CN106953326A - A kind of mixing harmonic suppression technique for being applied to class impact load - Google Patents
A kind of mixing harmonic suppression technique for being applied to class impact load Download PDFInfo
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- CN106953326A CN106953326A CN201710309028.7A CN201710309028A CN106953326A CN 106953326 A CN106953326 A CN 106953326A CN 201710309028 A CN201710309028 A CN 201710309028A CN 106953326 A CN106953326 A CN 106953326A
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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
-
- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
-
- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
-
- 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
- Y02E40/30—Reactive power compensation
-
- 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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
A kind of mixing harmonic suppression technique for being applied to class impact load.The present invention relates to a kind of mixing harmonic suppression technique for being applied to class impact load.Alternating current esIt is A phase, B phase, C phase, described alternating current e respectively for three-phasesA be connected impedance ZSInductance L is connected afterwardsAOne end, 7th A ends and No. 1 end of load in 5th A ends, TSF compensating units in TSF compensating units；Described alternating current esB be connected impedance ZSInductance L is connected afterwardsBOne end, 7th B ends and No. 2 ends of load in 5th B ends, TSF compensating units in TSF compensating units；Described alternating current esC be connected impedance ZSInductance L is connected afterwardsCOne end, 7th C and No. 3 ends of load in 5th C-terminal, TSF compensating units in TSF compensating units.The mixing harmonics restraint that the present invention is loaded for impact.
Description
Technical field：
The present invention relates to a kind of mixing harmonic suppression technique for being applied to class impact load.
Background technology：
High power DC electric machine comes into operation in processing manufacturing industry, load shock when being run due to it, perceptual and non-
Linearly, cause substantial amounts of idle harmonic electric current injection power network, have a strong impact on the reliability that other sensitiveness are loaded in supply line
Operation, therefore, many power electronics filters and compensation device come into operation, to improve the quality of power supply.Passive power filter
(Passive PowerFilter, PPF) is widely used due to low cost simple in construction, it can be difficult to solving due to parameter
That fixes and bring mends the hidden danger with current resonance without merits and demerits.Static reacance generator (Static Var Generator, SVG)
Advantage with Dynamic High-accuracy reactive-load compensation, but it sets up cost and increased severely with reactive capability, it is difficult to meet large-power occasions
Economy.
Thyristor switched filter (Thyristor Switch Filter, TSF) is used as thyristor switchable capacitor
The derived product of (Thyristor Switch Filter, TSC), can realize the near of reactive capability by way of 2N is encoded
Linear regulation, while the advantage that can play TSF passage LC series resonances suppresses to flow into the harmonic current of the specific frequency of power network.
But, TSF is unreasonable due to parameter designing when being used alone, or net side parameter change, it is possible to occur in parallel humorous
Shake, safe and reliable operation that is near and amplifying harmonic current harm whole system.Active Power Filter-APF (Active
PowerFilter, APF) suppress power electronic equipment as a kind of high-precision dynamic harmonic, also due to Cost Problems capacity
Limited, moreover, under impact load, it is excessive that APF converter bridge switching parts devices bear current stress, easily damages three phase inverter bridge
Bridge arm, triggers accident.
The content of the invention：
It is to solve it is an object of the invention to provide a kind of mixing harmonic suppression technique for being applied to class impact load
Filtering accuracy is low during TSF isolated operations, it is easy to which resonance occurs for net side, during APF isolated operations, and compensation capacity is limited, switch element
The problem of current stress is excessive, proposes TS-APF mixing compensation systems, makes TSF and APF coordinated operations, while carrying out reactive-load compensation
Harmonic suppresses, and reduces cost, improves precision, strengthening system operational reliability.
Above-mentioned purpose is realized by following technical scheme：
A kind of mixing harmonic suppression technique for being applied to class impact load, alternating current esIt is A phases, B respectively for three-phase
Phase, C phases, described alternating current esA be connected impedance ZSInductance L is connected afterwardsAOne end, 5th A ends in TSF compensating units,
7th A ends and No. 1 end of load in TSF compensating units；
Described alternating current esB be connected impedance ZSInductance L is connected afterwardsBOne end, 5th B ends in TSF compensating units,
7th B ends and No. 2 ends of load in TSF compensating units；
Described alternating current esC be connected impedance ZSInductance L is connected afterwardsCOne end, 5th C-terminal in TSF compensating units,
7th C and No. 3 ends of load in TSF compensating units；
Described inductance LAThe other end connect APF three phase full bridges A ends,
Described inductance LBThe other end connect APF three phase full bridges B ends,
Described inductance LCThe other end connect APF three phase full bridges C-terminal,
Described APF three phase full bridge shunt capacitance C,
Described inductance LAOne end, inductance LBOne end and inductance LCOne end input a signal into signal sampling mould
Block, described electric capacity C is input a signal into signal sampling module,
Signal transmission is given DSP/CPLD control units, described DSP/CPLD control units by described signal sampling module
Signal is delivered separately to IGBT drive circuit and thyristor driving circuit,
Pwm signal is passed to APF three phase full bridges by described IGBT drive circuit, and described thyristor driving circuit was incited somebody to action
Zero switching signal passes to TSF compensating units.
