CN107895950A - A kind of mixing applied to low-voltage, high-current senses filtering system - Google Patents
A kind of mixing applied to low-voltage, high-current senses filtering system Download PDFInfo
- Publication number
- CN107895950A CN107895950A CN201711197922.6A CN201711197922A CN107895950A CN 107895950 A CN107895950 A CN 107895950A CN 201711197922 A CN201711197922 A CN 201711197922A CN 107895950 A CN107895950 A CN 107895950A
- Authority
- CN
- China
- Prior art keywords
- voltage
- current
- inverter
- load
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
-
- 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
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
A kind of mixing applied to low-voltage, high-current senses filtering system, including induction type rectifier transformer, active power filter system, the voltage measuring apparatus of outlet side, load-side current measuring device and commutation of load device, active power filter system includes voltage type active inverter, inverter o controller, DC capacitor and sensing filter circuit；The low pressure winding side joint commutation of load device of induction type rectifier transformer, middle pressure winding side joint voltage type active inverter and sensing filter circuit, high pressure winding side is connected with industrial power distribution network；The voltage measuring apparatus of control input outlet side of termination and the current measuring device of load-side of inverter o controller, and control output end is connected with voltage type active inverter.Using the system, the real-time tracking and dynamic filter to harmonic wave can be achieved, ensure that the grid side quality of power supply meets the requirement of national standard, while can effectively solve the harmonic problem that harmonic wave itself is brought to low-voltage, high-current system.
Description
Technical field
The present invention relates to a kind of mixing applied to low-voltage, high-current to sense filtering system, and art is mainly electricity
Force system and the harmonic wave control and reactive power compensation of industrial distribution system.
Background technology
Due to power electronic devices unintentional nonlinearity characteristic, its when power system and industrial distribution system are applied,
Inevitably cause the power quality problems such as harmonic pollution is serious, power factor is low, voltage flicker and imbalance.At present,
Improving the method for the quality of power supply includes passive filtering, active power filtering, mixing active power filtering and sensing filtering.
Passive filtering is because apparatus structure is fairly simple, design is easier with manufacture, and initial investment cost is relatively low,
Power system in industrial distribution system with being widely used.However, passive filter is merely able to suppress specific subharmonic,
When electric power networks structure or load change, the change of resonant frequency can be caused, now passive filter suppresses harmonic wave
Ability can reduce, it could even be possible to producing resonance, influence electric power system stability.
Active power filtering can be solved fundamentally with mixing Active Power Filter Technology by way of real-Time Compensation harmonic current
State the problem of passive filtering is present, but existing wholly-controled device capacity is less than normal and limits both filtering the problem of selling at exorbitant prices
The popularization and application of technology.
Either passive filtering or active power filtering, it is mainly used to solve harmonic wave and the idle harmful effect to power network, but
For the electricity system itself being connected with power network, harmonic wave and reactive component can free flow, cannot get any suppression.
Sensing filtering solves this problem from root, and it can improve the electromagnetic environment of main equipment in electric power system, reduces master and sets
Standby added losses, noise and vibration, and increase the stability of a system and operational efficiency.But it, can not as passive filtering
Solve the problems, such as when system harmonicses change time-harmonic wave inhibition be deteriorated.
The content of the invention
The technical problem to be solved by the invention is to provide a kind of mixing sensing filtering system applied to low-voltage, high-current
System.Using the system, the real-time tracking and dynamic filter to harmonic wave can be achieved in low-voltage, high-current system, ensure grid side electricity
Energy quality meets the requirement of national standard, while can effectively solve the harmonic problem that harmonic wave itself is brought to low-voltage, high-current system.
