CN201639297U - Control device for active power filter of distribution network - Google Patents
Control device for active power filter of distribution network Download PDFInfo
- Publication number
- CN201639297U CN201639297U CN2009202357573U CN200920235757U CN201639297U CN 201639297 U CN201639297 U CN 201639297U CN 2009202357573 U CN2009202357573 U CN 2009202357573U CN 200920235757 U CN200920235757 U CN 200920235757U CN 201639297 U CN201639297 U CN 201639297U
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- digital conversion
- control device
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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]
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Abstract
The utility model discloses a control device for active power filter of a distribution network, which consists of a drive circuit (3), a relay protective circuit (4), a human-machine interactive circuit (5), an analog-digital conversion circuit (6) and a controlling and operating circuit (7), wherein the input end of the analog-digital conversion circuit (6) is connected with the output end of an external data acquisition circuit (1); the output end of the analog-digital conversion circuit (6) is sequentially connected in series with the controlling and operating circuit (7) and the drive circuit (3) and then connected with the control end of an external bridge type converter (2); and the controlling and operating circuit (7) is respectively and bidirectinally connected with the relay protective circuit (4) and the human-machine interactive circuit (5). The utility model can be used for detecting harmonic wave and passive current and sending compensation current, thereby improving the quality of electric energy.
Description
Technical field
The utility model relates to a kind of control device that has the active power filtering of no-power compensation function, belongs to the technical field of the control device that improves the quality of power supply.
Background technology
Along with the extensive use and the development of power electronic technology, the nonlinear load in the electric power system is increasing, as rectifier, frequency converter, UPS, household electrical appliance and computer etc.These nonlinear loads can produce harmonic current and be injected in the electrical network, make the voltage waveform in the electrical network produce distortion, thereby cause the harmonic pollution of electrical network.In addition, impact, fluctuating load, being in operation as arc furnace, welding equipment etc. not only can produce a large amount of high order harmonic components, and makes voltage fluctuation, flickering, three-phase imbalance serious day by day, the safe operation of harm electrical network.
Not only great majority loads is wanted consume reactive power in power system network, and networking components such as most of stage transformers, line reactance are also wanted consume reactive power.The reactive power that networking component and load need in the electric power system must obtain from network somewhere.If these needed reactive powers are provided by generator and carry through long distance, obviously be irrational, also be impossible usually; If these needed reactive powers can not in time be compensated, the safe operation of electric power system and the safety of power consumption equipment will be affected.Therefore, reactive power compensation has significance to electric power system.
At the harmonic pollution conventional method is to adopt the LC filter.Influenced by electric network impedance and running status but the major defect of this method is a compensation characteristic, easily and system's generation resonance, cause harmonic wave to amplify, the LC filter is transshipped even burn.In addition, it can only compensate fixedly subharmonic, and compensation effect is undesirable.
General reactive power compensator is a shunt capacitor at present.But Shunt Capacitor Unit is a discrete magnitude, can't do the Continuous Compensation of reactive power, and when having harmonic wave in system, also parallel resonance might take place, and harmonic wave is amplified, and the accident that therefore capacitor burns also happens occasionally.
And active filter both can dynamically suppress harmonic wave, can realize dynamic passive compensation again, can also suppress voltage fluctuation, voltage flicker and three-phase imbalance, and inhibition electrical network each harmonic electric current that can efficient real time, be not subjected to the influence of system operation mode and harmonic wave electrorheologicalization, not can with electrical network generation series parallel resonance, therefore become the new direction of quality of power supply development.Yet the prior art of active filter is not very ripe, especially is embodied in control section.The quality of control section directly influences filter effect and compensation effect, and present domestic all big enterprises all are in the stage of feeling one's way into.
The utility model content
The purpose of this utility model is for overcoming the deficiencies in the prior art, designed a kind of control device of power distribution network active power filtering, can detect harmonic wave and reactive current, and sends offset current, thereby improves the quality of power supply.The utility model adopts following technical scheme for achieving the above object:
The control device of a kind of power distribution network active power filtering of the utility model; it is characterized in that: form by drive circuit, relay protection circuit, man-machine interaction circuit, analog to digital conversion circuit and control and computing circuit; the output of the input termination external data Acquisition Circuit of analog to digital conversion circuit wherein; the output of analog to digital conversion circuit is connected in series the control end that connects outside bridge-type current transformer behind control and computing circuit, the drive circuit successively, and control is connected with the man-machine interaction circuit is two-way with relay protection circuit respectively with computing circuit.
