CN218481766U

CN218481766U - Hydroelectric generating set water machine protection system based on redundant PLC

Info

Publication number: CN218481766U
Application number: CN202221325164.8U
Authority: CN
Inventors: 刘瞳昌; 胡涵; 张津; 郗发刚; 张李小璟; 平金伟; 刘进涛; 胡绍谦; 张军华; 蒋波; 周进; 张涵超; 张勇; 翟亮晶; 李银
Original assignee: NR Engineering Co Ltd; Xian Thermal Power Research Institute Co Ltd; Huaneng Lancang River Hydropower Co Ltd
Current assignee: NR Engineering Co Ltd; Xian Thermal Power Research Institute Co Ltd; Huaneng Lancang River Hydropower Co Ltd
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2023-02-14
Anticipated expiration: 2032-05-30

Abstract

The utility model discloses a hydroelectric generating set water machine protection system based on redundant PLC, which comprises a main PLC module, an accident backup PLC module and a computer monitoring system; the main PLC module is provided with a main controller, a main power supply module, a main communication module, a main data acquisition module and a main signal output module, and the accident backup PLC module is provided with an auxiliary controller, an auxiliary power supply module, an auxiliary communication module, an auxiliary data acquisition module and an auxiliary signal output module. The utility model discloses configured main PLC module as main protection and accident reserve PLC module as reserve protection, dual assurance hydroelectric generating set is at the emergency shutdown under the accident situation, has avoided the wiring that uses conventional relay return circuit to cause complicacy, the poor scheduling problem of reliability.

Description

Hydroelectric generating set water machine protection system based on redundant PLC

Technical Field

The utility model relates to a thermotechnical protection field.

Background

The large hydroelectric generating set is complex in system, and the operation stability of the large hydroelectric generating set is very important for safe power supply of an electric power system. When the unit breaks down, the water machine protection system needs to quickly disconnect and stop the unit. For example, when a water turbine is over-speed, an oil pressure device is low in oil pressure, a system is over-current and the temperature of a bearing bush is over-high, a protection system of the hydroelectric generating set firstly needs to accurately acquire corresponding switching value displacement and analog quantity out-of-limit signals, and then an accident shutdown process is started after logical judgment. The protection device can transmit action output signals to devices such as an outlet switch, an excitation system and a speed regulation system, a driving unit actuating mechanism can rapidly reduce unit active and reactive power, close a guide vane, divide a switch, reduce excitation and remove excitation and the like, and the protection device can directly fall into a water inlet accident gate in emergency, so that the safety of the unit and a power grid is ensured.

A traditional hydroelectric generating set water machine protection system is composed of a main PLC and a conventional relay loop, wherein the main PLC is used as main protection of a set, and the conventional relay loop is used as backup protection. Such protection systems suffer from the following disadvantages: (1) The protection circuit that the relay form was built has the adhesion of electrocution, coil burnout scheduling problem, and the reliability is not high. (2) The control loop has complex wiring, poor expandability and large workload of operation and maintenance. (3) The pure relay loop cannot be directly connected with an analog quantity signal. (4) The action process of the pure relay loop cannot be automatically recorded, and the accident analysis is inconvenient.

Disclosure of Invention

In order to solve the problems, the invention provides a hydroelectric generating set water machine protection system based on a redundant PLC.

In order to realize the purpose, the technical scheme of the invention is as follows:

a hydroelectric generating set water machine protection system based on redundant PLC comprises a main PLC module, an accident backup PLC module and a computer monitoring system, wherein the main PLC module is provided with a main controller, a main power supply module, a main communication module, a main data acquisition module and a main signal output module, and the accident backup PLC module is provided with a secondary controller, a secondary power supply module, a secondary communication module, a secondary data acquisition module and a secondary signal output module;

the main communication module is in communication connection with the computer monitoring system through Ethernet, and the auxiliary communication module is in communication connection with the main communication module through a one-way serial port; the main controller is respectively connected with the main data acquisition module and the main signal output module, and the auxiliary controller is respectively connected with the auxiliary data acquisition module and the auxiliary signal output module.

Furthermore, the main controller, the main power module, the auxiliary controller and the auxiliary power module are all in redundant configuration.

