CN203536968U - A power-frequency communication apparatus for controlling reactive compensation switching - Google Patents

A power-frequency communication apparatus for controlling reactive compensation switching Download PDF

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Publication number
CN203536968U
CN203536968U CN201320681829.3U CN201320681829U CN203536968U CN 203536968 U CN203536968 U CN 203536968U CN 201320681829 U CN201320681829 U CN 201320681829U CN 203536968 U CN203536968 U CN 203536968U
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China
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circuit
frequency communication
power
pin
communication device
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Expired - Lifetime
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CN201320681829.3U
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Inventor
麦青
梁志武
蒙恩
邓志平
周定炜
田泉
陈作铭
龙光成
姚普粮
韦甘铭
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Beihai Shenlan Science And Technology Development Co ltd
Beihai Power Supply Bureau Of Guangxi Grid Co ltd
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Beihai Shenlan Science And Technology Development Co ltd
Beihai Power Supply Bureau Of Guangxi Grid Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Abstract

Provided is a power-frequency communication apparatus for controlling reactive compensation switching. The power-frequency communication apparatus is characterized by mainly comprising a microprocessor circuit, a power-frequency communication signal modulating circuit, a power-frequency communication signal sampling circuit, and a voltage zero crossing point detecting circuit, and a RS 485 communication interface circuit, wherein the power-frequency communication signal modulating circuit, the power-frequency communication signal sampling circuit, the voltage zero crossing point detecting circuit, and the RS 485 communication interface circuit are connected with the microprocessor circuit. The power-frequency communication apparatus for controlling reactive compensation switching has characteristics of simple structure and low cost, and is capable of effectively controlling the reactive compensation switching of a power distribution network.

