CN106787705A - The control device and method of the two-way DC converter based on LCL filter - Google Patents
The control device and method of the two-way DC converter based on LCL filter Download PDFInfo
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- CN106787705A CN106787705A CN201710070587.7A CN201710070587A CN106787705A CN 106787705 A CN106787705 A CN 106787705A CN 201710070587 A CN201710070587 A CN 201710070587A CN 106787705 A CN106787705 A CN 106787705A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/143—Arrangements for reducing ripples from dc input or output using compensating arrangements
Abstract
The invention discloses the control device and method of a kind of two-way DC converter based on LCL filter, including two-way DC converter, phase shift current sharing control module, active damping control module, control model selecting module, high-pressure side dispatch from foreign news agency pressure ring Isobarically Control module and low-pressure side dispatch from foreign news agency pressure ring Isobarically Control module；Active damping control module includes the 4th current sensor, 4th comparison module, first pi controller, trapper module, lag network module and stream ratio module, 4th current sensor, 4th comparison module, first pi controller, trapper module, lag network module and stream ratio module are sequentially connected in series, the present invention both can guarantee that two-way DC converter long-term safety stable operation, two-way DC converter can be made to obtain good static and dynamic performance again, and be easily achieved, it is highly suitable to be applied for the control of the two-way DC converter of LCL filter.
Description
Technical field
LCL is based on the present invention relates to new energy grid-connected power and energy storage converter studying technological domain, more particularly to one kind
The control device and method of the two-way DC converter of wave filter.
Background technology
It is related to new energy grid-connected power and energy storage converter studying technological domain new, extensively using bidirectional, dc conversion
Device as energy-storage battery group and two-way AC/DC convertor, direct-current grid, DC distribution net interface equipment, wherein LCL filters
Ripple device three-phase staggered bi-directional DC converter, smaller with low-pressure side ripple current, switching tube current stress is smaller, power density
High the advantages of.
However, LCL filter and interleaving technique are introduced two-way by LCL filter three-phase staggered bi-directional DC converter
One Buck-Boost converter body, requirement higher is proposed to system control strategy.On the one hand, LCL filter improves the rank of system
Number, this structure can show relatively low impedance at resonance point, cause system resonance, cause system unstability；On the other hand, hand over
Wrong parallel technology then improves requirement of the system to converter three-phase phase shifting sharing control strategy, uneven when there is three-phase current
When, system input current ripples can be significantly increased, and so as to cause system heat generation, efficiency declines.
The content of the invention
The technical problems to be solved by the invention are directed to above-mentioned the deficiencies in the prior art and provide a kind of based on LCL filter
Two-way DC converter control device and method, this based on LCL filter two-way DC converter control device and
Method solves the stability of a system and the equal flow problem of crisscross parallel that the two-way DC converter based on LCL filter has.
To realize above-mentioned technical purpose, the technical scheme that the present invention takes is：
A kind of control device of the two-way DC converter based on LCL filter, including two-way DC converter, phase shift are equal
Flow control module, active damping control module, control model selecting module, high-pressure side dispatch from foreign news agency pressure ring Isobarically Control module and low pressure
Side dispatch from foreign news agency pressure ring Isobarically Control module；
Described two-way DC converter includes the low-pressure side equivalent source VL, the three-phase crisscross parallel LCL that are sequentially connected electrically
Wave filter, three-phase crisscross parallel switching tube, high-pressure side filter capacitor C2 and high-pressure side equivalent source VH, the three-phase crisscross parallel
LCL filter includes low-pressure side filter inductance L1, low-pressure side filter inductance L2, low-pressure side filter inductance L3, low-pressure side filtered electrical
Sense L4 and low-pressure side filter capacitor C1；
The phase shift current sharing control module include the first current sensor, the second current sensor, the 3rd current sensor,
First comparison module, the second comparison module, the 3rd comparison module, the first proportional controller, the second proportional controller, the 3rd ratio
Controller, the first triangular modulation module, the second triangular modulation module and the 3rd triangular modulation module, first electric current
Sensor, the first comparison module, the first proportional controller and the first triangular modulation module are sequentially connected in series, and second electric current is passed
Sensor, the second comparison module, the second proportional controller and the second triangular modulation module are sequentially connected in series, the 3rd current sense
Device, the 3rd comparison module, the 3rd proportional controller and the 3rd triangular modulation module are sequentially connected in series, first triangular modulation
Module, the second triangular modulation module and the 3rd triangular modulation module are connected with three-phase crisscross parallel switching tube respectively, described
First current sensor is used to measure the electric current of low-pressure side filter inductance L2, and second current sensor is used to measure low-pressure side
The electric current of filter inductance L3, the 3rd current sensor is used to measure the electric current of low-pressure side filter inductance L4；
The active damping control module includes the 4th current sensor, the 4th comparison module, the first proportional plus integral control
Device, trapper module, lag network module and flow ratio module, the 4th current sensor, the 4th comparison module, first
Pi controller, trapper module, lag network module and stream ratio module are sequentially connected in series, described to flow ratio module
It is connected with the first comparison module, the second comparison module and the 3rd comparison module respectively, the 4th current sensor is used to measure
The electric current of low-pressure side filter inductance L1；
The control model selecting module is connected with top level control device；
The high-pressure side dispatch from foreign news agency pressure ring Isobarically Control module includes first voltage sensor, the 5th comparison module and the second ratio
Example integral controller, the first voltage sensor, the 5th comparison module and the second pi controller are sequentially connected in series, described
Second pi controller is connected with the control model selecting module, and the 5th comparison module connects with top level control device
Connect, the first voltage sensor is used to measure the both end voltage of high-pressure side filter capacitor C2；
The low-pressure side dispatch from foreign news agency pressure ring Isobarically Control module includes second voltage sensor, the 6th comparison module and the 3rd ratio
Example integral controller, the second voltage sensor, the 6th comparison module and the 3rd pi controller are sequentially connected in series, described
3rd pi controller is connected with the control model selecting module, and the 6th comparison module connects with top level control device
Connect, the second voltage sensor is used to measure the both end voltage of low-pressure side filter capacitor C1.
