CN105356756A - Quasi-square wave modulation method for modularized isolation type battery energy storage converter - Google Patents
Quasi-square wave modulation method for modularized isolation type battery energy storage converter Download PDFInfo
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- CN105356756A CN105356756A CN201510785384.7A CN201510785384A CN105356756A CN 105356756 A CN105356756 A CN 105356756A CN 201510785384 A CN201510785384 A CN 201510785384A CN 105356756 A CN105356756 A CN 105356756A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a quasi-square wave modulation method for a modularized isolation type battery energy storage converter. Primary and secondary side AC voltage of a transformer is not a standard quasi-square wave, and the rising edge and the falling edge are step-shaped, i.e. duty ratio of AC output voltage of all the H-bridges of a primary side bridge arm Arm_p1 and all the submodules of a secondary side bridge arm Arm_s1 is less than or equal to 0.5 and is not equal to each other. The energy transfer direction and size of an energy storage battery and a DC power gird are controlled by adjusting phase difference between primary side quasi-square wave voltage and secondary side quasi-square wave voltage. DC bus capacitance voltage of all the submodules of the secondary side bridge arm of the transformer is stabilized by correcting the phase difference. The secondary side average current value, i.e. DC power distribution network side current, of the transformer is adjusted by adjusting the output voltage DC components of all the submodules of the secondary side bridge arm of the transformer so that the objective of stabilizing module voltage and controlling grid-connected current can be achieved, and system stable and reliable operation can be realized.
Description
Technical field
The present invention relates to technical field of electric automation equipment, particularly, relate to a kind of quasi-square wave modulator approach of modularization isolated form battery energy storage converter.
Background technology
The various aspects of battery energy storage system in electric power system, especially in load balancing, the user side quality of power supply, reactive power compensation and hold the key areas such as regenerative resource in occupation of the position become more and more important.And due to the cost of its special role and costliness, the reliability of battery energy storage system is held the balance.
Module multi-level converter (MMC) due to output voltage higher grade, and extensibility and Redundant Control capacity are large, are widely used in DC distribution net.By isolated form modular multilevel energy storage converter applications in DC distribution net, transformer primary avris connects energy storage cascade H-bridge circuit by a filter inductance, transformer secondary side winding connects DC distribution net by filter inductance and secondary brachium pontis, transformer secondary brachium pontis is formed by n sub-block coupled in series, the direct current side joint dc-link capacitance of each module.
But, owing to being applied to the particularity of the isolated form modular multilevel energy storage transformer configuration of mesohigh DC distribution net, need corresponding modulation and control strategy to ensure the reliable and stable operation of system.
Summary of the invention
For the defect of prior art, the object of the invention is for the isolated form modular multilevel energy storage converter based on direct current network provides a kind of quasi-square wave modulator approach, transformer primary side alternating voltage is not quasi-square wave, but quasi-square wave, namely former quasi-square wave rising edge and trailing edge are stairstepping, phase difference is there is between each submodule output AC voltage, and by regulating the phase difference of transformer primary secondary high frequency quasi-square wave voltage, realize the bi-directional of energy between energy-storage battery and direct current network, in addition, by corresponding control strategy, realize system stability reliability service.
