CN1455490A - Special communication management machine of automation system of converting station for power system - Google Patents

Abstract

The motherboard 1 of the communication machine in the supervisor through the display interface and the keyboard interface is connected to the main control board 2 of the communication supervisor as well as the display and keyboard module 3 respectively. In the said main control board 2, the CPU kernel control module 21 is connected to the standby serial extensive module 22 and the industry Modem communication control module 24. The CPU kernel control module 21 through the signal line of the standby serial extensive module is connected to the signal line interface module 28 of the main control board. The CAN bus interface control module 25 is connected to the signal line interface module. Moreover, CPU kernel control module, CPLD extensive module, the CAN bus interface control module, the program storage, the data storage and the signal line interface module are connected to the address bus, the data address, the read/write control bus respectively.

Description

Special-purpose communication processor in the power system transformer substation automated system

One, technical field:

The present invention is a special-purpose equipment in a kind of power system transformer substation automated system, belongs to the technical field that the Automation of Electric Systems management equipment is made.

Two, background technology:

Along with the continuous progress of computer technology and control technology, the automation of transformation substations has obtained development fast.At present common electric substation automation system layered architecture as shown in Figure 1, the background monitoring main frame of transformer station inside, engineer station and all protective devices are in the same layer network by bus mode.The function that background host computer under this structure need be carried out mainly contains:

1, be responsible for to each protected location in the transformer station follow inspection, remote measurement, remote signalling obtaining the information of protective device, protective device is controlled and the change of operational factor by guidance command;

2, the interface of being responsible for main frame is refreshed and the renewal of host data base;

3, be responsible for communicating by letter of transformer station and remote dispatching center;

Therefore, transformer station is under this structure, and the burden of background monitoring main frame is too heavy.

At present, the RS485 universal serial bus is employed in most of electric substation automation system, and they use the communication mode of a main website (Host) to a plurality of slave stations (Slave), and it is fairly simple to implement hardware circuit, but has following defective in application in practice:

1, a main website can only be arranged, can't realize the mutually redundant Redundancy Design of many master information;

2, slave station can't the active upload important information, and real-time is relatively poor;

3, can't direct communication between each slave station, can only could intercom mutually by the main website relaying;

4, can be guaranteed on a small scale system real time, but along with the expansion of system scale, the real-time performance of system will sharply reduce;

5, anti-interference and error correcting capability is relatively poor, only be adapted at generally that the control room is inner uses, can not be used in switch occasion or the switch gap, promptly not too be applicable to and disperse the electric substation automation system of installing.

Also there are some transformer substation systems to be equipped with the ethernet communication bus at present as the intercommunicating bus of transformer station, the ethernet communication bus has the high characteristics of BTR, but because ethernet technology itself adopts the CSMA/CD technology to have the not high problem of real-time, and transformer substation system is to the exigent system of real-time, so the application of ethernet technology in the automation of transformation substations is subjected to certain restriction.Because present these problems that communication exists in the electric substation automation system, cause the communication reliability of transformer station inside to reduce, real-time is not high, so we are necessary to be provided with in transformer substation system inside the communication that special-purpose device is responsible for whole transformer station,

Three, summary of the invention 1, technical problem

The purpose of this invention is to provide a kind of many master modes that adopt simultaneously, special-purpose communication processor 2, technical scheme in the high power system transformer substation automated system of CAN Bus bus of reliability, real-time as the communication bus of transformer substation system inside

Special-purpose communication processor is made up of communication equipment motherboard, communication processor master control borad, demonstration and Keysheet module in the power system transformer substation automated system of the present invention, and the communication equipment motherboard is connected with demonstration and Keysheet module with the communication processor master control borad respectively with keyboard interface by display interface; Wherein the communication processor master control borad is by master control borad core cpu control module, the alternate serial port expansion module, the CPLD expansion module, industry Modem communication control module, CAN bus interface control module, program storage, data storage, master control borad signal wire interface module is formed, master control borad core cpu control module connects alternate serial port expansion module and industrial Modem communication control module respectively, master control borad core cpu control module is joined by alternate serial port interface signal line and master control borad signal wire interface module, industry Modem communication control module joins by carrier communication holding wire and master control borad signal wire interface module, CAN bus interface control module is joined by CAN bus communication holding wire and master control borad signal wire interface module, the CPLD expansion module is by showing and keyboard interface control line and master control borad signal wire interface module are joined, in addition, master control borad core cpu control module, the CPLD expansion module, CAN bus interface control module, program storage, data storage, master control borad signal wire interface module respectively with address bus, data/address bus, the read-write control bus joins.