Used as further improved technical scheme of the present invention, the three-phase crisscross parallel switching tube includes carrying inverse parallel two
The transistor S1 of pole pipe, transistor S2, transistor S3, transistor S4, transistor S5 and transistor S6, the transistor S1, crystalline substance
The collector terminal of body pipe S3 and transistor S5 with one end of high-pressure side filter capacitor C2 and high-pressure side equivalent source VH voltage just
End.
Used as further improved technical scheme of the present invention, one end of the low-pressure side filter inductance L1 is equivalent with low-pressure side
Power supply VL positive voltage terminals are connected, the other end of low-pressure side filter inductance L1 one end respectively with low-pressure side filter inductance L2,
One end connection of one end of low-pressure side filter inductance L3, one end of low-pressure side filter inductance L4 and pressure side filter capacitor C1, it is described
The other end of low-pressure side filter inductance L2 is connected with the emitter stage of transistor S1 and the colelctor electrode of transistor S2 respectively, the low pressure
The other end of side filter inductance L3 is connected with transistor S3 emitter stages and transistor S4 colelctor electrodes respectively, the low-pressure side filtered electrical
The other end for feeling L4 is connected with transistor S5 emitter stages and transistor S6 colelctor electrodes respectively, the low-pressure side equivalent source VL voltages
The negative terminal other end, the emitter stage of transistor S2, the emitter stage of transistor S4, transistor S6 respectively with low-pressure side filter capacitor C1
Emitter stage, the other end of high-pressure side filter capacitor C2 and high-pressure side equivalent source VH voltages negative terminal connection.
Used as further improved technical scheme of the present invention, the phase shift current sharing control module also includes that first postpones mould
Block, the second Postponement module and the 3rd Postponement module, the first triangular modulation module by the first Postponement module respectively with crystalline substance
Body pipe S1 and transistor S2 are connected, the second triangular modulation module by the second Postponement module respectively with transistor S3 and crystalline substance
Body pipe S4 is connected, and the 3rd triangular modulation module is connected with transistor S5 and transistor S6 respectively by the 3rd Postponement module
Connect.
Another technical scheme that the present invention takes is：
A kind of control method of the control device of the two-way DC converter based on LCL filter, specifically includes following step
Suddenly：
Step 1：Second voltage sensor measurement low-pressure side filter capacitor in low-pressure side dispatch from foreign news agency pressure ring Isobarically Control module
The both end voltage v of C1L, the 6th comparison module is by voltage vLThe low-pressure side voltage definite value v given with top level control deviceLrefThan difference, obtain
To difference △ vL, the 3rd pi controller is to difference △ vLProportional plus integral control is carried out, extrinsic current ring reference value is obtained
iL1ref, supply control model selecting module；First voltage sensor measurement in the dispatch from foreign news agency pressure ring Isobarically Control module of high-pressure side is high
The both end voltage v of pressure side filter capacitor C2H, the 5th comparison module is by voltage vHDetermine with the high side voltage that top level control device gives
Value vHrefThan difference, difference △ v are obtainedH, the second pi controller is to difference △ vHProportional plus integral control is carried out, dispatch from foreign news agency is obtained
Stream ring reference value iL1ref, supply control model selecting module；The extrinsic current ring reference value i that top level control device is directly specifiedL1refAnd
Supply control model selecting module；
Step 2：Control model selecting module for one-out-three control model selecting module, control model selecting module according to
The control instruction of top level control device selects the control model of two-way DC converter, and by low-pressure side dispatch from foreign news agency pressure ring Isobarically Control mould
The extrinsic current ring reference value i of block outputL1ref, the output of high-pressure side dispatch from foreign news agency pressure ring Isobarically Control module extrinsic current ring reference value
iL1refThe extrinsic current ring reference value i directly specified with top level control deviceL1refIn thrin as iL1refIt is supplied to active resistance
Buddhist nun's control module；
Step 3:The electric current i of the 4th current sensor measurement low-pressure side filter inductance L1 in active damping control moduleL1,
4th comparison module is by electric current iL1Extrinsic current ring reference value i selected with control model selecting moduleL1refIt is poor than difference
Value △ iL1, the first pi controller is to difference △ iL1Proportional plus integral control, obtains control variables ic1, trapper module pair
The resonance spikes of three-phase crisscross parallel LCL filter are compensated and lag network module is to three-phase crisscross parallel LCL filter
The Parameters variation of appearance carries out redundancy compensation, the signal i after being compensatedc1 *, signal ic1 *It is respectively by flowing ratio module
