CN108631326A - Idle and harmonic compensation device based on Buck type three-level AC AC-AC converters - Google Patents
Idle and harmonic compensation device based on Buck type three-level AC AC-AC converters Download PDFInfo
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- CN108631326A CN108631326A CN201810385826.2A CN201810385826A CN108631326A CN 108631326 A CN108631326 A CN 108631326A CN 201810385826 A CN201810385826 A CN 201810385826A CN 108631326 A CN108631326 A CN 108631326A
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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
- H02J3/18—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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a kind of idle and harmonic compensation devices based on Buck type three-level AC AC-AC converters.The device main circuit is made of the Buck type three-level AC AC-AC converters with wattage transformer and traditional reactive-load compensation capacitor, can carry out comprehensive compensation to the idle and harmonic current of three-phase three-wire system grid side；Including three single-phase idle and harmonic compensation main power circuits, wherein the Buck type three-level ACs AC-AC converter of each single-phase wattage transformer includes AC input cell, input filter, Buck type three-level ACs friendship converter unit, output filter and reactive-load compensation capacitor with wattage transformer；The device uses even-order harmonic modulation technique and the gradually control program of harmonic compensation, is compensated to specific subharmonic ingredient.The present invention is small, at low cost, reliability is high, has the advantages that be easy to that modular manufacturing, control strategy be simple, compensation is more with targetedly.
Description
Technical field
It is especially a kind of based on Buck type three-level AC AC-AC converters the invention belongs to Power quality management technical field
Idle and harmonic compensation device.
Background technology
With the development of industrial economy, the inductive loads such as a large amount of induction conductivity, transformer, converters connect
Enter power grid, they can consume idle in the process of running so that a large amount of reactive current can be flowed through in power grid, to keep power grid electric
Drops.When voltage drops to certain threshold value, equipment and load cannot work normally；If voltage continues to reduce, power grid
It can be collapsed because voltage is more than stable operation range.Especially all kinds of power electronic equipment accesses of a large amount of nonlinear load simultaneously
Power grid produces a large amount of harmonic pollution in power grid.In order to support network voltage, power grid power quality is improved, ensures electric power
The safe and reliable operation of system, idle and harmonic compensation are most important.
Grid reactive power compensation technology can be divided into two kinds of static compensation and dynamic compensation.Static reactive power compensation refers in parallel solid
The capacitor or reactor of constant volume cannot meet the dynamic nothing of power grid generation to meet the basic reactive requirement of system
Work(compensates demand.The reactive power compensation planning of the program in failure conditions is also extremely limited, when grid voltage sags, reactive-load compensation
Ability reduces with square multiple of network voltage.Existing dynamic passive compensation scheme mainly uses Static Var Compensator
(SVC), static synchronous compensator (STATCOM).SVC costs are relatively low, and when actual motion is divided into several groups, step by step using thyristor
Switching successively, response speed is slow, and device volume is bigger, low-order harmonic can be injected into power grid, noise is bigger, and cannot be real
Existing idle dynamic continuously adjusts, and in the case where voltage reduces, reactive power compensation planning weakens significantly.Therefore SVC cannot
The dynamic compensation for meeting intermittent regenerative resource requires, and this situation is being further exacerbated by the future.STATCOM master
To be applied to high-power (20Mvar~100Mvar) application field, use inverter structure, DC side generally use large capacity
Electrolytic capacitor as energy storage device, due to the influence that temperature change and electrolyte volatilize etc., the service life of electrolytic capacitor
It is shorter, it needs to regularly replace so that installation and maintenance cost greatly increase, and in single-phase high voltage high-power applications field, inversion
The switching loss of topology is much larger than alternating-current chopper circuit, so that reliability is reduced, cost greatly increases.The major programme of harmonics restraint
It is Active Power Filter-APF (APF), electricity consistent but opposite in phase with harmonic wave forms is generated by Shunt
Stream, to compensate the harmonic current generated by nonlinear load.Traditional active filter is also based on inverter topology, most often
What is seen is voltage source inverter, so there are many problems as traditional reactive power compensator.
In order to cope with the above challenge, there is an urgent need to a kind of reactive power compensation technologies at low cost, with high reliability.It learns in the U.S.
