Abstract

China's power plant automation from the last century at the end of the beginning of the 80's. At present, with the automation technology, computer technology gradually matures, the face of major system integrators owners demand and market competition, keeping up the trend of technology development, development of new systems to deal with customers in the degree of automation, functionality, reliability, as well as the degree of openness the higher demands.

I. System Overview:

1, an overview of hydropower station Automation System:

• Station power plant automation system is safe, high quality, an important guarantee for efficient operation.
• At present, the vast majority of large and medium-sized power plants in China and a new power plant automation systems are computer input devices, domestic automation systems market has entered a mature stage of development.

  

• Station Automation System-wide open, hierarchical distributed architecture, the system controlled by a stop layer, network layer and the equipment is constituted strata. Station control layer functions of the site is relatively independent,互不影响; are stratigraphic interval in units, each LCU (control unit is Local Control Unit) functions relatively independent control layer in the station failure, LCU can independently its monitoring and control functions.
• Control layer is Hydropower Station / Station equipment to monitor, measure, control, management. Station control layer include the following: the operator station, station engineers, communications server. In addition, according to Power Station / Station can be configured to simulate the need for screens, rear projection systems.
• Stratigraphic interval is generally as a unit, with unit LCU, utility equipment and step-up station LCU, dam LCU and auxiliary control modules and the control of different objects scattered in the various machine next to, or in the control room. Control layer in the station and the failure of the network layer, it is able to independently accomplish the stratigraphic interval of the monitoring and control functions. LCU is the complete formation of the task unit, independent of each other, a LCU failure will not affect the operation of other LCU.
• Network layer is the layer control station and data transmission channel is pass formation. Network layer can be different from the capacity of the hydropower station / stations and different customer requirements, configure a single Ethernet, dual Ethernet and fiber-optic self-healing network. Network communications medium may be optical fiber, coaxial cable or unshielded twisted pair.
• Network structure: a single Ethernet, dual Ethernet mode.
• Characterized by a single Ethernet system: the system in the data channel bandwidth at the same time, achieve system scalability, and the form of concise, simple interface, easy installation and adjustment. In the realization of system performance at the same time, can effectively reduce system costs. System suitable for small and medium-sized hydropower stations with, as well as cost control system required a higher station.

  

• Optional dual-Ethernet model, compared to the case of a single Ethernet, effectively improve the system reliability as well as the sharing of data traffic, reducing network load, network investments have increased accordingly. Normal distribution of equipment for data exchange in the two networks, when a network failure, the automatic switch immediately to a non-fault network to ensure that normal communications systems. The network model applicable to all types of large and medium-sized hydropower stations, as well as the relatively high system reliability requirements of users.

  

• Formation is based on the situation of the plant is equipped with various functions of the LCU (now in control unit), scattered by the object can be established unit LCU, utility equipment and switching station LCU, such as dam LCU.

  

• LCU control unit is the main equipment has the following composition:
  • Is to I / O control unit: PLC + is to workstations
  • Device over the same period
  • Temperature data logging, speed signal device
  • 232/485 devices to receive the parameters, and through Industrial Ethernet bus modbus TCP protocol used to coordinate 232/485 equipment and microprocessor-based protection devices P
  • Computer monitoring and control devices
• LCU scene mode, icons are as follows:
  • LCU equipment including PLC, protection, monitoring and control devices, temperature data logging, speed governor and excitation signal as well as intelligent devices, etc., as well as access to RS485/RS232 serial port and Ethernet access is converted to the Embedded Server Unit

2, dual-network control unit LCU program

<br /> Embedded system architecture HMI60-20TU server as a master device from the power to read useful data collection; string can also link up with other intelligent device manufacturers (exciter, governor, temperature data logging, etc.); At the same time, embedded communications server with dual network cards to support dual-network redundancy, and with the PLC through ModbusTCP I set up network connections, monitoring the current crew of all of the information unit and under the control and regulation of various orders.

System of sub-grade 1), the realization of dual-network redundancy Methods: We use the Modicon Quantum Unity system hot hot double PLC control, plc at the same time each NOE is equipped with two Ethernet modules, each of the Ethernet module plc and a switch to form a network, so that we can see in the chart has formed a network of two mutually independent. Through the Embedded Server HMI60-20TU dual card, we can achieve the dual network redundancy: MODICON QUANTUM Unity Hot Standby system can automatically convert the URL, we need only determine whether the normal two networks, if the normal choice for the main PLC network monitoring, otherwise, the Vice-network monitoring. If the dual-network problems, report to the police.
2), embedded server HMI60-20TU has four serial ports, you can run the whole LC.

3, a single network control unit LCU program

System architecture integration <br /> IPC TPC-TC33 can be used as the main station equipment from 232/485 to read useful data, such as the exciter, governor, such as temperature data logging. At the same time, the integration of industrial control computer with a TPC-TC33 Ethernet communications port, and with the PLC through ModbusTCP I set up network connections, redundant control units to monitor the current unit of all the information and issued a variety of control and regulation order; of course, can also be connected servers and embedded communications, and third-party device data exchange.

System of sub-grade 1), Modicon Quantum Unity system hot hot double PLC control can be achieved automatically converted website and integration IPC there is a TPC-TC33 Ethernet port, through the modbus TCP protocol to monitor the PLC. At the same time, the integration of TPC-TC33 IPC has two serial ports, 232/485 devices can receive parameters. Therefore, the integration of industrial control computer can do TPC-TC33 master station master, control and coordination of equipment and PLC work 232/485.
2), the integration of industrial control computer of the TPC-TC33 Ethernet port, you can do slave communication modbus TCP sub-station, that is, we can the integration of TPC-TC33 IPC as a modbus TCP communication with a subset of equipment, and through Industrial Ethernet bus modbus TCP protocol used to receive monitor embedded communications server.

4, equipment department:

1), embedded server HMI60-20TU features:

• 12.1 "SVGA TFT LCD, resolution up to 800 X 600
• Dual 10/100 Base-T RJ-45 port
• Onboard VIA C3-400 MHz (Intel Celeron-400), 128 MB/256 MB RAM
• 2 RS-232, 2 months RS-232/422/485 port
• 2 USB ports and a Type I / II PC
• In line with standard card NEMA4/IP65 Al-Mg front panel
• Panel and wall-mounted installation
• Embedded real-time support for Microsoft's multi-tasking operating system WinCE.net (Chinese version) and the embedded version of the configuration software engineering.

2), the integration of TPC-TC33 IPC is a low-power embedded CPU as the core (frequency 200 MHz), high-performance embedded industrial computer integration. Characteristics:

• 10.4 inches high-brightness TFT LCD screen (resolution 640 × 480)
• Four-wire resistive touch screen (resolution 1024 × 1024)
• Embedded real-time support for Microsoft's multi-tasking operating system   WinCE.net (Chinese version) and MCGS embedded version of the configuration software (running version)
• Support for serial usb windows print and print micro printer line
• Rich communication ports: one serial port 232, a 232/485 serial port and a Ethernet port
• 24-volt DC power supply, stainless steel shell, anti-interference ability;

Second, I / O analysis:

1, the basic I / O analysis:
DI / O: 300 ~ 400;
AD / DA: a few dozen.

Third, software Description:

1, embedded server software engineering HMI60-20TU.
2, the integration of IPC Embedded TPC-TC33 configuration.

Fourth, product details:

LCU single network control system:

1, Option 1 (recommended):

2, program 2 (optional):

LCU program of dual-network control system:

1, Option 1 (recommended):

2, program 2 (optional):