CN105391303B - A kind of rectangular wave modulator approach of modularization isolated form battery energy storage converter - Google Patents

A kind of rectangular wave modulator approach of modularization isolated form battery energy storage converter Download PDF

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CN105391303B
CN105391303B CN201510786660.1A CN201510786660A CN105391303B CN 105391303 B CN105391303 B CN 105391303B CN 201510786660 A CN201510786660 A CN 201510786660A CN 105391303 B CN105391303 B CN 105391303B
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arm
voltage
transformer
bridge arm
bridge
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CN105391303A (en
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李睿
李新培
陈强
蔡旭
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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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
    • H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
    • 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
    • H02M3/33561—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 more than one ouput with independent control

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The present invention discloses a kind of rectangular wave modulator approach of modularization isolated form battery energy storage converter, the method makes transformer primary secondary alternating voltage duty cycle in half of switch periods be less than 0.5, energy transmission direction and size between energy-storage battery and DC grid are controlled by adjusting the phase difference between primary side square-wave voltage and secondary square-wave voltage, it is poor by phase calibration, the each submodule dc-link capacitance voltage of stabilizing transformer secondary side bridge arm, transformer secondary side current average is adjusted by adjusting all submodule output voltage DC components of transformer secondary side 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

A kind of rectangular wave modulator approach of modularization isolated form battery energy storage converter
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 rectangular wave modulation strategy 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 rectangular wave modulator approach, i.e. transformer primary secondary alternating voltage duty cycle in half of switch periods is small In 0.5, and by adjusting the phase difference of transformer primary secondary high frequency rectangular wave voltage, realize between energy-storage battery and DC grid The bi-directional of energy, in addition, by corresponding control strategy, realizes the reliable and stable operation of system.
The present invention provides a kind of rectangular 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、 Bridge arm Arm_s1 is connected with DC grid busbar anode, the secondary side other end of transformer and the cathode phase of DC grid busbar Even；Bridge arm Arm_s1 is made of n sub- block coupled in series, and each submodule direct current side joint dc-link capacitance, forms secondary bridge arm Each module of Arm_s1 uses full bridge structure or half-bridge structure；
The transformer primary side alternating voltage positive-negative half-cycle rectangular wave duty cycle is less than 0.5, i.e. primary side bridge arm Arm_p1 is every A H bridges output voltage duty cycle in half of switch periods is less than 0.5, does not have phase difference, primary side bridge arm Arm_ between each H bridges Each H bridges of p1 can export three kinds of states (- 1,0,1), and the scope of transformer primary side square-wave voltage is-m~m；
Since DC grid exists, DC component is near after all submodule output AC voltage superpositions of secondary bridge arm Arm_s1 Like being DC grid voltage vdc, i.e. transformer secondary side alternating voltage is symmetrical on vdc, and transformer secondary side alternating voltage On the symmetrical positive-negative half-cycle rectangular wave duty cycle D of vdcpLess than 0.5, i.e. each submodules of secondary bridge arm Arm_s1 are opened at half Close output voltage duty cycle D in the cyclesLess than 0.5, there is no phase difference, D between each submodulepWith DsIt is equal or unequal；When When each submodules of secondary bridge arm Arm_s1 use full bridge structure, secondary bridge arm Arm_s1 output square-wave voltage scope be-n~ n；Each half-bridge can only export two states (0,1), when each modules of secondary bridge arm Arm_s1 use half-bridge structure, secondary bridge Arm Arm_s1 output square-wave voltage scopes are 0~n；
To realize the Two-way energy transfer between energy-storage battery and DC grid, deposited between transformer primary secondary rectangular wave In phase differenceThe present invention makes transformer primary secondary alternating voltage duty cycle in half of switch periods be less than 0.5, passes through adjusting Phase difference between primary side square-wave voltage and secondary square-wave voltage controls the energy between energy-storage battery and DC grid to pass Direction and size are passed, stabilizing transformer secondary side bridge arm each submodule dc-link capacitance voltage poor by phase calibration, leads to All submodule output voltage DC components of transformer secondary side bridge arm are overregulated to adjust transformer secondary side current average, That is DC distribution current on line side, so as to achieve the purpose that stable module voltage and control grid-connected current, realizes that system is reliable and stable Operation.
Preferably, the method adjusts transformation by controlling all submodule DC bus-bar voltages of secondary bridge arm Arm_s1 The phase difference of device original secondary rectangular waveThat is the rated value of Arm_s1 modules DC bus-bar voltage and all module direct currents of Arm_s1 Input of the deviation of busbar voltage average as pi regulator, the output of pi regulator is as 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 rectangular 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. 3 with control strategy suitable for converter topology are based on direct current The rectangular 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 rectangular wave modulation principle figure of one embodiment of the invention；
