CN2645316Y - Digital active electric power filter - Google Patents
Digital active electric power filter Download PDFInfo
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- CN2645316Y CN2645316Y CN 03250303 CN03250303U CN2645316Y CN 2645316 Y CN2645316 Y CN 2645316Y CN 03250303 CN03250303 CN 03250303 CN 03250303 U CN03250303 U CN 03250303U CN 2645316 Y CN2645316 Y CN 2645316Y
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- current
- filter
- inverter bridge
- apf
- active power
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Abstract
A novel digital active electric power filter is characterized in that the filter comprises a detect unit (1), a control unit (2), a convertor (3), a power accumulating unit (4), and a filter circuit (5), wherein the detect unit (1) detects the three phase current output of the voltage on the load end, the current signal and the convertor (3) and transmits the detect signal into the control unit (2) to calculate and analyze, corresponding pulse is exported to drive the high-power switch S<1>-S<6>of an inverter bridge in the convertor (3) to operate to produce the current of the same size and opposite direction with the harmonic current in the load current, the high-order current component caused by the high-power switch S<1>-S<6> high frequency switch of the inverter bridge in the convertor (3) is filtered by the filter circuit (5), and the power accumulating unit (4) provides energy for the inverter bridge of the convertor (3) and is charged by an ant parallel diode D <1>-D<6> of every high-power switch S<1>-S<6> in the inverter bridge.
Description
One, technical field
The utility model relates to a kind of novel digital Active Power Filter-APF, belongs to electric and electronic technical field.
Two, background technology
Along with the development of technology, various complexity, the accurate user to quality of power supply sensitivity constantly increase on the one hand; On the other hand, the use of the equipment of generation electric harmonic such as frequency converter, industrial power or the like is increasingly extensive, makes that the harm of electric harmonic is more and more outstanding, sharp-pointed.All there are corresponding standard and rules that harmonic wave is limited now both at home and abroad, mainly adopt quiet, dynamic Passively compensated filters such as synchronous compensator, connection in series-parallel capacitor, LCR branch road in parallel, saturable reactor for harmonic wave control and reactive power compensation at present.Synchronous compensator can only be used for reactive power compensation, and its reaction speed is slow, and mains by harmonics can obviously increase its loss.Passively compensated filter then has following deficiency: its filtering compensation characteristic depends on electrical network and load parameter, and these parameters are often to change; The drift of LCR parameter can cause the change of filtering characteristic; Series parallel resonance between electrical network and filter may take place, and causes harmonic wave to amplify; Have negative voltage and adjust effect.Its application has suitable limitation.Therefore, the Active Power Filter-APF development of being born at the end of the seventies in last century is rapid, and along with the progress of computer technology and power electronic technology constantly moves towards perfect.
Active Power Filter-APF is a kind of multifunctional electric power device that is used for dynamically suppressing harmonic wave and dynamic compensation reactive power, on the principle based on advanced person's instantaneous reactive power theory, filter detects the size of load current in real time, subtract each other with it after calculating corresponding first-harmonic value, draw the harmonic current and the reactive current that need compensation, high-power electronic switch on the control inverter bridge makes it to export required offset current, reaches the effect that suppresses harmonic wave and compensating reactive power.As Gao Yukui " electric drive " 1999,29 (1) 51-53, the research of Active Power Filter-APF; Wang Lei " the 14 national power technology annual meeting " 2001, P.312-314,311, based on the control of the three-phase four-wire active power filter of DSP; Wang Xiaofeng " single-chip microcomputer and embedded system are used " 2002 (1) 69-72, the application of TMS320F2XX in Active Power Filter-APF etc. all has report.
Though existing at present DSP or the single-chip computer control system of adopting, detect in real time, the tracking load current changes, automatically produce the bibliographical information of the digitlization Active Power Filter-APF of corresponding compensation electric current, but looking into new mechanism through authority confirms, this project adopts DSP and single-chip microcomputer at the same time, make it to organically combine the two system control cpus of formation, the variation that improves Active Power Filter-APF real-time tracking ability and high frequency filter parameter and load counts innovation to some extent on these 2 of the offset current reference values in real time, makes the technical performance of this novel digital Active Power Filter-APF reach international most advanced level.
Three, summary of the invention
The purpose of this utility model is a kind of novel digital Active Power Filter-APF that proposes at the deficiencies in the prior art.This device adopts DSP and single-chip microcomputer simultaneously, make it to organically combine the two system control cpus of formation, improved Active Power Filter-APF real-time tracking ability, and the variation of high frequency filter parameter and load counted the offset current reference value in real time, make that the input current of electrical network is a sinusoidal waveform, and reach the harmonic component in the compensating load electric current and the purpose of reactive power.
