CN217692685U

CN217692685U - Control system for preventing AGC instruction misoperation

Info

Publication number: CN217692685U
Application number: CN202220006366.XU
Authority: CN
Inventors: 高朋飞
Original assignee: Henan Zhonghe Electric Power Technology Co ltd; Henan Jiuyu Enpai Power Technology Co Ltd
Current assignee: Henan Zhonghe Electric Power Technology Co ltd; Henan Jiuyu Enpai Power Technology Co Ltd
Priority date: 2022-01-04
Filing date: 2022-01-04
Publication date: 2022-10-28
Anticipated expiration: 2032-01-04

Abstract

The utility model provides a prevent control system of AGC instruction malfunction belongs to thermal power unit technical field, and main website AGC system (3) transmit AGC instruction and give RTU device (2), RTU device (2) transmit AGC instruction and give unit side AGC system (1), unit side AGC system (1) includes PC (5), communication device (6) and screen (7), PC (5) are through hard-wired connection screen (7), PC (5) are through communication device (6) interconnection. The utility model provides a current unit itself when AGC instruction malfunction situation enlarged, when guaranteeing generating set's safe operation, compromise generating set in time, correct response AGC instruction's problem.

Description

Control system for preventing AGC instruction misoperation

Technical Field

The utility model belongs to the technical field of the thermal power generating unit technique and specifically relates to a control system who prevents AGC instruction malfunction.

Background

The AGC system of the thermal power generating unit can realize automatic readjustment and distribution of active power output of each generating unit in a control area to maintain the control process of system frequency and tie line exchange power in a planned target range, and is an integral body consisting of an information transmission channel, an information receiving device, a unit coordination control system, an execution device, a generating unit automation device and the like. As the auxiliary logic of the DCS side of the thermal power generating unit after partial production, operation and overhaul is incomplete, AGC interactive signals with the provincial dispatching master station only comprise 3 signals such as an active target value, an active target return value, a load change rate and the like, signals such as an upper limit, a lower limit and a maximum regulating amplitude of an AGC command are not generated, and the DCS side does not have protective logic for keeping the current command such as the bad quality of the AGC command signal and the maximum regulating amplitude.

Chinese patent document CN113098074A discloses a method and a system for diagnosing an AGC instruction abnormality of a photovoltaic power station, where a total station AGC instruction, an AGC instruction received by a regulation and control unit, a total station actual power, and a sum of powers of power conversion units controlled by the regulation and control unit are obtained, and based on a magnitude relation between a total station power instruction value carried in the total station AGC instruction and a total station actual power, any one or more of magnitude relations between a regulation and control unit power instruction value and a power conversion unit power sum are determined, and when an AGC instruction allocated to the regulation and control unit by the total station AGC instruction is abnormal, an alarm information that the AGC instruction is abnormal is output, where the alarm information includes a unique identifier of a device that receives the abnormal AGC instruction. The invention can cover the application scene of the AGC command distributed to the regulation and control unit by diagnosing the problem of abnormal limit power caused by unreasonable distribution of the total station AGC command, and can position the device with the AGC command abnormal and send out warning information. But when the unit is in a fault state, the invention can not make the unit exit the AGC mode.

SUMMERY OF THE UTILITY MODEL

The to-be-solved problem of the utility model is to provide a control system who prevents AGC instruction malfunction, current unit itself is the situation enlarged when solving AGC instruction malfunction, when guaranteeing generating set's safe operation, compromises generating set in time, correctly responds the problem of AGC instruction.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a prevent control system of AGC instruction malfunction, includes unit side AGC system, RTU device and main website AGC system, main website AGC system transmits AGC instruction and gives the RTU device, the RTU device transmits AGC instruction and gives unit side AGC system, unit side AGC system includes PC, communication device and screen, the PC passes through hard-wired connection screen, the PC passes through communication device interconnection.

Preferably, the unit-side AGC system transmits unit operation information to the RTU device, and the RTU device transmits the unit operation information to the master station AGC system.

Preferably, the unit side AGC system transmits a signal to the S terminal of the RS trigger, and a state signal of the unit side input AGC is displayed on a screen.

Preferably, the unit-side AGC system is connected to the RTU device by hard wiring.

Preferably, the unit side AGC system is connected to the master station AGC system through hard wiring.

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

the utility model relates to a control system for preventing AGC instruction misoperation, which guarantees the safe operation of a generator set according to the real-time change of the AGC instruction, and simultaneously gives consideration to the timely and correct response of the generator set to the AGC instruction; once an abnormal condition occurs, sending alarm information while keeping the current AGC instruction, displaying the alarm information on a screen, and reminding an operator to strengthen monitoring; the RTU device can be used for collecting remote measuring and remote signaling data and sending remote control and remote adjusting signals, and provides operation information of the power system for a dispatcher through media such as screen display pictures, reports and the like; the dispatcher is provided with a means to enter control instructions.

The utility model provides a prevent control system of AGC instruction malfunction has and realizes that maneuverability is strong, let the remote regulation signal that master station AGC system issued to the advantage such as the unit side is safe and reliable more, DCS side restriction makes communication network resource save to the unit side on unit side DCS, makes the operation of group safer when thermal power unit drops into the AGC function.

Drawings

Fig. 1 is a schematic structural diagram of a unit-side AGC system according to embodiment 1 of the present invention.

Fig. 2 is a schematic diagram of the system according to embodiment 1 of the present invention.

Fig. 3 is a control diagram for preventing the instruction from being mistakenly sent by the unit side AGC system of embodiment 1 of the present invention.

