CN110212545A - Static reactive generator - Google Patents
Static reactive generator Download PDFInfo
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- CN110212545A CN110212545A CN201810166929.XA CN201810166929A CN110212545A CN 110212545 A CN110212545 A CN 110212545A CN 201810166929 A CN201810166929 A CN 201810166929A CN 110212545 A CN110212545 A CN 110212545A
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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
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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
-
- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention provides a kind of static reactive generator, comprising: master control borad and at least one inverter module, the output electric current of the detection of at least one inverter module load current and the static reactive generator；The master control borad is according to the load current and the output electric current, determine the DC component of the load current and the DC component of the output electric current, the drive pulse signal for controlling at least one inverter module is generated according to the AC compounent of the DC component of the load current, the DC component of the output electric current and the output electric current, so that the electric current of at least one described inverter module output and the load current opposite in phase.Static reactive generator of the invention can carry out the compensation of reactive power, the three-phase imbalance of load current and low-order harmonic electric current simultaneously, can also reduce the Breakdown Maintenance time, improve availability.
Description
Technical field
All things considered of the present invention is related to technical field of wind power, more particularly, is related to a kind of static reactive generator.
Background technique
AC energy is by that since electric load is not purely resistive load, can lead in practical electric load consumption process
It causes load and power grid end to generate reactive power exchange, reduces power grid available capacity；On the other hand, as load side blower, water pump etc. are non-
Linear load increases, and mains by harmonics harm is increasingly serious.With the development of power electronics technology, in low-voltage network usually
Use static reactive generator (static var generator, SVG) Lai Jinhang electric network reactive compensation and harmonic compensation.Tradition
Powerful static reactive generator generally include high-power insulated gate bipolar transistor (IGBT), the capacitor of discrete component
And busbar.
Currently, entire static reacance occurs when some power device inside static reactive generator breaks down
Device is with regard to out of service；Also, existing static reactive generator volume is larger, in Breakdown Maintenance, needs to remove many zero
Part, connection busbar and cable just can be carried out maintenance, take time and effort, extremely inconvenient.In addition, traditional large capacity static reacance occurs
Device is substantially an a kind of specification of capacity, and applicability is poor.
Summary of the invention
The purpose of the present invention is to provide a kind of static reactive generators, can carry out reactive power, load current simultaneously
Three-phase imbalance and low-order harmonic electric current compensation, the Breakdown Maintenance time can also be reduced, improve availability.
The present invention provides a kind of static reactive generator, comprising: master control borad and at least one inverter module, wherein institute
State the output electric current of at least one inverter module detection load current and the static reactive generator；The master control borad according to
The load current and the output electric current determine the DC component of the load current and the direct current point of the output electric current
Amount, according to the DC component of the load current, the AC compounent of the DC component of the output electric current and the output electric current
The drive pulse signal for controlling at least one inverter module is generated, so that at least one described inverter module is defeated
Out with the electric current of the load current opposite in phase.
Optionally, the static reactive generator further include: alternating current bus bar, wherein at least one described inverter module
Including multiple inverter modules being connected in parallel, it is female that the exchange side of each inverter module is parallel-connected to the exchange respectively
Row, wherein any one inverter module in multiple inverter modules detects the load current and the output electric current, and
And the sum of output electric current of multiple inverter modules is the electric current with the load current opposite in phase.
Optionally, when inverter module breaks down, non-faulty inverter module generates fault-signal, the master control borad base
In the fault-signal disabling faulty inverter module.
Optionally, the master control borad is configured as: DC component and the output electric current based on the load current
DC component executes the processing of the first proportional integration, and the result based on the processing of first proportional integration and the output electric current
AC compounent executes Repetitive controller processing, to obtain the modulating wave of the fundamental wave for generating PWM waveform；Based on the load
The DC component of the DC component of electric current and the output electric current, executes the processing of the second proportional integration, and be based on the second ratio
Integral Processing is handled as a result, executing ratio control, to obtain the modulating wave of the harmonic wave for generating PWM waveform；Based on use
In the modulating wave for the fundamental wave for generating PWM waveform and the modulating wave of the harmonic wave for generating PWM waveform, generate for control it is described extremely
The drive pulse signal of a few inverter module.
Optionally, the master control borad is configured as: determining DC component, the load current of load current positive sequence reactive component
The DC component of negative sequence active component, the DC component of load current negative phase-sequence reactive component and the direct current point for loading zero-sequence current
Amount；Determine the DC component of the individual harmonic current of the load current；Determine the direct current point of output electric current positive sequence reactive component
Amount, the DC component of output electric current negative sequence active component, the DC component for exporting electric current negative phase-sequence reactive component and output zero sequence electricity
The DC component of stream；Determine the DC component of the individual harmonic current of the output electric current；According to the load current positive sequence without
The direct current point of the DC component of function component, the DC component of load current negative sequence active component, load current negative phase-sequence reactive component
DC component, the output electric current of the DC component and the output electric current positive sequence reactive component of amount and load zero-sequence current
The DC component of negative sequence active component, the DC component of the output electric current negative phase-sequence reactive component, the output zero-sequence current
The AC compounent of DC component and the output electric current, obtains the modulating wave of the fundamental wave for generating PWM waveform；According to described
The DC component of the individual harmonic current of the DC component of the individual harmonic current of load current and the output electric current, is used
In the modulating wave for the harmonic wave for generating PWM waveform；By the modulating wave for being used to generate the fundamental wave of PWM waveform and it is used to generate PWM waveform
The modulating wave of harmonic wave be added, obtain total modulating wave for generating PWM waveform, with generate for control it is described at least one
The drive pulse signal of inverter module.
