CN217212907U - Main transformer high-voltage side output power real-time calculation system based on double-bus switching - Google Patents

Abstract

The utility model provides a real-time calculation system of main transformer high-voltage side output power based on double-bus switching, including female I, female II and a plurality of generating set, the generating set connects female I, female II respectively after connecting the main transformer, be equipped with I switch, II switch respectively between female I, female II of main transformer, the main transformer side is equipped with current transformer CT, female I, female II are equipped with voltage transformer PTI, voltage transformer PTII respectively, still include UC630 full-synchronization measurement and control device, telemechanical host and dispatch data network, the AC module of UC630 full-synchronization measurement and control device links to each other with current transformer CT and voltage transformer PTI, voltage transformer PTII, the DI module of UC630 full-synchronization measurement and control device links to each other with I switch and II switch position auxiliary node signal, UC630 full-synchronization measurement and control device links to each other through network switch and telemechanical host, telemechanical host communicates with dispatch data network through the net, the utility model discloses can utilize the accurate fast calculation of PT equipment on the current generating line to obtain the output that the unit owner becomes the high-pressure side.

Description

Main transformer high-voltage side output power real-time calculation system based on double-bus switching

Technical Field

The utility model relates to a power plant output calculates the field, especially relates to a main real-time computing system of high-pressure side output that becomes based on double bus switches.

Background

At present, many power plants in China adopt a double-bus system, as shown in fig. 1, a set of PT equipment is arranged on each bus hooked on the high-voltage side of a main transformer of a unit, and can reflect the PT values of the buses and the high-voltage side of the unit connected with the buses, the high-voltage side of the main transformer is only provided with respective CT equipment, and the PT equipment is not separately configured, so that the output power of the high-voltage side of the main transformer of each unit cannot be acquired through normal CT and PT secondary circuit acquisition and calculation.

There are two conventional solutions: 1. respectively configuring a set of PT equipment on a primary loop at the high-voltage side of a main transformer of each unit, and acquiring and calculating active power and reactive power at the high-voltage side of the main transformer through conventional CT and PT secondary loops; 2. and a set of bus voltage switching device is additionally arranged to output the judged PT value for each unit. Through analysis, the method for adding multiple sets of PT equipment on the high-voltage side of the main transformer of the unit in the scheme 1 has high cost and long period, and can be implemented only when the unit is stopped, but the unit of a power plant cannot be disconnected and stopped for a long time, and the construction condition is tense; in the scheme 2, a new set of bus voltage switching device is high in cost and long in cycle, so that the condition that the power of the high-voltage side of a main transformer cannot be transmitted to the dispatching center for a long time can be caused, and the requirement of the dispatching center cannot be met.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the utility model provides a main change high-pressure side output power real-time computation system based on two generating lines switch, can utilize the accurate quick calculation of PT equipment on the current generating line to obtain the output power of unit main change high-pressure side.

In order to realize the purpose, the utility model discloses a technical scheme is: a real-time calculation system for output power of a main transformer on a high-voltage side based on double-bus switching comprises a I bus, a II bus and a plurality of generator sets, wherein the generator sets are respectively connected with the I bus and the II bus after being connected with a main transformer, an I disconnecting link and an II disconnecting link are respectively arranged between the main transformer and the I bus and between the main transformer and the II bus, the high-voltage side of the main transformer is provided with a current transformer CT for detecting the passing current of the main transformer, the I bus and the II bus are respectively provided with a voltage transformer PTI and a voltage transformer PTII for detecting the passing voltage of the main transformer, the system also comprises a UC630 fully synchronous measurement and control device, a telemechanical host and a scheduling data network, an AC module of the UC630 fully synchronous measurement and control device is connected with the current transformer CT, the voltage transformer PTI and the voltage transformer PTII, a DI module of the UC630 fully synchronous measurement and control device is connected with signals of the I disconnecting link and the position auxiliary node of the II disconnecting link, the UC630 full-synchronous measurement and control device acquires position signals of a disconnecting link I and a disconnecting link II, the UC630 full-synchronous measurement and control device is connected with a telecontrol host through a network switch, and the telecontrol host is communicated with a dispatching data network through a network cable.

