CN101364109A - Machine-net dynamic safety system and method based on actual measurement - Google Patents
Machine-net dynamic safety system and method based on actual measurement Download PDFInfo
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- CN101364109A CN101364109A CNA2008102232417A CN200810223241A CN101364109A CN 101364109 A CN101364109 A CN 101364109A CN A2008102232417 A CNA2008102232417 A CN A2008102232417A CN 200810223241 A CN200810223241 A CN 200810223241A CN 101364109 A CN101364109 A CN 101364109A
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Abstract
The invention discloses an actual measurement based machine network dynamic safety assessment system and the method thereof, which belong to the field of measurement and dynamic stable control techniques of power systems. The technical proposal is as follows: the system comprises the following six parts: a microcomputer machine network parametric comprehensive measurement device, a remote management systems, a background analytical software system, a machine network coupling modeling system, a power grid data information platform and a dynamic safety assessment system. The method comprises the following steps: arranging the microcomputer machine network parametric comprehensive measurement device in a power plant, collecting field data of the steam turbine, the power generator and the dynamic process of the power grid, transmitting the data to the data center via the network or the communication means, carrying out a series of analysis processing of the data to obtain the machine network dynamic coupling model and parameters, and completing the dynamic safety assessment and the time-domain simulation and verification of the power system. The system and the method establish the close relation between the dynamic safety and stability of the power system and the dynamic process stability of the power generator set and the power grid and provide the guarantee for the machine network coordinative operation of the power system.
Description
Technical field
The invention belongs to the measurement and the dynamic stability control technology field of electric system, relate in particular to a kind of machine-net dynamic safety evaluating system and method based on actual measurement.
Background technology
The safe and stable operation of electric system is the significant problem that is related to national security and people's lives.Electric system is in operation, and often may be subjected to the interference of various natures or human factor, and the noise amplitudes that has not quite or very fast decay, and is little to system's influence on system operation; Some interference may lead to grave consequences, and causes system stability destruction, device damage or causes large-area power-cuts.After electric system is subjected to little interference, if consider regulator and element dynamically, and analyze it and after transient state process, can be tending towards or be called dynamic stability analysis near the problem of original steady working condition operation.The safe and stable operation monitoring and the Electrical Power System Dynamic security and stability analysis of electric system are the important contents of electric system correlation technique department research always.Conventional electric power security of system stable operation monitoring is to be the dispatching and monitoring system of representative with data acquisition and supervisor control SCADA and energy management infosystem EMS and relevant application software, coming down to the power system mesomeric state Behavior Monitor System on the trend level, is can't monitoring record for the dynamic security stable operation of electric system.At present, electric system mainly adopts phase angle measurement device (PMU) monitoring Electrical Power System Dynamic parameter, but its deficiency is that monitoring variable is single, covering scope is little, the electric parameter that only comprises the generators in power systems grid side, ignored the coupled characteristic in generating plant steam turbine, generator and the electrical network dynamic process, often cause the mechanism understanding of some dynamic process of electrical power system unclear, cause the deviation of Electrical Power System Dynamic safety and stability evaluation, influence determining and enforcement of power system stability control measure.In addition, generating plant steam turbine, generator and electrical network are interaction, closely-coupled integral body, machine net (genset and electrical network are called for short the machine net) coordinated operation is extremely important to power system safety and stability, when some stability of power system problems of research, must take all factors into consideration interaction, especially the Electrical Power System Dynamic safety and stability problem of machine net.The coupled characteristic of consideration machine net dynamic process, the composite measurement machine network dynamic parameter, and carry out the Electrical Power System Dynamic safety and stability evaluation based on measured data, also there not be the research of being correlated with both at home and abroad; And generating set capacity constantly increases in the modern power systems, and genset dynamically strengthens day by day to the influence of power system stability.Therefore, setting up the machine-net dynamic safety evaluating system that gears to actual circumstances is of great practical significance.
Summary of the invention
The object of the present invention is to provide a kind of machine-net dynamic safety evaluating system and method based on actual measurement, by machine network dynamic parameter collection and analysis to the generating plant, can obtain electric system machine net dynamic model and parameter, and realize the stable assessment of electric system machine-net dynamic safety in conjunction with the operation of power networks technical data.
