CN106026370B - A kind of 110kV transforming plant DC power-supply system stand-by provisions based on PLC - Google Patents

A kind of 110kV transforming plant DC power-supply system stand-by provisions based on PLC Download PDF

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Publication number
CN106026370B
CN106026370B CN201610601346.6A CN201610601346A CN106026370B CN 106026370 B CN106026370 B CN 106026370B CN 201610601346 A CN201610601346 A CN 201610601346A CN 106026370 B CN106026370 B CN 106026370B
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China
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power supply
signal
plc
current
programmable controller
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CN201610601346.6A
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CN106026370A (en
Inventor
张昌
吴景
田野
胡晓燕
任尚伟
刘朋蓓
任志帅
王凯
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State Grid Corp of China SGCC
Dongying Power Supply Co of State Grid Shandong Electric Power Co Ltd
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State Grid Corp of China SGCC
Dongying Power Supply Co of State Grid Shandong Electric Power Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Safety Devices In Control Systems (AREA)

Abstract

The invention discloses a kind of 110kV transforming plant DC power-supply system stand-by provisions based on PLC, and including PLC programmable controller, 24V direct-current switch power supplies, auxiliary relay K1, K2,24V direct-current switch power supplies provide working power for PLC programmable controller;When standing active and standby DC charging motor total failure or accumulator group terminal voltage being caused to decline due to centralized monitor work condition abnormality, the DC power supply output in station on experiment power supply screen can be connected with direct current closing bus bar in station automatically for the device, there is provided emergency power charge power supply and on send accident alarm signal to main website and substation background computer, urgent defect elimination measure is taken to strive for the quality time for O&M service personnel.