Description

A kind of frequency communication device of controlling reactive compensation switching
Technical field
The utility model relates to power system automatic field, particularly relates to the frequency communication technology of controlling reactive compensation switching.
Background technology
Conventional low distribution network var compensation, conventionally adopt distribution transformer load side centralized compensation mode, in distribution low-voltage side, reactive power compensator is installed, utilize power-factor adjustment, the automatic part or all of capacity that drops into or excise step by step secondary capacitor of variation along with load, this compensation way only limits to reduce the power loss of distribution transformer itself and above power distribution network, the reactive power of carrying to low-voltage load still will be through resistance and the reactance of low-voltage circuit, between each load, exist idle backflowing, power loss is not fundamentally improved.
And adopt reactive power compensation to concentrate monitoring, the mode of dispersion compensation, at step down side, power network monitoring controller is installed, according to each distribute-electricity transformer district line length and load distribution situation choose reasonable infield, the idle the optimal compensation point or the load center that low-voltage reactive power compensation capacitor are disperseed to be arranged on to each outlet branch of low voltage electric network, then by the idle operational factor of power network monitoring controller real-time sampling power distribution network, comprehensive Analysis deterrmination the optimal compensation scheme, Long-distance Control compensation condenser local compensation, can reduce to greatest extent reactive current flowing on electrical network, reduce line loss, reach economical operation, improve the final purpose of the quality of power supply.
Realizing the remote distributed switching of compensation condenser controls, need to adopt a kind of easy reliable communication mode, the control command that power network monitoring controller is produced is sent to the reactive-load compensation capacitor that is dispersed in each point at a distance, start reactive compensation switching, and executing state is passed back to power network monitoring controller, could realize the object of concentrating monitoring and dispersion compensation.
Due to factors such as the interference of power distribution network very noisy and load decay, adopt traditional power line carrier, PLC to control in real time effect unsatisfactory, particularly, when network load is larger, efficient communication signal is flooded by noise signal completely, by load, absorbed totally, cannot communicate by letter normally .
Summary of the invention
The utility model object is to manufacture and design a kind of frequency communication device of controlling reactive compensation switching, by transmit long-range switching control command information in the faint distortion of power distribution network 50Hz voltage fundamental near zero-crossing point modulation voltage or current waveform, can overcome the impact of the factors such as the interference of electrical network very noisy and load decay, realize the remote data communication of high reliability, be applicable to long-range reactive compensation switching and control.
The purpose of this utility model is achieved in that a kind of frequency communication device of controlling reactive compensation switching, it is characterized by: the frequency communication signal modulation circuit that mainly comprise microcontroller circuit, is connected respectively with microcontroller circuit, frequency communication signal sample circuit, voltage over zero testing circuit and RS485 communication interface circuit.
RS485 communication interface circuit is made with MAX485 chip.
Take the utility model of above measure, simple in structure, cheap, can effectively control the reactive compensation switching of power distribution network.
Accompanying drawing explanation
Accompanying drawing 1 is the general function figure of the utility model frequency communication device;
Accompanying drawing 2 is circuit block diagrams of the utility model frequency communication device;
Accompanying drawing 3 is microcontroller circuit figure of the frequency communication device of the utility model embodiment;
Accompanying drawing 4 is circuit diagrams of frequency communication signal modulation circuit of the frequency communication device of the utility model embodiment;
Accompanying drawing 5 is circuit diagrams of frequency communication signal sample circuit of the frequency communication device of the utility model embodiment;
Accompanying drawing 6 is circuit diagrams of voltage over zero testing circuit of the frequency communication device of the utility model embodiment;
Accompanying drawing 7 is circuit diagrams of RS485 communication interface circuit of the frequency communication device of the utility model embodiment;
Accompanying drawing 8 is software flow patterns of the frequency communication device being connected with power network monitoring controller of the utility model embodiment;
Accompanying drawing 9 is software flow patterns of the frequency communication device being connected with reactive-load compensation capacitor of the utility model embodiment.
The utility model is described in further detail in conjunction with the accompanying drawings and embodiments more below.
Embodiment
Frequency communication signal modulation circuit, frequency communication signal sample circuit, voltage over zero testing circuit and RS485 communication interface circuit that the utility model mainly comprises microcontroller circuit, is connected with microcontroller circuit respectively.
The utility model is also provided with power circuit and is connected with foregoing circuit, and assurance foregoing circuit is normally worked.Power circuit can obtain with battery or from electrical network step-down rectifier.
Accompanying drawing 1 is general function figure of the present utility model.The utility model is for the frequency communication device of Remote low-pressure reactive compensation, be connected with power network monitoring controller, reactive-load compensation capacitor, form monitoring and the dispersion compensation reactive power system concentrated, its architecture as shown in Figure 1, power network monitoring controller is arranged on transformer low voltage outlet side, and reactive-load compensation capacitor disperses to be arranged on idle the optimal compensation point or the load center position of each outlet branch.Device inside is equiped with capacitor group, and capacitor group is connected with power distribution network by electronic power switches such as controllable silicon or solid-state relays.Power network monitoring controller and every reactive-load compensation capacitor are equipped with RS485 communication interface, by RS485 communication interface, are connected with frequency communication device, and frequency communication device is connected on power distribution network homophase power line.When a certain reactive-load compensation capacitor of power network monitoring controller transmission control command control carries out switching, order is by passing to the frequency communication device being connected under RS485 communication interface, start modulation circuit, control command modulation is sent in low voltage electric network, with grid voltage waveform, transmit, by frequency communication device corresponding in far-end low-voltage reactive compensator capable, received, by RS485 communication interface, upload to and be attached thereto the reactive-load compensation capacitor connecing, if device numbering and commands match, start and carry out switching control.Then by frequency communication device, switching state is sent in low voltage electric network to transmission telegram in reply net monitor controller.
Be arranged on frequency communication device that step down side is connected with power network monitoring controller by RS485 communication interface and the frequency communication device that is arranged on power distribution network load side and is connected with reactive-load compensation capacitor by RS485 communication interface, both hardware circuits are just the same, and all by low-voltage network homophase power line sending and receiving control command, but software flow is different.Frequency communication signal modulation circuit, frequency communication signal sample circuit, voltage over zero testing circuit, RS485 communication interface circuit that frequency communication device has microcontroller circuit, is connected with microcontroller circuit respectively.