Technical scheme of the present invention is, a kind of machine-net dynamic safety evaluating system based on actual measurement is characterized in that described system comprises microcomputer type machine network parameters comprehensive measurement device, distant place management system, backstage analyzing software system, machine net coupling modeling, electric network data information platform, six parts of dynamic secure estimation system; Wherein,
Described microcomputer type machine network parameters comprehensive measurement device comprises touch-screen, industrial control host, microcomputer keyboard and data acquisition channel cabinet;
Described distant place management system is carried out communication by dedicated network and microcomputer type machine network parameters comprehensive measurement device, and by management work station or method of operation workstation, microcomputer type machine network parameters comprehensive measurement device is carried out remote operation and management;
Described backstage analyzing software system is realized decompression, data pre-service, the data qualification of record data and is checked and the Physical Mechanism of data is explained;
Described machine net coupling modeling is realized the modelling of machine net Dynamic Coupling, identification of Model Parameters and result's details classification and is checked;
Described electric network data information platform is based on the operation of power networks technical data, realizes the determining of steam turbine, generator and operation of power networks situation, is used for the decision information that provides support to the dynamic secure estimation system;
Described dynamic secure estimation system reference operation of power networks technical data, utilize Prony methods analyst actual measurement machine network dynamic parameter data, its result and Power System Off-line dynamic calculation result contrast, realize the analysis of Electrical Power System Dynamic safety assessment, and utilize the time-domain-simulation of the machine net Dynamic Coupling model of being set up to realize checking.
Described data acquisition channel cabinet inside comprises collection plate, data aggregation plate, communication management plate, system management unit, gps time plate, high-speed a/d card.
A kind of machine-net dynamic safety appraisal procedure based on actual measurement is characterized in that described method comprises the following steps:
Step 1: the on-the-spot microcomputer type machine network parameters comprehensive measurement device of installing in the generating plant;
Step 2: in the analyzing software system of backstage, set the startup definite value;
Step 3: start microcomputer type machine network parameters comprehensive measurement device;
Step 4: microcomputer type machine network parameters comprehensive measurement device is gathered the field data of steam turbine, generator and electrical network dynamic process;
Step 5: in the collection site data, carry out signal condition, obtain measured data;
Step 6: distant place management system is passed through network, the measured data that management computer type machine network parameters comprehensive measurement device obtains;
Step 7: the backstage analyzing software system carries out pre-service to data;
Step 8: add electric network data information, provide decision support for establishing machine net Dynamic Coupling model and preference pattern parameter;
Step 9: in machine net coupling modeling, establish machine net Dynamic Coupling model;
Step 10: in machine net Dynamic Coupling model, carry out model parameter and debate knowledge;
Step 11: model parameter is debated the details of knowing the result show and preserve;
Step 12: the model structure of establishing is verified; And as required, carry out time-domain-simulation or return step 7 and establish machine net Dynamic Coupling model again and carry out model parameter and debate knowledge;
Step 13: utilize the Prony analytic approach that measured data is analyzed, obtain the behavioral characteristics of measured data;
Step 14: the behavioral characteristics of steam turbine thermal parameter and electrical network electric parameter is compared, obtain the coupling character between generating plant turbine generator and the electrical network;
Step 15: the small interference stability that utilizes the PSASP program to carry out electrical network calculates, and obtains Electrical Power System Dynamic security and stability index under the off-line case;
Step 16: result and measured data analysis result that previous step is obtained suddenly compare, and draw the machine-net dynamic safety assessment result based on measured data;
Step 17: utilize the machine net Dynamic Coupling model of being set up to carry out time-domain-simulation.
In the described step 3, starting microcomputer type machine network parameters comprehensive measurement device, serves as the starting criterion with power, voltage, DC quantity and rotor torsional oscillation, and the sudden change amount separately that comprises detects and out-of-limit detection; When electric system is disturbed, start the record ripple rapidly automatically, the dynamic parameter of directly noting generating plant steam turbine and governing system thereof, generator and excitation system thereof and electrical network changes.