Corresponding " RXD1; the TXD1 " end that meets expanded circuit U9 in the alternate serial port expansion module of " RXD1; the TXD1 " end of central processing unit U1 in the master control borad core cpu control module, corresponding " 232T; the 232R " end that meets interface JPLCD1 in the master control borad signal wire interface module of " 232T; 232R " end among the expanded circuit U9, corresponding " SELECT BUS; RW BUS " end that meets U2 in the CPLD expansion module of U10 " SELECT BUS; RW BUS " end in the CAN bus interface control module, U11 " CANLU; CANHU " end correspondence connects the end of " CANLU; CANHU " in the interface circuit " JPCOM1 " in the master control borad signal wire interface module in the CAN bus interface control module, and U7 " CANLD; CANHD " end correspondence connects the end of " CANLD; CANHD " in the interface circuit " JPCOM1 " in the master control borad signal wire interface module in the CAN bus interface control module.3, beneficial effect (1) has improved the real-time of electric substation automation system monitoring.Main cause is responsible for the inner and outside communication of transformer station specially for introduce the telecommunication management machine in electric substation automation system, alleviated the burden of background monitoring main frame, can be put into background interface to more time and refresh tasks such as work and data processing and get on.(2) the intercommunicating reliability of electric substation automation system, real-time have been increased.As communication bus, outstanding advantage is as follows in the inner CAN Bus bus that adopts of communication processor:

Because the CAN bus adopts short frame structure, the transmission time is short, is subjected to jamming rate low, has fabulous error detection effect; Adopt non-destructive bus arbitration technology, when a plurality of nodes during simultaneously to bus sending information, the node that priority is lower can initiatively withdraw from transmission, and the node of limit priority can continue to transmit data insusceptibly, thereby has saved the time of bus collision arbitration greatly; The characteristic of these CAN buses has increased the reliability of CAN bus communication.

Under single master mode in the communication protocol, the regulation background host computer is as the host node on the bus, and protective device has only etc. when calling this protective device to the backstage, and protective device is just uploaded this corresponding message, has so reduced the real-time of system.Because the CAN bus has the multi-host communication working method, protective device can initiatively send message, when incident such as action event, definite value change, switching value variation is arranged when protective device, can upload this message immediately, has increased the real-time of system.Simultaneously can be divided into different priority to each nodal information on the bus, can satisfy different real-time requirements;

In most of electric substation automation system, background host computer is connected to public telephone by MODEM and realizes telecommunication on the net, this connected mode exists shortcoming to be: because real-time, the reliability of PC are not high, cause the control centre can not understand the ruuning situation of unattended operation transformer station timely; Increased the burden of background monitoring main frame simultaneously.Therefore, the remote scheduling function is finished by communication processor, be connected to by industrial MODEM and realize carrier communication in the public telephone network.(3) have the function of power loss recovery running status, improved the reliability of system

Communication processor has the power-failure memory function, all be kept in the non-volatile data memory because communication processor is inner the data of accepting, the data that need send and the state of the current operation of supervisor, even supervisor power down, data in non-volatile data memory after newly power on also exist, can recover power down preceding state and data, being unlikely to has increased the reliability of system because of the power down obliterated data.

Four, description of drawings

Fig. 1 is the common hierarchy schematic diagram of present transformer station.

Fig. 2 is of the present invention based on the total tape communication processor of CAN integrated automation of transformation stations hierarchy schematic diagram.

Fig. 3 is the general structure block diagram of telecommunication management machine of the present invention.Communication equipment motherboard 1, communication processor master control borad 2, demonstration and Keysheet module 3 are wherein arranged.

