CN106846782A - A kind of reactive-load compensation equipment that solves causes power carrier to be checked meter the equipment of problem - Google Patents
A kind of reactive-load compensation equipment that solves causes power carrier to be checked meter the equipment of problem Download PDFInfo
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- CN106846782A CN106846782A CN201710123406.2A CN201710123406A CN106846782A CN 106846782 A CN106846782 A CN 106846782A CN 201710123406 A CN201710123406 A CN 201710123406A CN 106846782 A CN106846782 A CN 106846782A
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- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
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Abstract
Power carrier is caused to be checked meter the equipment of problem the present invention relates to a kind of reactive-load compensation equipment that solves, MEC devices and carrier meter reading concentrator are connected on the circuit of the three-phase four-wire system between distribution transformer and user's electric energy meter, including wave resistance device of checking meter, the wave resistance device of checking meter is connected with the MEC devices, and the MEC devices pass through on the circuit of the three-phase four-wire system that the wave resistance device of checking meter is connected between the carrier meter reading concentrator and user's electric energy meter.In a kind of solution reactive-load compensation equipment of the present invention causes the equipment that power carrier checks meter problem, wave resistance device of checking meter is connected with MEC devices, the high-frequency signal of the influence carrier meter reading that MEC devices externally send can be suppressed, such that it is able to improve success rate of checking meter, power carrier is influenceed to check meter problem when solving MEC class device high volume applications, and industrialized implementation scheme is given, be conducive to power system reducing energy consumption and power distribution network to upgrade.
Description
Technical field
The present invention relates to Field of Electricity Meter Reading System, and in particular to one kind solves reactive-load compensation equipment and causes power carrier to be checked meter to ask
The equipment of topic.
Background technology
The General Office of the State Council in 2016, Committee of Development and Reform's joint propose to the national rural area of the year two thousand twenty to realize substantially reliable and stable
Electric service all standing, rural power grids power supply reliability reaches 99.8%, and plan for upgrading rural power grids invests 700,000,000,000 yuan；National energy
Source office also indicates that " 13 " distribution investment for trnasforming urban land more than 2 trillion yuans.The supply of electric power of safety, high-quality and low consumption in distribution transformation
It is main performance assessment criteria, currently, the positive high-volume of low-voltage network installs the idle benefit based on power electronics by power distribution station
Repay or three-phase imbalance is automatically adjusted etc. that electric energy quality optimizing device is uneven to carry out harmonic compensation, reactive-load compensation and three-phase
Weighing apparatus compensation, so as to administer the problem that local power distribution station power grid quality is present, improves distribution security reliability, and reach energy-conservation
Effect.(abbreviation MEC refers to that containing the reactive-load compensation based on power electronics, three-phase imbalance mends to comprehensive power quality optimization device
Repay and harmonic compensation function) industry development opportunity is exactly welcome in this context.
At present, also there is large number of area and realize that electric power terminal is checked meter using carrier communication in China's low-voltage network,
The MEC devices based on power electronics are installed in power distribution station transformer low voltage outgoing line side with reference to current state's net reducing energy consumption project.
After the direct linked network of MEC devices is installed, because device switching frequency is usually 10k-50kHZ scopes, the integral multiple switch that it is produced
Frequency noise signal can be added to by power line, and nearby (electric power narrowband carrier communication frequency mainly has carrier communication frequency band
120kHz, 270kHZ, 410kHZ etc.), interfering carrier communication so that success rate of checking meter decline, influence electric company check meter and
Meterage：(1) part electric company with daily platform area check meter qualification rate examination employee, so equipment must assure that do not influence
Platform area checks meter success rate；(2) the charge of electricity of electric company and energy data monitoring are counted and divided by backstage of checking meter
Analysis, economic benefit and user's vital interests are directly affected, the reliability in time of power carrier meter reading data must be pursued.Cause
This, solves the problems, such as that MEC plant runnings can influence platform area carrier meter reading, and practical, demand is urgent；It is technically to apply newly to ask
Topic, Scheme Choice and verification mode acquire a certain degree of difficulty, and the country there is no ripe scheme.