The first comparison module in phase shift current sharing control module provides current reference value iL2ref, provide current reference for the second comparison module
Value iL3refWith provide current reference value i for the 3rd comparison moduleL4ref；
Step 4：The electricity of the first current sensor measurement low-pressure side filter inductance L2 in the phase shift current sharing control module
Stream iL2, the electric current i of the second current sensor measurement low-pressure side filter inductance L3L3, the filtering of the 3rd current sensor measurement low-pressure side
The electric current i of inductance L4L4, the first comparison module is by electric current iL2With current reference value iL2refThan difference, difference △ i are obtainedL2, the second ratio
Compared with module by electric current iL3With current reference value iL3refThan difference, difference △ i are obtainedL3, the 3rd comparison module is by electric current iL4Join with electric current
Examine value iL4refThan difference, difference △ i are obtainedL4, the first proportional controller is to difference △ iL2The ratio of carrying out control, obtains controlled quentity controlled variable vc2,
Second proportional controller is to difference △ iL3The ratio of carrying out control, obtains controlled quentity controlled variable vc3, the 3rd proportional controller is to difference △ iL4Enter
Row ratio is controlled, and obtains controlled quentity controlled variable vc4, controlled quentity controlled variable vc2Dutycycle is obtained for d by the first triangular modulation module1Driving arteries and veins
Punching, controlled quentity controlled variable vc3Dutycycle is obtained for d by the second triangular modulation module2Driving pulse, controlled quentity controlled variable vc4By the three or three
Angle ripple modulation module obtains dutycycle for d3Driving pulse, dutycycle is d1Driving pulse by after the first Postponement module control
The switch of transistor S1 processed and transistor S2, dutycycle is d2Driving pulse by controlling transistor S3 after the second Postponement module
With the switch of transistor S4, dutycycle is d3Driving pulse by controlling transistor S5 and transistor S6 after the 3rd Postponement module
Switch.
As further improved technical scheme of the present invention, the transistor S1, transistor S2, transistor S3, transistor
S4, transistor S5 and transistor S6 are insulated gate bipolar transistor IGBT.
As further improved technical scheme of the present invention, the biography of the trapper module in the active damping control module
Delivery function is：
Wherein, ωnFor trapper characteristic angular frequency (corresponding characteristic frequency be fn), Q is the quality factor of trapper,
The characteristic frequency fnValue it is equal with the resonant frequency of three-phase crisscross parallel LCL filter.
As further improved technical scheme of the present invention, lag network module in the active damping control module
Transmission function is：
Wherein, b is the indexing coefficient (b of lag network<1), T is time constant (the corresponding handing-over frequency of lag network), the handing-over frequency fTValue be taken as trapper characteristic frequency fn1/10th, indexing coefficient b values be characterized frequency
Rate fnTen times.
The present invention has the advantages that：
(1) three interior electric current loops that control device proposed by the invention and control method pass through phase shift current sharing control module
Three-phase circuit to two-way DC converter realizes fast and reliable phase shift sharing control；
(2) control device proposed by the invention and control method are made up of trapper module and lag network module
Active damping control of the active damping real-time performance to two-way DC converter, trapper module and the common structure of lag network module
The active damping compensation of paired extrinsic current ring, greatly improves the stability and reliability of two-way DC converter；
(3) control device proposed by the invention and control method are by the active damping net in active damping control module
Lag network module is added in network, it is ensured that cause parameter to occur in the LCL filter long-term use contained by two-way DC converter
In the case of certain deviation, two-way DC converter remains unchanged holding safe and stable operation.
Brief description of the drawings
Fig. 1 is topological structure schematic diagram of the invention.
Fig. 2 is of the invention in the case of without active damping network building out, the open loop Bode diagram of extrinsic current ring.
Fig. 3 is of the invention in the case where active damping network building out is sealed in, the open loop Bode diagram of extrinsic current ring.
When Fig. 4 is present invention selection high-pressure side Isobarically Control pattern, the both end voltage v of high-pressure side filter capacitor C2HWaveform.
When Fig. 5 is present invention selection high-pressure side Isobarically Control pattern, the electric current i of low-pressure side filter inductanceL2、iL3、iL4Ripple
Shape.
When Fig. 6 is present invention selection high-pressure side Isobarically Control pattern, the electric current i of low-pressure side filter inductanceL2、iL3、iL4Staggeredly
Waveform after parallel connection.
When Fig. 7 is present invention selection high-pressure side Isobarically Control pattern, the electric current i of low-pressure side filter inductanceL1Waveform.