Optionally, the master control borad is also configured to each phase using load current described in rotating coordinate transformation factor pair
AC compounent carries out rotating coordinate transformation, obtains the load current positive sequence reactive component, active point of the load current negative phase-sequence
Amount and the load current negative phase-sequence reactive component；The three-phase average value of the load current is determined as the load zero sequence electricity
Stream；By to the load current positive sequence reactive component, the load current negative sequence active component, the load current negative phase-sequence without
Function component carries out moving average filter and obtains the DC component of the load current positive sequence reactive component, the load current negative phase-sequence
The DC component of the DC component of active component, the load current negative phase-sequence reactive component；By the load zero-sequence current and institute
Rotating coordinate transformation fac-tor is stated, moving average filter is carried out to the result of multiplication, and the result of moving average filter is multiplied
With 2, the DC component of the load zero-sequence current is obtained.
Optionally, the master control borad is also configured to respectively revolve each phase AC compounent of the load current with odd times
Turn coordinate transform fac-tor, moving average filter is carried out and by the result of moving average filter multiplied by 2 to the result of multiplication, is obtained
To the DC component of the individual harmonic current of the load current.
Optionally, the master control borad is also configured to utilize each phase for exporting electric current described in rotating coordinate transformation factor pair
AC compounent carries out rotating coordinate transformation, obtains the output electric current positive sequence reactive component, active point of output electric current negative phase-sequence described
Amount and the output electric current negative phase-sequence reactive component；The three-phase average value of the output electric current is determined as the output zero sequence electricity
Stream；By to the output electric current positive sequence reactive component, the output electric current negative sequence active component, the output electric current negative phase-sequence without
Function component carries out moving average filter and obtains DC component, the output electric current negative phase-sequence of the output electric current positive sequence reactive component
The DC component of the DC component of active component and the output electric current negative phase-sequence reactive component；By the output zero-sequence current and institute
Rotating coordinate transformation fac-tor is stated, moving average filter carried out to the result of multiplication, and by the result of moving average filter
Multiplied by 2, the DC component of the output zero-sequence current is obtained.
Optionally, the master control borad is also configured to respectively revolve each phase AC compounent of the output electric current with odd times
Turn coordinate transform fac-tor, moving average filter carried out to the result of multiplication, and by the result of moving average filter multiplied by 2,
Obtain the DC component of the individual harmonic current of the output electric current.
Optionally, the master control borad is also configured to the DC component to the load current positive sequence reactive component, described
The DC component of load current negative sequence active component, the DC component of the load current negative phase-sequence reactive component and the load zero
The DC component of sequence electric current carries out priority selection and amplitude limiting processing, the positive sequence reactive component for obtaining the load current is given,
The negative phase-sequence reactive component of given, the described load current of the negative sequence active component of the load current is given, the load zero sequence is electric
The DC component of stream is given,；By the negative sequence active component of given, the described load current of the positive sequence reactive component of the load current
The DC component of given, the described load zero-sequence current of the negative phase-sequence reactive component of given, the described load current it is given respectively with it is described
Export the DC component of electric current positive sequence reactive component, the DC component of the output electric current negative sequence active component, output electricity
The DC component of the DC component, the output zero-sequence current that flow negative phase-sequence reactive component is subtracted each other, and executes third to the result subtracted each other
Proportional integration processing, and positive sequence inverse transformation, negative phase-sequence inverse transformation, zero sequence inverse transformation are carried out to the result of third proportional integration processing；
The result that result, zero sequence inverse transformation that result that positive sequence inverse transformation obtains, negative phase-sequence inverse transformation obtain obtain is separately summed, is obtained
The instantaneous value of three-phase fundamental current is given；The instantaneous value of the three-phase fundamental current is given each with the output electric current respectively
Phase AC compounent is subtracted each other, and Repetitive controller processing is executed to the result subtracted each other, to obtain the base wave modulation for generating PWM waveform
Wave.
Optionally, the master control borad is also configured to the DC component warp to the individual harmonic current of the load current
Harmonic wave selection and amplitude limiting processing are crossed, the individual harmonic current for obtaining the load current is given；By each time of the load current
The given DC component respectively with the individual harmonic current of the output electric current of harmonic current is subtracted each other, and executes the to the result subtracted each other
The processing of four proportional integrations will be multiplied by the result of the 4th proportional integration processing respectively with odd times rotating coordinate transformation fac-tor
Results added, the of ac for obtaining individual harmonic current is given；By the of ac of the individual harmonic current it is given respectively with
Impedance factor is multiplied, and the result of multiplication is separately summed, and obtains the modulating wave of the harmonic wave for generating PWM waveform.
Optionally, each inverter module at least one described inverter module includes: inversion control plate and multiple groups
Power device, wherein the multiple power devices are connected to the alternating current bus bar, and the inversion control plate detects the load electricity
Stream, the output electric current and the fault-signal, and the load current, the output electric current and the fault-signal are sent
To master control borad.