The content of the invention
The technical problems to be solved by the invention are to provide and a kind of solve reactive-load compensation equipment and cause power carrier to be checked meter to ask
The equipment of topic, can effectively solve installing the reactive-load compensation or three based on power electronics for the power distribution station of carrier communication
It is mutually uneven the problem that power carrier be caused after equipment to check meter success rate decline such as to automatically adjust.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：One kind solves reactive-load compensation equipment and causes power carrier
The equipment of problem of checking meter, MEC is connected on the circuit of the three-phase four-wire system between distribution transformer and user's electric energy meter
Device and carrier meter reading concentrator, including wave resistance device of checking meter, the wave resistance device of checking meter are connected with the MEC devices, and institute
State the three-phase four that MEC devices are connected between the carrier meter reading concentrator and user's electric energy meter by the wave resistance device of checking meter
On the circuit of line.
The beneficial effects of the invention are as follows：Power carrier is caused to be checked meter problem in a kind of solution reactive-load compensation equipment of the present invention
In equipment, wave resistance device of checking meter is connected with MEC devices, can suppress the high frequency letter of the influence carrier meter reading that MEC devices externally send
Number, influence power carrier to check meter problem such that it is able to improve success rate of checking meter, when solving MEC class device high volume applications, and
Industrialized implementation scheme is given, is conducive to power system reducing energy consumption and power distribution network to upgrade.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Further, the MEC devices include three-phase inversion module and filtration module, the input of the three-phase inversion module
It is both connected on the input of the wave resistance device of checking meter with output end, the input of the filtration module is connected to the three-phase
On common port between the input of the output end of inversion module and the wave resistance device of checking meter, the output end of the filtration module
It is connected on the common port between the input of the input of the three-phase inversion module and the wave resistance device of checking meter, it is described to copy
The output end of table wave resistance device is connected on the circuit of the three-phase four-wire system between distribution transformer and user's electric energy meter.Enter one
Step, the three-phase inversion module is provided with two, two three-phase inversion wired in parallel connections.
Beneficial effect using above-mentioned further scheme is：Two three-phase inversion wired in parallel connections, can improve
The power density and control performance of MEC devices.
Further, the three-phase inversion module includes three-phase inversion unit, capacitor cell, inductance unit and grid-connected buffering list
Unit,
The three-phase inversion unit includes closing open pipe T1-T6, the E poles of the switch transistor T 1 and the C poles of the switch transistor T 2
It is connected, the E poles of the switch transistor T 3 are extremely connected with the C of the switch transistor T 4, E poles and the switch transistor T 6 of the switch transistor T 5
C be extremely connected, the C poles of the switch transistor T 1 and the C poles of the switch transistor T 3, E poles and the switching tube of the switch transistor T 2
The E of T4 is extremely connected, the C poles of the switch transistor T 5 and the C poles of the switch transistor T 3, E poles and the switch of the switch transistor T 6
The E of pipe T4 is extremely connected, and is corresponded to respectively on the switch transistor T 1-T6 and is equipped with diode D1-D6, and the diode D1-D6 is just
The extremely corresponding E for being connected to the switch transistor T 1-T6 extremely goes up, and the negative pole correspondence of the diode D1-D6 is connected to the switching tube
The C of T1-T6 extremely goes up；
The capacitor cell includes the DC electrolysis electric capacity Cdc1-Cdc2 of series connection, the one of the DC electrolysis electric capacity Cdc1
The C that end is connected to the switch transistor T 5 extremely goes up, and the other end of the DC electrolysis electric capacity Cdc1 is connected to the DC electrolysis electricity
Hold on one end of Cdc2, the E that the other end of the DC electrolysis electric capacity Cdc2 is connected to the switch transistor T 6 extremely goes up；
The inductance unit includes inductance La, Lb and Lc, and one end of the inductance La is connected to switch transistor T 1 and switching tube
On common port between T2, one end of the inductance Lb is connected on the common port between switch transistor T 3 and switch transistor T 4, described
One end of inductance Lc is connected on the common port between switch transistor T 5 and switch transistor T 6, the other end of described inductance La, Lb and Lc
It is connected on the grid-connected buffer cell；
The grid-connected buffer cell includes buffer resistance Ra, buffer resistance Rc and three-phase output contactor KM, the three-phase
One end correspondence of output contactor KM is connected on described inductance La, Lb and Lc, the other end of the three-phase output contactor KM
It is connected on the input of the wave resistance device of checking meter, it is defeated with three-phase that one end of the buffer resistance Ra is connected to the inductance La
On the common port gone out between contactor KM, it is defeated that the other end of the buffer resistance Ra is connected to the three-phase by relay JDa
Go out contactor KM and the common port between wave resistance device of checking meter on, one end of the buffer resistance Rc be connected to the inductance Lc with
On common port between three-phase output contactor KM, the other end of the buffer resistance Rc is connected to described by relay JDc
On common port between three-phase output contactor KM and wave resistance device of checking meter.