The utility model is by the frequency communication device being connected on low-voltage network homophase power line for Remote low-pressure reactive compensation, by RS485 communication interface and power network monitoring controller, reactive-load compensation capacitor connects, form monitoring and the dispersion compensation reactive power system concentrated, there is following feature: 1, the power network monitoring controller of system transformer low tension outlet side is connected with frequency communication device by RS485 communication interface, the reactive-load compensation capacitor of each load point is connected with frequency communication device separately by RS485 communication interface, frequency communication device is all connected on homophase power line, need not lay in addition Control on Communication circuit.Power network monitoring controller generates switching control command according to control program, by passing to the frequency communication device being attached thereto under RS485 communication interface, then along power line, at voltage fundamental, carry the long-distance transmissions that frequency communication signal is realized switching control command, the frequency communication device of far-end is received after switching control command, is uploaded to the reactive-load compensation capacitor being attached thereto by RS485 communication interface.Reactive-load compensation capacitor is carried out after switching operation, by RS485 communication interface, the frequency communication device being attached thereto will be passed under switching state again, by frequency communication device, along power line, sent, by the frequency communication device being connected with power network monitoring controller, received, by RS485 communication interface, be uploaded to power network monitoring controller again, complete the implementation of an order.2, every reactive-load compensation capacitor arranges corresponding coding, and power network monitoring controller generates switching control command according to control program, and the reactive-load compensation capacitor coding of carrying out switching action is specified in order.The frequency communication device being attached thereto when reactive-load compensation capacitor, after receiving switching control command, judge whether to conform to self coding, if conform to, by RS485 communication interface, order is uploaded to reactive-load compensation capacitor and carries out switching, simultaneously by execution result passback, otherwise do not carry out.
Accompanying drawing 2 is circuit block diagrams of the utility model frequency communication device.Comprise: microcontroller circuit, frequency communication signal modulation circuit, frequency communication signal sample circuit, voltage over zero testing circuit, RS485 communication interface circuit.Microcontroller circuit: the modulation of power frequency component sends and sampling receives for controlling, and controls the data transmission of RS485 communication interface etc.Frequency communication modulation circuit: for sending switching control command frequency communication signal recklessly, when microprocessor sends triggering signal to modulation circuit, its zero crossing prepulse circuits for triggering modulate a transient current pulse, drive controllable silicon modulation circuit turn-on and disconnection, produce a faint distortion voltage signal, be coupling on voltage fundamental near zero-crossing point position, with voltage fundamental, at power line, transmit.Frequency communication signal sample circuit: for the power frequency signal of communication of sampling, when line voltage is during to the fixed sampling angle of zero crossing front lay, microprocessor starts to start sample circuit by certain sampling time interval transmitted signal, after a series of samplings, the grid voltage waveform data sampling that contains bit code distorted signal is sent into microprocessor decoding.Voltage over zero testing circuit: for detection of voltage zero-crossing point of power grid, send the time period of sampling with synchrodata.When voltage arrives zero crossing, produce zero passage interrupt signal to microprocessor, microprocessor is usingd this as initial time section control data transmission sampling.R485 communication interface circuit: for realizing frequency communication device and realizing communication connection with power network monitoring controller or reactive-load compensation capacitor.
Accompanying drawing 3 is microcontroller circuit figure of the utility model embodiment frequency communication device.Microcontroller circuit adopts the LPC2136 microprocessor chip with 64 pins, capacitor C 33, capacitor C 34, resistance R 23, crystal-vibration-chip X2 form 11.0592M crystal oscillating circuit, and microprocessor sends power frequency component Tidal stress high level signal by pin Ps to power frequency component signal of communication modulation circuit; By pin RORC, start that frequency communication signal sample circuit carries out power-frequency voltage analog signal A/D sampling and sampled data reads; By pin ADIN, when A/D has sampled, utilize STS low level signal to send out and read interrupt request singal, by microprocessor, control data are read back.Being connected of AD1674 chip corresponding pin by pin DB0, pin DB1, pin DB2, pin DB3, pin DB4, pin DB5, pin DB6, pin DB7, pin DB8, pin DB9, pin DB10, pin DB11 and frequency communication signal sample circuit, realizing the parallel of 12 sampled datas and read in.By pin Z0, the voltage zero-cross trigging signal of voltage over zero testing circuit output is introduced, trigger voltage zero passage is interrupted, and realizes the time synchronized of data input and data output; By pin RXD0, pin TXD0, pin RSDP, be connected with RS485 communication interface circuit, then by RS485 communication interface and power network monitoring controller or reactive-load compensation capacitor realization communication connection.
Accompanying drawing 4 is circuit diagrams of the frequency communication signal modulation circuit of the utility model embodiment frequency communication device.Frequency communication signal modulation circuit forms: controllable silicon Q2(CS 45-12IO1) and inductance L 3(4 ~ 10mH) form the thyristor gating circuit that is connected to power distribution network one phase circuit, chip 74HC08 with door U3 and resistance R 19, resistance R 20 forms and logic gates, resistance R 12, triode N1 (C8085), triode N3 (C8550), capacitor C 29 forms push-pull power amplifier circuit, pulse transformer TB2 converts signal to large current signal and drives controllable silicon, chip NE555, resistance R 55, resistance R 56, capacitor C 55, capacitor C 56, diode D55 forms oscillating signal generating circuit.The Tidal stress signal of being sent by micro processor leg Ps and self-oscillation signal output to push-pull power amplifier circuit and pulse transformer through AND circuit and amplify step by step and become silicon controlled gate pole triggering signal, trigger controlled silicon conducting, in power line coupling, produce 1 pulsed current signal, the modulation that realizes 1 bit code of control command sends.
Accompanying drawing 5 is circuit diagrams of the frequency communication signal sample circuit of the utility model embodiment frequency communication device.Frequency communication signal sample circuit forms: resistance R 70, resistance R 71, and capacitor C 70, instrument transformer PT01, operational amplifier U75A (NE5532), resistance R 72, resistance R 73, resistance R 74, capacitor C 71 form instrument transformer conversion and voltage signal amplifying circuit; Chip U18(AD1674), resistance R 32, resistance R 33 form A/D change-over circuit.Voltage is transformed into standard low voltage signal through instrument transformer conversion with voltage signal amplifying circuit, by pin V1 input A/D change-over circuit, convert digital signal to, then by pin DB0, pin DB1, pin DB2, pin DB3, pin DB4, pin DB5, pin DB6, pin DB7, pin DB8, pin DB9, pin DB10, pin DB11 by 12 position digital signal parallel conveys in microprocessor.
Accompanying drawing 6 is circuit diagrams of the voltage over zero testing circuit of the utility model embodiment frequency communication device.Resistance R 80, resistance R 81, chip U80(AN6914) formation voltage over zero testing circuit.When input voltage signal is positive voltage, output high level, when input voltage signal is low-voltage, output low level, voltage over zero is level flip-flop transition.The level energizing signal of output enters micro processor leg Z0 and triggers zero passage interruption.
Accompanying drawing 7 is circuit diagrams of the RS485 communication interface circuit of the utility model embodiment frequency communication device.Chip MAX485, resistance R 90, resistance R 91, form RS485 communication interface circuit, pin RXD0, pin TXD0, pin RSDP are connected with microprocessor, and pin A, pin B are connected with pin A, the pin B of the RS485 interface of power network monitoring controller or reactive-load compensation capacitor.When microprocessor is exported high level by pin RSDP, RS485 interface sends state in data, and frequency communication device outwards sends data.When microprocessor passes through pin RSDP output low level, RS485 interface is in data receiving state, and frequency communication device receives the data of power network monitoring controller or reactive-load compensation capacitor transmission.
Accompanying drawing 8 has provided the software flow pattern of the frequency communication device being connected with power network monitoring controller of the utility model embodiment, and accompanying drawing 9 has provided the software flow pattern of the frequency communication device being connected with reactive-load compensation capacitor of the utility model embodiment.While implementing the utility model, by above-mentioned software flow, those skilled in the art can compile out complete source program.