The invention provides a kind of quasi-square wave modulator approach of isolated form modular multilevel energy storage converter, described modularization isolated form battery energy storage converter topology structure is: transformer primary side is by a filter inductance L
pconnect the output of former limit brachium pontis Arm_p1, transformer primary side brachium pontis Arm_p1 is formed by the cascade of m H bridge, the output of the series connection of m H bridge as the output of former limit brachium pontis Arm_p1, the direct current side joint energy-storage battery of each H bridge; One end, secondary side of transformer is by a filter inductance L
s, secondary brachium pontis Arm_s1 is connected with direct current network bus negative pole, the secondary side other end of transformer is connected with the positive pole of direct current network bus; Secondary brachium pontis Arm_s1 is made up of n sub-block coupled in series, each submodule direct current side joint dc-link capacitance, and each module forming secondary brachium pontis Arm_s1 adopts full bridge structure or half-bridge structure;
Described former each H bridge of limit brachium pontis Arm_p1 can export three kinds of states (-1,0,1), and the scope of transformer primary side quasi-square wave voltage is-m ~ m; When each submodule of secondary brachium pontis Arm_s1 adopts full bridge structure, it is-n ~ n that secondary brachium pontis Arm_s1 exports quasi-square wave voltage range; Each half-bridge can only export two states (0,1), and when each module of Arm_s1 adopts half-bridge structure, it is 0 ~ n that Arm_s1 exports quasi-square wave voltage range;
Described transformer primary secondary alternating voltage is not the quasi-square wave of standard, but rising edge and trailing edge present stair-stepping quasi-square wave, namely former each H bridge of limit brachium pontis Arm_p1, secondary brachium pontis Arm_s1 each submodule ac output voltage duty ratio are all less than or equal to 0.5 and unequal mutually;
Described converter is the Two-way energy transfer realized between energy-storage battery and direct current network, needs to there is phase difference between transformer primary secondary quasi-square wave
described method controls energy transferring direction and size between energy-storage battery and direct current network by regulating the phase difference between former limit quasi-square wave voltage and secondary quasi-square wave voltage, poor by phase calibration, each submodule dc-link capacitance voltage of stabilizing transformer secondary brachium pontis, transformer secondary side current average is regulated by regulating transformer secondary brachium pontis all submodule output voltages DC component, i.e. DC distribution current on line side, thus reach the object of stable module voltage and control grid-connected current, realize system stability reliability service.
Preferably, described transformer primary side alternating voltage is not quasi-square wave, but quasi-square wave, namely former quasi-square wave rising edge and trailing edge are stairstepping, there is phase difference between each H bridge output AC voltage of former limit brachium pontis, the duty ratio of each H bridge output AC voltage of former limit brachium pontis Arm_p1 in half switch periods is descending is designated as D successively
p1_1~ D
p1_m(0.4≤D
p1_i≤ 0.5,1≤i≤m), D
p1_iwith D
p1_i+1between (1≤i≤m), difference is identical or not identical; In order to improve alternating voltage effective value, D
p1_i(1≤i≤m) is as far as possible close to 0.5.Described former limit brachium pontis Arm_p1 adopts H bridge tandem type structure, and transformer primary side side alternating voltage is the quasi-square wave of Symmetrical.
Preferably, described secondary brachium pontis Arm_s1 each submodule duty ratio is descending is designated as D successively
s1_1~ D
s1_n(0.4≤D
s1_j≤ 0.5,1≤j≤n), D
s1_iwith D
s1_i+1between (1≤j≤n), difference is identical or not identical, but in order to improve alternating voltage effective value, D
s1_j(1≤j≤n) should as far as possible close to 0.5.Because secondary direct current network exists, stablize to maintain each H bridge voltage of secondary brachium pontis Arm_s1, transformer secondary alternating voltage is about direct current network v
dcsymmetrical quasi-square wave.
Preferably, described method can regulate the phase difference of transformer primary secondary quasi-square wave by controlling all submodule DC bus-bar voltage of secondary brachium pontis Arm_s1
namely the rated value of secondary brachium pontis Arm_s1 all submodules DC bus-bar voltage and the deviation of secondary brachium pontis Arm_s1 all module DC bus-bar voltage average are as the input of pi regulator, and the output of pi regulator is as phase difference
Preferably, described transformer secondary side current average is regulated by the DC component correcting all submodule output voltages of secondary brachium pontis Arm_s1, i.e. transformer secondary side current i
lsthe input as pi regulator is added with the set-point of direct current network electric current, the output of pi regulator and direct current network busbar voltage v after low pass filter LF filtering
dcdeviation is as secondary brachium pontis Arm_s1 direct voltage modulation signal v
s1_dc.