Fig. 4 is a communication processor master control borad structured flowchart of the present invention.Master control borad core cpu control module 21, alternate serial port expansion module 22, CPLD expansion module 23, industrial Modem communication control module 24, CAN bus interface control module 25, program storage 26, data storage 27, master control borad signal wire interface module 28 are wherein arranged.

Fig. 5 is a CPLD inside modules structured flowchart of the present invention.

Fig. 6 is a communication processor master control borad electrical schematic diagram of the present invention.

Fig. 7 is the electrical schematic diagram of communication equipment motherboard 1 of the present invention and demonstration and Keysheet module 3.

Fig. 8 is the electrical schematic diagram of CPLD home address latch module of the present invention.

Fig. 9 be CPLD home address frameshit of the present invention and I the electrical schematic diagram of O expansion module.

Figure 10 is the generation module electrical schematic diagram of CPLD inner keyboard interruption pulse signal of the present invention.

Five, embodiment

Special-purpose communication processor is made up of communication equipment motherboard 1, communication processor master control borad 2, demonstration and Keysheet module 3 in the power system transformer substation automated system of the present invention, and communication equipment motherboard 1 is connected with demonstration and Keysheet module 3 with communication processor master control borad 2 respectively with keyboard interface by display interface; Wherein communication processor master control borad 2 is by master control borad core cpu control module 21, alternate serial port expansion module 22, CPLD expansion module 23, industry Modem communication control module 24, CAN bus interface control module 25, program storage 26, data storage 27, master control borad signal wire interface module 28 is formed, master control borad core cpu control module 21 connects alternate serial port expansion module 22 and industrial Modem communication control module 24 respectively, master control borad core cpu control module 21 is joined by alternate serial port interface signal line and master control borad signal wire interface module 28, industry Modem communication control module 24 joins by carrier communication holding wire and master control borad signal wire interface module 28, CAN bus interface control module 25 is joined by CAN bus communication holding wire and master control borad signal wire interface module 28, CPLD expansion module 23 is by showing and keyboard interface control line and master control borad signal wire interface module 28 are joined, in addition, master control borad core cpu control module 21, CPLD expansion module 23, CAN bus interface control module 25, program storage 26, data storage 27, master control borad signal wire interface module 28 respectively with address bus, data/address bus, the read-write control bus joins.

In order to overcome some problems that present transformer substation communication system exists, we have adopted new structure (as Fig. 2) by the transformer substation system of design, have increased the communication that communication processor is used to be in charge of inside, whole power station between background host computer and protective device; Adopt the communication bus of CAN Bus as transformer station inside; Induced one industrial MODEM by public or private telephone network realization carrier communication.Reliability, real-time, the flexibility of electric substation automation system have been increased greatly.

The structured flowchart of the master control borad of communication processor as shown in Figure 3, the communication interface that communication processor is equipped with has:

1, receive bus interface on transformer station's inner station level CAN network, this CAN bus interface realizes the communication between communication processor and the background monitoring main frame;

2, receive bus interface on the inner field level CAN of the transformer station network, this CAN bus interface realizes the communication between communication processor and the protective device;

3, standby RS232/RS485 serial communication interface, this serial ports can be used as the external debug serial ports, also can be used as kilowatt-hour meter and reads serial ports;

4, long-range carrier communication interface, it is online by this communication interface transformer station to be connected to public telephone, realizes the scheduling feature of electric substation automation system;

Other resources that communication processor is equipped with have:

5, large-screen lc shows, the running status of display communication supervisor;

6, the keyboard input can be provided with the operational factor of communication processor;

When 7, gps clock received impulse signal communication processor is used for accurate school to supervisor;

Whole device mainly divides three modules: device motherboard, liquid crystal display and keyboard, communication processor master control borad (the general construction block diagram of device as shown in Figure 4), below our hardware of introducing these three modules respectively form.

(1), device motherboard module

Motherboard is the connecting circuit plate of the signal of each submodule of device, and other module board all is inserted on the motherboard, and the anti-jamming capacity of this structure lower device is more intense, and structure is more firm, loads and unloads more convenient.Detail circuits figure provides in accompanying drawing 5.