The purpose of this utility model is realized by following technical measures:
The novel digital Active Power Filter-APF is by being made up of detecting unit, control unit, current transformer, energy-storage units and filter circuit.Detecting unit detects the three-phase output current of voltage, current signal and the current transformer of load end, and detection signal is sent into control unit carry out analytical calculation, exports the high-power switch tube S of inverter bridge in the corresponding pulsed drive current transformer
1～S
6Work, with produce with load current in the electric current of harmonic current opposite sign but equal magnitude, thereby reach the harmonic component in the compensating load electric current and the purpose of reactive power, realize that the input current of electrical network is a sinusoidal waveform.The filter circuit filtering is owing to the high-power switch tube S of inverter bridge in the current transformer
1～S
6The caused high order current component of HF switch.Energy needed when energy-storage units provides the inverter bridge in the current transformer to work, and by each high-power switch tube S in the inverter bridge
1～S
6Inverse parallel diode D
1～D
6Charge.
Detecting unit is made up of voltage sensor and current sensor.
Control unit is made up of digital signal processor DSP, single-chip microcomputer and isolation drive.
Filter circuit is by inductance L
1～L
3, capacitor C
1～C
6And resistance R
1～R
3Form.
The utlity model has following advantage:
1, the real-time tracking ability is strong, and harmonic current and reactive power compensation are effective.
Voltage: THD
u≤ 5.0%;
Electric current: THD before the compensation
i＜50% o'clock, compensation back THD
l≤ 5.0%;
THD before the compensation
i, can compensate more than 90% of resultant distortion rate at 〉=50% o'clock.
2, power factor height: cos 〉=0.98.
3, overload capacity: do not have the overload problem, when harmonic wave in the system is big, still can work on.
4, adaptive capacity: when system impedance and frequency generation fluctuation, can not influence compensation effect.
5, damping action: can not produce resonance or harmonic wave and amplify, and externally circuit oscillation has damping action.
Four, description of drawings
Fig. 1 is the structured flowchart of novel digital Active Power Filter-APF.
Fig. 2 is the circuit theory diagrams of novel digital Active Power Filter-APF.
1 detecting unit, 2 control units, 3 current transformers, 4 energy-storage units, 5 filter circuits, 6 digital signal processor DSPs, 7 single-chip microcomputers, 8 isolation drive.
Five, embodiment
Below by embodiment the utility model is specifically described; be necessary to be pointed out that at this following examples only are used for the utility model is further specified; can not be interpreted as the restriction to the utility model protection range, the person skilled in the art in this field can make some nonessential improvement and adjustment according to above-mentioned content of the present utility model.
Embodiment
The novel digital Active Power Filter-APF is shown in Fig. 1～2, and it is made up of detecting unit 1, control unit 2, current transformer 3, energy-storage units 4 and filter circuit 5.Detecting unit 1 is made up of voltage sensor and current sensor.Control unit 2 is made up of digital signal processor (DSP) 6, single-chip microcomputer 7 and isolation drive 8.Current transformer 3 is by high-power electronic switch S
1～S
6And inverse parallel diode D
1～D
6Form.Filter circuit 5 is by inductance L
1～L
3, capacitor C
1～C
6And resistance R
1～R
3Form.Energy-storage units is by capacitor C
7～C
8Form.The above-mentioned circuit connecting mode of respectively organizing electronic component is as follows: the three-phase output current of the voltage of 1 pair of load end of detecting unit, current signal and current transformer 3 detects, and detection signal is sent into control unit 2.Single-chip microcomputer 7 in the control unit 2 is sent detection signal into digital signal processor DSP 6 and is carried out analytical calculation, and result of calculation is exported to isolation drive 8.The high-power switch tube S of inverter bridge in the corresponding pulsed drive current transformer 3 of isolation drive 8 outputs
1～S
6Work, with produce with load current in the electric current of harmonic current opposite sign but equal magnitude, thereby reach the harmonic component in the compensating load electric current and the purpose of reactive power, realize that the input current of electrical network is a sinusoidal waveform.Filter circuit 5 filterings are owing to the high-power switch tube S of inverter bridge in the current transformer 3
1～S
6The caused high order current component of HF switch.Energy needed when energy-storage units 4 provides the inverter bridge in the current transformer 3 to work, and by each high-power switch tube S in the inverter bridge
1～S
6Inverse parallel diode D
1～D
6Charge.
