CN108429262A - A kind of novel power quality protection system - Google Patents
A kind of novel power quality protection system Download PDFInfo
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- CN108429262A CN108429262A CN201810288907.0A CN201810288907A CN108429262A CN 108429262 A CN108429262 A CN 108429262A CN 201810288907 A CN201810288907 A CN 201810288907A CN 108429262 A CN108429262 A CN 108429262A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E40/20—Active power filtering [APF]
-
- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The application discloses a kind of novel power quality protection system, is related to electric energy optimizing field, including filter module, compensating module, relay protection module, monitoring module；Novel power quality in the present embodiment protects system cooperating by aforementioned four Main functional units so that system can improve power factor, reduce harmonic distortion, solve three-phase imbalance, voltage fluctuation flickering.The power quality protection system of the utility model solve traditional power quality protection system rejection to disturbance poor performance, reliability it is low, in terms of the protection to large-size machine; protection domain and actuation time can be limited by electric motor starting electric current; caused by protection domain it is excessive, cannot reliably ensure several point devices safety etc. technical problems.
Description
Technical field
This application involves electric energy optimizing technical field, more particularly to a kind of power quality protects system.
Background technology
Traditional power quality protection system be using it is high-power can turn-off type power electronic technique, quickly can continuously mend
Repay it is idle, accurately control system voltage and power factor, filter out electric harmonic power conditioner, the balance functions such as three-phase load, can
Line loss is effectively reduced, power equipment service life is extended, solves idle, harmonic wave, voltage fluctuation and three-phase in distribution
The power quality problems such as imbalance.
But existing power quality protects system, jamproof performance is poor, is easy to be done by other force devices
It disturbs；Meanwhile adverse circumstances are not adapted to, reliability is low, and force device in the power system notifies watch after breaking down
The range of member is smaller, and operator on duty cannot have found the significant trouble of the force device or electric system in electric system in time；It is right
It guarantees safe production, safety utilization of electric power occupies critically important status, in terms of for the protection to large and middle size motor, protection domain
Can all be limited by electric motor starting electric current with actuation time, be not that protection domain is excessive, be exactly actuation time it is too long so that not
It can reliably ensure the safety of electromechanical equipment, and cause unnecessary loss.
Invention content
The main purpose of the application is to provide a kind of novel power quality protection system, to solve traditional electric energy at present
Quality protection system rejection to disturbance poor performance, reliability be low, in terms of the protection to large-size machine, protection domain and actuation time meeting
Limited by electric motor starting electric current, caused by protection domain it is excessive, cannot reliably ensure several point devices safety etc. skills
Art problem.
In order to realize application purpose, this application provides a kind of novel power qualities to protect system, including filter mould
Block, compensating module, relay protection module, monitoring module；
Wherein, the filter module for detecting the harmonic current for loading generation on power grid in real time, and is generated and is loaded
Harmonic wave is equal, opposite in phase compensation electric current is applied to power grid, to offset harmonic current；
The compensating module, for realizing reactive-load compensation, harmonic wave control using shunt capacitance reactance switching mode and putting down
Weigh three-phase load, and the compensating module includes active filter APF and static reactive generator SVG；
The relay protection module includes transformation compensating unit, thresholding discriminating unit, control output unit；The transformation is mended
Unit is repaid, for the electric current of input to be changed into linear analog DC voltage；The thresholding discriminating unit by logic gates,
Thresholding discriminator circuit forms；The control output unit is made of protection output, warning output；
The monitoring module for realizing the real time monitoring to power quality, and is managed and protects to power quality；
The monitoring module includes mutual inductance device, A/D sampling units, data processing unit, communication unit.
Preferably, the filter module is used from changing bridge circuit and is connected in parallel on the cable of power grid by reactor,
Three-phase current harmonic wave is acquired specifically for passing through the cable, and according to one reverse current of the three-phase current harmonic generation
Harmonic wave feeds back to the compensating module.