Specific embodiment
Specific embodiment of the invention is further illustrated below according to Fig. 1 to Fig. 7：
As shown in figure 1, a kind of control device of the two-way DC converter based on LCL filter, including the control device
The two-way DC converter applied, the phase shift current sharing control module of interior electric current loop, the active damping control module of extrinsic current ring,
Control model selecting module 12, high-pressure side dispatch from foreign news agency pressure ring Isobarically Control module and low-pressure side dispatch from foreign news agency pressure ring Isobarically Control module；It is double
To DC converter include be sequentially connected electrically low-pressure side equivalent source VL, three-phase crisscross parallel LCL filter, three it is staggered simultaneously
Connection switching tube, high-pressure side filter capacitor C2 and high-pressure side equivalent source VH, the three-phase crisscross parallel LCL filter include low pressure
Side filter inductance L1, low-pressure side filter inductance L2, low-pressure side filter inductance L3, low-pressure side filter inductance L4 and low-pressure side filtered electrical
Hold C1；The phase shift current sharing control module of interior electric current loop includes the first current sensor, the second current sensor, the 3rd current sense
Device, the first comparison module 1, the second comparison module 2, the 3rd comparison module 3, the first proportional controller P1, the second proportional controller
P2, the 3rd proportional controller P3, the first triangular modulation module 4, the second triangular modulation module 5 and the 3rd triangular modulation mould
Block 6, first current sensor, the first comparison module 1, the first proportional controller P1 and the first triangular modulation module 4 according to
Secondary series connection, second current sensor, the second comparison module 2, the second proportional controller P2 and the second triangular modulation module 5
It is sequentially connected in series, the 3rd current sensor, the 3rd comparison module 3, the 3rd proportional controller P3 and the 3rd triangular modulation mould
Block 6 is sequentially connected in series, the first triangular modulation module 4, the second triangular modulation module 5 and the 3rd triangular modulation module 6
It is connected with three-phase crisscross parallel switching tube respectively, first current sensor is used to measure the electricity of low-pressure side filter inductance L2
Stream, second current sensor is used to measure the electric current of low-pressure side filter inductance L3, and the 3rd current sensor is used to survey
The electric current of amount low-pressure side filter inductance L4；The active damping control module of extrinsic current ring includes the 4th current sensor, the 4th ratio
Compared with module 11, the first pi controller PI1, the trapper module Gn of cascade compensation, cascade compensation lag network module
Gc and stream ratio module 10, the 4th current sensor, the 4th comparison module 11, the first pi controller PI1, fall into
Ripple device module Gn, lag network module Gc and stream ratio module 10 is sequentially connected in series, the stream ratio module 10 is respectively with the
One comparison module 1, the second comparison module 2 and the 3rd comparison module 3 are connected, and the 4th current sensor is used to measure low-pressure side
The electric current of filter inductance L1, the trapper module of cascade compensation, the resonance spikes to LCL filter are compensated, cascade compensation
Lag network module, the Parameters variation being likely to occur to LCL filter carries out redundancy compensation, trapper module and lag network
Module collectively forms the active damping compensation of external electric current loop；The control model selecting module 12 is connected with top level control device；
Control model selecting module 12 is a control model selecting module for one-out-three, by the instruction of top level control device, selects LCL
The control model of wave filter three-phase staggered bi-directional DC converter, by outside high-pressure side dispatch from foreign news agency pressure ring Isobarically Control module, low-pressure side
The extrinsic current ring reference value thrin output of Voltage loop Isobarically Control module or that top level control device is directly specified is used as iL1ref
It is supplied to the active damping control module of extrinsic current ring；The high-pressure side dispatch from foreign news agency pressure ring Isobarically Control module is passed including first voltage
Sensor, the 5th comparison module 13 and the second pi controller PI2, the first voltage sensor, the 5th comparison module 13
It is sequentially connected in series with the second pi controller PI2, the second pi controller PI2 selects mould with the control model
Block 12 is connected, and the 5th comparison module 13 is connected with top level control device, and the first voltage sensor is used to measure high-pressure side
The both end voltage of filter capacitor C2；The low-pressure side dispatch from foreign news agency pressure ring Isobarically Control module includes second voltage sensor, the 6th ratio
Compared with the pi controller PI3 of module 14 and the 3rd, the second voltage sensor, the 6th comparison module 14 and the 3rd ratio product
Sub-controller PI3 is sequentially connected in series, and the 3rd pi controller PI3 is connected with the control model selecting module 12, institute
State the 6th comparison module 14 to be connected with top level control device, the second voltage sensor is used to measure low-pressure side filter capacitor C1's
Both end voltage.
Further, the three-phase crisscross parallel switching tube includes transistor S1, transistor with anti-paralleled diode
S2, transistor S3, transistor S4, transistor S5 and transistor S6, the current collection of the transistor S1, transistor S3 and transistor S5
Extreme one end and high-pressure side equivalent source VH positive voltage terminals with high-pressure side filter capacitor C2.
Further, one end of the low-pressure side filter inductance L1 is connected with low-pressure side equivalent source VL positive voltage terminals, institute
State the other end of low-pressure side filter inductance L1 one end, the one of low-pressure side filter inductance L3 respectively with low-pressure side filter inductance L2
One end connection at end, one end of low-pressure side filter inductance L4 and pressure side filter capacitor C1, the low-pressure side filter inductance L2's is another
One end is connected with the emitter stage of transistor S1 and the colelctor electrode of transistor S2 respectively, the other end of the low-pressure side filter inductance L3
Be connected with transistor S3 emitter stages and transistor S4 colelctor electrodes respectively, the other end of the low-pressure side filter inductance L4 respectively with crystalline substance
Body pipe S5 emitter stages and transistor S6 colelctor electrodes are connected, and the low-pressure side equivalent source VL voltages negative terminal is filtered with low-pressure side respectively
The other end of electric capacity C1, the emitter stage of transistor S2, the emitter stage of transistor S4, the emitter stage of transistor S6, high-pressure side filtering
The other end of electric capacity C2 and high-pressure side equivalent source VH voltages negative terminal connection.
Further, phase shift current sharing control module also includes that the first Postponement module 7, the second Postponement module 8 and the 3rd postpone
Module 9, the first triangular modulation module 4 is connected with transistor S1 and transistor S2 respectively by the first Postponement module 7, institute
State the second triangular modulation module 5 to be connected with transistor S3 and transistor S4 respectively by the second Postponement module 8, the described 3rd 3
Angle ripple modulation module 6 is connected with transistor S5 and transistor S6 respectively by the 3rd Postponement module 9.
