CN204376531U - The remote and intelligent maintenance system of transforming plant DC power supply - Google Patents

Abstract

This application relates to a remote intelligent maintenance system for substation DC power supply, including a DC power supply, the input terminal of the DC power supply is connected to the AC power distribution terminal, the output terminal of the DC power supply is connected to the DC power distribution terminal, and the DC power supply includes charging and discharging Module 1-n, charging and discharging module 1-n are respectively connected with battery pack 1-n, battery pack 1-n is connected with battery monitoring module 1-n, said battery monitoring module includes voltage monitoring module, circuit monitoring module and internal resistance testing module, the battery monitoring module is connected to a monitoring module, and the monitoring module is connected to a control terminal. The control terminal performs long-distance communication with the centralized monitoring module of the DC system of each branch station. After receiving the monitoring command issued by the control terminal, the monitoring module of the DC system of each branch station completes the data collection and control operation of the DC system, and sends the result back to the remote control terminal, so as to realize the unattended and real-time centralized monitoring and control of the DC equipment. remote maintenance.

Description

Remote Intelligent Maintenance System for Substation DC Power Supply

technical field

This application relates to a remote intelligent maintenance system for DC power supplies in substations.

Background technique

In the power system, in order to provide power for control, protection, automatic devices, emergency lighting and various DC equipment, there must be a reliable DC power supply. Therefore, the power plant and the substation are equipped with independent DC power battery packs and matching charging and floating charging devices, referred to as DC power systems. Its function is to provide and gate DC power for the circuit breaker in the substation under normal conditions. In the event of failure, when the power supply of the factory and station is interrupted, it provides DC power for relay protection and automatic devices, circuit breakers and gates and trips, carrier communication, and factory machinery driven by DC motors in power plants. Therefore, the DC power system of the substation is the basic guarantee for relay protection, automatic devices and circuit breakers to start correctly, and its stable operation is very important to prevent system damage, accident expansion and serious damage to equipment.

In the past, all substations in the power system were manned to regularly check the operation status of DC equipment, detect and deal with abnormal phenomena in time, and ensure the safe and stable operation of substations. At present, the power system promotes unattended substations. Although the dispatching center can obtain real-time information on the operation of the substation through the telecontrol channel, it can only obtain a small amount of important information for the DC part, which cannot reflect the detailed information of the DC system operation. Equipment maintenance personnel are needed. Check it regularly. In addition, the control of DC equipment operation is also performed on-site by maintenance personnel.

The revolution of electronic technology, computer technology, network technology, and design thinking has gradually made the realization of digital and unattended substations a reality. At present, various electrical equipment in the power system have gradually realized remote monitoring, but there is no perfect implementation plan and technical means for the remote online monitoring of the DC power supply system and the monitoring system itself, which will directly affect the overall automation level.

In view of the fact that the power system has a wide jurisdiction, many substations, few maintenance personnel, long distances, and difficult maintenance, it is basically impossible to ensure that the regular inspection and maintenance of DC equipment and its batteries are completed on schedule. Safety and reliability come with safety concerns.

Contents of the invention

The purpose of this application is to propose a remote intelligent maintenance system for substation DC power supply that can monitor battery packs online and remotely charge and discharge the battery packs.

The purpose of this application is achieved in this way: the remote intelligent maintenance system of the substation DC power supply includes a DC power supply, the input terminal of the DC power supply is connected to the AC power distribution terminal, the output terminal of the DC power supply is connected to the DC power distribution terminal, and the DC power supply includes Charging and discharging modules 1-n, the charging and discharging modules 1-n are respectively connected with the battery pack 1-n, and the battery pack 1-n is connected with a battery monitoring module 1-n, and the battery monitoring module includes a voltage monitoring module, a circuit monitoring module and an internal resistance testing module, the battery monitoring module is followed by a monitoring module, and the monitoring module is networked with the public switched telephone network PSTN through a modem and connected with a control terminal.

Due to the implementation of the above technical solution, the control terminal communicates with the centralized monitoring module of the direct current system of each branch station through a dedicated line or a public telephone network for long-distance communication. After receiving the monitoring command issued by the control terminal, the monitoring module of the DC system of each branch station completes the data collection and control operation of the DC system, and sends the result back to the remote control terminal, so as to realize the unattended and real-time centralized monitoring and control of the DC equipment. remote maintenance.

This application installs the measurement and control terminal in the substation, which can automatically activate and balance the battery pack online, and evaluate, analyze and diagnose the capacity and state of the battery according to the established mathematical model, and automatically calculate the characteristic parameters of the charging module, including battery The capacity, internal resistance, battery voltage, charge and discharge current.

Description of drawings

Concrete structure of the application is provided by following accompanying drawing and embodiment:

Figure 1 is a schematic diagram of a remote intelligent maintenance system for DC power supplies in substations;

Figure 2 is a control schematic diagram of the charge and discharge module;

Figure 3 is a schematic diagram of the monitoring module.

