KR20080082031A - Internet based remote control system for co-generation - Google Patents

Abstract

A system for controlling and managing cogeneration remotely on the Internet is provided to check operation/abnormality of a cogeneration plant and control operation of the cogeneration plant in a remote place by extending a relay function using a two-way Internet network without modifying any design of the cogeneration plant. A site device control system(200) is formed by each device, and a site controller(210) transferring operation information detected from each device to a site PC and providing control information of the site PC to each device. A site central control system(100) is formed by the site PC including an automatic cogeneration system control program and a web server program, and controlling operation of each device of a cogeneration system by exchange information/operation data with the controller. A network between the controller and the site PC is constructed by using a data relay Ethernet(300) using a serial port, and an external remote control PC(600) is connected to through the Internet by connecting a router(400) and the Ethernet.

Description

Internet based remote control system for co-generation

1 is a schematic system configuration diagram of a cogeneration device according to the present invention

2 is a system block diagram showing a remote control and management system for cogeneration according to an embodiment of the present invention.

Figure 3 is a connection diagram of a remote control system according to an embodiment of the present invention

4 is a data flow diagram according to an embodiment of the present invention.

5 is a flowchart of a critical alarm operation according to an embodiment of the present invention.

FIG. 6 is a monitor screen graphically displaying real-time data flow as an embodiment of the present invention. FIG.

7 is a cogeneration generator and the boiler control screen as an embodiment according to the present invention

8 is a heating control screen of an embodiment as an embodiment according to the present invention

9 is a hot water control screen according to an embodiment of the present invention

10 is a generator internal monitoring control screen of an embodiment according to the present invention

11 is a power monitoring control screen according to an embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

 1: power company 2: power supply equipment

 3: water-soluble 4: gas company

 10: cogeneration generator 20: boiler

 30: heat exchanger 40: pump

 50: valve

 100: site central control system 110: site PC

120: automatic control program 130: web server program

140: system screen 141: boiler control

142: heating control 143: hot water control

144: generator control 145: power control

146: Trend 150: Database

200: field device control system 210: control device

300: Ethernet 400: Router

500: Internet 600: Remote Control PC

The present invention relates to a cogeneration power generation remote control and management system using the Internet. More specifically, the operation and abnormality information of the cogeneration unit is remotely connected through an internet-based external network connected to the integrated control system of the networked internal infrastructure. It is a general-purpose computer that does not have a separate application program for information such as sensing data and operation data, so that users can efficiently monitor and control the operation of the device while viewing a web browser screen composed of various formats to use various databases created remotely. The present invention relates to a remote control system that can maintain and maintain both main and peripheral devices including generators in optimum operating conditions.

Conventional apartments, office buildings, and small factory complexes, which consume large amounts of electric and thermal energy, receive electric energy from power companies, but there is a lot of waste heat and transmission losses due to power generation. Due to irregular and intermittent supply, there is a problem that the thermal efficiency is remarkably low. As a technology to solve this problem, it is possible to supply heat energy and electric energy at the same time. Eco-friendly and energy-saving cogeneration is in the spotlight in the era of high oil prices. Among them, gas cogeneration, which uses gas such as LNG, is eco-friendly and shifts from peak electricity demand to gas demand in summer, thereby making seasonal demand. Manageable There is an advantage that 24 hours of continuous operation is possible.

The system configuration for the small-scale cogeneration is different depending on the characteristics of the source of demand such as fuel source, power load, heating load, etc., but is generally an integrated system capable of simultaneously generating power and heating (hot water supply), as shown in FIG. For example, most of the electrical energy is produced through a small cogeneration generator 10 using a city gas supplied from a gas company 4 as a fuel source (80 to 90%), and a shortage is a power receiving facility via a commercial power distribution line ( 2) is received from the diesel power company (10) (10 to 20%), and the heating heat and hot water supply of heating recover waste heat generated from the cogeneration generator 10 and heat exchange it to the heat source side heat exchanger 30 to supply it. However, the shortage is supplemented by the heat supply by the operation of the boiler 20 as an auxiliary heat source, and can supply electric energy and heat energy, thereby simultaneously supplying the consumer 3 with heating and hot water supply. There are advantages that can be realized.