Fig. 3 is being averaged for the isolated form modular multilevel energy storage converter based on DC grid of one embodiment of the invention Equivalent circuit diagram；
Fig. 4 is the control figure of the bridge arm Arm_s1 modules dc-link capacitance electric voltage equalizations of one embodiment of the invention；
Fig. 5 is the bridge arm Arm_s1 output voltage DC component modulated signal generating principle figures of one embodiment of the invention.
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, in one embodiment of the invention modularization isolated form battery energy storage converter circuit topology, wherein： Transformer primary side bridge arm Arm_p1 is composed in series by m H bridge, the direct current side joint energy-storage battery of each H bridges, transformer primary side bridge arm Arm_p1 passes through a filter inductance LpConnect transformer primary side；
Each H bridges of isolating transformer primary side bridge arm Arm_p1 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 electricity Stream.Primary side filter inductance is Lp, primary current iLp, transformer voltage ratio 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；Transformer secondary bridge arm Arm_s1 is by n Submodule is connected, either half-bridge structure can also be full bridge structure, each submodule is denoted as each submodule topology cells1_j(1≤j≤n), cells1_jDirect current side joint capacitance, capacitance voltage are denoted as vs1_j_dc(1≤j≤n), cells1_jExchange end Output is denoted as vs1_j_ac(1≤j≤n), is1_j_dc(1≤j≤n) 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 iLs.DC grid busbar voltage is vdc, electric current is idc。
Due to using modularized design, even if the voltage class of each module can still reach higher voltage than relatively low Grade, so as to fulfill low-loss, low cost, high switching frequency.
Based on said structure, the transformer primary side alternating voltage positive-negative half-cycle rectangular wave duty cycle DpIt is less than 0.5, i.e., former The each modules of side Arm_p1 output voltage duty cycle D in half of switch periodspLess than 0.5, there is no phase between modules Difference, since each energy-storage modules of Arm_p1 use H bridge structures, each H bridges can export three kinds of states (- 1,0,1), so transformation The scope of device primary side square-wave voltage is-m~m.Since DC grid exists, all module output exchanges of secondary bridge arm Arm_s1 DC component is approximately DC grid voltage v after voltage superpositiondc, i.e., transformer secondary side alternating voltage is on vdcSymmetrically, and become Depressor secondary side alternating voltage is on vdcSymmetrical positive-negative half-cycle rectangular wave duty cycle DsLess than 0.5, i.e. primary side Arm_s1 is each Module output voltage duty cycle D in half of switch periodssLess than 0.5, there is no phase difference, D between modulespWith DsBoth may be used With it is equal can not also be equal.The each submodules of Arm_s1 can use half-bridge structure or use full bridge structure, when When each modules of Arm_s1 use full bridge structure, Arm_s1 output square-wave voltage scopes are-n~n, due to each half-bridge only To export two states (0,1), so when each modules of Arm_s1 use half-bridge structure, Arm_s1 output square-wave voltage models It is 0~n to enclose.
It is the isolated form modular multilevel energy storage converter based on DC grid in one embodiment of the invention shown in Fig. 2 Rectangular wave modulation principle：There is no phase difference between all H bridges outputs of primary side bridge arm Arm_p1, stack result is Symmetrical Rectangular wave ripple vp1, half of switch periods of note are Ts, in (0~DpTs) in the time, vp1For just, in (DpTs~Ts) in the time, vp1For 0, in (Ts~(1+Dp)Ts)) in the time, vp1It is negative, in ((1+Dp)Ts~2Ts) in the time, vp1For 0.Remember phase differenceWith respect to π Ratio be Then existIn time, vs1Output 0,Time It is interior, vs1Output is more than vdc,In time, vs1Output 0, In time, vs1Output is less than vdc,In time, vs1Output 0.Primary side side alternating current iLpTo be positive and negative Symmetrical cyclically-varying curve, i.e. iLpDC component is 0, secondary side alternating current iLsInclude DC component (iLs(avs)) right Claim, iLs(avs)As DC grid electric current idc, i.e. iLsFor on idcSymmetrical cyclically-varying curve.
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 rectangular 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 isolated form modular multilevel energy storage converter of one embodiment of the invention kind based on DC grid shown in Fig. 5 Arm_s1 output voltage DC component modulated signals vs1_dcGenerating principle figure：Secondary current iLsBy low-pass filter LF with DC grid current rating idc* the input as pi regulator, output and the DC grid voltage v of pi regulator are addeddc's Deviation is as vs1_dcModulated signal.I is controlled by correcting secondary bridge arm Arm_s1 output voltages DC componentLs。
In conclusion present embodiments provide a kind of isolated form modular multilevel energy storage converter rectangular wave modulation plan Slightly, this method requires transformer primary secondary voltage duty cycle in half of switch periods to be less than 0.5, and former secondary rectangular wave it Between there are phase difference to realize energy exchange between energy-storage battery and DC grid, stabilizing transformer pair poor by phase calibration The each submodule dc-link capacitance voltage of avris bridge arm, by adjusting all submodule output voltages of transformer secondary side bridge arm DC 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 (4)

