Hybrid UPS Thyristor Bypass for Low-Loss Power Continuity
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Solution Overview
Problem
Uninterruptible power supplies experience power loss due to continuous power conversion by converters and inverters, and voltage drop protectors can cause temporary power outages during abnormal conditions.
Innovation Solution
A hybrid uninterruptible power supply system that includes a power conversion unit, an inverter, a power storage unit, a current thrupass unit with thyristors, and a controller to manage power distribution, allowing efficient power supply through thyristors during normal operations and switching to alternative power sources during interruptions or abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If continuous power conversion by converter and inverter is used to supply power, then power can be supplied to loads, but power loss occurs
Solution Approach 1:
The power supply system is segmented into multiple paths: a main power supply path using converter and inverter for normal operation, and a bypass path using thyristors for high-efficiency operation. This segmentation allows the system to switch between different power transmission modes, using the bypass path to reduce power losses when conditions permit.
Solution Approach 2:
The system dynamically switches between converter-inverter based power supply and thyristor-based bypass power supply based on real-time grid conditions and load requirements. The controller adjusts the operating mode to optimize efficiency while maintaining reliable power supply, reducing power losses during normal conditions while ensuring stability during transitions.
2Reliability
If voltage drop protection device operates during abnormality, then facility is protected, but temporary stoppage of power supply occurs
Solution Approach 1:
The bypass path with thyristors is pre-configured and ready before abnormalities occur. When voltage drops or power interruptions are detected, the system immediately activates the bypass path to maintain power supply continuity, avoiding the temporary stoppage that would otherwise occur during protection operations.
Solution Approach 2:
The bypass path acts as an intermediary power transmission channel that activates during abnormal conditions. When the main power supply path becomes unstable or requires protection operations, the bypass path mediates by providing alternative power transmission through thyristors, ensuring continuous power supply to critical loads.
3Adaptability or versatility
If converter and inverter are used for power conversion, then power supply flexibility is achieved, but power loss increases
Solution Approach 1:
The system periodically evaluates grid conditions and switches between converter-inverter operation and bypass operation. During periods when grid conditions are favorable, the bypass path is activated to reduce power losses. During periods requiring flexible power conversion, the converter-inverter system operates, optimizing the balance between adaptability and efficiency.
4Loss of energy
If bypass path with thyristors is used, then power loss is reduced, but system complexity increases
Solution Approach 1:
The bypass path with thyristors is merged with the existing converter-inverter system, sharing common components such as the controller, power storage unit, and connection points. This merging approach reduces the overall system complexity compared to a completely separate bypass system, while still achieving significant power loss reduction.
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 system provides high-efficiency power supply with reduced losses and increased reliability by utilizing thyristors for direct power transmission and rapid switching to backup power sources, maintaining stable power to critical loads.
Implementation Method 1
a current thrupass unit electrically connected to the first external AC power source and electrically connected to the load and including a first thyristor
Implementation Method 2
a power storage unit electrically connected between the converter and the inverter
Implementation Method 3
a power conversion unit including a converter electrically connected to a first external alternating current (AC) power source
Implementation Method 4
an inverter electrically connected to an output of the converter and to a load
Data Source
AI summary
A hybrid uninterruptible power supply includes a power conversion unit including a converter electrically connected to a first external alternating current (AC) power source, an inverter electrically connected to an output of the converter and to a load, and a power storage unit electrically connected between the converter and the inverter, a current thrupass unit electrically connected to the first external AC power source and electrically connected to the load and including a first thyristor, a current bypass unit including a second thyristor and a switch electrically connected in parallel to the second thyristor, the second thyristor being electrically connected to a second external AC power source and electrically connected to the load, and a controller configured to control the power conversion unit, the current thrupass unit, and the current bypass unit.