CN103746304A - Reconstruction method of intelligent transformer station - Google Patents
Reconstruction method of intelligent transformer station Download PDFInfo
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- CN103746304A CN103746304A CN201310726673.0A CN201310726673A CN103746304A CN 103746304 A CN103746304 A CN 103746304A CN 201310726673 A CN201310726673 A CN 201310726673A CN 103746304 A CN103746304 A CN 103746304A
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Abstract
The invention discloses a reconstruction method of an intelligent transformer station, for solving the technical problem that a bus maintains protective operation during the reconstruction period of the intelligent transformer station. The method provided by the invention comprises the following steps: connecting the secondary cables of conventional transformer station bus differential protection intervals with a digitalization bus differential protection slave machine in a shifting mode, electrically connecting an interval combination unit and an intelligent terminal with primary equipment of the transformer station through cables, modifying the communication parameter arrangement of a digitalization bus differential protection main machine, and removing the slave machine. Compared to the prior art, the method provided by the invention has the following advantages: the digitalization bus differential protection main machine and the digitalization bus differential protection slave machine which are used for the intelligent transformer station are used at the same time during a reconstruction process, so that the reconstruction process exerts no influence on the protective operation mode and load distribution of the whole transformer station, the equipment power failure time during a reconstruction period is reduced, the reconstructed primary equipment requires power failure only for once, the bus differential protection withdrawal time is quite short, the electrical network operation reliability is higher, the construction difficulty is lowered, the working efficiency is improved, and the investment is quite small.
Description
Technical field
The present invention relates to a kind of building method of Intelligent transformer station, particularly a kind of method that adopts digitlization bus differential protection transformation Intelligent transformer station.
Background technology
Along with the further popularization of Intelligent transformer station construction and the extensive use of digital protection, the engineering application of digital protection in Intelligent transformer station construction and transformation is one of emphasis of intelligent substation construction.The importance of digitlization bus protection and protection range and application conditions and particularity are occupied extremely important status in the engineering application of Intelligent transformer station.Because Intelligent transformer station adopts Optical Fiber Transmission digital information; greatly reduced transformer station's inner cable wiring workload; shorten and install, debug the Intelligent transformer station cycle; and can realize protective relaying device and secondary circuit on-line monitoring, for carrying out relaying protection repair based on condition of component, provide robust techniques guarantee.The method that prior art is intelligent substation by traditional Transfomer Substation Reconstruction; because all intervals of bus can not once complete transformation; during transformation, bus differential protection device can not collect complete bus information, need to suspend the protection to bus, and this has brought potential safety hazard to power supply.
Summary of the invention
The remodeling method that the object of this invention is to provide a kind of Intelligent transformer station, the technical problem that solve is that during Intelligent transformer station is transformed, bus does not lose protection operation.
The present invention is by the following technical solutions: a kind of remodeling method of Intelligent transformer station, comprises the following steps:
One, information gathering is transmitted and is switched, the traditional transformer station being transformed arranges a digitlization bus differential protection main frame, by 1-12 interval of every digitlization bus differential protection handset access, the secondary cable at each interval of traditional transformer station's bus differential protection is shifted and is connected to digitlization bus differential protection handset, digitlization bus differential protection handset receives the intake at the interval being connected to, by every cycle 80 points, the interval of access is carried out to the of ac sampling of electric current and voltage, of ac is converted to digital quantity, by optical fiber, intake, digital quantity is transferred to digitlization bus differential protection main frame;
Two, digitlization bus differential protection main frame receives after intake that digitlization bus differential protection handset sends, digital quantity, according to the operational mode of the intake judgement bus at each interval, digital quantity is processed by bus protection criterion, realizes the real-time guard to bus;
Three, the primary equipment at interval is had a power failure, respectively interval merge cells and intelligent terminal are electrically connected to the transforming plant primary equipment at this interval by cable, then merge cells is connected by optical fiber with digitlization bus differential protection main frame with intelligent terminal, drops into primary equipment;
Four, to completing the interval of intellectualized reconstruction, revise the messaging parameter setting of digitlization bus differential protection main frame, the interval intake and the of ac that gather are sent by sending to be switched on merge cells and intelligent terminal in digitlization bus differential protection handset, realize the switching of transformation interval Information Monitoring;
Five, the digitlization bus differential protection main frame access spaced merge cells of institute and intelligent terminal, all remove handset, completes the transformation of Intelligent transformer station.
In the step 1 of the inventive method, digitlization bus differential protection handset receives the information of outputing that digitlization bus differential protection main frame sends; digitlization bus differential protection main frame sends protection actuating signal, by the relay of outputing of digitlization bus differential protection handset, realizes switch trip one time.