Description

A kind of 110kV transforming plant DC power-supply system stand-by provisions based on PLC
Technical field
The present invention relates to power supply technique field more particularly to a kind of 110kV transforming plant DC power supplys systems based on PLC System stand-by provision.
Background technology
In view of in substation all kinds of DC loads importance, the global reliability and stability of transformer station direct current system are just It is natural to become the primary premise for ensureing full station equipment safe operation.
Important component of the DC charging module as straight-flow system, effect is to be converted to three-phase alternating current to meet On the one hand the controllable direct current of battery charging characteristic carries out accumulator group floating charging and provides output of closing a floodgate, on the other hand Control mother is connected to by pressure unit, normal operating current is provided for load.
Centralized monitor is typically mounted on DC power supply panel, is responsible for carrying out the operating status of straight-flow system each unit complete The monitoring and control in face.The original intention of setting substation experiment power supply screen be for station equipment electrical test provide exchange 380V, 220V and the electrodeless adjustable DC power supply in certain output voltage range.
Although requirement of the straight-flow system to charging module is the warm standby mode work with N+1 redundancies, it is contemplated that portion Equipment operating environment is severe in point substation and the unfavorable factors such as ageing equipment, even if prior art has contemplated that redundancy, but It is not perfectly safe.In addition, once centralized monitor failure, out of hand to each DC charging motor, if at this point, just having charging mould Block breaks down, and the danger of straight-flow system dead electricity will also greatly increase.
The current defect elimination means for DC charging module and centralized monitor failure usually first look into circuit, and no problem is again Look into hardware, if it is determined that be that charging module or the damage of device plate then must promptly coordinate standby redundancy and carry out replacement processing.Nothing By which kind of above-mentioned method, it all can inevitably make straight-flow system within some period (depending on the time short-sighted defect elimination of length takes) Accumulator group temporary support can only be leaned on, if last one of barrier is out of order again, by dead electricity, consequence can't bear to set whole station DC load Think.
Invention content
The present invention singly covers DC power system operation risk for 110kV substations, has developed a kind of power transformation based on PLC It stands DC power supply system reserve device.
Technical scheme is as follows:
A kind of 110kV transforming plant DC power-supply system stand-by provisions based on PLC, including PLC programmable controller, 24V Direct-current switch power supply, auxiliary relay K1, K2,24V direct-current switch power supplies provide working power for PLC programmable controller;PLC The public observing and controlling screen of input terminal R1 connections of programmable controller, the hard contact letter of acquisition direct current Centralized Controller device exception Number, the RS485 PORT COMs of PLC programmable controller connect acquisition with DC charging module RS485 buses and include currently respectively filling The output current of electric module, the terminal voltage of accumulator group, the real-time current in spare charge power supply circuit, all active and standby direct currents fill Hard contact point signal, all active and standby direct currents of amount including the fault-signal of electric module, wherein direct current Centralized Controller device exception The fault-signal of charging module is switching value;The output current of current each charging module, the terminal voltage of accumulator group, spare charging The real-time current of electric power loop is analog quantity;Within a complete work period, PLC reads in above-mentioned institute with scan mode successively There are switching value, analog quantity, a wheel logical operation is completed based on default workflow, the result according to logical operation refreshes PLC The amount of outputing of programmable controller;Auxiliary relay K1, K2 are controlled by PLC programmable controller, and auxiliary relay K1 controls are normal Open the break-make of contact K11, K12, normal opened contact K11, K12 difference joint test power supply DC terminal and accumulator group busbar positive electricity And negative electricity, the break-make of auxiliary relay K2 control normal opened contacts K21, normal opened contact K21 are connected to public observing and controlling screen spare terminal, For uploading a hard contact point signal to public observing and controlling screen, signal name is:DC charging system failure, standby power supply device are thrown Enter;When the active and standby DC charging motor total failure in station or since centralized monitor work condition abnormality causes accumulator group terminal voltage to decline When (accumulator group free band whole station load, the inevitable outcome of continuous discharge), which can automatically will be in station on experiment power supply screen DC power supply output with stand in direct current closing bus bar be connected, provide emergency power charge power supply and on send accident alarm signal extremely Main website and substation background computer take urgent defect elimination measure to strive for the quality time for O&M service personnel..
The 110kV transforming plant DC power-supply system stand-by provisions, the action logic of PLC programmable controller are set as Following all signals with door:Direct current Centralized Controller device input enabling signal extremely, all active and standby DC charging modules events Barrier input enabling signal, each charging module output current are 0 input enabling signal, and the terminal voltage of accumulator group is less than float charge voltage Minimum Acceptable Value input enabling signal;When above-mentioned enabling signal is quoted simultaneously within a sampling period, PLC PLC technologies Device output action signal, makes spare charge power supply devote oneself to work;Otherwise PLC programmable controller is reliably failure to actuate, prevent due to Indivedual enabling signal wrong reports cause spare charge power supply to miscarry, and cause string electricity occurs between multichannel power of alterating and direct current;Spare charging Electric power loop conducting after, PLC programmable controller will the circuit charging current data by 485 communications protocol it is real-time on give To host computer.
