CN106026185A - Three-level subway energy feedback and harmonic control integrated device and control method thereof - Google Patents
Three-level subway energy feedback and harmonic control integrated device and control method thereof Download PDFInfo
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- CN106026185A CN106026185A CN201610619661.1A CN201610619661A CN106026185A CN 106026185 A CN106026185 A CN 106026185A CN 201610619661 A CN201610619661 A CN 201610619661A CN 106026185 A CN106026185 A CN 106026185A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a three-level subway energy feedback and harmonic control integrated device and a control method thereof. The integrated device comprises an integrated power converter and a control system which are sequentially connected, the direct current side of the integrated power converter is hung between a positive busbar and a negative busbar of a direct current contact network in a subway supply network, and the alternating current side of the integrated power converter comprises three phases which are connected to low voltage side three phase lines of a rectifier transformer of an alternating current network in the subway supply network. Smooth switching of the two working modes including subway energy feedback and harmonic control is achieved through the integrated device, and therefore not only is subway braking energy fully utilized, but also harmonic control is taken into account; meanwhile, a three-level inversion technique is adopted, regenerated energy is directly fed back to the low voltage side of the traction rectifier transformer without needing a feedback transformer, and therefore the cost of an energy feedback device can be significantly reduced; harmonic pollution control over the alternating current side of the subway supply network is achieved by intelligently recognizing the subway running work condition and intelligently detecting existence of harmonic currents.
Description
Technical field
The present invention relates to the device and method of a kind of energy feedback and harmonic wave control, particularly relate to a kind of three electricity
Level land ferrum energy feedback and harmonic wave control integrated apparatus and control method thereof, belong to metro braking energy feedback
With harmonic wave control technical field.
Background technology
In recent years, subway has become as big city people and goes on a journey requisite mode, and it has as one
Large Copacity, the vehicles of high speed play very important role in Construction of Urban Rail Traffic.Fast
Violent Urban Rail Transit Development is increasing to electric power energy demand, also puies forward the quality of power supply and efficiency simultaneously
Go out higher requirement.
Subway can effectively alleviate the transport pressure of urban transportation, also reduces pollution emission etc. simultaneously and asks
Topic；But also bring a lot of other problem, owing to the distance between subway station is short, locomotive brake frequent, system
Energy is very big, thus causes metro braking distance the longest, and braking time is the most long.General subway is in braking
Time can by energy feedback to power supply network, if but feedback energy can not completely by other vehicles or electrical equipment profit
Used time, line voltage pump liter can be caused, the line voltage entail dangers to station equipment that pump rises, it is unfavorable for subway
Safe operation.Meanwhile, subway system mainly uses direct current supply, and its ac bus voltage is through exchange
Transformer pressure-reducing, then by uncontrollable diode rectification to subway traction power supply, inevitably result from one
A little harmonic currents, serious harmonic pollution can affect the quality of power supply of power supply of urban orbit traffic network, and
The problems such as grid power loss increase, shortened equipment life, ground protection malfunction can be caused.
At present, the absorption plant used both at home and abroad mainly has resistance energy-dissipating type, accumulation energy type and low pressure inversion feedback
Type these three.
Resistance energy-dissipating type is to utilize absorption resistance by the energy of generation during metro braking with the form consumption of heat energy
Falling, this is the most common method that uses both at home and abroad.This method mature and reliable, and control to get up conveniently,
But it primary disadvantage is that braking energy can only can not be used with form of thermal energy consumption, cause the energy
Waste, and in the heat energy changed can cause tunnel, ambient temperature raises, and needs to set up corresponding ventilation unit,
Considerably increase electric energy loss.This kind of scheme is runed counter to energy-conserving and environment-protective theme, does not also meet subway light-weighted
Demand for development.
Accumulation energy type is to be absorbed in energy storage device by braking energy, and energy storage device mostly typically is flywheel or capacitor
Group.When subway train braking, by kinetic energy storage in flywheel or Capacitor banks；When subway Acceleration of starting takes
During stream, the energy of storage is discharged.The major defect of accumulation energy type scheme is that energy storage device is not enough to completely
Absorb braking energy, and energy storage device is bulky, is limited by Metro Space, maintenance is installed the most multiple
Miscellaneous, high cost.
Low pressure inversion feedback type is to use three-phase inverter, and the DC inverter produced during metro braking is become work
Frequently alternating current is fed back on 380V supplementary AC electrical network.But owing to instantaneous power during braking is the highest, low pressure
Inverter cannot meet the requirement of track traffic.