A kind of control method of the control device of two-way DC converter based on LCL filter that the present invention is provided, tool
Body is comprised the following steps：
Step 1：Second voltage sensor measurement low-pressure side filter capacitor in low-pressure side dispatch from foreign news agency pressure ring Isobarically Control module
The both end voltage v of C1L, the 6th comparison module 14 is by voltage vLThe low-pressure side voltage definite value v given with top level control deviceLrefThan difference,
Obtain difference △ vL, the 3rd pi controller PI3 is to difference △ vLProportional plus integral control is carried out, the reference of extrinsic current ring is obtained
Value iL1ref, supplying control model selecting module 12 carries out model selection；In the dispatch from foreign news agency pressure ring Isobarically Control module of high-pressure side first
The both end voltage v of voltage sensor measurement high-pressure side filter capacitor C2H, the 5th comparison module 13 is by voltage vHWith top level control device
Given high side voltage definite value vHrefThan difference, difference △ v are obtainedH, the second pi controller PI2 is to difference △ vHCarry out
Proportional plus integral control, obtains extrinsic current ring reference value iL1ref, supplying control model selecting module 12 carries out model selection；Control on upper strata
The extrinsic current ring reference value i that device processed is directly specifiedL1refAnd supply control model selecting module 12 and carry out model selection；
Step 2：Control model selecting module 12 is the control model selecting module 12 of one-out-three, control model selecting module
12 control models that two-way DC converter is selected according to the control instruction of top level control device, and by low-pressure side dispatch from foreign news agency pressure ring constant pressure
The extrinsic current ring reference value i of control module outputL1ref, the output of high-pressure side dispatch from foreign news agency pressure ring Isobarically Control module the reference of extrinsic current ring
Value iL1refThe extrinsic current ring reference value i directly specified with top level control deviceL1refIn thrin as iL1refIt is supplied to active
Damping control module；
Step 3:The electric current i of the 4th current sensor measurement low-pressure side filter inductance L1 in active damping control moduleL1,
4th comparison module 11 is by electric current iL1Extrinsic current ring reference value i selected with control model selecting module 12L1refThan difference, obtain
To difference △ iL1, the first pi controller PI1 is to difference △ iL1Proportional plus integral control, obtains control variables ic1, trapper
The resonance spikes of three-phase crisscross parallel LCL filter are compensated module Gn and lag network module Gc is to three-phase crisscross parallel
The Parameters variation that LCL filter occurs carries out redundancy compensation, the signal i after being compensatedc1 *, signal ic1 *By flowing proportional die
The first comparison module 1 that block 10 is respectively in phase shift current sharing control module provides current reference value iL2ref, be the second comparison module 2
Current reference value i is providedL3refBe that the 3rd comparison module 3 provides current reference value iL4ref；
Step 4：The electric current i of the first current sensor measurement low-pressure side filter inductance L2 in phase shift current sharing control moduleL2,
The electric current i of the second current sensor measurement low-pressure side filter inductance L3L3, the 3rd current sensor measurement low-pressure side filter inductance L4
Electric current iL4, the first comparison module 1 is by electric current iL2With current reference value iL2refThan difference, difference △ i are obtainedL2, the second comparison module
2 by electric current iL3With current reference value iL3refThan difference, difference △ i are obtainedL3, the 3rd comparison module 3 is by electric current iL4With current reference value
iL4refThan difference, difference △ i are obtainedL4, the first proportional controller P1 is to difference △ iL2The ratio of carrying out control, obtains controlled quentity controlled variable vc2, the
Two proportional controller P2 are to difference △ iL3The ratio of carrying out control, obtains controlled quentity controlled variable vc3, the 3rd proportional controller P3 is to difference △ iL4
The ratio of carrying out control, obtains controlled quentity controlled variable vc4, controlled quentity controlled variable vc2Dutycycle is obtained for d by the first triangular modulation module 41Driving
Pulse, controlled quentity controlled variable vc3Dutycycle is obtained for d by the second triangular modulation module 52Driving pulse, controlled quentity controlled variable vc4By the 3rd
Triangular modulation module 6 obtains dutycycle for d3Driving pulse, dutycycle is d1Driving pulse pass through the first Postponement module 7
The switch of controlling transistor S1 and transistor S2 afterwards, dutycycle is d2Driving pulse it is brilliant by controlling after the second Postponement module 8
The switch of body pipe S3 and transistor S4, dutycycle is d3Driving pulse by controlling transistor S5 after the 3rd Postponement module 9 and
The switch of transistor S6.
Further, the transistor S1, transistor S2, transistor S3, transistor S4, transistor S5 and transistor S6 are equal
It is insulated gate bipolar transistor IGBT.
Further, the transmission function of the trapper module Gn in the active damping control module is：
Wherein, ωnFor trapper characteristic angular frequency (corresponding characteristic frequency be fn), Q is the quality factor of trapper,
The characteristic frequency fnValue it is equal with the resonant frequency of three-phase crisscross parallel LCL filter.
Further, the transmission function of the lag network module Gc in the active damping control module is：
Wherein, b is the indexing coefficient (b of lag network<1), T is time constant (the corresponding handing-over frequency of lag network), the handing-over frequency fTValue be taken as trapper characteristic frequency fn1/10th, indexing coefficient b values be characterized frequency
Rate fnTen times.