The technical solution adopted for the present invention to solve the technical problems is：A kind of mixing applied to low-voltage, high-current senses
Filtering system, including the voltage measuring apparatus of induction type rectifier transformer, active power filter system, outlet side, load
The current measuring device and commutation of load device of side, the active power filter system include voltage type active inverter, inverter
O controller, DC capacitor and sensing filter circuit；The low pressure winding side joint commutation of load of the induction type rectifier transformer
Device, middle pressure winding side joint voltage type active inverter and sensing filter circuit, high pressure winding side is connected with industrial power distribution network；Institute
The current measurement of voltage measuring apparatus and load-side that the control input for stating inverter o controller terminates an outlet side fills
Put, and control output end is connected with voltage type active inverter.
Further, the voltage measuring apparatus of the primary side is voltage sensor.
Further, the current measuring device of the load-side is current sensor.
The beneficial effects of the invention are as follows：
（1）The impedance value of rectifier transformer is adjusted using rectifier dynamic, the impedance of the rectifier transformer medium voltage side can be caused
Zero is issued in specific subfrequency, so as to realize that dynamic filters out the purpose of harmonic wave；
（2）The filtering method is only related to rectifier transformer filtered side, the influence without considering system impedance, also will not be to being
The normal operation of system produces interference；
（3）The fast-changing compensation electric current of frequency can be produced using inverter, when frequency occurs for nonlinear load side or grid side
During rate rapid fluctuations, compensation electric current can be quickly compensated the harmonic wave of assigned frequency, so as to ensure to principal character harmonic wave
The rejection of electric current；
（4）With two-way harmonic shielding function, the filter branch of described inverter and sensing filter circuit composition can be inhaled simultaneously
Receive the harmonic current from nonlinear load side and from IGCT controlled reactor side so that harmonic current is shielded from close
At harmonic source, so, the circulation path of harmonic current is shortened so that the rectifier transformer first side winding and grid side
Harmonic current content very little, in good sine；
（5）It can realize that the dynamic nearby of reactive power compensates so that as caused by nonlinear load close to nonlinear load side
Reactive component will not crosstalk to the first winding side of the rectifier transformer and grid side, even if ripple occurs for nonlinear load
Dynamic, the power factor of the rectifier transformer first winding side and grid side maintains desired value all the time（More than 0.95）；
（6）Due to harmonic wave and it is idle suppressed and compensated nearby close to nonlinear load side, this not only lowers described
Added losses, temperature rise, the noise and vibration of rectifier transformer, and realize the high power of whole industrial rectifier power system because
Number and high-efficiency stable operation.
Brief description of the drawings
Fig. 1 is the structured flowchart of the embodiment of the present invention；
Fig. 2 is the synthesis equivalent model of the induction type rectifier transformer of embodiment illustrated in fig. 1；
Fig. 3 is the detailed equivalent model of the induction type rectifier transformer of embodiment illustrated in fig. 2；
Fig. 4 is the control flow chart of the present invention；
In Fig. 1：1- industrial power distribution networks, the voltage measuring apparatus of outlet side of 2-, 3- induction type rectifier transformers, 4- load-sides
Current measuring device, 5- commutation of load devices, 6- DC loads, 7- active power filter systems, 8- inverter o controllers,
9- DC capacitors, 10- voltage type active inverters, 11- sensing filter circuits.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Reference picture 1, the present embodiment include induction type rectifier transformer 3, active power filter system 7, outlet sides
The current measuring device 4 and commutation of load device 5 of voltage measuring apparatus 2, load-side, the active power filter system 7 include electricity
Die mould active inverter 10, inverter o controller 8, DC capacitor 9 and sensing filter circuit 11；The induction type rectification becomes
The low pressure winding side joint commutation of load device 5 of depressor 3, middle pressure winding side joint voltage type active inverter 10 and sensing filter circuit
11, high pressure winding side is connected with industrial power distribution network 1；The control input termination of the inverter o controller 8 once exports
The voltage measuring apparatus 2 of side and the current measuring device 4 of load-side, and control output end is connected with voltage type active inverter 10
Connect.
In the present embodiment, the voltage measuring apparatus 2 of the primary side is voltage sensor.
In the present embodiment, the current measuring device 4 of the load-side is current sensor.
In the present embodiment, the voltage type active inverter 10 can use diversified forms, including single level, three level or
More level etc..