In order to realize the requirement of energy-conserving and environment-protective, make full use of regenerated energy, it is necessary to propose a kind of new design
Scheme overcomes the defect of above all schemes.
Summary of the invention
Present invention is primarily targeted at, overcome deficiency of the prior art, it is provided that a kind of three level subway energy
Amount feedback and harmonic wave control integrated apparatus and control method thereof, not only can to subway train braking time carry out energy
Amount feedback, and the harmonic pollution problems of electric power supply system for subway can be solved, it is achieved subway energy feedback and harmonic wave
Administer taking over seamlessly of two kinds of mode of operations, have the value in industry.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of three level subway energy feedbacks and harmonic wave control integrated apparatus, including the integration being sequentially connected
Power inverter and control system, the DC side of described integration power inverter is thrown and is hung in subway power supply net
Between the positive and negative bus of direct current contact net, the AC of integration power inverter is three-phase, connects respectively
In subway power supply net in the low-pressure side triple line of the rectifier transformer of AC network.
Wherein, described integration power inverter is used for when subway is in on-position the Brake Energy accessed
Amount feeds back to the AC network of subway power supply net, i.e. runs on energy feedback pattern after carrying out inversion, or on ground
Ferrum is in when the harmonic current of AC network in normal operating condition subway power supply net exceeds standard to produce and reversely mends
Repay electric current with offset harmonic current and the AC network of distortion is compensated be sinusoidal wave, i.e. run on harmonic wave control
Pattern.
And, described control system is used for controlling integration power inverter and cuts when subway is in on-position
Shift to energy feedback pattern put into operation, or exchange in subway is in normal operating condition and subway power supply net
Switch to standby mode when electrical network is without harmonic current suspend, or be in normal operating condition and subway confession at subway
In electrical network, the harmonic current of AC network automatically switches to harmonic wave control pattern and puts into operation when exceeding standard.
The present invention is further arranged to: described integration power inverter includes three-level VSI,
It is connected to the electric capacity between three-level VSI and direct current contact net, and is connected to three level voltages
Wave filter between type inverter and rectifier transformer.
The present invention is further arranged to: described three-level VSI includes being distributed in parallel connection of common three-phase
Three brachium pontis, each brachium pontis all includes four IGBT pipe, four fly-wheel diodes and two clamper two poles
Pipe；Four IGBT pipes of each brachium pontis are sequentially connected in series, and constitute and are positioned at dividing successively of adjacent two IGBT pipes
The upper brachium pontis of cloth, bridge arm and lower brachium pontis；The equal connected control system of gate pole of four IGBT pipes of each brachium pontis
Drive end, each fly-wheel diode of each brachium pontis is all connected anti-parallel to the two ends of each IGBT pipe, often
Two clamp diodes of individual brachium pontis are connected anti-parallel between brachium pontis and lower brachium pontis after being sequentially connected in series, three bridges
The bridge arm of arm is connected by wire.
The present invention is further arranged to: described electric capacity includes the first electric capacity and the second electric capacity being sequentially connected in series, the
It is in parallel with three brachium pontis after one electric capacity and the second capacitances in series, one end of the first electric capacity and direct current contact net
Positive bus-bar is connected, the other end of the first electric capacity is connected between two clamp diodes, one end of the second electric capacity
Be connected with the other end of the first electric capacity, the other end of the second electric capacity is connected with the negative busbar of direct current contact net.
The present invention is further arranged to: described wave filter includes the first inductance, the second inductance and the 3rd inductance,
One end of first inductance, the second inductance and the 3rd inductance bridge arm with three brachium pontis respectively is connected, the first electricity
The other end of sense, the second inductance and the 3rd inductance is connected in the low-pressure side triple line of rectifier transformer.
The present invention is further arranged to: described control system includes that the controller being sequentially connected, PWM occur
Device and drive module, and all with A/D sampling module and the I/O circuit of controller both-way communication.
Wherein, described A/D sampling module, for gathering data and the data of collection being transferred to controller；
Wherein, the data of collection include the voltage of direct current contact net, the electric current of AC network low-pressure side and harmonic current,
And the AC signal of integration power inverter；Described controller, for receiving the data of collection and carrying out
Data process, it is thus achieved that subway real-time working condition and export real-time control signal；Wherein, subway real-time working condition includes
On-position, without the normal operating condition of harmonic current with there is the normal operating condition of harmonic current, in real time
Control signal includes energy feedback signal, standby halt signal and harmonic wave control signal.