Further, the control model selecting module can be by selecting extrinsic current ring reference value iL1refCalculation makes
Two-way DC converter works in three kinds of different working conditions, and three kinds of working conditions are respectively high side voltage constant pressure control
System, low-pressure side voltage Isobarically Control and input and output electric current current constant control.
The operation principle of the embodiment of the present invention is：
As shown in figure 1, the two-way DC converter based on LCL filter is two-way its essence is three single-phase LCL filters
The equivalent crisscross parallel of DC converter is formed.When being without active damping network without active damping control module, as shown in Fig. 2
The extrinsic current ring open-loop transfer function of two-way DC converter causes two-way straight due to there is resonance peak containing LCL filter
Current converter unstability, the resonance peak at resonant frequency of this control method by trapper module to LCL filter is mended
Resonant frequency can be moved when repaying, and considering LCL filter parameter change, therefore using lag network module to certain limit
The resonant frequency movement that interior Parameters variation causes is compensated, by above-mentioned compensation, as shown in figure 3, two-way DC converter
It is good by active damping network rear stability.
The embodiment of the present invention is emulated below.
Simulation parameter is：Low-pressure side terminal voltage vLIt is set as 140V, high-pressure side terminal voltage vHIt is set as 700V, specified input
Current settings are 60A, and rated power is 8.4kW.So as to the electric current for flowing through three-phase crisscross parallel switching tube is 20A.Setting is flowed through
The electric current peak-peak ripple of three-phase crisscross parallel switching tube is 40A, and switching frequency is 10kHz, is computed obtaining inductance L2=L3=L4
=280uH.Inductance L1 current equivalences switching frequency is flowed through for 30kHz, set flow through the electric current peak-peak ripple of inductance L1 as
0.15A, is computed obtaining inductance L1=5uH, electric capacity C1=600uF.In view of the ripple of output voltage, output filter capacitor C2=
256uF。
By taking the Isobarically Control of high-pressure side as an example, i.e., control model selecting module selects high-pressure side dispatch from foreign news agency pressure ring Isobarically Control module
The extrinsic current ring reference value i of outputL1ref, two-way DC converter starts in 0s, during 0s to 0.1s, high-pressure side terminal voltage vHFor
700V, two-way DC converter works in standby mode；During 0.1s to 0.2s, high-pressure side terminal voltage vH710V is increased to, it is two-way
DC converter works in Buck patterns；During 0.2s to 0.3s, high side power voltage drops to 690V, bidirectional, dc current transformer
Work in Boost patterns.
The both end voltage v of the described high-pressure side filter capacitor C2 in the present embodimentHAs high-pressure side terminal voltage vH, low pressure
The both end voltage v of side filter capacitor C1LAs low-pressure side terminal voltage vL, Fig. 4 show two-way DC converter high-pressure side terminal voltage
vHWaveform, as can be seen from the figure converter high-pressure side output voltage vHStabilization is in 700V constant-pressure operations, and dynamic and static state performance is good.
Fig. 5 flows through the electric current i on the low-pressure side filter inductance L2 of two-way DC converter when showing Isobarically ControlL2, low-pressure side filtering
I on inductance L3L3With the i on low-pressure side filter inductance L4L4Waveform, it can be seen that three-phase current sharing control imitate
Fruit is good.Fig. 6 flows through the electric current i on the low-pressure side filter inductance L2 of two-way DC converter when being Isobarically ControlL2, low-pressure side filter
I on ripple inductance L3L3With the i on low-pressure side filter inductance L4L4Waveform after crisscross parallel, it can be seen that three-phase electricity
Stream phase shifting control works well.Fig. 7 flows through the electric current i on low-pressure side filter inductance L1 when being Isobarically ControlL1Waveform, from figure
Its stability it is strong and dynamic and static state performance is good.Extrinsic current ring of the invention is using series trap module to LCL filter
Spike resonance is compensated, while lag network module of connecting ensures that converter remains unchanged when LCL filter parameter changes
Keep stabilization.
The present invention for based on LCL filter two-way DC converter exist the equal flow problem of three-phase current phase shift and
LCL filter resonance peak problem, designs a kind of multiple feedback loop strategy, and the phase shift of three-phase current is realized by three interior electric current loops
Sharing control, an extrinsic current ring realizes that LCL filter active damping is controlled, and a dispatch from foreign news agency pressure ring realizes two-way DC converter
The voltage of determining of high-pressure side or low-pressure side is controlled.Wherein, extrinsic current ring is humorous to the spike of LCL filter using series trap module
Shake and compensate, while lag network module of connecting ensures that converter remains unchanged holding surely when LCL filter parameter changes
It is fixed.Control method proposed by the invention both can guarantee that converter long-term safety stable operation, converter can again obtain good
Static and dynamic performance, and be easily achieved, be highly suitable to be applied for the control of LCL filter three-phase staggered bi-directional DC converter.
Protection scope of the present invention includes but is not limited to embodiment of above, and protection scope of the present invention is with claims
Be defined, any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, improvement each fall within it is of the invention
Protection domain.