The return logic of PLC programmable controller is or door:The terminal voltage of accumulator group is defeated higher than its float charge voltage limit value Enter return signal, circuit output current is more than floating current limit value and inputs return signal, when above-mentioned signal has the either signal to send out The device should be returned reliably;
When PLC outputs action signal, auxiliary relay action can be directly driven, to be closed its corresponding normal opened contact. The present apparatus has matched the normal opened contact of two groups of auxiliary relay K1, K2, wherein auxiliary relay K1 with self-retaining function altogether K11, K12 are used for realizing the opening into conducting of experiment power supply screen DC power supply, and the wherein normal opened contact K21 of auxiliary relay K2 is used for On send a hard contact point signal to public observing and controlling screen, signal name is:DC charging system failure, standby power supply device input;
When meeting PLC return signals, auxiliary relay K1, K2 should be returned reliably, open test power supply DC terminal, be stopped Charging.
The advantage of the invention is that 110kV substations singly set DC power system can be greatly improved by adding the present apparatus Reliability and stability.Such as DC charging module total failure particularly occurs in straight-flow system, accumulator group loses charging It during the emergency of power supply etc, can accurately put into rapidly, help to maintain the terminal voltage of accumulator group, people is overhauled for O&M Member takes urgent defect elimination measure to strive for valuable time.
Description of the drawings
Fig. 1 is the device of the invention principle schematic;
Fig. 2 is user program action logic of the present invention;
Fig. 3 returns to logic for user program of the present invention;
Specific embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
By selecting ripe industrial automation PLC programmable controller (Siemens S7-300 PLC), the realization present apparatus Acquisition, operation and execution.Its structure is as shown in Figure 1, straight including PLC programmable controller (Siemens S7-300 PLC), 24V Current switching power supply, 24V direct-current switch power supplies provide working power for PLC programmable controller;The input of PLC programmable controller The public observing and controlling screen of terminal R1 connections, the hard contact point signal of acquisition direct current Centralized Controller device abnormal (failure), PLC programmable controls The RS485 PORT COMs of device processed are connect with DC charging module RS485 buses;PLC programmable controller controls auxiliary relay K1, K2, auxiliary relay K1 control K11, K12 normal opened contact break-make, K11, K12 difference joint test power supply DC terminal and Accumulator group busbar positive electricity and negative electricity, the break-make of auxiliary relay K2 control normal opened contacts K21, connect as a hard contact point signal It is connected on public observing and controlling screen.
Gatherer process:
Existing switching value, also there is analog quantity in PLC intakes.Switching value mainly includes:1st, direct current Centralized Controller device The hard contact point signal (being derived from public observing and controlling screen) of abnormal (failure);2nd, the fault-signal (PLC of all active and standby DC charging modules Included RS485 communication functions, can directly be adopted from 485 buses of DC charging module into).Analog quantity is (from DC charging module 485 buses on adopt into) mainly include:1st, the output current of current each charging module;2nd, the terminal voltage of accumulator group;3rd, it is spare The real-time current in charge power supply circuit etc..
Within a complete work period, PLC reads in above-mentioned all intakes with scan mode successively, then, is based on Workflow (i.e. ladder diagram) is preset to complete a wheel logical operation, the result according to logical operation refreshes PLC PLC technologies The amount of outputing of device.
Calculating process:
The action logic (as shown in Figure 2) of PLC programmable controller be set as following all signals with door:Direct current is concentrated Control device input enabling signal extremely, all active and standby DC charging module failure input enabling signals, each charging module are defeated Go out electric current for 0 input enabling signal, the terminal voltage of accumulator group inputs enabling signal less than the Minimum Acceptable Value of float charge voltage.On Enabling signal is stated within a sampling period while when quoting, PLC programmable controller output action signal makes spare charging electricity It devotes oneself to work in source;Otherwise PLC programmable controller is reliably failure to actuate, and prevents from causing spare charging due to the wrong report of indivedual enabling signals Power supply miscarries, and causes string electricity occurs between multichannel power of alterating and direct current.After spare charge power supply circuit conducting, PLC device is in itself By the charging current data in the circuit by 485 communications protocol it is real-time on give host computer;
The return logic of PLC programmable controller is or door:The terminal voltage of accumulator group is defeated higher than its float charge voltage limit value Enter return signal, circuit output current is more than floating current limit value and inputs return signal, when above-mentioned signal has the either signal to send out The device should be returned reliably;
When PLC programmable controller is when outputing action signal, auxiliary relay action can be directly driven, to be closed its phase The normal opened contact answered;Normal opened contact K11, K12 of auxiliary relay K1 is used for realizing the opening into conducting of experiment power supply DC power supply, The normal opened contact K21 of auxiliary relay K2 is used for uploading a hard contact point signal to public observing and controlling screen, and signal name is:DC charging The system failure, standby power supply device input;
When meeting PLC return signals, auxiliary relay K1, K2 should be returned reliably, open test power supply DC terminal, be stopped Charging;
The device need not independent group screen, can nearby be mounted on DC power supply panel on, with the signal contact between public observing and controlling It is realized using the spare core of original cable on screen cabinet, only needs one, new clothes from experiment power supply screen to the electric power of DC charging screen electricity Cable.
It should be understood that for those of ordinary skills, can be improved or converted according to the above description, And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.