Further, the main controller comprises a first main controller and a second main controller, the main power supply module comprises a first main power supply module and a second main power supply module, the first main power supply module is connected with the first main controller, and the second main power supply module is connected with the second main controller; the auxiliary controller comprises an auxiliary controller I and an auxiliary controller II, the auxiliary power supply module comprises an auxiliary power supply module I and an auxiliary power supply module II, the auxiliary power supply module I is connected with the auxiliary controller I, and the auxiliary power supply module II is connected with the auxiliary controller II.

Furthermore, the main data acquisition module, the main signal output module, the auxiliary data acquisition module and the auxiliary signal output module are respectively provided with an independent loop.

Furthermore, the main data acquisition module and the auxiliary data acquisition module are both provided with a switching value signal anti-shake function unit and an analog signal quality judgment function unit.

Furthermore, the main signal output module and the auxiliary signal output module are both provided with a failure safety function unit.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the utility model discloses configured main PLC module as main protection and accident reserve PLC module as reserve protection, dual assurance hydroelectric generating set is at the emergency shutdown under the accident situation, has avoided the wiring that uses conventional relay return circuit to cause complicacy, the poor scheduling problem of reliability.

2. The utility model discloses well main PLC module and accident reserve PLC module have all configured double controller, and the double controller is the activestandby each other, and data sharing, main PLC module or accident reserve PLC module's single controller break down and do not influence the function of system, have further improved hydroelectric generating set water machine protection system's reliability.

3. The utility model discloses well accident reserve PLC module sends to computer monitoring system on with data through main PLC module, can monitor the running state of accident reserve PLC module, takes notes its operating data, the accident analysis of being convenient for. Meanwhile, the accident backup PLC module is isolated from the computer monitoring system, and does not receive the instructions of the monitoring system, so that the independence and the reliability of the accident backup PLC module are ensured.

4. The utility model discloses well data acquisition module has switching value signal anti-shake functional unit and analog signal quality judgement functional unit, guarantees data acquisition's exactness; the signal output module is provided with a failure safety function unit, so that misoperation can be avoided and an alarm can be given in time when the PLC fails.

Drawings

The present invention will be further described with reference to the accompanying drawings and detailed description.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

It will be appreciated by those skilled in the art that features from the examples and embodiments described below may be combined with each other without conflict.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Words such as "upper," "lower," "front," "rear," and the like, which indicate orientation or positional relationships, are used solely to facilitate the description of the invention and to simplify the description, and do not indicate or imply that the referenced devices/elements must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural forms "a plurality" includes more than two referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either directly or indirectly through intervening media, either internally or in any other relationship.

Referring to fig. 1, an embodiment of the present invention provides a redundant PLC-based hydro-power unit water machine protection system, which includes a main PLC module, an accident backup PLC module, and a computer monitoring system; the main PLC module is provided with a main controller, a main power supply module, a main communication module, a main data acquisition module and a main signal output module, and the accident backup PLC module is provided with a secondary controller, a secondary power supply module, a secondary communication module, a secondary data acquisition module and a secondary signal output module;

the main communication module is in communication connection with the computer monitoring system through the Ethernet and is responsible for uploading the measuring point information of the main PLC module to the computer monitoring system and receiving the instruction of the computer monitoring system; the auxiliary communication module is in communication connection with the main communication module through a one-way serial port so as to enable the measuring point information of the accident backup PLC module to pass through the main PLC module to the computer monitoring system; the main controller is respectively connected with the main data acquisition module and the main signal output module, and the auxiliary controller is respectively connected with the auxiliary data acquisition module and the auxiliary signal output module and is used for respectively taking charge of the acquisition of the accident signals of the unit and the output of the tripping signals.

Referring to fig. 1, the main controller, the main power module, the sub-controller and the sub-power module are all configured redundantly. The main controller comprises a first main controller and a second main controller, the main power supply module comprises a first main power supply module and a second main power supply module, the first main power supply module is connected with the first main controller, and the second main power supply module is connected with the second main controller; the secondary controller comprises a primary controller I and a secondary controller II, the secondary power supply module comprises a primary power supply module I and a secondary power supply module II, the primary power supply module I is connected with the primary controller I, and the secondary power supply module II is connected with the secondary controller II.