Static reactive generator of the invention can carry out reactive power, the three-phase imbalance of load current and low simultaneously
The compensation of subharmonic current, especially by the direct current of the output electric current of DC component and static reactive generator to load current
Component executes the processing of the first proportional integration, and result and the output electric current based on the processing of the first proportional integration exchange point
Amount executes Repetitive controller processing, to carry out fundamental wave control；Also by the DC component of load current and the output electric current
DC component executes the processing of the second proportional integration, and the result based on the processing of the second proportional integration executes ratio control processing,
To carry out harmonic controling.In addition, the static reactive generator can also reduce the Breakdown Maintenance time, availability is improved, especially
It is suitable for three-phase four-wire systems.
Detailed description of the invention
By the detailed description carried out below in conjunction with the accompanying drawings, above and other objects of the present invention, features and advantages will
It becomes more fully apparent, in which:
Fig. 1 shows the schematic diagram of the static reactive generator of embodiment according to the present invention；
Fig. 2 shows the schematic diagrames of the inverter module of embodiment according to the present invention；
The master control borad that Fig. 3 shows embodiment according to the present invention determines the idle and uneven DC component of load current
Schematic diagram；
The master control borad that Fig. 4 shows embodiment according to the present invention determines the schematic diagram of the harmonic wave DC component of load current；
The master control borad that Fig. 5 shows embodiment according to the present invention determine static reactive generator output electric current idle and
The schematic diagram of uneven DC component；
The master control borad that Fig. 6 shows embodiment according to the present invention determines that the harmonic wave of the output electric current of static reactive generator is straight
The schematic diagram of flow component；
The master control borad that Fig. 7 shows embodiment according to the present invention determines the schematic diagram of fundamental modulation wave；
The master control borad that Fig. 8 shows embodiment according to the present invention determines the schematic diagram of Harmonic Modulated Wave；
Fig. 9 shows output when the single-phase unbalanced load of compensation of the static reactive generator of embodiment according to the present invention
Practical measurement of current waveform diagram.
Specific embodiment
Now, different example embodiments is more fully described with reference to the accompanying drawings, wherein some exemplary embodiments are attached
It is shown in figure.
The static reactive generator of embodiment according to the present invention is described referring to Fig. 1 to Fig. 9.
Fig. 1 shows the schematic diagram of the static reactive generator of embodiment according to the present invention.
Referring to Fig.1, the static reactive generator of embodiment according to the present invention includes: master control borad 100 and at least one is inverse
Become device module 200.
Here, the output electric current of the detection of at least one inverter module 200 load current and static reactive generator.
Master control borad 100 determines the direct current of the load current according to the output electric current of load current and static reactive generator
The DC component of component and the output electric current according to the DC component of the load current, the DC component of the output electric current and is somebody's turn to do
The AC compounent of output electric current generates the drive pulse signal for controlling at least one inverter module 200, so that at least one
The electric current of a inverter module 200 output and the load current opposite in phase.
Preferably, at least one inverter module 200 is connected to master control borad 100 by fiber optic network.Inverter module 200
The output electric current of load current and static reactive generator is sent to master control borad 100.
Here, at least one inverter module 200 includes multiple inverter modules 200 being connected in parallel.
In one example, due to being limited by microprocessor arithmetic speed, 8 inverter modules 200 be could support up simultaneously
Connection connection.Specifically, it is connect by the optical fiber that 8 road optical fiber interfaces on master control borad 100 are connected respectively to each inverter module 200
Mouthful Parallel Control is carried out, by the way that control can make 8 tunnels for controlling the drive of inverter module 200 accordingly on master control borad 100
Moving pulse signal is synchronous, to reduce the circulation between inverter module 200.
Further, when any one inverter module 200 breaks down, the inverter module 200 of failure generates event
Hinder signal, master control borad 100 deactivates the inverter module 200 of the failure based on the fault-signal (that is, the inverter mould of excision failure
Block), other inverter modules not broken down can continue to operate normally, to realize Redundant Control, effectively increase and be
The redundancy of system is reduced and is lost caused by failure.
It is in parallel in application, idle, the uneven and harmonic current of compensation can freely divide in multiple inverter modules 200
Match.As an example it is supposed that the quantity of inverter module is 3, then first inverter module can compensating reactive power, second
Inverter module can only compensate it is uneven, third inverter module can compensation harmonic or other independent assortments,
Significantly increase the flexibility of system；When some inverter module incision (enabling) or excision (deactivated), in inverter module
When in the current range of permission, the electric current that the inverter module of excision distributes can be distributed to the inverter of other normal uses
Module.
Preferably, inverter module 200 is the inverter module of two level of three-phase, and the weight of inverter module 200 is less than
30kg.The volume and weight of inverter module 200 is small, and wiring is not only simple but also flexible, when carrying out Breakdown Maintenance, only needs to change
The inverter module of failure, installation and attended operation are more convenient, significantly reduce maintenance time, increase static reacance
The availability of generator.
In addition, static reactive generator further includes alternating current bus bar 300.
Here, the exchange side of each inverter module 200 is parallel-connected to alternating current bus bar 300 respectively.
Specifically, any one inverter module 200 detection load current and static reacance in multiple inverter modules
The output electric current of generator, and the sum of output electric current of multiple inverter modules 200 is and the load current opposite in phase
Electric current.
Here, when static reactive generator needs to extend capacity, it is only necessary to by the exchange side of multiple inverter modules 200
Directly it is parallel-connected on alternating current bus bar.
It should be appreciated that since the DC side of static reactive generator does not need to connect load, so DC master row (not shown)
It not pick out, it is hanging.
