CN210776307U

CN210776307U - Distributed control system based on GOOSE communication

Info

Publication number: CN210776307U
Application number: CN201922395063.2U
Authority: CN
Inventors: 张伟; 张进; 王彬; 方运川; 黄小林
Original assignee: Chengdu Yun Shang Lian Lian Environmental Technology Co ltd
Current assignee: Chengdu Yun Shang Lian Lian Environmental Technology Co ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-06-16
Anticipated expiration: 2029-12-26

Abstract

The utility model relates to a supervisory equipment technical field, its aim at provide a distributed control system based on GOOSE communication. The utility model discloses a distributed control system based on GOOSE communication, which comprises intelligent equipment, a network switch and an industrial control computer; the intelligent equipment is provided with a plurality of intelligent equipment, each intelligent equipment comprises a data acquisition device and controlled equipment which are electrically connected, and the data acquisition devices and the industrial control computer are electrically connected with the network switch; and the data acquisition device is in communication connection with the controlled equipment, the data acquisition device is in communication connection with the network switch, and the network switch is in communication connection with the industrial control computer in a GOOSE communication mode. The utility model discloses possess following advantage: the plug-and-play system has the advantages of plug and play, strong real-time performance, simple construction wiring, small occupied area, high reliability and strong universality.

Description

Distributed control system based on GOOSE communication

Technical Field

The utility model relates to a supervisory equipment technical field especially relates to a distributed control system based on GOOSE communication.

Background

The automatic control system of the traditional large-scale factories such as sewage treatment plants, power plants and the like is mainly realized by adopting a Distributed Control System (DCS), and the distributed control system realizes the functions of centralized management and distributed control by utilizing the basic design idea that the PLC adopts the centralized control, operation and management and adopting a structural form of multi-layer classification and cooperative autonomy.

In the prior art, a distributed control system is provided with a PLC room in each functional area, and a corresponding PLC cabinet is installed to realize distributed control. However, usually a plurality of PLC devices will be installed in the PLC cabinet in a centralized manner, and the controlled device (including gate, valve, water pump and other monitoring devices) accesses the signal into the PLC device through the control cable, which results in that a large amount of cables will inevitably be laid between the PLC cabinet and the controlled device, and in addition, the cable transmission belongs to the analog signal transmission, and the distance between the PLC cabinet and the device is far away, so that the problems of large line loss, large electromagnetic interference and high cost exist.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving above-mentioned technical problem to a certain extent at least, the utility model provides a distributed control system based on GOOSE communication.

The utility model adopts the technical proposal that:

a distributed control system based on GOOSE communication comprises intelligent equipment, a network switch and an industrial control computer; the intelligent equipment is provided with a plurality of intelligent equipment, each intelligent equipment comprises a data acquisition device and controlled equipment which are electrically connected, and the data acquisition devices and the industrial control computer are electrically connected with the network switch; and the data acquisition device is in communication connection with the controlled equipment, the data acquisition device is in communication connection with the network switch, and the network switch is in communication connection with the industrial control computer in a GOOSE communication mode.

Preferably, the data acquisition device comprises a processor module, the processor module comprises a main controller and a peripheral circuit electrically connected with the main controller, and the peripheral circuit comprises a clock circuit, a watchdog circuit and a burning interface; the data acquisition device also comprises a communication module, a digital quantity input module and a digital quantity output module, wherein the communication module, the digital quantity input module and the digital quantity output module are electrically connected with the main controller; the communication module comprises a physical layer chip, an isolation transformer and a communication network port which are electrically connected with the main controller in sequence.

Further preferably, the data acquisition device further comprises an analog input module and an analog output module, and the analog input module and the analog output module are both electrically connected with the main controller.

Further preferably, the analog input module includes a first amplifier, a first signal isolation conversion module, an analog switch chip and an analog input interface, which are electrically connected to the main controller in sequence.

Further preferably, the analog input interface is an 8-channel analog acquisition interface, and the analog switch chip is set as an 8-channel analog switch chip in cooperation with the analog input interface; the analog input module further comprises a first photoelectric coupler, the input end of the first photoelectric coupler is electrically connected with the main controller, and the output end of the first photoelectric coupler is electrically connected with the input end of the analog switch chip.

