CN111044779A - Distribution network on-line monitoring terminal module - Google Patents
Distribution network on-line monitoring terminal module Download PDFInfo
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- CN111044779A CN111044779A CN201911245096.7A CN201911245096A CN111044779A CN 111044779 A CN111044779 A CN 111044779A CN 201911245096 A CN201911245096 A CN 201911245096A CN 111044779 A CN111044779 A CN 111044779A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to an online monitoring terminal module for a power distribution network, and belongs to the field of monitoring of the running state of the power distribution network. The method is characterized in that a DSP (digital signal processor) is used as a core, and the acquisition of high-speed and high-precision three-phase alternating voltage and current signals and the processing of three-phase alternating voltage and current phasor value data of an online monitoring terminal are realized under the action of a GPS (global positioning system) real-time service module. The method comprises the following steps: the device comprises a voltage and current signal sampling circuit, a voltage and current signal conditioning circuit, an AD conversion circuit, a DSP control module, a power supply circuit, a reference voltage circuit and a clock circuit. The voltage and current signals collected are 3 paths respectively, the signals of the paths are independent and do not influence each other, the measurement function of the voltage and current phasor of the power transmission line is realized, and the running state data of the power distribution network can be monitored and uploaded in real time.
Description
Technical Field
The invention relates to the field of monitoring of running states of power distribution networks, in particular to an online monitoring terminal module for a power distribution network.
Background
Under the large background of construction of the ubiquitous power internet of things, the collection of electrical parameter information as the first step of the construction of the ubiquitous power internet of things is an extremely important means applied to real-time monitoring of a power system, and influences the safe and stable operation of the power system.
At present, the problem of low precision and the like generally exists in the domestic three-phase voltage and current acquisition technology due to the limitation of various factors such as equipment, technology and the like. With the promotion of the ubiquitous power internet of things construction, the requirements of three-phase voltage and current signal acquisition on precision and speed are higher and higher, so that the power distribution network online monitoring terminal module has great research value.
Disclosure of Invention
The invention aims to provide an online monitoring terminal module for a power distribution network, which solves the problems in the prior art. The invention improves the performance of the power distribution network online monitoring terminal module and improves the precision and speed of data acquisition. The invention has 3 voltage acquisition circuits and 3 current acquisition circuits, and can transmit the acquired three-phase voltage and current analog quantity to the DSP control chip after AD conversion through 6 voltage and current signal conditioning circuits. The acquisition of 6 paths of signals is not influenced mutually, and the signals are transmitted to a DSP control chip to be processed with high precision. The three-phase voltage current alternating current signal obtained by the AD chip is converted into digital quantity under the high-precision clock synchronization of the GPS to obtain a high-precision digital quantity signal, and then the signal is transmitted to the DSP for further analysis and processing of data to obtain a required phasor value.
The above object of the present invention is achieved by the following technical solutions:
the power distribution network online monitoring terminal module comprises a voltage and current signal sampling circuit, a voltage and current signal conditioning circuit, an AD conversion circuit, a DSP control module, a power supply circuit, a reference voltage circuit and a clock circuit;
the voltage and current signal sampling circuit comprises: the three-phase alternating voltage signal sampling circuit samples in a resistance voltage division mode, the sampling process of three-phase voltage signals is the same, the voltage signals are divided by high-precision resistors (R1 and R2), and enter an operational amplifier (U1) after being protected by voltage of voltage-stabilizing tubes (D1 and D2); the three-phase alternating current signal sampling circuit selects a current transformer for sampling, the sampling process of the three-phase current signals is the same, the current signal controls the selected current range through power relays (J1A, J2A), enters the input end of an INAK type current transformer (J0) through fuses (F1, F2) and enters an operational amplifier (U2).
The voltage and current signal conditioning circuit comprises: the voltage and current signal output from the sampling circuit enters a voltage and current signal conditioning circuit, and the 6 voltage and current signal conditioning circuits are consistent; the input signal is filtered by a voltage follower formed by an operational amplifier (U3) and a filter circuit formed by a capacitor (C2) and a resistor (R9).