Compared with prior art, the present invention has following beneficial effect:
The quasi-square wave modulation strategy of isolated form modular multilevel energy storage variator of the present invention, the energy exchange between energy-storage battery and direct current network can be realized, and realizing the balanced and Circuit Fault on Secondary Transformer Current adjustment of module voltage by certain control strategy, this modulation and control strategy are applicable to the quasi-square wave that converter topology can be equivalent to all isolated form modular multilevel energy storage converters based on DC distribution net of the averaging model of Fig. 4 and modulate.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
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 the average equivalent circuit diagram based on the isolated form modular multilevel energy storage converter of direct current network in one embodiment of the invention;
Fig. 4 is the control chart of the Arm_s1 modules dc-link capacitance electric voltage equalization of one embodiment of the invention;
Fig. 5 is that the Arm_s1 output voltage DC component modulation signal of one embodiment of the invention generates.
Embodiment
Below in conjunction with specific embodiment, the present invention will be described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, this all belongs to protection scope of the present invention.
As shown in Figure 1, be the circuit topology of the isolated form modular multilevel energy storage converter based on direct current network of one embodiment of the invention: transformer primary side is by a filter inductance L
pconnect the output of former limit brachium pontis Arm_p1, transformer primary side brachium pontis Arm_p1 is formed by the cascade of m H bridge, the output of the series connection of m H bridge as the output of former limit brachium pontis Arm_p1, the direct current side joint energy-storage battery of each H bridge; Isolating transformer former limit brachium pontis Arm_p1 is formed by the cascade of m H bridge, and each H bridge is designated as cell
p1_i(1≤i≤m), cell
p1_idirect current side joint energy-storage battery, cell
p1_idC side cell voltage is designated as v
p1_i_dc(1≤i≤m), cell
p1_iexchange end output and be designated as v
p1_i_ac(1≤i≤m), i
p1_i_dc(1≤i≤m) is cell
p1_idC side electric current, i
p1_i_ac(1≤i≤m) is cell
p1_ioutlet side electric current.Former limit filter inductance is L
p, primary current is i
lp, transformer voltage ratio is 1:N.
One end, secondary side of transformer is by a filter inductance L
s, secondary brachium pontis Arm_s1 is connected with direct current network bus negative pole, the secondary side other end of transformer is connected with the positive pole of direct current network bus; Secondary brachium pontis Arm_s1 is made up of n sub-block coupled in series, each submodule direct current side joint dc-link capacitance, and each module topology of formation secondary brachium pontis Arm_s1 both can be half-bridge structure also can be full bridge structure, and each submodule is designated as cell
s1_j(1≤j≤n), cell
s1_jdirect current side joint electric capacity, capacitance voltage is designated as v
s1_j_dc(1≤j≤n), cell
s1_jexchange end output and be designated as v
s1_j_ac(1≤j≤n), i
s1_j_dc(1≤j≤n) is cell
s1_jdC side electric current, i
s1_j_ac(1≤j≤n) is cell
s1_joutlet side electric current.Secondary filter inductance is L
s, secondary current is i
ls.Direct current network busbar voltage is v
dc, electric current is i
dc.
Described former limit each energy-storage module of brachium pontis Arm_p1 adopts H bridge construction, and each H bridge can export three kinds of states (-1,0,1), so the scope of transformer primary side quasi-square wave voltage is-m ~ m.When each submodule of secondary brachium pontis Arm_s1 adopts full bridge structure, it is-n ~ n that secondary brachium pontis Arm_s1 exports quasi-square wave voltage range, because each half-bridge is only to export two states (0,1), so when each submodule of secondary brachium pontis Arm_s1 adopts half-bridge structure, it is 0 ~ n that secondary brachium pontis Arm_s1 exports quasi-square wave voltage range.
Due to adopt modularized design, even if each module electric pressure lower, still can reach higher electric pressure, thus realize low-loss, low cost, high switching frequency.