And, described PWM generator, for generating correspondence according to the real-time control signal of controller output
PWM ripple；Described driving module, as the drive end of control system, is used for amplifying PWM and occurs
The PWM ripple that device generates, and the PWM ripple of amplification is transferred to integration power inverter
Control end to drive integration power inverter to put into operation；Described I/O circuit includes input circuit and output
Circuit, input circuit is for receiving input signal and the high level of input signal being converted to low level input control
Device processed, output circuit receives the control signal of controller and is normal work by the low transition of control signal
Voltage signal output.
The present invention is further arranged to: described control system also includes the communication module being connected with controller, institute
State communication module to communicate for being set up with host computer by controller；Described controller includes using dsp chip
DSP master controller and use fpga chip FPGA pilot controller, described DSP master controller
It is sequentially connected with FPGA pilot controller and is connected with A/D sampling module respectively；Described DSP master control
Device processed processes for data and then judges subway real-time working condition and selects control signal；Described FPGA assists control
Device processed is for logical process and then generates PWM waveform.
The present invention also provides for the controlling party of a kind of three level subway energy feedbacks and harmonic wave control integrated apparatus
Method, comprises the following steps:
1) trigger voltage of default direct current contact net, real by the A/D sampling module in control system
Time detection direct current contact net voltage, the controller in control system by gather direct current contact net voltage and system
The trigger voltage set compares, and judges that whether direct current contact net voltage is more than trigger voltage；
The most then judge that subway real-time working condition is on-position, then perform step 2)；
If it is not, then perform step 3)；
2) controller starts energy feedback algorithm, generates energy feedback modulating wave, through PWM generator and
Driving module output energy feedback signal, energy feedback signal sends into integration power inverter with energy feedback
Pattern puts into operation, and integration power inverter feeds back to subway after the braking energy accessed is carried out inversion and supplies
The AC network of electrical network；
3) the electric current adverse current of direct current contact net being detected in real time when A/D sampling module, controller judges subway
Real-time working condition is normal operating condition；
Detected the electric current of AC network low-pressure side in real time by A/D sampling module, controller judges harmonic current
Whether exceed standard；
The most then perform step 4)；
If it is not, then controller blocks pwm pulse output at once so that integration power inverter enters to be treated
Machine pattern；
4) controller starts harmonic compensation algorithm, generates harmonic component modulating wave, through PWM generator and
Driving module to export actual compensating control signal, integration power inverter puts into operation, produces Contrary compensation
The AC network of distortion is compensated as sine wave by electric current with counteracting harmonic current.
The control method of the present invention is further arranged to: described step 3) in controller judge harmonic current
Whether exceed standard, specifically,
The three-phase current of AC network low-pressure side 3-1) collected is respectively ia、ibAnd ic, sit through abc/dq
Mark conversion, obtains watt current i of AC network low-pressure sidedWith reactive current iq；
3-2) watt current idWith reactive current iqBy leaving DC component after low pass filter, then through sitting
Mark inverse transformation obtains three-phase fundamental current and is respectively iaf、ibfAnd icf；
3-3) three-phase current of the AC network low-pressure side collected is individually subtracted calculated three-phase base
Ripple electric current, obtaining three-phase current harmonic component is iha、ihbAnd ihc；
3-4) when three-phase current harmonic component iha、ihbAnd ihcDuring more than zero, then judge to there is harmonic current,
Contrast first-harmonic value simultaneously, it may be determined that current distortion degree；
When three-phase current harmonic component iha、ihbAnd ihcDuring equal to zero, then judge without harmonic current.
The control method of the present invention is further arranged to: described step 4) specifically,
4-1) by watt current i of AC network low-pressure sidedWith meritorious reference current Id *Carry out PI regulation, will
The reactive power electric current i of AC network low-pressure sideqWith idle reference current Iq *Carry out PI regulation, then pass through
With three-phase current harmonic component i after dq/abc conversionha、ihbAnd ihcIt is calculated the modulation of PWM modulation signal
Ripple；
4-2) controller generates PWM waveform, through PWM according to the modulating wave of PWM modulation signal than calculating
Generator and driving module export actual compensating control signal, and actual compensating control signal exports three level electricity
The IGBT pipe of die mould inverter, utilizes the shutoff of opening of each brachium pontis IGBT pipe to produce and harmonic current size
Contrary compensation electric current i equal, in opposite directions, it is used for offsetting harmonic current, the AC network of distortion is mended
Repay as sine wave.