Person Deepak M.Divan propose double virtual orthographic sources (DVQS) theories, devise the reactive-load compensation based on AC wave chopping technology
Device realizes reactive-load compensation using direct converter technique is handed in the case where not needing DC side large volume energy storage device
And harmonic restraining function.The technology disclosure satisfy that the reliability requirement in actual electric network environmental applications, can become in environment temperature
Reliability service under the situations such as change.But the technology is even in a developing stage at present, however it remains of high cost, control strategy
Complicated disadvantage, cannot achieve the idle and harmonic wave comprehensive compensation of three phase network electric current.
Invention content
The purpose of the present invention is to provide a kind of, and the idle and harmonic compensation based on Buck type three-level AC AC-AC converters fills
It sets, to realize the idle and harmonic wave comprehensive compensation function of three phase network electric current.
Realize that the technical solution of the object of the invention is：It is a kind of based on the idle of Buck type three-level AC AC-AC converters and
Harmonic compensation device, including three single-phase idle and harmonic compensation main power circuits, wherein each single-phase idle and harmonic compensation
Main power circuit is all made of the Buck type three-level AC AC-AC converters with wattage transformer and is connected with reactive compensation capacitor, each
Buck type three-level AC AC-AC converters with wattage transformer include AC input cell connected in sequence, input filter,
Buck type three-level ACs with wattage transformer hand over converter unit, output filter and reactive-load compensation capacitor.
Further, described three single-phase idle and harmonic compensation main power circuits are according to Y type connection type parallel connections access
Power grid, power grid are three-phase three-wire system, and neutral ground, each single-phase idle and harmonic compensation main power circuit is corresponding to three with small
The Buck type three-level AC AC-AC converters of power transformer, converter by input filter access power grid, access point with it is idle
The access point of load and nonlinear load is identical, is the points of common connection PCC of power grid, the other end phase of three main power circuits
Continuous cropping is the neutral point of load.
Further, the phase difference of the control signal of the Buck type three-level AC AC-AC converters of three facies tract wattage transformers
It is 120 °, it is identical as three-phase power grid voltage phase.
Further, the input filter includes the first inductance and the first capacitance；First inductance one end with exchange
Input unit anode connects, and the other end is connect with first capacitance one end；The first capacitance other end is negative with AC input cell
Pole connects；
It includes sequentially connected first two-way that the Buck type three-level ACs with wattage transformer, which hand over converter unit (3),
Switching tube, the second two-way switch pipe, third two-way switch pipe, the 4th two-way switch pipe, wattage transformer and the second capacitance；
First two-way switch pipe, the second two-way switch pipe, third two-way switch pipe and the 4th two-way switch pipe, is by two
The switch that a single power switch tube is reversely connected in series to form can bear positive, reversed voltage and current stress, have two-way
Block function；
The output filter includes the second inductance and third capacitance；One end of second inductance and the second two-way switch
The other end of pipe connects, and the other end of the second inductance is connect with one end of third capacitance；The other end of the third capacitance and
The other end of four two-way switch pipes connects；
The reactive-load compensation capacitor includes the 4th capacitance；One end of 4th capacitance connects with one end of third capacitance
It connects, the other end of the 4th capacitance is connect with the other end of third capacitance.