Described inductance LAOne end, inductance LBOne end and inductance LCOne end and TSF compensating units in 5th A ends
It is current sampling signal source between 5th C-terminal in 5th B ends and TSF compensating units in TSF compensating units；
Three ends of described APF three phase full bridges and inductance LAThe other end, inductance LBThe other end and inductance LCThe other end
Between also be current sampling signal source.
A kind of described mixing harmonic suppression technique for being applied to class impact load, PCC three-phase voltages pass voltage
Pass voltage transformer, described voltage transformer is by signal transmission to signal conditioning circuit, and described signal conditioning circuit will
A/D sampling module of the signal transmission to dsp controller, described dsp controller also receives the signal of the signal and keyboard of power supply；
The current signal of threephase load electric current APF outputs passes to current transformer, and described current transformer is breathed out pungent
Pass to signal conditioning circuit, the A/D sampling modules of described signal conditioning circuit by signal transmission to dsp controller；
The temperature signal of IGBT temperature fin passes to temperature detecting module, and described temperature detecting module passes signal
Pass signal conditioning circuit, the A/D sampling modules of described signal conditioning circuit by signal transmission to dsp controller；
The PWM section of described dsp controller is by signal transmission to complex programmable logic device (CPLD), described complexity
Programmable logic device (CPLD) is by signal transmission to light-coupled isolation, and signal is delivered separately to IGBT drivings by described light-coupled isolation
With darlington amplifying circuit, signal transmission is given APF inverter bridges by described IGBT drivings, and described darlington amplifying circuit will be believed
Number pass to TSF passages；
The bus extender GPIO parts of described dsp controller are by signal transmission to relay protection, upper electric protection and report
Alert protection.
A kind of method of work of described mixing harmonic suppression technique for being applied to class impact load, including following step
Suddenly：
Step one：By signal sampling modulate circuit, to PCC three-phase voltages, DC bus-bar voltage, (DC bus-bar voltage refers to
The voltage of APF bus capacitors), the middle line three-phase current and APF three phase full bridges of TSF compensating units and APF three phase full bridges it is defeated
Go out to compensate electric current and sampled and be converted to and can believed for the A/D sampling module acceptables 0-3.3V of dsp chip voltage
Number；
Step 2：Voltage and current signal after sampling conditioning in step one is transferred to control circuit, by based on instantaneous
Idle theoretical reactive current and specific subharmonic current detection method, draw fundamental reactive current and 5,7,11,13,17,19
Subharmonic current；
Step 3：By the fundamental wave reactive power detected, harmonic current respectively with GB/T14549-93 standard comparings, if idle electricity
Stream is exceeded, then sends TSF switching signals by control circuit according to required capacity, then through thyristor driving circuit control TSF compensation
The respective channel of unit completes operating passing zero；
If reactive current is exceeded, switching TSF and APF；If reactive current is not exceeded, TSF and APF switchings are not controlled, this
When TSF it is motionless, APF is unloaded；
Step 4：After the completion of the operating passing zero of TSF compensating units, compare PCC harmonic currents content and GB/T14549-93
Whether standard is crossed the border, if now PCC harmonic currents are more than GB/T14549-93 level threshold values, control APF is sent as required
The size of reactive-load compensation electric current, control circuit sends three-phase drive electricity of the six road pwm signals to APF according to certain dutycycle
Road, controls APF three phase inverter bridges to put into operation after IGBT drive circuit, is further improved on TSF reactive-load compensations basis
PCC power factor.
Beneficial effect：
1. the present invention can realize that dynamic high-efficiency reactive-load compensation harmonic suppresses simultaneously, TSF and net side resonance problems can be suppressed,
Rush of current suffered by three phase inverter bridge switch member can be reduced, greatly improves the operational effect and reliability of system.