Preferably, the filter module is the three-phase controllable current source using wavelet neural network denoising method.
Preferably, the APF and SVG uses shunt compensation mode, the compensating module to be connected to the filter module,
Corresponding thermal compensation signal, the compensation are generated specifically for being detected to harmonic signal, and according to the harmonic signal detected
Module includes Harmonic currents detection unit, hysteretic loop current control unit, the parallel compensation unit being made of the APF and SVG.
Preferably, the input terminal of the transformation compensating unit is connected to the cable that load is connected on power grid, and being used for will
The three-phase current of input is converted to linear analog DC voltage, and in the analog DC voltage beyond in permission variation range
When, carry out voltage compensation；The thresholding discriminating unit, for flowing through the analog DC voltage from the transformation compensating unit
Upper limit gate circuit, the lower limit gate circuit of the logic gates obtain the maximum value in the three-phase current and minimum value, and will
The maximum value determines that door inputs in order to control, and the minimum value is determined as phase shortage door and unloaded gate inputs；Control output unit
It is made of flip and flop generator and SCR chopper, the warning output uses the sensitive relay of transistor controls.
Preferably, the thresholding discriminating unit uses the switching circuit controlled by input current.
Preferably, the speed regulating control unit, the mutual inductance device are specifically used for carrying out the electric signal on the power grid
Drop stream or decompression, to make the electric signal can be used for data processing；The A/D sampling units are specifically used for flowing the drop
Or the electric signal of decompression is sampled；The data processing unit is specifically used for calculating the electric signal after sampling into row index,
So that whether the power transmission determined in the power grid breaks down；The communication unit is specifically used for the knot after calculating index
Fruit feeds back to monitoring client.
A kind of novel power quality provided by the present application protects system, and system phase is protected with power quality traditional at present
Than the power quality protection system of the utility model detects the harmonic current on power grid by filter module, and generates compensation electric current
It is applied in power grid, realizes optimization power quality, compensating module realizes reactive-load compensation, humorous using APF and SVG combinations
Wave is administered, balances three-phase load, three-phase protective, overcurrent protection is realized by relay protection module, to there are abnormal conditions
Lower carry out warning output, the historical record of power quality is provided finally by monitoring module for the monitoring personnel of electric system, with
Just analytical judgment is made.The power quality protection system of the utility model solves traditional power quality protection system rejection to disturbance performance
Difference, reliability it is low, in terms of the protection to large-size machine, protection domain and actuation time can be limited by electric motor starting electric current
System, caused by protection domain it is excessive, cannot reliably ensure the technical problems such as the safety of several point devices, be a kind of to electric energy matter
The system optimized is measured, which can improve power factor, reduce harmonic distortion, solve three-phase imbalance, voltage fluctuation sudden strain of a muscle
Become.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of novel power quality protection system in the embodiment of the present application；
Fig. 2 is the structural schematic diagram of compensating module in the embodiment of the present application；
Fig. 3 is compensating module hardware architecture diagram in the embodiment of the present application；
Fig. 4 is the structural schematic diagram of monitoring module in the embodiment of the present application；
Fig. 5 is monitoring module hardware architecture diagram in the embodiment of the present application.
The embodiments will be further described with reference to the accompanying drawings for realization, functional characteristics and the advantage of the application purpose.
Specific implementation mode
It should be appreciated that specific embodiment described herein is used only for explaining the application, it is not used to limit the application.
In order to overcome, traditional power quality protects system for bad environments, interference is strong and large and middle size motor exists at present
The shortcomings that in terms of power quality protection.The embodiment of the present application provides a kind of novel power quality protection system, such as Fig. 1 institutes
Show, is the structural schematic diagram that power quality novel in the embodiment of the present application protects system, including including filter module 11, benefit
Repay module 12, relay protection module 13, monitoring module 14.
