CN110908317A - Marketing and distribution integrated measurement and control system based on novel TTU and double-core ammeter - Google Patents
Marketing and distribution integrated measurement and control system based on novel TTU and double-core ammeter Download PDFInfo
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- CN110908317A CN110908317A CN201911294082.4A CN201911294082A CN110908317A CN 110908317 A CN110908317 A CN 110908317A CN 201911294082 A CN201911294082 A CN 201911294082A CN 110908317 A CN110908317 A CN 110908317A
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
Abstract
The invention belongs to the technical field of power distribution network operation and distribution integrated key equipment, and particularly relates to an operation and distribution integrated measurement and control system based on a novel TTU (time-to-live) and a double-core ammeter. The system comprises a TTU terminal, an intelligent ammeter and an information acquisition module; the TTU terminal comprises a controller module, a compensation control module, a transformer power supply module and a wireless transceiving module; the controller module comprises an ARM9 embedded processor; the TTU terminal is connected with the intelligent ammeter through an RS485 bus; an electric quantity metering chip is arranged in the information acquisition module, and the intelligent ammeter comprises a main control module and an ammeter power supply module; the power supply module comprises a second switching power supply and a third power supply circuit which is led out from the second switching power supply and is connected to the electric meter main control module and the communication module so as to supply power to the CPU and the wireless communication device inside the electric meter main control module and the communication module. The marketing and distribution integrated measurement and control system based on the novel TTU and the double-core ammeter has strong data anti-jamming capability and high data stability, is favorable for improving the efficiency and the precision of marketing and distribution integrated data acquisition, and improves the anti-jamming capability of a data system.
Description
Technical Field
The invention belongs to the technical field of power distribution network operation and distribution integrated key equipment, and particularly relates to an operation and distribution integrated measurement and control system based on a novel TTU (time-to-live) and a double-core ammeter.
Background
In the automatic construction process of power distribution, in order to realize the automatic collection and pretreatment of data information and improve the informatization datamation level of a power grid, various intelligent terminals are required to be used, so that the accuracy of the data is improved through the mutual cooperation among the terminals, the early warning and judgment of various fault information are realized, and the stability and the efficiency of the power grid are improved. The number of intelligent terminals used in the distribution automation process is counted, and electric meter terminals, transformer terminals and the like can be found in the front row.
Based on huge domestic user quantity, the updating and maintenance of the electric meters and the transformers are the basis for ensuring the accurate and timely acquisition of the front-end data of the intelligent power grid, and at present, domestic manufacturers research and produce various types of intelligent electric meters and other equipment, so that the efficiency of remote meter reading and automatic electricity consumption information collection is greatly improved, and the long-history household meter reading method is changed. However, due to the limitations of technology, cost and the like, there are few intelligent terminals for transformer data collection and processing and interconnection terminals capable of being used in coordination with terminals such as an intelligent electric meter and the like, or only theoretical research is conducted, and meanwhile, due to the fact that data communication between domestic manufacturers is not smooth, interconnection capacity of intelligent terminals among different manufacturers and low data exchange and processing efficiency, high-speed interconnection which is advocated at present in China is compatible, efficient and inconsistent, and is not beneficial to continuous promotion of power distribution automation construction.
Disclosure of Invention
The invention aims to provide a marketing and distribution integrated measurement and control system based on a novel TTU and a double-core ammeter, which has strong data anti-interference capability and high data stability, is favorable for improving the efficiency and the precision of marketing and distribution integrated data acquisition and improving the anti-interference capability of a data system.
In order to achieve the purpose, the invention adopts the following technical scheme.
