CN109301831A - Novel triple-frequency harmonics hybrid power filtering method based on symmetrical component method - Google Patents
Novel triple-frequency harmonics hybrid power filtering method based on symmetrical component method Download PDFInfo
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- CN109301831A CN109301831A CN201811404034.1A CN201811404034A CN109301831A CN 109301831 A CN109301831 A CN 109301831A CN 201811404034 A CN201811404034 A CN 201811404034A CN 109301831 A CN109301831 A CN 109301831A
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- 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
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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]
Abstract
The present invention relates to a kind of novel triple-frequency harmonics hybrid power filtering method based on symmetrical component method, comprising the following steps: novel triple-frequency harmonics hybrid power filter circuit of the building based on symmetrical component method；ADC module, which acquires AC power source three-phase current signal, load side three-phase current and three-phase voltage and is converted to digital signal, sends DSP module to；After phase-locked loop circuit carries out PGC demodulation to three-phase voltage signal, pre- divide is carried out by FPGA module, control signal in two tunnels is counted and exported with 1024 frequency dividings；The digital signal that DSP module exports ADC module is handled to obtain two pwm signals of constant frequency, and two pwm signals pass through in IGBT drive circuit to single-phase inverter, by outputing current in AC power source and load for single-phase inverter.The present invention has rational design, solves the problems, such as that active filter cannot effectively track triple harmonic current in three-phase circuit asymmetry situation, improve the efficiency that active filter filters out triple-frequency harmonics.
Description
Technical field
The invention belongs to electric filtering technical field, especially a kind of novel triple-frequency harmonics mixing based on symmetrical component method
Type power filtering method.
Background technique
Since power electronic equipment is using increasingly extensive, and a large amount of nonlinear-loads are widely applied in power distribution network,
The harmonic pollution problems of power grid are got worse, and the harm caused by power distribution network is extremely serious.Not only exist 5,7,11 times in power grid
Etc. types harmonic current, there is also the pollutions of serious triple harmonic current.Since triple-frequency harmonics belongs to zero sequence, the zero sequence circuit
It is low that there is only impedance loops, also often results in Harmonic Amplification Problem, and therefore, triple-frequency harmonics pollution problem is a international big
Problem.
Chinese patent literature " the triple-frequency harmonics Hybrid power filter based on symmetrical component method " (application number
CN201210118234.7, publication number CN102624001A) it can solve the above problems to a certain extent, still, the device
The triple harmonic current on zero curve can not be effectively filtered out in the asymmetric situation of severe three-phase.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, propose a kind of novel humorous three times based on symmetrical component method
Wave hybrid power filtering method, solution active filter in three-phase circuit asymmetry situation cannot effectively track humorous three times
The problem of wave electric current, improves the efficiency that active filter filters out triple-frequency harmonics.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
A kind of novel triple-frequency harmonics hybrid power filtering method based on symmetrical component method, comprising the following steps:
Step 1 locks 5 single tuning passive filters, 7 single tuning passive filters, single-phase inverter, signal acquisition
Mutually and control circuit links together with AC power source, transformer, load and constructs the novel triple-frequency harmonics based on symmetrical component method
Hybrid power filter circuit；
Step 2, ADC module acquire AC power source three-phase current signal, load side three-phase electricity under the control of FPGA module
Stream and three-phase voltage are simultaneously converted to digital signal and send DSP module to；
After step 3, phase-locked loop circuit carry out PGC demodulation to three-phase voltage signal, the high-frequency signal of output is sent into FPGA mould
In block, pre- frequency dividing is carried out by FPGA module and 1024 frequency dividings are counted, the pulse signal all the way of 1024 frequency dividing circuit output is used for ADC
The starting conversion and control of module, another way pulse signal carry out 1024 cycle count by counter, and FPGA module exports Q0、
Q1……Q9Signal connects 10 angle indicators and sends DSP module to；
Digital signal that step 4, DSP module export ADC module simultaneously carries out under the control of the control signal of FPGA module
Processing obtains two pwm signals of constant frequency, and two pwm signals pass through in IGBT drive circuit to single-phase inverter, by list
Phase inverter outputs current in AC power source and load, realizes the function of 3 hybrid power active filters.
