CN205753433U - It is applied to the device administering three-phase imbalance of low-voltage distribution network - Google Patents
It is applied to the device administering three-phase imbalance of low-voltage distribution network Download PDFInfo
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- CN205753433U CN205753433U CN201620447102.2U CN201620447102U CN205753433U CN 205753433 U CN205753433 U CN 205753433U CN 201620447102 U CN201620447102 U CN 201620447102U CN 205753433 U CN205753433 U CN 205753433U
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- phase
- module
- master controller
- drive control
- dsp processing
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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
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
This utility model relates to a kind of device administering three-phase imbalance being applied to low-voltage distribution network, it is technically characterized by comprising the steps as follows: and includes three signals collecting and adjustment unit, three A/D converting units, three DSP processing modules, FPGA drive control module, three IGBT output modules, RISC master controller, human-computer interaction interface module and three distant interface modules, three signals collecting and adjustment unit connect respective DSP processing module by A/D converting unit respectively, and three DSP processing module output pwm control signals are also connected to FPGA drive control module；Three DSP processing modules are also connected with RISC master controller, and RISC master controller is also connected with FPGA drive control module.This utility model achieves the abatement functions of low-voltage distribution network three-phase imbalance, effectively improves distribution network electric energy quality, improves sale of electricity income, capacity utilization and the life-span of electric company, rural power grids distribution power factor etc..
Description
Technical field
This utility model belongs to low-voltage network technical field, a kind of is applied to controlling of low-voltage distribution network
The device of reason three-phase imbalance.
Background technology
In urban and rural residents of China and business low-voltage network, distribution transformer all uses three-phase transformer, three-phase
Load coexists with single-phase load.In recent years, along with the development of social and economic construction, three-phase imbalance, merit
Rate factor is low, the defective three aspect problems of quality of voltage highlight the most day by day, solves low-voltage network electric energy matter
Amount especially improvement three-phase imbalance is one of main task of Electric Power Network Planning and construction.
The current method administering rural power grids three-phase imbalance mainly have uniformly distributed, increase capacity of short circuit,
The methods such as inductance and capacitor combination adjustment, these administering method direct costs are the lowest, can obtain certain effect
Benefit, but, technique scheme is all to rely on single device to realize, by the factor such as technology, objectivity
Impact can not obtain good effect, substantial amounts of manpower also can be caused to waste, it is impossible to fundamentally solve
Certainly problem.
Summary of the invention
In place of the purpose of this utility model is to make up the deficiencies in the prior art, it is provided that a kind of reasonable in design,
Dependable performance and the with low cost device administering three-phase imbalance being applied to low-voltage distribution network.
This utility model solves it and technical problem is that and take techniques below scheme to realize:
A kind of device administering three-phase imbalance being applied to low-voltage distribution network, including three signals collecting and tune
Whole unit, three A/D converting units, three DSP processing modules, FPGA drive control module, three
IGBT output module, RISC master controller, human-computer interaction interface module and three distant interface modules, three letters
Number gather and adjustment unit synchronous acquisition electrical network three-phase electric energy parameter being adjusted, three signals collecting and
Adjustment unit connects respective DSP processing module by A/D converting unit respectively, and three DSP process mould
Block output pwm control signal is also connected to FPGA drive control module；Three DSP processing modules also with
RISC master controller is connected, RISC master controller interface module distant with human-computer interaction interface module and three phase
Connecting, RISC master controller is also connected with FPGA drive control module and controls FPGA and drives control mould
Block selects IGBT drive signal and drive IGBT unit.
Advantage of the present utility model and good effect be:
1, this utility model achieves the abatement functions of low-voltage distribution network three-phase imbalance, and can carry out idle
Compensate and stabilisation systems voltage, effectively improve distribution network electric energy quality, solve China's low-voltage network
The line loss that the factors such as the three characteristics of the middle term is load unbalanced, reactive power is bigger cause increases, the quality of power supply, peace
The problems such as full reliability reduction and controller switching equipment capacity utilization reduction, it is achieved that State Grid Corporation of China proposes
Building security is reliable, flexible operation, energy-conserving and environment-protective, the power distribution network requirement of economical and efficient.