2. the TSF and APF of the present invention are installed between load and power network for parallel relationship.So installing, which can inhale, makes TSF
Immediate current surge protection APF switching device when absorbing load changes.
3. the present invention can provide reactive power support and maintain PCC voltage stabilizations, low-order harmonic reduction Harmfulness Caused by Harmonics can be filtered, is improved
The quality of power supply so that the load of all kinds of responsive types and the normal operation of insensitive load in supply line.
4. the TS-APF mixing compensation systems of the present invention are TSF and APF mixed topologies in parallel.In reactive-load compensation angle, TSF
Big reactive capability, low cost, reactive-load compensation near-linear can be realized；In harmonics restraint angle, TSF capacity is big, low cost, resistance to punching
Hit, APF high precisions, dynamic response is fast.TS-APF mixing compensation systems combine two kinds of wave filter advantages, reduce cost, improve essence
Degree, increases reliability.
Brief description of the drawings：
Fig. 1 is TS-APF mixing compensation systems theory structure block diagram of the present invention.
Fig. 2 is TS-APF mixing compensation systems hardware block diagram of the present invention.
Fig. 3 is ip-iq reactive current of the present invention based on Instantaneous Power Theory and specific subharmonic current Cleaning Principle frame
Figure.
Fig. 4 analyzes for TSF resonance principles of the present invention.
Fourier analysis when Fig. 5 is quintuple harmonics resonance of the present invention.
Fig. 6 compares Hysteresis control strategy for the APF timings that the present invention repeats the optimization of prediction reference electric current.
Fig. 7 is main program flow chart of the present invention.
Fig. 8 is interrupt routine flow chart of the present invention.
Fig. 9 is TSF operating passing zeros signal waveforms of the present invention.
Figure 10 is that APF DC bus-bar voltages of the present invention track oscillogram.
Figure 11 is PCC three-phase voltages of the present invention and branch current oscillogram.
Figure 12 is each branch current comparison of wave shape figure after present invention compensation.
Figure 13 is individual harmonic current analysis comparison diagram before and after present invention compensation..
Figure 14 is power factor figure when present system is run.
Figure 15 is electric current total harmonic distortion figure when present system is run.
Embodiment：
Embodiment 1
A kind of mixing harmonic suppression technique for being applied to class impact load, alternating current esIt is A phases, B respectively for three-phase
Phase, C phases, described alternating current esA be connected impedance ZSInductance L is connected afterwardsAOne end, 5th A ends in TSF compensating units,
7th A ends and No. 1 end of load in TSF compensating units；
Described alternating current esB be connected connection inductance L after impedance Z SBOne end, 5th B ends in TSF compensating units,
7th B ends and No. 2 ends of load in TSF compensating units；
Described alternating current esC be connected impedance ZSInductance L is connected afterwardsCOne end, 5th C-terminal in TSF compensating units,
7th C and No. 3 ends of load in TSF compensating units；
Described inductance LAThe other end connect APF three phase full bridges A ends,
Described inductance LBThe other end connect APF three phase full bridges B ends,
Described inductance LCThe other end connect APF three phase full bridges C-terminal,
Described APF three phase full bridge shunt capacitance C,
Described inductance LAOne end, inductance LBOne end and inductance LCOne end input a signal into signal sampling mould
Block, described electric capacity C is input a signal into signal sampling module,
Signal transmission is given DSP/CPLD control units, described DSP/CPLD control units by described signal sampling module
Signal is delivered separately to IGBT drive circuit and thyristor driving circuit,
Pwm signal is passed to APF three phase full bridges by described IGBT drive circuit, and described thyristor driving circuit was incited somebody to action
Zero switching signal passes to TSF compensating units.
Described inductance LAOne end, inductance LBOne end and inductance LCOne end and TSF compensating units in 5th A ends
It is current sampling signal source between 5th C-terminal in 5th B ends and TSF compensating units in TSF compensating units；
Three ends of described APF three phase full bridges and inductance LAThe other end, inductance LBThe other end and inductance LCThe other end
Between also be current sampling signal source.
Signal sampling modulate circuit using voltage sensor collection points of common connection (Point of CommonCoupling,
PCC three-phase voltage), APF compensating unit dc-link capacitance voltages gather TSF and APF middle lines using current transformer
Three-phase current, the three-phase compensation electric current of the exchange leading-out terminal output of the three-phase inversion full-bridge of APF compensating units.Afterwards, letter is passed through
Number modulate circuit level conversion, amplitude limit meet the A/D sample ports for the dsp chip for giving control circuit.Dsp chip passes through computing
Control logic sends control instruction, and the instruction of CPLD chips integral traffic control gives optical coupling isolation circuit again after branch optimization, then,
Signal isolation is exported to thyristor driving circuit and IGBT drive circuit, drives TSF to mend respectively after level conversion and amplification
The IGCT of unit and the IGBT of APF compensating units are repaid, whole system puts into operation.