Claims (8)
1. a kind of control device of the two-way DC converter based on LCL filter, it is characterised in that：Including bidirectional, dc conversion
Device, phase shift current sharing control module, active damping control module, control model selecting module, high-pressure side dispatch from foreign news agency pressure ring Isobarically Control
Module and low-pressure side dispatch from foreign news agency pressure ring Isobarically Control module；
Described two-way DC converter includes low-pressure side equivalent source VL, three-phase crisscross parallel the LCL filtering being sequentially connected electrically
Device, three-phase crisscross parallel switching tube, high-pressure side filter capacitor C2 and high-pressure side equivalent source VH, the three-phase crisscross parallel LCL
Wave filter includes low-pressure side filter inductance L1, low-pressure side filter inductance L2, low-pressure side filter inductance L3, low-pressure side filter inductance L4
With low-pressure side filter capacitor C1；
The phase shift current sharing control module includes the first current sensor, the second current sensor, the 3rd current sensor, first
Comparison module, the second comparison module, the 3rd comparison module, the first proportional controller, the second proportional controller, the control of the 3rd ratio
Device, the first triangular modulation module, the second triangular modulation module and the 3rd triangular modulation module, first current sense
Device, the first comparison module, the first proportional controller and the first triangular modulation module are sequentially connected in series, second current sense
Device, the second comparison module, the second proportional controller and the second triangular modulation module are sequentially connected in series, the 3rd current sense
Device, the 3rd comparison module, the 3rd proportional controller and the 3rd triangular modulation module are sequentially connected in series, first triangular modulation
Module, the second triangular modulation module and the 3rd triangular modulation module are connected with three-phase crisscross parallel switching tube respectively, described
First current sensor is used to measure the electric current of low-pressure side filter inductance L2, and second current sensor is used to measure low-pressure side
The electric current of filter inductance L3, the 3rd current sensor is used to measure the electric current of low-pressure side filter inductance L4；
The active damping control module include the 4th current sensor, the 4th comparison module, the first pi controller, fall into
Ripple device module, lag network module and flow ratio module, the 4th current sensor, the 4th comparison module, the first ratio
Integral controller, trapper module, lag network module and stream ratio module are sequentially connected in series, the stream ratio module difference
It is connected with the first comparison module, the second comparison module and the 3rd comparison module, the 4th current sensor is used to measure low pressure
The electric current of side filter inductance L1；
The control model selecting module is connected with top level control device；
The high-pressure side dispatch from foreign news agency pressure ring Isobarically Control module includes first voltage sensor, the 5th comparison module and the second ratio product
Sub-controller, the first voltage sensor, the 5th comparison module and the second pi controller are sequentially connected in series, and described second
Pi controller is connected with the control model selecting module, and the 5th comparison module is connected with top level control device, institute
First voltage sensor is stated for measuring the both end voltage of high-pressure side filter capacitor C2；
The low-pressure side dispatch from foreign news agency pressure ring Isobarically Control module includes second voltage sensor, the 6th comparison module and the 3rd ratio product
Sub-controller, the second voltage sensor, the 6th comparison module and the 3rd pi controller are sequentially connected in series, and the described 3rd
Pi controller is connected with the control model selecting module, and the 6th comparison module is connected with top level control device, institute
Second voltage sensor is stated for measuring the both end voltage of low-pressure side filter capacitor C1.
2. the control device of the two-way DC converter based on LCL filter according to claim 1, it is characterised in that：
The three-phase crisscross parallel switching tube includes transistor S1, transistor S2, transistor S3, transistor with anti-paralleled diode
The collector terminal of S4, transistor S5 and transistor S6, the transistor S1, transistor S3 and transistor S5 is filtered with high-pressure side
One end of electric capacity C2 and high-pressure side equivalent source VH positive voltage terminals.
3. the control device of the two-way DC converter based on LCL filter according to claim 2, it is characterised in that：
One end of the low-pressure side filter inductance L1 is connected with low-pressure side equivalent source VL positive voltage terminals, the low-pressure side filter inductance L1
Other end one end, one end of low-pressure side filter inductance L3, low-pressure side filter inductance L4 respectively with low-pressure side filter inductance L2
One end and pressure side filter capacitor C1 one end connection, the other end of the low-pressure side filter inductance L2 is respectively with transistor S1's
The colelctor electrode connection of emitter stage and transistor S2, the other end of the low-pressure side filter inductance L3 respectively with transistor S3 emitter stages
With the connection of transistor S4 colelctor electrodes, the other end of the low-pressure side filter inductance L4 respectively with transistor S5 emitter stages and transistor
S6 colelctor electrodes are connected, the low-pressure side equivalent source VL voltages negative terminal other end, crystal respectively with low-pressure side filter capacitor C1
The emitter stage of pipe S2, the emitter stage of transistor S4, the emitter stage of transistor S6, the other end of high-pressure side filter capacitor C2 and high pressure
Side equivalent source VH voltages negative terminal connection.
4. the control device of the two-way DC converter based on LCL filter according to claim 2, it is characterised in that：
The phase shift current sharing control module also includes the first Postponement module, the second Postponement module and the 3rd Postponement module, the described 1st
Angle ripple modulation module is connected with transistor S1 and transistor S2 respectively by the first Postponement module, the second triangular modulation mould
Block is connected with transistor S3 and transistor S4 respectively by the second Postponement module, and the 3rd triangular modulation module passes through the 3rd
Postponement module is connected with transistor S5 and transistor S6 respectively.