(2), man-machine interface plate module

The circuit diagram of human-machine interface oralia as shown in Figure 5.It provides the Interface Terminal JP1 with LCD MODULE T6963C, and the signal that master board offers this terminal has: 8 bit data bus D0 ~ D7; Reset signal LCDRST; Read-write control signal WR, RD; Director data channel selecting signal A0; The chip selection signal LCD of liquid crystal control; Supply power voltage+5 and GND; And the negative pressure Vo that is used for LCD backlight control.This circuit board also provides the Interface Terminal JP_CPU1 that gets in touch with the control signal of motherboard.Its signal that provides is controlled the signal L1 ~ L7 of LED lamp on/off in addition except above-mentioned, serial communication signal 232R, 232T.Running mark lamp LED1 ~ 7 of device are normal in order to display unit, report to the police, and action, states such as electric power thus supplied provide the debug serial port to communication processor simultaneously on display floater.

(3), communication processor master board

The master board of communication processor is the core and the soul of whole communication processor.Its hardware configuration constitutes block diagram as shown in Figure 3, mainly is made of following module.

(1) CPU module 80C320;

(2) program storage and non-volatile data storage and real-time clock module;

(3) CPLD signal synthesis processing module;

(4) communication interface of the communication interface of transformer station's level CAN network and field level networks CAN network;

(5) alternate serial port unit;

(6) liquid crystal interface, communication interface and industrial MODEM interface;

Introduce each module on the master control borad respectively by function below.

1, core cpu control module

The circuit diagram of core cpu control module according to the requirement of automation of transformation substations data communication, has been selected the CPU of 8 high-performance embedded microprocessor DS80C320 of DALLAS company as communication processor here for use as shown in Figure 6.The execution speed of DS80c320 is fast, the maximum crystal oscillator frequency that allows is 33MHz, adopted the single cycle cycles per instruction, under the identical crystal oscillator, execution speed is generally 2.5 times of MCS51, and DS80C320 provides 14 interruptions, wherein 6 external interrupt, can satisfy the demand of interruption, improve the real-time of communication processor simultaneously; DS80C320 provides 2 serial ports.

Device has adopted active crystal oscillator, provides clock pulse by CPU_CLK to CPU.Because used industrial MODEM baud rate is 2400Kbps, therefore selecting crystal oscillator frequency for use is 11.0592MHZ.

2 serial ports that CPU provides, we provide standby RS232 serial communication interface holding wire RXD1, the TRD1 of a serial ports by the Max232 chip, and holding wire RXD, the TRD of another serial ports and 2 IO mouth DTR, DCD link to each other with industrial MODEM and realize carrier communication.

X5043 is the hardware watchdog circuit, can guarantee the software reliable reset when the device software fault, and its control signal WDT, SO, SI, SCK control by CPU.

CPU can have 4 external interrupt signal line: SDINT, SUINT, KINT, S_INT simultaneously.SDINT is connected to the interrupt signal line of the CAN bus control unit on the field level CAN network as communication processor; SUINT is connected to the interrupt signal line of the CAN bus control unit on the level CAN of the transformer station network as communication processor; One KINT is as having a button to press down the interrupt signal of generation in 8 buttons on the panel, and this root interrupt signal line has CPLD to provide; S_INT is the interrupt signal during as the accurate school of GPS, and when this interrupt signal line required communication processor to carry out accurate school immediately, method can be as accurate as the ms level when this.

2, CPLD expansion module

The CPLD chip internal is based on programmable macrologic unit, and programmable line concentrates on a global routing district.It can allow to use extensive programmable logic chip to substitute traditional 74LS series and small-scale GAL logic, thereby the interface in system has under the situation of specific (special) requirements, as long as the change logical file can satisfy customer requirements, make system flexible, and shortened the construction cycle.The model that adopts XILINX company to produce in the native system is the CPLD of XC9572,

The CLPD module functions has following 3 aspects (CPLD inside modules structured flowchart is shown in 7):

1. latching of address because the least-significant byte address wire of 80c320 and most-significant byte address wire is public, latched (as shown in Figure 8) to 8 bit address lines by address latch signal line ALE.