Beneficial effect using above-mentioned further scheme is：Grid-connected buffer cell can avoid grid-connected moment three-phase inversion list
The DC electrolysis capacitance short-circuit characteristic of first DC side and cause the excessive problem of electric current.
Further, the wave resistance device of checking meter includes inductance LA, LB, LC and LN, one end pair of described inductance LA, LB and LC
That answers is connected on the three-phase output contactor KM, and described inductance LA, LB are corresponding with the other end of LC to be connected to distribution transformer
On three live wires of the three-phase four-wire system between device and user's electric energy meter, one end of the inductance LN is connected to the DC electrolysis
On common port between electric capacity Cdc1 and DC electrolysis electric capacity Cdc2, the other end of the inductance LN be connected to distribution transformer with
On the zero line of the three-phase four-wire system between user's electric energy meter.
Beneficial effect using above-mentioned further scheme is：Wave resistance device check meter according to series inductance and parasitic capacitance over the ground
Composition LC principle of lowpass filter can decay high-frequency interferencing signal, while it is excessive to limit electric current；Wave resistance device of checking meter in addition is compared
There is relatively low cost in wave arrestment is carried out using complex ways such as LC parallel connections, practical operation feasibility is high.
Further, the magnetic core of described inductance LA, LB, LC and LN is iron silicon magnetic core.
Beneficial effect using above-mentioned further scheme is：Iron silicon magnetic core, from magnetic flux NPF250060 high, it has 0~
Good magnetic conductivity-the temperature characterisitic of 400 degree Celsius ranges, being basically unchanged of magnetic flux density is special with good magnetic conductivity-frequency
Property, decay it is small, be lost small, stability it is high；Additionally, iron silicon magnetic core has good direct current biasing characteristic.
Further, the filtration module includes the three-phase resistance R3, three pole reactor L3 and the three phase capacitance C3 that are sequentially connected in series, and
It is right between the three-phase output contactor KM and inductance LA, LB and LC that three connection ends correspondence of the three-phase resistance R3 is connected to
On the common port answered, three connection ends of the three phase capacitance C3 are both connected to the DC electrolysis electric capacity Cdc1 and DC electrolysis
On common port between electric capacity Cdc2.Further, the MEC devices also include controller, and the controller is used to pass through light current
Control the work of the three-phase inversion module.
Beneficial effect using above-mentioned further scheme is：Controller is by three-phase inversion module described in vulnerabilities scan
The core of work, it is ensured that the normal operation of system.
Further, thermoregulator is additionally provided with the MEC devices, the thermoregulator is electrically connected with the controller
Connect, it is used under the control of the controller lower the temperature the MEC devices.
Beneficial effect using above-mentioned further scheme is：Thermoregulator can ensure MEC plant runnings in optimal shape
State, it is ensured that the reliability of system.
Brief description of the drawings
Fig. 1 be the present invention it is a kind of solve reactive-load compensation equipment cause power carrier check meter problem equipment structured flowchart
Figure；
Fig. 2 be the present invention it is a kind of solve reactive-load compensation equipment cause power carrier check meter problem equipment in MEC devices with
Check meter the specific connection block diagram of wave resistance device；
Fig. 3 be the present invention it is a kind of solve reactive-load compensation equipment cause power carrier check meter problem equipment circuit theory
Figure；
Fig. 4 is not use the N line interference noise figures that MEC devices are produced when checking meter wave resistance device in the prior art；
Fig. 5 be the present invention it is a kind of solve reactive-load compensation equipment cause power carrier check meter problem equipment using checking meter wave arrestment
The N line interference noise figures that MEC devices are produced during device.
Specific embodiment
Principle of the invention and feature are described below in conjunction with accompanying drawing, example is served only for explaining the present invention, and
It is non-for limiting the scope of the present invention.