Carry out the inverter module of detailed description of the present invention embodiment below with reference to Fig. 2.
Fig. 2 shows the schematic diagrames of the inverter module of embodiment according to the present invention.
Referring to Fig. 2, the inverter module 200 of embodiment according to the present invention includes: inversion control plate 201 and multiple groups power
Device 202.
Here, multiple power devices 202 are connected to alternating current bus bar 300.
Preferably, multiple power devices 202 include four groups of power devices.Here, multiple power devices 202 form one two
The inverter topology of level four bridge legs can be used to compensate the out-of-balance current and harmonic wave in three-phase four-wire system.
Preferably, every group of power device 202 includes driving plate 203 and IGBT unit 204.
Inversion control plate 201 detects load current, the output electric current of static reactive generator and static reactive generator
Fault-signal, and the load current, the output electric current and the fault-signal are sent to by master control borad 100 by optical-fibre communications.Together
When, inversion control plate 201 receives the driving digital pulse signal that master control borad 100 is sent by optical-fibre communications, to complete inversion
The inversion control of device module.
In addition, inverter module 200 further includes heat-pipe radiator (not shown), film support capacitor 205, the suction of IGBT high frequency
Receive the cooling fan (not shown) of capacitor (not shown) and 24V control.
Idle, electric current is carried out below with reference to the static reactive generator that Fig. 3 to Fig. 9 carrys out detailed description of the present invention embodiment
Uneven, harmonic compensation process.
Specifically, master control borad 100 is configured as: DC component based on the load current and the output electric current it is straight
Flow component executes the processing of the first proportional integration, and the friendship of the result based on the processing of the first proportional integration and the output electric current
Flow component executes Repetitive controller (repetitive control, RC) processing, to obtain the fundamental wave for generating PWM waveform
Modulating wave；The DC component of DC component and the output electric current based on the load current, executes the second proportional integration
Processing, and handling as a result, executing ratio control based on the processing of the second proportional integration, to obtain for generating PWM waveform
Harmonic wave modulating wave；Modulating wave based on the fundamental wave for generating PWM waveform and the humorous wave modulation for generating PWM waveform
Wave generates the drive pulse signal for controlling at least one inverter module.
The master control borad that Fig. 3 shows embodiment according to the present invention determines the idle and uneven DC component of load current
Schematic diagram.
Referring to Fig. 3, master control borad 100 is configured as: being determined the DC component L_ILqP of load current positive sequence reactive component, is born
Carry the DC component L_ILdN of electric current negative sequence active component, the DC component L_ILqN of load current negative phase-sequence reactive component and load
DC component L_IL0X, L_IL0Y of zero-sequence current iL0.
Specifically, master control borad 100 is configured as: utilizing each intersection flow point of the rotating coordinate transformation factor pair load current
It measures iLa, iLb, iLc and carries out rotating coordinate transformation, obtain load current positive sequence reactive component iLqp, the load current negative phase-sequence has
Function component iLdn and load current negative phase-sequence reactive component iLqn；The three-phase average value of the load current is determined as the load
Zero-sequence current iL0；By to load current positive sequence reactive component iLqp, load current negative sequence active component iLdn, this is negative
It is negative that load electric current negative phase-sequence reactive component iLqn progress moving average filter (moving average filtering, MAF) obtains this
It carries the DC component L_ILqP of electric current positive sequence reactive component, the DC component L_ILdN of the load current negative sequence active component, be somebody's turn to do
The DC component L_ILqN of load current negative phase-sequence reactive component；By the load zero-sequence current iL0 and rotating coordinate transformation factor phase
Multiply, moving average filter is carried out to the result of multiplication, and by the result of moving average filter multiplied by 2, obtains the load zero sequence electricity
Flow DC component L_IL0X, L_IL0Y of iL0.
Here, the rotating coordinate transformation factor is network voltage Ua, Ub, Uc warp of any one inverter module 200 detection
Cross the cosine of the sine value sin (wt) of the phase for the network voltage that phase-locked loop pll obtains and the phase of the network voltage
Value cos (wt).
The master control borad that Fig. 4 shows embodiment according to the present invention determines the schematic diagram of the harmonic wave DC component of load current.
Referring to Fig. 4, master control borad 100 is configured as: determining the DC component L_ of the individual harmonic current of the load current
ILakX、L_ILakY、L_ILbkX、L_ILbkY、L_ILckX、L_ILckY。
Specifically, master control borad 100 is configured as: by each phase AC compounent iLa, iLb, iLc of load current respectively with surprise
Secondary rotating coordinate transformation fac-tor, to the result of multiplication carry out moving average filter and by the result of moving average filter multiplied by
2, obtain DC component L_ILakX, L_ILakY, L_ILbkX, L_ILbkY, L_ of the individual harmonic current of the load current
ILckX、L_ILckY。
Here, the odd times rotating coordinate transformation factor is the sine value sin (kwt) and odd times times of the phase of odd times times
The cosine value cos (kwt) (k=3,5,7,11,13) of the phase.
The master control borad that Fig. 5 shows embodiment according to the present invention determine static reactive generator output electric current idle and
The schematic diagram of uneven DC component.
Referring to Fig. 5, master control borad 100 is configured as: determining the output electric current positive sequence reactive component of static reactive generator
DC component L_IFqP, the DC component L_IFdN for exporting electric current negative sequence active component, the straight of electric current negative phase-sequence reactive component is exported
DC component L_IF0X, L_IF0Y of flow component L_IFqN and output zero-sequence current iF0.