The reference voltage circuit: a capacitor (C125) is connected in series between a power supply voltage VDD and DGND, the power supply voltage is input into a forward low dropout regulator (AS 1117-3.3V), and a capacitor is connected in series between an output voltage and a digital ground to obtain a reference voltage of 3.3V; a capacitor (C131) is connected in series between a power supply voltage VDD and DGND, the power supply voltage is input into a forward low dropout regulator (AS 1117-2.5V), and a capacitor is connected in series between an output voltage and a digital ground to obtain a reference voltage of 2.5V; a capacitor (C137) is connected in series between a power supply voltage VDD and DGND, the power supply voltage is input into a forward low dropout regulator (AS 1117-1.2V), and a capacitor is connected in series between an output voltage and a digital ground to obtain a reference voltage of 1.2V.
AD converting circuit and DSP control module and its connecting circuit: the AD conversion circuit (U4) is an AD7656 chip, input ends CH 1.1-CH 6.1 of the AD conversion circuit are three-phase voltage and three-phase current analog quantities acquired by the conditioning circuit, 16-bit decoded digital quantities are output at output ends of DB 0-DB 15 of the AD7656 chip, and are directly transmitted to an input end of a DSP controller (U6) through level conversion of a CPA level conversion chip (U5), and the DSP controller performs data processing according to real-time service signal pulses of a GPS and calculates the phasor value of high-precision three-phase voltage and current signals.
The invention has the beneficial effects that: the power distribution network online monitoring terminal module is connected with three-phase voltage and three-phase current signals in a power transmission line, corresponding AD conversion is carried out by using an AD conversion chip under the control of a DSP (digital signal processor) after the acquisition and signal conditioning of the three-phase voltage signals and the three-phase current signals, the operation data of a power line is transmitted to the DSP in the form of digital signals, the real-time service of the AD conversion chip and the DSP control chip is carried out by a GPS (global positioning system), and the DSP controller can realize the measurement of three-phase voltage and current phase values through data processing. Compared with a traditional data acquisition device, the power distribution network online monitoring terminal module has the advantages of accurate data acquisition, high safety, rapid acquisition and the like, can predict the operation of the power system through the measured power signal phase value, timely troubleshoots faults, and enhances the safe and stable operation of the power system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.
FIG. 1 is a block diagram of the overall architecture of the present invention;
FIG. 2 is a schematic diagram of a voltage signal sampling circuit according to the present invention;
FIG. 3 is a schematic diagram of a current signal sampling circuit according to the present invention;
FIG. 4 is a schematic diagram of a voltage and current signal conditioning circuit according to the present invention;
FIG. 5 is a schematic diagram of a reference voltage signal circuit of the present invention;
FIG. 6 is a signal schematic diagram of a power supply circuit of the present invention;
FIG. 7 is a schematic diagram of an AD conversion circuit according to the present invention;
FIG. 8 is a schematic diagram of a connection circuit between the AD and the DSP according to the present invention;
FIG. 9 is a schematic diagram of the minimum system circuit of the DSP chip of the present invention.
Detailed Description
The details of the present invention and its embodiments are further described below with reference to the accompanying drawings.
Referring to fig. 1 to 9, the power distribution network online monitoring terminal module of the invention takes a DSP TMS32028335 as a core, and realizes the acquisition of high-speed and high-precision three-phase alternating voltage and current signals and the processing of three-phase alternating voltage and current phasor value data of the online monitoring terminal under the action of a GPS real-time service module. It includes: the device comprises a voltage and current signal sampling circuit, a voltage and current signal conditioning circuit, an AD conversion circuit, a DSP control module, a power supply circuit, a reference voltage circuit and a clock circuit. The voltage and current signals collected are 3 paths respectively, the signals of the paths are independent and do not influence each other, the measurement function of the voltage and current phasor of the power transmission line is realized, and the running state data of the power distribution network can be monitored and uploaded in real time.