The specific connection relationship of the novel triple-frequency harmonics hybrid power filter circuit are as follows: the AC power source, transformation
Device, 5 single tuning passive filters, 7 single tuning passive filters are sequentially connected and connect, 5 single tuning passive filters and 7 times
Single tuning passive filter one end output load side three-phase current is to load, 5 single tuning passive filters and 7 single tunings
The other end of passive filter is connected with single-phase inverter；The signal acquisition locking phase and control circuit include ADC module, lock
Phase loop circuit, DSP module and FPGA module, the ADC module input terminal and AC power source three-phase current, three-phase voltage and negative
Lotus side three-phase current is connected, and the phase-locked loop circuit input terminal is connected with three-phase voltage signal, phase-locked loop circuit output end
It is connected with FPGA module, two control terminals of FPGA are connected with ADC module and DSP module respectively, the DSP module output
The pwm signal of constant frequency is by IGBT drive circuit to single-phase inverter, the output electric current of single-phase inverter is separately connected
To AC power source and load.
The specific processing method of DSP module is as follows in the step 4: DSP module, which is received, carries out modulus turn by ADC module
After load side three-phase current after changing, 120 degree and 240 degree of phase shift are passed through to every phase current, realization mutually carries out three-phase to this and fabricates,
Then imaginary three electric current application symmetrical component methods out are added, and carry out obtaining the load side phase current except 3 operations
In third-harmonic component；Above three electric current is added, the reference current of active filter, then and active power filtering are obtained
The actual output current of device is compared, and obtained difference signal compared with triangular signal, just obtains perseverance after A times of amplification
Determine the pwm signal of frequency；Finally, the pwm signal of two constant frequencies controls triple-frequency harmonics after IGBT drive circuit is amplified
Two IGBT of active power filter work, to realize the function of 3 hybrid power active filters.
The advantages and positive effects of the present invention are:
The present invention has rational design, by 5 single tuning passive filters, 7 single tuning passive filters, single-phase inversions
Device, signal acquisition locking phase and control circuit and AC power source, transformer, load link together, by signal acquisition locking phase and
Control circuit has relatively good filter effect for 5 times or more non-Zero-pharse harmonics, meanwhile, it is capable to operatively reduce filtering
The cost of circuit, triple harmonic current cannot effectively be tracked by efficiently solving active filter in three-phase circuit asymmetry situation
Problem improves the efficiency that active filter filters out triple-frequency harmonics.
Detailed description of the invention
Fig. 1 is the circuit diagram of the novel triple-frequency harmonics hybrid power filter circuit of the invention based on symmetrical component method；
Fig. 2 is the circuit diagram of FPGA module；
Fig. 3 is the principles of signal processing figure of DSP module.
Specific embodiment
The embodiment of the present invention is further described below in conjunction with attached drawing.
A kind of novel triple-frequency harmonics hybrid power filtering method based on symmetrical component method, comprising the following steps:
Step 1, the building novel triple-frequency harmonics hybrid power filter circuit based on symmetrical component method as shown in Figure 1.
In this step, need by 5 times and 7 single tuning passive filters 1, single-phase inverter 2, signal acquisition locking phase and
Control circuit 3 and AC power source, transformer and load link together, and to constitute the novel triple-frequency harmonics based on symmetrical component method mixed
Mould assembly power filter circuit.Specific connection method are as follows:
The AC power source, transformer, 5 single tuning passive filters, 7 single tuning passive filters are connected, and 5 times
Single tuning passive filter, 7 single tuning passive filter one end output load side three-phase current ila、ilb、ilcIt is connected with load
Connect, 5 single tuning passive filters, 7 single tuning passive filters the other end be connected with single-phase inverter 2.It is described
Signal acquisition locking phase and control circuit 3 include ADC module, phase-locked loop circuit, DSP module and FPGA module, and the ADC module is defeated
Enter end and AC power source three-phase current signal, load side three-phase current ila、ilb、ilcAnd three-phase voltage Ua, Ub, Uc are connected,
The control terminal of ADC module is connected with FPGA module, and the output end of ADC module is connected with DSP module.The phase-locked loop circuit
Input terminal is connected with three-phase voltage signal, and the output end of phase-locked loop circuit is connected with FPGA module, two controls of FPGA
End is connected with ADC module and DSP module respectively, and the pwm signal of the DSP module output constant frequency is by IGBT driving electricity
On road to single-phase inverter 2, the output electric current i of single-phase inverter 2zfIt is respectively connected in AC power source and load.
