CN101726656A - Harmonic current detection and filtration method and device of active power filter - Google Patents
Harmonic current detection and filtration method and device of active power filter Download PDFInfo
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- CN101726656A CN101726656A CN200910265806A CN200910265806A CN101726656A CN 101726656 A CN101726656 A CN 101726656A CN 200910265806 A CN200910265806 A CN 200910265806A CN 200910265806 A CN200910265806 A CN 200910265806A CN 101726656 A CN101726656 A CN 101726656A
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- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
Abstract
The invention relates to a harmonic current detection and filtration method and a device of an active power filter, and the method comprises the following steps: step 1-2, dividing three-phase load current in a power grid into two branches which are the three-phase load current of a first branch and the three-phase load current of a second branch; step 1-3, removing harmonic component current of the three-phase load current of the first branch by a filter, thereby obtaining fundamental component current of the first branch; step 1-4, leading the three-phase load current of the second branch to subtract the fundamental component current of the first branch in the step 1-3, thereby obtaining harmonic signal current; and step 1-5, converting phase of the harmonic signal current in the step 1-4 to harmonic current with the reversed phase in comparison with the phase of the harmonic component current in the three-phase load current and injecting into the power grid, thereby filtering out the harmonic component current in the power grid. The method and the device have the advantages of precisely detecting and filtering the harmonic current in the active power filter.
Description
Technical field
The present invention relates to a kind of harmonic current detection filter method and device of Active Power Filter-APF, belong to quality of power supply control field.
Background technology
In recent years, the generally use of power electronic equipment and nonlinear load, make harmonic current and reactive current inject electrical network in a large number, the safe operation of serious threat electrical network and electrical equipment is used with normal, carries out filtering and compensate more and more being paid attention to by people to harmonic wave is idle.
The use passive filtration unit solves idle and there are many shortcomings in harmonic problem.As the design of passive filter mostly at the harmonic wave of characteristic frequency, can only the specific subharmonic of filtering, exist possibility with electrical network generation resonance; And it is very responsive to electric network impedance and frequency change; Volume is big, loss is big or the like.For addressing this problem, people have done many research and discussions, and what wherein have the meaning represented is Active Power Filter-APF.From present external operating position, utilizing Active Power Filter-APF to carry out harmonic wave and reactive-load compensation is from now on a development trend.
Active Power Filter-APF is the power electronic equipment of a kind of dynamic inhibition harmonic wave and compensating reactive power, it can be to frequency and big or small harmonic wave and idle the compensating that all changes, can remedy the shortcoming of passive filter, acquisition is a kind of desirable compensation harmonic device than the better compensation characteristic of passive filter.
As Active Power Filter-APF, its ultimate principle is to detect the load harmonic wave, injects anti-phase harmonic wave, reaches the purpose of filtering with cancelling out each other of harmonic wave.General Active Power Filter-APF is the voltage source inverter of a Controlled in Current Mode and Based.Output current is to act on the outputting inductance by the voltage that inverter is exported to produce.Fig. 1 is that existing Active Power Filter-APF load current detects, the handling principle block diagram, because load current designs according to peak load, owing to the variation of load, detecting the load current that obtains may be less, certainly will cause the A/D sampled signal less in the middle of the actual process that puts into operation.Although the harmonic current that some load produced is bigger, still proportion is less but compare with the fundamental current of load, the resolution of the superimposed harmonic current signal that therefrom extracts after over-sampling and A/D conversion of harmonic current and fundamental current can be lower, so the harmonic current that samples is compared with transducer range can be too little, cause distortion, thereby influence the compensation effect of Active Power Filter-APF.At present, adopt the way of signal amplification in order to address this problem meeting, but the input range of A/D converter only is about 5V, therefore signal amplification factor can not be improved too much.
Summary of the invention
The purpose of this invention is to provide a kind of can accurately detect and the filtering Active Power Filter-APF in the method and the device of harmonic current.
