CN105356756B - A kind of quasi-square wave modulator approach of modularization isolated form battery energy storage converter - Google Patents
A kind of quasi-square wave modulator approach of modularization isolated form battery energy storage converter Download PDFInfo
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- CN105356756B CN105356756B CN201510785384.7A CN201510785384A CN105356756B CN 105356756 B CN105356756 B CN 105356756B CN 201510785384 A CN201510785384 A CN 201510785384A CN 105356756 B CN105356756 B CN 105356756B
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
- H02J15/00—Systems for storing electric energy
-
- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
Abstract
The present invention discloses a kind of quasi-square wave modulator approach of modularization isolated form battery energy storage converter,The transformer primary secondary alternating voltage is not the quasi-square wave of standard,But rising edge and trailing edge presentation are stepped,That is each H bridges of primary side bridge arm Arm_p1,Each submodule ac output voltage duty cycles of secondary bridge arm Arm_s1 are respectively less than equal to 0.5 and are not mutually equal,Energy transmission direction and size between energy-storage battery and DC grid are controlled by adjusting the phase difference between primary side quasi-square wave voltage and secondary quasi-square wave voltage,It is poor by phase calibration,The each submodule dc-link capacitance voltage of stabilizing transformer secondary bridge arm,Transformer secondary side current average is adjusted by adjusting all submodule output voltage DC components of transformer secondary bridge arm,That is DC distribution current on line side,So as to achieve the purpose that stable module voltage and control grid-connected current,Realize the reliable and stable operation of system.
Description
Technical field
The present invention relates to technical field of electric automation equipment, and in particular, to a kind of modularization isolated form battery energy storage
The quasi-square wave modulator approach of converter.
Background technology
Various aspects of the battery energy storage system in electric system, especially in balancing the load, user side power quality, nothing
Work(compensates and accommodates the key areas such as regenerative resource in occupation of the position to become more and more important.And due to its special role and costliness
Cost so that the reliability of battery energy storage system is held the balance.
Module multi-level converter (MMC) is since output voltage is higher ranked, and scalability and Redundant Control capacity are big,
It is widely used in DC distribution net.By isolated form modular multilevel energy storage converter applications in DC distribution net, transformation
Device primary side side connects energy storage by a filter inductance and cascades H-bridge circuit, and transformer secondary side winding passes through filter inductance and secondary
Bridge arm connects DC distribution net, and transformer secondary bridge arm is formed by n sub- block coupled in series, the direct current side joint dc bus of each module
Capacitance.
However, the spy due to the isolated form modular multilevel energy storage transformer configuration applied to mesohigh DC distribution net
Different property, it is necessary to modulate with control strategy to ensure the reliable and stable operation of system accordingly.
The content of the invention
The defects of for the prior art, the purpose of the present invention is stored up for the isolated form modular multilevel based on DC grid
Energy converter provides a kind of quasi-square wave modulator approach, and transformer primary side alternating voltage is not square wave, but rising edge and trailing edge
Stair-stepping quasi-square wave is presented, i.e., former square wave rising edge and trailing edge are stepped shape, each submodule output AC voltage it
Between there are phase difference, and by adjusting the phase difference of transformer primary secondary high frequency quasi-square wave voltage, realize energy-storage battery and direct current
The bi-directional of energy between power grid, in addition, by corresponding control strategy, realizes the reliable and stable operation of system.
