基于GPRS的双电源备自投及配电参数监控系统的设计与实现

发布时间：2018-01-21 15:10

本文关键词： 备自投装置电能质量 S7-200PLC GPRS　出处：《内蒙古科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：传统的双电源备自投装置大多由继电器、接触器及相应硬件连接组成，根据不同的运行要求构成备自投回路，价格便宜但装置体积大、开关动作慢、触点易损坏，很大程度的影响供电的连续性和稳定性；又由于自身功能少、灵活性差的缺点，现今电力系统的规模日渐变大、结构日渐复杂，性能要求也越来越高，传统的备自投装置已经不太实用。本论文针对传统备自投装置的各种弊端进行研究，设计了由S7-200PLC控制的完整的备自投系统，选择具有Modbus通讯协议的智能电能测量仪和智能断路器，用于测量供电电源的电能参数和控制备用电源的投切，并通过Profibus-Dp网络将实时数据交换到本地监控站。现场总线的使用取代传统点对点的硬件接线，，使通讯稳定可靠，保障供电质量的同时提高供电系统的自动化水平。设计中，为解决企业远距离办公中心对现场供电系统运行情况、配电参数难以监控的问题，创造性的采用GPRS无线通讯方式，将现场系统的实时数据传输到监控中心，并显示在WinCC监控画面中，工作人员通过在监控画面上的简单操作实现对现场设备的远距离操控。本设计主要从以下几点进行详细研究：（1）双电源备自投系统的设计。主要包括备自投控制系统的电源供给、工作模式和工作方式。其中工作方式中的控制规则是备自投装置投切必须遵循的原则，也是系统软、硬件设计时的关键。备自投装置的工作方式有明备用和暗备用两种，本设计中的备自投装置正常情况下工作在暗备用方式。在系统软件设计中同时有暗备用和明备用的控制程序，仅改动少许外部的硬件接线，便可改变备自投的工作方式，提高了设备的可移植性。（2）系统的网络结构及网络配置。本监控系统主要由远程监控站、GPRS无线通讯网络、本地监控站、现场设备及终端站组成。系统根据各组成部分的功能不同，配置的不同的软、硬件。（3）系统的软、硬件的实现。为了节省设计成本，在每个坑口变电站的两个变压器的二次侧均安装由电压互感器和电压继电器组成的检测电路，对两路进线电源的电压状态进行检测，通过本机集成的I/O口采集到PLC中。三个智能断路器通过Modbus网络将其合、分闸状态信号上传到PLC；安装在两低压母线上的智能电能测量仪通过Modbus网络分别将各自母线上的配电参数上传到PLC中，主要包括电压、电流、有功功率、无功功率和功率因数。S7-200PLC通过这些数据判断供电电源正常与否，进而通过Modbus网络发出信号控制智能断路器的通断。PLC通过EM277经过Profibus-Dp网络将实时数据交换到本地监控站，并显示在本地PC机上的WinCC监控画面上。与此同时，PLC通过无线通讯模块MD720-3将数据传递给GPRS公网，进而在远程监控PC机的WinCC上显示出来。本监控系统以S7-200PLC为控制器，使供电系统既可以工作在暗备用方式也可以工作在明备用方式，在本地监控站和远程监控站的监控画面上，监视每个坑口变电站供电电源的实时配电参数、各断路器工作状态、故障报警记录等，以及选择手动、自投自复或者自投不自复模式。使得企业供电电源的连续性和稳定性得到了保障，实现对系统的有效监控。
[Abstract]:The traditional dual power automatic switching device mostly by relays, contactors and corresponding hardware connected, according to the different requirements of operation constitute autorestart loop, cheap but large volume of the device, switch to slow, easy contact damage, affect the continuity and stability of power supply greatly; and because of its less functional flexibility the shortcomings of current power system scale becomes larger, the structure is more complex, the performance requirements are also getting higher and higher, the traditional automaticswitchoverdevice is not very practical.
Aiming at the disadvantages of conventional lbtz were studied, designed by the S7-200PLC to control the complete autorestart system with Modbus communication protocol of the intelligent power meter and intelligent circuit breaker, power supply for the measurement of power parameters and control standby power switching, and through Profibus-Dp network the real-time data exchange to the local monitoring station. Using the field bus to replace the traditional point to point wiring of hardware, the communication is stable and reliable, ensure the quality of power supply and improve the automation level of the power supply system. In the design, in order to solve the enterprise remote office center on the site operation of power supply system, power distribution parameters monitoring difficult problem, creative the use of GPRS wireless communication system, the real-time data transmission to the monitoring center, and displayed on the WinCC monitor screen, the staff through the monitor screen The remote control of the field equipment is realized by the simple operation.
This design is mainly studied from the following points:
(1) double power supply self design investment system. Mainly includes auto switching power supply control system, work mode and work mode. The control rules of work is prepared from the cast devlce must follow the principle of system software and hardware design is the key, the automaticswitchoverdevice work. Have two spare spare Ming and dark, this design automaticswitchoverdevice normally work in the standby mode. The control program at the same time dark dark and spare spare Ming in the software design of the system, only a little change of external hardware connection, they can change autorestart work, improve equipment the portability.
(2) the network structure and network configuration of the system. The monitoring system is mainly composed of remote monitoring station, GPRS wireless communication network, local monitoring station, field equipment and terminal station. The system has different soft and hardware configurations according to the functions of each component.
(3) the system software and hardware implementation. In order to save the design cost, detection circuit composed of a voltage transformer and voltage relay are installed on the two side of the two transformer substation of each pit, to detect the voltage state of the two power lines into the collection, from the PLC to the machine set into the I/O three. Intelligent circuit breaker will be through the Modbus network, the separating state signal uploaded to PLC; installed in two on the low voltage bus intelligent power meter through the Modbus network will upload their distribution parameters respectively in the bus to PLC, including voltage, current, active power, reactive power and the power factor.S7-200PLC through these data to determine the power supply is normal or not, and then through the Modbus network signal control circuit breaker intelligent on-off.PLC by EM277 after Profibus-Dp network data exchange to the local monitoring station, and It is displayed on the WinCC monitoring screen on the local PC. At the same time, PLC transfers data to the GPRS public network through the wireless communication module MD720-3, and then displays it on the WinCC of remote monitoring PC machine.
The monitoring system based on S7-200PLC controller, the power supply system can not only work can also work in the Ming Dynasty in the dark standby mode standby mode, in the local monitoring station and the remote monitoring station on the monitor screen, real-time monitoring of each substation pit distribution parameters of power supply, the circuit breaker status, fault alarm record, and manual selection automatic recovery, or since the vote no longer makes mode. The continuity and stability of the power supply enterprises are guaranteed to achieve effective control of the system.

【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM762.1;TP277

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