Conventional methods of maintaining a cogeneration plant that requires precise control so that the system can detect the abnormality of the device in advance to prevent safety accidents and respond quickly in case of accidents can be achieved by placing personnel in the field and operating conditions of boilers and generators. It is not only economical but also easy to cause accidents in case of absence of site manager, and it is not possible to cope with accidents quickly even in the absence of site manager. There is a problem that can not process or analyze the operating data in real time.

In recent years, the development of computer-based control technology replaces the ones that have been directly monitored and controlled by the conventional people. As a result, each unit of the cogeneration system is equipped with an automatic control device and a monitor capable of visual display, and a dedicated program is built in. It is managed by using a computer control system, but this also requires continuous and periodic monitoring and recording of the operation status of the device, which is cumbersome and requires separate management personnel. The remote control system for the cogeneration system that can be easily checked from the remote site and can quickly respond to accidents by accessing the Internet using a general-purpose computer is possible in real time monitoring and remote control through bidirectional communication.

 As a result of efforts to solve the above problems, the present inventors efficiently monitor the operation and control the operation information through the Internet connected with the integrated control system of the networked internal infrastructure at any time in the remote place, the operation information of the cogeneration unit and the auxiliary equipment. The device can be maintained in the optimal operating conditions. When an emergency accident occurs, a warning message can be delivered to the remote user terminal in real time so that a technician who has confirmed the accident does not have to visit the site. By remotely controlling the operation of the cogeneration system, a remote control system for a cogeneration unit that can flexibly cope with an accident has been developed.

The present invention has been made to solve the above problems,

It is a cogeneration system that is equipped with cogeneration generator, boiler, heat exchanger and supplies a plurality of pumps and valves as peripheral devices on the pipe and supplies heating heat and hot water at the same time.

Ethernet (module) network as a network connected to a serial communication (RS-485C) port by modulating the data detected by a plurality of sensing means attached to each device of the cogeneration system to a communication network signal of digital data that can be transmitted from a control device. By connecting to a remote PC through a site PC or a router (Internet communication module) through a remote control system for a two-way cogeneration unit that can communicate with the remote site anywhere in the country,

Provides a remote control system that can check the operation and abnormality information of the cogeneration unit remotely and control the operation of the cogeneration unit by expanding the relay function using the bidirectional internet communication network without changing the system design of the existing cogeneration unit. There is a purpose.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention for achieving the above object will be described in detail with reference to the accompanying drawings, and detailed descriptions of well-known components that may unnecessarily obscure the subject matter of the present invention will be omitted.

The present invention is a cogeneration system that is composed of a cogeneration generator 10, a boiler 20, a heat exchanger 30 and the like to supply electric energy and heat energy at the same time,

Each device unit of the cogeneration system and the operation information detected by each device unit to the control unit 210 to deliver the control information supplied from the site PC (110) to each device unit to each device unit Configure the field device control system 200,

Built-in automatic control program 120 and web server program 130 for the cogeneration system, each device unit of the cogeneration system to exchange information and operation data with the control device 210 of the field device control system 200 Configure the site central control system to the site PC (110) to control the operation,

Between the control device 210 and the internal field PC 110 to establish a connection network to the data communication relay Ethernet 300 using a serial communication (RS-485C) port as an interface means,

The Ethernet 300 is connected to the router 400 as an Internet communication module to configure a remote control system for a cogeneration unit of two-way communication connected to an external remote control PC 600 through the Internet network 500,

It enables two-way communication with remote control PC through the Internet anywhere in the country without changing the existing system design to the existing cogeneration device, so that the operation and abnormality information of the cogeneration device can be remotely checked and the device operation can be controlled in case of an error. It relates to a remote control system having an effect.