Preferably, the analog output module includes a second amplifier, a second signal isolation conversion module and an analog output interface which are electrically connected with the main controller in sequence.

Preferably, the digital input module comprises a second photoelectric coupler and a digital input interface which are electrically connected with the main controller in sequence.

Further preferably, the digital input interface is a 15-way switching value acquisition interface.

Preferably, the digital output module comprises a third photocoupler, a relay and a digital output interface which are electrically connected with the main controller in sequence.

Further preferably, the digital output module further comprises an electric energy supply circuit, an input end of the electric energy supply circuit is electrically connected with the controller, and an output end of the electric energy supply circuit is electrically connected with an input end of the third photocoupler.

The beneficial effects of the distributed control system are concentrated in that:

1) the plug and play can be realized, and the use is convenient; specifically, the data acquisition device and the controlled equipment, the data acquisition device and the network switch and the industrial control computer are in communication connection in a GOOSE communication mode, so that the distributed control system has the characteristic of plug and play, a new controlled equipment is added or withdrawn from the industrial internet of things without complex network access or withdrawal procedures, and the normal operation of other controlled equipment in the network is not influenced.

2) The real-time performance is strong. The distributed control system selects the GOOSE as a communication protocol, and the GOOSE can directly communicate without complex network packet conversion and communication connection establishment because the GOOSE works on an MAC layer, so that the real-time performance of communication is very high.

3) The construction and wiring are simple, the occupied area is small, and the reliability is high. The utility model can be electrically connected with the controlled equipment through the analog input module, the analog output module, the digital input module and the digital output module, the utility model adopts the extremely short control cable connection between the controlled equipment, the one-to-one installation wiring is clear, the whole external output only needs one network cable and one group of power lines, the connecting line is short, so that the construction wiring is very simple; in addition, distributed installation is realized through the wiring mode, so that the controlled equipment can be controlled without a special control room, the occupied area is extremely small, and the land cost is saved; meanwhile, due to distributed installation, the fault of a single device does not affect the normal operation of other devices, the anti-interference capability of the controlled device is high, and the reliability is effectively improved.

4) The method is applicable to different controlled devices and has strong universality. In the implementation process, the main controller can acquire multiple groups of data at the same time, the processing requirements of multiple groups of data or multiple types of data can be met simultaneously, and the processing efficiency of data acquisition is effectively improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a control block diagram of the present invention;

FIG. 2 is a schematic circuit diagram of the main controller and the burning interface of the present invention;

FIG. 3 is a schematic circuit diagram of the clock circuit of the present invention;

fig. 4 is a schematic circuit diagram of a watchdog circuit according to the present invention;

FIG. 5 is a schematic circuit diagram of a physical layer chip according to the present invention;

fig. 6 is a schematic circuit diagram of the isolation transformer and the communication network port of the present invention;

fig. 7 is a schematic circuit diagram of the first amplifier, the first signal isolation and conversion module, and the analog switch chip in the present invention;

fig. 8 is a schematic circuit diagram of the analog input interface of the present invention;

fig. 9 is a schematic circuit diagram of a first photoelectric coupler according to the present invention;

fig. 10 is a schematic circuit diagram of the second amplifier, the second signal isolation and conversion module, and the analog output interface according to the present invention;

fig. 11 is a schematic circuit diagram of a second photoelectric coupler according to the present invention;

fig. 12 is a schematic circuit diagram of the digital quantity input interface according to the present invention;

fig. 13 is a schematic circuit diagram of a third photoelectric coupler, a relay, a digital output interface and an electric energy supply circuit according to the present invention;

fig. 14 is a schematic circuit diagram of a power module according to the present invention.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the invention. The present invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.

It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments of the present invention.

It should be understood that, for the term "and/or" as may appear herein, it is merely an associative relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, B exists alone, and A and B exist at the same time; for the term "/and" as may appear herein, which describes another associative object relationship, it means that two relationships may exist, e.g., a/and B, may mean: a exists independently, and A and B exist independently; in addition, for the character "/" that may appear herein, it generally means that the former and latter associated objects are in an "or" relationship.