As shown in figure 1, a kind of reactive-load compensation equipment that solves causes power carrier to be checked meter the equipment of problem, in distribution transformer
With MEC devices and carrier meter reading concentrator are connected on the circuit of the three-phase four-wire system between user's electric energy meter, including copy
Table wave resistance device, the wave resistance device of checking meter is connected with the MEC devices, and the MEC devices are filled by the wave arrestment of checking meter
Put on the circuit of the three-phase four-wire system being connected between the carrier meter reading concentrator and user's electric energy meter.Low-voltage network it is every
Ge Tai areas are the three-phase alternating currents that 380V is exported by a station power distribution transformer, and are A, B, C, N three-phase and four-line outlet method, defeated
The alternating current for going out is supplied to user load；In order to count each user power utilization situation and power quality data, match somebody with somebody by platform area
Nearby low-pressure side is installed in parallel a carrier meter reading concentrator for three-phase and four-line inlet wire to piezoelectric transformer, is used with installed in this area
Each user's electric energy meter timing of family end carries out carrier communication, completes power consumption data statistics, is then concentrated by carrier meter reading
Platform area user terminal power consumption data are uploaded device the management backstage number of O＆M department of electric company by modes such as GPRS communications
According to storehouse, the data support that basis and power supply management are safeguarded is paid for the electricity charge.Here, the power taking of user's electric energy meter and carrier wave
Communication is all taken from a phase line and zero line N in phase line A, B, C, and frequency of supply is low frequency 50HZ or so, carrier communication frequency
It is high frequency, 270kHZ or 421kHZ carrier communication frequencies is mainly in specific embodiment of the invention；Near carrier meter reading collection
On the low tension circuit of middle device and couple MEC devices (based on power electronics comprehensive power quality optimization device), MEC devices use
In the out-of-balance current of compensation load so that distribution transformer outlet side output current is presented three-phase equilibrium effect, plays protection
The purpose of distribution transformer safety and energy saving of system.When not possessing comprehensive wave arrestment function, because MEC devices are based on 10kHZ
The power electronic equipment of~50kHZ switching frequencies, the High-frequency Interference letter of switching frequency time integral multiple will be produced in plant running
Number, it is superimposed upon on power line, decay even upsets normal multicarrier communication signal so that the power carrier of carrier meter reading concentrator
Success rate of checking meter declines, less than 100%, therefore, the present invention also isolates interference by wave resistance device of checking meter, and completes energy-saving safe
Meanwhile, it is also equipped with system reliability.
In this specific embodiment, MEC devices are as follows with the concrete structure and annexation of wave resistance device of checking meter：
As shown in Fig. 2 the MEC devices include three-phase inversion module and filtration module, the three-phase inversion module it is defeated
Enter end and output end is both connected on the input of the wave resistance device of checking meter, the input of the filtration module is connected to described
On common port between the input of the output end of three-phase inversion module and the wave resistance device of checking meter, the filtration module it is defeated
Go out end to be connected on the common port between the input of the input of the three-phase inversion module and the wave resistance device of checking meter, institute
The output end for stating wave resistance device of checking meter is connected on the circuit of the three-phase four-wire system between distribution transformer and user's electric energy meter.Institute
State three-phase inversion module and be provided with two, two three-phase inversion wired in parallel connections.Two three are provided with this specific embodiment
Phase inversion module, two operation principles of three-phase inversion module can improve the power of MEC devices similar to track and field 2*100 meters
Density and control performance.Certainly, in other specific embodiment, a three-phase inversion mould also can be only included during practical application
Block.Three-phase inversion module is using phase-shifting carrier wave technology.