Claims (2)

1. a kind of 110kV transforming plant DC power-supply system stand-by provisions based on PLC, which is characterized in that including PLC programmable controls Device processed, 24V direct-current switch power supplies, auxiliary relay K1, K2,24V direct-current switch power supplies provide work for PLC programmable controller Power supply;The public observing and controlling screen of input terminal R1 connections of PLC programmable controller acquires the hard of direct current Centralized Controller device exception Contact point signal, the RS485 PORT COMs of PLC programmable controller connect acquisition with DC charging module RS485 buses and include working as The output current of preceding each charging module, the terminal voltage of accumulator group, spare charge power supply circuit real-time current, all active and standby The hard contact point signal of amount including the fault-signal of DC charging module, wherein direct current Centralized Controller device exception, Suo Youzhu, The fault-signal of standby DC charging module is switching value;It is the output current of current each charging module, the terminal voltage of accumulator group, standby Real-time current with charge power supply circuit is analog quantity;Within a complete work period, PLC is read in successively with scan mode Above-mentioned all switching values, analog quantity complete a wheel logical operation, the result brush according to logical operation based on default workflow The amount of outputing of new PLC programmable controller;Auxiliary relay K1, K2 are controlled by PLC programmable controller, auxiliary relay K1 controls The break-make of normal opened contact K11, K12 processed, normal opened contact K11, K12 difference joint test power supply DC terminal and accumulator group busbar Positive electricity and negative electricity, the break-make of auxiliary relay K2 control normal opened contacts K21, it is spare that normal opened contact K21 is connected to public observing and controlling screen Terminal, for uploading a hard contact point signal to public observing and controlling screen, signal name is:DC charging system failure, stand-by power supply dress Put input;When the active and standby DC charging motor total failure in station or since centralized monitor work condition abnormality leads to accumulator group terminal voltage During decline, which the DC power supply output in station on experiment power supply screen can be connected with direct current closing bus bar in station automatically, carry For emergency power charge power supply and on send accident alarm signal to main website and substation background computer.
2. 110kV transforming plant DCs power-supply system stand-by provision according to claim 1, which is characterized in that PLC may be programmed The action logic of controller be set as following all signals with door:Direct current Centralized Controller device input enabling signal extremely, All active and standby DC charging module failure input enabling signals, each charging module output current input enabling signal, electric power storage for 0 The terminal voltage of pond group is less than the Minimum Acceptable Value input enabling signal of float charge voltage;Above-mentioned enabling signal is within a sampling period When quoting simultaneously, PLC programmable controller output action signal makes spare charge power supply devote oneself to work;Otherwise PLC programmable controls Device processed is reliably failure to actuate, and is prevented from spare charge power supply being caused to miscarry due to the wrong report of indivedual enabling signals, is caused multichannel alterating and direct current String electricity occurs between source;After the conducting of spare charge power supply circuit, PLC programmable controller will the circuit charging current data By 485 communications protocol it is real-time on give host computer;
The return logic of PLC programmable controller is or door:The terminal voltage of accumulator group is returned higher than the input of its float charge voltage limit value It writes in reply number, circuit output current is more than floating current limit value and inputs return signal, dress when above-mentioned signal has the either signal to send out Putting reliably to return;
When PLC outputs action signal, auxiliary relay action can be directly driven, to be closed its corresponding normal opened contact;Choosing altogether Two groups of auxiliary relay K1, K2 with self-retaining function are matched, wherein normal opened contact K11, K12 of auxiliary relay K1 is used for real Existing experiment power supply screen DC power supply is opened into conducting, and the wherein normal opened contact K21 of auxiliary relay K2 is used for above sending a hard contact Signal gives public observing and controlling screen, and signal name is:DC charging system failure, standby power supply device input;
When meeting PLC return signals, auxiliary relay K1, K2 should be returned reliably, and open test power supply DC terminal stops filling Electricity.
CN201610601346.6A 2016-07-27 2016-07-27 A kind of 110kV transforming plant DC power-supply system stand-by provisions based on PLC Active CN106026370B (en)

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CN109298276B (en) * 2018-11-09 2020-08-14 洛阳点晶智控科技有限公司 Method for judging and detecting on-off of circuit loop in PLC (programmable logic controller)
CN115898829A (en) * 2022-11-04 2023-04-04 中国电力工程顾问集团中南电力设计院有限公司 CAES system shared by modularly configured heat exchange systems and use method

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CN101872999A (en) * 2010-07-07 2010-10-27 宁夏电力公司吴忠供电局 Low-voltage alternating current power supply programmable switching system of substation
CN202150641U (en) * 2011-07-27 2012-02-22 上海凯华电源成套设备有限公司 Integrated screen sharing AC distribution board and monitoring device
CN202167860U (en) * 2011-07-15 2012-03-14 珠海银通新能源有限公司 Intelligent energy storage machine
CN102882237A (en) * 2011-07-15 2013-01-16 珠海银通新能源有限公司 Intelligent energy storage machine and operating method thereof
CN203326704U (en) * 2013-06-24 2013-12-04 连云港市港圣开关制造有限公司 Backup power supply automatic switching apparatus
CN103887873A (en) * 2014-03-12 2014-06-25 国家电网公司 Power supply standby device for transformer substation achieved based on PLC

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101872999A (en) * 2010-07-07 2010-10-27 宁夏电力公司吴忠供电局 Low-voltage alternating current power supply programmable switching system of substation
CN202167860U (en) * 2011-07-15 2012-03-14 珠海银通新能源有限公司 Intelligent energy storage machine
CN102882237A (en) * 2011-07-15 2013-01-16 珠海银通新能源有限公司 Intelligent energy storage machine and operating method thereof
CN202150641U (en) * 2011-07-27 2012-02-22 上海凯华电源成套设备有限公司 Integrated screen sharing AC distribution board and monitoring device
CN203326704U (en) * 2013-06-24 2013-12-04 连云港市港圣开关制造有限公司 Backup power supply automatic switching apparatus
CN103887873A (en) * 2014-03-12 2014-06-25 国家电网公司 Power supply standby device for transformer substation achieved based on PLC

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