It will be understood that when an element is referred to herein as being "connected," "connected," or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. Conversely, if a unit is referred to herein as being "directly connected" or "directly coupled" to another unit, it is intended that no intervening units are present. In addition, other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between … …" versus "directly between … …", "adjacent" versus "directly adjacent", etc.).

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and/or groups thereof.

It should also be noted that, in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed substantially concurrently, or the figures may sometimes be executed in the reverse order, depending upon the functionality/acts involved.

It should be understood that specific details are provided in the following description to facilitate a thorough understanding of example embodiments. However, it will be understood by those of ordinary skill in the art that the example embodiments may be practiced without these specific details. For example, systems may be shown in block diagrams in order not to obscure the examples in unnecessary detail. In other instances, well-known processes, structures and techniques may be shown without unnecessary detail in order to avoid obscuring example embodiments.

Example 1:

the embodiment provides a distributed control system based on GOOSE communication, as shown in fig. 1, including an intelligent device, a network switch and an industrial control computer; the intelligent equipment is provided with a plurality of intelligent equipment, each intelligent equipment comprises a data acquisition device and controlled equipment which are electrically connected, and the data acquisition devices and the industrial control computer are electrically connected with the network switch; and the data acquisition device is in communication connection with the controlled equipment, the data acquisition device is in communication connection with the network switch, and the network switch is in communication connection with the industrial control computer in a GOOSE communication mode.

The data acquisition device is electrically connected with the controlled equipment to form intelligent equipment, the intelligent equipment is electrically connected with the network switch, and the network switch is connected with the two industrial control computers through the network cable, so that an industrial internet of things is formed.

In this embodiment, the two industrial control computers are preferably set as two, the two industrial control computers are mutually standby, the two industrial control computers serve as running devices (i.e., automatic control hosts) of an automatic control software platform in the distributed control system, the two industrial control computers are accessed into the special internet of things through the ethernet, subscribe the GOOSE data of all devices in the network, issue the GOOSE data through configuration, provide a data access interface for access of a program for supply, and provide a secondary development platform for developing a process control application program. Specifically, the two industrial control computers are provided with double network ports so as to isolate a GOOSE network and other networks from hardware and improve the safety of the distributed control system; the industrial control computer is provided with a Linux Server version operating system, runs a set of self-developed automatic control software platform and provides a secondary development interface, so that a more advanced process control algorithm is implanted in the engineering implementation process conveniently, and functions of data monitoring, secondary development, data sharing and the like are realized.

The data transmitted by the data acquisition device can be uploaded to the industrial control computer through the industrial Internet of things. The industrial personal computer is internally provided with a database, the acquired data is stored in the database in the industrial personal computer, and the industrial personal computer can perform related operations such as automatic timing backup, data import and export, network management and debugging and the like on the database.

In this embodiment, the industrial control computer is provided with a data sharing interface and allows other systems following a data sharing protocol to be interconnected, and in order to make the production process of large-scale plants such as sewage treatment plants and power plants more intuitive, the industrial control computer can be electrically connected with the existing SCADA monitoring system through the data sharing interface.

Specifically, the data sharing interface is realized by SOCKET TCP protocol, the automatic control platform works in TCPSERVER mode, and other systems can establish connection and access platform data through TCP protocol. The data sharing interface inherits the characteristic of high real-time performance of the platform, when other systems are connected to the platform, the platform repacks GOOSE data subscribed in the Internet of things at regular time and sends the GOOSE data out, and after receiving burst data sent by the intelligent equipment, the burst data can be immediately sent to all other systems connected to the platform, so that the SCADA system can be monitored in real time, and user experience is better.

Further, because there are many process algorithms in large-scale plants such as sewage treatment plants, power plants, etc., and there are differences in different degrees between equipment and production processes of different manufacturers, process control logic is usually determined in specific projects. Therefore, the industrial control computer is also provided with a secondary development interface, the process monitoring codes are completely developed through the secondary development interface, and other basic function codes are solidified in the automatic control platform, so that in the engineering implementation stage, a user only needs to implant the process algorithm into the system.