In the described step 4, microcomputer type machine network parameters comprehensive measurement device is gathered the field data of steam turbine, generator and electrical network dynamic process, and the data of collection comprise high, medium and low voltage cylinder vapor pressure, generator outlet three-phase voltage, electric current, field voltage and electric current, rotating speed and key are mutually.
The present invention has overcome single in the past consideration electrical network dynamic perfromance, ignore the Dynamic Coupling characteristic between genset and electrical network, cause the problem of power system dynamic stability assessment deviation, the stability of Electrical Power System Dynamic safety and stability with the dynamic process of genset and electrical network is closely linked to each other, for the coordinated operation of research electric system machine net has accumulated the firsthand information; Simultaneously, by the resulting machine net of the present invention Dynamic Coupling model parameter accurately, reliably,, be applicable to the production practices of operation of power networks traffic department fully near actual conditions.
Description of drawings
Fig. 1 is the machine-net dynamic safety evaluating system principle of compositionality synoptic diagram based on actual measurement of the present invention.
Fig. 2 is the machine-net dynamic safety evaluating system hardware principle synoptic diagram based on actual measurement of the present invention.
Fig. 3 is a microcomputer type machine network parameters comprehensive measurement device panel synoptic diagram of the present invention.
Fig. 4 is the machine-net dynamic safety appraisal procedure process flow diagram based on actual measurement of the present invention.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that following explanation only is exemplary, rather than in order to limit the scope of the invention and to use.
Fig. 1 is the machine-net dynamic safety evaluating system principle of compositionality synoptic diagram based on actual measurement of the present invention.Among Fig. 1, dynamic thermal parameter of steam turbine and generator electrical network electric parameter are adopted the into preposition PC of microcomputer type machine network parameters comprehensive measurement device by data collecting card, and by serial ports realize with the station in the communication and the video data in real time of main frame, can also utilize network interface card, carry out communication by dedicated network and remote host, on remote host, carry out data processing, utilize machine net coupling modeling to carry out modeling analysis by the backstage analyzing software system.
Fig. 2 is the machine-net dynamic safety evaluating system hardware principle synoptic diagram based on actual measurement of the present invention.Among Fig. 2, the main workstation of 201 expressions, the main workstation modulator-demodular unit of 202 expressions, 203 expression far-end modulator-demodular units.
Fig. 4 is the process flow diagram based on the machine-net dynamic safety appraisal procedure of surveying of the present invention, among Fig. 4, determine machine net Dynamic Coupling model structure with reference to steam turbine and generator type, determine to carry out identification of Model Parameters after the model structure, identification finishes back display parameter identification result and matched curve, carries out the preservation of identification result simultaneously.
Among Fig. 4, step 401: the on-the-spot microcomputer type machine network parameters comprehensive measurement device of installing in the generating plant.According to the actual conditions of system, microcomputer type machine network parameters comprehensive measurement device is installed with generating plant technical work personnel.Microcomputer type machine network parameters comprehensive measurement device is placed between the electronics of collection control operation chamber, generating plant, and every measurement data passes in the microcomputer type machine network parameters comprehensive measurement device by cable.Installation process needs the source of clear and definite signal, and the division of labor of cable routing and the wiring of cable two guarantees wiring technology and well-equipped operation conditions.Fig. 3 is a microcomputer type machine network parameters comprehensive measurement device panel synoptic diagram of the present invention, comprises touch-screen, industrial control host, microcomputer keyboard, data acquisition channel cabinet.The staff can realize human-computer interaction by touch-screen and microcomputer keyboard, and industrial control host and data acquisition channel cabinet then are the core calculations parts of microcomputer type machine network parameters comprehensive measurement device.The terminal corresponding relation is set, terminal can be provided with in the software on the backstage and define behind the machine network parameters comprehensive measurement device, because each transducer plug-in unit is made up of four power packs and two voltage changers, therefore measurement mechanism rear end sub-definite can not be violated total quantity and wiring position, define before generally dispatching from the factory, in service there is no need revised, unless increase number of terminals.
Step 402: in the analyzing software system of backstage, set the startup definite value.Each road can be set start definite value, comprise the high limit value of voltage, the low limit value of voltage, voltage jump amount definite value, the high limit value of electric current, the low limit value of electric current, jump-value of current definite value, active power sudden change amount definite value, reactive power sudden change amount definite value, the high limit value of DC quantity, the low limit value of DC quantity, DC quantity sudden change amount definite value, torsional oscillation sudden change amount definite value, low frequency definite value, high frequency definite value.