  1. A kind of 1. rectangular 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 transformer primary side alternating voltage positive-negative half-cycle rectangular wave duty cycle DpLess than 0.5, i.e. each H of primary side bridge arm Arm_p1 Bridge output voltage duty cycle D in half of switch periodspIt is equal and respectively less than 0.5, i.e., there is no phase difference between each H bridges, it is former Each H bridges of side bridge arm Arm_p1 can export three kinds of states i.e. -1,0,1, the scope of transformer primary side square-wave voltage be-m~ m；
    Since DC grid exists, DC component is approximately after all submodule output AC voltage superpositions of secondary bridge arm Arm_s1 DC grid voltage vdc, i.e., transformer secondary side alternating voltage is on vdcSymmetrically, and transformer secondary side alternating voltage is on vdc Symmetrical positive-negative half-cycle rectangular wave duty cycle DsLess than 0.5, i.e. each submodules of secondary bridge arm Arm_s1 are in half of switch periods Interior output voltage duty cycle DsLess than 0.5, there is no phase difference, D between each submodulepWith DsIt is equal or unequal；When secondary bridge When each submodules of arm Arm_s1 use full bridge structure, secondary bridge arm Arm_s1 output square-wave voltage scopes are-n~n；Each Half-bridge can only export two states i.e. 0,1, when each modules of secondary bridge arm Arm_s1 use half-bridge structure, secondary bridge arm Arm_ S1 output square-wave voltage scopes are 0~n；
    To realize the Two-way energy transfer between energy-storage battery and DC grid, there are phase between transformer primary secondary rectangular wave Potential differenceThe method makes transformer primary secondary alternating voltage duty cycle in half of switch periods be less than 0.5, former by adjusting Phase difference between side square-wave voltage and secondary square-wave voltageTo control energy transmission between energy-storage battery and DC grid Direction and size, poor by phase calibration, each submodule dc-link capacitance voltage of stabilizing transformer secondary side bridge arm, passes through Adjust transformer secondary all submodule output voltage DC components of side bridge arm to adjust transformer secondary side current average, i.e., DC distribution current on line side, so as to achieve the purpose that stable module voltage and control grid-connected current, realizes the reliable and stable fortune of system OK.
  2. 2. the rectangular wave modulator approach of modularization isolated form battery energy storage converter according to claim 1, its feature exist In the method adjusts transformer primary secondary rectangle by controlling all submodule DC bus-bar voltages of secondary bridge arm Arm_s1 The phase difference of rippleThat is the rated value of all submodule DC bus-bar voltages of secondary bridge arm Arm_s1 and secondary bridge arm Arm_s1 institutes There is input of the deviation of submodule DC bus-bar voltage average as pi regulator, the output of pi regulator is as phase difference
  3. 3. the rectangular wave modulator approach of modularization isolated form battery energy storage converter according to claim 1, its feature exist In transformer secondary side current average is divided by correcting the direct current of all submodule output voltages of secondary bridge arm Arm_s1 Measure to adjust, i.e. transformer secondary side current iLsAfter low-pass filter LF filtering work is added with the set-point of DC grid electric current For the input of pi regulator, output and the DC grid busbar voltage v of pi regulatordcDeviation is as secondary bridge arm Arm_s1 direct currents Voltage modulation signal vs1_dc。
  4. 4. according to the rectangular wave modulator approach of claim 1-3 any one of them modularization isolated form battery energy storage converters, It is characterized in that, the method adjusts transformer primary by controlling all submodule DC bus-bar voltages of secondary bridge arm Arm_s1 The phase difference of secondary rectangular waveThat is the rated value of all submodule DC bus-bar voltages of Arm_s1 and all submodules of Arm_s1 Input of the deviation of DC bus-bar voltage average as pi regulator, the output of pi regulator is as phase difference
    Transformer secondary side current average is by correcting the direct currents of all submodule output voltages of secondary bridge arm Arm_s1 Component is adjusted, i.e. transformer secondary side current iLsIt is added after low-pass filter LF filtering with the set-point of DC grid electric current As the input of pi regulator, output and the DC grid busbar voltage v of pi regulatordcDeviation is straight as secondary bridge arm Arm_s1 Flow voltage modulation signal vs1_dc；
    Modulate and control by above-mentioned rectangular wave, converter direct current net side DC current idcIt can realize accurately control, and The converter can realize active power filtering and current-limiting function.
CN201510786660.1A 2015-11-16 2015-11-16 A kind of rectangular wave modulator approach of modularization isolated form battery energy storage converter Active CN105391303B (en)

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CN102355040A (en) * 2011-10-19 2012-02-15 北京四方继保自动化股份有限公司 Converter modular design and control method matched with battery grouping application
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
CN103580050A (en) * 2013-11-11 2014-02-12 国家电网公司 High-power modularization multi-level lithium battery energy storage converter device

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Publication number Priority date Publication date Assignee Title
CN101860228A (en) * 2010-05-07 2010-10-13 中国科学院电工研究所 Power electronic transformer for high voltage distribution
CN102355040A (en) * 2011-10-19 2012-02-15 北京四方继保自动化股份有限公司 Converter modular design and control method matched with battery grouping application
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
CN103580050A (en) * 2013-11-11 2014-02-12 国家电网公司 High-power modularization multi-level lithium battery energy storage converter device

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