2. the expansion of address decoding circuitry and IO mouth.The chip selection signal that produces has (as shown in Figure 9): real-time timepiece chip 1644 chip selection signals 1644, be connected to CAN controller in the field level networks chip selection signal SJAD, be connected to the chip selection signal SJAU of CAN controller in the station level network, the chip selection signal LCD of liquid crystal.The I/O of expansion has: to modulating signal LIGHT1, LIGHT2 on the reset signal LCDRST of LCDs, the control man-machine interface, LIGHT3 etc.

3. the transformation of level signal (as shown in figure 10), because being level, the external interrupt signal of 80C320 interrupts, in order to prevent that keyboard interrupt (for level signal) from repeating to produce, if must be designed to after a button presses, must on S_INT interrupt signal line, produce interrupt level, and interrupt routine is when withdrawing from, and the level on the S_INT interrupt signal line is invalid.

3, memory module is not because CPU (80c320) inside of adopting has program storage, therefore design has external program storage circuit diagram as shown in Figure 6 on the master control borad), by the wire jumper S2 in the circuit diagram, S3 selects EPROM27C256 or EEPROM28C256 for use; If adopt inside to have the CPU of FLASH (flash memory), can select by wire jumper S1 so.Supervisor has been selected non-volatile data storage and real-time timepiece chip 1644, and the power down maintenance RAM of 32K and the real-time clock that is accurate to second are arranged in this chip, by the use to non-volatile RAM, has increased the reliability of system.

4, CAN bus interface control module

The communication network of transformer station inside can be divided into two-layer, and background monitoring main frame and communication processor belong to station level communication network;

Communication processor and protective device belong to the field level communication network, and communication processor is connected on the CAN network by CAN controller and CAN transceiver.The CAN controller that supervisor is selected for use is SJA1000 and CAN transceiver 82C250 (circuit diagram as shown in Figure 6).

CAN controller SJA1000 chip is mainly by realizing CAN bus protocol part and forming with the Microprocessor Interface partial circuit, can finish the physical layer of CAN bus protocol and the function of data link layer, support CAN2.0A agreement and CAN2.0B agreement, have two kinds of mode of operations of BasicCan and PeliCan; SJA1000 inside provides 128 registers, and CPU is by the register of 8 bit address lines visit SJA1000 inside; Accepting buffering area provides the FIFO of 64 bytes, at first be placed to by the data of accepting filter on the CAN bus and accept in the buffering area, accept register as accepting the mapping register of buffering area, in accepting register, when empty, accept data in the buffering area and can be filled into and accept in the register; In order to strengthen the fault processing function, inside provides special function register, and arbitration is lost and caught register relevant for losing arbitration bit position information, and malfunction code is caught and occurred wrong type and positional information on the register-stored bus.

CAN transceiver 82C50 is the interface of CAN protocol controller and physical bus, provides to the differential transmitting capacity of bus with to the differential receiving ability of CAN controller.

5, alternate serial port expansion module

Communication processor provides RS232 alternate serial port, and this serial ports connects away by panel and can be used as debug serial port.By the MAX232 chip Transistor-Transistor Logic level is converted to the RS232 level signal, the signal of Transistor-Transistor Logic level is the RX1 from CPU, and TX1 is 232T through the holding wire after the conversion, and 232R sees circuit theory Fig. 6 for details.

6, LCD interface, communication interface and industrial MODEM interface

Communication processor by three ports be connected respectively on the panel, industrial MODEM, communication interface (as shown in Figure 6).

Be connected on the panel by the JP_LCD1 terminal, comprising carrying the relevant holding wire of standby debug serial port on display lamp is relevant on the relevant holding wire of the holding wire relevant with liquid crystal display on the panel, panel upper keyboard, the panel holding wire and the panel.