The filter module 11 for detecting the harmonic current for loading generation on power grid in real time, and generates humorous with load
Wave is equal, opposite in phase compensation electric current is applied to power grid, to offset harmonic current, wherein in the filter module 11
Three-phase controllable current source can be taken, when filter module 11 is connected to power grid, may be used and pass through electricity from changing bridge circuit
Anti- device is connected in parallel on the cable of power grid, changes the bridge circuit that bridge circuit is made of 4 diodes certainly, automatic to realize
Commutation.Filter module 11 generates one instead by acquiring three-phase current harmonic wave from cable, by three-phase controllable current source
To current harmonics carry out the current harmonics in bucking-out system, to the current harmonic content in reduction system.In addition, due to electric power
The voltage harmonic of system is that current harmonics acts on generated harmonic voltage on power system impedance, which is added to
On power system voltage, the sine voltage of rule can be made to send distortion, therefore, when the current harmonic content drop in electric system
After low, the voltage harmonic content in current system will reduce simultaneously.
Preferably, since the noise in electric system on power line distinguishes non-artificial noise and man-made noise, and impedance
Decay all generate electric signal quality caused by variation and transmission line and seriously affect, in order to reduce noise, reduce circuit
Impedance avoids electric signal decaying, reduces interference, using the method for wavelet neural network denoising, is added in filter module 11
Denoising to electric energy quality signal, the threshold value of selection Wavelet Denoising Method Decomposition order and Wavelet Denoising Method that can be adaptive, from
And the noise of electric energy quality signal is effectively removed, and can preferably retain the information of electric energy quality signal mutation.
The compensating module 12, for using shunt capacitance reactance switching mode realize reactive-load compensation, harmonic wave control and
Three-phase load is balanced, the compensating module includes active filter APF and static reactive generator SVG.Wherein, by using
Shunt capacitance reactance switching mode refers to being linked into compensating module by capacity reactance in parallel, and in order to solve load
It is steady whether, the height difference of power factor, harmonic wave size and voltage balance whether, using APF and SVG combinations,
Reactive-load compensation is concentrated using SVG in high-pressure side and administers harmonic wave, harmonic wave is administered using APF near important equipment, production line.
The relay protection module 13 includes transformation compensating unit, thresholding discriminating unit, control output unit；The transformation
Compensating unit, for the electric current of input to be changed into linear analog DC voltage；The thresholding discriminating unit is by logic gate electricity
Road, thresholding discriminator circuit composition；The control output unit is made of protection output, warning output.Wherein, due to relay protection
The input signal of module 13 is three-phase current, and to meet the input demand of discriminator circuit, electricity will be inputted by converting compensating unit
Circulation changes linear analog DC voltage into, and according to the overcurrent for differentiating threshold and controlling output unit in thresholding discriminating unit
The range of needs of protection determines the transformation coefficient with input current, to obtain the analog voltage of certain amplitude.In addition, relay
Protection module 13 can determine overcurrent protection and alarm threshold by thresholding discriminating unit, and by control output unit into
Row alarm.
The monitoring module 14 for realizing the real time monitoring to power quality, and is managed and protects to power quality
Shield；The monitoring module includes mutual inductance device, A/D sampling units, data processing unit, communication unit.Wherein, monitoring module 14
The normal operation of power quality can be monitored by connecting monitoring interface, include the operations such as fault diagnosis, decision, pipe
Reason person can be set by the specific detection parameters prompted in monitored picture, and by current new electric energy quality protection system
System generates new sample data, so that administrator checks, to carry out data analysis to new sample data, as network is instructed
Practice etc..
Novel power quality in the present embodiment protects system cooperating by aforementioned four Main functional units,
System is enable to improve power factor, reduce harmonic distortion, solve three-phase imbalance, voltage fluctuation flickering.The electric energy of the utility model
Quality protection system solve traditional power quality protection system rejection to disturbance poor performance, reliability it is low, in the guarantor to large-size machine
In terms of shield, protection domain and actuation time can be limited by electric motor starting electric current, caused by protection domain it is excessive, Bu Nengke
The technical problems such as the safety of several point devices are ensured by ground.