Step 403: start microcomputer type machine network parameters comprehensive measurement device.Manually boot, in microcomputer type machine network parameters comprehensive measurement device runnable interface, start the record ripple, do continuously five times, should be able to reliably start.The starting criterion is power, voltage, DC quantity and rotor torsional oscillation, and the sudden change amount separately that comprises detects and out-of-limit detection; In addition, when electric system is disturbed, can start the record ripple automatically, the dynamic parameter of directly noting generating plant steam turbine and governing system thereof, generator and excitation system thereof and electrical network changes.
Step 404: microcomputer type machine network parameters comprehensive measurement device is gathered the field data of steam turbine, generator and electrical network dynamic process, obtains machine net measured data.Measurement data comprises high, medium and low cylinder pressure vapor pressure, generator outlet three-phase voltage, electric current, and field voltage and electric current, rotating speed and key are mutually.Vapor pressure is taken from pressure, reheater top hole pressure and intermediate pressure cylinder exhaust steam pressure behind the governing stage respectively.Generator outlet three-phase current voltage is taken from special-purpose current and voltage signals of relay protection or the special-purpose current and voltage signals of instrument.Because CT open circuit and PT short circuit not only can cause protective relaying maloperation to do, and can cause serious injury to the equipment or the person, so this work must carefully be consulted with power plant's special temporary labourer of relay, the special-purpose current and voltage signals of instrument is adopted in suggestion.The field voltage electric current is taken from corresponding transmitter.The measure speed gears that tach signal is installed from head, carry displacement transducer by steam turbine and obtain the measure speed gears pulse, also can directly draw from generating plant digital electro-hydraulic control system DEH (Digital Electric Hydraulic Control System) system.Equally, key signal identifies mutually from the key of head, can directly draw from the DEH system.
Step 405: in the collection site data, carry out signal condition.For guaranteeing normally carrying out and damage equipment not of A/D conversion, need carry out amplitude limit, filtering and shaping respectively to measuring-signal and handle.The voltage transformer secondary side voltage signal is higher, need carry out step-down and handle.The current transducer secondary side need insert a fixed resistance, and current signal is converted to voltage signal.Stabilivolt in the circuit shields.The signal that preposition low-pass filter stops frequency to be higher than the cutoff frequency of sampling is set enters the analog to digital conversion link.This partial function is realized by the signal condition card of machine network parameters comprehensive measurement device.
Step 406: distant place management system is passed through network, the field data that management computer type machine network parameters comprehensive measurement device is gathered, the distant place data of finishing microcomputer type machine network parameters comprehensive measurement device connect, and the definite value data of management computer type machine network parameters comprehensive measurement device.Distant place management system each several part functional analysis is as follows:
(1) checks distant place record ripple file: current all log file name catalogues on the disk of microcomputer type machine network parameters comprehensive measurement device are transmitted, transmit or deletion for browsing, selecting.
(2) deletion distant place record ripple file: after file directory is received, certain or some file that can select to delete.
(3) upload distant place record ripple file: after receiving file directory, the data upload of selecting hope to obtain also can select all files to upload.
(4) be interrupted that file is continuous to be passed: after transmission accident or the force interrupt, with this function last interrupted file of breakpoint transmission therefrom.
(5) distant place to the time: main website gives the time service of machine network parameters comprehensive measurement device, is used for unified each measurement mechanism clock.
(6) ripple is manually recorded in a distant place: whether normal, the correctness of checking record data if being used for the registering capacity of checking measurements device.
(7) distant place system reset: after measurement mechanism was received this order, guiding again automatically reset.
(8) real time data monitors: the short time every interior, data such as each channel information of measurement mechanism timed sending, warning information make the managerial personnel running status and the passage situation of control survey device in the distance.
(9) upload system file: the configuration file of measurement mechanism, definite value file are uploaded to main website.
(10) pass system file down: the definite value parameter of upgrading is passed to measurement mechanism.After this a distant place resets again, and new definite value is come into force.This function possesses access control, must the input operation password.