2, this utility model can reduce low by improvement three-phase imbalance, reactive-load compensation, voltage pulsation improvement
It is press-fitted piezoelectric transformer and the line loss of distribution transmission, improves the sale of electricity income of electric company, improve distribution transformer
Exert oneself, capacity utilization and life-span, raising rural power grids distribution power factor.
3, this utility model holds improving the safe and reliable power supply capacity of low-voltage distribution network, the quality of power supply and controller switching equipment
Amount utilization rate, reduces distribution loss, and stabilisation systems voltage has precise effects, to meeting people's lives development
With economic growth need there is positive effect.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present utility model；
Fig. 2 is compensating three-phase unbalance theory diagram；
Fig. 3 is process step 1 theory diagram of compensating three-phase unbalance；
Fig. 4 is process step 2 theory diagram of compensating three-phase unbalance；
Fig. 5 a is the single-phase schematic diagram of reactive-load compensation；
Fig. 5 b is the one phase equivalent circuit figure of ideal situation；
Fig. 5 c is the one phase equivalent circuit figure of actual application；
Fig. 5 d is the phasor diagram that electric current is advanced；
Fig. 5 e is the phasor diagram after current hysteresis；
Fig. 6 is voltage support theory diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model embodiment is further described:
A kind of device administering three-phase imbalance being applied to low-voltage distribution network, as it is shown in figure 1, include three letters
Number gather and adjustment unit (A phase signals gather and adjustment unit, B phase signals gather and adjustment unit, C phase
Signals collecting and adjustment unit), three A/D converting units, three DSP processing module (A phase DSP process
Module, B phase DSP processing module and C phase DSP processing module), FPGA drive control module, three IGBT
Output module (A phase IGBT output module, B phase IGBT output module and C phase IGBT output module), RISC
Master controller, human-computer interaction interface module and three distant interface modules.Three signals collecting and adjustment unit synchronize
Gather the electrical energy parameter of electrical network A, B, C three-phase and be adjusted, then by entering after A/D converting unit
The DSP processing module of every phase, every phase DSP processing module according to data syn-chronization complete three-phase imbalance compensate,
Needed for reactive-load compensation, voltage support (voltage pulsation regulation) pwm control signal and be connected to FPGA drive control
Molding block；Three DSP processing modules are also connected with RISC master controller, RISC master controller and man-machine friendship
Mutual interface module is connected with three distant interface modules and realizes human-computer interaction function, three distant communication functions, RISC master
Controller is also connected with FPGA drive control module and according to the DSP operation data of every phase, automatically analyzes three
Plant the priority of compensation model, thus trigger FPGA drive control module and select IGBT drive signal and drive
IGBT unit, makes the quality of power supply of electrical network obtain optimized improvement.
Operation principle of the present utility model:
(1) compensating three-phase unbalance
This utility model operationally, can detect power network current by external impressed current transformer (CT) in real time,
Then the current information that CT collects is issued internal controller to process, after controller is analyzed,
Device it finds that the current imbalance state of system, calculates needed for three-phase current reaches poised state simultaneously
The current value of conversion, thus export corresponding pwm signal, drive rectification IGBT and inversion IGBT circuit,
The required output compensating electric current of the system that achieves, will out-of-balance current from little mutually defeated of network load electric current
Go out to the big phase of network load electric current, make each phase current of electrical network reach poised state, as shown in Figure 2.