For achieving the above object, first technical scheme that the present invention adopts is:
A kind of harmonic current detection filter method of Active Power Filter-APF comprises:
Step 1-1, current detection sensor detect the threephase load electric current in the electrical network, the harmonic component electric current that this threephase load electric current comprises the fundametal compoment electric current and produced by load;
Step 1-2, with two branch roads that are divided into of the electric current of threephase load described in the electrical network, be respectively the first branch road threephase load electric current and the second branch road threephase load electric current;
Step 1-3, the first branch road threephase load electric current is removed the harmonic component electric current through wave filter, thereby obtain the first branch road fundametal compoment electric current;
Step 1-4, with the first branch road fundametal compoment current subtraction described in the second branch road threephase load electric current and the step 1-3, obtain the harmonic signal electric current;
Step 1-5, with the phase transition of harmonic signal electric current described in the step 1-4 for described threephase load electric current in the anti-phase harmonic current of harmonic component current phase and inject described electrical network, thereby the harmonic component electric current in the filtering electrical network.
Related content in above-mentioned first technical scheme is explained as follows:
1, in the such scheme, described step 1-3 further may further comprise the steps:
Step 2-1, be that two phase coordinate systems are the two-phase load current under the d-q coordinate system with the first branch road threephase load current transformation under three phase coordinate systems, wherein two phase coordinate systems be with circuit in voltage vector rotate synchronously, the rotation angle frequency is ω
s
Step 2-2, with two phase coordinate systems be the d, q component of two-phase load current under the d-q coordinate system respectively through low-pass filtering module filtering high-frequency harmonic, having obtained two phase coordinate systems is the fundametal compoment electric current of the two-phase load current under the d-q coordinate system;
Step 2-3, be that the fundametal compoment electric current of described two-phase load current under the d-q coordinate system is the fundametal compoment electric current of the threephase load electric current under three phase coordinate systems through three-phase coordinate system transformation module with the fundametal compoment electric current reconstructing of two-phase load current with two phase coordinate systems.
2, in the such scheme, described step 2-2 also comprises: according to the circuit delay time, be d-q coordinate system rotation Δ θ angle with described two phase coordinate systems.
3, in the such scheme, described two phase coordinate systems are that d-q coordinate system rotation Δ θ angle is ω
sTake advantage of the described circuit delay time.
4, in the such scheme, after the described step 1-4, described harmonic signal electric current amplifies through the harmonic current amplifier, obtains high-resolution harmonic signal electric current.
In order to implement said method, second technical scheme that the present invention adopts is: a kind of harmonic current detection filter device of Active Power Filter-APF comprises: power cell, the driving circuit that is connected with this power cell of the out put reactor that is connected with electrical network, the Active Power Filter-APF that is connected with this out put reactor, it is characterized in that: also comprise:
Two-phase coordinate system transformation module, to be used for the threephase load current transformation be that two phase coordinate systems are the two-phase load current under the d-q coordinate system, wherein two phase coordinate systems be with circuit in voltage vector rotate synchronously, the rotation angle frequency is ω
s
Low-pass filtering module, be used for two-phase load current d, the harmonic component electric current filtering separately of q component with two-phase coordinate system transformation module output, thus the fundametal compoment electric current that obtains;
Three-phase coordinate system transformation module, to be used for the fundametal compoment current transformation after handling through low-pass filtering module be the fundametal compoment electric current of the threephase load electric current under three phase coordinate systems;
The PWM generation module, be used to produce the pulse width modulating signal of the power cell of control Active Power Filter-APF;
Subtracter, be used for fundametal compoment current subtraction, obtain the harmonic signal electric current the output of threephase load electric current and three-phase coordinate system transformation module.
Related content in above-mentioned second technical scheme is explained as follows:
1, in the such scheme, a harmonic wave analog to digital converter is between described subtracter and PWM generation module; A load analog to digital converter is connected with the input end of two-phase coordinate system transformation module; First-harmonic analog to digital converter, between three-phase coordinate system transformation module and subtracter.
