the device complexity is reduced
Solution Approach 1:
The system abnormality detection unit is segmented into multiple specialized detection functions, each responsible for detecting specific types of abnormalities (voltage rise detection, phase fluctuation detection, voltage imbalance detection, harmonic abnormality detection, flicker detection, frequency fluctuation detection, and voltage drop detection). This segmentation allows each detection function to be optimized for its specific measurement task, achieving high measurement precision for various system abnormalities while keeping the overall device complexity manageable through modular design
3Ease of operation
If the open switch is opened only based on load tolerance, then the reliability of the power supply unit is reduced, but the ease of operation is improved
Solution Approach 1:
The control unit opens the open switch based on feedback from the system abnormality detection unit by comparing detected abnormalities against both load tolerance and power supply unit tolerance thresholds. This feedback mechanism ensures that the switch is opened not only when load tolerance is exceeded but also when power supply unit tolerance is exceeded, maintaining high reliability of the power supply unit while keeping the control operation simple through automated threshold-based decision making
Data Source
AI summary
Provided is an uninterruptable power supply device. An uninterruptable power supply device 100, which is provided between a commercial power system 10 and an essential load 30 and which provides AC power to the essential load 30, wherein the uninterruptable power supply device 100 is provided with: a power supply unit 2, which has a power converter 22 and a storage battery 21 and which is connected to a power line L1; an open switch 3 for opening the power supply line L1; a system abnormality detection unit 5 for detecting a system abnormality, which is at least one of voltage rise, phase fluctuation, voltage imbalance, harmonic abnormality, and flicker, in addition to at least one of frequency fluctuation and voltage drop including instantaneous voltage drop; and a control unit 6 which, opens the open switch 3 and supplies AC power to the essential load 30.