Compared with prior art, the invention have the advantages that:
1, the present invention is by the setting of a set of integrated apparatus, achieves subway energy and return in set of device
Feedback takes over seamlessly with two kinds of mode of operations of harmonic wave control, is possible not only to make full use of metro braking energy, also
Device for harmonic is administered and the function of reactive-load compensation, is filtered subway power supply network, achieves many things at one stroke.
2, the integrated apparatus that the present invention provides uses tri-level inversion technology, it is possible to meet metro braking
Energy feedback is to the demand of medium voltage network, and two traditional Level Technology can only feed back to about 0.4kV electrical network；
Simultaneously because regenerated energy is directly fed back to the low-pressure side of traction rectifier transformer, so without feedback transformation
Device, can be greatly reduced the cost of energy back feed device；And there is no absorption resistance, it is not required that energy storage device,
Make full use of the regenerated energy that metro braking produces, drastically increase energy utilization rate, also improve simultaneously
Power quality problem.
3, the control method that the present invention provides can the operating condition of Intelligent Recognition subway, in metro braking operating mode
Under, control system starts energy feedback module and completes the recycling of braking energy；At subway accidental conditions
And when there is harmonic current, running harmonic compensation algorithm, the harmonic pollution completing subway power supply net AC is controlled
Reason.
Foregoing is only the general introduction of technical solution of the present invention, in order to be better understood upon the technology hands of the present invention
Section, the invention will be further described below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the electrical connection signal of the present invention three level subway energy feedback and harmonic wave control integrated apparatus
Figure；
Fig. 2 is that the present invention three level subway energy feedback becomes with integrated power in harmonic wave control integrated apparatus
The circuit diagram of parallel operation；
Fig. 3 is the present invention three level subway energy feedback and the knot of control system in harmonic wave control integrated apparatus
Structure block diagram；
Fig. 4 is the stream of the present invention three level subway energy feedback and the control method of harmonic wave control integrated apparatus
Cheng Tu；
Fig. 5 is that the present invention three level subway energy feedback is humorous with the control method of harmonic wave control integrated apparatus
Ripple compensates the flow chart controlled.
Detailed description of the invention
Below in conjunction with Figure of description, the present invention is further illustrated.
The present invention provides a kind of three level subway energy feedbacks and harmonic wave control integrated apparatus, as it is shown in figure 1,
Including the integrated power inverter 1 being sequentially connected and control system 2, described integration power inverter 1
DC side throw hang in subway power supply net between the positive and negative bus of direct current contact net, integration power conversion
The AC of device 1 is three-phase, is connected to the low pressure of the rectifier transformer of AC network in subway power supply net
In the triple line of side.
Described integration power inverter 1 is for entering the braking energy accessed when subway is in on-position
Feed back to the AC network of subway power supply net after row inversion, i.e. run on energy feedback pattern, or at subway
In normal operating condition subway power supply net, the harmonic current of AC network produces Contrary compensation electricity when exceeding standard
Flow to offset harmonic current and the AC network compensation of distortion is sine wave, i.e. runs on harmonic wave control mould
Formula.
Described control system 2 is used for controlling integration power inverter 1 and switches when subway is in on-position
Put into operation to energy feedback pattern, or alternating current in subway is in normal operating condition and subway power supply net
Switch to standby mode when net is without harmonic current suspend, or be in normal operating condition and subway power supply at subway
In net, the harmonic current of AC network automatically switches to harmonic wave control pattern and puts into operation when exceeding standard.
The one three level subway energy feedback that the present invention provides and harmonic wave control integrated apparatus, by one
Change power inverter 1 and the setting of control system 2, not only by metro braking energy feedback to medium voltage network,
Also electrical network AC harmonic wave is compensated improvement simultaneously, take full advantage of subway regenerating braking energy, also solve
Determine harmonic pollution, the power quality problem of the low electric power system of awaiting a subway of power factor, thus ensured that subway arranges
Car runs safely and reliably.
As in figure 2 it is shown, described integration power inverter 1 includes three-level VSI 3, connect
Electric capacity between three-level VSI 3 and direct current contact net, and it is connected to three level voltage types
Wave filter between inverter 3 and rectifier transformer.