A kind of described mixing harmonic suppression technique for being applied to class impact load, (PCC refers to load and esBetween public affairs
Tie point altogether) voltage passes to voltage transformer by PCC three-phase voltages, and signal transmission is given signal to adjust by described voltage transformer
Manage circuit, the A/D sampling modules of described signal conditioning circuit by signal transmission to dsp controller, described dsp controller is also
Receive the signal of power supply and the signal of keyboard；
The current signal of threephase load electric current APF outputs passes to current transformer, and described current transformer is breathed out pungent
Pass to signal conditioning circuit, the A/D sampling modules of described signal conditioning circuit by signal transmission to dsp controller；
The temperature signal of IGBT temperature fin passes to temperature detecting module, and described temperature detecting module passes signal
Pass signal conditioning circuit, the A/D sampling modules of described signal conditioning circuit by signal transmission to dsp controller；
The PWM section of described dsp controller is by signal transmission to complex programmable logic device (CPLD), described complexity
Programmable logic device (CPLD) is by signal transmission to light-coupled isolation, and signal is delivered separately to IGBT drivings by described light-coupled isolation
With darlington amplifying circuit, signal transmission is given APF inverter bridges by described IGBT drivings, and described darlington amplifying circuit will be believed
Number pass to TSF passages；
The bus extender GPIO parts of described dsp controller are by signal transmission to relay protection, upper electric protection and report
Alert protection.
APF three phase full bridges refer to that APF includes three inverter bridge legs (this is also compensating unit)；APF output current claims
For compensation electric current；Threephase load electric current refers to the electric current that load is sent.
A kind of method of work of described mixing harmonic suppression technique for being applied to class impact load, it is characterized in that：
Comprise the following steps：
Step one：By signal sampling modulate circuit, to PCC three-phase voltages, DC bus-bar voltage, (DC bus-bar voltage refers to
The voltage of APF bus capacitors), the middle line three-phase current and APF three phase full bridges of TSF compensating units and APF three phase full bridges it is defeated
Go out to compensate electric current and sampled and be converted to and can believed for the A/D sampling module acceptables 0-3.3V of dsp chip voltage
Number；DSP model 2812
Step 2：Voltage and current signal after sampling conditioning in step one is transferred to control circuit, by based on instantaneous
Idle theoretical reactive current and specific subharmonic current detection method, draw fundamental reactive current and 5,7,11,13,17,19
Subharmonic current；
Step 3：By the fundamental wave reactive power detected, harmonic current respectively with GB/T14549-93 standard comparings, if idle electricity
Stream is exceeded, then sends TSF switching signals by control circuit according to required capacity, then through thyristor driving circuit control TSF compensation
The respective channel of unit completes operating passing zero；
If reactive current is exceeded, switching TSF and APF；If reactive current is not exceeded, TSF and APF switchings are not controlled, this
When TSF it is motionless, APF is unloaded；
Step 4：After the completion of the operating passing zero of TSF compensating units, compare PCC harmonic currents content and GB/T14549-93
Whether standard is crossed the border, if now PCC harmonic currents are more than GB/T14549-93 level threshold values, control APF is sent as required
The size of reactive-load compensation electric current, control circuit sends three-phase drive electricity of the six road pwm signals to APF according to certain dutycycle
Road, controls APF three phase inverter bridges to put into operation after IGBT drive circuit, is further improved on TSF reactive-load compensations basis
PCC power factor, APF plays fine setting during this.
Embodiment 2
TSF compensating units introduce amendment system according to the design of LC series resonances formula, and in order to evade and net side resonance point
Number λ, system reliability is improved on the premise of compensation effect is not lost.TSF realizes that operating passing zero reduces the impact of TSF channel currents,
And it takes the lead in putting into TSF, heavy current impact can be absorbed when load behavior changes, to the switching device of APF compensating units
IGBT realizes protection, improves security.