In addition, at least one field PC 110 with an automatic control program 120 and a web server program 130 for automatically controlling each unit of the cogeneration generator is a database containing data such as operation, management, alarm of the device A 150 is constructed to display the information and command data on the system detail screen 140 of the web browser formed in a predetermined format so that the user can selectively monitor the detailed screens.

The present invention is a cogeneration system device control system is connected to a networked Ethernet network and connected to an external remote control PC through a router as well as an internal site PC installed without using a specific industrial PC connected to a separate program and connected by a dedicated line Regardless of the operating system, you can check the operation and abnormality information of the cogeneration unit at any time by using a general-purpose computer and control the operation of the unit in case of an abnormality. There is a characteristic in the system configuration.

Hereinafter, preferred embodiments of the present invention will be described in detail with the accompanying drawings.

As shown in FIG. 1, the system configuration of the device underlying the present invention is as follows.

Most of the electric energy is produced through the cogeneration generator 10 using gas supplied from the gas company 4 as a fuel source (80 to 90%), and the shortage is passed through the power receiving facility 2 through a commercial distribution line. It receives power from the power company (10) (10-20%), and the heating heat and hot water supply of the heat are recovered from the cogeneration generator 10, and the heat is supplied to the heat exchanger side heat exchanger (30) for supplying heat. As a heat source, the boiler can be supplied with heat supplied by the operation of the boiler 20 and supply electric energy and heat energy, thereby enabling electric power to be supplied to the customer 3 as well as heating and hot water supply at the same time.

In addition, in the present invention, the cogeneration system is adopted as an embodiment for the city gas as a fuel source, but landfill gas (LFG: landfill gas) such as bio-gas generated from livestock wastewater or landfills is used as a fuel source. Cogeneration system can be applied.

In addition, the remote control and management system of the cogeneration system through the Internet of the present invention, as shown in Figure 5, the input of digital and analog data sent from each device unit, such as a cogeneration generator, a boiler in the field control device 210 (DI, AI) and arithmetic processing with a microprocessor (CPU) to provide to the central control system 100 in the field (DO, AO) through the Ethernet Hub (300) and conversely the central control system ( In addition to controlling the operation of the device by providing the control data sent from the 100) to the control unit 210 of the field, the operation and control data of each device of the cogeneration system of the present invention to and from the central control system 100, Remote control PC of the outside (office, home, overseas, etc.) through the Internet network 500 to the router (Firewall-embedded Internet modem, Router / Firewall) 400 connected to the Ethernet Hub (Ethernet Hub) 300 ( 600) Regardless of the operating system installed and connected, you can check the operation and abnormality information of the cogeneration unit at any time using a general-purpose computer and control the operation of the device in case of an error. It is possible to have various connections through multiple paths at the same time, so it has excellent scalability and excellent compatibility with the adoption of universal communication protocol.

The cogeneration system applied to the present invention includes a cogeneration generator 10, a boiler 20, a heat pump 30, a plurality of pump devices such as a circulation pump, a convection pump, and a valve device mounted on a connection pipe thereof. The field device control system 200 is configured by a control device 210 such as an independent control device or a sub-control device branched to a main control device corresponding to each device, and is attached to each device part. The device detects the abnormality of the device detected by the sensing device (not shown) and the operation state information and transmits the information to the control device 210 such as PLC (PLC, PROGRAMMABLE LOGIC CONTROLLER) or DDC (DIRECT DIGITAL CONTROLLER) and the control device ( 210 receives the control information from the site PC (110) mounted on the job site and transmits it to each device unit to adjust the operation of each device.

In addition, a sensing device such as a sensor (not shown) is installed in each component unit corresponding to the control device 210. In the sensing device, a device detected by digital information or an analog device, such as an amount of power measured by a digital device, is installed. The control device of the present invention converts various analog information such as operation information and inlet / outlet temperature of the heat exchanger into digital information and supplies them to each control device 210 and supports the TCP / IP protocol function to enable Ethernet communication. In 210, the data is processed as transmittable digital data.

