Below in conjunction with accompanying drawing, the embodiment of the present invention is further described:
A kind of power quality monitoring system for intelligent power grid, as shown in Figure 1, comprise electric energy quality monitoring system main website 2, electric energy quality monitoring terminal 1, voltage dip monitor 4 and other power information systems 3, electric energy quality monitoring terminal, electric energy quality monitoring system main website and other power information systems are linked in power telecom network by local area network (LAN), and electric energy quality monitoring terminal is arranged on each type load of intelligent grid and the point of presence of power supply.This monitoring system can cover all types of power supplys and load according to intelligent grid, point of presence at all types of loads and power supply has all been installed electric energy quality monitoring terminal, the effective monitoring function of realization to all types of power supplys of intelligent grid and load, above-mentioned point of presence comprises the conventional power source point of presences such as water power, thermoelectricity, photovoltaic, wind-powered electricity generation distributed power supply point of presence, the sensitive load point of presence such as Precision Machining, hospital, the pollutant sources load point of presences such as electricity iron, smelting, the special need for electricity user-network access point such as military project, government organs etc.For being similar to wind-powered electricity generation area of concentration and photovoltaic area of concentration, can consider only to concentrate at it installing electric energy quality monitoring terminal that is incorporated into the power networks, with the impact of monitoring distributed power source access on the electrical network quality of power supply.And for inside, distributed power source access area, wind energy turbine set for example, consider wind-powered electricity generation low voltage crossing problem, can concentrate to access at wind-powered electricity generation and arrange the voltage dip monitor in the area, to avoid voltage dip on the impact of wind-powered electricity generation, also can reduce the unnecessary wasting of resources of installing the global function electric energy quality monitoring terminal and causing simultaneously.Consider that electrified railway traction load produces the Penetration Signature of harmonics and negative sequence problem in electrical network, tackles the different electric pressures (110kV, 220kV) of its access and all monitors.Simultaneously, electric energy quality monitoring system can be interconnected by power telecom network and other power information systems, realizes the information interaction function.
This monitoring system is carried out the setting of point of presence according to the load character of intelligent grid by following principle:
(1) cover all kinds power supply and load, comprising: the conventional power source point of presences such as water power, thermoelectricity; Photovoltaic, wind-powered electricity generation distributed power supply point of presence; The sensitive load point of presence such as Precision Machining, hospital; The pollutant sources load point of presences such as electricity iron, smelting; The special need for electricity user-network access point such as military project, government organs etc.
(2) concentrate access not duplicate project of area, the monitoring of only considering to concentrate point of presence with type load or power supply;
(3) electrical network of certain type load area of concentration can be considered to arrange special monitoring device for part throttle characteristics, avoids unnecessary investment;
(4) consider electric pressure infiltration characteristics, reconnaissance should consider that different electric pressures distribute;
(5) considering to customize the electric device demand for control layouts.
Consider distributing rationally of electric energy quality monitoring resource, for power quality analysis lays the foundation, the intelligent grid monitoring system can be considered following collocation method:
(1) in conjunction with load or power supply characteristics and power quality analysis demand, monitoring terminal selected and configured, comprising the selection of terminal capabilities, the configuration of test index etc.;
(2) interconnected with other information systems, realize data sharing, avoid the data resource waste;
(3) consider customization electric device demand for control configuration monitoring terminal.
Electric energy quality monitoring terminal in native system adopt technical grade the embedded-type modularized CPU of ETX (Embedded TechnologyExtended), extensive field programmable logic device (FPGA), 32 floating-point signal processor (DSP), scale programmable logic device (CPLD), have the ARM CPU management that enriches interface, adopt layered distribution type parallel control technology, on the basis of the real-time that has guaranteed system, the rationally dispersion of whole system function, compact conformation, be easy to the expansion.as shown in Figure 2, electric energy quality monitoring terminal comprises transmitting module, data acquisition module, administration module, data processing and analysis module and gps time base modules, wherein, data acquisition module is connected and composed by data acquisition DSP and dual-port ARM, administration module is made of management DSP module and two-port RAM, data are processed with analysis module by embedded ETX, communication interface and Display and Print interface connect and compose, adopt interface or the differential interface of bus type between each intelligent object, fully guaranteed high data throughput capabilities, and have high accuracy and a high reliability.Monitoring terminal is after receiving the GPS synchronizing clock signals, form the synchronous acquisition control signal, under the control of synchronous acquisition signal, data acquisition module carries out synchronous acquisition and preliminary treatment, image data is delivered to respectively administration module by bus and is carried out related algorithm and calculate, and is processed and analysis module carries out the data storage, the data analysis processing module is carried out the processing such as data storage, analysis, printing and data remote by data.