Preferably, the power distribution system further comprises a monitoring terminal communicated with the telemechanical host through a network cable, and the monitoring terminal displays the real-time output power of the high-voltage side of each main transformer.

According to the technical scheme, the beneficial effects of the utility model are that:

the system acquires the opening and closing positions of the disconnecting link I and the disconnecting link II, performs logic judgment to obtain the voltage value of the main voltage transformation side of the unit which is detected by the PT equipment on the bus, and accurately and quickly calculates the output power of the main voltage transformation side of the unit according to the CT equipment on the main transformer side, so that the cost of newly adding a PT or voltage switching device is saved, the problem of data jumping caused by the single PT multi-CT software linkage relation is avoided, and the overall stability of the operation of a power grid is ensured.

Drawings

FIG. 1 is a prior art circuit diagram of the present invention;

fig. 2 is a schematic diagram of the working process of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The utility model provides a main transformer high-voltage side output power real-time calculation system based on double bus switches, includes that I is female, II is female and a plurality of generating set, and generating set connects I mother, II mother respectively after connecting main transformer, is equipped with I switch, II switch respectively between main transformer and I mother, II mother, and main transformer high-voltage side is equipped with detects its current transformer CT that passes through the electric current, is equipped with respectively on I mother, II mother and detects its voltage transformer PTI, the voltage transformer PTII who passes through the electric voltage.

As shown in fig. 2, the system further includes a UC630 full-synchronization measurement and control device, a telecontrol host, a dispatch data network, and a monitoring terminal, wherein an AC module of the UC630 full-synchronization measurement and control device is connected to a current transformer CT, a voltage transformer PTI, and a voltage transformer PTII, a DI module of the UC630 full-synchronization measurement and control device is connected to auxiliary node signals at knife switch I and knife switch ii positions, the UC630 full-synchronization measurement and control device is connected to the telecontrol host through a network switch, and the telecontrol host is connected to the dispatch data network and the monitoring terminal through a network cable.

The UC630 full-synchronous measurement and control device acquires data information of a current transformer CT and a voltage transformer PTI, a voltage transformer PTII and position signals of a disconnecting link I and a disconnecting link II which are switched on and off; the telecontrol host machine carries out logic judgment on position signals of a disconnecting link I and a disconnecting link II which are collected by the UC630 full-synchronous measurement and control device, and calculates the real-time output power of the high-voltage side of each main transformer according to the collected data information of a current transformer CT, a voltage transformer PTI and a voltage transformer PTII; the dispatching data network transmits the real-time output power of the high-voltage side of each main transformer to the dispatching center in real time, so that the remote measuring and remote signaling information of the power plant can be conveniently sent to the dispatching center in real time, the running conditions of the power grid and the power plant can be monitored, the dispatching center can timely issue running remote dispatching instructions, and the dispatching automation is realized; the monitoring terminal displays the real-time output power of the high-voltage side of each main transformer for the personnel in the power plant, and the monitoring terminal selects the GS100+ INT monitoring terminal in the actual work.

The telemechanical main unit is used for acquiring position signals of an I disconnecting link and an II disconnecting link according to the DI module, assuming that a node signal of the position of the I disconnecting link is DI1 and a node signal of the position of the II disconnecting link is DI2, when the I disconnecting link is switched on, DI1 is 1, and when the I disconnecting link is switched off, DI1 is 0; and II, the DI2 is equal to 1 when the knife switch is closed, and the DI2 is equal to 0 when the knife switch is opened.