APF compensating units compare Hysteresis control strategy using the timing for repeating the optimization of prediction reference electric current.As a result of
Reference current predicts that compensation electric current hysteresis effect improves, and filter effect improves, and hysteresis current tracking is compared using timing, is switched
Frequency is fixed, and waveform improves, switching frequency 10kHz, fast response time.Detection voltage harmonic wave, as TSF and net side generation resonance
Resonance damping state can be run on, system reliability is improved.Realize that harmonic current is separated so that 5,7,11,13,17,19 times
Harmonic wave can be compensated respectively in any combination, with very high flexibility, if because parameter shift causes some feature time resonance,
This harmonic compensation can be forbidden to reduce resonance influence.
Embodiment 3
TSF compensating unit LC parameter designings and harmonic analysis：
TSF compensating units are based on LC series resonance principals, and design LC parameters reach that harmonic resonance point reaches filter effect, together
It is in capacitive under Shi Jibo, reactive-load compensation can be played a part of.
TSF parameter designings are general using reactive capability as standard, and specifically with n=5, parameter designing is as follows exemplified by 7：
Formula 1：
Formula 2：
Formula 3：
Formula 4：
Formula 1 represents LnAnd CnSelected resonance point is met under parameter n times, n represents resonance point, also illustrate that TSF filtering is logical
The n-th passage in road, LnAnd CnRepresent the filter reactor and filter condenser of n-th passage；ω=2 π, f=100 π；
Formula 2 represent according to the harmonic wave size of different passages distribute reactive capability, wherein, U is that phase voltage virtual value QC is
Total reactive capability QnFor n subchannel reactive capabilities, IhnNth harmonic electric current is represented, Ihi represents the specified electricity of TSF ith passages
Stream；U represents PCC rated voltages；
Formula 3 represents the electric capacity that n subchannels are designed according to reactive capability, λ>1, represent the amendment system of reactor inductance value
Number；
Formula 4 represents revised inductance value, wherein λ>1.Each TSF filtering channels are encoded i.e. according to 8 according to 2N simultaneously,
4,2,1 Proportionality design makes reactive-load compensation as far as possible close to linearisation into 4 passages.
But when parameter designing it is unreasonable, or net side parameter change when, it is possible to occur resonance.As shown in figure 4, such as
Fruit resonance point is just near the characteristic frequency of background harmonicses, then because corresponding parallel impedance is very big, by specific time of power network
Voltage harmonic amplifies, and then produces harmonic current, harm system operation safety.Fig. 5 is with Fluke power quality analyzers scene
Electric current Fourier analysis during 5 resonance of generation of actual measurement.
In order to prevent resonance, resonance point, which is chosen, is typically slightly below theoretical value, i.e., slightly big inductance value, the design of such as 5 subchannels
For 4.90 times, 7 subchannels are designed as 6.85 times, reduce the possibility that resonance occurs；When resonance occurs, it can adopt as shown in Figure 6
Sample harmonic voltage signal, generation APF compensation current-orders, increase system damping suppresses resonance.
APF compensating units bus capacitor and output filter design：
The agent structure of APF compensating units is voltage-source type three-phase full-bridge inverter, wherein bus capacitor and connection reactance
Device each serves as the effect of stable DC busbar voltage and output filtering.
Formula 5：
Formula 6：
Formula 7：
In order to meet APF compensation ability, busbar voltage UdcIt is typically designed as in 2.5 times of phase voltage peak value, formula five
ICmaxThe maximum f of electric current is compensated for APFswitchFor the permissible value of fluctuation that switching frequency Δ Udc is busbar voltage, C is direct current
Bus capacitor value, fswitchFor switching frequency；
As shown in Equation 5, bus capacitor design must is fulfilled for the voltage ripple requirement under corresponding operating mode.Formula 6 and formula 7
Respectively define the lower and upper limit of filter reactor.Wherein, Δ iCmaxOutput current ripple permissible value is represented, formula 6 is represented
Linked reactor value should not be too small, it should meets corresponding output compensation current ripples requirement.Formula 7 is represented for specific time
Harmonic wave linked reactor value does not answer value too small, it should meet corresponding compensation electric current delay requirement.
TS-APF mixing compensation system coordination control strategies：
Completed according to above design content after parameter designing, first according to the reactive current situation detected, determine input
TSF passages, and instructed by controlling circuit to send switching, while calculating PCC voltage harmonics, then APF is humorous in the event of resonance
Shake damping work.Afterwards, each primary current harmonic wave is calculated, APF is put into by the overtone order of required compensation when harmonic current is exceeded
Work., can be with dynamic corrections TSF switching groups so that reactive-load compensation near-linear due to constantly detecting reactive current situation；APF exists
During normal work, prediction is repeated using electric current and improves harmonics restraint precision.It can also be designed and be pre-designed according to actual condition
The distribution of good TSF switchings, and APF running situation, worked according to duty, increase response speed.