The major function of monitoring terminal comprises:
(1) power quality parameter monitoring
The comprehensive monitoring power quality parameter comprises that voltage deviation, frequency departure, harmonic wave (50 times), a harmonic wave, electric current and voltage degree of unbalance, voltage fluctuation and flicker, first-harmonic and each harmonic are meritorious, reactive power, power factor etc.; The amplitude of harmonic voltage, electric current and phase place thereof; The containing ratio of each harmonic voltage and voltage resultant distortion rate thereof; Each harmonic is meritorious, reactive power, power factor etc.
(2) statistical function
Maximum, minimum value and the time of origin of statistics select time section, mean value, 95% probable value etc. generate various statistical report forms automatically.
(3) Drawing of Curve
Data are with the formal output of waveform, frequency spectrum, tendency chart and form.
Automatically generate various curves and form according to test result.
(4) record memory function
Have mass storage (〉=160G), all stored records were preserved 12 months at least, upgrade by the circulation of the principle of first in first out afterwards.
(5) record wave energy
Possesses complete record wave energy: the quality of power supply exceed standard record ripple (voltage deviation, frequency, imbalance, harmonic wave), the disturbance of electrical network transient state record ripple (short time voltage is interrupted, voltage falls, voltage swells), switching value displacement record ripple, manual test record ripple.The correct time that record exceeds standard and occurs, duration and amplitude can be done further fault rootstock analysis according to recorded wave file.Each Starting mode can be set to start or shielding according to on-site actual situations by the user.
(6) GPS to the time
Receive the external GPS contact to the time signal, guaranteed the synchronized sampling of all monitoring devices, all record data make power quality data closely related with recorder data and other data with markers definitely constantly.
(7) transporting function
Adopt LAN Technique and telecommunications network technology, networking mode is flexible, have Industrial Ethernet interface, MODEM interface, RS232, RS485 serial port, the ICP/IP protocol of support standard, through fiber optic network or MODEM dialing, realize data remote, consist of the electric energy quality monitoring net, realize that Long-distance Control calls, the expansion of site is unrestricted.
(8) passage configuration
Passage flexible configuration: can monitor 3*10 phase voltage or electric current at most, 16 way switch amount inputs.All Channel Synchronous samplings, the high accuracy of assurance result of calculation.
(9) parameter setting
System parameter setting, modification conveniently can locality or distant place modifications.
