CN109449942A - A kind of novel hybrid power active power filtering method - Google Patents
A kind of novel hybrid power active power filtering method Download PDFInfo
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- CN109449942A CN109449942A CN201811404110.9A CN201811404110A CN109449942A CN 109449942 A CN109449942 A CN 109449942A CN 201811404110 A CN201811404110 A CN 201811404110A CN 109449942 A CN109449942 A CN 109449942A
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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]
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Abstract
The present invention relates to a kind of novel hybrid power active power filtering methods, comprising the following steps: No. 7 passive filters, three-phase inversion bridge circuit, DSP control circuit and three phase mains, load link together and constitute novel hybrid power active filter circuit；Three-phase voltage, load side electric current, filter side three-phase current and source side three-phase current are carried out digital conversion and send DSP module to by ADC module；After FPGA module carries out PGC demodulation to source side three-phase voltage, ADC module and DSP module are output control signals to；DSP control circuit exports on six pwm signals to three-phase inversion bridge circuit.The present invention has rational design, uses instantaneous reactive power theory to carry out the extraction of harmonic current signal, has the characteristics that control is flexible, configuration is convenient and harmonic environment is adaptable.
Description
Technical field
The invention belongs to active power filter technical field, especially a kind of novel hybrid power active power filtering side
Method.
Background technique
With the extensive application of nonlinear-loads a large amount of in the continuous development and electric system of power electronic technique, power grid
Harmonic pollution problems are increasingly severe, and also many nonlinear-loads (such as intermediate frequency furnace) harmonic spectrum is extremely complex, therefore, non-
Often it is necessary to carry out comprehensive treatment.And current Active Power Filter Technology not can effectively solve complexity there is adaptability is poor
Harmonic wave control problem under harmonic environment.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, propose a kind of novel hybrid power active power filtering side
Method solves the problems, such as the harmonic wave control under complicated harmonic environment.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
A kind of novel hybrid power active power filtering method, comprising the following steps:
No. 7 passive filters, three-phase inversion bridge circuit, DSP control circuit and three phase mains, load are connected to by step 1
Novel hybrid power active filter circuit is constituted together；No. the 7 passive filter both ends are separately connected three phase mains and three
Phase inversion bridge circuit；DSP control circuit includes ADC module, FPGA module, DSP module, control switch and human-machine interface module,
FPGA module is connected with ADC module, DSP module respectively, and ADC module is connected with DSP module, and human-machine interface module passes through control
System switch is connected with DSP module, and DSP module is connected through drive module with three-phase inversion bridge circuit；
Step 2, ADC module are under the control of FPGA module by three-phase voltage, load side electric current, filter side three-phase current
And source side three-phase current carries out digital conversion and sends DSP module to；
After step 3, FPGA module carry out PGC demodulation to source side three-phase voltage, the high-frequency signal of output is divided in advance
With 1024 frequency dividings, the pulse of 1024 frequency dividing circuit goes to carry out the starting conversion and control of ADC module all the way, and another way is by counter
It carries out 1024 cycle count and sends DSP module to；
Step 4, DSP control circuit are handled to obtain under FPGA module control to the digital signal of ADC module output
Six pwm signals of constant frequency, six pwm signals are through on overdrive circuit to three-phase inversion bridge circuit, three phase inverter bridge is electric
Road outputs current in AC power source and load, realizes three phase mains active power filtering function.
No. 7 passive filters are made of three groups of concatenated inductance capacitances, three groups of concatenated inductance capacitance one end difference
Three phase mains is connected, the other end connects three-phase inversion bridge circuit.
The three-phase inversion bridge circuit is made of three phase inverter bridge and capacitance connection.
The FPGA module is sequentially connected and is constituted by pre- frequency dividing circuit, 1024 frequency dividing circuits and 1024 counters, described pre-
Frequency dividing circuit is connected with phase-locked loop circuit, and an output end of 1024 frequency dividing circuits is connected with ADC module, 1024 frequency dividing circuits
Spirit be connected with output end with 1024 counters, 1024 counter outputs are connected with 10 parallactic angle degree pointer modules.
The specific processing method of the step 4 are as follows: DSP module is carried out according to all harmonic currents that control switch is selected
Add operation obtains the instruction current of active filter, then is compared with the actual current of active filter, obtains error letter
Number, after amplifier A amplification, then it is compared with triangular signal to obtain six pwm signals of control active filter, six
A pwm signal is after overdrive circuit is isolated and is amplified, control three-phase inversion bridge circuit work.
The advantages and positive effects of the present invention are:
The present invention carries out the extraction of harmonic current signal using instantaneous reactive power theory, has and controls flexible, configuration
Convenient and the adaptable feature of harmonic environment, the user smaller for user capacity, can be directly used this kind it is novel
Hybrid power active filter carry out corresponding reactive compensation and harmonic wave control；For the user of intermediate size, can adopt
With the active and passive method combined, allows passive filter to undertake 5,7 inferior harmonic currents greatly and the harmonic wave for being easy to filter out is controlled
Reason, allows active filter to undertake the control of special subharmonic；For the user of middle large capacity, equally can using active and
The passive method combined allows passive filter to undertake the harmonic wave control that 5,7 inferior harmonic currents are big and are easy to filter out, and allows more
Active filter undertakes the control of each special harmonic wave respectively, for example arranges an active filter to filter out 2 subharmonic
Electric current arranges an active filter to filter out 4 subharmonic currents etc..
Detailed description of the invention
Fig. 1 is circuit diagram of the invention；
Fig. 2 is to calculate 2 subharmonic current iah2、ibh2、ich2Schematic diagram；
Fig. 3 is to calculate nth harmonic electric current iahn、ibhn、ichnSchematic diagram；
Fig. 4 is the circuit block diagram of FPGA module；
Fig. 5 is the schematic diagram of DSP control circuit.
Specific embodiment
The embodiment of the present invention is further described below in conjunction with attached drawing.
A kind of novel hybrid power active power filtering method, comprising the following steps:
Step 1 establishes novel hybrid power active filter circuit as shown in Figure 1, and the novel hybrid power is active
Filter circuit include No. 7 passive filters 1, three-phase inversion bridge circuit 2, DSP control circuit 3, No. 7 passive filters 1,
DSP control circuit 3 is connected by drive module with three-phase inversion bridge circuit 2.Physical circuit connection relationship are as follows:
No. 7 passive filters 1 are by concatenated La、Ca, concatenated Lb、CbAnd concatenated Lc、CcIt constitutes, concatenated La、
Ca, concatenated Lb、CbAnd concatenated Lc、CcOne end is separately connected three phase mains ua、ub、uc, other end connection three-phase inversion bridge circuit
2。
The DSP control circuit 3 includes ADC module, FPGA module, DSP module, control switch and human-machine interface module,
Human-machine interface module is connected by control switch with DSP module, and ADC module is under the control of FPGA module by three-phase voltage
ua、ub、uc, load side electric current ila、ilb、ilc, filter side three-phase current ifa、ifb、ifcAnd source side three-phase current isa、isb、
iscIt is converted to digital quantity and exports to DSP module, FPGA module output control signal controls ADC module and DSP module respectively.
The input terminal and source side three-phase voltage u of FPGA modulea、ub、ucIt is connected.
The three-phase inversion bridge circuit 2 is made of three phase inverter bridge and capacitance connection.
Step 2, ADC module are under the control of FPGA module by three-phase voltage ua、ub、uc, load side electric current ila、ilb、ilc,
Filter side three-phase current ifa、ifb、ifcAnd source side three-phase current isa、isb、iscIt carries out digital conversion and sends DSP mould to
Block.
Step 3, FPGA module are to source side three-phase voltage ua、ub、ucAfter carrying out PGC demodulation, the high-frequency signal of output into
The pre- frequency dividing of row and 1024 frequency dividings, the pulse of this 1024 frequency dividing circuit goes to carry out the starting conversion and control of ADC module all the way, another
Route the cycle count that counter carries out 1024.
In this patent, 1024 loop count represents the angle, θ of current time fundamental voltage phase1, from this angle
Degree signal can successively be inferred to the current phase angle degree θ of 2 subharmonic voltages2, 4 subharmonic voltage signals current phase angle degree
θ4, 5 subharmonic voltage signals current phase angle degree θ5Etc..
Fig. 2 gives the 2 subharmonic extracting methods based on new instantaneous reactive power theory.Inside DSP control circuit, press
According to the current phase angle degree θ of 2 subharmonic voltages2It is constructed using instantaneous reactive power theory and calculates 2 subharmonic current iah2、
ibh2,ich2.Matrix in figureMatrixMatrix C 23
For the inverse matrix of Matrix C 32, LPF is direct current low-pass filter.
Fig. 3 give based on new instantaneous reactive power theory nth harmonic extracting method (n include 2,4,5,7,8,10,
11,13,14,16,19 etc.).DSP control circuit according to nth harmonic voltage current phase angle degree θnUtilize instantaneous reactive power
Theory building, which goes out, calculates nth harmonic electric current iahn、ibhn、ichn°
As shown in figure 4, the FPGA module is made of FPGA, by pre- frequency dividing circuit, 1024 frequency dividing circuits and 1024 meters
Number device is sequentially connected composition.Three-phase voltage signal after phase lock circuitry carries out PGC demodulation, be sent by the high-frequency signal of output
Pre- frequency dividing and 1024 frequency dividing meters, (the ADC conversion and control of pulse signal all the way of 1024 frequency dividing circuit output are carried out in FPGA module
Signal) it is used for the starting conversion and control of ADC module, another way pulse signal is transmitted to the progress of the counter inside FPGA module
1024 cycle count, FPGA module output Q0, Q1 ... Q9 signal connect 10 angle indicators and send DSP control electricity to
Road.
Step 4, DSP control circuit to ADC module output digit signals and the control signal of FPGA module control under into
Row processing obtains the pwm signal of constant frequency, and the pwm signal is through on overdrive circuit to three-phase IGBT inverter bridge, by single-phase inverse
Become outputing current in AC power source and load for device, realizes the control function of three-phase four-wire system active power filtering.