2, in the such scheme, a harmonic current amplifier is between described subtracter and PWM generation module 211, and this harmonic current amplifier is used for the harmonic signal electric current is amplified, and obtains threephase load current harmonics signal.
Because the technique scheme utilization, the present invention compared with prior art has following advantage and effect:
1, the present invention is obtaining the fundametal compoment of load current, and fundametal compoment is fed back to harmonic current detection link, thereby reduces the distortion that harmonic current detects, and improves the harmonic current compensation effect.
2, the present invention separates the fundametal component in the load current by hardware, and gained harmonic current signal is amplified and carry out analog to digital conversion separately, thereby has improved the resolution that harmonic current detects, and has improved the compensation effect of harmonic current.
3, harmonic current of the present invention is directly obtained by the threephase load electric current, does not need to do any calculating, has avoided the round-off error in the digital computation process, has improved the accuracy of detection of harmonic current.
4, the present invention has added algorithm compensation of delay function in three-phase coordinate system transformation module, can the time-delay that software algorithm produced be compensated, thereby makes the fundametal compoment of output current more accurate.
Description of drawings
Accompanying drawing 1 is existing active power filter structure block diagram;
Accompanying drawing 2 is active power filter structure block diagram among the present invention;
Accompanying drawing 3 is compensation of delay algorithm synoptic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment one: a kind of harmonic current detection filter method of Active Power Filter-APF comprises:
Step 1-1, current detection sensor detect the threephase load electric current in the electrical network, the harmonic component electric current that this threephase load electric current comprises the fundametal compoment electric current and produced by load;
Step 1-2, with two branch roads that are divided into of the electric current of threephase load described in the electrical network, be respectively the first branch road threephase load electric current and the second branch road threephase load electric current;
Step 1-3, the first branch road threephase load electric current is removed the harmonic component electric current through wave filter, thereby obtain the first branch road fundametal compoment electric current, this step 1-3 further may further comprise the steps: step 2-1, be that two phase coordinate systems are the two-phase load current under the d-q coordinate system with the first branch road threephase load current transformation under the three-phase A-B-C coordinate system, wherein two phase coordinate systems be with circuit in voltage vector rotate synchronously, the rotation angle frequency is ω
sStep 2-2, with two phase coordinate systems is the d of two-phase load current under the d-q coordinate system, the q component is respectively through low-pass filtering module filtering high-frequency harmonic, having obtained two phase coordinate systems is the fundametal compoment electric current of the two-phase load current under the d-q coordinate system, step 2-3, the fundametal compoment electric current that with two phase coordinate systems is described two-phase load current under the d-q coordinate system is the fundametal compoment electric current of the threephase load electric current under the three-phase A-B-C coordinate system through three-phase coordinate system transformation module with the fundametal compoment electric current reconstructing of two-phase load current, and according to circuit delay time Δ t, with described two phase coordinate systems is d-q coordinate system rotation Δ θ angle, and this rotation Δ θ angle is ω
sTake advantage of the described circuit delay time;
Step 1-4, with the first branch road fundametal compoment current subtraction described in the second branch road threephase load electric current and the step 1-3, obtain the harmonic signal electric current;
After the step 1-5, described harmonic signal electric current amplifies through the harmonic current amplifier, obtains high-resolution harmonic signal electric current;
Step 1-6, with the phase transition of harmonic signal electric current described in the step 1-5 for described threephase load electric current in the anti-phase harmonic current of harmonic component current phase and inject described electrical network, thereby the harmonic component electric current in the filtering electrical network.
Present embodiment foregoing specific explanations is as follows, as shown in Figure 2, the present invention is made up of power supply 201, current detection sensor 202, nonlinear load 203, load current analog to digital converter 204, fundamental current digital to analog converter 208, harmonic current amplifier 209, harmonic current analog to digital converter 210, digital control chip DSP212, driving circuit 213, APF power cell 214, out put reactor 215.