In the present embodiment, 5 single tuning passive filters, 7 single tuning passive filters are hub-and-spoke configuration.It is described
Single-phase inverter 2 is made of IGBT capacitor half-bridge.
Step 2, ADC module acquire AC power source three-phase current signal, load side three-phase electricity under the control of FPGA module
Flow ila、ilb、ilcAnd it three-phase voltage Ua, Ub, Uc and is converted to digital signal and sends DSP module to.
After step 3, phase-locked loop circuit carry out PGC demodulation to three-phase voltage signal, the high-frequency signal of output is sent into FPGA mould
In block, pre- frequency dividing is carried out by FPGA module and 1024 frequency dividings are counted, (ADC turns the pulse signal all the way of 1024 frequency dividing circuit output
Change control signal) it is used for the starting conversion and control of ADC module, another way pulse signal is transmitted to the counter inside FPGA module
1024 cycle count is carried out, FPGA module exports Q0、Q1……Q9Signal connects 10 angle indicators and sends DSP module to.
Digital signal that step 4, DSP module export ADC module simultaneously handle in the control signal of FPGA module
Pwm signal to constant frequency passes through in IGBT drive circuit to single-phase inverter, by the output electric current i of single-phase inverter 2zfPoint
It is not connected in AC power source and load.
In this step, the specific processing method of DSP module is as follows:
As shown in figure 3, load side three-phase current ila、ilb、ilcIt is read in DSP module after ADC carries out analog-to-digital conversion,
DSP module is to a phase current ilaAfter 120 degree and 240 degree of digit shifter (look-up table), realization carries out three-phase to original a phase
It fabricates, then imaginary three electric current application symmetrical component methods out is added, and carry out just having obtained load except 3 operations
Third-harmonic component i in a phase current of sidea0；Similarly, same arithmetic operation is carried out to the b phase of load side and c phase current, just
Third-harmonic component i in available load side b phase currentb0With the third-harmonic component i in load side b phase currentc0；Again
These three electric currents are added, the reference current i of active filter is obtainedfl=ia0+ib0+ic0, then the reality with active filter
Border exports electric current izfIt is compared, obtained difference signal is after A times of amplification compared with triangular signal, so that it may obtain perseverance
Determine the pwm signal of frequency.The pwm signal of two constant frequencies can control triple-frequency harmonics after IGBT drive circuit is amplified
Two IGBT of active power filter work, to realize the function of 3 hybrid power active filters.
It is emphasized that embodiment of the present invention be it is illustrative, without being restrictive, therefore packet of the present invention
Include and be not limited to embodiment described in specific embodiment, it is all by those skilled in the art according to the technique and scheme of the present invention
The other embodiments obtained, also belong to the scope of protection of the invention.
Claims (3)
1. a kind of novel triple-frequency harmonics hybrid power filtering method based on symmetrical component method, it is characterised in that including following step
It is rapid:
Step 1, by 5 single tuning passive filters, 7 single tuning passive filters, single-phase inverter, signal acquisition locking phase and
Control circuit and AC power source, transformer, load novel triple-frequency harmonics of the building based on symmetrical component method that link together mix
Type power filter circuit；
Step 2, ADC module acquired under the control of FPGA module AC power source three-phase current signal, load side three-phase current with
And it three-phase voltage and is converted to digital signal and sends DSP module to；
After step 3, phase-locked loop circuit carry out PGC demodulation to three-phase voltage signal, the high-frequency signal of output is sent into FPGA module
In, pre- frequency dividing is carried out by FPGA module and 1024 frequency dividings are counted, the pulse signal all the way of 1024 frequency dividing circuit output is used for ADC mould
The starting conversion and control of block, another way pulse signal carry out 1024 cycle count by counter, and FPGA module exports Q0、
Q1……Q9Signal connects 10 angle indicators and sends DSP module to；
Digital signal that step 4, DSP module export ADC module is simultaneously handled under the control of the control signal of FPGA module
Two pwm signals of constant frequency are obtained, two pwm signals pass through in IGBT drive circuit to single-phase inverter, by single-phase inverse
Become outputing current in AC power source and load for device, realizes the function of 3 hybrid power active filters.