In addition, in the transmission path between the plurality of control devices 210 of the present invention configured as described above and the field PC 110 therein, each control device 210 is connected to a network using a serial communication (RS-485C) port. Ethernet (module) to control the operation of each unit of the cogeneration system by sending and receiving information data and operation data between the control device 210 and the field PC 110 by mounting the Ethernet (module) 300 to manage By the network construction by 300, the site control of the cogeneration unit by the site PC 110 of the internal site central control system and the device remote control by an external remote PC 600 is possible at the same time.

As is well known, RS-485C is a serial communication type communication port that can transmit and receive at the same time. It can connect several devices to one line and has long-term communication with low loss. Ethernet (module) 300 allows a TCP / IP network connection and at the same time easy to build a firewall.

As described above, the field PC 110 that controls the operation of each unit scattered in the cogeneration system as described above includes an automatic control program 120 and a web server program 130 for automatically controlling the device. 150 and a plurality of system screens 140 displayed on the screen by processing a variety of operation information, such as the result of the operation process and the like is configured to configure the field central control system 100.

In addition, a router (Internet communication module) 400 is connected to the Ethernet 300 to configure a remote control system for a cogeneration unit of two-way communication connected to an external remote control PC 600 through the Internet network 500. User can remotely check the operation and abnormality information of the cogeneration device classified into the current device status, unusual situation, control status, etc. by bidirectional communication through the Internet using a universal remote control PC 600 anywhere in the country. And the abnormal operation has the effect of being able to control the operation of the cause analysis device.

And the router (Internet communication module) 400 is given a fixed IP (IP) from the Internet service provider to perform Internet data communication, the person who can remotely access the IP (IP) as a controlled device ID and password will be given differently according to the level of remote control of the field equipment.

The web server program 130 is connected to the database 150 together with the automatic control program 120 of the device, the structure for each component of the cogeneration system at any time, anywhere the Internet is provided In addition, by performing the remote monitoring and control function to control the device by enabling the search and inquiry of the screen information on which the operation state of each device is displayed, the screen of the GUI (Graphic User Interface) environment is provided as well as the HTML document.

In addition, the system screen 140, which is composed of detailed screens such as the boiler control 141, the heating control 142, the hot water control 142, the generator control 144, the power control 145, the trend 14, and the like, is displayed on the monitor. ) Is a guide pop-up menu screen linked to the database 150, and the data processed by driving the web server program 130 and the automatic control program 120 in the field PC 110 with a microprocessor as input data. Minimal click and quick search enable monitoring function to select and judge data according to the desired condition. By completing the maintenance work, the device can be operated normally.

Typically, the flow of data according to the present invention is a remote control device 210 in the field PC 110 when the data is requested to provide and control the site PC 110 via the Ethernet 200 via the Internet in the remote PC (600) ) To receive the data or control the operation of the device by connecting to a field device such as a cogeneration generator or a boiler.

In case of an emergency, situation data can be displayed on the system screen in real time, but when an important alarm message is sent to an e-mail or a mobile phone as shown in the flowchart of FIG. 5, a cogeneration generator, a boiler, etc. installed in the field When an alarm occurs in the equipment of (S1), the control device installed in the field receives an alarm signal (S2), waits for a set time (for example, 5 seconds) to determine the authenticity of the alarm (S3), If the alarm signal is maintained during the waiting time, an alarm pop-up screen is displayed on the monitoring screen of the site PC 110 and an alarm sound is generated (S4). Important messages are sent by sending a text message via -mail and a mobile phone (S5). May be different from the administrator set is to receive the message.

FIG. 6 is a trend screen, in which analog and digital data are aggregated for each data collection period and stored in a database 150, and the stored data are compared with each other in lines, 3D lines, bars, and 3D bars. It is formed as a graph viewer (VIWER) configured to be easy to use, and it is easy to diagnose the system by viewing data trends that change over time at a time. The display is selectively displayed in various formats periodically or intermittently depending on the purpose. It is possible.

