CN215772663U

CN215772663U - Active power measurement control device of hydroelectric generating set

Info

Publication number: CN215772663U
Application number: CN202121250159.0U
Authority: CN
Inventors: 张官祥; 马龙; 唐国平
Original assignee: China Yangtze Power Co Ltd
Current assignee: China Yangtze Power Co Ltd
Priority date: 2021-06-06
Filing date: 2021-06-06
Publication date: 2022-02-08
Anticipated expiration: 2031-06-06

Abstract

The utility model provides a hydroelectric set active power measurement control device, including A set of PLC controller and B set of PLC controller, A set of PLC controller and B set of PLC controller input are respectively through A set of power transmitter, B set of power transmitter receives A way PT device, the detected signal of B way PT device, connect through the switch communication between A set of PLC controller and the B set of PLC controller, it has the power collection value to read mutually through Ethernet communication mode A set of PLC controller and B set of PLC controller, the reliability of speed regulator active power measurement has effectively been improved, thereby the control strategy of active power data has further been perfected, the integrality of active power control structure has been improved, can control the speed regulator through the electrical control box, so that reduce on-the-site risk, the effective control accident enlarges.

Description

Active power measurement control device of hydroelectric generating set

Technical Field

The utility model relates to the field of detection and adjustment of a hydraulic generator, in particular to a device for measuring and controlling active power of a hydraulic generator set.

Background

The active power is one of main parameters for regulating and controlling when the water turbine generator set is connected to the grid, and the stability and the reliability of the sampling value directly influence the safe and stable operation of a power grid and the set. In the running process of the unit, if the active power sampling value is unstable, the speed regulator can frequently adjust when tracking the active power in real time; if the difference value between the active power sampling value and the power given value exceeds the threshold value, the speed regulator reports an active power fault alarm, even a serious condition of unit slipping load can occur, and huge loss is brought to a power plant and a power grid. Therefore, the unit active power monitoring is very necessary and requires to be reliable and accurate. The existing system mainly has the following problems:

(1) the LCU is only provided with 1 path of power transmitter, and the acquisition source belongs to a single element. At present, a monitoring system only designs 1 path of power transmitter to collect power, the power is transmitted to a set of controllers A and a set of controllers B of a speed regulator after being processed by a PLC (programmable logic controller), and the collected power is judged to be used as a control parameter or a fault judgment value of the speed regulator respectively through an active power given value and a sampling value. If the monitoring system power transmitter breaks down, the monitoring system and the speed regulator cannot monitor the active power of the unit.

(2) The fault judgment logic of the PLC controller of the speed regulator is single. At present, the controller sets A receive power signals sent by a monitoring system, and the controller sets B only receive power signals sent by the monitoring system. The two sets of controllers cannot communicate with each other for collection, and no third-party data is used for judgment, so that the control strategy is single, the data of the two sets of sensors cannot be fully utilized, the real data collected by the sensors cannot be really judged, and the current faults cannot be really reflected.

Disclosure of Invention

The utility model aims to provide a device for measuring and controlling the active power of the hydroelectric generating set, which ensures that the speed regulator of the hydropower station is stably regulated and controlled, ensures that the active power monitoring of the hydroelectric generating set is accurate and reliable, improves the logic judgment reliability, furthest reduces the loss caused by accidents and protects the personal safety and the asset safety.

In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:

the utility model provides a hydroelectric set active power measurement control device, including A set PLC controller and B set PLC controller, A set PLC controller and B set PLC controller input are respectively through A set power transmitter, B set power transmitter receives A way PT device, the detected signal of B way PT device, connect through the switch communication between A set PLC controller and the B set PLC controller, switch and HMI man-machine interaction screen, local control unit LCU communication connection, the signal of A way PT device and B way PT device real-time detection A way and B way, and turn into the active power analog signal of two ways through A set power transmitter and B set power transmitter, and through A set PLC controller and B set PLC controller, and can realize data interchange through the switch.

The input ends of the A set of PLC and the B set of PLC are electrically connected with the isolation transmitter, the isolation transmitter is electrically connected with the C set of power transmitter, and the input end of the C set of power transmitter is connected with the C-way PT device.

Foretell a set of PLC controller, B set of PLC controller, A set of power transmitter, B set of power transmitter, C set of power transmitter, the switch, HMI human-computer interaction screen and isolation changer are integrated in the electrical control box, HMI human-computer interaction screen is installed on electrical control box shell, still install the digital display table on the electrical control box shell, pilot lamp and button, the digital display table is used for showing the active power numerical value, the pilot lamp is used for showing speed regulator trouble and power transmitter signal, the button is used for controlling the start-up and the stop that the speed regulator adjusted.