The present invention provides a kind of quasi-square wave modulator approach of isolated form modular multilevel energy storage converter, the modularization
Isolated form battery energy storage converter topology structure is：Transformer primary side passes through a filter inductance LpConnect primary side bridge arm Arm_p1's
Output terminal, transformer primary side bridge arm Arm_p1 are formed by m H bridges cascade, and the output of the series connection of m H bridge is as primary side bridge arm
The output of Arm_p1, the direct current side joint energy-storage battery of each H bridges；Secondary side one end of transformer passes through a filter inductance Ls、
Secondary bridge arm Arm_s1 is connected with DC grid busbar anode, and the secondary side other end and DC grid busbar of transformer are just
Extremely it is connected；Secondary bridge arm Arm_s1 is made of n sub- block coupled in series, and each submodule direct current side joint dc-link capacitance, is formed
Each module of secondary bridge arm Arm_s1 uses full bridge structure or half-bridge structure；
The each H bridges of primary side bridge arm Arm_p1 can export three kinds of states (- 1,0,1), transformer primary side quasi-square wave voltage
Scope be-m~m；When each submodules of secondary bridge arm Arm_s1 use full bridge structure, secondary bridge arm Arm_s1 outputs quasi- side
Wave voltage scope is-n~n；Each half-bridge can only export two states (0,1), when each modules of Arm_s1 use half-bridge structure
When, Arm_s1 output quasi-square wave voltage ranges are 0~n；
The transformer primary secondary alternating voltage is not the square wave of standard, but rising edge and trailing edge presentation are stair-stepping
The each H bridges of quasi-square wave, i.e. primary side bridge arm Arm_p1, each submodule ac output voltage duty cycles of secondary bridge arm Arm_s1 are respectively less than
Equal to 0.5 and it is not mutually equal；
The converter is to realize Two-way energy transfer between energy-storage battery and DC grid, it is necessary in transformer primary pair
There are phase difference between the quasi-square wave of sideThe method is by adjusting between primary side quasi-square wave voltage and secondary quasi-square wave voltage
Phase difference controls energy transmission direction and size between energy-storage battery and DC grid, poor by phase calibration, stablizes transformation
The each submodule dc-link capacitance voltage of device secondary bridge arm, by adjusting all submodule output voltages of transformer secondary bridge arm
DC component adjusts transformer secondary side current average, i.e. DC distribution current on line side, so as to reach stable module voltage
With the purpose of control grid-connected current, the reliable and stable operation of system is realized.
Preferably, the transformer primary side alternating voltage is not square wave, but rising edge and trailing edge presentation are stair-stepping
Quasi-square wave, i.e., former square wave rising edge and trailing edge are stepped shape, exist between each H bridges output AC voltage of primary side bridge arm
Phase difference, duty cycle of each H bridges output AC voltages of primary side bridge arm Arm_p1 in half of switch periods are descending successively
It is denoted as DP1_1~DP1_m(0.4≤DP1_i≤ 0.5,1≤i≤m), DP1_iWith DP1_i+1Difference is identical between (1≤i≤m) or not phase
Together；In order to improve alternating voltage virtual value, DP1_i(1≤i≤m) is as far as possible close to 0.5.The primary side bridge arm Arm_p1 uses H
Bridge tandem type structure, transformer primary side side alternating voltage are the quasi-square wave of Symmetrical.
Preferably, each submodule duty cycles of secondary bridge arm Arm_s1 are descending is denoted as D successivelys1_1~Ds1_n
(0.4≤Ds1_j≤ 0.5,1≤j≤n), Ds1_iWith Ds1_i+1Difference is identical between (1≤j≤n) or differs, but in order to improve
Alternating voltage virtual value, Ds1_j(1≤j≤n) should try one's best close to 0.5.Since secondary DC grid exists, in order to maintain secondary
The each H bridge voltages of bridge arm Arm_s1 are stablized, and transformer secondary alternating voltage is on DC grid vdcSymmetrical quasi-square wave.