Be connected to communication interface by the JP_COM1 socket, comprise: the communication port outlet CANHU holding wire of the level of standing CAN network, CANLU holding wire; The communication port outlet CANHD holding wire of field level CAN network, CANLD holding wire; Standby RS232 serial communication passage 232T, 232R; Public telephone network carrier communication line INLINE1, INLINE2, ONLINE1, ONLINE2:

By the JP_MOD1 socket industrial MODEM is connected to and realizes telecommunication on the master control borad, supervisor has been selected the Nanjing XCM-2400bps intelligent industrial MODEM that produces of wound Electronics Co., Ltd. earlier for use.The main feature of this industry MODEM is as follows: low in energy consumption, signal indication, automatic-answering back device or manual answering be provided.Interface signal line between industry MODEM and the master control borad mainly contains: the 5V power supply; Data line (TxD, RxD); Control signal wire (carrier detect holding wire DCD, data terminal ready signal line DTR), data terminal ready signal DTR is as the control switch of industrial MODEM, when DTR puts high level and forbids MODEM work, initialization MODEM, at first must put low level to DTR.By detected carrier detection signal line DCD as judging whether industrial MODEM locates to have set up carrier link.

" RXD1; TXD1 " end correspondence of the central processing unit (U1) in the master control borad core cpu control module (21) connects " RXD1; TXD1 " end of expanded circuit (U9) in the alternate serial port expansion module (22), " 232T; 232R " end correspondence in the expanded circuit (U9) connects " 232T; 232R " end of interface (JPLCD1) in the master control borad signal wire interface module (28), " the SELECT BUS; RW BUS " of (U10) end correspondence connects " SELECT BUS; the RW BUS " end of (U2) in the CPLD expansion module (23) in the CAN bus interface control module (25), and " CANLU; CANHU " of (U11) end correspondence connects the end of " CANLU; CANHU " in the interface circuit " JPCOM1 " in the master control borad signal wire interface module (28) in the CAN bus interface control module (25).According to the above, just can realize the present invention.

Claims (2)

1, special-purpose communication processor in a kind of power system transformer substation automated system, it is characterized in that this supervisor is made up of communication equipment motherboard (1), communication processor master control borad (2), demonstration and Keysheet module (3), communication equipment motherboard (1) is connected with demonstration and Keysheet module (3) with communication processor master control borad (2) respectively with keyboard interface by display interface; Wherein communication processor master control borad (2) is by master control borad core cpu control module (21), alternate serial port expansion module (22), CPLD expansion module (23), industry Modem communication control module (24), CAN bus interface control module (25), program storage (26), data storage (27), master control borad signal wire interface module (28) is formed, master control borad core cpu control module (21) connects alternate serial port expansion module (22) and industrial Modem communication control module (24) respectively, master control borad core cpu control module (21) is joined by alternate serial port interface signal line and master control borad signal wire interface module (28), industry Modem communication control module (24) joins by carrier communication holding wire and master control borad signal wire interface module (28), CAN bus interface control module (25) is joined by CAN bus communication holding wire and master control borad signal wire interface module (28), CPLD expansion module (23) is by showing and keyboard interface control line and master control borad signal wire interface module (28) are joined, in addition, master control borad core cpu control module (21), CPLD expansion module (23), CAN bus interface control module (25), program storage (26), data storage (27), master control borad signal wire interface module (28) respectively with address bus, data/address bus, the read-write control bus joins.

2, special-purpose communication processor in the power system transformer substation automated system according to claim 1, it is characterized in that " RXD1; TXD1 " end correspondence of the central processing unit (U1) in the master control borad core cpu control module (21) connects " RXD1; TXD1 " end of expanded circuit (U9) in the alternate serial port expansion module (22), " 232T; 232R " end correspondence in the expanded circuit (U9) connects " 232T; 232R " end of interface (JPLCD1) in the master control borad signal wire interface module (28), " the SELECT BUS; RW BUS " of (U10) end correspondence connects " SELECT BUS; the RW BUS " end of (U2) in the CPLD expansion module (23) in the CAN bus interface control module (25), " CANLU; CANHU " of (U11) end correspondence connects the end of " CANLU; CANHU " in the interface circuit " JPCOM1 " in the master control borad signal wire interface module (28) in the CAN bus interface control module (25), and " CANLD; CANHD " of (U7) end correspondence connects the end of " CANLD; CANHD " in the interface circuit " JPCOM1 " in the master control borad signal wire interface module (28) in the CAN bus interface control module (25).

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