In this step, the specific processing method of DSP control circuit is as follows:
Man-machine interface in DSP control circuit can permit user and select active power filtering according to the virtual condition of load
The working method of device, control switch as shown in Figure 5 load low-capacity electric, can choose control switch and are all closed,
In this way, active filter just works in full frequency band filter state, for middle large capacity power load, it can choose part control and open
It closes and closes, in this way, active filter can be run according to the scheme of user.
Add operation will be carried out according to all harmonic currents that control switch is selected in Fig. 5, so that it may obtain active filter
The instruction current (reference current) of wave device, then be compared with the actual current of active filter, error signal is obtained, then pass through
After crossing amplifier A amplification, then six pwm signals that can be obtained by control active filter are compared with triangular signal.
Six pwm signals are after IGBT drive circuit is isolated and is amplified, so that it may IGBT be driven to work.
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 (5)
1. a kind of novel hybrid power active power filtering method, it is characterised in that the following steps are included:
Step 1 links together No. 7 passive filters, three-phase inversion bridge circuit, DSP control circuit and three phase mains, load
Constitute novel hybrid power active filter circuit；No. the 7 passive filter both ends are separately connected three phase mains and three contraries
Become bridge circuit；DSP control circuit includes ADC module, FPGA module, DSP module, control switch and human-machine interface module, FPGA
Module is connected with ADC module, DSP module respectively, and ADC module is connected with DSP module, and human-machine interface module is opened by control
Pass is connected with DSP module, and DSP module is connected through drive module with three-phase inversion bridge circuit；
Step 2, ADC module are under the control of FPGA module by three-phase voltage, load side electric current, filter side three-phase current and electricity
Source three-phase current carries out digital conversion and sends DSP module to；
After step 3, FPGA module carry out PGC demodulation to source side three-phase voltage, the high-frequency signal of output carry out pre- frequency dividing and
1024 frequency dividing, the pulse of 1024 frequency dividing circuit go all the way carry out ADC module starting conversion and control, another way by counter into
The cycle count of row 1024 simultaneously sends DSP module to；
Step 4, DSP control circuit are handled to obtain constant under FPGA module control to the digital signal of ADC module output
Six pwm signals of frequency, six pwm signals through on overdrive circuit to three-phase inversion bridge circuit, three-phase inversion bridge circuit
It outputs current in AC power source and load, realizes three phase mains active power filtering function.
2. novel hybrid power active power filtering method according to claim 1, it is characterised in that: 7 passive filterings
Device is made of three groups of concatenated inductance capacitances, and three groups of concatenated inductance capacitance one end are separately connected three phase mains, other end connection
Three-phase inversion bridge circuit.
3. novel hybrid power active power filtering method according to claim 1, it is characterised in that: the three phase inverter bridge electricity
It routes three phase inverter bridge and capacitance connection is constituted.
4. novel hybrid power active power filtering method according to claim 1, it is characterised in that: the FPGA module is by pre-
Frequency dividing circuit, 1024 frequency dividing circuits and 1024 counters are sequentially connected composition, and the pre- frequency dividing circuit is connected with phase-locked loop circuit
It connects, an output end of 1024 frequency dividing circuits is connected with ADC module, and the spirit of 1024 frequency dividing circuits is with output end and 1024 counters
It is connected, 1024 counter outputs are connected with 10 parallactic angle degree pointer modules.
5. a kind of novel hybrid power active power filtering method according to claim 1, it is characterised in that: the step 4
Specific processing method are as follows: DSP module carries out add operation according to all harmonic currents that control switch is selected, and obtains active filter
The instruction current of wave device, then be compared with the actual current of active filter, error signal is obtained, is amplified by amplifier A
Afterwards, then with triangular signal it is compared to obtain six pwm signals of control active filter, six pwm signals are through overdriving
After circuit is isolated and is amplified, control three-phase inversion bridge circuit work.
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Citations (6)
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|---|---|---|---|---|
| US5757099A (en) * | 1996-03-01 | 1998-05-26 | Wisconsin Alumni Research Foundation | Hybrid parallel active/passive filter system with dynamically variable inductance |
| CN102624001A (en) * | 2012-04-20 | 2012-08-01 | 上海润珏机电科技有限公司 | Hybrid electric filtering device based on triple harmonic active filter |
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| 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 |
| CN207994629U (en) * | 2018-03-23 | 2018-10-19 | 国网福建省电力有限公司福州供电公司 | A kind of connection of the circuit of novel reactive-load compensation and harmonic treating apparatus |
-
2018
- 2018-11-23 CN CN201811404110.9A patent/CN109449942A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| US5757099A (en) * | 1996-03-01 | 1998-05-26 | Wisconsin Alumni Research Foundation | Hybrid parallel active/passive filter system with dynamically variable inductance |
| CN102624001A (en) * | 2012-04-20 | 2012-08-01 | 上海润珏机电科技有限公司 | Hybrid electric filtering device based on triple harmonic active filter |
| CN108336737A (en) * | 2018-03-23 | 2018-07-27 | 国网福建省电力有限公司福州供电公司 | A kind of active harmonics generator |
| 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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