The digitlization bus differential protection handset of the inventive method receives the GOOSE tripping operation message of digitlization bus differential protection main frame transmission and carries out packet parsing according to the form of IEC61850 standard regulation; obtain digitlization bus differential protection main frame current send action command; in GOOSE message to should have interval set tripping operation outlet order time; outlet order is sent out, control corresponding exit relay outlet tripping operation.
The step 2 digitlization bus differential protection main frame of the inventive method sends to bus differential protection operation information the Automatic monitoring systems that are positioned at main control room, realizes the remote monitoring of substation operation personnel to bus differential protection; Described digitlization bus differential protection host stores bus differential protection operation information; Described bus differential protection operation information is the main frame intake that receives handset and send, digital quantity, main frame and the work information of communicating by letter of handset.
The step 3 of the inventive method drops into after primary equipment; merge cells and intelligent terminal will be delivered to digitlization bus differential protection main frame in the digital quantity of the of ac of the electric current of collection and voltage, intake; during connection merge cells and intelligent terminal are transformed in each interval; digitlization bus differential protection main frame still receives by the intake at transformation interval, by the digital quantity of the of ac of 80 collections of every cycle through digitlization bus differential protection handset, is combined digital quantity, the intake of on unit and intelligent terminal, delivering to main frame and does not process.
Before the messaging parameter of the step 4 modification digitlization bus differential protection main frame of the inventive method arranges, test, method of testing is:
Synchronism to digitlization bus differential protection handset and merge cells is tested, merge cells and digitlization bus differential protection handset uniformly-spaced send by the digital quantity of the of ac of 80 collections of every cycle to digitlization bus differential protection main frame, and digitlization bus differential protection main frame adopts interpolation synchronous method to process;
To bus differential protection configuration testing, adopt analog quantity tester simulated intelligence terminal, merge cells, digitlization bus differential protection handset or before transformation by digitlization bus differential protection main frame and intelligent terminal, merge cells, digitlization bus differential protection handset simulated field couples together by optical fiber, and install to intelligent terminal by under configuration file, merge cells, digitlization bus differential protection handset, check intelligent terminal, merge cells, whether normally between digitlization bus differential protection handset and digitlization bus differential protection main frame, communicate by letter, simulation adds intake to digitlization bus differential protection main frame, of ac, check whether digitlization bus differential protection main frame can correctly receive message, alarm, after action, information will trip, warning information correctly sends.
The interval intelligent terminal that the step 4 of the inventive method completes transformation send intake in real time, and merge cells carries out sending digitlization bus differential protection main frame in the of ac sampling of electric current and voltage analog-to-digital conversion to interval by 80, every cycle.
The digitlization bus differential protection handset of the inventive method gathers the of ac of multi-compartment electric current and voltage; the AC sampling data that obtain after analog-to-digital conversion conversion; AC sampling data are combined; by difference sampling algorithm, the AC sampling data of different interval are carried out to time synchronized; again each interval AC sampling data after merging are synchronously pressed to IEC61850-9-2 stipulations packing framing; convert light signal to, by optical fiber line, the message that comprises AC sampling value information is sent to digitlization bus differential protection main frame.
The digitlization bus differential protection handset of the inventive method gathers multi-compartment and opens into signal; convert digital information to; after the intake of choosing being packed according to the GOOSE message format of IEC61850 standard regulation; convert light signal to, by optical fiber line, the message that comprises intake data is sent to digitlization bus differential protection main frame.
The step 1 of the inventive method, for the configuration of dual tradition bus differential protection, a set of traditional bus differential protection configuration puts into operation all the time, another set of traditional bus differential protection configuration is out of service, and before the traditional bus differential protection exiting is configured, the of ac in each loop, interval is, the terminal of input and output amount cable connection sequentially accesses digitlization bus differential protection handset;
For substanceization tradition bus differential protection configuration outdoor breaker, instrument transformer secondary side, there are the of ac of the required access of bus differential protection, the spare contact of input and output amount, by cable, spare contact is accessed to digitlization bus differential protection handset, do not exit existing traditional bus differential protection;
Of ac, input and output amount that tradition bus differential protection configures required access are without standby contact; exit traditional bus protection, by the of ac in each loop, interval that connects before the traditional bus differential protection device exiting, the terminal of input and output amount cable connection sequentially accesses handset.
The present invention compared with prior art, adopt digitlization bus differential protection main frame and the digitlization bus differential protection handset that Intelligent transformer station is used to share in the process of transformation, transformation process does not affect protection operational mode and the sharing of load at the full station of transformer station, reduced the interruption duration of equipment during transforming, the primary equipment of being transformed only needs to have a power failure once, bus differential protection is shorter disengaging time, operation of power networks reliability is high, reduce difficulty of construction, increase work efficiency, invest less, only need to increase digitlization bus differential protection handset, digitlization bus differential protection handset can repeated multiple timesly be used.
