UPS Energy Storage Control via PLC and Converter Status
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Solution Overview
Problem
The complexity of communication between components in uninterruptible power supply (UPS) systems leads to increased interference and error probability, slowing down operation and reducing system stability, especially during accident events.
Innovation Solution
An uninterruptible power supply system with a programmable logic controller (PLC) that determines the operating mode of the energy storage system based on the operating states of converters, allowing the system to actively switch to UPS mode and simplify command-control relationships, thereby reducing communication complexity and improving response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PLC communicates with each component to control operations, then the system can be controlled stably, but the communication complexity increases and response speed slows down
Solution Approach 1:
The system divides control functions into two segments: the PLC handles high-level decision-making and mode determination, while the energy storage system's own controller handles real-time operational control. This segmentation reduces the communication burden on the PLC while maintaining system stability through distributed control.
Solution Approach 2:
The energy storage system's controller acts as an intermediary between the PLC and the power conversion components. It receives mode commands from the PLC and autonomously manages the detailed control operations, reducing direct communication requirements between the PLC and multiple components.
2Adaptability or versatility
If the PLC communicates with each component, then comprehensive control is achieved, but the number of communication connections increases and error probability rises
Solution Approach 1:
The detailed control functions are extracted from the PLC and transferred to the energy storage system's dedicated controller. This reduces the number of communication connections required for the PLC while maintaining comprehensive control capabilities through the localized controller's autonomous operation.
3Extent of automation
If the energy storage system waits for PLC commands to operate, then centralized control is maintained, but response speed during accidents is reduced
Solution Approach 1:
The energy storage system's controller is pre-configured with control algorithms and decision-making capabilities. When the PLC determines an accident condition and issues a mode change command, the system can immediately execute the appropriate response without waiting for detailed operational commands, achieving both centralized oversight and rapid response.
Solution Approach 2:
The control architecture dynamically adjusts the level of autonomy based on operating conditions. During normal operation, the PLC maintains centralized control for mode determination. During accident events, the energy storage controller autonomously executes rapid response actions while still operating within the PLC-determined mode framework.
Data Source
AI summary
Disclosed is an uninterruptible power supply system comprising an energy storage system (ESS). The uninterruptible power supply system comprises an ESS and is connected to a grid, and further comprises: a first converter for converting an alternating current voltage of the grid into a direct current voltage; a second converter connected in series to the first converter, for converting the direct current voltage outputted from the first converter into an alternating current voltage and transferring same to a load; the ESS comprising a battery connected to a node between the first and second converter, for performing charging and discharging; and a PLC for receiving the operation statuses of the first and second converters, and on the basis thereof, controlling the operation of the uninterruptible power supply system, wherein the PLC determines the operation mode of the ESS by using the received operation statuses of the first and second converters.