Described three-level VSI 3 includes three brachium pontis of distribution, the Mei Geqiao in parallel connection of common three-phase
Arm all includes four IGBT pipes, four fly-wheel diodes and two clamp diodes；Four of each brachium pontis
IGBT pipe is sequentially connected in series, and constitutes and is positioned at the upper brachium pontis being sequentially distributed of adjacent two IGBT pipes, bridge arm
With lower brachium pontis；The drive end of the equal connected control system of gate pole of four IGBT pipes of each brachium pontis, each brachium pontis
Each fly-wheel diode be all connected anti-parallel to the two ends of each IGBT pipe, two clampers two of each brachium pontis
Pole pipe is connected anti-parallel to after being sequentially connected in series between brachium pontis and lower brachium pontis, and the bridge arm of three brachium pontis passes through wire
It is connected.
As a example by the first brachium pontis, it includes IGBT pipe VT11、VT12、VT13And VT14, fly-wheel diode VD11、
VD12、VD13And VD14, clamp diode VD1And VD2.IGBT pipe VT11、VT12、VT13And VT14Go here and there successively
Connection, it is achieved turning on and off of inversion branch road；VT11And VT12Between be upper brachium pontis, VT12And VT13Between be in
Brachium pontis, VT13And VT14Between be lower brachium pontis.Fly-wheel diode VD11、VD12、VD13And VD14Respectively with IGBT
Pipe VT11、VT12、VT13And VT14Reverse parallel connection, for IGBT pipe VT11、VT12、VT13And VT14Have no progeny in pass
Afterflow.Two clamp diode VD1And VD2It is connected anti-parallel between brachium pontis and lower brachium pontis, by IGBT
Pipe VT11、VT12、VT13And VT14Switching voltage be limited in
Described electric capacity includes the first electric capacity C being sequentially connected in series1With the second electric capacity C2, the first electric capacity C1With the second electricity
Hold C2It is in parallel with three brachium pontis after series connection, the first electric capacity C1The positive bus-bar phase of one end and direct current contact net
Even, the first electric capacity C1The other end be connected to two clamp diode VD1And VD2Between, the second electric capacity C2's
One end and the first electric capacity C1The other end be connected, the second electric capacity C2The negative busbar of the other end and direct current contact net
It is connected.
Described wave filter includes the first inductance L1, the second inductance L2 and the 3rd inductance L3, the first inductance L1,
One end of second inductance L2 and the 3rd inductance L3 bridge arm with three brachium pontis respectively is connected, the first inductance
L1, the other end of the second inductance L2 and the 3rd inductance L3 are connected to the low-pressure side three of rectifier transformer
In phase line.
As it is shown on figure 3, described control system 2 includes the controller being sequentially connected, PWM generator and drives
Dynamic model block, all with A/D sampling module and the I/O circuit of controller both-way communication, and is connected with controller
Communication module；Described controller includes the DSP master controller using dsp chip and uses FPGA core
The FPGA pilot controller of sheet, described DSP master controller and FPGA pilot controller be sequentially connected,
And be connected with A/D sampling module respectively.
Described A/D sampling module, for gathering data and the data of collection being transferred to controller；Wherein,
Gather data include the voltage of direct current contact net, the electric current of AC network low-pressure side and harmonic current and
The AC signal of integration power inverter.
Described controller, for receiving the data of collection and carry out data process, it is thus achieved that subway real-time working condition and
Output real-time control signal；Wherein, subway real-time working condition includes on-position, transports without the normal of harmonic current
Row state and the normal operating condition that there is harmonic current, real-time control signal includes energy feedback signal, treats
Machine halt signal and harmonic wave control signal.Described DSP master controller processes for data and then judges subway
Real-time working condition and selection control signal；Described FPGA pilot controller is used for logical process and then generation
PWM waveform.
Described PWM generator, for generating corresponding PWM according to the real-time control signal of controller output
Modulating wave.
Described driving module is as the drive end of control system, for amplifying the PWM that PWM generator generates
Modulating wave, and the PWM ripple of amplification is transferred to the control end of integration power inverter to drive one
Body power inverter puts into operation.
Described I/O circuit includes input circuit and output circuit, and input circuit is used for receiving input signal and inciting somebody to action
The high level of input signal is converted to low level input controller, and output circuit receives the control signal of controller
And the voltage signal that the low transition of control signal is normal work is exported.
Described communication module communicates for being set up with host computer by controller.
The present invention also provides for the controlling party of a kind of three level subway energy feedbacks and harmonic wave control integrated apparatus
Method, as shown in Figure 4, comprises the following steps:
1) trigger voltage of default direct current contact net, real by the A/D sampling module in control system
Time detection direct current contact net voltage, the controller in control system by gather direct current contact net voltage and system
The trigger voltage set compares, and judges that whether direct current contact net voltage is more than trigger voltage；
The most then judge that subway real-time working condition is on-position, then perform step 2)；
If it is not, then perform step 3).
