CN202978428U - Substation direct current power supply information management system based on three-level network architecture - Google Patents

Abstract

The utility model relates to a substation DC power supply information management system based on a three-level network structure. The system includes the DC power system of the substation, and the battery pack and DC switching power supply of the power system are connected to the network data transmission system through the DC power monitoring terminal and then communicated with the remote monitoring platform. The utility model provides a high-efficiency and convenient detection means for the DC power supply of the substation.

Description

Substation DC power information management system based on three-level network architecture

technical field

The utility model relates to a substation DC power supply information management system based on a three-level network structure.

Background technique

In recent years, the scale of power grid companies has developed rapidly in terms of electricity sales, number of substations, and scale construction. Substation unattended, automated, and intelligent are developing rapidly. However, the automation level of DC system operation and maintenance lags far behind. The DC operation and maintenance teams of the units directly under the North China Power Grid are very short of personnel. They are tired of coping with the inspection of the battery in the substation and the regular check charging and discharging of the battery, and often fail to complete the relevant indicators every year.

The main causes of hidden dangers in the operation of the DC system are:

The remote control technology is not perfect. The technology used on site is mainly based on monitoring and lacks control parts. In particular, the remote control technology with the core of remote charging and discharging of batteries needs to be further improved to effectively ensure safe and reliable operation on site.

Lack of uniform standards. The technical standards of different manufacturers are inconsistent, and the implementation forms are varied; at the same time, there is a lack of corresponding standards for the operation and maintenance of the equipment.

Lack of detection means. DC remote monitoring equipment lacks performance testing basis and methods, and the quality cannot be guaranteed.

Utility model content

According to the deficiencies in the prior art above, the technical problem to be solved by the utility model is: to provide an easy-to-use and effective substation DC power supply information management system based on a three-level network architecture.

The substation DC power supply information management system based on the three-level network architecture provided by the utility model includes the substation DC power supply system, the battery pack and the DC switching power supply of the power supply system are connected to the network data transmission system through the DC power supply monitoring terminal, and then communicate with the remote monitoring platform connect. The network data transmission system is mainly a TCP/IP network data transmission system.

The DC power monitoring terminal contains an internal resistance test unit, a battery state control device, a switch value acquisition module, a voltage acquisition module, a remote control output module, a battery charge and discharge module, an insulation monitoring unit, a switching power supply monitor, an internal resistance test unit, and a voltage acquisition module Module, remote control output module, switching value acquisition module and battery charge and discharge module are connected with the battery pack and communicate with the battery state control device; the switching power supply monitor is connected to the DC switching power supply; the battery state control device, switching power supply monitor, upper information collection terminal communication. Use these units to automatically monitor the battery voltage, battery internal resistance, current, ambient temperature, switch status, charger parameters, and insulation status online. The remote control output module mainly receives external wireless signals so that the battery state control device controls the battery charging and discharging module to perform remote charging and discharging operations.

The internal resistance test unit is a cycle discharge internal resistance test unit.

The chip in the voltage acquisition module solidifies the voltage coefficient, and the voltage acquisition module uses a 5PPM reference source.

The battery charging and discharging module is connected with each bus tie switch, bus incoming switch, charging switch and discharging switch of the battery pack through an electric switch mechanism.

The remote monitoring platform is one of remote PC, network short message server or a combination of these two.

The beneficial effects that the utility model has are:

(1) Realize on-line monitoring of the internal resistance of the battery pack:

The utility model adopts the group direct current large current instantaneous discharge test method to realize the automatic on-line detection of the battery internal resistance. The method of measuring internal resistance by DC instantaneous discharge is to discharge the battery pack to a load instantaneously, and calculate the corresponding internal resistance through the instantaneous voltage drop when the load is turned on and the instantaneous voltage recovery when the load is disconnected. The grouping method is to divide the entire battery group into different test groups, and only test one of the groups at a time, which minimizes the impact of instantaneous discharge on the DC bus voltage.

(2) Establish a battery pack health status model to provide a basis for condition-based maintenance:

The utility model automatically uploads the collected DC power supply information of the substation, and performs data analysis and data storage through a remote monitoring platform. And regularly conduct internal resistance tests on the battery pack, monitor the battery pack voltage, cell voltage, battery room temperature and other parameters in real time, send the data to the monitoring center through the communication network, establish a battery operation database, and the system conducts comprehensive analysis on the data to establish a battery The group health status model realizes the early warning of battery health status, provides a basis for condition-based maintenance, and ensures the safe operation of the DC system.

The system analyzes the operating data of the battery, and integrates the long-term trend of the voltage and internal resistance of the battery. When the data exceeds the set limit, the system proposes a suggestion for battery maintenance or replacement, and converts the regular maintenance of the battery into status maintenance, thereby saving energy. A large amount of manpower and material resources have greatly reduced the workload of DC maintenance personnel.

(3) Establish a safety protection system for remote checking discharge:

The utility model monitors the operating parameters of the battery pack in real time, realizes the conversion of the operation mode of the DC system through the charging and discharging module of the battery pack, realizes the remote checking discharge of the battery pack, and establishes a complete set of safety protection system for the remote checking discharge. First of all, the remote operation of the electric switch mechanism starts in sequence; to ensure the safety of remote discharge of the battery pack.

(4) Establish a DC power remote monitoring system based on Internet of Things technology to realize an integrated monitoring platform for DC systems:

The utility model adopts Internet of Things technology to divide substation monitoring equipment into several intelligent units, including on-site monitoring unit, charger monitoring module, insulation monitoring module, battery voltage monitoring module, internal resistance testing module, remote discharge load module, etc. The field network is connected together to realize the real-time monitoring of the operating parameters of the DC system.