(11) distant place communication resets: make current connection recover a clean state.
(12) serial communication emulation: the developer can carry out emulation to serial communication.
Step 407: the backstage analyzing software system carries out pre-service to data.The pretreated effect of data is that steam turbine, generator and electrical network dynamic parameter data thereof that machine network parameters comprehensive measurement device writes down are at first decompressed, then voltage and power and the readable text file format of automatic generation through calculating fundamental positive sequence.The analog quantity channel number of a machine network parameters comprehensive measurement device is 64 to the maximum.The data of data pre-service input are the * .DAT file of machine network parameters comprehensive measurement device output and * .CFG configuration file of the same name.The output of this program is the famous value * .TUS of voltage power file.
Step 408: add electric network data information, provide decision support for establishing machine net Dynamic Coupling model and preference pattern parameter.Based on the operation of power networks technical data, realize determining to steam turbine, generator and operation of power networks situation.The electric network data information platform is used for to machine-net dynamic safety evaluating system provide support decision information, model structure and parameter for you to choose.This information platform is checked by calling the PSASP program based on PSASP (Power SystemAnalysis Software Package, Power System Analysis synthesizer) software database.
Step 409: in machine net coupling modeling, establish machine net Dynamic Coupling model.
Step 410: in machine net Dynamic Coupling model, carry out parameter identification.Identification program is an optimizer, generally needs given initial value and parameter bound, and this has default setting value in program.Can directly use setting value also can to customize by the requirement of oneself, method is very simple, is exactly directly to revise to get final product on program interface.The data that the identification of Model Parameters program adopts are * .TUS files of data pre-service output.The output of identification of Model Parameters program is divided into three parts: one, at every data come out one group of parameter and corresponding characteristics of identification all, this parameter and characteristic branch deposit file in text mode; Two, final complex optimum result exports (double optimization), output parameter identification result and error of fitting value; Three, modelling verification curve output, the only one group of parameter that exactly the complex optimum result is obtained is written into measured data and carries out match, to observe the capability of fitting of this parameter to measured data.
Step 411: model parameter is debated the details of knowing the result show and preserve.Every data to each measuring point all pick out one group of parameter, are stored in the file of pressing the measuring point name by row, and what obtain is a parameter library, the details that can conveniently check parametric variable.
Step 412: the model structure of establishing is verified; And as required, carry out time-domain-simulation or return step 7 and establish machine net Dynamic Coupling model again and carry out model parameter and debate knowledge.
Step 413: utilize the Prony analytic approach that measured data is analyzed, obtain the behavioral characteristics of measured data.Utilize the Prony signal analysis method, measured data segmentation gradation ground is analyzed, obtain the behavioral characteristics of measured data, comprise frequency, amplitude, damping ratio and the relative energy etc. of oscillatory process.
Step 414: the behavioral characteristics of steam turbine thermal parameter and electrical network electric parameter compares, and obtains the coupling character between generating plant turbine generator and the electrical network.Its result may be output as * .xls file with graphical or form demonstration.
Step 415: the small interference stability that utilizes the PSASP program to carry out electrical network calculates, and obtains Electrical Power System Dynamic security and stability index under the off-line case.Comprise low frequency oscillation mode, oscillation frequency and damping ratio, participation unit etc.
Step 416: result and measured data analysis result that previous step is obtained suddenly compare, and draw the machine-net dynamic safety assessment result based on measured data.