Further, the first two-way switch pipe includes that the first IGBT pipes, the first diode, the 2nd IGBT are managed and the
Two diodes, wherein one end that the drain electrode of the first IGBT pipes is connected with the cathode of the first diode as the first two-way switch pipe,
The anode connection of the source level of first IGBT pipes, the anode of the first diode, the source electrode of the 2nd IGBT pipes and the second diode, second
The other end that the drain electrode of IGBT pipes is connected with the cathode of the second diode as the first two-way switch pipe；Second two-way switch
Pipe includes the 3rd IGBT pipes, third diode, the 4th IGBT are managed and the 4th diode, wherein the drain electrode of the 3rd IGBT pipes and the
The cathodes of three diodes is connected one end as the second two-way switch pipe, the source electrode of the 3rd IGBT pipes, the anode of third diode,
The anode connection of the source electrode and the 4th diode of 4th IGBT pipes, the drain electrode of the 4th IGBT pipes are connected with the cathode of the 4th diode
The other end as the second two-way switch pipe；The third two-way switch pipe includes the 5th IGBT pipes, the 5th diode, the 6th
IGBT is managed and the 6th diode, wherein the drain electrode of the 5th IGBT pipes is connected with the cathode of the 5th diode is used as third two-way opened
Close pipe one end, the source electrode of the 5th IGBT pipes, the anode of the 5th diode, the 6th IGBT pipes source electrode and the 6th diode sun
Pole connects, the other end that the drain electrodes of the 6th IGBT pipes is connected with the cathode of the 6th diode as third two-way switch pipe；It is described
4th two-way switch pipe includes the 7th IGBT pipes, the 7th diode, the 8th IGBT pipe and the 8th diode, wherein the 7th IGBT
One end that the drain electrode of pipe is connected with the cathode of the 7th diode as the 4th two-way switch pipe, the source electrode of the 7th IGBT pipes, the 7th
The anode of the anode of diode, the source electrode of the 8th IGBT pipes and the 8th diode connects, the drain electrode and the eight or two of the 8th IGBT pipes
The connected other end as the 4th two-way switch pipe of the cathode of pole pipe；One end of the first two-way switch pipe and small-power transformation
The primary side Same Name of Ends of device connects, and the other end is connect with one end of one end of the second two-way switch pipe and the second capacitance respectively；It is described
One end of third two-way switch pipe is connect with one end of the second two-way switch pipe, the other end respectively with the 4th two-way switch pipe one
End is connected with one end of the second capacitance；The other end of the primary side non-same polarity and the 4th two-way switch pipe of the wattage transformer
Connection；The secondary side Same Name of Ends of the wattage transformer is connect with one end of the second capacitance, and non-same polarity is another with the second capacitance
One end connects.
Further, Buck type three-level ACs with wattage transformer hand over the second capacitance in converter unit and idle
The 4th capacitance in compensation capacitor is thin-film capacitor.
Compared with prior art, the present invention its remarkable advantage is：(1) use conventional compensation capacitance, may be implemented it is idle and
The comprehensive compensation of harmonic wave, it is at low cost, device reliability is high；(2) the Buck type three-level AC alternations with wattage transformer are used
Parallel operation simplifies control strategy without controlling the voltage on floating capacitance；(3) using gradually harmonic compensation mode, to harmonic wave at
The compensation divided more has specific aim.
Description of the drawings
Fig. 1 is that the present invention is based on the system structures of the idle and harmonic compensation device of Buck type three-level AC AC-AC converters
Figure.
Fig. 2 is the schematic diagram of the Buck type three-level AC AC-AC converters with wattage transformer of the present invention.
Fig. 3 is the control system schematic diagram of the idle and harmonic wave comprehensive compensating device of the present invention.
Specific implementation mode
In conjunction with Fig. 1, Fig. 2, the present invention is based on the idle and harmonic compensation devices of Buck type three-level AC AC-AC converters, including
Three single-phase idle and harmonic compensation main power circuits, wherein each single-phase idle and harmonic compensation main power circuit is all made of band
The Buck type three-level AC AC-AC converters of wattage transformer are connected with reactive compensation capacitor.
As shown in Fig. 2, each the Buck type three-level AC AC-AC converters with wattage transformer include friendship connected in sequence
It flows input unit 1, input filter 2, the Buck type three-level ACs with wattage transformer and hands over converter unit 3, output filter 4
And reactive-load compensation capacitor 5.
Further, described three single-phase idle and harmonic compensation main power circuits are according to Y type connection type parallel connections access
Power grid, power grid are three-phase three-wire system, and neutral ground, each single-phase idle and harmonic compensation main power circuit is corresponding to three with small
The Buck type three-level AC AC-AC converters of power transformer, converter by input filter access power grid, access point with it is idle
The access point of load and nonlinear load is identical, is the points of common connection PCC of power grid, the other end phase of three main power circuits
Continuous cropping is the neutral point of load.