Wherein, TSF compensating units using star-like without center line LC tandem-type connections, such as formula 1- formula 4 according to reactive capability and
The principle for avoiding resonance point designs LC specific value, and TSF 5 filtering channels and 7 filtering channels are compiled according to 8,4,2,1
Code is respectively divided into 4 passages.APF compensating units use IGBT for switching device, bus capacitor therein according to offset voltage grade,
Ripple and compensation capacity design, specific design value is as shown in Equation 5；APF output filters use reactor, according to output current
Response speed and current ripples design value, specifically as shown in formula 6- formula 7.
Signal sampling and modulate circuit are sampled by voltage and current sensor to AC and DC amount, are then passed through
Analog circuit is realized to the scaling of sensor output signal and is clamped to 0-3.3V so that sampled signal meets dsp chip A/D ends
Mouth is required.The main control chip for controlling circuit is TMS320F2812, mainly undertakes to sampled signal processing, calculates the humorous of idle amount
Ripple amount, being instructed according to control logic output control for task, CPLD chips be used for the command signal that is sent to DSP carry out branch,
Then moditied processing, which is given, gives optical coupling isolation circuit amplification output, and process part driving is protected and fault detection signal.It is brilliant
Brake tube drive circuit is Darlington mu balanced circuit, and the control level that processing prime is sent sends and meets turn on thyristors condition
Signal.IGBT drive circuit is integrated with binary channels driving kernel, short-circuit protection circuit and power supply supervisory circuit, can produce same
The two-way of bridge arm is complementary and combines the drive signal of dead zone protection, and can IGBT or driving enter protection when breaking down in itself
Concurrently be out of order feedback signal.
Embodiment two：Further illustrate the operation logic of control circuit, TSF compensating units and APF units.
Control circuit mainly assume responsibility for the work that signal transacting and instruction are sent.The data sampled include PCC three-phase electricities
Pressure, the line current between TSF and APF, APF bus capacitors voltage and APF output currents.Above-mentioned signal is sent into after DSP, root
Instantaneous Power Theory is based on according to Fig. 3, for three-phase balanced system, is locked by the use of the voltage of A phases as benchmark by PLL modules
Phase, then handles the three-phase current on TSF the and APF middle lines sampled.Clark conversion is first carried out under three phase coordinate systems
Amount be converted to amount under two-phase rest frame, then be transformed into by Park conversion under two-phase rotating coordinate system, Clark conversion
Converted respectively as shown in formula 8 and formula 9 with Park.
Formula 8：
Formula 9：
Reactive current and the main distinction of each harmonic detection are the difference of Park transformation matrixs, pass through different matrixes
Will, the subharmonic of fundamental wave 5,7,11,13,17 and 19 is separated, the control for TSF and APF afterwards.Low pass filter ring therein
There is latency issue in section, precision and the delay of wave filter can be taken into account by being improved by mean filter.TSF compensating units utilize it
Carry out inductive reactive power electric current when small electromotor even load is run in the characteristic of capacitive under fundamental voltage, utilize LC series resonances former
Reason filters the harmonic current of specific time.
The design mainly selects TSF throwing switching passage according to its reactive capability, selects to close by detection voltage peak value
The suitable switching time, realize that operating passing zero reduces rush of current.APF compensating units are to be realized according to instruction current waveform to instruction
The tracking of electric current, principle is as shown in Figure 6.Because the harmonic current detected is separated according to different tuning number of times, it is possible to
Compensate by several times as needed, the flexibility of compensation is added with this；It can not be mended when certain subharmonic current may cause resonance
Corresponding subharmonic is repaid, the stability of a system is improved.And instruction current and actual current that APF is exported poor one on hardware
Clap, the algorithm that can be predicted by repetition, advanced prediction instruction current, realize that dynamic compensates raising compensation precision in real time.
Embodiment three：Illustrate the carrying out practically strategy of TS-APF mixing compensation systems according to Fig. 7 and Fig. 8.First,
System initialization, and detect corresponding fault detection status position, when system failure, system brings into operation startup interrupt timing
Device.TSF and APF middle line three-phase current sampled values are arrived by A/D first, reactive current is then calculated, if idle big
Then determined to need the passage of switching according to its size in threshold value, then according to PCC voltage conditions after TSF switchings, if occurring resonance
Then APF runs on resonance damping state.
After TSF reliability services, the harmonic current of 5,7,11,13,17,19 times respectively is calculated, if it exceeds threshold value is then
APF is run, using repeating to predict that current hysteresis-band control is compared in timing when APF is run, is first passed through outside the DC bus-bar voltage of d axles
Ring stable DC busbar voltage, then starts inversion output compensation harmonic electric current.Then as the change of load, nothing is constantly detected
Work(electric current and, in real time change TSF input passage ensure reactive-load compensation near-linear, while in real time calculate harmonic current content,
Control APF compensation harmonic number of times and output current size.Whole system ensures that TSF and APF co-ordinations TSF has reactive-load compensation
Ability and the effect for filtering 5,7 subharmonic, APF filter remaining harmonic wave, and such mixed compensation, which can reduce APF capacity, can also increase humorous
Ripple suppresses precision, while TSF can first filter a part of harmonic wave, APF switching device is played a protective role.
Embodiment four：For loaded work piece constant period, the clear and definite system of duty can be with pre-designed TSF
Switching scheme and switching sequential time, and APF working condition, then divided in advance according to the virtual voltage electric current that detects
Working condition with TSF and APF, system and actual condition no-float, are greatly improved response speed.Fig. 9 shows TSF passages
IGCT realizes operating passing zero in IGCT both end voltage zero passage.APF preferentially makes outer voltage work when running, and Figure 10 is straight
Busbar voltage waveform is flowed, direct voltage reference value can be followed and steady-state value is reached.
Figure 11 and Figure 12 is mixing compensation system effect, and TSF passages flow mainly through fundamental reactive current and low-order harmonic,
APF mainly undertakes remaining harmonic filtration task, as shown in figure 13, and electric current total harmonic distortion declines to a great extent after filtering.
Figure 14 and Figure 15 represent reactive-load compensation harmonic inhibition during mixing compensation system operation respectively, are arrived in difference
Operating mode under select different working conditions, power factor is improved, and current harmonic content declines.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
Change, remodeling, addition or replacement that the technical staff in domain is made in the essential scope of the present invention, should also belong to the present invention's
Protection domain.
Claims (3)
1. a kind of mixing harmonic suppression technique for being applied to class impact load, it is characterized in that：Alternating current esIt is respectively for three-phase
A phase, B phase, C phase, described alternating current esA be connected impedance ZSInductance L is connected afterwardsAOne end, 5th in TSF compensating units
7th A ends and No. 1 end of load in A ends, TSF compensating units；
Described alternating current esB be connected impedance ZSInductance L is connected afterwardsBOne end, 5th B ends, TSF in TSF compensating units
7th B ends and No. 2 ends of load in compensating unit；
Described alternating current esC be connected impedance ZSInductance L is connected afterwardsCOne end, 5th C-terminal, TSF in TSF compensating units
7th C and No. 3 ends of load in compensating unit；
Described inductance LAThe other end connect APF three phase full bridges A ends,
Described inductance LBThe other end connect APF three phase full bridges B ends,
Described inductance LCThe other end connect APF three phase full bridges C-terminal,
Described APF three phase full bridge shunt capacitance C,
Described inductance LAOne end, inductance LBOne end and inductance LCOne end input a signal into signal sampling module, institute
The electric capacity C stated is input a signal into signal sampling module,
Signal transmission is given DSP/CPLD control units by described signal sampling module, and described DSP/CPLD control units will be believed
Number IGBT drive circuit and thyristor driving circuit are delivered separately to,
Pwm signal is passed to APF three phase full bridges by described IGBT drive circuit, and described thyristor driving circuit throws zero passage
Cut signal transmission and give TSF compensating units.
Described inductance LAOne end, inductance LBOne end and inductance LCOne end and TSF compensating units in 5th A ends TSF mend
Repay between the B ends of 5th in unit and the C-terminal of 5th in TSF compensating units is current sampling signal source；
Three ends of described APF three phase full bridges and inductance LAThe other end, inductance LBThe other end and inductance LCThe other end between
Also it is current sampling signal source.