Accompanying drawing explanation
Fig. 1 is digitlization bus differential protection main frame and the digitlization bus differential protection handset winding diagram of the embodiment of the present invention.
Fig. 2 is the digitlization bus differential protection main frame connection layout in embodiment of the present invention transformation process.
Fig. 3 is the digitlization bus differential protection main frame connection layout after the embodiment of the present invention has been transformed.
Schematic diagram when Fig. 4 is 1588 clock synchronous school of the embodiment of the present invention.
Fig. 5 is the digitlization bus differential protection handset circuit block diagram of the embodiment of the present invention.
Fig. 6 is the schematic diagram of interpolation synchronous method.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.The remodeling method of Intelligent transformer station of the present invention, adopts digitlization bus differential protection main frame (main frame) and the digitlization bus differential protection handset (handset) that Intelligent transformer station is used to share in the process of transformation, comprises the following steps:
One, information gathering is transmitted and is switched, each traditional transformer station being transformed arranges a main frame, traditional transformer station is carried out before intellectualized reconstruction, as shown in Figure 1, according to traditional transformer station actual interval number of being transformed, 1-12 interval of every estrade machine access, therefore the 110kV tradition transformer station being transformed can arrange 1-3 estrade machine, the secondary cable at each interval of traditional transformer station's bus differential protection is shifted and is connected to handset, by handset, carry out information gathering and be transferred to main frame, realizing information gathering switches, each handset receives the intake at the interval being connected to, by every cycle 80 points, the interval of access is carried out to of ac (of ac) sampling of electric current and voltage, and the of ac that sampling is obtained is converted to digital quantity, by optical fiber by intake, digital quantity transfers to main frame, the information of outputing that handset Receiving Host sends simultaneously, once main frame sends protection actuating signal, realizes switch trip one time by the relay of outputing by handset.
Two, main frame receives after intake that handset sends, digital quantity; according to the intake at each interval, judge the operational mode of traditional substation bus bar that this is transformed; digital quantity is carried out to normal process by bus protection criterion; the real-time guard of realization to bus; bus differential protection operation information is sent to the Automatic monitoring systems that are positioned at main control room; realize the remote monitoring of substation operation personnel to bus differential protection; and storing bus differential protection operation information in the administrative unit of main frame, handled easily personnel check at any time by the man-machine interface of main frame.Bus differential protection operation information is the main frame intake that receives handset and send, digital quantity, main frame and the work information of communicating by letter of handset.
Three, traditional transformer station is carried out to intellectualized reconstruction, as shown in Figure 2, primary equipment to the interval of soon being transformed has a power failure, respectively interval merge cells MU and intelligent terminal are electrically connected to the transforming plant primary equipment at this interval by cable, the electric current needing in order to collection and of ac, the intake of voltage, then merge cells MU is connected by optical fiber with main frame with intelligent terminal, drop into primary equipment, merge cells MU and intelligent terminal will be delivered to main frame in the digital quantity of the of ac of the electric current of collection and voltage, intake.During connection merge cells and intelligent terminal are transformed in each interval; main frame still receives by the intake at transformation interval, by the digital quantity of the of ac of 80 collections of every cycle through handset; be combined digital quantity, the intake of on unit and intelligent terminal, delivering to main frame and do not process, with bus differential protection during guaranteeing transformation, put into operation.
Four, traditional transformer station is carried out in intellectualized reconstruction, to completing the interval of intellectualized reconstruction, merge cells and intelligent terminal are by optical fiber access host, by revising the messaging parameter of main frame, arrange, the interval intake and the of ac that gather are sent by sending in handset to be switched on merge cells and intelligent terminal.The interval intelligent terminal that completes transformation send intake in real time, and merge cells carries out sending main frame in of ac sampling analog-to-digital conversion to interval by 80, every cycle, realizes the switching of transformation interval Information Monitoring.Revise the messaging parameter of main frame, by the network service MAC Address that is handset by the reception parameter at transformation interval, the application identities in APPID(IEC61850 stipulations), application identities is revised as MAC Address, APPID, the application identities of merge cells and intelligent terminal.
Five, all interval connects merge cells and intelligent terminal, and as shown in Figure 3, the main frame access spaced merge cells of institute and intelligent terminal, all remove handset, completes the transformation of Intelligent transformer station.
Described handset, as the visual plant in digitlization bus differential protection transformation process, gathers respectively the intake at a plurality of intervals, carries out of ac sampling simultaneously, and the of ac that sampling is obtained is converted to digital quantity, then intake and digital quantity are transferred to main frame.