Described transformer primary side alternating voltage is not quasi-square wave, but quasi-square wave, namely former quasi-square wave rising edge and trailing edge are stairstepping, there is phase difference between each submodule output AC voltage; The duty ratio of each H bridge output AC voltage of former limit brachium pontis Arm_p1 in half switch periods is descending is designated as D successively
p1_1~ D
p1_m(0.4≤D
p1_i≤ 0.5,1≤i≤m), D
p1_iwith D
p1_i+1between (1≤i≤m) difference can identical also can not be identical, but in order to improve alternating voltage effective value, D
p1_i(1≤i≤m) should as far as possible close to 0.5.Because Arm_p1 adopts H bridge tandem type structure, therefore transformer primary side side alternating voltage is the quasi-square wave of Symmetrical.Secondary brachium pontis Arm_s1 each submodule duty ratio is descending is designated as D successively
s1_1~ D
s1_n(0.4≤D
s1_j≤ 0.5,1≤j≤n), D
p1_jwith D
p1_j+1between (1≤j≤n) difference can identical also can not be identical, but in order to improve alternating voltage effective value, D
s1_j(1≤j≤n) should as far as possible close to 0.5, and because secondary direct current network exists, stablize to maintain each H bridge voltage of secondary brachium pontis Arm_p1, transformer secondary alternating voltage is about direct current network v
dcsymmetrical quasi-square wave.
As shown in Figure 2, be the quasi-square wave modulation principle of the isolated form modular multilevel energy storage converter based on direct current network of one embodiment of the invention kind, primary voltage of transformer v
p1symmetrical, rising edge and trailing edge stepped, namely there is phase difference between former limit brachium pontis Arm_p1 each H bridge output voltage.Transformer secondary voltage v
s1lag behind primary voltage of transformer v
p1phase difference
v
s1rising edge and trailing edge stepped, transformer secondary is due to direct current network v
dcexistence, in order to make system stable operation, v
s1about v
dcsymmetrical.
Shown in Fig. 3, it is the average equivalent circuit diagram of modularization isolated form battery energy storage converter in one embodiment of the invention.The averaging model of converter can be equivalent to: former limit AC is equivalent to transformer primary side winding, filter inductance L
pwith a controlled voltage source v
p1(Arm_p1 output equivalent is v
p1) series loop, DC energy storage side is equivalent to energy-storage battery v
arm_p1_dcconnect a controlled current source d
p1i
lp; Secondary AC is equivalent to vice-side winding, filter inductance L
s, controlled voltage source v
s1(Arm_s1 output equivalent is v
s1), direct current network v
dcseries loop, module DC side is equivalent to v
arm_s1_dcconnect a controlled current source d
s1i
ls, all module DC side equivalent capacitys of Arm_s1 are Cs/n, and this capacitor equivalent voltage is v
arm_s1_dc, i
lsfor secondary transformer side electric current, i
dcfor direct current current on line side.
V
arm_p1_dcfor former limit brachium pontis Arm_p1 all H bridge batteries voltage sum, d
p1for the equivalent duty ratio sum of former limit brachium pontis Arm_p1 all H bridge, v
p1for former limit brachium pontis Arm_p1 output voltage, both comprised DC component and also comprised alternating current component.V
arm_s1_dcfor secondary brachium pontis Arm_s1 all submodule DC capacitor voltages sum, d
s1for the equivalent duty ratio sum of all submodules of secondary brachium pontis Arm_s1, v
s1for secondary brachium pontis Arm_s1 output voltage, both comprised DC component and also comprised alternating current component.V
dcfor direct current network voltage.