Specifically, the secondary development interface adopts a dynamic link library mechanism of a Linux system, each application program is compiled into a dynamic link library, and the dynamic link libraries are automatically loaded according to configuration after the automatic control platform is started. In the configuration file, the path of the application program, the equipment data required to be used and the fixed value data are provided, and the automatic control platform can analyze and map the path, the equipment data and the fixed value data and is used by the application program.

The secondary development interface provides necessary API functions for users, and the users can obtain platform resources through the API functions, wherein the API functions comprise an API for accessing a subscription GOOSE data cache, an API for accessing a publishing GOOSE data, an API for accessing a high-precision clock, an API for adding an SOE event record and the like.

In the embodiment, the data acquisition device comprises a processor module, the processor module comprises a main controller U2 and a peripheral circuit electrically connected with the main controller U2, and the peripheral circuit comprises a clock circuit, a watchdog circuit and a burning interface CN 2; the data acquisition device also comprises a communication module, a digital quantity input module and a digital quantity output module, wherein the communication module, the digital quantity input module and the digital quantity output module are electrically connected with the main controller U2; the communication module comprises a physical layer chip U6, an isolation transformer L4 and a communication port J5 which are electrically connected with the main controller U2 in sequence.

Furthermore, the data acquisition device also comprises an analog quantity input module and an analog quantity output module, and the analog quantity input module and the analog quantity output module are electrically connected with the main controller U2.

In this embodiment, the main controller U2, the clock circuit, the watchdog circuit, the programming interface CN2, the communication module, the analog input module, the analog output module, the digital input module, and the digital output module are all electrically connected to the power module, a schematic circuit diagram of the power module is shown in fig. 14, and the power module is used to provide power support for the circuits.

In this embodiment, as shown in fig. 2, a schematic circuit diagram of a main controller U2 and a burning interface CN2 is shown, where the model of the main controller U2 is STM32F407VG, which is based on high performance

Cortex^TMThe 32-bit RISC core of M4F, the working frequency can be up to 168MHz, the core function supports single precision Floating Point Unit (FPU) of all ARM single precision data processing instructions and data types; and a set of complete DSP instruction and a Memory Protection Unit (MPU) are realized, so that the safety of the application program is improved. Fig. 3 shows a schematic circuit diagram of a clock circuit, and fig. 4 shows a schematic circuit diagram of a watchdog circuit, wherein the watchdog circuit is mainly implemented by a watchdog microprocessor monitoring circuit chip U11 with model number SP706 SEN-L/TR.

Specifically, the analog input module is used for acquiring analog signals output by the controlled device, converting the analog signals output by the controlled object into digital signals which can be identified by the main controller U2, and then sending the digital signals to the main controller U2, wherein the analog signals at the output end of the controlled device include analog signals of temperature, pressure, flow, liquid level, composition and the like. The analog quantity output module is used for acquiring digital signals output by the main controller U2 and converting the digital signals output by the main controller U2 into analog signals capable of being recognized by controlled equipment so as to control the controlled equipment, for example, to realize state control of the controlled equipment such as frequency converter regulation and valve opening control.

The digital quantity input module is used for receiving switching quantity signals which are only in two states and output by controlled equipment in the production process, converting the switching quantity signals into a signal form which can be identified by the main controller U2 and then sending the signal form to the main controller U2, wherein the switching quantity signals comprise alarm signals of the controlled equipment, start and stop signals of a motor, switching signals of a valve or a gate, automatic and manual signals of a control box and the like. The digital quantity output module is used for converting a switching value signal represented by a binary code output by the main controller U2 into a switching value signal capable of controlling the production process of the controlled equipment or displaying the state, so as to realize the state display control of the on-off control of the indicator light, or realize the state control of the controlled equipment such as the on-off control of a motor, the on-off control of a valve or a gate, the on-off control of a relay (K1 and K3) and the like.

In this embodiment, the main controller U2 is provided with a MAC layer controller, the main controller U2 provides an RMII interface for electrically connecting to the physical layer chip U6, and the physical layer chip U6 is implemented by a physical layer chip U6 supporting the RMII interface and having a model number DP 83848; the physical layer chip U6 is electrically connected to the communication port J5 through the isolation transformer L4 in sequence, and the communication port J5 can be connected to a network device such as an exchange, thereby realizing communication connection between the main controller U2 and the network device such as the exchange.