Claims (2)

1. a frequency communication device of controlling reactive compensation switching, is characterized by: the frequency communication signal modulation circuit that mainly comprise microcontroller circuit, is connected respectively with microcontroller circuit, frequency communication signal sample circuit, voltage over zero testing circuit and RS485 communication interface circuit.
2. the frequency communication device of control reactive compensation switching according to claim 1, is characterized by: RS485 communication interface circuit is made with MAX485 chip.
CN201320681829.3U 2013-11-01 2013-11-01 A power-frequency communication apparatus for controlling reactive compensation switching Expired - Lifetime CN203536968U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105262090A (en) * 2014-07-18 2016-01-20 北海市深蓝科技发展有限责任公司 Stepped active balance and reactive compensation management device for low-voltage transformer area
CN105262078A (en) * 2014-07-18 2016-01-20 北海市深蓝科技发展有限责任公司 Stepped active balance and reactive compensation management device for low-voltage transformer area
CN105262095A (en) * 2014-07-18 2016-01-20 北海市深蓝科技发展有限责任公司 Stepless active balance and reactive compensation management device for low-voltage transformer area
CN105281334A (en) * 2014-07-18 2016-01-27 北海市深蓝科技发展有限责任公司 Stepless active power balance and reactive power optimization voltage regulation treatment method of low-voltage transformer area
CN109920235A (en) * 2018-06-10 2019-06-21 福州准点信息科技有限公司 A kind of residential area Water-flowmeter auto-recording
CN111952975A (en) * 2020-07-24 2020-11-17 易事特集团股份有限公司 Power grid zero-crossing compensation method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105262090A (en) * 2014-07-18 2016-01-20 北海市深蓝科技发展有限责任公司 Stepped active balance and reactive compensation management device for low-voltage transformer area
CN105262078A (en) * 2014-07-18 2016-01-20 北海市深蓝科技发展有限责任公司 Stepped active balance and reactive compensation management device for low-voltage transformer area
CN105262095A (en) * 2014-07-18 2016-01-20 北海市深蓝科技发展有限责任公司 Stepless active balance and reactive compensation management device for low-voltage transformer area
CN105281334A (en) * 2014-07-18 2016-01-27 北海市深蓝科技发展有限责任公司 Stepless active power balance and reactive power optimization voltage regulation treatment method of low-voltage transformer area
CN109920235A (en) * 2018-06-10 2019-06-21 福州准点信息科技有限公司 A kind of residential area Water-flowmeter auto-recording
CN111952975A (en) * 2020-07-24 2020-11-17 易事特集团股份有限公司 Power grid zero-crossing compensation method
CN111952975B (en) * 2020-07-24 2022-05-03 易事特集团股份有限公司 Power grid zero-crossing compensation method

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Granted publication date: 20140409