2. a kind of mixing harmonic suppression technique for being applied to class impact load according to claim 1, it is characterized in that：
Voltage is passed to voltage transformer by PCC three-phase voltages, and described voltage transformer is by signal transmission to signal conditioning circuit, institute
A/D sampling module of the signal conditioning circuit stated by signal transmission to dsp controller, described dsp controller also receives power supply
Signal and keyboard signal；
The current signal of threephase load electric current APF outputs passes to current transformer, and described current transformer transmits pungent breathe out
To signal conditioning circuit, the A/D sampling modules of described signal conditioning circuit by signal transmission to dsp controller；
The temperature signal of IGBT temperature fin passes to temperature detecting module, and described temperature detecting module gives signal transmission
Signal conditioning circuit, the A/D sampling modules of described signal conditioning circuit by signal transmission to dsp controller；
The PWM section of described dsp controller is by signal transmission to complex programmable logic device (CPLD), and described complexity can be compiled
Journey logic device (CPLD) is by signal transmission to light-coupled isolation, and signal is delivered separately to IGBT and driven with reaching by described light-coupled isolation
Signal transmission is given APF inverter bridges by Islington amplifying circuit, described IGBT drivings, and described darlington amplifying circuit passes signal
Pass TSF passages；
The bus extender GPIO parts of described dsp controller protect signal transmission to relay protection, upper electric protection and alarm
Shield.
3. utilize a kind of work of mixing harmonic suppression technique for being applied to class impact load described in claim 1 or 2
Method, it is characterized in that：Comprise the following steps：
Step one：By signal sampling modulate circuit, to PCC three-phase voltages, DC bus-bar voltage, (it is female that DC bus-bar voltage refers to APF
The voltage of line capacitance), middle line three-phase current and APF three phase full bridges the output compensation of TSF compensating units and APF three phase full bridges
Electric current sampled and be converted to can for dsp chip A/D sampling module acceptables 0-3.3V voltage signal；
Step 2：Voltage and current signal after sampling conditioning in step one is transferred to control circuit, by based on instantaneous reactive
Theoretical reactive current and specific subharmonic current detection method, draws fundamental reactive current and 5,7,11,13,17,19 times humorous
Ripple electric current；
Step 3：By the fundamental wave reactive power detected, harmonic current respectively with GB/T14549-93 standard comparings, if reactive current is super
Mark, then send TSF switching signals, then control TSF compensating units through thyristor driving circuit according to required capacity by control circuit
Respective channel complete operating passing zero；
If reactive current is exceeded, switching TSF and APF；If reactive current is not exceeded, TSF and APF switchings are not controlled, now TSF
Motionless, APF is unloaded；
Step 4：After the completion of the operating passing zero of TSF compensating units, compare PCC harmonic currents content and GB/T14549-93 standards
Whether cross the border, if now PCC harmonic currents are more than GB/T14549-93 level threshold values, control APF sends idle as required
The size of electric current is compensated, control circuit sends three-phase drive circuit of the six road pwm signals to APF according to certain dutycycle, passed through
Control APF three phase inverter bridges to put into operation after IGBT drive circuit, further improve PCC's on TSF reactive-load compensations basis
Power factor.
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| CN107749639A (en) * | 2017-09-30 | 2018-03-02 | 澳门大学 | Mixed type network-connecting generation inverter system equipped with power quality compensation |
| CN107959290A (en) * | 2017-12-27 | 2018-04-24 | 德力西集团仪器仪表有限公司 | A kind of power network harmonic wave management and reactive compensation system and method |
| CN108306307A (en) * | 2017-12-29 | 2018-07-20 | 河南北瑞电子科技有限公司 | A kind of reactive power compensator |
| CN108233393A (en) * | 2018-02-02 | 2018-06-29 | 浙江维格泰电气科技有限公司 | T-shaped three level static of one kind is idle generating system and method |
| CN108667040A (en) * | 2018-05-31 | 2018-10-16 | 浙江大学 | A kind of TSC operation/cutting methods applied to APF and TSC hybrid systems |
| CN109358240A (en) * | 2018-09-13 | 2019-02-19 | 湖北追日电气股份有限公司 | A kind of collecting method for active electric filter device in development process |
| CN109358240B (en) * | 2018-09-13 | 2020-09-11 | 湖北追日电气股份有限公司 | Data acquisition method for active power filter device in development process |
| CN110739703A (en) * | 2019-04-17 | 2020-01-31 | 浙江晟泰电气有限公司 | current lead intervention algorithm, resonance treatment method and system |
| CN110380431A (en) * | 2019-07-25 | 2019-10-25 | 上海良肯电气有限公司 | A kind of multifunction power tuning filtering system and method |
| CN110380431B (en) * | 2019-07-25 | 2021-02-02 | 上海良肯电气有限公司 | Multifunctional electric tuning filtering system and method |
| CN112003505A (en) * | 2020-08-24 | 2020-11-27 | 西京学院 | DSP-based electric bicycle digital control system |
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Application publication date: 20170714 |