The voltage and current signal sampling circuit comprises: the three-phase alternating voltage signal sampling circuit selects a resistance voltage division mode for sampling, the sampling process of the three-phase voltage signals is the same, and sampling of A-phase voltage is taken as an example. Voltage signals are divided by high-precision resistors (R1 and R2), are protected by voltage of voltage-stabilizing tubes (D1 and D2) and enter an OPA2277 type operational amplifier (U1); the three-phase alternating current signal sampling circuit selects a current transformer for sampling, the sampling process of the three-phase current signal is the same, and the sampling of the phase A current is taken as an example. The current signal controls the current range to be selected through G4W type power relays (J1A, J2A), enters the input end of an INAK type current transformer (J0) through fuses (F1, F2) and enters an OPA2277 type operational amplifier (U2).
The voltage and current signal conditioning circuit comprises: the voltage and current signal output from the sampling circuit enters a voltage and current signal conditioning circuit, and the 6 voltage and current signal conditioning circuits are consistent; the input signal is filtered by a voltage follower formed by an OP4177 operational amplifier (U3) and a filter circuit formed by a capacitor (C2) and a resistor (R9).
The reference voltage circuit: a capacitor (C125) is connected in series between a power supply voltage VDD and DGND, the power supply voltage is input into a forward low dropout regulator (AS 1117-3.3V), and a capacitor is connected in series between an output voltage and a digital ground to obtain a reference voltage of 3.3V; a capacitor (C131) is connected in series between a power supply voltage VDD and DGND, the power supply voltage is input into a forward low dropout regulator (AS 1117-2.5V), and a capacitor is connected in series between an output voltage and a digital ground to obtain a reference voltage of 2.5V; a capacitor (C137) is connected in series between a power supply voltage VDD and DGND, the power supply voltage is input into a forward low dropout regulator (AS 1117-1.2V), and a capacitor is connected in series between an output voltage and a digital ground to obtain a reference voltage of 1.2V.
AD converting circuit and DSP control module and its connecting circuit: the AD conversion circuit (U4) is an AD7656 chip, input ends CH 1.1-CH 6.1 of the AD conversion circuit are three-phase voltage and three-phase current analog quantities acquired by a conditioning circuit, 16-bit decoded digital quantities are output at output ends of DB 0-DB 15 of the AD7656 chip, and are directly transmitted to an input end of a TMS320F28335 type DSP controller (U6) through level conversion of a 74FCT163245 type CPA level conversion chip (U5), and the DSP controller carries out data processing according to real-time service signal pulses of a GPS and calculates the high-precision three-phase voltage and current signal phasor values.
Example (b):
referring to fig. 1 to 9, the power distribution network online monitoring terminal module of the present invention includes an operational amplifier (OPA 2277), a power relay (G4W), an operational amplifier (OP 4177), a low dropout regulator (AS 1117-3.3V), a low dropout regulator (AS 1117-2.5V), an AD conversion chip (AD 7656), a DSP control chip (TMS 320F 28335), a level conversion chip (74 FCT163245 CPA), fuses (F1 and F2), a current transformer (INAK), a capacitor (C1, etc.), a resistor (R1, etc.), an inductor (L1 and L2), etc. The method comprises the steps of accessing three-phase voltage signals and three-phase current signals in a power transmission line, conducting acquisition and signal conditioning on the three-phase voltage signals and the three-phase current signals, conducting corresponding AD conversion by using an AD conversion chip (AD 7656) under the control of a DSP, transmitting operation data of a power line to the DSP in the form of digital signals, conducting real-time service on the AD conversion chip (AD 7656) and a DSP control chip (TMS 320F 28335) through a GPS, and enabling a DSP controller to achieve measurement of three-phase voltage and current phasor values through data processing.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like of the present invention shall be included in the protection scope of the present invention.
Claims (4)
1. The utility model provides a distribution network on-line monitoring terminal module which characterized in that: the device comprises a voltage and current signal sampling circuit, a voltage and current signal conditioning circuit, an AD conversion circuit, a DSP control module, a power circuit, a reference voltage circuit and a clock circuit;
the voltage and current signal sampling circuit comprises: the three-phase alternating voltage signal sampling circuit samples in a resistance voltage division mode, the sampling process of three-phase voltage signals is the same, the voltage signals are divided by high-precision resistors (R1 and R2), and enter an operational amplifier (U1) after being protected by voltage of voltage-stabilizing tubes (D1 and D2); the three-phase alternating current signal sampling circuit selects a current transformer for sampling, the sampling process of the three-phase current signals is the same, the current signal controls the selected current range through power relays (J1A, J2A), enters the input end of an INAK type current transformer (J0) through fuses (F1, F2) and enters an operational amplifier (U2).
