JPH09160633A - Equipment management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an equipment management system which eliminates the need for an auxiliary board, etc., for a combination system. SOLUTION: Terminal devices 9a, 9b... are connected to auxiliary equipments 7a, 7b... such as a fan of a machine room 1. An electric power line 11 is used between a central management device 15 and the terminal devices 9a, 9b... for power line conveyance to send signals controlling the respective auxiliary equipments 7a, 7b... from the central management device 15 to the respective terminal devices 9a, 9b... and signals showing control results from the terminal devices 9a, 9b... to the central management device 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device management system in a cogeneration system.

[0002]

2. Description of the Related Art A so-called cogeneration system drives a generator with a gas engine or the like to generate electric power,
In addition, heat is simultaneously generated from the exhaust gas and jet cooling water. FIG. 6 shows an example of a cogeneration system, and this cogeneration system has a gas engine 101, a generator 103, a cooling water heat exchanger 105, and an exhaust gas heat exchanger 107.

City gas is supplied to and driven by the gas engine 101. The generator 103 generates power by driving the gas engine 101. The cooling water of the gas engine 101 is sent to the cooling water heat exchanger 105 to warm the warm water. The exhaust gas of the gas engine 101 is the exhaust gas heat exchanger 1
07, the exhaust gas heat exchanger 107 warms the warm water.

FIG. 7 is a schematic view of the boundary between the electric room and the machine room of such a cogeneration system. In the electric room 201, a generator board 205, an auxiliary equipment board 207, a DC power supply board (not shown) and the like are arranged. Generator board 205
Has a terminal 209, a transistor 211, and a relay 213. The auxiliary device board 207 has a relay 215, a relay 217, and a relay 219. The terminal 209 is connected to a sequencer or the like. In the machine room 203, the gas engine 10 shown in FIG.
1 and other auxiliary equipment are arranged. Reference numeral 221 denotes auxiliary equipment such as a fan, a fan pump, and a solenoid valve as auxiliary equipment.

When the operation control of the auxiliary equipment 221 is performed from the electric room 201, a voltage is applied to the terminal 209 and the relay 213,
The relay 215 is turned on. When the relay 215 is turned on, the relays 217 and 219 are turned on, and the auxiliary machine 2
21 is supplied with electric power and the auxiliary device 221 is operated.

[0006]

In the electric room 201, the generator panel 205 and the accessory panel 207 are installed close to each other, but the accessory 221 is installed apart from the accessory panel 207. A power line 223 is laid between the accessory panel 207 and the accessory 221 for each accessory.

As described above, the conventional cogeneration system requires the auxiliary equipment panel 207 and its wiring.

The present invention has been made in view of the above problems, and an object thereof is to manage equipment that does not require an auxiliary equipment panel and wiring between the electric room and the auxiliary equipment. To provide a system.

[0009]

In order to achieve the above-mentioned object, the present invention provides a terminal device installed in an auxiliary machine provided in a machine room of a cogeneration system, and a central control device provided in an electric room. A device management system comprising: a terminal device and a central management device for controlling the auxiliary device by using power line carrier.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a device management system according to an embodiment of the present invention. A gas engine and its auxiliary equipment 5 are installed in the machine room 1. As auxiliary equipment, auxiliary machines 7a, 7b, ... such as fans, pumps, solenoid valves, etc. are installed. Each auxiliary machine 7
a, 7b, ... Terminal devices 9a, 9b ,.
... is connected. 8 is a distribution board

A generator panel 13, a DC power panel (not shown), etc. are installed in the electric room 3. 12 is a distribution board. Central management device 15 and terminal devices 9a, 9 in the generator panel 13
Between b, ..., The existing power line 11 is transferred via the distribution boards 8 and 12.

FIG. 2 is a schematic configuration diagram of the terminal device 9.
The terminal device 9 is an interface (I / F) 21, CPU
23, a DIP switch 25, a modem 27 and the like.
The interface 21 controls the interface between the CPU 23 and each auxiliary machine 7. The CPU 23 performs various calculations and the like.
The dip switch 25 sets the address of the terminal device 9 by the operation of the operator. The modem 27 modulates and demodulates the signal.

FIG. 3 is a schematic block diagram of the central management unit 15. The central management device 15 has a modem 31, a CPU 33, an interface (I / F) 35, and the like. Modem 31
Modulates and demodulates the signal. The CPU 33 performs various calculations and the like. The interface 35 controls the interface with the internal circuit of the generator panel 13.