Further, the phase of the control signal of the Buck type three-level AC AC-AC converters of the three facies tracts wattage transformer
Potential difference is 120 °, identical as three-phase power grid voltage phase；
Further concrete scheme is as follows：The input filter 2 includes the first inductance LiWith the first capacitance Ci；Described
One inductance LiOne end is connect with 1 anode of AC input cell, the other end and the first capacitance CiOne end connects；The first capacitance Ci
The other end is connect with 1 cathode of AC input cell；
It includes sequentially connected first two-way opened that the Buck type three-level ACs with wattage transformer, which hand over converter unit 3,
Close pipe K1, the second two-way switch pipe K2, third two-way switch pipe K3, the 4th two-way switch pipe K4, wattage transformer Tr and
Two capacitance Cfly；The first two-way switch pipe K1, the second two-way switch pipe K2, third two-way switch pipe K3And the 4th is two-way
Switching tube K4, be all the switch being reversely connected in series to form by two single power switch tubes, can bear positive, reversed voltage and
Current stress has the function of two-way blocking-up；
The output filter 4 includes the second inductance LfWith third capacitance Cf；The second inductance LfOne end with second pair
To switching tube K2The other end connection, the second inductance LfThe other end and third capacitance CfOne end connection；The third capacitance Cf
The other end and the 4th two-way switch pipe K4The other end connection；
The reactive-load compensation capacitor 5 includes the 4th capacitance Co；The 4th capacitance CoOne end and third capacitance CfOne
End connection, the 4th capacitance CoThe other end and third capacitance CfThe other end connection.
Further concrete scheme is as follows：The first two-way switch pipe K1Including the first IGBT pipes S1a, the first diode
VD1a, the 2nd IGBT pipes S1bAnd the second diode VD1b, wherein the first IGBT pipes S1aDrain electrode and the first diode VD1aThe moon
Extremely it is connected and is used as the first two-way switch pipe K1One end, the first IGBT pipes S1aSource level, the first diode VD1aAnode, second
IGBT pipes S1bSource electrode and the second diode VD1bAnode connection, the 2nd IGBT pipes S1bDrain electrode and the second diode VD1b's
Cathode, which is connected, is used as the first two-way switch pipe K1The other end；The second two-way switch pipe K2Including the 3rd IGBT pipes S2a,
Three diode VD2a, the 4th IGBT pipes S2bAnd the 4th diode VD2b, wherein the 3rd IGBT pipes S2aDrain electrode and third diode
VD2aCathode be connected be used as the second two-way switch pipe K2One end, the 3rd IGBT pipes S2aSource electrode, third diode VD2aSun
Pole, the 4th IGBT pipes S2bSource electrode and the 4th diode VD2bAnode connection, the 4th IGBT pipes S2bDrain electrode and the four or two pole
Pipe VD2bCathode be connected be used as the second two-way switch pipe K2The other end；The third two-way switch pipe K3Including the 5th IGBT
Pipe S3a, the 5th diode VD3a, the 6th IGBT pipes S3bAnd the 6th diode VD3b, wherein the 5th IGBT pipes S3aDrain electrode and the
Five diode VD3aCathode be connected be used as third two-way switch pipe K3One end, the 5th IGBT pipes S3aSource electrode, the 5th diode
VD3aAnode, the 6th IGBT pipes S3bSource electrode and the 6th diode VD3bAnode connection, the 6th IGBT pipes S3bDrain electrode and
Six diode VD3bCathode be connected be used as third two-way switch pipe K3The other end；The 4th two-way switch pipe K4Including
Seven IGBT pipes S4a, the 7th diode VD4a, the 8th IGBT pipes S4bAnd the 8th diode VD4b, wherein the 7th IGBT pipes S4aLeakage
Pole and the 7th diode VD4aCathode be connected be used as the 4th two-way switch pipe K4One end, the 7th IGBT pipes S4aSource electrode, the 7th
Diode VD4aAnode, the 8th IGBT pipes S4bSource electrode and the 8th diode VD4bAnode connection, the 8th IGBT pipes S4bLeakage
Pole and the 8th diode VD4bCathode be connected be used as the 4th two-way switch pipe K4The other end；The first two-way switch pipe K1
One end connect with the primary side Same Name of Ends of wattage transformer Tr, the other end respectively with the second two-way switch pipe K2One end and
Two capacitance CflyOne end connection；The third two-way switch pipe K3One end and the second two-way switch pipe K2One end connection, separately
One end respectively with the 4th two-way switch pipe K4One end and the second capacitance CflyOne end connection；The wattage transformer Tr's
Primary side non-same polarity and the 4th two-way switch pipe K4The other end connection；The secondary side Same Name of Ends of the wattage transformer Tr and
Two capacitance CflyOne end connection, non-same polarity and the second capacitance CflyThe other end connection.