Claims (4)
1, novel digital Active Power Filter-APF, it is characterized in that this filter is made up of detecting unit (1), control unit (2), current transformer (3), energy-storage units (4) and filter circuit (5), detecting unit (1) detects the three-phase output current of voltage, current signal and the current transformer (3) of load end, and detection signal is sent into control unit (2) carry out analytical calculation, export the high-power switch tube S of inverter bridge in the corresponding pulsed drive current transformer (3)
1～S
6Work is with the electric current of the harmonic current opposite sign but equal magnitude in generation and the load current, simultaneously by the high-power switch tube S of filter circuit (5) filtering owing to inverter bridge in the current transformer (3)
1～S
6The caused high order current component of HF switch; Energy needed when energy-storage units (4) provides the inverter bridge in the current transformer (3) to work, and by each high-power switch tube S in the inverter bridge
1～S
6Inverse parallel diode D
1～D
6Charge.
2,, it is characterized in that detecting unit (1) is made up of voltage sensor and current sensor according to the described novel digital Active Power Filter-APF of claim 1.
3,, it is characterized in that control unit (2) is made up of digital signal processor DSP (6), single-chip microcomputer (7), isolation drive (8) according to the described novel digital Active Power Filter-APF of claim 1.
4,, it is characterized in that filter circuit (5) is by inductance L according to the described novel digital Active Power Filter-APF of claim 1
1～L
3, capacitor C
1～C
6And resistance R
1～R
3Form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03250303 CN2645316Y (en) | 2003-09-12 | 2003-09-12 | Digital active electric power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03250303 CN2645316Y (en) | 2003-09-12 | 2003-09-12 | Digital active electric power filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2645316Y true CN2645316Y (en) | 2004-09-29 |
Family
ID=34293877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03250303 Expired - Fee Related CN2645316Y (en) | 2003-09-12 | 2003-09-12 | Digital active electric power filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2645316Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100525028C (en) * | 2004-04-01 | 2009-08-05 | 盈正豫顺电子股份有限公司 | Electric converter of hybrid electric filter |
| CN102025145A (en) * | 2010-11-27 | 2011-04-20 | 南京航空航天大学 | Bidirectional chopper-based direct current active power filter and control method thereof |
| CN101719672B (en) * | 2009-12-09 | 2012-02-29 | 中国石油大学(北京) | Active power filter and energy reforming control method thereof |
| CN102403957A (en) * | 2011-11-08 | 2012-04-04 | 厦门大学 | Harmonic-free frequency conversion speed adjusting device |
| CN105762799A (en) * | 2014-12-17 | 2016-07-13 | 利思电气（上海）有限公司 | Embedded type active inversion unit |
| CN106712020A (en) * | 2016-12-29 | 2017-05-24 | 江苏越达电力设备有限公司 | Modular design-based active filter device |
| CN106786651A (en) * | 2016-12-29 | 2017-05-31 | 江苏越达电力设备有限公司 | A kind of tuning reactive-load compensation and filter based on intelligent control method |
| CN113328639A (en) * | 2021-07-09 | 2021-08-31 | 四川大学 | High-power electrolytic hydrogen production rectification power supply and control method |
-
2003
- 2003-09-12 CN CN 03250303 patent/CN2645316Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100525028C (en) * | 2004-04-01 | 2009-08-05 | 盈正豫顺电子股份有限公司 | Electric converter of hybrid electric filter |
| CN101719672B (en) * | 2009-12-09 | 2012-02-29 | 中国石油大学(北京) | Active power filter and energy reforming control method thereof |
| CN102025145A (en) * | 2010-11-27 | 2011-04-20 | 南京航空航天大学 | Bidirectional chopper-based direct current active power filter and control method thereof |
| CN102403957A (en) * | 2011-11-08 | 2012-04-04 | 厦门大学 | Harmonic-free frequency conversion speed adjusting device |
| CN105762799A (en) * | 2014-12-17 | 2016-07-13 | 利思电气（上海）有限公司 | Embedded type active inversion unit |
| CN106712020A (en) * | 2016-12-29 | 2017-05-24 | 江苏越达电力设备有限公司 | Modular design-based active filter device |
| CN106786651A (en) * | 2016-12-29 | 2017-05-31 | 江苏越达电力设备有限公司 | A kind of tuning reactive-load compensation and filter based on intelligent control method |
| CN113328639A (en) * | 2021-07-09 | 2021-08-31 | 四川大学 | High-power electrolytic hydrogen production rectification power supply and control method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |