CN109301830A - A kind of Three phase four-wire system active power filtering control method - Google Patents
A kind of Three phase four-wire system active power filtering control method Download PDFInfo
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- CN109301830A CN109301830A CN201811403999.9A CN201811403999A CN109301830A CN 109301830 A CN109301830 A CN 109301830A CN 201811403999 A CN201811403999 A CN 201811403999A CN 109301830 A CN109301830 A CN 109301830A
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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 Three phase four-wire system active power filtering control methods, comprising the following steps: building three-phase four-wire system active power filter circuit；Voltage transformer, current transformer acquisition associated voltage, current signal simultaneously send DSP main control circuit to；The PLL module carries out the cycle count of PGC demodulation and progress 1024 to source side three-phase voltage and sends DSP main control circuit to；The digital signal that DSP main control circuit exports ADC module is handled to obtain six pwm signals of constant frequency and through on overdrive circuit to three-phase IGBT inversion bridge circuit, three-phase IGBT inversion bridge circuit outputs current in AC power source and load, realizes the control function of three-phase four-wire system active power filtering.The present invention can carry out intact cooperation with the existing reactive power compensator of user, have the characteristics that control is flexible, configuration is flexible, good wave filtering effect, power supply quality is improved, environmental protection is beneficial to energy conservation, can be widely used for reactive compensation and the harmonic wave control of low-voltage distribution system.
Description
Technical field
The invention belongs to three-phase and four-line active power filter technical field, especially a kind of Three phase four-wire system electric power
Active power filtering control method.
Background technique
With the continuous development of power electronic technique and the extensive use of a large amount of nonlinear-loads, the harmonic pollution of power grid is asked
It inscribes increasingly severe, not only there is a large amount of single phase rectification load in these loads, there are also extremely complex non-of many harmonic spectrums
In linear load (such as intermediate frequency furnace), especially three-phase and four-line power network use process, power supply quality is not only affected, it is also unfavorable
In energy conservation and environmental protection.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, propose that a kind of design is reasonable, power supply quality is high and energy conservation
The Three phase four-wire system active power filtering control method of environmental protection.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
A kind of Three phase four-wire system active power filtering control method, comprising the following steps:
Step 1, by three-phase IGBT inversion bridge circuit, DSP main control circuit, voltage and current signal Acquisition Circuit and three-phase four
Line power supply, load, which link together, constitutes three-phase four-wire system active power filter；The voltage and current signal Acquisition Circuit packet
Include voltage transformer, current transformer, signal conditioning circuit, ADC module and PLL module；
Step 2, voltage transformer, current transformer detect source side three-phase voltage, load side electric current, filter side three-phase
On electric current, the neutral conductor electric current and source side three-phase current and through signal conditioning circuit processing, ADC module conversion after send DSP to
Main control circuit；
Step 3, PLL module carry out PGC demodulation to source side three-phase voltage, are divided in advance to high-frequency signal and 1024
Frequency dividing, the pulse of 1024 frequency dividing circuit are used to start all the way conversion and control ADC module, and another way carries out 1024 by counter
Cycle count simultaneously sends DSP main control circuit to；
Step 4, DSP main control circuit are handled to obtain under the control of PLL module 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 IGBT inversion bridge circuit, three-phase IGBT
Inversion bridge circuit outputs current in AC power source and load, realizes the control function of three-phase four-wire system active power filtering.
The specific connection relationship of the three-phase four-wire system active power filter are as follows: the three-phase IGBT inverter bridge and power supply
Side three-phase voltage and the neutral conductor are connected, and the current transformer and source side three-phase voltage and the neutral conductor, are filtered load side electric current
Electric current and source side three-phase current are connected on wave device side three-phase current, the neutral conductor, the voltage transformer and source side three-phase
Voltage is connected；The input terminal of PLL module is connected with source side three-phase voltage；Voltage transformer, current transformer and signal
Conditioning circuit is connected, and the output end of signal conditioning circuit is connected with ADC module, the output end of ADC module and DSP main control
Circuit is connected, and the output end of PLL module is connected with DSP main control circuit.