Described main frame is the final bus differential protection device in transformer station's long-time running; tradition transformer station carries out after intellectualized reconstruction; main frame receives the digital quantity of the of ac of the electric current that send on each interval merge cells and voltage; the position signalling of the primary equipment sending on intelligent terminal (intake), the running status of judgement bus after calculating.Man-machine interface operating personnel by bus differential protection device can check bus operating condition at any time; when bus operation appearance is abnormal; the alarm of main frame stand by lamp, man-machine interface will provide warning information; and to the Automatic monitoring systems that are positioned at main control room, send in real time bus operation exception information by the network of the interior establishment of standing; main frame sends protection actuating signal, by the relay of outputing of intelligent terminal, realizes switch trip one time.On main frame, store bus differential protection operation information.In intellectualized reconstruction process, intake, digital quantity that main frame reception handset is sent carry out bus protection, when main frame sends protection actuating signal, by the relay of outputing of handset, realize switch trip one time.
Intelligent terminal is intelligent assembly, adopts cable to be connected with transforming plant primary equipment, is connected with the secondary device employing optical fiber such as protection, observing and controlling.Intelligent terminal gathers the intake of primary equipment, and intake is transferred to main frame; The amount of outputing of Receiving Host output, controls primary equipment action.Transforming plant primary equipment is the equipment of transformer station's transmission & distribution electric energy, comprises circuit breaker, isolation switch, main transformer etc.
Merge cells carries out the physical location of time correlation combination to the electric current from secondary transducer and voltage data.Merge cells is as the interface arrangement of electronic current, voltage transformer, to electric current with voltage merges and synchronous processing, by the digital data transmission after processing to main frame.But a component parts of merge cells electronic current, voltage transformer, also a separate unit.
As shown in Figure 5, handset is provided with alternating current sampling circuit (AC sampling plate), modulus A/D convertor circuit, opens into circuit (opening entering plate), digital output circuit (exit plate), analog quantity sampling SV communication interface (SV communication interface board), towards transformer substation case GOOSE communication interface (GOOSE communication interface board), optical fiber interface, the power supply of general object.On the GOOSE communication interface board of handset, receive light mouth and arrange in pairs with transmission light mouth.Each circuit and interface adopt 1000M high velocity, low pressure differential signal transmission LVDS(Low Voltage Differential Signaling) bus.Each circuit of handset and interface classifying rationally plate, be reasonably assigned to each plate amount of calculation, makes full use of the advantage of Distributed Calculation, realizes high-performance.Handset can realize AC sampling and the transmission of input and output amount at 12 intervals, tunnel.Adoption Network measure and the precision interval clock synchronous protocol standard IEEE 1588 of control system synchronously to time, do not relying under external clock condition, with main frame coordinated synchronizeing of AC sampling and bus differential protection device to time.
Handset completes following work:
1, complete multi-compartment AC sampling and synchronous, will after AC sampling value modulus AD conversion, by direct-connected optical fiber, with substation communication network and system protocol IEC61850-9-2 stipulations message, send to main frame.
2, gather multi-compartment intake, by direct-connected optical fiber, intake is sent to main frame with GOOSE stipulations message.
3, the spaced apart output sending with GOOSE stipulations message by direct-connected optical fiber Receiving Host, then export tripping operation by relay.
The method of work of handset is:
1, exchange and gather, the AC sampling plate of handset gathers the of ac (AC sampling value) of multi-compartment electric current and voltage, A/D convertor circuit carries out AC sampling value the digital quantity (AC sampling data) obtaining after AD conversion, send to SV communication interface board, SV communication interface board combines the AC sampling data at each interval receiving, again each interval AC sampling data after merging are pressed to IEC61850-9-2 stipulations packing framing, by SV communication interface board glazing module converts, become light signal, optical fiber line by ST model optical fiber interface and connection thereof sends to main frame by the message that comprises AC sampling value information.
2, gather open into output tripping operation, the entering plate collection multi-compartment of opening of handset is opened into signal, send into GOOSE communication interface board, GOOSE communication interface board converts intake signal to digital information, according to the GOOSE functional module setting of handset, choose the intake data that main frame needs, after the intake of choosing being packed according to the GOOSE message format of IEC61850 standard regulation, by GOOSE communication interface board glazing module converts, become light signal, the optical fiber line by ST model optical fiber interface and connection thereof sends to main frame by the message that comprises intake data.
The GOOSE communication interface board of the handset GOOSE tripping operation message that Receiving Host sends simultaneously also carries out packet parsing according to the form of IEC61850 standard regulation, obtain the current action command situation of sending of main frame, in GOOSE message to should have interval set tripping operation outlet order time, GOOSE communication interface board sends to exit plate by the spaced apart output of outlet order, controls corresponding exit relay outlet tripping operation.