Detailed ways

The present application is not limited by the following examples, and specific implementation manners can be determined according to the technical solutions of the present application and actual conditions.

Embodiment: As shown in Figure 1, the remote intelligent maintenance system of the substation DC power supply includes a DC power supply, the input terminal of the DC power supply is connected to the AC distribution terminal, the output terminal of the DC power supply is connected to the DC distribution terminal, and the DC power supply includes Charging and discharging modules 1-n, the charging and discharging modules 1-n are respectively connected with the battery pack 1-n, and the battery pack 1-n is connected with a battery monitoring module 1-n, and the battery monitoring module includes a voltage monitoring module, a circuit monitoring module and an internal resistance testing module, the battery monitoring module is followed by a monitoring module, and the monitoring module is networked with the public switched telephone network PSTN through a modem and connected with a control terminal.

The AC power distribution terminal is connected to the DC power distribution terminal through a DC bus, and the DC bus includes a closing bus and a control bus. voltage device.

As shown in Figure 2, the battery charging control system is composed of a single-chip computer system and a computer system. The single-chip computer system collects, displays and controls the circuit parameters of the battery pack charging circuit, such as current and voltage, to realize the control of the battery charging circuit. On-site control: The computer system sets the battery charging voltage, current and other parameters through the designed monitoring software, and communicates with the on-site single-chip computer system through the RS485 standard bus. When the single-chip microcomputer system obtains the command and parameter information sent by the computer system, the single-chip microcomputer system completes the control of the charging circuit of the battery pack, and realizes the remote monitoring of the system.

As shown in Figure 3, the monitoring module includes a single-chip microcomputer, and the single-chip microcomputer is connected with the A/D conversion module. After the A/D conversion module, a multi-way switch, a signal conditioning module, a photoelectric isolation module and an analog signal input module are sequentially connected. An RS485 interface is provided on the single-chip microcomputer, and a keyboard and a display device are connected. The hardware of the monitoring module is based on the single-chip microcomputer, which mainly completes the collection and processing of various data, the realization of calculation algorithms, the management of setting values, real-time clock control, panel man-machine interface, serial and parallel interface control, switch input and electronic switch control management. and control functions.

When the AC power distribution terminal has power, the three-phase power will output DC power through the charging module and directly supply it to the user. At the same time, the battery monitoring module monitors the discharge current value of the battery cell, the terminal voltage of the battery cell and the reserved capacity, and charges the battery according to the battery capacity according to the corresponding battery pack charging curve, so as to ensure that the battery is fully charged. capacity status. Once the AC power is lost, the discharge circuit of the battery pack is opened, and the backup power function of the DC power system can be put into use immediately to supply power to the user, thereby avoiding the damage caused by the AC power loss to the user and reducing the loss.

The above technical features constitute the best embodiment of this application, which has strong adaptability and best implementation effect, and non-essential technical features can be added or subtracted according to actual needs to meet the needs of different situations.

Claims (5)

1. A remote intelligent maintenance system for substation DC power supply, characterized in that: it includes a DC power supply, the DC power supply input terminal is connected with the AC power distribution terminal, the DC power supply output terminal is connected with the DC power distribution terminal, and the DC power supply Including charging and discharging modules 1-n, the charging and discharging modules 1-n are respectively connected with the battery pack 1-n, and the battery pack 1-n is connected with a battery monitoring module 1-n, and the battery monitoring module includes a voltage monitoring module, a circuit A monitoring module and an internal resistance testing module, the battery monitoring module is followed by a monitoring module, and the monitoring module is networked with the public switched telephone network through a modem and connected with a control terminal. 2. The remote intelligent maintenance system of substation DC power supply as claimed in claim 1, characterized in that: the AC power distribution terminal and the DC power distribution terminal are connected through a DC bus, and the DC bus includes a closing bus and a control bus , A step-down device is set between the closing busbar and the control busbar. 3. The remote intelligent maintenance system of substation DC power supply as claimed in claim 1, characterized in that: the storage battery charging control system is composed of a single-chip microcomputer system and a computer system, wherein the single-chip microcomputer system collects the circuit parameters of the battery pack charging circuit, Display and control to realize on-site control of the battery charging circuit; the computer system communicates with the on-site single-chip microcomputer system through the RS485 standard bus. 4. The remote intelligent maintenance system of substation DC power supply as claimed in claim 1, characterized in that: the monitoring module includes a single-chip microcomputer, and the single-chip microcomputer is connected with the A/D conversion module, and after the A/D conversion module, the multi-way switch, signal Conditioning module, photoelectric isolation module and analog signal input module. 5. The remote intelligent maintenance system of substation DC power supply according to claim 1, characterized in that: the single-chip microcomputer is provided with an RS485 interface, and is connected with a keyboard and a display device.