In digital control chip DSP212, the threephase load current signal is handled by software algorithm.The first step is with the load current signal (i under the three-phase A-B-C coordinate system
La, i
Lb, i
Lc) be transformed to the load current signal (i under the two-phase d-q coordinate system
Ld, i
Lq), wherein d-q coordinate system and voltage vector rotate synchronously, and angular frequency is ω
s, see Fig. 3.The d-q component of load current passes through digital low-pass filtering module 206 filtering high-frequency harmonics respectively under two phase coordinate systems, has just obtained the load current fundametal compoment under the d-q coordinate system.
Load current fundametal compoment under the d-q coordinate system also will be reconstructed into load current fundamental signal (i under the three-phase A-B-C coordinate system with the fundametal compoment of load current through three-phase coordinate system transformation module 207
Af, i
Bf, i
Cf).Load current signal (i under the three-phase A-B-C coordinate system
La, i
Lb, i
Lc) the above-mentioned complex calculation of process obtains the load current fundamental signal (i under the three-phase A-B-C coordinate system in digital control chip (DSP) 212
Af, i
Bf, i
Cf) need to spend certain computing time, and during this period of time, variation has taken place in actual load current, therefore detects the load current fundamental signal that obtains will have certain error, this error causes owing to calculating to delay time.And computing time, time-delay was normally determined, therefore can reduce error by compensation.
There is Fig. 3 to see, when digital control chip DSP212 begins load current signal calculated, d-q coordinate system and load current vector
Be in solid line position, the angle of d-axle and A-axle is θ, current phasor
Getting angle with the d-axle is α.Suppose that be Δ computing time
t, process Δ t is two-phase d '-q ' coordinate system and load current vector after the time
Forward the dotted line position of Fig. 3 respectively to.D '-axle is θ ' with the angle of A-axle, current phasor
Getting angle with d '-axle is α '.Because at Δ
tIn time, therefore the fundametal compoment of load current can think α=α ' to d-q coordinate system phase change is little.So as long as with current phasor
Rotating Δ θ=θ '-θ simultaneously with the d-q coordinate system just can obtain
And d '-q ' coordinate system.With the load current vector
Just can obtain load current fundamental signal (i under the three-phase A-B-C coordinate system of current time carrying out anti-d-q conversion under d '-q ' coordinate system
Af, i
Bf, i
Cf).
Load current fundamental signal (i
Af, i
Bf, i
Cf) obtain the fundamental current signal feedback that is complementary with current detection sensor 202 by fundamental current digital to analog converter 208 and give the another one branch road, see Fig. 2.Threephase load current signal (i
La, i
Lb, i
Lc) deduct threephase load current first harmonics signal (i
Af, i
Bf, i
Cf) just having obtained the harmonic current signal of current time, this signal often is in the sub-fraction of harmonic current analog to digital converter 210 specified inputs.Therefore.
According to the current harmonics of the threephase load comparatively accurately signal (i that obtains
Ah, i
Bh, i
Ch) produce one group and threephase load current harmonics signal (i by PWM generation module 211
Ah, i
Bh, i
Ch) opposite pwm control signal, control through 213 pairs of APF power cells 214 of overdrive circuit again, output voltage will differ from 180 ° electric current injection electrical network with load harmonic current amplitude equal phase through out put reactor 215, thereby play the purpose of filtering electric harmonic.