The PT signal source of the set A of power transmitters is from a set A of PT devices, and the signals are processed by the set A of power transmitters and then independently sent to an AI module channel of the set A of PLC controllers, namely the signals are the first set A of active power signals and are recorded as PA 1; the PT signal source of the first power transmitter of the B set is from a PT device of the B set, and is independently sent to an AI module channel of the PLC controller of the B set after being calculated by the power transmitter of the B set, namely the signal is a first active power signal of the B set, namely PB 1; the signal source of the C set of power transmitter is from a C-path PT device, after calculation and processing by the C set of power transmitter, the signal is divided into two by a signal isolation transmitter and then respectively transmitted to AI module channels of the A set of PLC controller and the B set of PLC controller, and respectively used as the A set of second active power to be recorded as PA2, and the B set of second active power to be recorded as PB 2; the PLC controllers A, the PLC controllers B and the industrial personal computer respectively carry out data communication through an Ethernet port and a switch, active power signals of the PLC controllers A and the PLC controllers B are mutually output through an Ethernet mode, namely the active power signals collected by the power transmitters A transmitted by the PLC controllers A are sent to the PLC controllers B in a communication mode and serve as a third path of active power B recorded as PB 3; and the B set of PLC controllers transmits active power signals collected by the B set of power transmitter to the A set of PLC controllers in a communication mode, and the active power signals are recorded as PA3 as the A set of third active power. The power module supplies power to the PLC controller A, the PLC controller B, the switch, the industrial personal computer, the indicator lamp, the digital display meter, the isolation transmitter and the power transmitter through hard wiring.

According to the active power measurement control device for the water turbine generator set, signals of the three sets of power transmitters respectively enter the set A of PLC controllers and the set B of PLC controllers, so that the independence of active power acquisition sources of each set of PLC controllers is ensured, the set C of power transmitters enter the two sets of PLC controllers by dividing the isolation transmitters into two parts, and the redundancy of the power transmitters and the active power signal acquisition is improved. Through the communication mode of ethernet A set of PLC controller and B set of PLC controller reads the active power collection value mutually, the reliability of speed regulator active power measurement has effectively been improved, thereby the control strategy of active power data has further been perfected, the integrality of active power control structure has been improved, can control the speed regulator through the electrical control box, so that reduce the on-the-spot risk, the effective control accident enlarges, the industrial computer can look over relevant data and incident record, so that the actual active power value of contrast.

Drawings

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of an electrical control box;

fig. 3 is a schematic diagram of the electrical principle connection of the present invention.

In the figure: a set of PLC controller 1, B set of PLC controller 2, A set of power transmitter 3, B set of power transmitter 4, C set of power transmitter 5, switch 6, HMI human-computer interaction screen 7, power conversion module 8, local control unit LCU9, path A PT device 10, path C PT device 11, path B PT device 12, digital display meter 13, indicator light 14, button 15, heat dissipation hole 16, electrical control box 17, terminal row 18 and isolation transmitter 19.

Detailed Description

As shown in fig. 1-3, an active power measurement control device of a water turbine generator set comprises a set of PLC controller 1 and a set of PLC controller 2, wherein input ends of the set of PLC controller 1 and the set of PLC controller 2 respectively receive detection signals of a path PT device 10 and a path PT device 12 through a set of power transmitter 3 and a set of power transmitter 4, the set of PLC controller 1 and the set of PLC controller 2 are in communication connection through a switch 6, the switch 6 is in communication connection with an HMI man-machine interaction screen 7 and a local control unit LCU9, the set of PT device 10 and the path PT device 12 detect signals of the path a and the path B in real time, and converted into two paths of active power analog quantity signals through the A set of power transmitter 3 and the B set of power transmitter 4, and data exchange can be realized through the A set of PLC controllers 1 and the B set of PLC controllers 2 and the exchanger 6.

The input ends of the

PLC controllers

1 and 2 are electrically connected with the isolation transmitter 19, the isolation transmitter 19 is electrically connected with the power transmitter 5, and the input end of the power transmitter 5 is connected with the PT device 11.

The A set of PLC controller 1, the B set of PLC controller 2, the A set of power transmitter 3, the B set of power transmitter 4, the C set of power transmitter 5, the switch 6, the HMI human-computer interaction screen 7 and the isolation transmitter 19 are integrated in the electrical control box 17, the HMI human-computer interaction screen 7 is installed on the shell of the electrical control box 17, a digital display meter 13, an indicator lamp 14 and a button 15 are further installed on the shell of the electrical control box 17, the digital display meter 13 is used for displaying an active power numerical value, the indicator lamp 14 is used for displaying a fault of the speed regulator and a signal of the power transmitter, and the button 15 is used for controlling the starting and stopping of the regulation of the speed regulator.