As it is shown on figure 3, power network current occurs in that unbalanced state: A phase current is 15 amperes, B phase current
Be 10 amperes, C phase current be 5 amperes, poised state should be A, B, C three-phase and is 10 Ampere currents,
A phase current poised state to be reached then needs to reduce the electric current of 5 amperes, and B phase current is just 10 amperes of nothings
Needing to adjust, C phase current such as poised state to be reached then needs to increase the electric current of 5 amperes, complete through DSP operation
After one-tenth, controller will drive C phase IGBT action by IGBT drive circuit, by the exchange of C phase
Electric rectification is to be stored in the bus capacitor within device after unidirectional current；Then, controller will pass through IGBT
Drive circuit drives A phase IGBT action, by bus capacitor (public same group of A, B, the C within device
Bus capacitor) on unidirectional current carry out inversion, be then output in system A phase, such A, B, C three-phase
The all 10A of electric current, as shown in Figure 4.The unbalanced process of whole compensation it is to be understood that power network current from
System C phase flows into 5 amperes of this device, from the internal outflow of this device 5 amperes to system A phase, so that A,
It is 10 amperes that B, C three-phase current is all redistributed, and the three-phase total current of electrical network keeps constant.Its principle
It is exactly that the electric current that certain phase can additionally export is stored in device bus capacitor, then takes out from bus capacitor
Current compensation needs certain phase compensated.Certainly, this series of calculating and control action are all when the shortest
In complete, and, this device simply plays an effect again shunted in this course, only needs
The energy consuming very small part (such as fan running, controls the energy expenditure of device, the energy of switching device
Consume).Its action is instantaneous, and the virtual value of its transmitting-receiving electric current is balance within certain a period of time,
Therefore the result of its action can be interpreted as shunting action so that the virtual value of system three-phase current reaches one
Individual poised state.When system three-phase current all deviates equilibrium point, its compensation principle and two deviates equilibrium point
Situation be similar to.Its cardinal principle is still that and the electric current that certain phase can additionally export stores this device bus
In electric capacity, then take out, from bus capacitor, certain phase that current compensation needs to compensate.
(2) reactive-load compensation
No-power compensation function of the present utility model is exactly first power network current to be carried out rectification, by direct current time properly functioning
Electric energy is stored in the electric capacity of device, is equivalent to obtain the energy needed for compensating power from electrical network, so
By the break-make of electronic power switch, DC voltage is converted into the output electricity of AC and electrical network same frequency afterwards
Pressure, its core is just as a voltage source inverter, and what only the output of its AC connect is not passive load,
But electrical network.Therefore, when only considering first-harmonic, this device can equally be considered amplitude and phase place is the most controlled
The alternating-current voltage source with electrical network same frequency, it is connected on electrical network by AC inductance.Reactive-load compensation is single-phase former
As shown in Figure 5 a, its operation principle can illustrate reason figure with the equivalent circuit shown in Fig. 5 b.If line voltage and
This device output AC voltage uses phasor respectivelyWithRepresent, then connect the voltage on inductance XIt is
WithPhasor poor, and the electric current connecting inductance can be controlled by its voltage, and this electric current fills exactly
Put the electric current absorbed from electrical networkTherefore, this device AC output voltage is changedAmplitude and relative toPhase place, it is possible to change the voltage connected on inductance, thus control this device and absorb electric current from electrical network
Phase and amplitude, the most just controls character and the size of device absorbing reactive power.In figure 5b, electricity will be connected
Sense is considered as ideal inductance, does not accounts for its loss and loss of current transformer, therefore need not absorb from electrical network meritorious
Energy.In this case, only need to makeWithHomophase, only changesAmplitude size i.e. can control this
The electric current that device absorbs from electrical networkIt is advanced or delayed 90 °, and the size of this electric current can be controlled.Such as figure
Shown in 5b, work as U1During more than Us, electric current leading voltage 90 °, device absorbs the reactive power of capacitive；Work as U1Little
When Us, current lagging voltage 90 °, device absorbs the reactive power of perception.To consider in actual applications
To loss and the loss (such as tube voltage drop, line resistance etc.) of current transformer itself of connection inductance, and by total loss
Concentrate the resistance as connecting inductance to consider, then the actual equivalent circuit of this device is as shown in Figure 5 c, and its electric current surpasses
Before and the phasor diagram of delayed work as shown in Fig. 5 d and Fig. 5 e.In this case, current transformer voltageWith electric current
It is still difference 90 °, because current transformer is without meritorious energy.And line voltageWith electric currentDifference the most no longer
It is 90 °, but less than 90 ° δ angle, therefore electrical network provides the loss that active power is come in supplementary circuitry,
It is to say, from the point of view of relative to line voltage, electric currentIn have a certain amount of real component.This δ angle is namely
Current transformer voltageWith line voltagePhase contrast.Change this phase contrast, and changeAmplitude,
The electric current then producedPhase place and size change the most therewith, the reactive power that this device absorbs from electrical network is the most just
The most adjusted.