The low pressure winding side external load rectifier 5 of induction type rectifier transformer 3 described in the present embodiment, the side winding use
The delta connection mode of cophase counter parallel connection, to meet the low-voltage, high-current power demands of industrial DC load 6；Middle pressure winding is adopted
With delta connection mode, and external active power filter system 7；High pressure winding uses star-connection mode, and and work
The equivalent AC power of industry power distribution network 1 is connected；The voltage measuring apparatus 2 that active power filter system 7 passes through primary side（Voltage
Sensor）With the current measuring device 4 of load-side（Current sensor）Collection voltages current signal, pass through inverter output control
Device 8 sends control signal driving voltage type active inverter 10 and worked, and generates the voltage specified.DC capacitor 9 as direct current and
The energy storage device of conversion is exchanged, on the one hand the harmonic electric energy of each phase can be stored, on the other hand can also be provided
Steady dc voltage is as inverter.The voltage that voltage type active inverter 10 exports is changed by sensing filter circuit 11
Induction type rectifier transformer 3 is sent into electric current, so as to realize the dynamic compensation to each phase harmonic current.
The synthesis equivalent model of induction type rectifier transformer is as shown in Fig. 2 its detailed model is as shown in Figure 3.According to transformation
Device is theoretical, can be included in the voltage equation such as formula (1) of transformer fundamental wave harmonic.
(1)
Z in equation (1)h21And Zh23It can be obtained by short-circuit test, Z2hCalculation formula be
(2)
Formula (3) is can obtain according to transformer magnetic balance.
(3)
According to kirchhoffs law, electric current such as formula (4), formula (5) institute of transformer primary side and secondary side can obtain
Show.
(4)
(5)
From formula (4), ideally, whenZ 3hWithZ FhWhen meeting following condition, the harmonic current of net side is zero.
(6)
With reference to inductive filter model, the electromagnetic balance equation of perceptual filter rectification transformer is can obtain by formula 5 and 6
(7)
It can be seen that the magnetic potential of this time-harmonic wave has reached balance in the secondary and filter branch of transformer, therefore will not be again to original
Side, i.e. industrial power distribution network have an impact, that is, prevent pollution of the harmonic current to net side.
In order to realize dynamic sensing filtering, active power filter system needs the change of real-time tracking load-side harmonic current
To change, prediction should flow into the harmonic content of filter branch, and then dynamic changes output current, so as to change the impedance of filter branch,
Harmonic current is sucked into filter branch, so as to reach the purpose that dynamic filters out harmonic wave.The program flow diagram of active power filtering controller
As shown in figure 4, control process needs to undergo following components：
1) three-phase voltage of industrial power distribution net side and the three-phase current of load-side are detected, is calculated using instantaneous reactive power theory
Go out instantaneous active-power P and reactive power Q.
2) direct current and low frequency component in P and Q are filtered off using high-pass filter, reserved high-frequency is harmonic components.Cutoff frequency
Rate is set to 100Hz.
3) size of the harmonic wave of filter branch is flowed into using P-Q transformation calculations, while direct current is superimposed in instruction current
Controlled quentity controlled variable.
4) Proportional coefficient K is adjusted, matches output valve and carrier waveform.
5) generation pwm signal is exported to inverter, inverter output compensation electric current.
Claims (3)
1. a kind of mixing applied to low-voltage, high-current senses filtering system, it is characterised in that：Including induction type rectifier transformer,
Voltage measuring apparatus, the current measuring device and commutation of load device of load-side of active power filter system, outlet side, institute
Stating active power filter system includes voltage type active inverter, inverter o controller, DC capacitor and sensing filtered electrical
Road；The low pressure winding side joint commutation of load device of the induction type rectifier transformer, middle pressure winding side joint voltage type active inverter
With sensing filter circuit, high pressure winding side is connected with industrial power distribution network；The control signal of the inverter o controller
Connect the voltage measuring apparatus of outlet side and the current measuring device of load-side, and control output end and voltage type active inversion
Device is connected.