The invention relates to a marketing and distribution integrated measurement and control system based on a novel TTU (time to Unit) and a double-core ammeter, which comprises a TTU terminal, an intelligent ammeter and an information acquisition module;
the TTU terminal comprises a controller module, a compensation control module, a transformer power supply module and a wireless transceiving module;
the controller module comprises an ARM9 embedded processor;
the transformer power supply module comprises a first switching power supply, a first power supply circuit and a second power supply circuit, wherein the first power supply circuit is led out from the first switching power supply and is connected to the data series module, and the second power supply circuit is connected to the compensation control switch;
the TTU terminal is connected with the intelligent ammeter through an RS485 bus;
an electric quantity metering chip is arranged in the information acquisition module and used for completing the collection of electric quantity data, and a main distribution network data acquisition port of the electric quantity metering chip is connected with each of the transformers through a signal conditioning circuit and a mutual inductor in sequence; the load network data acquisition port is connected with a power utilization detection circuit connected with a power utilization circuit sequentially through a signal conditioning circuit, an isolation transformer, a low-voltage circuit breaker and a fast fuse;
the intelligent ammeter comprises a main control module and an ammeter power supply module; the power supply module comprises a second switching power supply and a third power supply circuit which is led out from the second switching power supply and is connected to the electric meter main control module and the communication module so as to supply power to the CPU and the wireless communication device inside the electric meter main control module and the communication module.
The marketing and distribution integrated measurement and control system based on the novel TTU and the double-core ammeter is further improved, the compensation control module is connected to the compensation circuit through a compensation control switch, and a compensation capacitor is arranged in the compensation circuit; the compensation circuit comprises a common compensation capacitor circuit arranged in a power circuit with the power utilization unbalance degree less than or equal to 15 percent, or a sub-compensation capacitor circuit arranged in a power circuit with the power utilization unbalance degree more than 15 percent; the compensation circuit further comprises a low-voltage circuit breaker and a fast-acting fuse arranged between the compensation circuit and the consumer grid.
And the compensation control switch refers to a relay or a silicon controlled switch for further improvement of the marketing and distribution integrated measurement and control system based on the novel TTU and the double-core ammeter.
The marketing and distribution integrated measurement and control system based on the novel TTU and the double-core ammeter is further improved, and a three-phase four-wire switching power supply is utilized to integrate a first switching power supply and a second switching power supply so as to simplify a circuit structure;
the three-phase rectification circuit is arranged between the three-phase four-wire switching power supply and a power grid, and the overload protection circuit is arranged on the front side of the three-phase four-wire switching power supply; the three-phase rectification circuit comprises a switching power supply transformer T and a rectification diode D which is led out from the output side of the switching power supply transformer T and then connected in parallelk1、Dk2K is 1, 2, 3; the overload protection circuit comprises a divider resistor R arranged on the output sidem1、Rm2M is 1, 2, 3, 4 and a triode R connected in seriesm1、Rm2(ii) a When the output current exceeds the limit value, the triode is biased to cut off and cut off the circuit.
The marketing and distribution integrated measurement and control system based on the novel TTU and the double-core ammeter is further improved, and the marketing and distribution integrated measurement and control system further comprises a power taking device and a voltage converter which are connected to a power grid, wherein the voltage converter is electrically connected to an external module respectively so as to provide 5V working voltage for the intelligent ammeter, a chip and a communication serial port and 48V voltage for a relay, a coupling device and switching value respectively; and the storage battery is connected to the GPRS module and the intelligent electric meter module to provide 12V charging voltage.
The measurement and control system based on the novel TTU and the double-core ammeter is further improved,
the anti-aliasing filtering structure comprises a plurality of resistors RiCapacitor Ci1, 2, 3, 4, 5, 6, 7, 8; connection point OjJ-1, 2, 3, 4, and an amplifier T,
R1is connected in series with the positive output end of T and O1Intermediate, R2Is connected in series with O1And O2Intermediate, R3Is connected in series with O1And between the inverting inputs of T, R4Is connected in series with O3And O4Intermediate, R5Is connected in series with the positive input end of T and O4Intermediate, R6Connected in series to the reverse output terminal of T and O4Intermediate, R7Is connected in series with O2And between the inverting inputs of T, R8Is connected in series with O3And in the middle of the positive input of T; c1Is connected in series between the reverse input end and the forward output end of the T; c2Is connected in series with O1And O4Middle; c3Is connected in series between the positive input end and the reverse output end of the T; c4Is connected in series with O2And O3Middle; c5Is connected in series with O2And the middle of the grounding end; c6Is connected in series with O3And the middle of the grounding end; c7Is connected in series with O1And the middle of the grounding end; c8Is connected in series with O4And the middle of the grounding end;
the further improvement of the marketing and distribution integrated measurement and control system based on the novel TTU and the double-core ammeter further comprises a multistage structure formed by connecting a plurality of anti-aliasing filtering structures in series.