Illustrate the concrete structure of the power quality protection system each unit of the utility model below, it is preferred that as shown in Fig. 2, mending
The APF and SVG repaid in module 12 uses shunt compensation mode, specifically includes：Harmonic currents detection unit 1201, hysteresis current control
Unit 1202 processed, the parallel compensation unit 1203 being made of the APF and SVG.Wherein, Harmonic currents detection unit 1201 is defeated
Outlet accesses the input terminal of hysteretic loop current control unit 1202, and the output end of hysteretic loop current control unit 1202 accesses shunt compensation
The input terminal of unit 1203 to realize the detection to harmonic signal, and generates corresponding benefit according to the harmonic signal detected
Repay signal.In addition, for the method that capacitive coupling carries out three-phase imbalance adjustment, it is difficult due to the variability of power system load
It is poor to the control effect of degree of unbalancedness to match suitable capacitive coupling, it is examined using the harmonic current in the present embodiment
Surveying unit 1201, hysteretic loop current control unit 1202, the parallel compensation unit 1203 that is made of the APF and SVG can play
Improvement result, to realize that the device using low cost solves the problems, such as reactive-load compensation, balance three-phase.Entity hardware configuration is as schemed
Shown in 3.
Preferably, defeated including transformation compensating unit 1301, thresholding discriminating unit 1302, control due to relay protection module 13
Go out unit 1303, convert the connection structure between compensating unit 1301, thresholding discriminating unit 1302, control output unit 1303,
As shown in figure 3, the input terminal of the transformation compensating unit 1301 is connected to the cable for being connected to load on power grid, being used for will be defeated
The three-phase current entered is converted to linear analog DC voltage, and in the analog DC voltage beyond in permission variation range
When, carry out voltage compensation；Wherein, transformation compensating unit 1301 subtracts analog DC voltage, then divided by simulation by overcurrent threshold
DC voltage, you can to obtain the permission variation range of input current, and voltage fluctuation is reduced by adding voltage compensation device
Caused by influence, meanwhile, only when voltage change is excessive, can just run off threshold output.
Preferably, the thresholding discriminating unit 1302, being used for will be from the analog DC of the transformation compensating unit 1301
Voltage flows through the upper limit gate circuit of the logic gates, lower limit gate circuit, obtains maximum value in the three-phase current and most
Small value, and the maximum value is determined that door inputs in order to control, the minimum value is determined as phase shortage door and unloaded gate inputs.Its
In, since voltage compensation is mainly used for overcurrent protection and lower limit alarm threshold, as judge electric current whether there is or not control door and phase shortage
Door, it is thus only necessary to by electric current effectively without voltage compensation.Thresholding discriminator circuit can be one by input current control
Switching circuit, since the threshold value of switching circuit is very low, and input is the maximum value in three-phase current, ensures that switch
Circuit is switched on and off, and has ensured the normal work of the power quality protection system of the utility model.For example, when input current is 0,
Electronic switching circuit is closed, and current power quality protects system, does not export, as long as when input current is more than 0, analog DC electricity
Pressure is more than specified value, and electronic switching circuit is opened, and current power quality protection system starts to export.
In the embodiment of the power quality protection system of the utility model, phase shortage, zero load and overcurrent are that three thresholdings differentiate door,
The revolution electric current of motor can be in turn divided into shutdown (i.e. phase shortage), zero load, normal and four ranges of overcurrent, normally transported
Turn electric current maximum value and minimum value all in normal range (NR), when running off the upper limit or lower limit, that is, have corresponding output.Wherein,
The thresholding of phase shortage door is identical as control door, and output condition is less than thresholding rather than is more than thresholding just with control door on the contrary, i.e. input
Have output, also, the input of phase shortage door is minimum value in three-phase current rather than maximum value, be ensure that in network system
When load motor phase shortage, phase shortage output can be reliably carried out.And unloaded thresholding is the adjustable lower limit door of electric current, if load electricity
Electromechanics stream is just slightly below lower limit door, forms unloaded gate, then lower limit door can be as the lower limit required nominal load to control
Output unit 1303 processed sends signal, to alarm.