As shown in figure 3, the three-phase inversion module includes three-phase inversion unit, capacitor cell, inductance unit and grid-connected slow
Unit is rushed, the three-phase inversion unit includes closing open pipe T1-T6, the E poles of the switch transistor T 1 and the C poles phase of the switch transistor T 2
Even, the E poles of the switch transistor T 3 are extremely connected with the C of the switch transistor T 4, E poles and the switch transistor T 6 of the switch transistor T 5
C is extremely connected, the C poles of the switch transistor T 1 and the C poles of the switch transistor T 3, E poles and the switch transistor T 4 of the switch transistor T 2
E be extremely connected, the C poles of the switch transistor T 5 and the C poles of the switch transistor T 3, E poles and the switching tube of the switch transistor T 6
The E of T4 is extremely connected, and is corresponded to respectively on the switch transistor T 1-T6 and is equipped with diode D1-D6, the positive pole of the diode D1-D6
The E that correspondence is connected to the switch transistor T 1-T6 extremely goes up, and the negative pole correspondence of the diode D1-D6 is connected to the switch transistor T 1-
The C of T6 extremely goes up；The capacitor cell includes the DC electrolysis electric capacity Cdc1-Cdc2 of series connection, the DC electrolysis electric capacity Cdc1's
The C that one end is connected to the switch transistor T 5 extremely goes up, and the other end of the DC electrolysis electric capacity Cdc1 is connected to the DC electrolysis
On one end of electric capacity Cdc2, the E that the other end of the DC electrolysis electric capacity Cdc2 is connected to the switch transistor T 6 extremely goes up；The electricity
Sense unit includes inductance La, Lb and Lc, and one end of the inductance La is connected to the common port between switch transistor T 1 and switch transistor T 2
On, one end of the inductance Lb is connected on the common port between switch transistor T 3 and switch transistor T 4, and one end of the inductance Lc connects
It is connected on the common port between switch transistor T 5 and switch transistor T 6, the other end of described inductance La, Lb and Lc is connected to described grid-connected
On buffer cell；The grid-connected buffer cell includes buffer resistance Ra, buffer resistance Rc and three-phase output contactor KM, described three
One end correspondence of phase output contactor KM is connected on described inductance La, Lb and Lc, and the three-phase output contactor KM's is another
End is connected on the input of the wave resistance device of checking meter, and one end of the buffer resistance Ra is connected to the inductance La and three-phase
On common port between output contactor KM, the other end of the buffer resistance Ra is connected to the three-phase by relay JDa
On common port between output contactor KM and wave resistance device of checking meter, one end of the buffer resistance Rc is connected to the inductance Lc
On the common port between three-phase output contactor KM, the other end of the buffer resistance Rc is connected to institute by relay JDc
State three-phase output contactor KM and the common port between wave resistance device of checking meter on.In the system of the present invention, mainly by inductance
Unit realize voltage source inverter control grid-connected current, realized by contactor KM it is grid-connected, by resistance Ra, Rc, relay JDa
Realize in grid-connected buffering electricity with relay JDc, it is to avoid grid-connected moment DC electrolysis capacitance short-circuit and cause that electric current is excessive to ask
Topic.
As shown in figure 3, the wave resistance device of checking meter includes inductance LA, LB, LC and LN, the one of described inductance LA, LB and LC
End is corresponding to be connected on the three-phase output contactor KM, and described inductance LA, LB are corresponding with the other end of LC to be connected to distribution
On three live wires of the three-phase four-wire system between transformer and user's electric energy meter, one end of the inductance LN is connected to the direct current
On common port between electrochemical capacitor Cdc1 and DC electrolysis electric capacity Cdc2, the other end of the inductance LN is connected to distribution transformer
On the zero line of the three-phase four-wire system between device and user's electric energy meter.Wave resistance device of checking meter passes through series inductance and over the ground parasitic capacitance
Composition LC principle of lowpass filter can decay high-frequency interferencing signal, while it is excessive to limit electric current.Wherein, checking meter wave resistance device can be with
It is an integrating device being composed in series by two three-phase and four-line inductance, or is integrated in by a phase three-wire three inductance
MEC devices inside and a N lines inductance are arranged on the Split type device that the outside of MEC devices constitutes.In wave resistance device of checking meter, institute
The magnetic core for stating inductance LA, LB, LC and LN must be chosen to iron silicon magnetic core, and specifically from magnetic flux NPF250060 high, it has 0~
Good magnetic conductivity-the temperature characterisitic of 400 degree Celsius ranges, being basically unchanged of magnetic flux density；And with good magnetic conductivity-frequency
Rate characteristic, decays minimum；It is smaller more stable compared to traditional iron powder core loss；And ferrite core is also very serious decay,
This occasion is not applied to；Additionally, iron silicon magnetic core has good direct current biasing characteristic, present example D.C. resistance is controlled in 10 milliohms
Within；In the inductance parameters for checking meter wave resistance device, phase line inductance value combination filtering requirements are controlled between 70uH~400uH,
It is too small to cause and inductance value is bigger, and from suppressing, the upper effect of interference is better but too big to cause overcurrent protection and the loss bigger than normal
Inhibition is weak；And should be main to filter based on DM EMI, and inductance LA, LB, LC and LN use respective magnetic core, do not share.