Specifically, master control borad 100 is configured as: utilizing each intersection flow point of the rotating coordinate transformation factor pair output electric current
It measures iFa, iFb, iFc and carries out rotating coordinate transformation, obtain output electric current positive sequence reactive component iFqp, the output electric current negative phase-sequence has
Function component iFdn and output electric current negative phase-sequence reactive component iFqn；The three-phase average value of the output electric current is determined as the output zero
Sequence electric current iF0；By to output electric current positive sequence reactive component iFqp, output electric current negative sequence active component iFdn, the output
Electric current negative phase-sequence reactive component iFqn carries out moving average filter and obtains the DC component L_ of the output electric current positive sequence reactive component
The DC component of IFqP, the DC component L_IFdN of the output electric current negative sequence active component and the output electric current negative phase-sequence reactive component
L_IFqN；By the output zero-sequence current iF0 and rotating coordinate transformation fac-tor, moving average filter is carried out to the result of multiplication
Device, and by the result of moving average filter multiplied by 2, obtain DC component L_IF0X, L_IF0Y of output zero-sequence current iF0.
The master control borad that Fig. 6 shows embodiment according to the present invention determines that the harmonic wave of the output electric current of static reactive generator is straight
The schematic diagram of flow component.
Referring to Fig. 6, master control borad 100 is configured as: determining the individual harmonic current of the output electric current of static reactive generator
DC component L_IFakX, L_IFakY, L_IFbkX, L_IFbkY, L_IFckX, L_IFckY.
Specifically, master control borad 100 is configured as: by each phase AC compounent iFa, iFb, iFc of the output electric current respectively with
Odd times rotating coordinate transformation fac-tor carries out moving average filter to the result of multiplication, and by the result of moving average filter
Multiplied by 2, obtain DC component L_IFakX, L_IFakY of the individual harmonic current of the output electric current, L_IFbkX, L_IFbkY,
L_IFckX、L_IFckY。
The master control borad that Fig. 7 shows embodiment according to the present invention determines that nothing is also shown in the schematic diagram of fundamental modulation wave, Fig. 7
Function and out-of-balance current ring control principle block diagram.
Referring to Fig. 7, master control borad 100 is configured as: according to the DC component L_ILqP of load current positive sequence reactive component, being born
Carry the DC component L_ILdN of electric current negative sequence active component, the DC component L_ILqN of load current negative phase-sequence reactive component and load
The output electric current positive sequence reactive component of DC component L_IL0X, L_IL0Y and static reactive generator of zero-sequence current iL0
DC component L_IFdN, the static reacance of the output electric current negative sequence active component of DC component L_IFqP, static reactive generator
The output zero-sequence current iF0 of the output DC component L_IFqN of electric current negative phase-sequence reactive component of generator, static reactive generator
DC component L_IF0X, L_IF0Y and static reactive generator output electric current AC compounent, obtain for generating PWM
Modulating wave Pwm_IFaout, Pwm_IFbout, Pwm_IFcout of the fundamental wave of waveform.
Specifically, master control borad 100 is configured as: DC component L_ILqP, load to load current positive sequence reactive component
The DC component L_ILdN of electric current negative sequence active component, the DC component L_ILqN of load current negative phase-sequence reactive component and load zero
(priority selection can choose nothing for DC component L_IL0X, the L_IL0Y progress priority selection of sequence electric current iL0 and amplitude limiting processing
Function is preferential, or uneven preferential, or compensates simultaneously, and amplitude limit link is to limit total compensation current effective value no more than module
The maximum current of permission), the positive sequence reactive component for obtaining the load current gives IqRef, active point of negative phase-sequence of the load current
Measure given IdNRef, the negative phase-sequence reactive component of the load current gives IqNRef, the DC component of the load zero-sequence current is given
I0XRef,I0Yref；The positive sequence reactive component of the load current is given into IqRef, the negative sequence active component of the load current is given
Determine IdNRef, the negative phase-sequence reactive component of the load current gives IqNRef, the DC component of the load zero-sequence current is given
I0XRef, I0Yref are active with the DC component L_IFqP of the output electric current positive sequence reactive component, the output electric current negative phase-sequence respectively
The DC component L_IFdN of component, the DC component L_IFqN of the output electric current negative phase-sequence reactive component, output zero-sequence current iF0
DC component L_IF0X, L_IF0Y subtract each other, third proportional integration (PI) processing is executed to the result subtracted each other, and to third ratio
The result of Integral Processing carries out positive sequence inverse transformation, negative phase-sequence inverse transformation, zero sequence inverse transformation；It is result that positive sequence inverse transformation is obtained, negative
The result that result that sequence inverse transformation obtains, zero sequence inverse transformation obtain is separately summed, and the instantaneous value for obtaining three-phase fundamental current is given
iaRef,ibRef,icRef；It is electric with the output respectively that the instantaneous value of the three-phase fundamental current is given into iaRef, ibRef, icRef
Each phase AC compounent iFa, iFb, iFc of stream subtract each other, and Repetitive controller processing are executed to the result subtracted each other, to obtain for generating
Modulating wave Pwm_IFaout, Pwm_IFbout, Pwm_IFcout of the fundamental wave of PWM waveform.