In addition, the present invention adopts PID (Proportional, Differential, Integral) feedback control in controlling the measured temperature and current of the cogeneration generator in real time to increase the precision of the heater power control applied to the load to increase the temperature It can be implemented more accurately.

In controlling the generator and the boiler configured as shown in the generator and boiler control screen 141 of FIG. 7, the generator maximizes thermal efficiency of the generator by maintaining constant heat entering the generator with PID precision control. The associated circulation pump or supply / exhaust fan is controlled, and the boiler compensates for the insufficient heat in the generator by performing control by a time schedule and a return temperature.

8 is a heating control screen, in the heating control by PID precision control can supply a constant heating water without temperature deviation, and automatically control the heating in conjunction with the boiler, and the remaining heat is supplemented with heating heat By making the most of the waste heat from the generator.

9 is a hot water supply control screen, by PID precision control to maintain the temperature of the hot water tank constant without temperature variation, and automatically controls the pump device 40 such as a convection pump and a circulation pump not shown to control the temperature in the tank. It is always kept constant, and hot water is sent to each generation of consumers so that hot water can be used directly from generation to generation.

10 is a detailed screen for monitoring the inside of the cogeneration generator of the present invention, the control system of the present invention connected to the cogeneration generator 10 by RS-485 MODBUS RTU communication, the standard protocol, the internal device such as the generator internal temperature and power generation amount It can be monitored at to allow the status of the generator to be checked.

FIG. 11 is a power monitoring screen, which monitors power by displaying necessary data values by performing RS-485 MODBUS RTU communication with digital meters installed in ACB and VCB.

As a result, the present invention adds an automatic control device supporting TCP / IP protocol to each device of the existing cogeneration system, and establishes an internal and external communication network to enable Ethernet communication. It is possible to check whether the information is remote and to control the operation of the device.

The present invention described above is not limited to the above-described embodiment as various substitutions and changes can be made by those skilled in the art without departing from the technical spirit of the present invention. .

The present invention as described above is able to remotely check the operation and abnormality information of the cogeneration device by expanding the relay function using the bidirectional Internet communication network without a separate system design to the existing cogeneration device and to precisely control the operation of the device. It can be effective.

Accordingly, the present invention provides a web browser screen configured in various formats so that information such as sensed data and driving data can be used through a general-purpose computer that is not equipped with a separate application program through an internet-based external network. By effectively monitoring the operation of the device and controlling the device, it is possible to maintain both the main device and the peripheral device including the generator in optimum operating conditions.

Claims (2)

As a cogeneration system, which is composed of devices such as a cogeneration generator 10, a boiler 20, and a heat exchanger 30, and simultaneously supplies electric energy and heat energy, Each device unit of the cogeneration system and the operation information detected by each device unit to the control unit 210 to deliver the control information supplied from the site PC (110) to each device unit to each device unit Configure the field device control system 200, Built-in automatic control program 120 and web server program 130 for the cogeneration system, each device unit of the cogeneration system to exchange information and operation data with the control device 210 of the field device control system 200 Configure the site central control system 100 to the site PC 110 to control the operation, Between the control device 210 and the internal field PC 110 to establish a connection network to the data communication relay Ethernet 300 using a serial communication (RS-485C) port as an interface means, The Ethernet 300 is connected to the router 400 as an Internet communication module to configure a remote control system for a cogeneration unit for two-way communication connected to an external remote control PC 600 through the Internet network 500. Remote control and management system for cogeneration using the Internet According to claim 1, Interactive communication connected to the external remote control PC 600 via the Internet network 500 is the internal site central control by the network construction by the Ethernet 300 that can be accessed from a remote location regardless of the system operating system On-site control of the cogeneration system by the site PC 110 of the system and remote control and management system for cogeneration using the Internet, characterized in that the remote control of the device by the external remote PC (600) at the same time.

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