Further, the Buck type three-level ACs with wattage transformer hand over the second capacitance C in converter unit 3fly
And the 4th capacitance C in reactive-load compensation capacitor 5oIt is thin-film capacitor；The compensation device modulates skill using even-order harmonic
The control program of art and gradually harmonic compensation compensates specific subharmonic ingredient.
The present invention using when variable duty cycle control the Buck type three-level AC AC-AC converters with wattage transformer, convert
Device injects the electric current of capacitive ingredient and each harmonic ingredient into power grid.90 ° of the advanced network voltage of capacity current realizes power grid electricity
The compensation of idle ingredient in stream；Harmonic components are equal in magnitude in individual harmonic current and power network current, opposite in phase, realize to electricity
The compensation of harmonic components in net electric current.By the control of clock synchronization variable duty cycle, dynamic idle to three-phase and harmonic current is realized
Comprehensive compensation.
In conjunction with shown in Fig. 3, control strategy of the invention uses the control of even-order harmonic modulation technique and comprehensive harmonic compensation
Scheme detects the voltage and current in three phase network, it is big to obtain idle and specific subharmonic using corresponding calculation first
It is small, using idle and specific subharmonic as command signal, even modulation wave signal is obtained by corresponding algorithm, is modulated by even
Wave signal obtains handing over the switching drive signal of AC-AC converter.
The present invention is based on the basic functional principles of the idle and harmonic compensation device of Buck type three-level AC AC-AC converters such as
Under：
As shown in Fig. 2, when load is capacitance, the input of the Buck type three-level AC AC-AC converters with wattage transformer
Output characteristics is：
In formula, single-phase voltage on line side us(t)=UmSin ω t, C are the capacitance of compensation capacitor, and D is band wattage transformer
Buck type three-level AC AC-AC converters duty ratio, uo(t) it is the output voltage of converter, io(t) it is the output of converter electricity
Stream, then the reactive-load compensation electric current i that the Buck type three-level AC AC-AC converters with wattage transformer are injected into power gridc(t) it is：
ic(t)=ω CD2Umcosωt (2)
1, idle and harmonic compensation principle
Even-order harmonic modulation technique is exactly that even sine variations per hour is added in the duty ratio of converter, at this time will be
The input side of converter obtains odd times electric current, when odd times current component size is equal with the harmonic component in power grid, opposite in phase
When, the harmonic wave in power grid is just compensated.The formula of duty ratio is as follows：
In formula, d0For the definite value in duty ratio；dnFor the amplitude of n times modulating wave in duty ratio；φnFor the phase of n times modulating wave
Position；N is positive even numbers.
As n=2, formula (3) is brought into formula (1), can be obtained：
From being can be seen that in above formula when containing secondary modulation wave in duty ratio, contain base in converter input side electric current
Wave reactive component, 3 times and 5 compensation electric currents, amplitude and phase are determined by even order components in duty ratio.By being modulated to even
The control of wave, can obtain and amplitude in power grid is equal in magnitude, fundamental wave reactive power of opposite in phase and harmonic current, to realize pair
Idle and harmonic current compensation in power grid.
It is single-phase idle and harmonic wave comprehensive compensation principle above, it is shown in FIG. 1 to be based on Buck type three-level AC AC-AC converters
Idle and harmonic compensation device compensation principle it is similar with single-phase, three-phase compensation electric current expression formula be：
2, control principle
The idle and harmonic compensation device based on Buck type three-level AC AC-AC converters of the present invention is modulated using even
Wave compensates specific subharmonic, needs to do different processing for different harmonic waves, so needing to detect in power grid
Reactive component and each harmonic component compensate respectively, that is, the gradually control strategy of harmonic compensation, control block diagram
As shown in Figure 3.
isa、isb、iscIt is the three-phase voltage of power grid, the current signal in three-phase circuit is detected by current detection circuit,
The active component i of fundamental wave and each harmonic can be obtained using coordinate transformpWith reactive component iq, by idle point of fundamental current
Measure iqIdle DC component can be obtained by a low-pass filter, which is missed later compared with reference signal
Difference signal obtains the control signal of converter, i.e. constant component in duty ratio using proportional and integral controller.Similarly, will
The active component i of each harmonicpWith reactive component iqBy low-pass filter obtain the active and idle direct current of harmonic current at
Point, using pi regulator after these signals are compared with a reference value, then the output signal of pi regulator is carried out anti-
Transformation obtains controlling the even modulating wave in signal, that is, duty ratio accordingly.The duty ratio constant component that will finally obtain
And even ingredient variable duty cycle when being added to obtain three-phase.