Specifically, a first main controller and a second main controller of the main PLC module are in a main-standby state, share information and are responsible for logic operation of main protection of the unit, and the main PLC module is powered by double power supplies.

The first auxiliary controller and the second auxiliary controller of the accident backup PLC module are in a master-standby state mutually, share information and are responsible for the logic operation of the accident backup protection of the unit, and the double power supplies supply power for the accident backup PLC module.

Referring to fig. 1, the main data acquisition module, the main signal output module, the auxiliary data acquisition module and the auxiliary signal output module respectively have independent loops.

The main data acquisition module and the auxiliary data acquisition module are respectively provided with a switching value signal anti-shake functional unit and an analog value signal quality judgment functional unit.

The main signal output module and the auxiliary signal output module are both provided with a failure safety function unit.

The specific working principle of this embodiment is as follows:

and a main data acquisition module of the main PLC module receives accident signals of the hydraulic power plant.

When a switching value accident signal, such as a speed regulator accident low oil pressure, a unit rotating speed of more than 104 percent, a generator-transformer unit protection action and other signals are shifted, the shifting signals can be sent to a main controller through a switching value signal anti-shake function unit, after the main controller compares a signal value with a fault value, if the signal value is equal to the fault value, an accident shutdown process can be started, and the device such as an outlet switch, an excitation system and a speed regulating system is driven to rapidly reduce the unit active and reactive power, close a guide vane, divide a switch, reduce excitation and extinguish magnetism through a signal output module.

When the analog quantity signals, such as the temperature of an oil groove, the flow rate of cooling water and the like, are judged to have normal quality through the analog quantity signal quality judgment functional unit, the real-time value is sent to the main controller, the main controller compares the real-time value with a set fault limit value, and if the real-time value is out of limit, the main controller also starts an accident shutdown process.

The working process of the accident backup PLC module is consistent with that of the main PLC module, and the accident backup PLC module is provided with an independent data acquisition loop and a signal output loop. For fault signals, the main PLC module and the accident backup PLC module can respectively collect the fault signals, and the fault signals are subjected to logic judgment respectively and then simultaneously drive an outlet switch, an excitation system, a speed regulating system and other devices through the main signal output module and the auxiliary signal output module.

The protection system can be ensured to operate correctly when the hydroelectric generating set fails. The accident backup PLC module is independent of the computer monitoring system, and data are sent to the main PLC module through the one-way serial port so as to facilitate accident analysis.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the above specific embodiments. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims

1. The utility model provides a hydroelectric generating set water machine protection system based on redundant PLC which characterized in that:

the emergency backup PLC system comprises a main PLC module, an emergency backup PLC module and a computer monitoring system, wherein the main PLC module is provided with a main controller, a main power supply module, a main communication module, a main data acquisition module and a main signal output module, and the emergency backup PLC module is provided with a secondary controller, a secondary power supply module, a secondary communication module, a secondary data acquisition module and a secondary signal output module;

2. The hydroelectric generating set water machine protection system of claim 1, wherein: the main controller, the main power supply module, the auxiliary controller and the auxiliary power supply module are all in redundant configuration.

3. The hydroelectric generating set water machine protection system of claim 2, wherein: the main controller comprises a first main controller and a second main controller, the main power supply module comprises a first main power supply module and a second main power supply module, the first main power supply module is connected with the first main controller, and the second main power supply module is connected with the second main controller; the auxiliary controller comprises an auxiliary controller I and an auxiliary controller II, the auxiliary power supply module comprises an auxiliary power supply module I and an auxiliary power supply module II, the auxiliary power supply module I is connected with the auxiliary controller I, and the auxiliary power supply module II is connected with the auxiliary controller II.

4. The hydroelectric generating set water machine protection system of claim 1, wherein: the main data acquisition module, the main signal output module, the auxiliary data acquisition module and the auxiliary signal output module are respectively provided with an independent loop.

5. The hydroelectric generating set water machine protection system of claim 1, wherein: the main data acquisition module and the auxiliary data acquisition module are respectively provided with a switching value signal anti-shake functional unit and an analog value signal quality judgment functional unit.

6. The hydroelectric generating set water machine protection system of claim 1, wherein: the main signal output module and the auxiliary signal output module are both provided with a failure safety function unit.