CN110928208A - Measurement and control system of power consumption information acquisition terminal - Google Patents
Measurement and control system of power consumption information acquisition terminal Download PDFInfo
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- CN110928208A CN110928208A CN201811094088.2A CN201811094088A CN110928208A CN 110928208 A CN110928208 A CN 110928208A CN 201811094088 A CN201811094088 A CN 201811094088A CN 110928208 A CN110928208 A CN 110928208A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
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Abstract
The invention provides a measurement and control system of a power utilization information acquisition terminal. The measurement and control system comprises a power supply unit, a storage unit, a signal processing and signal analyzing unit, a signal modulation and demodulation unit, a signal sending unit, a signal receiving unit, a signal coupling unit and a power frequency detection unit. The measurement and control system can accurately detect the transformer areas to which different physical devices belong, and is beneficial to improving the distinguishing and integration of information among the transformer areas.
Description
Technical Field
The invention relates to a measurement and control system of a power utilization information acquisition terminal for intelligent identification of a transformer area.
Background
The power utilization information acquisition system is an important component of smart grid construction, is a system for acquiring, processing and monitoring power utilization information of power consumers in real time, realizes automatic acquisition, metering abnormity, power quality monitoring and power utilization analysis and management of the power utilization information, and has the functions of related information publishing, monitoring of distributed energy resources, information interaction of intelligent power utilization equipment and the like. With the abundant functions of the acquisition terminal, the software operation is further complicated, the execution degree of the configuration parameters directly affects the function effect, and the self-diagnosis function of the acquisition terminal needs to be deepened urgently.
Meanwhile, the work of line loss statistical analysis, power distribution network scheduling and the like is under greater pressure due to the lag of the acquisition terminal and the electric energy meter file synchronization technology. The existing station area (area range of station transformer power supply) distinguishing technology mostly depends on criteria such as success or failure of power line communication or signal attenuation to distinguish physical station area attribution. There are two main causes of the zone crosstalk: 1. the plurality of transformers are close to each other, or the plurality of transformers are zero; 2. line overlap, etc. results in power line signal coupling crosstalk. However, under the typical zone crosstalk conditions, theoretically, crosstalk occurs in different zones regardless of the power line signals used in the different zones, and therefore, the zones to which the devices belong cannot be accurately distinguished.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a measurement and control system of a power utilization information acquisition terminal.
In order to achieve the purpose, the invention adopts the following technical scheme:
a measurement and control system of a power utilization information acquisition terminal comprises a power supply unit, a storage unit, a signal processing and signal analyzing unit, a signal modulation and demodulation unit, a signal sending unit, a signal receiving unit, a signal coupling unit and a power frequency detection unit;
the first power output end of the power supply unit is connected with the power input end of the power frequency detection unit, and the second power output end of the power supply unit is respectively connected with the power input ends of the storage unit, the signal processing and signal analyzing unit, the signal modulation and demodulation unit and the signal sending unit;
the information output end of the power frequency detection unit is respectively connected with the information input ends of the storage unit, the signal processing and signal analyzing unit, the signal modulation and demodulation unit and the signal sending unit;
the signal processing and analyzing unit is respectively connected with the storage unit and the signal modulation and demodulation unit;
the signal input end of the signal modulation and demodulation unit is connected with the signal output end of the signal receiving unit, and the signal output end of the signal modulation and demodulation unit is connected with the signal input end of the signal sending unit;
the signal input end of the signal receiving unit is connected with the signal output end of the signal coupling unit; and the signal output end of the signal transmitting unit is connected with the signal input end of the signal coupling unit.
Further, the power frequency detection unit adopts a power frequency detection comparison method, and whether the electric meters belong to the same distribution room or not is identified by testing the power frequency in the electric network and analyzing and comparing the difference of the power frequency.
The measurement and control system of the power utilization information acquisition terminal is beneficial to improving the distinguishing and integration of information between mutual transformer areas, can better utilize the existing resources to process and report the information of the transformer areas, improves the intelligent management level of the transformer areas and the utilization efficiency of communication channels, meets the automatic synchronization requirement of equipment files and the requirement of the acquisition system on the expandability of the acquisition terminal, and reduces the complexity of field operation and maintenance.
Drawings
FIG. 1 is a block diagram of the system of the present invention.
Fig. 2 is a flow chart of batch task processing of the collection terminal and the intelligent electric energy meter in the embodiment of the invention.
Fig. 3 is a schematic diagram of an intelligent electric energy meter archive reporting and identification optimization architecture in the embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings and the detailed implementation mode.
Fig. 1 shows a measurement and control system of the present invention, which includes a power supply unit, a storage unit, a signal processing and signal analyzing unit, a signal modulation and demodulation unit, a signal transmitting unit, a signal receiving unit, a signal coupling unit, and a power frequency detecting unit. The first power output end of the power supply unit is connected with the power input end of the power frequency detection unit, and the second power output end of the power supply unit is respectively connected with the power input ends of the storage unit, the signal processing and signal analyzing unit, the signal modulation and demodulation unit and the signal sending unit; the information output end of the power frequency detection unit is respectively connected with the information input ends of the storage unit, the signal processing and signal analysis unit, the signal modulation and demodulation unit and the signal sending unit; the first signal input and output end of the signal processing and signal analyzing unit is connected with the signal output and input end of the storage unit, the second signal input and output end of the signal processing and signal analyzing unit is connected with the signal output and input end of the signal modulation and demodulation unit, the signal input end of the signal modulation and demodulation unit is connected with the signal output end of the signal receiving unit, and the signal output end of the signal modulation and demodulation unit is connected with the signal input end of the signal sending unit; the signal input end of the signal receiving unit is connected with the signal output end of the signal coupling unit; and the signal output end of the signal transmitting unit is connected with the signal input end of the signal coupling unit.