2. The distribution network on-line monitoring terminal module of claim 1, characterized in that: the voltage and current signal conditioning circuit comprises: the voltage and current signal output from the sampling circuit enters a voltage and current signal conditioning circuit, and the 6 voltage and current signal conditioning circuits are consistent; the input signal is filtered by a voltage follower formed by an operational amplifier (U3) and a filter circuit formed by a capacitor (C2) and a resistor (R9).
3. The distribution network on-line monitoring terminal module of claim 1, characterized in that: the reference voltage circuit: a capacitor (C125) is connected in series between a power supply voltage VDD and DGND, the power supply voltage is input into a forward low dropout regulator (AS 1117-3.3V), and a capacitor is connected in series between an output voltage and a digital ground to obtain a reference voltage of 3.3V; a capacitor (C131) is connected in series between a power supply voltage VDD and DGND, the power supply voltage is input into a forward low dropout regulator (AS 1117-2.5V), and a capacitor is connected in series between an output voltage and a digital ground to obtain a reference voltage of 2.5V; a capacitor (C137) is connected in series between a power supply voltage VDD and DGND, the power supply voltage is input into a forward low dropout regulator (AS 1117-1.2V), and a capacitor is connected in series between an output voltage and a digital ground to obtain a reference voltage of 1.2V.
4. The distribution network on-line monitoring terminal module of claim 1, characterized in that: AD converting circuit and DSP control module and its connecting circuit: the AD conversion circuit (U4) is an AD7656 chip, input ends CH 1.1-CH 6.1 of the AD conversion circuit are three-phase voltage and three-phase current analog quantities acquired by the conditioning circuit, 16-bit decoded digital quantities are output at output ends of DB 0-DB 15 of the AD7656 chip, the digital quantities are directly transmitted to an input end of a controller (U6) through level conversion of a CPA level conversion chip (U5), the DSP controller carries out data processing according to real-time service signal pulses of a GPS, and the high-precision phasor value of three-phase voltage and current signals is calculated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911245096.7A CN111044779A (en) | 2019-12-06 | 2019-12-06 | Distribution network on-line monitoring terminal module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911245096.7A CN111044779A (en) | 2019-12-06 | 2019-12-06 | Distribution network on-line monitoring terminal module |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111707864A (en) * | 2020-06-12 | 2020-09-25 | 青岛中加特电气股份有限公司 | Circuit device for collecting current of three-phase motor |
| CN111929524A (en) * | 2020-09-18 | 2020-11-13 | 青岛罗德环境科技有限公司 | Electric energy quality on-line monitoring system |
| CN113252976A (en) * | 2021-05-19 | 2021-08-13 | 云南电网有限责任公司电力科学研究院 | Acquisition monitoring device for wide-frequency electric parameters of 10kV power distribution network |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209707588U (en) * | 2019-03-25 | 2019-11-29 | 杭州电力设备制造有限公司 | A kind of three-phase voltage current acquisition device of PMU |
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2019
- 2019-12-06 CN CN201911245096.7A patent/CN111044779A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209707588U (en) * | 2019-03-25 | 2019-11-29 | 杭州电力设备制造有限公司 | A kind of three-phase voltage current acquisition device of PMU |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111707864A (en) * | 2020-06-12 | 2020-09-25 | 青岛中加特电气股份有限公司 | Circuit device for collecting current of three-phase motor |
| CN111929524A (en) * | 2020-09-18 | 2020-11-13 | 青岛罗德环境科技有限公司 | Electric energy quality on-line monitoring system |
| CN113252976A (en) * | 2021-05-19 | 2021-08-13 | 云南电网有限责任公司电力科学研究院 | Acquisition monitoring device for wide-frequency electric parameters of 10kV power distribution network |
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Application publication date: 20200421 |