(3) voltage pulsation regulation
As shown in Figure 6, compensation point voltage is sampled by this utility model, and information of voltage is passed to inside
DSP, to judge whether compensation point voltage exceedes setting value, when voltage exceedes the pressure regulation upper limit (Umax),
Send pwm signal inside device and control the electric current of IGBT output and delayed 90 ° of electric network voltage phase, i.e.
Inductance current, reduces voltage；When voltage is less than pressure regulation lower limit (Umin), inside device, send PWM
Signal controls the electric current of IGBT output and advanced 90 ° of electric network voltage phase, capacity current, booster tension.
Finally make each phase voltage stable within normal range.
This utility model is through test, it can be seen that have a following functions feature:
(1) possessing three-phase imbalance and compensate function, tri-phase unbalance factor can be down to less than 3%；
(2) possessing no-power compensation function, power factor is up to 0.99 grade；
(3) possesses voltage support function；
(4) hold inductive load-1～1 compensation effect is adjustable.
It is emphasized that embodiment described in the utility model is illustrative rather than determinate,
Therefore this utility model includes the embodiment being not limited to described in detailed description of the invention, every by this area skill
Other embodiments that art personnel draw according to the technical solution of the utility model, also belong to this utility model
The scope of protection.
Claims (1)
1. the device administering three-phase imbalance being applied to low-voltage distribution network, it is characterised in that: include three
Signals collecting and adjustment unit, three A/D converting units, three DSP processing modules, FPGA drive control
Module, three IGBT output modules, RISC master controller, human-computer interaction interface module and three distant interface modules,
Three signals collecting and adjustment unit synchronous acquisition electrical network three-phase electric energy parameter are also adjusted, and three signals are adopted
Collection and adjustment unit connect respective DSP processing module, three DSP process by A/D converting unit respectively
Module output pwm control signal is also connected to FPGA drive control module；Three DSP processing modules also with RISC
Master controller is connected, and RISC master controller interface module distant with human-computer interaction interface module and three is connected,
RISC master controller is also connected with FPGA drive control module and controls FPGA drive control module and selects
IGBT drives signal and drives IGBT unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620447102.2U CN205753433U (en) | 2016-05-17 | 2016-05-17 | It is applied to the device administering three-phase imbalance of low-voltage distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620447102.2U CN205753433U (en) | 2016-05-17 | 2016-05-17 | It is applied to the device administering three-phase imbalance of low-voltage distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205753433U true CN205753433U (en) | 2016-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620447102.2U Expired - Fee Related CN205753433U (en) | 2016-05-17 | 2016-05-17 | It is applied to the device administering three-phase imbalance of low-voltage distribution network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205753433U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107248750A (en) * | 2017-06-12 | 2017-10-13 | 国家电网公司 | A kind of accumulation energy type power governor and distribution system for distribution system |
| CN111884238A (en) * | 2020-08-05 | 2020-11-03 | 西安西变组件有限公司 | Electric energy quality treatment device of low-voltage distribution network |
| CN112072936A (en) * | 2020-08-11 | 2020-12-11 | 深圳市汇川技术股份有限公司 | Rectification control method, system, equipment and computer readable storage medium |
-
2016
- 2016-05-17 CN CN201620447102.2U patent/CN205753433U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107248750A (en) * | 2017-06-12 | 2017-10-13 | 国家电网公司 | A kind of accumulation energy type power governor and distribution system for distribution system |
| CN111884238A (en) * | 2020-08-05 | 2020-11-03 | 西安西变组件有限公司 | Electric energy quality treatment device of low-voltage distribution network |
| CN112072936A (en) * | 2020-08-11 | 2020-12-11 | 深圳市汇川技术股份有限公司 | Rectification control method, system, equipment and computer readable storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161130 |