The ethernet communication module can be electrically connected with network equipment such as a switch through a network cable or an optical fiber.

Specifically, a circuit schematic diagram of the physical layer chip U6 is shown in fig. 5, and a circuit schematic diagram of the isolation transformer L4 and the communication port J5 is shown in fig. 6.

The physical layer chip U6 defines the electrical and optical signals, line status, clock reference, data encoding and circuitry, etc. required for data transmission and reception and provides a standard interface to data link layer devices. When the physical layer chip U6 sends data, that is, when data transmitted by the main controller U2 is sent to the communication port J5, the physical layer chip U6 receives the data from the main controller U2, converts the parallel data into serial stream data, encodes the data according to the encoding rule of the physical layer, and finally converts the encoded data into an analog signal and outputs the analog signal. The reverse is the flow of the physical layer chip U6 when receiving data. The physical layer chip U6 may also implement part of CSMA/CD function, and in operation, the physical layer chip U6 may detect whether there is data on the network being transmitted, wait if there is data in the transmission, and wait a random time to send out the data once the network is detected to be idle.

The isolation transformer L4 can use differential mode coupling coil coupling filter to enhance the signal transmitted by the physical layer chip U6, and couple the signal to the network device connected with the communication network port J5 by the conversion of electromagnetic field, thus not only making the communication network port J5 and the physical layer chip U6 not have physical connection but transmit the signal instead, cutting off the DC component in the signal, but also transmitting data in the devices with different 0V levels, meanwhile, the isolation transformer L4 also plays the role of lightning protection induction protection, and can avoid the physical layer chip U6 and the main controller U2 from being burned out in thunderstorm weather.

The communication port J5 is implemented by an RJ45 interface, an RMII interface, or an MII interface, and the communication port J5 is configured to receive information sent by the network device and send the information to the physical layer chip U6, or receive information sent by the physical layer chip U6 and transmit the information to the network device.

The main controller U2 can use ethernet as transmission medium through the communication port J5 and use GOOSE protocol for transmission, so that the system response reaches millisecond level and the real-time performance is high.

In the implementation process of the embodiment, signals output by the controlled device can be transmitted to the main controller U2 through the analog input module or the digital input module, the main controller U2 converts various analog signals and digital signals of an industrial field into industrial ethernet signals through the communication module and then transmits the industrial ethernet signals to the switch, the switch can transmit a driving instruction to the main controller U2 through the communication module again, and the main controller U2 drives the controlled device to operate through the analog output module or the digital output module, so that a remote user can access, monitor and control the controlled device through the ethernet.

In this embodiment, as shown in fig. 7 and 8, the analog input module includes a first amplifier U8, a first signal isolation conversion module M2, an analog switch chip U16, and an analog input interface J3, which are electrically connected to the main controller U2 in sequence.

Specifically, the analog signal refers to a 4-20mA current signal.

In this embodiment, the analog input interface J3 may collect an analog signal output by a controlled device, and then the analog signal enters the first signal isolation and conversion module M2 through the analog switch chip U16, the first signal isolation and conversion module M2 may convert a current signal of 4 to 20mA into a voltage signal of 0 to 5V, and then the voltage signal of 0 to 5V is conditioned into a voltage signal of 0 to 2.5V by the first amplifier U8 and then input to the main controller U2.

Further, the analog quantity input interface J3 is an 8-channel analog quantity acquisition interface which can acquire 8 channels of analog signals at most, the analog switch chip U16 is matched with the analog quantity input interface J3 to be set as an 8-channel analog switch chip U16, and specifically, the model of the analog switch chip U16 is MUX507 IDWR; as shown in fig. 9, the analog input module further includes a first photocoupler U17, an input terminal of the first photocoupler U17 is electrically connected to the main controller U2, and an output terminal of the first photocoupler U17 is electrically connected to an input terminal of the analog switch chip U16.