The working principle of the utility model is as follows:

the power supply conversion module 8 supplies all equipment in the device with DC24V power, the device can work normally, and the device can not work when the power supply of the device is cut off, but current collected data are reserved. When the unit is in grid-connected power generation operation, the three sets of power transmitters collect and process a PT device signal source in real time and send the signal source to the PLC, and the main PLC analyzes and processes the collected three paths of active power signals;

the specific processing logic is as follows:

when the three active power signals have faults randomly when the unit is connected to the grid, the analog quantity signals collected by the A set of power transmitter 3, the B set of power transmitter 4 and the C set of power transmitter 5 are preferentially adopted in sequence when the A set of power transmitter 3, the B set of power transmitter 4 and the C set of power transmitter 5 are judged to have no faults. When the three active power signals are not in fault when the unit is connected to the grid, the three active power signals are compared with each other by difference values and absolute values are obtained, and when the difference values of the three sets of power transmitters are smaller than a set threshold value, analog quantity signals collected by the power transmitter without the fault are collected preferentially in sequence, wherein the judgment sequence of the analog quantity signals is set as A set of power transmitter 3, B set of power transmitter 4 and C set of power transmitter 5;

when the three active power signals are not faulty when the unit is connected to the grid, comparing the difference values of the three active power signals, and taking an absolute value, judging the power transmitter with a fault signal when the difference values of the three sets of power transmitters are all larger than a set threshold value, and preferentially collecting the signal of the fault-free power transmitter in turn, wherein the judgment sequence is A set of power transmitter, B set of power transmitter and C set of power transmitter;

according to the data processing logic of the main PLC, an active power fault signal outputs a control command and a fault state signal to an indicator lamp and an HMI through a DO module, an analog quantity of the active power signal is output to the HMI and a digital display instrument through an AO module, and the analog quantity is sent to an LCU (local control Unit) through a communication mode.

The specific use method is as follows:

firstly, an external power supply is connected to a terminal block, a power supply conversion module converts the output of the power supply into a DC24V power supply to supply power to equipment in an electrical control box, and a power supply indicator light of an indicator light of the electrical control box is lightened;

and secondly, when the device normally operates, the main PLC controller preferentially collects and outputs active power signals. The three sets of power transmitters acquire active power signals in real time and transmit the active power signals to AI modules of the set A and the set B of PLC controllers, the PLC controllers output the active power signals to the industrial personal computer and the digital display instrument through the AO modules to display the active power signals acquired by the set A of power transmitters, the active power signals acquired by the set B of power transmitters and the active power signals acquired by the set C of power transmitters in real time, and output fault signals of the power transmitters and fault signals of the PLC controllers through the DO modules of the PLC controllers; the industrial personal computer records the event record and the fault record of the equipment in real time; when the sampling values of three sets of power transmitters collected by the main PLC exceed a set threshold value, the device sends out active power fault signals of the speed regulator, displays fault alarm signal indication on an industrial personal computer and an indicator lamp and switches to a standby PLC;

and thirdly, when the device sends an active power signal fault, the main PLC controller is switched to the standby PLC controller, the standby controller collects the active power signal in real time, and the standby PLC controller controls logic judgment and execution according to the second step and the working principle.

Claims

1. The utility model provides a hydroelectric set active power measurement controlling means which characterized by: comprises a set of PLC controller (1) and a set of PLC controller (2) B, wherein the input ends of the set of PLC controller (1) and the set of PLC controller (2) B respectively receive the detection signals of a path PT device (10) and a path PT device (12) A through a set of power transmitter (3) A and a set of power transmitter (4) B, the set of PLC controller (1) A and the set of PLC controller (2) B are in communication connection through a switch (6), the switch (6) is in communication connection with an HMI (human machine interface) screen (7) and a Local Control Unit (LCU) (9), the set of PLC controller (1) A and the set of PLC controller (2) B detect the signals of the path A and the path B in real time, and the signals are converted into two paths of active power analog quantity signals through the A set of power transmitter (3) and the B set of power transmitter (4), and data exchange can be realized through the A set of PLC controllers (1) and the B set of PLC controllers (2) and the exchanger (6).

2. The active power measurement and control device of the water turbine generator set according to claim 1, characterized in that the input ends of the PLC controllers (1) and (2) are electrically connected with the isolation transmitter (19), the isolation transmitter (19) is electrically connected with the power transmitter (5) in the C set, and the input end of the power transmitter (5) in the C set is connected with the PT device (11) in the C path.

3. The active power measurement control device of the water turbine generator set according to claim 1, characterized in that the A set of PLC controller (1), the B set of PLC controller (2), the A set of power transmitter (3), the B set of power transmitter (4), the C set of power transmitter (5), the switch (6), the HMI man-machine interaction screen (7) and the isolation transmitter (19) are integrated in the electrical control box (17), the HMI man-machine interaction screen (7) is installed on the shell of the electrical control box (17), the shell of the electrical control box (17) is further provided with a digital display meter (13), an indicator lamp (14) and a button (15), the digital display meter (13) is used for displaying an active power value, the indicator lamp (14) is used for displaying a fault and a power transmitter signal, and the button (15) is used for controlling the start and stop of the speed regulator.