As shown in figure 3, the filtration module includes the three-phase resistance R3, three pole reactor L3 and the three phase capacitance that are sequentially connected in series
C3, and three connection ends correspondence of the three-phase resistance R3 is connected to the three-phase output contactor KM and inductance LA, LB and LC
Between on corresponding common port, three connection ends of the three phase capacitance C3 are both connected to the DC electrolysis electric capacity Cdc1 and straight
On common port between stream electrochemical capacitor Cdc2.
In this specific embodiment, the MEC devices also include controller, and the controller is used to pass through vulnerabilities scan institute
State the work of three-phase inversion module.Thermoregulator, the thermoregulator and the controller are additionally provided with the MEC devices
Electrical connection, it is used under the control of the controller lower the temperature the MEC devices.Thermoregulator includes fan control
With two functions of temperature detection, when temperature is too high, higher than thermoregulator set temperature limit when, start fan running, enter
Row exhausting, realizes cooling, otherwise controls fan not work；Temperature limiting is set in typical temperature adjuster at 50 degrees Celsius.
In the present invention, the controller in MEC devices is the core by three-phase inversion cell operation in vulnerabilities scan forceful electric power
The heart.Thermoregulator is connected by 485 or digital switch quantity with the controller of MEC modules, is carried out by the controller of MEC modules
Status monitoring is digital control.Wave resistance device of checking meter is connected with MEC devices, can suppress the influence carrier wave that MEC devices externally send
The high-frequency signal checked meter, so as to realize improving the effect of success rate of checking meter.
Fig. 4 is not use the N line interference noise figures that MEC devices are produced when checking meter wave resistance device in the prior art.Such as Fig. 4 institutes
Show, do not use when checking meter wave resistance device, by LISN (abbreviation of Line Impedance Stabilization Network,
That is line impedance stabilization net work, LISN is an important auxiliary equipment in electromagnetic compatibility test in power system, and it can be every
From wave interference, there is provided stabilization Impedance measurement, and play a part of filtering) string on power network electric wire test MEC devices send
Disturbed condition；Wherein 1. for carrier meter reading concentrator is checked meter successful limits value, by actual measurement, MEC devices send fixed 5A
During reactive current, 1. noise amplitude exceedes, and average interference amplitude is 92.5dBuV on 270kHZ Frequency point N lines, and 420kHZ is frequently
Average interference amplitude is 96.5dBuV on rate point N lines, can be had a strong impact on from waveform and in amplitude and checked meter；It is actual to use one piece
Ancient cooking vessel believes 421kHZ carrier meter readings concentrator and 6 pieces of electric energy meter reading terminal checkings, and one piece plus 74dB attenuators, as a result all checks meter
Failure.
Fig. 5 be the present invention it is a kind of solve reactive-load compensation equipment cause power carrier check meter problem equipment using checking meter wave arrestment
The N line interference noise figures that MEC devices are produced during device.As shown in figure 5, using check meter wave resistance device when, by LISN go here and there in electricity
The disturbed condition that MEC devices send is tested on net electric wire；Wherein 1. for carrier meter reading concentrator is checked meter successful limits value.Pass through
When actual measurement MEC devices send fixed 5A reactive currents, average noise amplitude is below red line safety line；And 270kHZ Frequency points N
Average interference amplitude is 32.45dBuV on line, and average interference amplitude is 49.42dBuV on 420kHZ Frequency point N lines, from waveform
Checked meter with will not be had a strong impact in amplitude；It is actual to be checked meter with 6 blocks of electric energy using one piece of ancient cooking vessel letter 421kHZ carrier meter readings concentrator
Terminal authentication, and one piece plus 74dB attenuators, as a result all check meter successfully, success rate 100%；And copied by 270kHZ carrier waves
Biao Tai areas scene and 421kHZ carrier meter reading platforms area on-site verification realize success rate 100% of checking meter.