Preferably, the method is by controlling all submodule DC bus-bar voltages of secondary bridge arm Arm_s1 to adjust change
The phase difference of depressor original secondary quasi-square waveThat is the rated value of all submodule DC bus-bar voltages of secondary bridge arm Arm_s1 and pair
Input of the deviation of all module DC bus-bar voltage averages of side bridge arm Arm_s1 as pi regulator, the output of pi regulator are made
For phase difference
Preferably, transformer secondary side current average is exported by correcting all submodules of secondary bridge arm Arm_s1
The DC component of voltage is adjusted, i.e. transformer secondary side current iLsBy low-pass filter LF filtering after with DC grid electric current
Set-point is added the input as pi regulator, output and the DC grid busbar voltage v of pi regulatordcDeviation is as secondary bridge
Arm Arm_s1 DC voltage modulated signals vs1_dc。
Compared with prior art, the present invention has the advantages that：
The quasi-square wave modulation strategy of the isolated form modular multilevel energy storage variator of the present invention, can realize energy-storage battery
Energy exchange between DC grid, and realize that module voltage is balanced and Circuit Fault on Secondary Transformer is electric by certain control strategy
Stream is adjusted, and all of averaging model which can be equivalent to Fig. 4 with control strategy suitable for converter topology are based on direct current
The quasi-square wave modulation of the isolated form modular multilevel energy storage converter of power distribution network.
Brief description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the topological structure of the converter of one embodiment of the invention；
Fig. 2 is the quasi-square wave modulation principle figure of one embodiment of the invention；
Fig. 3 is that isolated form modular multilevel energy storage converter based on DC grid is averaged in one embodiment of the invention
Equivalent circuit diagram；
Fig. 4 is the control figure of the Arm_s1 modules dc-link capacitance electric voltage equalizations of one embodiment of the invention；
Fig. 5 is that the Arm_s1 output voltage DC components modulated signal of one embodiment of the invention generates.
Embodiment
With reference to specific embodiment, the present invention will be described in detail.Following embodiments will be helpful to this area
Technical staff further understands the present invention, but the invention is not limited in any way.It should be pointed out that to the common of this area
For technical staff, without departing from the inventive concept of the premise, various modifications and improvements can be made, this belongs to this hair
Bright protection domain.
As shown in Figure 1, the conversion of the isolated form modular multilevel energy storage based on DC grid for one embodiment of the invention
The circuit topology of device：Transformer primary side passes through a filter inductance LpConnect the output terminal of primary side bridge arm Arm_p1, transformer primary side
Bridge arm Arm_p1 is formed by m H bridges cascade, the output exported as primary side bridge arm Arm_p1 of the series connection of m H bridge, each H bridges
Direct current side joint energy-storage battery；Isolating transformer primary side bridge arm Arm_p1 is formed by m H bridges cascade, and each H bridges are denoted as
cellp1_i(1≤i≤m), cellp1_iDirect current side joint energy-storage battery, cellp1_iDC side cell voltage is denoted as vp1_i_dc(1≤i
≤ m), cellp1_iThe output of exchange end is denoted as vp1_i_ac(1≤i≤m), ip1_i_dc(1≤i≤m) is cellp1_iDC side electric current,
ip1_i_ac(1≤i≤m) is cellp1_iOutlet side electric current.Primary side filter inductance is Lp, primary current iLp, transformer voltage ratio is
1：N.
Secondary side one end of transformer passes through a filter inductance Ls, secondary bridge arm Arm_s1 and DC grid busbar anode
It is connected, the secondary side other end of transformer is connected with the cathode of DC grid busbar；Secondary bridge arm Arm_s1 is by n submodule
It is composed in series, each submodule direct current side joint dc-link capacitance, each module topology for forming secondary bridge arm Arm_s1 both may be used
To be that half-bridge structure can also be full bridge structure, each submodule is denoted as cells1_j(1≤j≤n), cells1_jDirect current side joint electricity
Hold, capacitance voltage is denoted as vs1_j_dc(1≤j≤n), cells1_jThe output of exchange end is denoted as vs1_j_ac(1≤j≤n), is1_j_dc(1≤
J≤n) it is cells1_jDC side electric current, is1_j_ac(1≤j≤n) is cells1_jOutlet side electric current.Secondary filter inductance is Ls,
Secondary current is iLs.DC grid busbar voltage is vdc, electric current idc。
The each energy-storage modules of the primary side bridge arm Arm_p1 use H bridge structures, each H bridges can export three kinds of states (- 1,
0th, 1), so the scope of transformer primary side quasi-square wave voltage is-m~m.When each submodules of secondary bridge arm Arm_s1 use full-bridge
During structure, secondary bridge arm Arm_s1 output quasi-square wave voltage ranges are-n~n, since each half-bridge may only export two states
(0,1), so when each submodules of secondary bridge arm Arm_s1 use half-bridge structure, secondary bridge arm Arm_s1 output quasi-square wave electricity
It is 0~n to press scope.
Due to using modularized design, even if the voltage class of each module can still reach higher electricity than relatively low
Grade is pressed, so as to fulfill low-loss, low cost, high switching frequency.
The transformer primary side alternating voltage is not square wave, but quasi-square wave, i.e., former square wave rising edge and trailing edge are in rank
Trapezoidal shape, there are phase difference between each submodule output AC voltage；The each H bridges output AC voltages of primary side bridge arm Arm_p1
Duty cycle in half of switch periods is descending to be denoted as D successivelyP1_1~DP1_m(0.4≤DP1_i≤ 0.5,1≤i≤m),
DP1_iWith DP1_i+1Between (1≤i≤m) difference can it is identical can not also be identical, but in order to improve alternating voltage virtual value,
DP1_i(1≤i≤m) should try one's best close to 0.5.Since Arm_p1 uses H bridge tandem type structures, therefore transformer primary side top-cross galvanic electricity
Press the quasi-square wave for Symmetrical.The each submodule duty cycles of secondary bridge arm Arm_s1 are descending to be denoted as D successivelys1_1~Ds1_n
(0.4≤Ds1_j≤ 0.5,1≤j≤n), DP1_jWith DP1_j+1Between (1≤j≤n) difference can it is identical can not also be identical, still
In order to improve alternating voltage virtual value, Ds1_j(1≤j≤n) should try one's best close to 0.5, since secondary DC grid exists, in order to
The each H bridge voltages of secondary bridge arm Arm_p1 are maintained to stablize, transformer secondary alternating voltage is on DC grid vdcIt is symmetrical accurate
Square wave.
As shown in Fig. 2, become for the isolated form modular multilevel energy storage based on DC grid of one embodiment of the invention kind
The quasi-square wave modulation principle of parallel operation, primary voltage of transformer vp1Symmetrical, rising edge and trailing edge are stepped, i.e. primary side bridge
There are phase difference between each H bridges output voltages of arm Arm_p1.Transformer secondary voltage vs1Lag behind primary voltage of transformer vp1Phase
Potential differencevs1Rising edge and trailing edge it is stepped, transformer secondary is due to DC grid vdcPresence, in order to make system steady
Fixed operation, vs1On vdcSymmetrically.
It is the average equivalent circuit diagram of modularization isolated form battery energy storage converter in one embodiment of the invention shown in Fig. 3.
The averaging model of converter can be equivalent to：Primary side exchange side is equivalent to transformer primary side winding, filter inductance LpWith one by
Control voltage source vP1(Arm_p1 output equivalents are vP1) series loop, DC energy storage side is equivalent to energy-storage battery varm_p1_dcSeries connection
One controlled current source dp1iLp；Secondary exchange side is equivalent to vice-side winding, filter inductance Ls, controlled voltage source vs1(Arm_s1 is defeated
Go out to be equivalent to vs1), DC grid vdcSeries loop, module DC side is equivalent to varm_s1_dcOne controlled current source of series connection
ds1iLs, all module DC side equivalent capacitys of Arm_s1 are Cs/n, which is varm_s1_dc, iLsBecome for secondary
Depressor side electric current, idcFor direct current current on line side.
varm_p1_dcFor the sum of all H bridge batteries voltages of primary side bridge arm Arm_p1, dp1For all H bridges of primary side bridge arm Arm_p1
The sum of equivalent duty cycle, vp1For primary side bridge arm Arm_p1 output voltages, both comprising DC component or AC compounent had been included.
varm_s1_dcFor the sum of all submodule DC capacitor voltages of secondary bridge arm Arm_s1, ds1For all submodules of secondary bridge arm Arm_s1
The sum of equivalent duty cycle of block, vs1For secondary bridge arm Arm_s1 output voltages, both comprising DC component or AC compounent had been included.
vdcFor DC grid voltage.