Embodiment two: a kind of harmonic current detection filter device of Active Power Filter-APF comprises:
The out put reactor 215 that is connected with electrical network;
The power cell 214 of the Active Power Filter-APF that is connected with this out put reactor 215;
The driving circuit 213 that is connected with this power cell 214;
Two-phase coordinate system transformation module 205, to be used for the threephase load current transformation be that two phase coordinate systems are the two-phase load current under the d-q coordinate system, wherein two phase coordinate systems be with circuit in voltage vector rotate synchronously, the rotation angle frequency is ω
s
Low-pass filtering module 206, be used for two-phase load current d, the harmonic component electric current filtering separately of q component with two-phase coordinate system transformation module 205 output, thus the fundametal compoment electric current that obtains;
Three-phase coordinate system transformation module 207, to be used for the fundametal compoment current transformation after handling through low-pass filtering module 206 be the fundametal compoment electric current of the threephase load electric current under the three-phase A-B-C coordinate system;
A harmonic wave analog to digital converter 210 is between described subtracter 217 and PWM generation module 211; A load analog to digital converter 204 is connected with the input end of two-phase coordinate system transformation module; First-harmonic analog to digital converter 208, between three-phase coordinate system transformation module 207 and subtracter 217;
A harmonic current amplifier 209 is between described subtracter 217 and PWM generation module 211, and this harmonic current amplifier 209 is used for the harmonic signal electric current is amplified.
The foregoing description only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (8)
1. the harmonic current detection filter method of an Active Power Filter-APF is characterized in that: comprising:
Step 1-1, current detection sensor detect the threephase load electric current in the electrical network, the harmonic component electric current that this threephase load electric current comprises the fundametal compoment electric current and produced by load;
Step 1-2, the electric current of threephase load described in the electrical network is divided into two branch roads, is respectively the first branch road threephase load electric current and the second branch road threephase load electric current;
Step 1-3, the first branch road threephase load electric current is removed the harmonic component electric current through wave filter, thereby obtain the first branch road fundametal compoment electric current;
Step 1-4, with the first branch road fundametal compoment current subtraction described in the second branch road threephase load electric current and the step 1-3, obtain the harmonic signal electric current;
Step 1-5, with the phase transition of harmonic signal electric current described in the step 1-4 for described threephase load electric current in the anti-phase harmonic current of harmonic component current phase and inject described electrical network, thereby the harmonic component electric current in the filtering electrical network.
2. method according to claim 1 is characterized in that: described step 1-3 further may further comprise the steps:
Step 2-1, be that two phase coordinate systems are the two-phase load current under the d-q coordinate system with the first branch road threephase load current transformation under three-phase (A-B-C) coordinate system, wherein two phase coordinate systems be with circuit in voltage vector rotate synchronously, the rotation angle frequency is ω
s
Step 2-2, with two phase coordinate systems be the d, q component of two-phase load current under the d-q coordinate system respectively through low-pass filtering module filtering high-frequency harmonic, having obtained two phase coordinate systems is the fundametal compoment electric current of the two-phase load current under the d-q coordinate system;
Step 2-3, be that the fundametal compoment electric current of described two-phase load current under the d-q coordinate system is the fundametal compoment electric current of the threephase load electric current under three-phase (A-B-C) coordinate system through three-phase coordinate system transformation module with the fundametal compoment electric current reconstructing of two-phase load current with two phase coordinate systems.
3. method according to claim 2 is characterized in that: described step 2-2 also comprises: according to circuit delay time (Δ t), be d-q coordinate system rotation Δ θ angle with described two phase coordinate systems.
4. method according to claim 3 is characterized in that: described two phase coordinate systems are that d-q coordinate system rotation Δ θ angle is that described rotation angle frequency multiply by the described circuit delay time (Δ t).
5. method according to claim 1 is characterized in that: after the described step 1-4, described harmonic signal electric current amplifies through the harmonic current amplifier, obtains high-resolution harmonic signal electric current.