Drawings
FIG. 1 is a schematic structural diagram of a marketing and distribution integrated measurement and control system based on a novel TTU and a double-core ammeter;
FIG. 2 is a schematic diagram of a three-phase rectifier circuit according to the present invention;
FIG. 3 is a schematic diagram of the overload protection circuit;
FIG. 4 is an anti-aliasing filtering structure;
fig. 5 is a graph of the frequency response of the present invention at different frequencies than the prior art structure.
Detailed Description
The invention is described in detail below with reference to specific embodiments.
The invention relates to a marketing and distribution integrated measurement and control system based on a novel TTU (time to live) and a double-core ammeter, which is mainly used for improving the data exchange efficiency and accuracy among multiple devices and reducing the operation difficulty in the process of integrating construction.
The structure principle of the marketing and distribution integrated measurement and control system based on the novel TTU and the double-core ammeter is shown in figure 1, and the marketing and distribution integrated measurement and control system comprises a TTU terminal, an intelligent ammeter and an information acquisition module;
the TTU terminal comprises a controller module, a compensation control module, a transformer power supply module and a wireless transceiving module; the controller module comprises an ARM9 embedded processor, in the embodiment, an ARM91RM9200 with high compatibility and high efficiency is preferably adopted,
the compensation control module is connected to the compensation circuit through a compensation control switch, and a compensation capacitor is arranged in the compensation circuit; the compensation circuit comprises a common compensation capacitor circuit arranged in a power circuit with the power utilization unbalance degree less than or equal to 15 percent, or a sub-compensation capacitor circuit arranged in a power circuit with the power utilization unbalance degree more than 15 percent;
in this embodiment, the compensation control switch is a relay or a thyristor switch, and by selecting a relay or a thyristor switch of which model is selected, automatic control of make-and-break of a supplementary circuit can be realized, and functions such as zero-cross protection can be realized, and a corresponding control flow and a circuit are more detailed in product specifications or scientific and technological data, so that the technology is mature, and is not described herein again;
the compensation circuit also comprises a low-voltage circuit breaker and a fast-acting fuse which are arranged between the compensation circuit and a user power grid; the low-voltage circuit breaker and the fast fuse can realize cut-off isolation under the conditions that the load of a power circuit is too high, or the circuit is short-circuited, or the voltage is lower than the rated voltage and the like, so that TTU (time to live) and other equipment are protected and prevented from being damaged;
the transformer power supply module comprises a first switching power supply, a first power supply circuit and a second power supply circuit, wherein the first power supply circuit is led out from the first switching power supply and is connected to the data series module, and the second power supply circuit is connected to the compensation control switch;
the TTU terminal is connected with the intelligent electric meter through an RS485 bus
The wireless transceiver module adopts the mature GPRS mobile communication network to complete the wireless data transmission according to the development condition of the domestic wireless communication system in order to ensure the timely and effective data transceiving and ensure that the widely distributed distribution transformers can be well covered and simultaneously consider the requirement of cost control,
the intelligent ammeter comprises a main control module and an ammeter power supply module; the electric meter power supply module comprises a second switching power supply and a third power supply circuit which is led out from the second switching power supply and is connected to the electric meter main control module and the communication module so as to supply power to a CPU and a wireless communication device in the electric meter main control module;
in a specific implementation process, the three-phase four-wire switching power supply can be utilized to integrate the first switching power supply and the second switching power supply, so that a circuit structure is simplified, and in order to improve the stability of the three-phase four-wire switching power supply, the three-phase four-wire switching power supply further comprises a three-phase rectifying circuit (shown in fig. 2) arranged between the three-phase four-wire switching power supply and a power grid, and an overload protection circuit (shown in fig. 3) arranged on the front side of the three-phase four-wire switching power;
in this embodiment, the three-phase rectification circuit includes a switching power transformer T and a rectification diode D led out from the output side of the switching power transformer T and connected in parallelk1、Dk2(k ═ 1, 2, and 3 are connected to three phases, respectively);