According to the averaging model of above-mentioned converter, by controlling all submodule DC bus-bar voltages of Arm_s1 to adjust
The phase difference of transformer primary secondary quasi-square waveThat is the rated value of all module DC bus-bar voltages of Arm_s1 owns with Arm_s1
Input of the deviation of module DC bus-bar voltage average as pi regulator, the output of pi regulator is as phase difference
It is the control of the bridge arm Arm_s1 modules dc-link capacitance electric voltage equalizations of one embodiment of the invention shown in Fig. 4
Drawing, Varms1_dc* each submodule DC capacitor voltage rated values of secondary bridge arm Arm_s1, v are representedarms1_dcRepresent secondary
All submodule DC capacitor voltage average values of bridge arm Arm_s1, Varms1_dc* with varms1_dcDeviation is after pi regulator corrects
As phase differenceI.e. by phase calibration difference by each submodule DC capacitor voltage stabilizations of secondary bridge arm Arm_s1 specified
Near value.
It is the isolated form modular multilevel energy storage converter based on DC grid in one embodiment of the invention shown in Fig. 5
Secondary bridge arm Arm_s1 output voltage DC component modulated signals vs1_dcGenerating principle figure：Secondary current iLsPass through low pass filtered
Ripple device LF and DC grid current rating idc* the input as pi regulator, the output of pi regulator and DC grid are added
Voltage vdcDeviation as vs1_dcModulated signal.Controlled by correcting secondary bridge arm Arm_s1 output voltages DC component
iLs。
By the modulation of above-mentioned quasi-square wave and control strategy, converter direct current net side DC current idcIt is accurate to realize
Control, and the converter can realize active power filtering and current-limiting function.
The present invention provides a kind of isolated form modular multilevel energy storage converter quasi-square wave modulation strategy, the change of this method
Depressor original secondary alternating voltage is not the square wave of standard, but rising edge and trailing edge presentation are stepped, i.e. primary side side (secondary
Side) each submodule ac output voltage duty cycle in bridge arm inside is respectively less than equal to 0.5 and is not mutually equal, and former secondary quasi-square wave
Between there are phase difference to realize energy exchange between energy-storage battery and DC grid, stabilizing transformer poor by phase calibration
The each submodule dc-link capacitance voltage of secondary side bridge arm, electricity is exported by adjusting all submodules of transformer secondary side bridge arm
Straightening flow component adjusts transformer secondary side current average, so as to fulfill the reliable and stable operation of system.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (7)
- A kind of 1. quasi-square wave modulator approach of modularization isolated form battery energy storage converter, it is characterised in that the modularization every Release battery energy storage converter topology structure is：Transformer primary side bridge arm Arm_p1 is composed in series by m H bridge, each H bridges it is straight Side joint energy-storage battery is flowed, transformer primary side bridge arm Arm_p1 passes through a filter inductance LpConnect transformer primary side；The pair of transformer Avris one end passes through a filter inductance Ls, secondary bridge arm Arm_s1 be connected with DC grid busbar anode, the pair of transformer The avris other end is connected with the cathode of DC grid busbar；Secondary bridge arm Arm_s1 is made of n sub- block coupled in series, each submodule Block direct current side joint dc-link capacitance, each module for forming secondary bridge arm Arm_s1 is full bridge structure or half-bridge structure；The each H bridges of primary side bridge arm Arm_p1 can export three kinds of states i.e. -1,0,1, the model of transformer primary side quasi-square wave voltage It is-m~m to enclose；When each submodules of secondary bridge arm Arm_s1 use full bridge structure, secondary bridge arm Arm_s1 output quasi-square wave electricity It is-n~n to press scope；Each half-bridge can only export two states i.e. 0,1, when each modules of Arm_s1 use half-bridge structure, Arm_s1 output quasi-square wave voltage ranges are 0~n；The transformer primary secondary alternating voltage is not square wave, but stair-stepping quasi-square wave is presented with trailing edge in rising edge, i.e., The each H bridges of primary side bridge arm Arm_p1, each submodule ac output voltage duty cycles of secondary bridge arm Arm_s1 be respectively less than equal to 0.5 and It is not mutually equal；The converter is to realize Two-way energy transfer between energy-storage battery and DC grid, it is necessary to accurate in transformer primary secondary There are phase difference between square waveThe method is by adjusting the phase between primary side quasi-square wave voltage and secondary quasi-square wave voltage Difference controls energy transmission direction and size between energy-storage battery and DC grid, stabilizing transformer pair poor by phase calibration The each submodule dc-link capacitance voltage of side bridge arm, by adjusting all submodule output voltage direct currents of transformer secondary bridge arm Component adjusts transformer secondary side current average, i.e. DC distribution current on line side, so as to reach stable module voltage and control The purpose of grid-connected current processed, realizes the reliable and stable operation of system.