Embodiment 1
In conjunction with Fig. 1, Fig. 2, a kind of idle and harmonic compensation device based on Buck type three-level AC AC-AC converters, including three
A single-phase idle and harmonic compensation main power circuit, wherein each single-phase idle and harmonic compensation main power circuit is all made of with small
The Buck type three-level AC AC-AC converters of power transformer are connected with reactive compensation capacitor.
As shown in Fig. 2, each the Buck type three-level AC AC-AC converters with wattage transformer include friendship connected in sequence
It flows input unit 1, input filter 2, the Buck type three-level ACs with wattage transformer and hands over converter unit 3, output filter 4
And reactive-load compensation capacitor 5.
The input filter 2 includes the first inductance LiWith the first capacitance Ci；The first inductance LiOne end with exchange input
1 anode connection of unit, the other end and the first capacitance CiOne end connects；The first capacitance CiThe other end and AC input cell 1 are negative
Pole connects；
It includes sequentially connected first two-way opened that the Buck type three-level ACs with wattage transformer, which hand over converter unit 3,
Close pipe K1, the second two-way switch pipe K2, third two-way switch pipe K3, the 4th two-way switch pipe K4, wattage transformer Tr and
Two capacitance Cfly；The first two-way switch pipe K1, the second two-way switch pipe K2, third two-way switch pipe K3And the 4th is two-way
Switching tube K4, be all the switch being reversely connected in series to form by two single power switch tubes, can bear positive, reversed voltage and
Current stress has the function of two-way blocking-up；The first two-way switch pipe K1Including the first IGBT pipes S1a, the first diode VD1a、
2nd IGBT pipes S1bAnd the second diode VD1b, wherein the first IGBT pipes S1aDrain electrode and the first diode VD1aCathode phase
Continuous cropping is the first two-way switch pipe K1One end, the first IGBT pipes S1aSource level, the first diode VD1aAnode, the 2nd IGBT
Pipe S1bSource electrode and the second diode VD1bAnode connection, the 2nd IGBT pipes S1bDrain electrode and the second diode VD1bCathode
It is connected and is used as the first two-way switch pipe K1The other end；The second two-way switch pipe K2Including the 3rd IGBT pipes S2a, the three or two
Pole pipe VD2a, the 4th IGBT pipes S2bAnd the 4th diode VD2b, wherein the 3rd IGBT pipes S2aDrain electrode and third diode VD2a
Cathode be connected be used as the second two-way switch pipe K2One end, the 3rd IGBT pipes S2aSource electrode, third diode VD2aAnode,
4th IGBT pipes S2bSource electrode and the 4th diode VD2bAnode connection, the 4th IGBT pipes S2bDrain electrode and the 4th diode
VD2bCathode be connected be used as the second two-way switch pipe K2The other end；The third two-way switch pipe K3It is managed including the 5th IGBT
S3a, the 5th diode VD3a, the 6th IGBT pipes S3bAnd the 6th diode VD3b, wherein the 5th IGBT pipes S3aDrain electrode and the 5th
Diode VD3aCathode be connected be used as third two-way switch pipe K3One end, the 5th IGBT pipes S3aSource electrode, the 5th diode
VD3aAnode, the 6th IGBT pipes S3bSource electrode and the 6th diode VD3bAnode connection, the 6th IGBT pipes S3bDrain electrode and
Six diode VD3bCathode be connected be used as third two-way switch pipe K3The other end；The 4th two-way switch pipe K4Including
Seven IGBT pipes S4a, the 7th diode VD4a, the 8th IGBT pipes S4bAnd the 8th diode VD4b, wherein the 7th IGBT pipes S4aLeakage
Pole and the 7th diode VD4aCathode be connected be used as the 4th two-way switch pipe K4One end, the 7th IGBT pipes S4aSource electrode, the 7th
Diode VD4aAnode, the 8th IGBT pipes S4bSource electrode and the 8th diode VD4bAnode connection, the 8th IGBT pipes S4bLeakage
Pole and the 8th diode VD4bCathode be connected be used as the 4th two-way switch pipe K4The other end；The first two-way switch pipe K1
One end connect with the primary side Same Name of Ends of wattage transformer Tr, the other end respectively with the second two-way switch pipe K2One end and
Two capacitance CflyOne end connection；The third two-way switch pipe K3One end and the second two-way switch pipe K2One end connection, separately
One end respectively with the 4th two-way switch pipe K4One end and the second capacitance CflyOne end connection；The wattage transformer Tr's
Primary side non-same polarity and the 4th two-way switch pipe K4The other end connection；The secondary side Same Name of Ends of the wattage transformer Tr and
Two capacitance CflyOne end connection, non-same polarity and the second capacitance CflyThe other end connection；
The output filter 4 includes the second inductance LfWith third capacitance Cf；The second inductance LfOne end with second pair
To switching tube K2The other end connection, the second inductance LfThe other end and third capacitance CfOne end connection；The third capacitance Cf
The other end and the 4th two-way switch pipe K4The other end connection；
The reactive-load compensation capacitor 5 includes the 4th capacitance Co；The 4th capacitance CoOne end and third capacitance CfOne
End connection, the 4th capacitance CoThe other end and third capacitance CfThe other end connection.