in this embodiment, the overload protection circuit includes a voltage dividing resistor R disposed on the output sidem1、Rm2(m ═ 1, 2, 3, 4) and a triode R connected in seriesm1、Rm2(ii) a When the output current exceeds the limit value, the triode is biased to cut off and cut off the circuit;
an electric quantity metering chip is arranged in the information acquisition module, the electric quantity metering chip is used for collecting electric quantity data, a finished product chip is generally adopted, ATT7022B is preferentially adopted in the invention, and a main distribution network data acquisition port of the electric quantity metering chip is connected with each terminal in sequence through a signal conditioning circuit and a mutual inductor and a transformer; the load network data acquisition port is connected with a power utilization detection circuit connected with a power utilization circuit sequentially through a signal conditioning circuit, an isolation transformer, a low-voltage circuit breaker and a fast fuse;
the signal conditioning circuit is at least provided with an anti-aliasing filtering structure so as to improve the electric quantity signal acquired by the mutual inductor; in the present invention, the anti-aliasing filter structure is shown in FIG. 5, and the anti-aliasing filter structure includes a plurality of resistors RiCapacitor Ci1, 2, 3, 4, 5, 6, 7, 8; connection point OjJ ═ 1, 2, 3, 4, and an amplifier T, wherein
R1Is connected in series with the positive output end of T and O1Intermediate, R2Is connected in series with O1And O2Intermediate, R3Is connected in series with O1And between the inverting inputs of T, R4Is connected in series with O3And O4Intermediate, R5Is connected in series with the positive input end of T and O4Intermediate, R6Connected in series to the reverse output terminal of T and O4Intermediate, R7Is connected in series with O2And between the inverting inputs of T, R8Is connected in series with O3And in the middle of the positive input of T; c1Is connected in series between the reverse input end and the forward output end of the T; c2Is connected in series with O1And O4Middle; c3Is connected in series between the positive input end and the reverse output end of the T; c4Is connected in series with O2And O3Middle; c5Is connected in series with O2And the middle of the grounding end; c6Is connected in series with O3And the middle of the grounding end; c7Is connected in series with O1And the middle of the grounding end; c8Is connected in series with O4And the middle of the grounding end;
based on the structure, the information acquisition module can better optimize data information, effectively improve indexes such as frequency characteristics of electric quantity signals, obtain data signals with better and more accurate quality, reduce the difficulty of subsequent data processing, improve the accuracy and the anti-interference capability of electric quantity acquisition, and obtain good effects in corresponding test processes of different bandwidths and frequencies in actual tests, wherein the actual situation is shown in fig. 5 and table 1.
TABLE 1 attenuation values at different frequencies
The structure of the invention keeps the pass band flat at the same time; the descending slope of the transition zone is larger, so that the frequency selection characteristic of the system is better than that of the traditional structure;
in a further improvement scheme, a multistage structure can be formed by connecting the anti-aliasing filtering structures in series, so that the effect is further improved;
finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. A marketing and distribution integrated measurement and control system based on a novel TTU and a double-core ammeter is characterized in that,
the system comprises a TTU terminal, an intelligent ammeter and an information acquisition module;
the TTU terminal comprises a controller module, a compensation control module, a transformer power supply module and a wireless transceiving module;
the controller module comprises an ARM9 embedded processor;
the transformer power supply module comprises a first switching power supply, a first power supply circuit and a second power supply circuit, wherein the first power supply circuit is led out from the first switching power supply and is connected to the data series module, and the second power supply circuit is connected to the compensation control switch;
the TTU terminal is connected with the intelligent ammeter through an RS485 bus;
an electric quantity metering chip is arranged in the information acquisition module and used for completing the collection of electric quantity data, and a main distribution network data acquisition port of the electric quantity metering chip is connected with each of the signal conditioning circuit, the mutual inductor and the transformer in sequence; the load network data acquisition port is connected with a power utilization detection circuit connected with a power utilization circuit sequentially through a signal conditioning circuit, an isolation transformer, a low-voltage circuit breaker and a fast fuse;
the intelligent ammeter comprises a main control module and an ammeter power supply module; the power supply module comprises a second switching power supply and a third power supply circuit which is led out from the second switching power supply and is connected to the electric meter main control module and the communication module to supply power to the CPU and the wireless communication device inside the electric meter main control module and the communication module.