2) controller starts energy feedback algorithm, generates energy feedback modulating wave, through PWM generator and
Driving module output energy feedback signal, energy feedback signal sends into integration power inverter with energy feedback
Pattern puts into operation, and integration power inverter feeds back to subway after the braking energy accessed is carried out inversion and supplies
The AC network of electrical network.
3) the electric current adverse current of direct current contact net being detected in real time when A/D sampling module, controller judges subway
Real-time working condition is normal operating condition；
Detected the electric current of AC network low-pressure side in real time by A/D sampling module, controller judges harmonic current
Whether exceed standard；
The most then perform step 4)；
If it is not, i.e. harmonic current G=0, then controller blocks pwm pulse output at once so that integration
Power inverter suspends entrance standby mode.
Wherein, controller judges whether harmonic current exceeds standard, as it is shown in figure 5, specifically,
The three-phase current of AC network low-pressure side 3-1) collected is respectively ia、ibAnd ic, sit through abc/dq
Mark conversion (being square frame C32 shown in Fig. 5), obtains watt current i of AC network low-pressure sidedWith idle electricity
Stream iq；
3-2) watt current idWith reactive current iqBy leaving DC component, then warp after low pass filter LPF
Cross coordinate inverse transformation (for square frame C23 shown in Fig. 5), obtain three-phase fundamental current and be respectively iaf、ibfAnd icf；
3-3) three-phase current of the AC network low-pressure side collected is individually subtracted calculated three-phase base
Ripple electric current, obtaining three-phase current harmonic component is iha、ihbAnd ihc；
3-4) when three-phase current harmonic component iha、ihbAnd ihcDuring more than zero, then judge to there is harmonic current G,
Contrast first-harmonic value simultaneously, it may be determined that current distortion degree；
When three-phase current harmonic component iha、ihbAnd ihcDuring equal to zero, then judge without harmonic current G.
4) controller starts harmonic compensation algorithm, generates harmonic component modulating wave, through PWM generator and
Driving module to export actual compensating control signal, integration power inverter puts into operation, produces Contrary compensation
The AC network of distortion is compensated as sine wave by electric current with counteracting harmonic current.
As it is shown in figure 5, step 4) specifically,
4-1) by watt current i of AC network low-pressure sidedWith meritorious reference current Id *Carry out PI regulation, will
The reactive power electric current i of AC network low-pressure sideqWith idle reference current Iq *Carry out PI regulation, then pass through
With three-phase current harmonic component i after dq/abc conversionha、ihbAnd ihcIt is calculated the modulation of PWM modulation signal
Ripple；
4-2) controller calculates according to the modulating wave of PWM modulation signal and generates PWM waveform, through PWM
Generator and driving module export actual compensating control signal, and actual compensation controls harmonic wave control signal and exports
The IGBT pipe of three-level VSI, utilizes the shutoff of opening of each brachium pontis IGBT pipe to produce and harmonic wave
The Contrary compensation electric current i that size of current is equal, in opposite directions, it is used for offsetting harmonic current, by the friendship of distortion
Stream power network compensation is sinusoidal wave.
The innovative point of the present invention is, realizes subway energy feedback and harmonic wave control by a set of integrated apparatus
Taking over seamlessly of two kinds of mode of operations, is possible not only to make full use of metro braking energy, goes back device for harmonic and administers
Function；It uses tri-level inversion technology, it is possible to meet metro braking energy feedback to medium voltage network
Demand, is directly fed back to the low-pressure side of traction rectifier transformer, it is not necessary to fly-back transformer by regenerated energy, can
The cost of energy back feed device is greatly reduced；And use Intelligent Recognition subway circulation operating mode and detection harmonic current
Existence exceeds standard situation, when subway is properly functioning and exist harmonic current exceed standard time, take over seamlessly to harmonic wave
Governance model, the harmonic pollution completing subway power supply net AC is administered.
The above, be only presently preferred embodiments of the present invention, not makees the present invention any pro forma
Limit, although the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any
Those skilled in the art, in the range of without departing from technical solution of the present invention, when available the disclosure above
Technology contents make a little change or be modified to the Equivalent embodiments of equivalent variations, as long as being without departing from this
The content of bright technical scheme, any simply the repairing above example made according to the technical spirit of the present invention
Change, equivalent variations and modification, all still fall within the range of technical solution of the present invention.