6. the harmonic current detection filter device of an Active Power Filter-APF comprises: power cell (214), the driving circuit (213) that is connected with this power cell (214) of the out put reactor that is connected with electrical network (215), the Active Power Filter-APF that is connected with this out put reactor (215), it is characterized in that: also comprise:
Two-phase coordinate system transformation module (205), being used for the threephase load current transformation is that two phase coordinate systems are the two-phase load current under the d-q coordinate system, wherein two phase coordinate systems be with circuit in voltage vector rotate synchronously, the rotation angle frequency is ω
s
Low-pass filtering module (206) is used for two-phase load current d, the harmonic component electric current filtering separately of q component with two-phase coordinate system transformation module (205) output, thus the fundametal compoment electric current that obtains;
Three-phase coordinate system transformation module (207), being used for the fundametal compoment current transformation after handling through low-pass filtering module (206) is the fundametal compoment electric current of the threephase load electric current under three-phase (A-B-C) coordinate system;
PWM generation module (211) is used to produce the pulse width modulating signal of the power cell (214) of control Active Power Filter-APF;
Subtracter (217) is used for the fundametal compoment current subtraction with threephase load electric current and three-phase coordinate system transformation module (207) output, obtains the harmonic signal electric current.
7. device according to claim 6 is characterized in that: a harmonic wave analog to digital converter (210) is positioned between described subtracter (217) and the PWM generation module (211); A load analog to digital converter (204) is connected with the input end of two-phase coordinate system transformation module (205); A first-harmonic analog to digital converter (208) is positioned between three-phase coordinate system transformation module (207) and the subtracter (217).
8. device according to claim 6 is characterized in that: a harmonic current amplifier (209) is positioned between described subtracter (217) and the PWM generation module (211), and this harmonic current amplifier (209) is used for the harmonic signal electric current is amplified.
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| CN102684195A (en) * | 2012-05-22 | 2012-09-19 | 浙江大学 | Low pass filter, active power filtering device and harmonic detection method |
| CN102914695A (en) * | 2012-10-11 | 2013-02-06 | 南京亚派科技实业有限公司 | Harmonic detection method with real-time delay compensation function |
| CN103293379A (en) * | 2013-05-23 | 2013-09-11 | 徐州中矿大传动与自动化有限公司 | Effective value based APF (active power filter) harmonic measuring method and control method of direct current side voltage control method thereof |
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| CN201583584U (en) * | 2009-12-28 | 2010-09-15 | 苏州工业园区和顺电气股份有限公司 | Harmonic current detection filter device of active power filter |
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| CN103293379A (en) * | 2013-05-23 | 2013-09-11 | 徐州中矿大传动与自动化有限公司 | Effective value based APF (active power filter) harmonic measuring method and control method of direct current side voltage control method thereof |
| CN103293379B (en) * | 2013-05-23 | 2015-05-27 | 徐州中矿大传动与自动化有限公司 | Effective value based APF (active power filter) harmonic measuring method and control method of direct current side voltage control method thereof |
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| CN108879677A (en) * | 2018-06-08 | 2018-11-23 | 浙江涌原新能科技股份有限公司 | A kind of Intelligent purifying electric net device |
| CN110221239A (en) * | 2019-06-28 | 2019-09-10 | 深圳市锐能微科技有限公司 | Three-phase current detection circuit, method and electric energy computation chip |
| CN112217213A (en) * | 2020-10-24 | 2021-01-12 | 青岛鼎信通讯股份有限公司 | Resonance point real-time calculation method based on APF device |
| CN112798846A (en) * | 2020-12-29 | 2021-05-14 | 联合汽车电子有限公司 | Harmonic current detection system and method for vehicle motor controller |
| CN112798846B (en) * | 2020-12-29 | 2024-03-19 | 联合汽车电子有限公司 | Harmonic current detection system and method for vehicle motor controller |
| CN113267726A (en) * | 2021-06-16 | 2021-08-17 | 江苏大学 | Fault harmonic current detection device and method for permanent magnet synchronous motor |
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| CN113541547B (en) * | 2021-06-24 | 2023-02-24 | 浙江大学 | Method for extracting current harmonic characteristic quantity of built-in permanent magnet synchronous motor |
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