The utility model is based on a three-level network architecture, that is, the integrated monitoring platform of the DC system is realized through the internal LAN, and the DC system monitoring center of the network company is established in the Electric Power Research Institute to monitor the operation status of the DC system of the substation in the network; The DC system monitoring center monitors the DC system of the substation, including DC bus voltage, charger operation data, DC system insulation status, battery pack operation status, etc. The system analyzes the output voltage of the charger to judge the operating status of the charger; analyzes the insulation monitoring data, predicts the insulation status of the DC system according to the change trend of the insulation resistance; and warns the health status of the battery according to the internal resistance and voltage data of the battery cell.

(5) Technical specifications:

The utility model complies with the technical specifications related to the DC remote monitoring system. The specification stipulates the environmental conditions for the use of the DC remote monitoring system, the basic composition of the system, technical requirements, technical parameters, electrical and safety requirements, and inspection rules and inspection methods.

(6) Operation and management norms:

The utility model complies with the operation and management norms of the North China Power Grid Co., Ltd. for the DC remote monitoring system. It stipulates the basic requirements for DC power supply system equipment maintenance involving the operation and maintenance of DC power remote monitoring system, preparation before maintenance, testing items, troubleshooting, maintenance items and quality requirements, test items and requirements, preparation of maintenance reports, acceptance and operation, etc. content.

Description of drawings

Fig. 1 is a block diagram of the utility model;

Detailed ways

Embodiments of the utility model are further described below in conjunction with the accompanying drawings:

The substation DC power information management system based on the three-level network architecture shown in Figure 1 includes the substation DC power system, the battery pack and DC switching power supply of the power system are connected to the network data transmission system through the DC power monitoring terminal and then communicate with the remote monitoring platform connect.

The DC power monitoring terminal contains an internal resistance test unit, a battery state control device, a switch value acquisition module, a voltage acquisition module, a remote control output module, a battery charge and discharge module, an insulation monitoring unit, a switching power supply monitor, an internal resistance test unit, and a voltage acquisition module Module, remote control output module, switching value acquisition module and battery charge and discharge module are connected with the battery pack and communicate with the battery state control device; the switching power supply monitor is connected to the DC switching power supply; the battery state control device, switching power supply monitor, upper information collection terminal communication. Use these units to automatically monitor the battery voltage, battery internal resistance, current, ambient temperature, switch status, charger parameters, and insulation status online. The insulation monitoring unit is used to detect the insulation state between various components to ensure the safety of use.

The internal resistance test unit is a cycle discharge internal resistance test unit. That is to say, a group of battery groups is divided into multiple cycle groups, and the first cycle is discharged first when the internal resistance is measured each time, and then the second cycle is discharged until the last cycle. While discharging, the system collects the discharge curve of each battery at high speed, and measures the internal resistance of each battery after obtaining the voltage drop.

The chip in the voltage acquisition module solidifies the voltage coefficient, and the voltage acquisition module uses a 5PPM reference source. On this basis, high input main reactance technology can also be used to jointly ensure high accuracy and high stability of voltage acquisition.

The battery charging and discharging module is connected with each bus tie switch, bus incoming switch, charging switch and discharging switch of the battery pack through an electric switch mechanism. At the same time, its discharge load adopts a constant current load to ensure that the current of each discharge remains unchanged when the voltage changes. The electric switch mechanism mainly refers to electric switches such as relays that can complete automatic breaking.

The remote monitoring platform is one of remote PC, network short message server or a combination of these two. Receive real-time data from the DC monitoring devices of each substation, analyze and process the data, save it in the database, provide IE browsing function, use various charts to display the operating data, improve real-time performance and accuracy, and facilitate timely maintenance and processing to ensure DC System security. In addition, the remote monitoring platform can choose a network SMS server, and the alarm information can be transferred to the mobile phone of the on-duty staff in real time through SMS.

Claims (6)

1. transforming plant DC power information management system based on the three-level network framework, comprise the transforming plant DC power-supply system, it is characterized in that, the batteries of power-supply system and direct-current switch power supply pass through DC power supply monitor terminal interconnection network data transmission system and then communicate to connect with remote monitoring platform.

2. the transforming plant DC power information management system based on the three-level network framework according to claim 1, it is characterized in that, described DC power supply monitor terminal contains the internal resistance test cell, the battery condition control device, switching value acquisition module, voltage acquisition module, the remote control output module, the accumulator cell charging and discharging module, insulating monitoring unit and Switching Power Supply watch-dog, the internal resistance test cell, voltage acquisition module, the remote control output module, switching value acquisition module is connected rear and the communication connection of battery condition control device with batteries with the accumulator cell charging and discharging module, the Switching Power Supply watch-dog connects direct-current switch power supply, battery condition control device, Switching Power Supply watch-dog, upper information acquisition terminal communication.

3. the transforming plant DC power information management system based on the three-level network framework according to claim 2, is characterized in that, described internal resistance test cell is circulation discharge internal resistance test cell.

4. the transforming plant DC power information management system based on the three-level network framework according to claim 2, is characterized in that, the chip in described voltage acquisition module solidifies voltage coefficient, and voltage acquisition module adopts 5PPM a reference source.

5. the transforming plant DC power information management system based on the three-level network framework according to claim 2, it is characterized in that, each bar coupler, bus service entrance switch, charge switch and the discharge switch of described accumulator cell charging and discharging module and batteries all is connected by motor switch mechanism.

6. the transforming plant DC power information management system based on the three-level network framework according to claim 1, is characterized in that, described remote monitoring platform is a kind of or this two kinds the combination in long-range PC, network and short message server.

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