In the present embodiment, harmonic wave and the stable state mistake for eliminating electric current that Repetitive controller can inhibit actual output current to generate
Difference can correct current output according to the deviation of history.The present embodiment uses advanced 4 methods clapped, according to upper one
The deviation of grid cycle electric current shifts to an earlier date 4 bats and is corrected to deviation, effectively reduces the dead zone in IGBT driving pulse and power grid electricity
Influence of the harmonic wave to output current harmonics is pressed, and substantially eliminates the steady-state error of current tracking.
Here, master control borad 100 is configured as: the positive sequence reactive component of the load current is given IqRef and output electricity
The DC component L_IFqP of stream positive sequence reactive component subtracts each other, and executes the processing of third proportional integration to the result subtracted each other, and to third
The result of proportional integration processing carries out positive sequence inverse transformation and obtains ipRefa, ipRefb, ipRefc；The negative phase-sequence of the load current is had
Function component gives the IdNRef and DC component L_IFdN of the output electric current negative sequence active component and subtracts each other, and executes to the result subtracted each other
Third proportional integration handles to obtain the first result；The negative phase-sequence reactive component of the load current is given into IqNRef and output electricity again
The DC component L_IFqN of stream negative phase-sequence reactive component subtracts each other, and executes third proportional integration to the result subtracted each other and handles to obtain the second knot
Then fruit carries out negative phase-sequence inverse transformation to the first result and the second result and obtains inRefa, inRefb, inRefc；By the load zero
The DC component of sequence electric current gives I0XRef, I0Yref DC component L_IF0X, L_ with output zero-sequence current iF0 respectively
IF0Y subtracts each other, and executes the processing of third proportional integration to two results subtracted each other, and carry out to the result of third proportional integration processing
Zero sequence inverse transformation obtains i0Ref；Then the result obtained result ipRefa that positive sequence inverse transformation obtains, negative phase-sequence inverse transformation
The instantaneous value that inRefa is added to obtain with the result i0Ref that zero sequence inverse transformation obtains three-phase fundamental current gives iaRef, by positive sequence
The result i0Ref that the result inRefb and zero sequence inverse transformation that result ipRefb that inverse transformation obtains, negative phase-sequence inverse transformation obtain are obtained
It is added and obtains the instantaneous value given ibRef, the result ipRefc that positive sequence inverse transformation is obtained, negative phase-sequence inverse transformation of three-phase fundamental current
The instantaneous value that obtained result inRefc is added to obtain with the result i0Ref that zero sequence inverse transformation obtains three-phase fundamental current is given
icRef。
The master control borad that Fig. 8 shows embodiment according to the present invention determines the schematic diagram of Harmonic Modulated Wave, and harmonic wave is also shown
Current loop control functional block diagram.
Referring to Fig. 8, master control borad 100 is configured as: according to the DC component L_ of the individual harmonic current of load current
Each time of the output electric current of ILakX, L_ILakY, L_ILbkX, L_ILbkY, L_ILckX, L_ILckY and static reactive generator
DC component L_IFakX, L_IFakY, L_IFbkX, L_IFbkY, L_IFckX, L_IFckY of harmonic current, obtain for producing
Modulating wave Pwm_IHaout, Pwm_IHbout, Pwm_IHcout of the harmonic wave of raw PWM waveform.
Specifically, master control borad 100 is configured as: to DC component L_ILakX, L_ of the individual harmonic current of load current
ILakY, L_ILbkX, L_ILbkY, L_ILckX, L_ILckY are selected by harmonic wave and amplitude limiting processing, obtains the load current
Individual harmonic current gives IakXRef, IakYRef, IbkXRef, IbkYRef, IckXRef, IckYRef；By the load current
Individual harmonic current give IakXRef, IakYRef, IbkXRef, IbkYRef, IckXRef, IckYRef respectively with the output
DC component L_IFakX, L_IFakY, L_IFbkX, L_IFbkY, L_IFckX, L_IFckY (k of the individual harmonic current of electric current
=3,5,7,11,13) subtract each other, the processing of the 4th proportional integration is executed to the result subtracted each other, by the result of the 4th proportional integration processing
It is multiplied respectively with odd times rotating coordinate transformation factor sin (kwt), cos (kwt), by the results added of multiplication, obtains each harmonic
The of ac of electric current gives ihaRef, ihbRef, ihcRef；By the of ac of individual harmonic current give ihaRef, ihbRef,
IhcRef is multiplied with impedance factor Ck respectively, and the result of multiplication is separately summed, and obtains the harmonic wave for generating PWM waveform
Modulating wave Pwm_IHaout, Pwm_IHbout, Pwm_IHcout.
Here, each harmonic corresponds to different impedance factor Ck.
In addition, master control borad 100 be also configured to be used to generate the modulating wave Pwm_IFaout of the fundamental wave of PWM waveform,
Pwm_IFbout, Pwm_IFcout and modulating wave Pwm_IHaout, Pwm_IHbout of the harmonic wave for generating PWM waveform,
Pwm_IHcout is added, and obtains total modulating wave for generating PWM waveform, to generate for controlling at least one described inversion
The drive pulse signal of device module.
Fig. 9 shows output when the single-phase unbalanced load of compensation of the static reactive generator of embodiment according to the present invention
Practical measurement of current waveform diagram.