- 2. the quasi-square wave modulator approach of modularization isolated form battery energy storage converter according to claim 1, its feature exist In there are phase difference, Arm_p1 modules are defeated between each submodule output AC voltage of the transformer primary side bridge arm Go out that duty cycle of the alternating voltage in half of switch periods is descending to be denoted as D successivelyP1_1~DP1_m, DP1_iWith DP1_i+1Between it is poor It is worth identical or differs；In order to improve alternating voltage virtual value, DP1_iAs far as possible close to 0.5,0.4≤DP1_i≤ 0.5,1≤i≤ m。
- 3. the quasi-square wave modulator approach of modularization isolated form battery energy storage converter according to claim 2, its feature exist In the primary side bridge arm Arm_p1 uses H bridge tandem type structures, and transformer primary side side alternating voltage is the quasi- side of Symmetrical Ripple.
- 4. the quasi-square wave modulator approach of modularization isolated form battery energy storage converter according to claim 1, its feature exist In each submodule duty cycles of secondary bridge arm Arm_s1 are descending to be denoted as D successivelys1_1~Ds1_n, Ds1_jWith Ds1_j+1It Between difference it is identical or differ, but in order to improve alternating voltage virtual value, Ds1_jIt should try one's best close to 0.5,0.4≤Ds1_j≤ 0.5,1≤j≤n.
- 5. the quasi-square wave modulator approach of modularization isolated form battery energy storage converter according to claim 4, its feature exist In, since secondary DC grid exists, in order to maintain each H bridge voltages of secondary bridge arm Arm_s1 to stablize, transformer secondary exchange Voltage is on DC grid vdcSymmetrical quasi-square wave.
- 6. according to the quasi-square wave modulator approach of claim 1-5 any one of them modularization isolated form battery energy storage converters, It is characterized in that, the method is by controlling all module DC bus-bar voltages of secondary bridge arm Arm_s1 to adjust transformer primary The phase difference of secondary quasi-square waveThat is the rated value of all submodule DC bus-bar voltages of secondary bridge arm Arm_s1 and secondary bridge arm Input of the deviation of all submodule DC bus-bar voltage averages of Arm_s1 as pi regulator, the output of pi regulator is as phase Potential difference
- 7. according to the quasi-square wave modulator approach of claim 1-5 any one of them modularization isolated form battery energy storage converters, It is characterized in that, transformer secondary side current average is by correcting all submodule output voltages of secondary bridge arm Arm_s1 DC component adjust, i.e. transformer secondary side current iLsIt is given with DC grid electric current after low-pass filter LF filtering Value is added the input as pi regulator, output and the DC grid busbar voltage v of pi regulatordcDeviation is as secondary bridge arm Arm_s1 DC voltage modulated signals vs1_dc。
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| CN103280977A (en) * | 2013-01-15 | 2013-09-04 | 国网智能电网研究院 | Isolation type DC/DC (direct current/direct current) converter based on modularized multilevel current converter |
| CN103427652A (en) * | 2013-08-01 | 2013-12-04 | 南京南瑞继保电气有限公司 | High-voltage high-power DC-DC conversion device |
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