The beneficial effects of the utility model are:
But 1 detection system electric current is isolated its first-harmonic and idle composition, and output and system harmonics and the anti-phase current signal of idle composition drive main power circuit and send offset current, thereby reaches the idle purpose of filtering harmonic compensation.
2, the THD (current harmonics resultant distortion rate) of active filter compensation back system power is less than 5%, compensation back system power factor is greater than 0.99, show the dynamic process that the three phase network electric current changed when this device dropped into electrical network, its response time is less than 125us, and transient process is steadily reliable, is better than traditional control method.
3,2 to 60 subharmonic in can the filtering power distribution network of dynamic real-time, the system's reactive power of can instantaneously handling up continuously improves the quality of power supply, guarantees the power consumer Electrical Safety, and energy savings is brought direct economic and social benefits.
Description of drawings
Fig. 1 is the structural representation of active filter control circuit.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to utility model:
The utility model such as Fig. 1: control circuit is by data acquisition circuit 1, and analog to digital conversion circuit 6 is controlled and computing circuit 7, drive circuit 3, and relay protection circuit 4 and man-machine interaction circuit 5 are formed.Data acquisition circuit 1 is gathered three groups of signals: system power, system voltage and device output current.After being translated into digital signal, send into computing and control circuit 7 that two DSP (digital signal processor) constitute.Computing will be imported data based instantaneous reactive theory with control circuit 7 current harmonics will be come with the idle component place of separation, arrive drive circuit 3 according to dead beat (Deadbeat) control strategy output PWM ripple (pulse-width modulation) again.Drive circuit 3 is connected on the gate pole of IGBT 2, drives the break-make of IGBT.Turning on and off of relay protection circuit 4 control external switches is by computing and control circuit 7 controls.Man-machine interaction circuit 5 is operation interfaces of device, and parameter can be set, and control device starts.
All can make comparisons output current signal and instruction signal at each switch periods control circuit, the margin of error is added in the instruction current of next switch periods, guarantee compensation precision.
The PWM control strategy of this device adopts Deadbeat (dead beat) control algolithm, and this method amount of calculation is bigger, but the characteristics that its switching frequency is fixed, dynamic response is fast are very suitable for the digital control of combining inverter. Its hardware foundation is high performance couple of DSP (digital signal processor). Compare with simulation control, Digital Control have control flexibly, the advantage such as malleable control algolithm and hardware debug be convenient. The principle of this method is the zero hour in each switch periods, the current i that sampling grid-connected inverters side produces, and dope the current reference value j of next of grid-connected inverters side the zero hour in cycle, calculated the switch time of switching device by difference j-i, make i equal j in next zero hour in cycle, be worth the dutycycle of needs according to this, and then calculate pulse width.
Claims (2)
1. the control device of a power distribution network active power filtering; it is characterized in that: by drive circuit (3); relay protection circuit (4); man-machine interaction circuit (5); analog to digital conversion circuit (6) and control and computing circuit (7) are formed; the output of the input termination external data Acquisition Circuit (1) of analog to digital conversion circuit (6) wherein; the output of analog to digital conversion circuit (6) is connected in series control and computing circuit (7) successively; connect the control end of outside bridge-type current transformer (2) behind the drive circuit (3), control with computing circuit (7) respectively with relay protection circuit (4) and two-way connection of man-machine interaction circuit (5).
2. the control device of power distribution network active power filtering according to claim 1 is characterized in that: described control and computing circuit (7) are made of two dsp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202357573U CN201639297U (en) | 2009-09-23 | 2009-09-23 | Control device for active power filter of distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202357573U CN201639297U (en) | 2009-09-23 | 2009-09-23 | Control device for active power filter of distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201639297U true CN201639297U (en) | 2010-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202357573U Expired - Fee Related CN201639297U (en) | 2009-09-23 | 2009-09-23 | Control device for active power filter of distribution network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201639297U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175907A (en) * | 2011-03-10 | 2011-09-07 | 华北电力大学（保定） | Flexible wide area power grid phase measurement system |
| CN110098614A (en) * | 2018-01-29 | 2019-08-06 | 东方博沃（北京）科技有限公司 | The controller and its operating method of active filter |
-
2009
- 2009-09-23 CN CN2009202357573U patent/CN201639297U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175907A (en) * | 2011-03-10 | 2011-09-07 | 华北电力大学（保定） | Flexible wide area power grid phase measurement system |
| CN110098614A (en) * | 2018-01-29 | 2019-08-06 | 东方博沃（北京）科技有限公司 | The controller and its operating method of active filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101117 Termination date: 20130923 |