In the figure, 1-unit side AGC system, 2-RTU device, 3-main station AGC system, 5-PC, 6-communication device, and 7-screen.

Detailed Description

For better understanding of the present invention, the following embodiments and drawings are used to further clarify the content of the present invention, but the protection of the present invention is not limited to the following embodiments. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.

Example 1

Referring to fig. 1, 2 and 3, a control system for preventing an AGC instruction from malfunctioning includes a set-side AGC system 1, an RTU device 2 and a master AGC system 3, where the master AGC system 3 transmits an AGC instruction to the RTU device 2, the RTU device 2 transmits an AGC instruction to the set-side AGC system 1, the set-side AGC system 1 includes a PC 5, a communication device 6 and a screen 7, the PC 5 is connected to the screen 7 through a hard wire, and the PCs 5 are interconnected through the communication device 6.

The system passes through the RTU device: the equipment collects remote measuring and remote signaling data and sends remote control and remote adjusting signals; by the communication device: the medium for information transmission mainly includes microwave communication network and optical fiber communication network. The whole system has the functions of information acquisition and control of the telecontrol device, man-machine conversation and data processing; typically communicating with a master system via a data network.

Further, the unit side AGC system 1 transmits unit operation information to the RTU device 2, and the RTU device 2 transmits the unit operation information to the master station AGC system 3.

Further, the unit side AGC system 1 transmits a signal to the S terminal of the RS trigger, and a state signal for the unit side to engage in AGC is displayed on the screen 7.

Further, the unit-side AGC system 1 is connected to the RTU device 2 by hard wiring.

Further, the unit side AGC system 1 is connected to the master station AGC system 3 through hard wiring.

The utility model relates to a control system for preventing AGC instruction misoperation, which guarantees the safe operation of a generator set according to the real-time change of the AGC instruction, and simultaneously gives consideration to the timely and correct response of the generator set to the AGC instruction; once abnormal conditions occur, the current AGC instruction is kept, meanwhile, alarm information is sent out and displayed on a screen to remind operating personnel to strengthen monitoring, the RTU device can be used for collecting remote measurement and remote signaling data and sending equipment of remote control and remote regulation signals, and the operating information of the power system is provided for a dispatcher through media such as screen display pictures, reports and the like; the dispatcher is provided with a means to enter control instructions.

During operation, the utility model discloses can set up the partial parameter in the logic according to the on-the-spot condition, can set up the parameter and include:

(1) Judging the limit value of the signal of 'the AGC command is inconsistent with the load of the unit', wherein the range can be set to be 5-20 MW, and the typical value is 10MW;

(2) Judging the limiting value of the signal of' rejecting the instruction the more the maximum regulating amplitude is, wherein the limiting value can be set to be 50-100 MW, and the typical value is 50MW;

(3) The limit value of the signal of 'power grid cycle high blocking AGC command increase' is judged and can be set to be 3006r/min, 3003r/min and 3002r/min, and the typical value is 3006r/min;

(4) And the limit value of the signal of 'power grid cycle low latching AGC instruction minus' is judged to be 2994r/min, 2997r/min and 2998r/min, and the typical value is 2994r/min.

The set logic of the AGC load lifting rate at the unit side is mainly used for limiting the response speed of an AGC command at the unit side. The 'unit load rate allowed to rise/fall' signal comes from the load change rate manually set by an operator, is displayed on an operation picture and directly returns to the master station AGC system through hard wiring; the signal of the actual load rate of the unit is from the load change rate manually set by an operator, but if any condition of load blocking increase in a CCS mode, load blocking decrease in the CCS mode and a load instruction GO occurs in the unit, the actual load rate of the unit is set to be 0 and is directly returned to the AGC system of the main station through hard wiring.

The judgment of the AGC instruction increasing load blocking signal not only blocks the misoperation of the unit when the AGC instruction exceeds the upper limit, but also keeps the instruction from AGC to DCS at the current value when the actual load of the unit exceeds the upper limit, the load is blocked and increased in a CCS mode and the cycle wave of a power grid is high, thereby avoiding the situation of the current unit from being expanded;

the judgment of the AGC instruction load reduction blocking signal not only blocks the misoperation of the unit when the AGC instruction exceeds the lower limit, but also keeps the instruction from the AGC to the DCS at the current value when the actual load of the unit exceeds the lower limit, the load is blocked and reduced in a CCS mode and the cycle frequency of a power grid is low, thereby avoiding the situation of the current unit from being enlarged.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited, and other modifications or equivalent replacements made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims

1. A control system for preventing AGC instruction misoperation comprises a unit side AGC system (1), an RTU device (2) and a main station AGC system (3), and is characterized in that the main station AGC system (3) transmits AGC instructions to the RTU device (2), the RTU device (2) transmits AGC instructions to the unit side AGC system (1), the unit side AGC system (1) transmits unit operation information to the RTU device (2), and the RTU device (2) transmits the unit operation information to the main station AGC system (3); the unit side AGC system (1) comprises a PC (5), a communication device (6) and a screen (7), wherein the PC (5) is connected with the screen (7) through a hard wire, the communication device is a microwave communication network or an optical fiber communication network, and the PC (5) and the screen (7) are interconnected through the communication device (6); the AGC system (1) at the unit side transmits a signal to an S end of an RS trigger, and a state signal input into AGC at the unit side is displayed on a screen (7); and the AGC system (1) at the unit side is connected with the RTU device (2) through hard wiring.