In the present invention, the basic reason of influence carrier meter reading is DM EMI, and interference passes through live wire and zero line.With reference to electricity
Power carrier meter reading concentrator principle and LISN test waveforms, and actual verification, individually still can not thoroughly solve in zero line string inductance
The carrier communication interference problem that certainly MEC devices cause, it is necessary to filter carrier frequency interference signal simultaneously with reference to phase line and zero line.
According to the requirement of MEC devices output signal frequency and parasitic capacitance, selection is checked meter the scope of inductance value in wave resistance device.
According to LC low pass filter cutoff frequency equation selection parameters：
In actual implementation, inductance value L=70uH~400uH in wave resistance device of checking meter can be chosen.
In the selection of the inductance core material of wave resistance device of checking meter, it is considered to which application scenario, frequency, temperature and load current are comprehensive
Conjunction is selected and by actual verification.
The present invention is, by comprehensive analysis carrier-in-interference question classification, to solve MEC devices with cost performance scheme high and cause
Problem of checking meter, practical operation feasibility is high, and reliability is also ensure that by temperature control；Also solving MEC classes device high-volume should
Used time influence power carrier is checked meter problem, and provides industrialized implementation scheme, is conducive to power system reducing energy consumption and power distribution network
Upgrading.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (9)
1. a kind of reactive-load compensation equipment that solves causes power carrier to be checked meter the equipment of problem, in distribution transformer and user's electric energy meter
Between three-phase four-wire system circuit on be connected to MEC devices and carrier meter reading concentrator, it is characterised in that：Including checking meter
Wave resistance device, the wave resistance device of checking meter is connected with the MEC devices, and the MEC devices are by the wave resistance device of checking meter
On the circuit of the three-phase four-wire system being connected between the carrier meter reading concentrator and user's electric energy meter.
2. a kind of reactive-load compensation equipment that solves according to claim 1 causes power carrier to be checked meter the equipment of problem, and it is special
Levy and be：The MEC devices include three-phase inversion module and filtration module, the input and output end of the three-phase inversion module
It is both connected on the input of the wave resistance device of checking meter, the input of the filtration module is connected to the three-phase inversion module
Output end and the input of the wave resistance device of checking meter between common port on, the output end of the filtration module is connected to institute
State on the common port between the input of the input of three-phase inversion module and the wave resistance device of checking meter, the wave arrestment dress of checking meter
The output end put is connected on the circuit of the three-phase four-wire system between distribution transformer and user's electric energy meter.
3. a kind of reactive-load compensation equipment that solves according to claim 2 causes power carrier to be checked meter the equipment of problem, and it is special
Levy and be：The three-phase inversion module is provided with two, two three-phase inversion wired in parallel connections.
4. a kind of solution reactive-load compensation equipment according to Claims 2 or 3 causes power carrier to be checked meter the equipment of problem, its
It is characterised by：The three-phase inversion module includes three-phase inversion unit, capacitor cell, inductance unit and grid-connected buffer cell,
The three-phase inversion unit includes closing open pipe T1-T6, and the E poles of the switch transistor T 1 are extremely connected with the C of the switch transistor T 2,
The E poles of the switch transistor T 3 are extremely connected with the C of the switch transistor T 4, the E poles of the switch transistor T 5 and the C poles of the switch transistor T 6
It is connected, the C poles of the switch transistor T 1 and the C poles of the switch transistor T 3, the E poles of the switch transistor T 2 and the E of the switch transistor T 4
Extremely it is connected, the C poles of the switch transistor T 5 and the C poles of the switch transistor T 3, E poles and the switch transistor T 4 of the switch transistor T 6
E is extremely connected, and corresponds to the positive pole correspondence for being equipped with diode D1-D6, the diode D1-D6 on the switch transistor T 1-T6 respectively
The E for being connected to the switch transistor T 1-T6 extremely goes up, and the negative pole correspondence of the diode D1-D6 is connected to the switch transistor T 1-T6's
C extremely goes up；
The capacitor cell includes that one end of DC electrolysis the electric capacity Cdc1-Cdc2, the DC electrolysis electric capacity Cdc1 of series connection connect