2. the mixing according to claim 1 applied to low-voltage, high-current senses filtering system, it is characterised in that：Described one
The voltage measuring apparatus of secondary side is voltage sensor.
3. the mixing according to claim 1 or 2 applied to low-voltage, high-current senses filtering system, it is characterised in that：Institute
The current measuring device for stating load-side is current sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711197922.6A CN107895950A (en) | 2017-11-25 | 2017-11-25 | A kind of mixing applied to low-voltage, high-current senses filtering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711197922.6A CN107895950A (en) | 2017-11-25 | 2017-11-25 | A kind of mixing applied to low-voltage, high-current senses filtering system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107895950A true CN107895950A (en) | 2018-04-10 |
Family
ID=61806057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711197922.6A Withdrawn CN107895950A (en) | 2017-11-25 | 2017-11-25 | A kind of mixing applied to low-voltage, high-current senses filtering system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107895950A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110224413A (en) * | 2019-06-11 | 2019-09-10 | 广东华控电气节能科技有限公司 | A kind of power transmission and distribution regulating device and its metering method, control method |
-
2017
- 2017-11-25 CN CN201711197922.6A patent/CN107895950A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110224413A (en) * | 2019-06-11 | 2019-09-10 | 广东华控电气节能科技有限公司 | A kind of power transmission and distribution regulating device and its metering method, control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106451466B (en) | Grid power quality control system and method based on Research on Unified Power Quality Conditioner | |
| Singh et al. | A review of active filters for power quality improvement | |
| CN103227581B (en) | Inverter parallel harmonic wave ring current restraining method for controlling harmonic wave droop | |
| Rastogi et al. | Hybrid-active filtering of harmonic currents in power systems | |
| CN103078480B (en) | Circulation control method of modular multilevel converter | |
| Luo et al. | A novel three-phase hybrid active power filter with a series resonance circuit tuned at the fundamental frequency | |
| CN206272496U (en) | A kind of energy feedback type power network analog power | |
| CN106329979B (en) | A kind of MMC double loop suppressing method for high-speed permanent magnet motor system | |
| CN103595048A (en) | Mixed induction type active electric power filter system | |
| CN110350792A (en) | A kind of power master-slave control method of DC transformer | |
| CN103904909A (en) | Double-PWM frequency converter integrated coordinated control system based on fractional order control | |
| CN107733245A (en) | A kind of efficiently amplitude modulation perseverance high-frequency electric dust removal power circuit | |
| CN107134798A (en) | PCC Voltage unbalances and harmonic suppressing method based on parallel virtual impedance | |
| CN104466963A (en) | Power induction and regulation filtering device and control method thereof | |
| CN210839320U (en) | LCLC type passive damping circuit, single-phase and three-phase grid-connected inverter system | |
| CN105978018B (en) | A kind of LC types control method of grid-connected inverter | |
| CN107895950A (en) | A kind of mixing applied to low-voltage, high-current senses filtering system | |
| CN104578833B (en) | High quality Active Front End current transformer implementation method based on thyristor | |
| CN104104254A (en) | Photovoltaic inverter inductance compensation control method based on space vector pulse width modulation (SVPWM) | |
| Martin-Arnedo et al. | Development and testing of a distribution electronic power transformer model | |
| Bezzub et al. | Unified Power Quality Conditioner Electrical Complex for Compensation Influence of Sharply Variable Loading | |
| CN107134934A (en) | A kind of Passively compensated low harmony wave 12 pulsating wave self coupling transformer rectifier circuit | |
| CN107394783A (en) | The active tuning type compound filter of transformer coupled and separated exciting and control method | |
| El-Rahman et al. | PERFORMANCE ANALYSIS OF ACTIVE POWER FILTER CONTROLLERS FOR HARMONICS MITIGATION IN POWER SYSTEMS | |
| CN209105050U (en) | A kind of 24 pulse wave converter topologies of cascade |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180410 |