In the working process of the embodiment, since the analog switch chip U16 can be simultaneously connected to 8 analog signals, but only one of the signals can be output at the same time, the main controller U2 can control the address line of the analog switch chip U16 to switch the output channel after the photoelectric isolation is performed through the first photoelectric coupler U17 by the IO pin.

In this embodiment, as shown in fig. 10, the analog output module includes a second amplifier U18, a second signal isolation and conversion module M1, and an analog output interface J6, which are electrically connected to the main controller U2 in sequence.

Specifically, when the controlled device is controlled, a DAC pin of the main controller U2 generates a voltage signal of 0-2.5V, and then the voltage signal is conditioned by the second amplifier U18, and then the conditioned voltage signal is converted into a current signal of 4-20mA by the second signal isolation conversion module M1 and then output to the controlled device.

In this embodiment, the analog output interface J6 is a 1-way analog output interface J6; the first signal isolation conversion module M2 and the second signal isolation conversion module M1 are implemented by signal isolation conversion modules with the model number T2633P, and have the characteristics of simplicity and economy.

Specifically, the first photocoupler U17 and the second photocoupler (U1, U7, U12 and U13) are all realized by adopting a four-channel SOP packaged transistor output optocoupler TLP291_4, the cost performance is excellent, the four-channel optocoupler can directly replace 4 single-channel SSOP packaged transistor output optocouplers, the integration level can be greatly increased, and the occupied area of a PCB (printed circuit board) is reduced.

In this embodiment, as shown in fig. 11, the digital input module includes a second photocoupler (U1, U7, U12, and U13) and a digital input interface (J1 and J4) electrically connected to the main controller U2 in turn.

Specifically, the digital signal refers to a switching value with only two states, the switching value is a direct current signal with a voltage level of 24V, an independent variable of the signal is represented by an integer, a dependent variable is represented by one of finite numbers, generally, a high level is represented by a number 1, and a low level is represented by a number 0, and the controlled device can be opened or closed respectively.

Further, as shown in fig. 12, the digital quantity input interfaces (J1 and J4) are 15-way switching quantity acquisition interfaces. The digital signal can be collected by 15 paths at most, is isolated by a second photoelectric coupler (U1, U7, U12 and U13) and is converted into a direct current 3.3V signal, and then is input into the main controller U2 for collection by the main controller U2.

In this embodiment, as shown in fig. 13, the digital output module includes a third photocoupler (U14 and U15), a relay (K1 and K3), and a digital output interface J2, which are electrically connected to the main controller U2 in sequence.

When the control of the controlled device is realized, the IO pin of the main controller U2 can be used for controlling, and the IO signal output by the main controller U2 can be isolated by the third photocoupler (U14 and U15) and then the drive relay (K1 and K3) outputs a control signal.

In this embodiment, the digital output interface J2 is a 2-way switching value output interface, and is used for outputting a switching value. The relays (K1 and K3) are realized by adopting the loose relays (K1 and K3) with the models of DSP2a-DC24V, and the relays have the characteristics of small size, high capacity, capability of actually switching on and off a load, high sensitivity, high voltage resistance and the like.

Further, the digital output module further comprises a power supply circuit, an input end of the power supply circuit is electrically connected with the controller, and an output end of the power supply circuit is electrically connected with input ends of the third photocouplers (U14 and U15).

In this embodiment, the seventy resistor R70 and the fourth photoelectric coupler U10 supply power to the circuit, when the main controller U2 is reset, since potentials at two ends of a light emitting diode in the fourth photoelectric coupler U10 are the same, a collector and an emitter of the fourth photoelectric coupler U10 are not conducted, and the digital output module does not work; when the main controller U2 operates and the collector and the emitter of the fourth photoelectric coupler U10 are conducted, the digital output module starts to work, and the arrangement of the electric energy supply circuit can effectively reduce the misoperation problem of the switching value caused by faults such as program halt, running and the like.

Specifically, the model of the third photocoupler (U14 and U15) and the fourth photocoupler U10 is TLP127(TPL, U, F).