3, IEEE1588 synchronously to time, according to the difference of role in synchronizing process, equipment on network can be divided into two classes, master clock and from clock.Provide the master clock that cries of synchronous clock source, and synchronous clock is called from clock with it, thus master clock with from clock, be relative, any one network clocking can be served as master clock and from clock.As shown in Figure 4, when the first stage only has main frame to be connected with handset, main frame is as master clock, handset is as from clock, between main frame and handset, adopt point-to-point direct-connected mode, do not rely on external sync clock and the network switch and carry out inter-sync, communication reliability is high, and net synchronization capability is also high.Along with transformation is carried out, main frame access switch network, master/backup clock source is as master clock, main frame, intelligent terminal and merge cells all as from clock, receive master clock synchronous school time message realize synchronous.Handset, as from clock, when the main frame of can usining carries out synchronous school as master clock, also can be passed through the switch network of establishment in access station, message when conduct receives Network Synchronization school from clock together with main frame, intelligent terminal, merge cells.
The present embodiment is Intelligent transformer station for 330kV tradition Transfomer Substation Reconstruction; interval quantity is 16; 12 intervals of First handset access; second 4 intervals of estrade machine access; main frame adopts the BP-2C-D protection equipment for busbar of CYG Sunrui Co., Ltd.; merge cells adopts the BP-2C-D bus protection handset of CYG Sunrui Co., Ltd., and intelligent terminal adopts the NSR351D of Guodian Nannui Tech Co., Ltd, is divided into three phases:
1, the first stage is main frame and handset wiring and puts into operation, to reduce primary equipment interruption duration in intellectualized reconstruction process, guarantees that bus equipment is in there being guard mode operation, and concrete engineering embodiment is divided into two kinds:
Situation for the configuration of dual tradition bus differential protection, a set of traditional bus differential protection configuration puts into operation all the time, another set of traditional bus differential protection configuration is out of service, by the of ac in each loop, interval before traditional bus differential protection configuration of exiting, the terminal of input and output amount cable connection sequentially accesses handset, and main frame is connected by optical fiber with handset, after having changed, the wiring of all access handsets connects with main frame, by checking that main frame shows, determine the of ac that main frame gathers, it is consistent that intake gathers with on-the-spot a set of traditional bus differential protection, again by tester to bus differential protection logic and output loop and test, after determining that connection is no problem, digitlization bus differential protection main frame and digitlization bus differential protection handset are put into operation.
Situation for the configuration of substanceization tradition bus differential protection, if outdoor breaker, instrument transformer secondary side has the of ac of the required access of bus differential protection, the spare contact of input and output amount, by cable, spare contact is accessed to handset, can not exit in existing traditional bus differential protection situation, by the of ac in each loop, interval, the terminal of input and output amount cable connection is pressed the order access handset of design drawing design, main frame is connected by optical fiber with handset, after having changed, the wiring of all access handsets connects with main frame, by checking that main frame shows, determine the of ac that main frame gathers, output the amount of outputing with on-the-spot consistent, again by tester to bus differential protection logic and output loop and test, after determining that connection is no problem, digitlization bus differential protection main frame and digitlization bus differential protection handset are put into operation.
If traditional bus differential protection configures the of ac of required access, input and output amount is without standby contact, for reducing primary equipment interruption duration, need exit traditional bus protection, and as early as possible by the of ac in each loop, interval that connects before the traditional bus differential protection device exiting, the terminal of input and output amount cable connection sequentially accesses handset, main frame is connected by optical fiber with handset, after the wiring of all access handsets has been changed, complete main frame and handset wiring transformation and test, after test is normal, put into operation immediately, by checking that main frame shows, determine the of ac that main frame gathers, output the amount of outputing with on-the-spot consistent, and by tester to bus differential protection logic and output loop and test, after determining that connection is no problem, digitlization bus differential protection main frame and digitlization bus differential protection handset are put into operation.
Consider that bus differential protection device is as the protective device of substation bus bar; safe operation to bus is extremely important; except transformation is carried out perfect to protection, debugging scheme in uniting and adjustment process early stage; the communication configuration file that the protection logic of bus differential protection device, main frame are communicated by letter with handset is verified outside backup; also need after completing, wiring coordinate with handset main frame and belt fuser is tested, with the main frame that guarantees to put into operation and correctness and the test completeness of handset wiring.
Digitlization bus differential protection main frame after first stage completes and the wiring of digitlization bus differential protection handset are as shown in Figure 1.
2, second stage is the transformation interval that has a power failure, access digitlization bus differential protection main frame.