5. a kind of control method of the control device of the two-way DC converter based on LCL filter as claimed in claim 4,
It is characterized in that：Specifically include following steps：
Step 1：Second voltage sensor in low-pressure side dispatch from foreign news agency pressure ring Isobarically Control module measures low-pressure side filter capacitor C1's
Both end voltage vL, the 6th comparison module is by voltage vLThe low-pressure side voltage definite value v given with top level control deviceLrefIt is poor than difference
Value △ vL, the 3rd pi controller is to difference △ vLProportional plus integral control is carried out, extrinsic current ring reference value i is obtainedL1ref, supply
Give control model selecting module；First voltage sensor measurement high-pressure side filtering in the dispatch from foreign news agency pressure ring Isobarically Control module of high-pressure side
The both end voltage v of electric capacity C2H, the 5th comparison module is by voltage vHThe high side voltage definite value v given with top level control deviceHrefThan
Difference, obtains difference △ vH, the second pi controller is to difference △ vHProportional plus integral control is carried out, the reference of extrinsic current ring is obtained
Value iL1ref, supply control model selecting module；The extrinsic current ring reference value i that top level control device is directly specifiedL1refAnd supply control
Mode selection module；
Step 2：Control model selecting module is the control model selecting module of one-out-three, and control model selecting module is according to upper strata
The control instruction of controller selects the control model of two-way DC converter, and low-pressure side dispatch from foreign news agency pressure ring Isobarically Control module is defeated
The extrinsic current ring reference value i for going outL1ref, the output of high-pressure side dispatch from foreign news agency pressure ring Isobarically Control module extrinsic current ring reference value iL1refWith
The extrinsic current ring reference value i that top level control device is directly specifiedL1refIn thrin as iL1refIt is supplied to active damping control
Module；
Step 3:The electric current i of the 4th current sensor measurement low-pressure side filter inductance L1 in active damping control moduleL1, the 4th
Comparison module is by electric current iL1Extrinsic current ring reference value i selected with control model selecting moduleL1refThan difference, difference △ is obtained
iL1, the first pi controller is to difference △ iL1Proportional plus integral control, obtains control variables ic1, trapper module is to three-phase
The resonance spikes of crisscross parallel LCL filter are compensated and lag network module occurs to three-phase crisscross parallel LCL filter
Parameters variation carry out redundancy compensation, the signal i after being compensatedc1 *, signal ic1 *By flowing the respectively phase shift of ratio module
The first comparison module in current sharing control module provides current reference value iL2ref, provide current reference value for the second comparison module
iL3refWith provide current reference value i for the 3rd comparison moduleL4ref；
Step 4：The electric current i of the first current sensor measurement low-pressure side filter inductance L2 in the phase shift current sharing control moduleL2,
The electric current i of the second current sensor measurement low-pressure side filter inductance L3L3, the 3rd current sensor measurement low-pressure side filter inductance L4
Electric current iL4, the first comparison module is by electric current iL2With current reference value iL2refThan difference, difference △ i are obtainedL2, the second comparison module
By electric current iL3With current reference value iL3refThan difference, difference △ i are obtainedL3, the 3rd comparison module is by electric current iL4With current reference value
iL4refThan difference, difference △ i are obtainedL4, the first proportional controller is to difference △ iL2The ratio of carrying out control, obtains controlled quentity controlled variable vc2, second
Proportional controller is to difference △ iL3The ratio of carrying out control, obtains controlled quentity controlled variable vc3, the 3rd proportional controller is to difference △ iL4Compared
Example control, obtains controlled quentity controlled variable vc4, controlled quentity controlled variable vc2Dutycycle is obtained for d by the first triangular modulation module1Driving pulse, control
Amount v processedc3Dutycycle is obtained for d by the second triangular modulation module2Driving pulse, controlled quentity controlled variable vc4Adjusted by the 3rd triangular wave
Molding block obtains dutycycle for d3Driving pulse, dutycycle is d1Driving pulse by controlling crystal after the first Postponement module
The switch of pipe S1 and transistor S2, dutycycle is d2Driving pulse by controlling transistor S3 and crystal after the second Postponement module
The switch of pipe S4, dutycycle is d3Driving pulse opened by controlling transistor S5 and transistor S6 after the 3rd Postponement module
Close.
6. the control method of the control device of the two-way DC converter based on LCL filter according to claim 5, its
It is characterised by：The transistor S1, transistor S2, transistor S3, transistor S4, transistor S5 and transistor S6 are insulated gate
Bipolar transistor IGBT.
7. the control method of the control device of the two-way DC converter based on LCL filter according to claim 5, its
It is characterised by：The transmission function of the trapper module in the active damping control module is：
Wherein, ωnFor trapper characteristic angular frequency (corresponding characteristic frequency be fn), Q is the quality factor of trapper, described
Characteristic frequency fnValue it is equal with the resonant frequency of three-phase crisscross parallel LCL filter.
8. the control method of the control device of the two-way DC converter based on LCL filter according to claim 5, its
It is characterised by：The transmission function of the lag network module in the active damping control module is：
Wherein, b is the indexing coefficient (b of lag network<1), T is time constant (the corresponding handing-over frequency of lag network
), the handing-over frequency fTValue be taken as trapper characteristic frequency fn1/10th, indexing coefficient b values be characterized frequency fn's
Ten times.
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| CN108521150A (en) * | 2018-04-19 | 2018-09-11 | 西安交通大学 | A kind of multifunctional storage battery charge and discharge device and its control method |
| CN112865521A (en) * | 2021-04-13 | 2021-05-28 | 浙江大学 | Active damping control method and system for constant-power load system of Buck converter |
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