According to the embodiment, traditional controlled equipment in large-scale factories such as sewage treatment plants and power plants can be upgraded into intelligent equipment, and an efficient and real-time industrial Internet of things is established for large-scale projects. The beneficial effects of this embodiment are as follows:

4) The method is applicable to different controlled devices and has strong universality. In the implementation process, the main controller U2 can collect multiple groups of data at the same time, and can meet the processing requirements of multiple groups of data or multiple types of data at the same time, thereby effectively improving the processing efficiency of data collection.

The working method of the distributed control system based on GOOSE communication in this embodiment specifically includes the following steps:

a data acquisition device in any intelligent device acquires a digital quantity input signal and/or an analog quantity input signal of a controlled device electrically connected with the intelligent device, converts the digital quantity input signal and/or the analog quantity input signal of the controlled device into an industrial Ethernet signal, and transmits the industrial Ethernet signal to a network switch in a GOOSE communication mode;

the network switch receives industrial Ethernet signals, and broadcasts the industrial Ethernet signals to a network in a GOOSE communication mode, wherein the network refers to the industrial Internet of things;

the data acquisition device in any intelligent device in the network selectively receives and analyzes the industrial Ethernet signal according to the appointed identification code, namely, the GOOSE information is subscribed and the industrial Ethernet signal is analyzed into a GOOSE message, then the control logic of the controlled device is calculated according to the analyzed industrial Ethernet signal and a preset automatic control algorithm and a control command is generated, the control command is converted into a digital quantity output signal and/or an analog quantity output signal, and finally the digital quantity output signal and/or the analog quantity output signal are sent to the controlled device electrically connected with the controlled device, so that the controlled device electrically connected with the controlled device is controlled.

It should be noted that the data acquisition device in the intelligent device can acquire the digital quantity input signal and/or the analog quantity input signal of the controlled device, and output the digital quantity signal and/or the analog quantity signal to the controlled device. Specifically, a main controller in the data acquisition device can send a digital quantity input signal and/or an analog quantity input signal of controlled equipment to the industrial internet of things in a GOOSE communication mode; and controlling the controlled equipment to work by subscribing GOOSE information in the industrial Internet of things. In this embodiment, a plurality of intelligent devices have an intercommunication function, and specifically, the intelligent devices have a capability of broadcasting data to the whole network by publishing the GOOSE function, and can selectively receive the desired related data of the controlled device by subscribing the GOOSE function, that is, each intelligent device in the industrial internet of things has a peer function, and can publish its own data and also subscribe the data of other intelligent devices in the industrial internet of things. Therefore, all intelligent devices in the industrial Internet of things have the capability of mutual communication, and necessary conditions are provided for decentralization. In the implementation process, the intelligent equipment can issue a unique identification code at regular time or in burst for distinguishing the identities of other intelligent equipment; the user can also implant some process algorithms into the data acquisition device in the main intelligent equipment, so that the intelligent equipment can communicate with each other by self to complete process control, thereby realizing decentralization.

Further, after the network switch broadcasts the industrial ethernet signal to the network in a GOOSE communication manner, the method further includes the following steps:

the industrial control computer selectively receives industrial Ethernet signals according to the assigned identification codes and carries out calculation according to the industrial Ethernet signals so as to obtain the working state of the controlled equipment, then calculates the control logic of the controlled equipment according to a preset automatic control algorithm and generates a control command, and finally sends the control command to the network switch in a GOOSE communication mode;

the network switch receives the control command and then broadcasts the control command to the network again in a GOOSE communication mode;

the data acquisition device in any intelligent device in the network selectively receives the control command according to the appointed identification code, then converts the control command into a digital output signal and/or an analog output signal, and finally sends the digital output signal and/or the analog output signal to the controlled device electrically connected with the controlled device.

It should be understood that, in this embodiment, the industrial personal computer respectively creates a cache for the data of each intelligent device, and when the GOOSE data is received and analyzed, the software immediately refreshes the cached data for the application program to use.

In this embodiment, in order to comprehensively monitor data of a whole plant, the automatic control platform subscribes data of all intelligent devices in the plant, and has at least 1000 intelligent device data processing capabilities. The GOOSE data is transmitted in an Ethernet MAC layer, and is acquired in Linux through a SOCKET original SOCKET SOCK _ RAW, so that the mode can capture an Ethernet MAC data packet and send the Ethernet data packet in the MAC layer. In order to reduce the processing intensity of the application program, the control platform software is configured to receive only GOOSE messages, namely data messages with the type of 0x88B 8. The automatic control software platform respectively establishes cache for the data of each intelligent device, and after the GOOSE data is received and analyzed, the software can immediately refresh the cache data for the application program to use.