In the embodiment of the power quality protection system of the utility model, control output unit 1303 is by flip and flop generator and can
Silicon breaker composition is controlled, the warning output uses the sensitive relay of transistor controls.In order to avoid just in starting current pair
The limitation of overcurrent limits, while other not being made to be output to the influence of door opening delay again, phase shortage operating can all burn out load at any time
Possibility realize that novel power quality protection system can therefore, it is necessary to carry out stopping alarm by controlling output unit 1303
To bear overcurrent impact in a short time, the output time of relay protection is suitably adjusted, and single by the way that output time adjusting is arranged
Member, more flexible effective realization protection and alarm.In addition, the power quality protection system of the utility model can be exported by controlling
Unit 1303 utilizes the output signal from phase shortage or overcurrent protection, triggers flip and flop generator, makes its overturning, silicon-controlled open circuit
Silicon-controlled in device is become ending from conducting, to directly cut off the control power supply of load.Meanwhile the bistable state triggering after overturning
Device extinguishes indicator light, exports light signal, and alarm by warning output.The report of the power quality protection system of the utility model
Alert output is the sensitive mini-relay of a transistor controls, if in non-protected output state, i.e., when lower limit is alarmed, is being inputted
After revocation, alarm also voluntarily cancels.
Preferably, as shown in figure 4, the monitoring module 14 includes mutual inductance device 1401, A/D sampling units 1402, data
Processing unit 1403, communication unit 1404, the mutual inductance device 1401 are specifically used for dropping the electric signal on the power grid
Stream or decompression, to make the electric signal can be used for data processing；The A/D sampling units 1402 are specifically used for the drop
Stream or the electric signal of decompression are sampled；The data processing unit 1403 is specifically used for the electric signal after sampling into row index
It calculates, so that whether the power transmission determined in the power grid breaks down；The communication unit 1404 is specifically used for index
Result after calculating feeds back to monitoring client.Wherein, it is connected on power grid by mutual inductance device 1401, passes through A/D sampling units
1402 pairs of electric signals sample, and to access in data processing unit 1403, the output of data processing unit 1403 terminates
Entering to communication unit 1404, being communicated to client with will pass through network connection.
The power quality of the utility model protects system, and the monitoring interface in monitoring module 14 can be to power quality normal operation
State is monitored, wherein fault diagnosis, decision and the operations such as is exited and is required for carrying out activation trigger.Entity hardware configuration is such as
Shown in Fig. 5.
Condition monitoring interface has a function being monitored to power quality normal operating condition, wherein fault diagnosis, certainly
Plan and exit button need to activate, and administrator can be detected the setting of parameter according to the prompt occurred in picture, and by being
System generates new samples data, and administrator carries out button click, to make new samples data be added in training sample collection.
In addition, administrator can also be transferred by the sample set of network training to consult historical record, to the historical stage of electric energy operation
It tests.In systems, internal system can carry out the summary of operating status using time sequencing, and for the abnormal feelings in part
Condition makes analysis and judgement, can ensure to be more clear during management and protection so bright and clear.
It is abnormal that novel power quality protection system in the present embodiment enables system to improve power factor, reduction harmonic wave
Become, solve three-phase imbalance, voltage fluctuation flickering.The power quality protection system of the utility model solves traditional power quality protection
System rejection to disturbance poor performance, reliability be low, in terms of the protection to large-size machine, and protection domain and actuation time can be by motors
The limitation of starting current, caused by protection domain it is excessive, cannot reliably ensure several point devices safety etc. technical problems.