Step 417: utilize the machine net Dynamic Coupling model of being set up to carry out time-domain-simulation.The input identical with measured data is set, the output simulation result, and compare with the every data of actual measurement, analyzing the fitting degree of itself and measured data, its result is with graphical demonstration.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (5)
1, a kind of machine-net dynamic safety evaluating system based on actual measurement is characterized in that described system comprises microcomputer type machine network parameters comprehensive measurement device, distant place management system, backstage analyzing software system, machine net coupling modeling, electric network data information platform, six parts of dynamic secure estimation system; Wherein,
Described microcomputer type machine network parameters comprehensive measurement device comprises touch display screen, industrial control host and data acquisition channel cabinet;
Described distant place management system is carried out communication by dedicated network and microcomputer type machine network parameters comprehensive measurement device, and by management work station or method of operation workstation, microcomputer type machine network parameters comprehensive measurement device is carried out remote operation and management;
Described backstage analyzing software system is realized decompression, data pre-service, the data qualification of record data and is checked and the Physical Mechanism of data is explained;
Described machine net coupling modeling is realized the modelling of machine net Dynamic Coupling, identification of Model Parameters and result's details classification and is checked;
Described electric network data information platform is based on the operation of power networks technical data, realizes the determining of steam turbine, generator and operation of power networks situation, is used for the decision information that provides support to the dynamic secure estimation system;
Described dynamic secure estimation system reference operation of power networks technical data, utilize Prony methods analyst actual measurement machine network dynamic parameter data, its result and Power System Off-line dynamic calculation result contrast, realize the analysis of Electrical Power System Dynamic safety assessment, and utilize the time-domain-simulation of the machine net Dynamic Coupling model of being set up to realize checking.
2, the machine-net dynamic safety evaluating system based on actual measurement according to claim 1 is characterized in that described data acquisition channel cabinet inside comprises collection plate, data aggregation plate, communication management plate, system management unit, gps time plate, high-speed a/d card.
3, a kind of machine-net dynamic safety appraisal procedure based on actual measurement is characterized in that described method comprises the following steps:
Step 1: the on-the-spot microcomputer type machine network parameters comprehensive measurement device of installing in the generating plant;
Step 2: in the analyzing software system of backstage, set the startup definite value;
Step 3: start microcomputer type machine network parameters comprehensive measurement device;
Step 4: microcomputer type machine network parameters comprehensive measurement device is gathered the field data of steam turbine, generator and electrical network dynamic process;
Step 5: in the collection site data, carry out signal condition, obtain measured data;
Step 6: distant place management system is passed through network, the measured data that management computer type machine network parameters comprehensive measurement device obtains;
Step 7: the backstage analyzing software system carries out pre-service to data;
Step 8: add electric network data information, provide decision support for establishing machine net Dynamic Coupling model and preference pattern parameter;
Step 9: in machine net coupling modeling, establish machine net Dynamic Coupling model;
Step 10: in machine net Dynamic Coupling model, carry out model parameter and debate knowledge;
Step 11: model parameter is debated the details of knowing the result show and preserve;
Step 12: the model structure of establishing is verified; And as required, carry out time-domain-simulation or return step 7 and establish machine net Dynamic Coupling model again and carry out model parameter and debate knowledge;
Step 13: utilize the Prony analytic approach that measured data is analyzed, obtain the behavioral characteristics of measured data;
Step 14: the behavioral characteristics of steam turbine thermal parameter and electrical network electric parameter is compared, obtain the coupling character between generating plant turbine generator and the electrical network;
Step 15: the small interference stability that utilizes the PSASP program to carry out electrical network calculates, and obtains Electrical Power System Dynamic security and stability index under the off-line case;
Step 16: result and measured data analysis result that previous step is obtained suddenly compare, and draw the machine-net dynamic safety assessment result based on measured data;
Step 17: utilize the machine net Dynamic Coupling model of being set up to carry out time-domain-simulation.
4, the machine-net dynamic safety appraisal procedure based on actual measurement according to claim 3, it is characterized in that in the described step 3, starting microcomputer type machine network parameters comprehensive measurement device, serves as the starting criterion with power, voltage, DC quantity and rotor torsional oscillation, and the sudden change amount separately that comprises detects and out-of-limit detection; When electric system is disturbed, start the record ripple rapidly automatically, the dynamic parameter of directly noting generating plant steam turbine and governing system thereof, generator and excitation system thereof and electrical network changes.
5, the machine-net dynamic safety appraisal procedure based on actual measurement according to claim 3, it is characterized in that in the described step 4, microcomputer type machine network parameters comprehensive measurement device is gathered the field data of steam turbine, generator and electrical network dynamic process, the data of gathering comprise high, medium and low voltage cylinder vapor pressure, generator outlet three-phase voltage, electric current, field voltage and electric current, rotating speed and key are mutually.
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| CN102130454A (en) * | 2011-01-26 | 2011-07-20 | 广东电网公司电力科学研究院 | Dynamic stability control method and system for computer aided design based power system |
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