Referring to Fig. 9, A, B, C, N respectively represent each phase current of static reactive generator output, as shown in Figure 9, only A phase
The 180A out-of-balance current of output single-phase between N phase, to compensate the out-of-balance current of load, to ensure that power network current
Balance, effectively demonstrates the superiority of three-phase four-arm topological structure of the invention.
Since internal control is idle, uneven and harmonic wave electric current is controlled using pi regulator, pi regulator can only
DAZ gene is carried out to DC quantity, so needing to convert DC quantity for idle, the uneven and harmonic component of load current
To be controlled.The embodiment of the present invention is all made of moving average filter to idle, uneven and harmonic current detection
(MAF) method detection, moving average filter implementation method is that N number of sampled value is continuously taken to regard a round-robin queue, queue as
Length is fixed as N, samples a new data every time and is put into tail of the queue, and throws away a data (the first in first out original of original head of the queue
Then), the arithmetic mean of instantaneous value of the data that filter exports every time always N number of data in current queue.In this way every time only
It needs to calculate current sampling point, calculation amount is small.Only monophase current is converted when harmonic controling, more suitable for three-phase
Control of the four-wire system static reactive generator to single-phase harmonic current, so the simpler spirit in harmonic wave selection and clipping function
It is living.
In addition, the static reactive generator of the embodiment of the present invention, can carry out simultaneously reactive power, load current three
Mutually uneven and low-order harmonic electric current compensation, especially by load current DC component and static reactive generator it is defeated
The DC component of electric current executes the processing of the first proportional integration, and the result based on the processing of the first proportional integration and output electricity out
The AC compounent of stream executes Repetitive controller processing, to carry out fundamental wave control；Also by DC component to load current and should
The DC component for exporting electric current executes the processing of the second proportional integration, and the result based on the processing of the second proportional integration executes ratio
Control processing, to carry out harmonic controling.In addition, the static reactive generator can also reduce the Breakdown Maintenance time, raising can
Utilization rate is particularly suitable for three-phase four-wire system.
Although being particularly shown and describing the present invention, those skilled in the art referring to its exemplary embodiment
It should be understood that in the case where not departing from the spirit and scope of the present invention defined by claim form can be carried out to it
With the various changes in details.
Claims (12)
1. a kind of static reactive generator characterized by comprising master control borad and at least one inverter module,
Wherein, the output electric current of the detection of at least one inverter module load current and the static reactive generator；
The master control borad determines the DC component of the load current and described according to the load current and the output electric current
The DC component for exporting electric current, according to the DC component of the load current, the output DC component of electric current and described defeated
The AC compounent of electric current generates the drive pulse signal for controlling at least one inverter module out so that it is described at least
The electric current of one inverter module output and the load current opposite in phase.
2. static reactive generator as described in claim 1, which is characterized in that the static reactive generator further include: hand over
Busbar is flowed,
Wherein, at least one described inverter module includes multiple inverter modules being connected in parallel,
The exchange side of each inverter module is parallel-connected to the alternating current bus bar respectively,
Wherein, any one inverter module in multiple inverter modules detects the load current and the output electric current,
And the sum of output electric current of multiple inverter modules is the electric current with the load current opposite in phase.
3. static reactive generator as claimed in claim 2, which is characterized in that when inverter module breaks down, failure
Inverter module generates fault-signal, and the master control borad is based on the fault-signal disabling faulty inverter module.
4. static reactive generator as claimed in claim 2, which is characterized in that the master control borad is configured as:
The DC component of DC component and the output electric current based on the load current, executes the processing of the first proportional integration,
And the AC compounent of result and the output electric current based on the processing of the first proportional integration, executes Repetitive controller processing, thus
Obtain the modulating wave of the fundamental wave for generating PWM waveform；
The DC component of DC component and the output electric current based on the load current, executes the processing of the second proportional integration,
And it is based on the processing of the second proportional integration as a result, ratio control processing is executed, to obtain the harmonic wave for generating PWM waveform
Modulating wave；
The modulating wave of modulating wave based on the fundamental wave for generating PWM waveform and the harmonic wave for generating PWM waveform, generation are used for
Control the drive pulse signal of at least one inverter module.
5. static reactive generator as claimed in claim 4, which is characterized in that the master control borad is configured as:
Determine the DC component of load current positive sequence reactive component, the DC component of load current negative sequence active component, load electricity
Flow the DC component of negative phase-sequence reactive component and the DC component of load zero-sequence current；
Determine the DC component of the individual harmonic current of the load current；
The DC component for determining output electric current positive sequence reactive component, the DC component for exporting electric current negative sequence active component, output electricity
Flow the DC component of negative phase-sequence reactive component and the DC component of output zero-sequence current；
Determine the DC component of the individual harmonic current of the output electric current；
According to the DC component of the load current positive sequence reactive component, the DC component of load current negative sequence active component, bear
It carries the DC component of electric current negative phase-sequence reactive component and the DC component of load zero-sequence current and the output electric current positive sequence is idle
The DC component of component, the DC component of the output electric current negative sequence active component, the output electric current negative phase-sequence reactive component
The AC compounent of DC component, the DC component of the output zero-sequence current and the output electric current, obtains for generating PWM
The modulating wave of the fundamental wave of waveform；
According to the straight of the individual harmonic current of the DC component of the individual harmonic current of the load current and the output electric current
Flow component obtains the modulating wave of the harmonic wave for generating PWM waveform；
The modulating wave for being used to generate the fundamental wave of PWM waveform is added with the modulating wave for the harmonic wave for being used to generate PWM waveform, is used
In the total modulating wave for generating PWM waveform, to generate the drive pulse signal for controlling at least one inverter module.