The preferred embodiment that these are only the application is not intended to limit the scope of the claims of the application, every to utilize this Shen
Please equivalent structure or equivalent flow shift made by specification and accompanying drawing content, be applied directly or indirectly in other relevant skills
Art field includes similarly in the scope of patent protection of the application.
Claims (7)
1. a kind of novel power quality protects system, which is characterized in that including filter module, compensating module, relay protection
Module, monitoring module；
Wherein, the filter module, for detecting the harmonic current for loading generation on power grid, and generation and load harmonic in real time
Equal, opposite in phase compensation electric current is applied to power grid, to offset harmonic current；
The compensating module, for realizing reactive-load compensation, harmonic wave control and balance three using shunt capacitance reactance switching mode
Phase load, the compensating module include active filter APF and static reactive generator SVG；
The relay protection module includes transformation compensating unit, thresholding discriminating unit, control output unit；The transformation compensation is single
Member, for the electric current of input to be changed into linear analog DC voltage；The thresholding discriminating unit is by logic gates, thresholding
Discriminator circuit forms；The control output unit is made of protection output, warning output；
The monitoring module for realizing the real time monitoring to power quality, and is managed and protects to power quality；It is described
Monitoring module includes mutual inductance device, A/D sampling units, data processing unit, communication unit.
2. system according to claim 1, which is characterized in that the filter module is using changing bridge circuit passes through electricity certainly
Anti- device is connected in parallel on the cable of power grid, is specifically used for acquiring three-phase current harmonic wave by the cable, and according to described three
One reverse current harmonic wave of phase current harmonic generation, feeds back to the compensating module.
3. system according to claim 2, which is characterized in that the filter module is using wavelet neural network denoising
The three-phase controllable current source of method.
4. according to the method described in claim 3, it is characterized in that, the APF and SVG uses shunt compensation mode, the benefit
It repays module and is connected to the filter module, specifically for being detected to harmonic signal, and according to the harmonic signal detected
Corresponding thermal compensation signal is generated, the compensating module includes Harmonic currents detection unit, hysteretic loop current control unit, by described
The parallel compensation unit of APF and SVG compositions.
5. system according to claim 4, which is characterized in that the input terminal of the transformation compensating unit is connected on power grid
It is connected to the cable of load, for the three-phase current of input to be converted to linear analog DC voltage, and in the simulation
When DC voltage is beyond allowing in variation range, voltage compensation is carried out；The thresholding discriminating unit, for the transformation will to be come from
The analog DC voltage of compensating unit flows through the upper limit gate circuit of the logic gates, lower limit gate circuit, obtains the three-phase
Maximum value in electric current and minimum value, and the maximum value is determined that door inputs in order to control, is determined as phase shortage by the minimum value
Door and unloaded gate input；Control output unit is made of flip and flop generator and SCR chopper, and the warning output uses
The sensitive relay of transistor controls.
6. according to claim 1-5 any one of them systems, which is characterized in that the thresholding discriminating unit is used by input electricity
The switching circuit of flow control.
7. system according to claim 6, which is characterized in that the mutual inductance device is specifically used for the electricity on the power grid
Signal carries out drop stream or decompression, to make the electric signal can be used for data processing；The A/D sampling units be specifically used for pair
The drop stream or the electric signal of decompression are sampled；The data processing unit is specifically used for referring to the electric signal after sampling
Mark calculates, so that whether the power transmission determined in the power grid breaks down；The communication unit is specifically used for index meter
Result after calculation feeds back to monitoring client.
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| CN201810288907.0A CN108429262A (en) | 2018-04-03 | 2018-04-03 | A kind of novel power quality protection system |
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| CN201810288907.0A CN108429262A (en) | 2018-04-03 | 2018-04-03 | A kind of novel power quality protection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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