Firstly, judging position node signals of the disconnecting link I and the disconnecting link II, and when DI1 is equal to 1 and DI2 is equal to 0, namely, the high-voltage side of a main transformer of the unit is connected to the I bus in a hanging mode; and then, judging whether the voltage value of the voltage transformer PTI is equal to 0 or not, wherein PTI is not equal to 0, indicating that the voltage transformer PTI normally operates, and directly calculating and outputting a power value P1 of the high-voltage side of the main transformer of the unit on the I bus at the moment.

If the PTI is equal to 0, the PTI is shut down for maintenance, and the PTI cannot normally reflect the I parent voltage at the moment. However, according to the operation requirement, before the voltage transformer PTI is shut down, the I bus and the II bus need to be connected to operate, the I bus voltage is equal to the II bus voltage, the PT II can reflect the II bus voltage and represent the I bus voltage, and the P2 calculated by the CT at the high-voltage side of the main transformer of the unit and the PT II bus at the moment is directly calculated and output as the output power of the high-voltage side of the main transformer of the unit.

If DI1 is equal to 0 and DI2 is equal to 1, that is, the high-pressure side of the main unit is connected to the secondary unit, and the determination process is the same as above.

When the high-voltage side of the unit is switched over on the double buses (when the unit is switched over from the originally hooked bus to the leading bus), a situation that the main transformer high-voltage side disconnecting link of the short-time internal unit is simultaneously hooked on the two buses can occur, namely, the II disconnecting link and the I disconnecting link are simultaneously closed (DI2 is 1 and DI1 is 1), and at the moment, an error can be reported in the software output process. To avoid this, the system makes the following settings: the software saves the DI1 and DI2 states for the last sampling period (time t-1) each time it collects the DI1 and DI2 states. When the system has DI1 and DI2 being 1 at the same time, the states of DI1 and DI2 at t-1 are automatically judged.

If t-1 is carried out, DI1 is equal to 0, which represents that the disconnecting link of the unit I is changed from the disconnecting link at the t-1 moment to the switching link at the t moment, namely the current switching operation is that the unit is switched from the mother II to the mother I, namely the target bus is the mother I, and the current power value P1 of the unit on the mother I is output;

if the t-1 time is reached, DI2 is equal to 0, which represents that the switch-off position of the unit ii switch from the time t-1 is changed into the switch-on position of the time t, that is, the current switching operation is that the unit is switched from the i bus to the ii bus, that is, the target bus is the ii bus, and then the current power value P2 of the unit on the ii bus is output.

It should be noted that the above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments, and any simple modification, equivalent change and modification made to the above embodiments by the technical essence of the present invention all fall into the protection scope of the present invention.

Claims (2)

1. The utility model provides a main transformer high-voltage side output power real-time calculation system based on two generating lines switch, it is female including I, II is female and a plurality of generating set, it is female to connect I respectively after generating set connects main transformer, II is female, main transformer and I are female, II are female between be equipped with I switch respectively, II switches, main transformer high-voltage side is equipped with the current transformer CT that detects its through-current, I is female, II is female to be equipped with the voltage transformer PTI that detects its through-voltage respectively, voltage transformer PTII, its characterized in that: still include UC630 full-synchronization measurement and control device, telemechanical host computer and dispatch data network, UC630 full-synchronization measurement and control device's AC module links to each other with current transformer CT and voltage transformer PTI, voltage transformer PTII, UC630 full-synchronization measurement and control device gathers current transformer CT and voltage transformer PTI, voltage transformer PTII data information, UC630 full-synchronization measurement and control device's DI module links to each other with I switch and II switch position auxiliary node signal, UC630 full-synchronization measurement and control device gathers the position signal of I switch and II switch divide-shut brake, UC630 full-synchronization measurement and control device passes through network switch and telemechanical host computer and links to each other, telemechanical host computer passes through the net twine and communicates with the dispatch data network.

2. The system according to claim 1, wherein the real-time calculation system for the output power of the high-voltage side of the main transformer based on the double-bus switching comprises: the monitoring terminal is communicated with the telemechanical host through a network cable and displays real-time output power of the high-voltage side of each main transformer.

Images