The C for being connected on the switch transistor T 5 extremely goes up, and the other end of the DC electrolysis electric capacity Cdc1 is connected to the DC electrolysis electric capacity
On one end of Cdc2, the E that the other end of the DC electrolysis electric capacity Cdc2 is connected to the switch transistor T 6 extremely goes up；
The inductance unit includes inductance La, Lb and Lc, one end of the inductance La be connected to switch transistor T 1 and switch transistor T 2 it
Between common port on, one end of the inductance Lb is connected on the common port between switch transistor T 3 and switch transistor T 4, the inductance
One end of Lc is connected on the common port between switch transistor T 5 and switch transistor T 6, the other end connection of described inductance La, Lb and Lc
On the grid-connected buffer cell；
The grid-connected buffer cell includes buffer resistance Ra, buffer resistance Rc and three-phase output contactor KM, the three-phase output
One end correspondence of contactor KM is connected on described inductance La, Lb and Lc, the other end connection of the three-phase output contactor KM
On the input for checking meter wave resistance device, one end of the buffer resistance Ra is connected to the inductance La and is connect with three-phase output
On common port between tentaculum KM, the other end of the buffer resistance Ra is connected to the three-phase output and connects by relay JDa
On common port between tentaculum KM and wave resistance device of checking meter, one end of the buffer resistance Rc is connected to the inductance Lc and three-phase
On common port between output contactor KM, the other end of the buffer resistance Rc is connected to the three-phase by relay JDc
On common port between output contactor KM and wave resistance device of checking meter.
5. a kind of reactive-load compensation equipment that solves according to claim 4 causes power carrier to be checked meter the equipment of problem, and it is special
Levy and be：The wave resistance device of checking meter includes inductance LA, LB, LC and LN, the corresponding connection in one end of described inductance LA, LB and LC
On the three-phase output contactor KM, the other end correspondence of described inductance LA, LB and LC is connected to distribution transformer and user
On three live wires of the three-phase four-wire system between electric energy meter, one end of the inductance LN is connected to the DC electrolysis electric capacity Cdc1
And on the common port between DC electrolysis electric capacity Cdc2, the other end of the inductance LN is connected to distribution transformer and user's electric energy
On the zero line of the three-phase four-wire system between table.
6. a kind of reactive-load compensation equipment that solves according to claim 5 causes power carrier to be checked meter the equipment of problem, and it is special
Levy and be：The magnetic core of described inductance LA, LB, LC and LN is iron silicon magnetic core.
7. a kind of reactive-load compensation equipment that solves according to claim 6 causes power carrier to be checked meter the equipment of problem, and it is special
Levy and be：The filtration module includes the three-phase resistance R3, three pole reactor L3 and the three phase capacitance C3 that are sequentially connected in series, and the three-phase
It is corresponding between inductance LA, LB and LC public that three connection ends correspondence of resistance R3 is connected to the three-phase output contactor KM
On end, three connection ends of the three phase capacitance C3 are both connected to the DC electrolysis electric capacity Cdc1 and DC electrolysis electric capacity Cdc2
Between common port on.
8. a kind of reactive-load compensation equipment that solves according to claim 4 causes power carrier to be checked meter the equipment of problem, and it is special
Levy and be：The MEC devices also include controller, and the controller is used for by the work of three-phase inversion module described in vulnerabilities scan
Make.
9. a kind of reactive-load compensation equipment that solves according to claim 8 causes power carrier to be checked meter the equipment of problem, and it is special
Levy and be：Thermoregulator is additionally provided with the MEC devices, the thermoregulator is electrically connected with the controller, and it is used for
The MEC devices are lowered the temperature under the control of the controller.
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| CN108183727A (en) * | 2017-12-08 | 2018-06-19 | 囯网河北省电力有限公司电力科学研究院 | Power information interference signal filter, power information acquisition system and method |
| CN109444789A (en) * | 2018-10-09 | 2019-03-08 | 国网湖北省电力有限公司宜昌供电公司 | A kind of Electricity customers and electric energy meter relation recognition device and method |
| CN109524966A (en) * | 2019-01-04 | 2019-03-26 | 江苏谷峰电力科技股份有限公司 | A kind of New Fusion microgrid filter benefit device |
| CN111585615A (en) * | 2020-04-17 | 2020-08-25 | 华北电力大学（保定） | Direct current energy supply method |
| CN112787689A (en) * | 2021-01-27 | 2021-05-11 | 广东电网有限责任公司 | Power line carrier same-frequency noise blocker and power system |
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