UPS Open-Switch Control for Multi-Fault Grid Abnormalities
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Solution Overview
Problem
Conventional uninterruptible power supply devices of the continuous commercial power supply type only compensate for instantaneous voltage drops and frequency fluctuations, failing to address other system abnormalities such as voltage rises, phase fluctuations, voltage imbalances, harmonic abnormalities, and flickers, and do not consider the energy storage device's tolerance in their operations.
Innovation Solution
An uninterruptible power supply device equipped with a power supply part, an open switch, a system abnormality detection part, and a control part that detects and responds to various system abnormalities by opening the open switch when the detected anomaly exceeds the tolerance of the essential load or the power supply part, including considerations for voltage rises, phase fluctuations, voltage imbalances, harmonic abnormalities, and flickers, using complex number representation for three-phase systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the conventional uninterruptible power supply device only compensates for instantaneous voltage drops and frequency fluctuations, then the device complexity is reduced, but the adaptability to various system abnormalities deteriorates
Solution Approach 1:
The system abnormality detection part is designed to detect multiple types of system abnormalities including voltage drops, voltage rises, phase fluctuations, voltage imbalances, harmonic abnormalities, and flickers. This multi-functional detection capability allows a single device to handle various abnormal conditions without requiring separate detection systems for each abnormality type, thus improving adaptability while controlling complexity.
2Device complexity
If the system abnormality detection part detects only voltage drops and frequency fluctuations, then the measurement precision for other abnormalities is insufficient, but the device complexity is reduced
Solution Approach 1:
The system abnormality detection part integrates multiple detection functions into a single system that can simultaneously detect voltage drops, voltage rises, phase fluctuations, voltage imbalances, harmonic abnormalities, and flickers. This universal detection approach ensures comprehensive measurement precision for all abnormality types without requiring separate specialized detection devices for each abnormality.
Solution Approach 2:
The patent employs electrical and electronic detection methods rather than mechanical systems to detect various system abnormalities. The system abnormality detection part uses electrical signal analysis to identify different types of abnormalities, replacing what would otherwise require multiple separate mechanical or specialized electrical detection devices.
3Reliability
If the open switch is opened only for voltage drops, then the reliability for protecting against other system abnormalities deteriorates, but the loss of time for switching operations is reduced
Solution Approach 1:
The system abnormality detection part continuously monitors the commercial power system for various abnormalities including voltage drops, voltage rises, phase fluctuations, voltage imbalances, harmonic abnormalities, and flickers. By detecting abnormalities in advance and triggering the open switch before damage occurs, the system provides comprehensive protection without requiring delayed responses, thus maintaining both high reliability and minimal time loss.
Solution Approach 2:
The control part receives detection results from the system abnormality detection part and automatically controls the open switch based on the detected abnormality type and severity. This feedback mechanism ensures that the open switch is opened promptly and appropriately for any detected system abnormality, maintaining high protection reliability while minimizing unnecessary switching operations and associated time losses.
Data Source
AI summary
An uninterruptible power supply device provided between a commercial power system and an essential load and supplying AC power to the essential load includes: a power supply part that has an energy storage device and is connected to a power line for supplying power from the commercial power system to the essential load; an open switch for opening/closing the power supply line, the open switch being provided on the power line on the commercial-power-system side of the power supply part; a system abnormality detection part for detecting a system abnormality occurring on the commercial-power-system side of the open switch; and a control part that, when the detected system abnormality is equal to or greater than the tolerance of the essential load or the power supply part against system abnormalities, opens the open switch and supplies AC power from the power supply part to the essential load.