Claims (10)
1. a level subway energy feedback and harmonic wave control integrated apparatus, it is characterised in that: include
The integrated power inverter being sequentially connected and control system, the DC side of described integration power inverter is thrown
Hang in subway power supply net between the positive and negative bus of direct current contact net, the AC of integration power inverter
For three-phase, it is connected in the low-pressure side triple line of the rectifier transformer of AC network in subway power supply net；
Described integration power inverter is for entering the braking energy accessed when subway is in on-position
Feed back to the AC network of subway power supply net after row inversion, i.e. run on energy feedback pattern, or at subway
In normal operating condition subway power supply net, the harmonic current of AC network produces Contrary compensation electricity when exceeding standard
Flow to offset harmonic current and the AC network compensation of distortion is sine wave, i.e. runs on harmonic wave control mould
Formula；
Described control system is used for controlling integration power inverter and switches to when subway is in on-position
Energy feedback pattern puts into operation, or AC network in subway is in normal operating condition and subway power supply net
In time without harmonic current, switches to standby mode and suspends, or is in normal operating condition and subway power supply net at subway
The harmonic current of middle AC network automatically switches to harmonic wave control pattern and puts into operation when exceeding standard.
Three level subway energy feedbacks the most according to claim 1 and harmonic wave control integrated apparatus,
It is characterized in that: described integration power inverter includes three-level VSI, is connected to three level
Electric capacity between voltage source inverter and direct current contact net, and it is connected to three-level VSI and whole
Wave filter between convertor transformer.
Three level subway energy feedbacks the most according to claim 2 and harmonic wave control integrated apparatus,
It is characterized in that: described three-level VSI includes three brachium pontis of distribution in parallel connection of common three-phase,
Each brachium pontis all includes four IGBT pipes, four fly-wheel diodes and two clamp diodes；
Four IGBT pipes of each brachium pontis are sequentially connected in series, and constitute and are positioned at dividing successively of adjacent two IGBT pipes
The upper brachium pontis of cloth, bridge arm and lower brachium pontis；The equal connected control system of gate pole of four IGBT pipes of each brachium pontis
Drive end, each fly-wheel diode of each brachium pontis is all connected anti-parallel to the two ends of each IGBT pipe, often
Two clamp diodes of individual brachium pontis are connected anti-parallel between brachium pontis and lower brachium pontis after being sequentially connected in series, three bridges
The bridge arm of arm is connected by wire.
Three level subway energy feedbacks the most according to claim 3 and harmonic wave control integrated apparatus,
It is characterized in that: described electric capacity includes the first electric capacity and the second electric capacity being sequentially connected in series, the first electric capacity and second
It is in parallel with three brachium pontis after capacitances in series, one end of the first electric capacity is connected with the positive bus-bar of direct current contact net,
The other end of the first electric capacity is connected between two clamp diodes, one end of the second electric capacity and the first electric capacity
The other end is connected, the other end of the second electric capacity is connected with the negative busbar of direct current contact net.
Three level subway energy feedbacks the most according to claim 3 and harmonic wave control integrated apparatus,
It is characterized in that: described wave filter includes the first inductance, the second inductance and the 3rd inductance, the first inductance,
One end of two inductance and the 3rd inductance bridge arm with three brachium pontis respectively is connected, the first inductance, the second inductance
It is connected in the low-pressure side triple line of rectifier transformer with the other end of the 3rd inductance.
Three level subway energy feedbacks the most according to claim 1 and harmonic wave control integrated apparatus,
It is characterized in that: described control system includes controller, PWM generator and the driving module being sequentially connected,
And all with A/D sampling module and the I/O circuit of controller both-way communication；
Described A/D sampling module, for gathering data and the data of collection being transferred to controller；Wherein,
Gather data include the voltage of direct current contact net, the electric current of AC network low-pressure side and harmonic current and
The AC signal of integration power inverter；
Described controller, for receiving the data of collection and carry out data process, it is thus achieved that subway real-time working condition and
Output real-time control signal；Wherein, subway real-time working condition includes on-position, transports without the normal of harmonic current
Row state and the normal operating condition that there is harmonic current, real-time control signal includes energy feedback signal, treats
Machine halt signal and harmonic wave control signal；
Described PWM generator, for generating corresponding PWM according to the real-time control signal of controller output
Modulating wave；
Described driving module is as the drive end of control system, for amplifying the PWM that PWM generator generates
Modulating wave, and the PWM ripple of amplification is transferred to the control end of integration power inverter to drive one
Body power inverter puts into operation；
Described I/O circuit includes input circuit and output circuit, and input circuit is used for receiving input signal and inciting somebody to action
The high level of input signal is converted to low level input controller, and output circuit receives the control signal of controller
And the voltage signal that the low transition of control signal is normal work is exported.
