Overview:
The UPS power supply system is an essential power source for the power, communications, banking and other industries. The UPS intelligent monitoring system designed in this paper has the following links and functions: it can operate in various complicated grid environments; it will not generate additional interference to the mains during operation; the output electrical performance indicators should be comprehensive and high quality. , can meet the requirements of the load.
introduction
UPS power supply system is an essential power source for power, communication, banking and other industries. It has been developing for decades, and its protection function is constantly changing in the process of continuous development and improvement of technology. The UPS can be divided into: backup, online and online interactive according to the working state of the inverter in the host. Their role is to filter and regulate the mains to provide a more stable voltage to the load. At the same time, the electric energy is converted into chemical energy by the charger and stored in the battery. Once the power is interrupted, the grid voltage or the grid frequency exceeds The input range of the UPS can turn on its own reserve power supply and supply power to the load in a very short time.
The UPS intelligent monitoring system designed in this paper has the following links and functions: it can operate in various complicated grid environments; it will not generate additional interference to the mains during operation; the output electrical performance indicators should be comprehensive and high quality. It can meet the requirements of the load; the UPS itself should have high efficiency and output capacity close to the actual mains; it is a highly intelligent device with a highly intelligent self-checking function, automatic display, Alarm, status memory function and communication function.
1 overall design
The design consists of a main monitoring unit, an AC detection unit, a battery detection and inspection unit, a feeder detection and voltage regulation unit, an insulation monitoring and a ground selection unit. These modules communicate with each other through internal RS485 to realize real-time monitoring, control and alarm processing of AC power distribution, battery charge and discharge process, battery status, voltage regulation status, bus-to-ground resistance, and feeder line switch status. The entire system communicates with the host computer through RS232 for historical data query and statistics.
2 Introduction of each unit
2.1 Main monitoring unit
The main monitoring unit schedules the operation of the entire system. The main monitoring unit consists of main monitoring board, 320x240 dot matrix liquid crystal display, keyboard and indicator light, etc., complete battery charge and discharge management, operation and control parameter setting and display, alarm record storage, query, through RS232 and host computer Communication, control of internal units through RS485. 
2.2 AC detection unit
The unit mainly completes the acquisition of three-phase AC voltage, current and frequency; at the same time, it has the alarm functions of AC power loss, phase loss, over voltage and under voltage; when the alarm is on, the relay alarm contact is closed. The three-phase AC voltage display value can be corrected by adjusting the potentiometer on the board.
2.3 Battery detection and inspection unit
The unit consists of a battery detection board and a battery inspection board (optional), which mainly completes the collection of the battery voltage (the mother voltage), the charge/discharge current, the ambient temperature and the cell voltage; the battery fuse state detection; By outputting analog voltage and current reference to control the voltage or current of other manufacturers' modules or phase-controlled power supply three-phase trigger board (consider with the manufacturer), improve system compatibility; measure on time; Over-voltage, battery over-charge, battery feed and single battery failure alarm; adjust the battery voltage and cell voltage display value by adjusting the potentiometer on the battery test board and the battery patrol board. As shown in Figure 2. 
2.4 Feeder detection and silicon chain regulator unit
The feeder line detects the CPU board and the switch input board, and detects the state of the feeder switch of the mother and the master in real time. Through the switch expansion port, 24 feeders can be detected. When the switch is changed or the voltage of the master is exceeded, the alarm is automatically adjusted and the voltage is controlled by the silicon chain (up to 7 silicon chains). The control voltage display value can be adjusted by adjusting the potentiometer on the feeder detection board.
2.5 Insulation Monitoring and Grounding Line Selection Unit
It consists of insulation monitoring board and grounding line expansion board. The main function is to monitor the bus-to-ground resistance and self-positioning grounding branch in real time. When the busbar ground resistance is lower than the alarm set value, the alarm relay is closed; the ground selection line is connected through the ground selection expansion port, and up to 24 line selection lines are supported.
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Shenzhen Longxc Power Supply Co., Ltd , https://www.longxcpower.com