Relative to traditional idle and harmonic wave comprehensive compensating device based on inverter structure, the present invention is based on Buck types three
Level hands over the idle and harmonic compensation device of AC-AC converter using conventional compensation capacitance, may be implemented idle and harmonic wave comprehensive
Compensation is closed, it is at low cost, device reliability is high.In addition, the present invention uses the Buck type three-level ACs with wattage transformer
AC-AC converter simplifies control strategy without controlling the voltage on floating capacitance；Traditional compensation way be detect it is idle and
The mode that harmonic wave total amount compensates together, and the present invention is using gradually harmonic compensation mode, this to the compensation of harmonic components more
Add with specific aim.
Claims (6)
1. a kind of idle and harmonic compensation device based on Buck type three-level AC AC-AC converters, which is characterized in that including three
Single-phase idle and harmonic compensation main power circuit, wherein each single-phase idle and harmonic compensation main power circuit is all made of with small work(
The Buck type three-level AC AC-AC converters of rate transformer are connected with reactive compensation capacitor, each the Buck types with wattage transformer
Three-level AC AC-AC converter includes AC input cell connected in sequence (1), input filter (2), with wattage transformer
Buck type three-level ACs hand over converter unit (3), output filter (4) and reactive-load compensation capacitor (5).
2. the idle and harmonic compensation device according to claim 1 based on Buck type three-level AC AC-AC converters, special
Sign is that described three single-phase idle and harmonic compensation main power circuits are according to Y type connection type parallel connections access power grid, power grid
Three-phase three-wire system, neutral ground, each single-phase idle and harmonic compensation main power circuit correspond to three band wattage transformers
Buck type three-level AC AC-AC converters, converter accesses power grid by input filter, access point and reactive load and non-
The access point of linear load is identical, is the points of common connection PCC of power grid, and the other end of three main power circuits is connected as load
Neutral point.
3. the idle and harmonic compensation device of Buck types three-level AC AC-AC converter according to claim 1 or 2, feature
It is, the phase difference of the control signal of the Buck type three-level AC AC-AC converters of three facies tract wattage transformers is 120 °, with
Three-phase power grid voltage phase is identical.
4. the idle and harmonic compensation device according to claim 3 based on Buck type three-level AC AC-AC converters, special
Sign is that the input filter (2) includes the first inductance (Li) and the first capacitance (Ci)；First inductance (the Li) one end with
AC input cell (1) anode connection, the other end and the first capacitance (Ci) one end connection；First capacitance (the Ci) other end with
AC input cell (1) cathode connects；
It includes sequentially connected first two-way switch that the Buck type three-level ACs with wattage transformer, which hand over converter unit (3),
Manage (K1), the second two-way switch pipe (K2), third two-way switch pipe (K3), the 4th two-way switch pipe (K4), wattage transformer
(Tr) and the second capacitance (Cfly)；The first two-way switch pipe (K1), the second two-way switch pipe (K2), third two-way switch
Manage (K3) and the 4th two-way switch pipe (K4), it is the switch being reversely connected in series to form by two single power switch tubes, can holds
By positive, reversed voltage and current stress, has the function of two-way blocking-up；
The output filter (4) includes the second inductance (Lf) and third capacitance (Cf)；Second inductance (the Lf) one end and the
Two two-way switch pipe (K2) the other end connection, the second inductance (Lf) the other end and third capacitance (Cf) one end connection；It is described
Third capacitance (Cf) the other end and the 4th two-way switch pipe (K4) the other end connection；
The reactive-load compensation capacitor (5) includes the 4th capacitance (Co)；4th capacitance (the Co) one end and third capacitance (Cf)
One end connection, the 4th capacitance (Co) the other end and third capacitance (Cf) the other end connection.