The three-phase IGBT inversion bridge circuit is connected and composed by three phase inverter bridge and capacitor half-bridge.
The PLL module uses fpga chip, is sequentially connected by pre- frequency dividing circuit, 1024 frequency dividing circuits and 1024 counters
It constituting, the 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,
The spirit of 1024 frequency dividing circuits is connected with output end with 1024 counters, 1024 counter outputs and 10 parallactic angle degree pointer modules
It is connected.
The DSP main control circuit includes DSP module, control switch and human-machine interface module, and human-machine interface module passes through
Control switch is connected with DSP module.
The specific processing method of the step 4 are as follows: DSP governor circuit receives after ADC module carries out analog-to-digital conversion
After load side three-phase current, 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 right
It fabricates the three electric current application symmetrical component methods to be added, and carries out obtaining three in the load side phase current except 3 operations
Order harmonic components；Select all harmonic currents to carry out add operations, obtain the instruction current of active filter, then with active power filtering
The actual current of device is compared, and obtains error signal, after amplifier A amplification, then after being compared with triangular signal
Six pwm signals of control active filter are obtained, six road pwm signals control three-phase after overdrive circuit is isolated and is amplified
The work of IGBT inversion bridge circuit.
All harmonic currents of selection are realized by the human-machine interface module in DSP main control circuit, human-machine interface
The working method that mouth mold block allows user according to the virtual condition of load selection active filter by changing switch state.
The advantages and positive effects of the present invention are:
The present invention is mutual by DSP main control circuit, three-phase IGBT inversion bridge circuit and voltage and current signal Acquisition Circuit
It cooperates, man-machine interface or the control of reservation can be passed through according to the practical harmonic pollution situation and reactive requirement situation of load
Policy selection operating mode can carry out intact cooperation with the existing reactive power compensator of user, have and control flexible, configuration
Flexibly, the characteristics of good wave filtering effect, power supply quality is improved, is beneficial to energy conservation environmental protection, can be widely used for low-voltage distribution system
Reactive compensation and harmonic wave control.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention；
Fig. 2 is PLL modular circuit block diagram of the invention；
Fig. 3 is to calculate 2 subharmonic current iah2、ibh2、ich2Schematic diagram；
Fig. 4 is to calculate nth harmonic electric current iahn、ibhn、ichnSchematic diagram；
Fig. 5 is the schematic diagram of control switch；
Fig. 6 is the schematic diagram of DSP main control circuit.
Specific embodiment
The embodiment of the present invention is further described below in conjunction with attached drawing.
A kind of Three phase four-wire system active power filtering control method, comprising the following steps:
Step 1 establishes three-phase four-wire system active power filter as shown in Figure 1, the active filter of three-phase four-wire system electric power
Wave device includes three-phase IGBT inversion bridge circuit 1, DSP main control circuit 2 and voltage and current signal Acquisition Circuit 3, the voltage electricity
Stream signal acquisition circuit 3 is connected with DSP main control circuit 2, which passes through driving circuit and three-phase IGBT
Inversion bridge circuit 1 is connected.Physical circuit connection relationship are as follows:
The voltage and current signal Acquisition Circuit includes voltage transformer, current transformer, signal conditioning circuit, ADC mould
Block and PLL module, voltage transformer, current transformer are connected with signal conditioning circuit, the output end of signal conditioning circuit with
ADC module is connected, and the output end of ADC module is connected with DSP main control circuit 2；The output end of PLL module and DSP master control
Circuit 2 processed.In foregoing circuit, three-phase IGBT inverter bridge 1, voltage and current signal Acquisition Circuit 3 and source side three-phase voltage ua、
ub、ucAnd neutral conductor N is connected, current transformer and load side electric current ila、ilb、ilc, filter side three-phase current ifa、ifb、
ifc, electric current i on the neutral conductorfzAnd source side three-phase current isa、isb、iscIt is connected, voltage transformer and source side three-phase voltage
ua、ub、ucIt is connected；The input terminal and source side three-phase voltage u of PLL modulea、ub、ucIt is connected.