Coordinate the transformation interval that has a power failure to carry out digital improvement; primary equipment by transformation interval has a power failure; because having cable terminal, the interval after digital improvement can not be connected to traditional bus differential protection device; cause traditional bus differential protection device not collect improved interval information, traditional bus differential protection device is by out of service.Second stage is the emphasis step of bus differential protection intellectualized reconstruction, in transformation process, mainly comprises the following steps:
(1) transformed after the primary equipment power failure at interval; carry out the intellectualized reconstruction of the relevant protection in interval and circuit connection; remove the wiring at the interval that handset connected; interval merge cells MU and intelligent terminal are electrically connected to the transforming plant primary equipment at this interval by cable; merge cells MU is connected by optical fiber with main frame with intelligent terminal, changes the configuration file of main frame.
(2) bus differential protection device after having transformed is debugged to the correctness of checking bus differential protection logic, input and output amount, interface control document icd, character library form CID, reference database SCD file and relevant empty terminal connections.
(3) drop into transformation interval primary equipment, observe bus differential protection each interval AC sampling correctness and synchronism, observe poor stream and open into correctness, if bus differential protection normal operation can drop into bus differential protection.
Digitlization bus differential protection main frame in second stage transformation process connects as shown in Figure 2.
3, the phase III be all by transformation interval all access digitlization bus differential protection main frame.
After the equal access host in interval of all power failure transformations, can remove handset completely, the bus differential protection of Intelligent transformer station has been transformed.Shown in digitlization bus differential protection main frame connection layout 3 after having transformed.
Bus differential protection transformation adopts the pattern of main frame+handset, after the work of transformation connection main frame completes, need to test, and can revise the messaging parameter setting of main frame, drops into digitlization bus differential protection, and method of testing is:
(1) handset and interval merge cells synchronism detection
Because AC sampling synchronism is larger on the impact of bus differential protection differential current computing, therefore need test the synchronism of handset and merge cells.For guaranteeing of ac sample-synchronous, the present embodiment main frame adopts interpolation synchronous method, synchronously do not rely on external sync clock, merge cells and handset need uniformly-spaced to main frame, to send the digital quantity that comprises of ac information of 80, every cycle, guarantee that communication channel delay and actual time delay keep in full accord.
As shown in Figure 6; the principle of interpolation synchronous method: write down corresponding moment T11, T12, T13 and T21, T22, T23 when bus differential protection is received each sampled value of every circuit-switched data of merge cells and handset; entering on each resampling moment point T of interrupt routine; the data on each road all can have sampled value before and after it; according to front and back point numerical value and time difference constantly therewith; utilize Lagrange's interpolation algorithm can obtain one " synchronized sampling value ", the data on all roads " synchronized sampling value " are all that this is with reference to constantly.With reference to T constantly, move after by fixed interval, calculate and constantly carry out, so obtain continuous " synchronized sampling value ".
(2) bus differential protection configuration testing in transformation process
Bus differential protection configuration is the bus differential protection necessary file of communicating by letter, the MAC Address that comprises bus differential protection transmission GOOSE message that file generates by full station CONFIG.SYS SCD, APPID, GoID, the merge cells that GOOSE tripping operation information and bus differential protection need to be communicated by letter, intelligent terminal, the MAC Address of female poor handset, APPID, GoID, svID information, send the file of data message, when bus differential protection starts, need loading configuration file, by parameter wherein, determine the transmission parameter of bus differential protection message and determine whether the message of receiving is correct and from the message of receiving, obtains the information that device needs.
Because the present embodiment transformation interval quantity is many, transformation is pressed for time, transformation process relative complex, and bus differential protection configuration affects great on transformation process smoothly.Therefore the present embodiment in transformation process in bus differential protection configuration testing (uniting and adjustment) process for transformation each stage, bus differential protection is configured to test, configuration file is preserved to backup simultaneously.
Configuration testing is for adopting analog quantity tester simulated intelligence terminal, merge cells, handset or before transformation, main frame and intelligent terminal, merge cells, handset simulated field being coupled together by optical fiber, and intelligent terminal, merge cells, handset will be installed under configuration file, check between intelligent terminal, merge cells, handset and main frame, communicate by letter whether normal, simulation adds intake, of ac to main frame, check whether main frame can correctly receive message, after alarm, action, tripping operation information, warning information are correctly sent.Configuration file is not unique herein, but along with the progress of transforming, exist main frame Information Monitoring from handset, to be switched to the situation of intelligent terminal, merge cells, switch each time all corresponding configuration files of main frame, handset, intelligent terminal, merge cells configuration file are unique.
Special project test in uniting and adjustment process has guaranteed correctness and the consistency of each file configuration of transformation process; saved greatly the time that in transformation process, the final operating file of bus differential protection device configures and debugs simultaneously; guarantee that bus differential protection retrofit work carries out smoothly in planned time, puts into operation on time.