In practical application, the working frequency based on the alternating current commercial power is 50Hz, but due to the change of the real-time load, the actual power frequency always generates a small deviation, such as 48.75Hz,50.23Hz and the like. The loads of different transformer areas cannot be completely the same, the different loads can cause different deviations of the power frequencies of the respective transformer areas, and simulation experiments show that the deviation difference degrees are enough to distinguish the transformer areas. Although the power frequency offsets of different measuring points in the same distribution area are not strictly the same, the difference is far smaller than the offsets of different distribution areas, and the physical distribution areas where the measuring points are located can be distinguished by comparing different offsets of a plurality of main nodes (transformer ends). The power frequency detection unit adopts a power frequency detection comparison method, and identifies whether the electric meters belong to the same district or not by testing the power frequency in the electric network and analyzing and comparing the difference of the power frequency.
After the ammeter signals are processed by the signal coupling unit, the ammeter signals are transmitted to the signal modulation and demodulation unit through the signal receiving unit, the ammeter signals are transmitted to the power frequency detection unit through modulation and demodulation to distinguish signal messages, only signals in the same region are allowed to reach the signal processing and signal analysis unit, the processed ammeter signals are transmitted to the signal transmission unit through the modulation and demodulation unit, the ammeter signals are transmitted to the commercial power system through the signal coupling unit and then transmitted to the previous-stage information acquisition station, and the received ammeter signals and the transmitted ammeter signals can be stored in the storage unit. The power supply unit is responsible for supplying power to other units and ensures that the units work normally. Through the process, the affiliated transformer areas of the different transformer area devices can be identified, and the electric meters in the different transformer areas can be accurately distinguished. As can be seen from the above description, in a plurality of station structures where crosstalk may exist, the zero-crossing offset feature distinguishing method is theoretically applicable to all station crosstalk situations, is a method combining a power line carrier zero-crossing time-sharing transmission carrier communication technology and alternating current zero-crossing phase offset statistics, and essentially realizes station distinguishing by utilizing the characteristic that different loads in different station areas cause different alternating current phase offsets.
By utilizing the measurement and control system, under the quality characteristics of different communication channels, the acquisition of terminal data and the processing and execution mechanism of communication tasks can be completed, the classification method of the acquisition tasks is standardized, the message content of the acquisition tasks is optimized, related communication protocols are revised, the acquisition terminals are released under the processing authority of the acquisition tasks to be executed in batch, the acquisition terminals are subjected to multi-task concurrency and task execution dynamic adjustment strategies under different communication channels, and the task execution efficiency of the acquisition terminals is improved. The batch task processing flow of the acquisition terminal and the intelligent electric energy meter is shown in fig. 2.
On the basis of the advantages and disadvantages of the existing service-oriented and future object-oriented electric energy meter communication protocol, passive discovery of the intelligent electric energy meter file is switched to active reporting, and the electric energy meter file reporting method, reporting mechanism and reporting strategy research are developed; meanwhile, different delay characteristics of communication channels provide a differentiation intelligent electric energy meter archive identification optimization strategy, the defect of identification accuracy of the existing acquisition terminal automatic meter searching measures is overcome, and intelligent electric energy meter archive information content such as terminal information, meter information and user information is expanded to assist station area information intelligent identification. Fig. 3 shows a schematic diagram of an intelligent electric energy meter archive reporting and identification optimization architecture.
Claims (2)
1. A measurement and control system of a power utilization information acquisition terminal is characterized by comprising a power supply unit, a storage unit, a signal processing and signal analyzing unit, a signal modulation and demodulation unit, a signal sending unit, a signal receiving unit, a signal coupling unit and a power frequency detection unit;
the first power output end of the power supply unit is connected with the power input end of the power frequency detection unit, and the second power output end of the power supply unit is respectively connected with the power input ends of the storage unit, the signal processing and signal analyzing unit, the signal modulation and demodulation unit and the signal sending unit;
the information output end of the power frequency detection unit is respectively connected with the information input ends of the storage unit, the signal processing and signal analyzing unit, the signal modulation and demodulation unit and the signal sending unit;
the signal processing and analyzing unit is respectively connected with the storage unit and the signal modulation and demodulation unit;
the signal input end of the signal modulation and demodulation unit is connected with the signal output end of the signal receiving unit, and the signal output end of the signal modulation and demodulation unit is connected with the signal input end of the signal sending unit;
the signal input end of the signal receiving unit is connected with the signal output end of the signal coupling unit; and the signal output end of the signal transmitting unit is connected with the signal input end of the signal coupling unit.
2. The system of claim 1, wherein the power frequency detection unit uses a power frequency detection comparison method, and identifies whether the electric meters belong to the same district by testing power frequency in the electric network and analyzing and comparing differences of the power frequency.
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