6. static reactive generator as claimed in claim 5, which is characterized in that the master control borad is also configured to
Rotating coordinate transformation is carried out using each phase AC compounent of load current described in rotating coordinate transformation factor pair, is obtained described
Load current positive sequence reactive component, the load current negative sequence active component and the load current negative phase-sequence reactive component；
The three-phase average value of the load current is determined as the load zero-sequence current；
By to the load current positive sequence reactive component, the load current negative sequence active component, the load current negative phase-sequence
It is negative that reactive component progress moving average filter obtains the DC component of the load current positive sequence reactive component, the load current
The DC component of the DC component of sequence active component, the load current negative phase-sequence reactive component；
By the load zero-sequence current and the rotating coordinate transformation fac-tor, sliding average filter is carried out to the result of multiplication
Wave, and the result of moving average filter is obtained into the DC component of the load zero-sequence current multiplied by 2.
7. static reactive generator as claimed in claim 5, which is characterized in that the master control borad is also configured to
By each phase AC compounent of the load current respectively with odd times rotating coordinate transformation fac-tor, to the result of multiplication into
Row moving average filter and by the result of moving average filter multiplied by 2, obtain the straight of the individual harmonic current of the load current
Flow component.
8. static reactive generator as claimed in claim 5, which is characterized in that the master control borad is also configured to
Rotating coordinate transformation is carried out using each phase AC compounent for exporting electric current described in rotating coordinate transformation factor pair, is obtained described
Export electric current positive sequence reactive component, the output electric current negative sequence active component and the output electric current negative phase-sequence reactive component；
The three-phase average value of the output electric current is determined as the output zero-sequence current；
By to the output electric current positive sequence reactive component, the output electric current negative sequence active component, the output electric current negative phase-sequence
It is negative that reactive component progress moving average filter obtains the DC component of the output electric current positive sequence reactive component, the output electric current
The DC component of the DC component of sequence active component and the output electric current negative phase-sequence reactive component；
By the output zero-sequence current and the rotating coordinate transformation fac-tor, moving average filter is carried out to the result of multiplication
Device, and the result of moving average filter is obtained into the DC component of the output zero-sequence current multiplied by 2.
9. static reactive generator as claimed in claim 5, which is characterized in that the master control borad is also configured to
By each phase AC compounent of the output electric current respectively with odd times rotating coordinate transformation fac-tor, to the result of multiplication into
Row moving average filter, and the result of moving average filter is obtained into the straight of the individual harmonic current of the output electric current multiplied by 2
Flow component.
10. static reactive generator as claimed in claim 5, which is characterized in that the master control borad is also configured to
To the DC component of the load current positive sequence reactive component, the DC component of the load current negative sequence active component,
The DC component of the load current negative phase-sequence reactive component and the DC component of the load zero-sequence current carry out priority selection
And amplitude limiting processing, the negative sequence active component for obtaining given, the described load current of positive sequence reactive component of the load current is given,
The DC component of given, the described load zero-sequence current of the negative phase-sequence reactive component of the load current is given；
Given, the described load by the negative sequence active component of given, the described load current of the positive sequence reactive component of the load current
The DC component of given, the described load zero-sequence current of the negative phase-sequence reactive component of electric current it is given respectively with the output electric current positive sequence without
DC component, the output electric current negative phase-sequence reactive component of the DC component of function component, the output electric current negative sequence active component
DC component, the DC component of the output zero-sequence current subtract each other, the processing of third proportional integration is executed to the result subtracted each other, and
Positive sequence inverse transformation, negative phase-sequence inverse transformation, zero sequence inverse transformation are carried out to the result of third proportional integration processing；
The result that result, zero sequence inverse transformation that result that positive sequence inverse transformation obtains, negative phase-sequence inverse transformation obtain obtain is separately summed,
The instantaneous value for obtaining three-phase fundamental current is given；
The given each phase AC compounent respectively with the output electric current of the instantaneous value of the three-phase fundamental current is subtracted each other, to subtracting each other
Result execute Repetitive controller processing, to obtain the modulating wave of the fundamental wave for generating PWM waveform.
11. static reactive generator as claimed in claim 5, which is characterized in that the master control borad is also configured to
Harmonic wave selection and amplitude limiting processing are passed through to the DC component of the individual harmonic current of the load current, obtain the load
The individual harmonic current of electric current is given；
By the given direct current point with the individual harmonic current of the output electric current respectively of the individual harmonic current of the load current
Amount is subtracted each other, and executes the processing of the 4th proportional integration to the result subtracted each other, the result of the 4th proportional integration processing is revolved with odd times respectively
Turn coordinate transform fac-tor, by the results added of multiplication, the of ac for obtaining individual harmonic current is given；
The of ac of the individual harmonic current is given and is multiplied respectively with impedance factor Ck, and the result of multiplication is distinguished into phase
Add, obtains the modulating wave of the harmonic wave for generating PWM waveform.
12. static reactive generator as claimed in claim 3, which is characterized in that at least one described inverter module
Each inverter module includes: inversion control plate and multiple power devices,
Wherein, the multiple power devices are connected to the alternating current bus bar,
The inversion control plate detects the load current, the output electric current and the fault-signal, and the load is electric
Stream, the output electric current and the fault-signal are sent to master control borad.
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