The DSP main control circuit includes DSP module, control switch and human-machine interface module, and human-machine interface module passes through
Control switch is connected with DSP module.
The three-phase IGBT inversion bridge circuit 1 is connected and composed by three phase inverter bridge and capacitor half-bridge.
Step 2, voltage and current signal Acquisition Circuit pass through the three-phase voltage that voltage transformer and current transformer detect
ua、ub、uc, load side electric current ila、ilb、ilc, filter side three-phase current ifa、ifb、ifc, electric current i on the neutral conductorfzAnd source side
Three-phase current isa、isb、iscIt is sent into after signal conditioning circuit and is converted to digital quantity in ADC module and sends DSP main control to
Circuit 2.
Step 3, PLL module are to source side three-phase voltage ua、ub、ucAfter carrying out PGC demodulation, the high-frequency signal of output is carried out
Pre- frequency dividing and 1024 frequency dividings, the pulse of this 1024 frequency dividing circuit go to carry out the starting conversion and control of ADC module, another way all the way
1024 cycle count is carried out by counter.
As shown in Fig. 2, the PLL module is made of FPGA, counted by pre- frequency dividing circuit, 1024 frequency dividing circuits and 1024
Device is sequentially connected composition.For three-phase voltage signal after phase lock circuitry carries out PGC demodulation, the high-frequency signal of output is sent into PLL mould
Pre- frequency dividing and 1024 frequency dividing meters, the pulse signal all the way (ADC changeover control signal) of 1024 frequency dividing circuit output are carried out in block
For the starting conversion and control of ADC module, another way pulse signal is transmitted to following for the progress of the counter inside PLL module 1024
Ring count, PLL module output Q0, Q1 ... Q9 signal connect 10 angle indicators and send DSP main control circuit to.
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. 3 gives the 2 subharmonic extracting methods based on new instantaneous reactive power theory.Inside DSP main control circuit,
According to the current phase angle degree θ of 2 subharmonic voltages2It is constructed using instantaneous reactive power theory and calculates 2 subharmonic currents
iah2、ibh2、ich2.Matrix in figureMatrixMatrix
C23 is the inverse matrix of Matrix C 32, and LPF is direct current low-pass filter.
Fig. 4 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 main control circuit according to nth harmonic voltage current phase angle degree θnUtilize instantaneous reactive function
Rate theory, which constructs, calculates nth harmonic electric current iahn、ibhn、ichn。
Step 4, DSP main control circuit to ADC module output digit signals and the control signal of PLL 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 main control circuit is as follows:
The load side three-phase current i of voltage and current signal Acquisition Circuit acquisitionla、ilb、ilcAnalog-to-digital conversion is carried out by ADC
It reads in DSP afterwards, to a phase current ilaAfter 120 degree and 240 degree of digit shifter (look-up table), realization carries out original a phase
Three-phase is fabricated, and is then added to imaginary three electric current application symmetrical component methods out, and just obtain except 3 operations
Third-harmonic component i in load side a phase currenta0；Similarly, same operation behaviour is carried out to the b phase of load side and c phase current
Make, so that it may obtain the third-harmonic component i in load side b phase currentb0With the third-harmonic component in load side b phase current
ic0。
Human-machine interface module in DSP main control circuit can permit user and select active filter according to the virtual condition of load
The working method of wave device, control switch as shown in Figure 5 load low-capacity electric, can choose control switch and all close
It closes, in this way, active filter just works in full frequency band filter state, for middle large capacity power load, can choose part control
System closes the switch, in this way, active filter can be run according to the scheme of user.For triple-frequency harmonics instruction current signal
Extraction is realized based on improved symmetrical component method, and the extraction for non-triple-frequency harmonics instruction current signal is based on new instantaneous
Reactive power theory is realized.
As shown in figure 5, carrying out add operation according to all harmonic currents that control switch is selected, so that it may obtain active
The instruction current (reference current) of filter, then be compared with the actual current of active filter, error signal has been obtained, then
After amplifier A amplification, 6 pwm signals that can be obtained by control active filter are being compared with triangular signal.