The platform software can add and release GOOSE through the configuration file, when one released GOOSE is added, the software can establish a cache for the newly added GOOSE data in the memory, when the GOOSE data is not changed, the platform can send the GOOSE at regular time, when the data is changed, a frame of GOOSE is sent immediately, and three frames of same data are sent by delaying for 2ms, 4ms and 8ms respectively after the change, so that the reliability of the equipment is improved.

The various embodiments described above are merely illustrative, and may or may not be physically separate, as they relate to elements illustrated as separate components; if reference is made to a component displayed as a unit, it may or may not be a physical unit, and may be located in one place or distributed over a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: modifications of the technical solutions described in the embodiments or equivalent replacements of some technical features may still be made. Such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Finally, it should be noted that the present invention is not limited to the above-mentioned alternative embodiments, and that various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the following claims, and which can be used to interpret the claims.

Claims

1. A distributed control system based on GOOSE communication is characterized in that: the system comprises intelligent equipment, a network switch and an industrial control computer; the intelligent equipment is provided with a plurality of intelligent equipment, each intelligent equipment comprises a data acquisition device and controlled equipment which are electrically connected, and the data acquisition devices and the industrial control computer are electrically connected with the network switch; and the data acquisition device is in communication connection with the controlled equipment, the data acquisition device is in communication connection with the network switch, and the network switch is in communication connection with the industrial control computer in a GOOSE communication mode.

2. The distributed control system based on GOOSE communication according to claim 1, wherein: the data acquisition device comprises a processor module, the processor module comprises a main controller and a peripheral circuit electrically connected with the main controller, and the peripheral circuit comprises a clock circuit, a watchdog circuit and a burning interface; the data acquisition device also comprises a communication module, a digital quantity input module and a digital quantity output module, wherein the communication module, the digital quantity input module and the digital quantity output module are electrically connected with the main controller; the communication module comprises a physical layer chip, an isolation transformer and a communication network port which are electrically connected with the main controller in sequence.

3. The distributed control system based on GOOSE communication according to claim 2, wherein: the data acquisition device further comprises an analog input module and an analog output module, wherein the analog input module and the analog output module are electrically connected with the main controller.

4. The distributed control system based on GOOSE communication according to claim 3, wherein: the analog input module comprises a first amplifier, a first signal isolation conversion module, an analog switch chip and an analog input interface which are sequentially electrically connected with the main controller.

5. The distributed control system based on GOOSE communication according to claim 4, wherein: the analog quantity input interface is an 8-channel analog quantity acquisition interface, and the analog switch chip is matched with the analog quantity input interface and is set to be an 8-channel analog switch chip; the analog input module further comprises a first photoelectric coupler, the input end of the first photoelectric coupler is electrically connected with the main controller, and the output end of the first photoelectric coupler is electrically connected with the input end of the analog switch chip.

6. The distributed control system based on GOOSE communication according to claim 3, wherein: the analog output module comprises a second amplifier, a second signal isolation conversion module and an analog output interface which are sequentially electrically connected with the main controller.

7. The distributed control system based on GOOSE communication according to claim 3, wherein: the digital quantity input module comprises a second photoelectric coupler and a digital quantity input interface which are electrically connected with the main controller in sequence.

8. The distributed control system based on GOOSE communication according to claim 7, wherein: the digital quantity input interface is a 15-path switching quantity acquisition interface.

9. The distributed control system based on GOOSE communication according to claim 3, wherein: the digital output module comprises a third photoelectric coupler, a relay and a digital output interface which are sequentially electrically connected with the main controller.

10. The distributed control system based on GOOSE communication according to claim 9, wherein: the digital quantity output module further comprises an electric energy supply circuit, the input end of the electric energy supply circuit is electrically connected with the controller, and the output end of the electric energy supply circuit is electrically connected with the input end of the third photoelectric coupler.