Three level subway energy feedbacks the most according to claim 6 and harmonic wave control integrated apparatus,
It is characterized in that: described control system also includes the communication module being connected with controller, described communication module is used
Communicate in controller is set up with host computer；
Described controller includes the DSP master controller using dsp chip and uses the FPGA of fpga chip
Pilot controller, described DSP master controller and FPGA pilot controller be sequentially connected and respectively with A/D
Sampling module is connected；
Described DSP master controller processes for data and then judges subway real-time working condition and selects control signal；
Described FPGA pilot controller is for logical process and then generates PWM waveform.
8. three level subway energy feedbacks and a control method for harmonic wave control integrated apparatus, its feature
It is, comprises the following steps:
1) trigger voltage of default direct current contact net, real by the A/D sampling module in control system
Time detection direct current contact net voltage, the controller in control system by gather direct current contact net voltage and system
The trigger voltage set compares, and judges that whether direct current contact net voltage is more than trigger voltage；
The most then judge that subway real-time working condition is on-position, then perform step 2)；
If it is not, then perform step 3)；
2) controller starts energy feedback algorithm, generates energy feedback modulating wave, through PWM generator and
Driving module output energy feedback signal, energy feedback signal sends into integration power inverter with energy feedback
Pattern puts into operation, and integration power inverter feeds back to subway after the braking energy accessed is carried out inversion and supplies
The AC network of electrical network；
3) the electric current adverse current of direct current contact net being detected in real time when A/D sampling module, controller judges subway
Real-time working condition is normal operating condition；
Detected the electric current of AC network low-pressure side in real time by A/D sampling module, controller judges harmonic current
Whether exceed standard；
The most then perform step 4)；
If it is not, then controller block at once pwm pulse output so that integration power inverter suspend into
Enter standby mode；
4) controller starts harmonic compensation algorithm, generates harmonic component modulating wave, through PWM generator and
Driving module to export actual compensating control signal, integration power inverter puts into operation, produces Contrary compensation
The AC network of distortion is compensated as sine wave by electric current with counteracting harmonic current.
Three level subway energy feedbacks the most according to claim 8 and harmonic wave control integrated apparatus
Control method, it is characterised in that: described step 3) in controller judge whether harmonic current exceeds standard, tool
Body is,
The three-phase current of AC network low-pressure side 3-1) collected is respectively ia、ibAnd ic, sit through abc/dq
Mark conversion, obtains watt current i of AC network low-pressure sidedWith reactive current iq；
3-2) watt current idWith reactive current iqBy leaving DC component after low pass filter, then through sitting
Mark inverse transformation obtains three-phase fundamental current and is respectively iaf、ibfAnd icf；
3-3) three-phase current of the AC network low-pressure side collected is individually subtracted calculated three-phase base
Ripple electric current, obtaining three-phase current harmonic component is iha、ihbAnd ihc；
3-4) when three-phase current harmonic component iha、ihbAnd ihcDuring more than zero, then judge to there is harmonic current,
Contrast first-harmonic value simultaneously, it may be determined that current distortion degree；
When three-phase current harmonic component iha、ihbAnd ihcDuring equal to zero, then judge without harmonic current.
Three level subway energy feedbacks the most according to claim 9 and harmonic wave control integrated apparatus
Control method, it is characterised in that: described step 4) specifically,
4-1) by watt current i of AC network low-pressure sidedWith meritorious reference current Id *Carry out PI regulation, will
The reactive power electric current i of AC network low-pressure sideqWith idle reference current Iq *Carry out PI regulation, then pass through
With three-phase current harmonic component i after dq/abc conversionha、ihbAnd ihcIt is calculated the modulation of PWM modulation signal
Ripple；
4-2) controller calculates according to the modulating wave of PWM modulation signal and generates PWM waveform, through PWM
Generator and driving module export actual compensating control signal, and actual compensating control signal exports three level electricity
The IGBT pipe of die mould inverter, utilizes the shutoff of opening of each brachium pontis IGBT pipe to produce and harmonic current size
Contrary compensation electric current i equal, in opposite directions, it is used for offsetting harmonic current, the AC network of distortion is mended
Repay as sine wave.
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