Bus differential protection device do not rely on outside to time system realize its defencive function, the present embodiment bus differential protection sample-synchronous mode adopts interpolation synchronous method.Because sample-synchronous is very large to digitlization bus differential protection performance impact, therefore handset is synchronizeed with each merge cells when uniting and adjustment, carry out special project test.
Special method of testing is: the sampling delay time that adopts mutual-inductor tester to be combined unit and handset is tested.The analog AC amount of standard source output is connected to the AC sampling input of mutual-inductor tester, by same road of ac sampling access data collecting unit DAU merge cells or handset, merge cells and the defeated light-emitting window of handset digital sample are connected to the light mouth of tester simultaneously.The synchronizing signal of transformer station is received to the synchronizing signal input of mutual-inductor tester, or used the synchronizing signal of this mutual-inductor tester the synchronizing signal output of mutual-inductor tester to be connected to merge cells.Angular difference and the ratio according to mutual-inductor tester, exported, can test merge cells and whether handset output time delay is accurate, and whether definite sample waveform is qualified.By serial connection electric current with and the mode that connects voltage the system synchronization performance of handset and merge cells is carried out to validation test.Because the present embodiment adopts traditional instrument transformer, can adopt analog quantity tester as standard source.
Method of the present invention is applicable to traditional transformer station of 1000kV and following electric pressure to carry out intellectualized reconstruction, the various main wiring modes that comprise single busbar connection, single mother partition, double-bus, the single segmentation of two mother, the two segmentations of two mother (realizing in a covering device) and 3/2 wiring, main electrical scheme change can complete by configuration.Maximum support main electrical scheme scale is 36 branch roads (circuit, element and interconnection switches).Method of the present invention adopts unified handset and system, has realized standardization, the modularization of handset, the configuration of system, convenient configuration and expansion.Handset is processed based on gigabit technology of Low Voltage Differential Signaling interface LVDS bus architecture and Design and application, realizes Data classification and processes, and realizes the mutual and low-power consumption of the Large Volume Data of protection equipment for busbar.Bus during LVDS school, each CPU board synchronization accuracy of handset can reach 0.1us.Synchronous and the multiple clock method of synchronization (pulse per second (PPS), B code, IEEE1588) of applicable interpolation.
Method transformation process of the present invention does not affect protection operational mode and the sharing of load at the full station of transformer station, and is applicable to various main wiring modes; Reduced the interruption duration of primary equipment during transforming; the primary equipment of being transformed only needs to have a power failure once; bus differential protection is shorter disengaging time; operation of power networks reliability is high; reduced difficulty of construction, increased work efficiency, invested less; only need to increase handset screen cabinet, handset screen cabinet can repeated multiple timesly be used.
Claims (10)
1. a remodeling method for Intelligent transformer station, comprises the following steps:
One, information gathering is transmitted and is switched, the traditional transformer station being transformed arranges a digitlization bus differential protection main frame, by 1-12 interval of every digitlization bus differential protection handset access, the secondary cable at each interval of traditional transformer station's bus differential protection is shifted and is connected to digitlization bus differential protection handset, digitlization bus differential protection handset receives the intake at the interval being connected to, by every cycle 80 points, the interval of access is carried out to the of ac sampling of electric current and voltage, of ac is converted to digital quantity, by optical fiber, intake, digital quantity is transferred to digitlization bus differential protection main frame;
Two, digitlization bus differential protection main frame receives after intake that digitlization bus differential protection handset sends, digital quantity, according to the operational mode of the intake judgement bus at each interval, digital quantity is processed by bus protection criterion, realizes the real-time guard to bus;
Three, the primary equipment at interval is had a power failure, respectively interval merge cells and intelligent terminal are electrically connected to the transforming plant primary equipment at this interval by cable, then merge cells is connected by optical fiber with digitlization bus differential protection main frame with intelligent terminal, drops into primary equipment;
Four, to completing the interval of intellectualized reconstruction, revise the messaging parameter setting of digitlization bus differential protection main frame, the interval intake and the of ac that gather are sent by sending to be switched on merge cells and intelligent terminal in digitlization bus differential protection handset, realize the switching of transformation interval Information Monitoring;
Five, the digitlization bus differential protection main frame access spaced merge cells of institute and intelligent terminal, all remove handset, completes the transformation of Intelligent transformer station.
2. the remodeling method of Intelligent transformer station according to claim 1; it is characterized in that: in described step 1, digitlization bus differential protection handset receives the information of outputing that digitlization bus differential protection main frame sends; digitlization bus differential protection main frame sends protection actuating signal, by the relay of outputing of digitlization bus differential protection handset, realizes switch trip one time.