As shown in Figure 3, the OO distributed type open formula system architecture of electric energy quality monitoring system main website employing in native system, distributed system operation and an exploitation middleware software bag based on the CORBA standard have been set up between system and bottom different hardware system, different operating system, this software kit can be kept apart upper layer application and first floor system effectively, provide the environment of unitized overall development and operation for various upper layer application, with the requirement of adaptive system to opening, extensibility, portability, ease for maintenance, reliability and fail safe.Data interaction between the application system of electric energy quality monitoring system main website and backstage resource information model is all carried out data manipulation by the exchanges data adaptation layer based on distributed flexible bus, has so just isolated Back ground Information and service application fully from system of systems.Following business expansion and business change only need to be adjusted data model or operation flow according to specific requirement, can not cause the variation of system architecture, also can other business functions not exerted an influence because of the function adjustment of this business.The data model of electric energy quality monitoring system main website and exchanges data all adopt the open unified shader that meets international standard, can realize and other compatible systems between seamless interoperability, the simple possible that the collaborative work between native system and other manufacturer software products is become.System adopts the method for designing of OO system thinking and model-driven, the analysis system resource information consists of, set up complete transformer station's resource information model: the static information of resource object, spatial information, graphical information etc. are rubbed up together, formation meets international standard, complete, OO visual information model, has guaranteed advance and the practicality of software systems and management thought.Native system adopts the method for componentization to carry out the realization of software systems, thereby guarantees advance and practicality that software is realized.System has selected efficient, advanced developing instrument and development technique, under limited scale of investment, has greatly improved development efficiency and development quality, and make the development process of system controlled, efficient.The electric energy quality monitoring system main website adopts real-time data base, directly adopt DAIS/HDAIS as the data access interface of standard, avoid the interface conversion of data access, satisfy the harsh performance requirement that the mass data that comes from a plurality of data sources of different geographical distributions is carried out Real-time Collection, real-time storage, real-time calculating, real-time release.The electric energy quality monitoring system main website adopts data model and data communication interface unified, that meet international and domestic standard, and realizes that on this basis the whole network under unified configuration management interconnects and the total system data sharing.System fully uses OO Systems Theory, uses for reference the IEC/CIM standard criterion, follows IEC/CIM design philosophy unified planning design Common Information Model.The design reference of this model the series standards such as IEC61970/IEC61968, and be consistent with above-mentioned standard.System also provides the communication interface that meets OMG DAF/DAIS/HDAIS standard, with the data sharing demand between convenient and other system.
The electric energy quality monitoring system main website has following functions:
(1) data acquisition function module
System gathers the power quality data of monitoring terminal according to periodicity Timing Data Acquisition and instruction calling data acquisition dual mode; Instruction calling acquisition mode has the function of calling event data, real time data and Historical Monitoring data.
(2) data storage function module
The data that the data storage function module can full storage on-line monitoring equipment be uploaded; Data can be stored in the database that directly is connected, follow and store principle nearby.The core of data storage function module is database.The database of monitoring system comprises real-time data base and historical data base.Real-time data base is directly stored the data that online monitoring equipment is uploaded, and browses if will carry out real time data, data can be accessed from intermediate database; Intermediate database is also completed short time data general analyzes function, for example, and the general analyzes electric energy quality monitoring data of a day.Data in real-time data base are sent in historical data base stores, and according to approach such as monitoring point, monitored area, different electric pressures, power quality index is stored respectively, in order to can carry out afterwards the quick calling of data.
(3) data analysis query function module
The data analysis function module can be carried out the analysis and consult (calling data from the real-time data base of data storage function module) of real time data, result after analysis deposits historical data base in, when needing, also can carry out the analysis and consult (calling data from historical data base) of historical data.The following function of this Implement of Function Module: data processing, statistical function, chart Presentation Function, data query function etc.
(4) senior application module
Data analysis in the historical data base in the data memory function module comprises: a) according to the power quality index statistical conditions of geographic area, draw the dirty district figure of the quality of power supply; B) according to the statistics of historical data and the characteristic value of power quality index, carry out the event diagnosis, as: the voltage dip event source.Each function in senior application module can independently embed, in order to develop later on how senior application function.
(5) system service functions module
Mainly comprise following function: parameter setting (electrical network and load essential information can be set, support the remote parameter setting to monitoring terminal), information issue (having by web form web page issue power quality data function), user authority management, system to the time etc.
The course of work of native system is: the electric energy quality monitoring terminal that is distributed in each monitoring point, the quality of power supply is monitored constantly, and with the data that collect, be transferred to the electric energy quality monitoring system main website by power telecom network, the electric energy quality monitoring system main website is as data center, complete processing, storage and the issue of all data according to predetermined function, the user obtains relevant information in the mode that the client browses from main website according to the needs of self.
It is emphasized that; embodiment of the present invention is illustrative; rather than determinate; therefore the present invention is not limited to the embodiment described in embodiment; every other execution modes that drawn by those skilled in the art's technical scheme according to the present invention belong to the scope of protection of the invention equally.