2. the novel triple-frequency harmonics hybrid power filtering method according to claim 1 based on symmetrical component method, special
Sign is: the specific connection relationship of the novel triple-frequency harmonics hybrid power filter circuit are as follows: the AC power source, transformation
Device, 5 single tuning passive filters, 7 single tuning passive filters are sequentially connected and connect, 5 single tuning passive filters and 7 times
Single tuning passive filter one end output load side three-phase current is to load, 5 single tuning passive filters and 7 single tunings
The other end of passive filter is connected with single-phase inverter；The signal acquisition locking phase and control circuit include ADC module, lock
Phase loop circuit, DSP module and FPGA module, the ADC module input terminal and AC power source three-phase current, three-phase voltage and negative
Lotus side three-phase current is connected, and the phase-locked loop circuit input terminal is connected with three-phase voltage signal, phase-locked loop circuit output end
It is connected with FPGA module, two control terminals of FPGA are connected with ADC module and DSP module respectively, the DSP module output
The pwm signal of constant frequency is by IGBT drive circuit to single-phase inverter, the output electric current of single-phase inverter is separately connected
To AC power source and load.
3. the novel triple-frequency harmonics hybrid power filtering method according to claim 1 or 2 based on symmetrical component method,
Be characterized in that: the specific processing method of DSP module is as follows in the step 4: DSP module, which is received, carries out modulus by ADC module
After load side three-phase current after conversion, 120 degree and 240 degree of phase shift are passed through to every phase current, realization mutually carries out three-phase void to this
Then structure is added imaginary three electric current application symmetrical component methods out, and carry out obtaining the load side phase except 3 operations
Third-harmonic component in electric current；Above three electric current is added, obtains the reference current of active filter, then with it is active
The actual output current of filter is compared, and obtained difference signal compared with triangular signal, obtains after A times of amplification
The pwm signal of constant frequency；Finally, the pwm signal of two constant frequencies controlled after IGBT drive circuit is amplified it is humorous three times
Two IGBT of wave active power filter work, to realize the function of 3 hybrid power active filters.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1841876A (en) * | 2005-12-18 | 2006-10-04 | 江苏省电力公司无锡供电公司 | Mixed THF based on symmetrical component method |
| US20080219035A1 (en) * | 2007-03-05 | 2008-09-11 | Wu Chin-Chang | Active Power Filter |
| CN108390384A (en) * | 2018-03-23 | 2018-08-10 | 国网福建省电力有限公司福州供电公司 | A kind of novel reactive-load compensation and harmonic treating apparatus |
| CN108418219A (en) * | 2018-03-23 | 2018-08-17 | 国网福建省电力有限公司福州供电公司 | Mixed type reactive-load compensation based on FFT and harmonic treating apparatus |
-
2018
- 2018-11-23 CN CN201811404034.1A patent/CN109301831A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1841876A (en) * | 2005-12-18 | 2006-10-04 | 江苏省电力公司无锡供电公司 | Mixed THF based on symmetrical component method |
| US20080219035A1 (en) * | 2007-03-05 | 2008-09-11 | Wu Chin-Chang | Active Power Filter |
| CN108390384A (en) * | 2018-03-23 | 2018-08-10 | 国网福建省电力有限公司福州供电公司 | A kind of novel reactive-load compensation and harmonic treating apparatus |
| CN108418219A (en) * | 2018-03-23 | 2018-08-17 | 国网福建省电力有限公司福州供电公司 | Mixed type reactive-load compensation based on FFT and harmonic treating apparatus |
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