3. the remodeling method of Intelligent transformer station according to claim 2; it is characterized in that: described digitlization bus differential protection handset receives the GOOSE tripping operation message of digitlization bus differential protection main frame transmission and carries out packet parsing according to the form of IEC61850 standard regulation; obtain digitlization bus differential protection main frame current send action command; in GOOSE message to should have interval set tripping operation outlet order time; outlet order is sent out, control corresponding exit relay outlet tripping operation.
4. the remodeling method of Intelligent transformer station according to claim 1, it is characterized in that: described step 2 digitlization bus differential protection main frame sends to bus differential protection operation information the Automatic monitoring systems that are positioned at main control room, realizes the remote monitoring of substation operation personnel to bus differential protection; Described digitlization bus differential protection host stores bus differential protection operation information; Described bus differential protection operation information is the main frame intake that receives handset and send, digital quantity, main frame and the work information of communicating by letter of handset.
5. the remodeling method of Intelligent transformer station according to claim 1, it is characterized in that: described step 3 drops into after primary equipment, merge cells and intelligent terminal are by the digital quantity of the of ac of the electric current gathering and voltage, in intake, deliver to digitlization bus differential protection main frame, during connection merge cells and intelligent terminal are transformed in each interval, digitlization bus differential protection main frame still receives by the intake at transformation interval through digitlization bus differential protection handset, by the digital quantity of the of ac of 80 collections of every cycle, be combined the digital quantity of delivering to main frame on unit and intelligent terminal, intake is not processed.
6. the remodeling method of Intelligent transformer station according to claim 1, is characterized in that: before the messaging parameter that described step 4 is revised digitlization bus differential protection main frame arranges, test, method of testing is:
Synchronism to digitlization bus differential protection handset and merge cells is tested, merge cells and digitlization bus differential protection handset uniformly-spaced send by the digital quantity of the of ac of 80 collections of every cycle to digitlization bus differential protection main frame, and digitlization bus differential protection main frame adopts interpolation synchronous method to process;
To bus differential protection configuration testing, adopt analog quantity tester simulated intelligence terminal, merge cells, digitlization bus differential protection handset or before transformation by digitlization bus differential protection main frame and intelligent terminal, merge cells, digitlization bus differential protection handset simulated field couples together by optical fiber, and install to intelligent terminal by under configuration file, merge cells, digitlization bus differential protection handset, check intelligent terminal, merge cells, whether normally between digitlization bus differential protection handset and digitlization bus differential protection main frame, communicate by letter, simulation adds intake to digitlization bus differential protection main frame, of ac, check whether digitlization bus differential protection main frame can correctly receive message, alarm, after action, information will trip, warning information correctly sends.
7. the remodeling method of Intelligent transformer station according to claim 1; it is characterized in that: the interval intelligent terminal that described step 4 completes transformation send intake in real time, merge cells carries out sending digitlization bus differential protection main frame in the of ac sampling of electric current and voltage analog-to-digital conversion to interval by 80, every cycle.
8. the remodeling method of Intelligent transformer station according to claim 1, it is characterized in that: described digitlization bus differential protection handset gathers the of ac of multi-compartment electric current and voltage, the AC sampling data that obtain after analog-to-digital conversion conversion, AC sampling data are combined, by difference sampling algorithm, the AC sampling data of different interval are carried out to time synchronized, again each interval AC sampling data after merging are synchronously pressed to IEC61850-9-2 stipulations packing framing, convert light signal to, by optical fiber line, the message that comprises AC sampling value information is sent to digitlization bus differential protection main frame.
9. the remodeling method of Intelligent transformer station according to claim 1; it is characterized in that: described digitlization bus differential protection handset gathers multi-compartment and opens into signal; convert digital information to; after the intake of choosing being packed according to the GOOSE message format of IEC61850 standard regulation; convert light signal to, by optical fiber line, the message that comprises intake data is sent to digitlization bus differential protection main frame.
10. the remodeling method of Intelligent transformer station according to claim 1, it is characterized in that: described step 1, for the configuration of dual tradition bus differential protection, a set of traditional bus differential protection configuration puts into operation all the time, another set of traditional bus differential protection configuration is out of service, and before the traditional bus differential protection exiting is configured, the of ac in each loop, interval is, the terminal of input and output amount cable connection sequentially accesses digitlization bus differential protection handset;
For substanceization tradition bus differential protection configuration outdoor breaker, instrument transformer secondary side, there are the of ac of the required access of bus differential protection, the spare contact of input and output amount, by cable, spare contact is accessed to digitlization bus differential protection handset, do not exit existing traditional bus differential protection;
Of ac, input and output amount that tradition bus differential protection configures required access are without standby contact; exit traditional bus protection, by the of ac in each loop, interval that connects before the traditional bus differential protection device exiting, the terminal of input and output amount cable connection sequentially accesses handset.
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