5. the idle and harmonic compensation device according to claim 4 based on Buck type three-level AC AC-AC converters, special
Sign is, the first two-way switch pipe (K1) include that the first IGBT manages (S1a), the first diode (VD1a), the 2nd IGBT pipe
(S1b) and the second diode (VD1b), wherein the first IGBT manages (S1a) drain electrode and the first diode (VD1a) cathode be connected
As the first two-way switch pipe (K1) one end, the first IGBT manage (S1a) source level, the first diode (VD1a) anode, second
IGBT manages (S1b) source electrode and the second diode (VD1b) anode connection, the 2nd IGBT manage (S1b) drain electrode and the second diode
(VD1b) cathode be connected be used as the first two-way switch pipe (K1) the other end；The second two-way switch pipe (K2) include third
IGBT manages (S2a), third diode (VD2a), the 4th IGBT manage (S2b) and the 4th diode (VD2b), wherein the 3rd IGBT is managed
(S2a) drain electrode and third diode (VD2a) cathode be connected be used as the second two-way switch pipe (K2) one end, the 3rd IGBT pipe
(S2a) source electrode, third diode (VD2a) anode, the 4th IGBT manage (S2b) source electrode and the 4th diode (VD2b) anode
Connection, the 4th IGBT manage (S2b) drain electrode and the 4th diode (VD2b) cathode be connected be used as the second two-way switch pipe (K2)
The other end；The third two-way switch pipe (K3) include that the 5th IGBT manages (S3a), the 5th diode (VD3a), the 6th IGBT pipe
(S3b) and the 6th diode (VD3b), wherein the 5th IGBT manages (S3a) drain electrode and the 5th diode (VD3a) cathode be connected
As third two-way switch pipe (K3) one end, the 5th IGBT manage (S3a) source electrode, the 5th diode (VD3a) anode, the 6th
IGBT manages (S3b) source electrode and the 6th diode (VD3b) anode connection, the 6th IGBT manage (S3b) drain electrode and the 6th diode
(VD3b) cathode be connected be used as third two-way switch pipe (K3) the other end；The 4th two-way switch pipe (K4) include the 7th
IGBT manages (S4a), the 7th diode (VD4a), the 8th IGBT manage (S4b) and the 8th diode (VD4b), wherein the 7th IGBT is managed
(S4a) drain electrode and the 7th diode (VD4a) cathode be connected be used as the 4th two-way switch pipe (K4) one end, the 7th IGBT pipe
(S4a) source electrode, the 7th diode (VD4a) anode, the 8th IGBT manage (S4b) source electrode and the 8th diode (VD4b) anode
Connection, the 8th IGBT manage (S4b) drain electrode and the 8th diode (VD4b) cathode be connected be used as the 4th two-way switch pipe (K4)
The other end；The first two-way switch pipe (K1) one end connect with the primary side Same Name of Ends of wattage transformer (Tr), the other end
Respectively with the second two-way switch pipe (K2) one end and the second capacitance (Cfly) one end connection；The third two-way switch pipe (K3)
One end and the second two-way switch pipe (K2) one end connection, the other end respectively with the 4th two-way switch pipe (K4) one end and
Two capacitance (Cfly) one end connection；The primary side non-same polarity and the 4th two-way switch pipe (K of the wattage transformer (Tr)4)
The other end connection；The secondary side Same Name of Ends and the second capacitance (C of the wattage transformer (Tr)fly) one end connection, it is non-of the same name
End and the second capacitance (Cfly) the other end connection.
6. the idle and harmonic compensation device according to claim 4 based on Buck type three-level AC AC-AC converters, special
Sign is that the Buck type three-level ACs with wattage transformer hand over the second capacitance (C in converter unit (3)fly) and idle benefit
Repay the 4th capacitance (C in capacitor (5)o) it is thin-film capacitor.
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