2. The marketing and distribution integrated measurement and control system based on the novel TTU and the double-core ammeter as claimed in claim 1, wherein the compensation control module is connected to the compensation circuit through a compensation control switch, and a compensation capacitor is arranged in the compensation circuit; the compensation circuit comprises a common compensation capacitor circuit arranged in a power circuit with the power utilization unbalance degree less than or equal to 15 percent, or a sub-compensation capacitor circuit arranged in a power circuit with the power utilization unbalance degree more than 15 percent; the compensation circuit further comprises a low-voltage circuit breaker and a fast-acting fuse arranged between the compensation circuit and the user power grid.
3. The marketing and distribution integrated measurement and control system based on the novel TTU and the double-core electric meter is characterized in that the compensation control switch is a relay or a silicon controlled switch.
4. The marketing and distribution integrated measurement and control system based on the novel TTU and the two-core ammeter as claimed in claim 1, wherein a three-phase four-wire switching power supply is used to integrate the first switching power supply and the second switching power supply to simplify the circuit structure;
the three-phase rectification circuit is arranged between the three-phase four-wire switching power supply and a power grid, and the overload protection circuit is arranged on the front side of the three-phase four-wire switching power supply; the three-phase rectification circuit comprises a switching power supply transformer T and a rectification diode D which is led out from the output side of the switching power supply transformer T and then connected in parallelk1、Dk2K is 1, 2, 3; the overload protection circuit comprises a divider resistor R arranged on the output sidem1、Rm2M is 1, 2, 3, 4 and a triode R connected in seriesm1、Rm2(ii) a When the output current exceeds the limit value, the triode is biased to cut off and cut off the circuit.
5. The marketing and distribution integrated measurement and control system based on the novel TTU and the double-core ammeter is characterized by further comprising a power taking device and a voltage converter which are connected to a power grid, wherein the voltage converter is electrically connected to an external module respectively so as to provide 5V working voltage for the intelligent ammeter, a chip and a communication serial port and 48V voltage for a relay, a coupling device and a switching value respectively; and the storage battery is connected to the GPRS module and the intelligent electric meter module to provide 12V charging voltage.
6. The method according to claim 1Novel integrated measurement and control system for operation and distribution of TTU (time to Unit) and double-core ammeter and is characterized in that an anti-aliasing filtering structure comprises a plurality of resistors RiCapacitor Ci1, 2, 3, 4, 5, 6, 7, 8; connection point OjJ is 1, 2, 3, 4, and an amplifier T, R1Is connected in series with the positive output end of T and O1Intermediate, R2Is connected in series with O1And O2Intermediate, R3Is connected in series with O1And between the inverting inputs of T, R4Is connected in series with O3And O4Intermediate, R5Is connected in series with the positive input end of T and O4Intermediate, R6Connected in series to the reverse output terminal of T and O4Intermediate, R7Is connected in series with O2And between the inverting inputs of T, R8Is connected in series with O3And in the middle of the positive input of T; c1Is connected in series between the reverse input end and the forward output end of the T; c2Is connected in series with O1And O4Middle; c3Is connected in series between the positive input end and the reverse output end of the T; c4Is connected in series with O2And O3Middle; c5Is connected in series with O2And the middle of the grounding end; c6Is connected in series with O3And the middle of the grounding end; c7Is connected in series with O1And the middle of the grounding end; c8Is connected in series with O4And ground terminal.
7. The marketing and distribution integrated measurement and control system based on the novel TTU and the double-core electric meter as claimed in claim 6, further comprising a multi-stage structure formed by a plurality of anti-aliasing filtering structures connected in series.
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Application publication date: 20200324 |