FIG. 4 shows the central management unit 15 to the terminal unit 9.
It is a format diagram of the electronic message 41 sent to. Message 41
Comprises a start bit (ST) 43, an address 45, control information 47, management information 49, and a stop bit (SP) 51. The start bit 43 indicates the beginning of the electronic message 41, and the address 45 is the address value of the terminal device with which communication is performed. The control information 47 is, for example, information that gives an instruction to start or stop the operation of the auxiliary machine 7. The stop bit 51 indicates the end of the message 41.

FIG. 5 shows the terminal device 9 to the central management device 15
It is a format diagram of the electronic message 61 sent to. Message 61
Comprises a start bit (ST) 63, an address 65, status information 67, management information 69, and a stop bit (SP) 71. The start bit 63 indicates the beginning of the telegram 61, the address 65 is the address value of the terminal device itself which sends the telegram 61, and the state information 67 is information indicating that the auxiliary machine 7 has been operated, for example. The stop bit 71 indicates the end of the telegram 61. In the terminal device 9, the digital information of “0” and “1” is modulated by the modem 27 (frequency shift method) and sent to the power line 11. The modulation frequency sent from the central management device 15 to the terminal device 9 and the modulation frequency sent from the terminal device 9 to the central management device 15 are changed.
This prevents erroneous communication. When the same frequency is used, a code is provided in the telegram to distinguish between the telegram from the central management device 15 and the telegram from the terminal device 9.

Next, the operation of this device management system will be described. The central management device 15 performs so-called power line transfer via the power line 11 in order to control a predetermined auxiliary device (for example, the auxiliary device 7a). That is, the digital signal related to the electronic message 41 is modulated into a high frequency signal, superposed on the power line 11, and sent to the terminal device side. In this case, the address 45 is loaded with the address value of the terminal device 9a, and the control information 47 is loaded with information for starting the operation of the auxiliary machine 7a. The central management device 15 polls each of the terminal devices 7a, 7b, ....

The terminal devices 9a, 9b, ...
When the address 45 of 1 is its own address, the electronic message 41 is demodulated and the auxiliary machine 7a is controlled. For example, if the control information 47 contains information to start the operation of the accessory 7a, the terminal device 9a drives the accessory 7a. Then, the electronic statement 61 is sent to the central management device 15 through the power line 11. At this time, the address of the terminal device 9a is written in the address 65, the information that the auxiliary device 7a is operated is written in the state information 67, and the electronic message 61 is sent.

The communication between the terminal device 9 and the central control device 15 employs, for example, a half-duplex communication system as a communication system, a start-stop synchronization system as a synchronization system, and an inverted double-transmission collation as a detection system. Further, in response to the call from the central management device 15, if the electronic message from the terminal device 9 cannot be received within the predetermined time, the central management device 15 sends the electronic message 41 again. If a message from the terminal device cannot be received even after retransmitting the message a predetermined number of times, a communication error occurs.

As described above, the central management unit 15 sends the telegram 41 to the corresponding terminal device for the auxiliary machine to be controlled, and receives the telegram 61 sent from the terminal device. That is, by bidirectional data communication, each auxiliary machine 7a, 7b,
It becomes possible to monitor the state of ………. Therefore, the auxiliary devices 7a, 7b, ...
.. can be controlled, the auxiliary panel and its wiring conventionally installed in the electric room 3 are not required, and the wiring work is not required, so that the cost can be reduced.

[0020]

As described above in detail, according to the present invention, it is possible to provide a device management system that does not require an auxiliary equipment panel or the like in a cogeneration system.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a device management system.

FIG. 2 is a schematic configuration diagram of a terminal device 9.

FIG. 3 is a schematic configuration diagram of a central management device 15.

FIG. 4 is a format diagram of a message 41.

FIG. 5 is a format diagram of a message 61.

[Figure 6] Schematic diagram of the cogeneration system

FIG. 7 is a schematic diagram of the vicinity of an electric room 201 and a machine room 203 in a conventional cogeneration system.

[Explanation of symbols]

 1 ... Machine room 3 ... Electric room 5 ... Gas engine and auxiliary equipment 7a, 7b ... Auxiliary equipment 9a, 9b ... Terminal device 11 ... Power line 13 ... Generator panel 15 ……… Central management device

Claims (4)

[Claims] 1. A terminal device installed in an auxiliary machine provided in a machine room of a cogeneration system, and a central management device provided in an electric room, and between the terminal device and the central management device. A device management system, characterized in that the auxiliary device is controlled and the condition is monitored by using power line carrier. 2. The device management system according to claim 1, wherein there are a plurality of the auxiliary machines, and a terminal device is installed in each of the auxiliary machines. 3. The device management system according to claim 1, wherein bidirectional communication is performed between the auxiliary device and the central management device. 4. The device management system according to claim 1, wherein the auxiliary device is a fan, a pump, or a solenoid valve.