6 road pwm signals are after overdrive 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 (7)
1. a kind of Three phase four-wire system active power filtering control method, it is characterised in that the following steps are included:
Step 1, by three-phase IGBT inversion bridge circuit, DSP main control circuit, voltage and current signal Acquisition Circuit and three-phase and four-line electricity
Source, load, which link together, constitutes three-phase four-wire system active power filter；The voltage and current signal Acquisition Circuit includes electricity
Press mutual inductor, current transformer, signal conditioning circuit, ADC module and PLL module；
Step 2, voltage transformer, current transformer detect source side three-phase voltage, load side electric current, filter side three-phase electricity
Stream electric current and source side three-phase current and sends DSP master to after signal conditioning circuit processing, ADC module conversion on the neutral conductor
Control circuit；
Step 3, PLL module carry out PGC demodulation to source side three-phase voltage, are divided in advance to high-frequency signal and 1024 divide,
The pulse of 1024 frequency dividing circuit is used to start all the way conversion and control ADC module, and another way is carried out 1024 circulation by counter
It counts and sends DSP main control circuit to；
Step 4, DSP main control circuit are handled to obtain constant under the control of PLL module to the digital signal of ADC module output
Six pwm signals of frequency, six pwm signals are through on overdrive circuit to three-phase IGBT inversion bridge circuit, three-phase IGBT inversion
Bridge circuit outputs current in AC power source and load, realizes the control function of three-phase four-wire system active power filtering.
2. a kind of Three phase four-wire system active power filtering control method according to claim 1, it is characterised in that: described
The specific connection relationship of three-phase four-wire system active power filter are as follows: the three-phase IGBT inverter bridge and source side three-phase voltage and
The neutral conductor is connected, the current transformer and source side three-phase voltage and the neutral conductor, load side electric current, filter side three-phase electricity
Electric current and source side three-phase current are connected on stream, the neutral conductor, and the voltage transformer is connected with source side three-phase voltage；
The input terminal of PLL module is connected with source side three-phase voltage；Voltage transformer, current transformer are connected with signal conditioning circuit
It connecing, the output end of signal conditioning circuit is connected with ADC module, and the output end of ADC module is connected with DSP main control circuit,
The output end of PLL module is connected with DSP main control circuit.
3. a kind of Three phase four-wire system active power filtering control method according to claim 1, it is characterised in that: described
Three-phase IGBT inversion bridge circuit is connected and composed by three phase inverter bridge and capacitor half-bridge.
4. a kind of Three phase four-wire system active power filtering control method according to claim 1, it is characterised in that: described
PLL module uses fpga chip, 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.
5. a kind of Three phase four-wire system active power filtering control method according to claim 1, it is characterised in that: described
DSP main control circuit includes DSP module, control switch and human-machine interface module, and human-machine interface module passes through control switch and DSP
Module is connected.
6. a kind of Three phase four-wire system active power filtering control method according to claim 1, it is characterised in that: described
The specific processing method of step 4 are as follows: DSP governor circuit receives the load side three-phase electricity after ADC module carries out analog-to-digital conversion
After stream, 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 to imaginary three out
Electric current application symmetrical component method is added, and carries out obtaining the third-harmonic component in the load side phase current except 3 operations；
It selects all harmonic currents to carry out add operation, obtains the instruction current of active filter, then the practical electricity with active filter
Stream is compared, and obtains error signal, and obtaining control after amplifier A amplification, then after being compared with triangular signal has
Six pwm signals of source filter, six road pwm signals control three-phase IGBT inverter bridge after overdrive circuit is isolated and is amplified
Circuit work.
7. a kind of Three phase four-wire system active power filtering control method according to claim 6, it is characterised in that: described
Selecting all harmonic currents is realized by the human-machine interface module in DSP main control circuit, and human-machine interface module is by changing
Become the working method that switch state allows user to select active filter according to the virtual condition of load.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024066470A1 (en) * | 2022-09-26 | 2024-04-04 | 上海铼钠克数控科技有限公司 | Pwm generation method and circuit, driver control method, electric motor and electric motor system |
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