According to the averaging model of above-mentioned converter, the phase difference of transformer primary secondary quasi-square wave can be regulated by all submodule DC bus-bar voltage of control Arm_s1
namely the rated value of Arm_s1 all modules DC bus-bar voltage and the deviation of Arm_s1 all module DC bus-bar voltage average are as the input of pi regulator, and the output of pi regulator is as phase difference
Shown in Fig. 4, be the control chart of the brachium pontis Arm_s1 modules dc-link capacitance electric voltage equalization of one embodiment of the invention, V
arms1_dc* secondary brachium pontis Arm_s1 each submodule DC capacitor voltage rated value is represented, v
arms1_dcrepresent secondary brachium pontis Arm_s1 all submodule DC capacitor voltages mean value, V
arms1_dc* with v
arms1_dcdeviation through pi regulator correct after as phase difference
namely by phase calibration difference, each submodule DC capacitor voltage of secondary brachium pontis Arm_s1 is stabilized near rated value.
Shown in Fig. 5, be the secondary brachium pontis Arm_s1 output voltage DC component modulation signal v based on the isolated form modular multilevel energy storage converter of direct current network in one embodiment of the invention
s1_dcgenerating principle figure: secondary current i
lsby low pass filter LF and direct current network current rating i
dc* the input as pi regulator is added, the output of pi regulator and direct current network voltage v
dcdeviation as v
s1_dcmodulation signal.Namely by correcting secondary brachium pontis Arm_s1 output voltage DC component control i
ls.
Through above-mentioned quasi-square wave modulation and control strategy, this converter direct current network side direct current i
dccan realize controlling accurately, and this converter can realize active power filtering and current-limiting function.
The invention provides a kind of isolated form modular multilevel energy storage converter quasi-square wave modulation strategy, the transformer primary secondary alternating voltage of the method is not the quasi-square wave of standard, but rising edge and trailing edge present stepped, namely the inner each submodule ac output voltage duty ratio of former avris (secondary side) brachium pontis is all less than or equal to 0.5 and unequal mutually, and there is the energy exchange that phase difference realizes between energy-storage battery and direct current network between former secondary quasi-square wave, poor by phase calibration, each submodule dc-link capacitance voltage of stabilizing transformer secondary side brachium pontis, transformer secondary side current average is regulated by regulating transformer secondary side brachium pontis all submodule output voltages DC component, thus realize system stability reliability service.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (7)
1. the quasi-square wave modulator approach of a modularization isolated form battery energy storage converter, it is characterized in that, described modularization isolated form battery energy storage converter topology structure is: transformer primary side brachium pontis Arm_p1 is composed in series by m H bridge, the direct current side joint energy-storage battery of each H bridge, transformer primary side brachium pontis Arm_p1 is by a filter inductance L
pconnect transformer primary side; One end, secondary side of transformer is by a filter inductance L
s, secondary brachium pontis Arm_s1 is connected with direct current network bus negative pole, the secondary side other end of transformer is connected with the positive pole of direct current network bus; Secondary brachium pontis Arm_s1 is made up of n sub-block coupled in series, each submodule direct current side joint dc-link capacitance, and each module forming secondary brachium pontis Arm_s1 is full bridge structure or half-bridge structure;
Described former each H bridge of limit brachium pontis Arm_p1 can export three kinds of states (-1,0,1), and the scope of transformer primary side quasi-square wave voltage is-m ~ m; When each submodule of secondary brachium pontis Arm_s1 adopts full bridge structure, it is-n ~ n that secondary brachium pontis Arm_s1 exports quasi-square wave voltage range; Each half-bridge can only export two states (0,1), and when each module of Arm_s1 adopts half-bridge structure, it is 0 ~ n that Arm_s1 exports quasi-square wave voltage range;
Described transformer primary secondary alternating voltage is not the quasi-square wave of standard, but rising edge and trailing edge present stair-stepping quasi-square wave, namely former each H bridge of limit brachium pontis Arm_p1, secondary brachium pontis Arm_s1 each submodule ac output voltage duty ratio are all less than or equal to 0.5 and unequal mutually;
Described converter is the Two-way energy transfer realized between energy-storage battery and direct current network, needs to there is phase difference between transformer primary secondary quasi-square wave
described method controls energy transferring direction and size between energy-storage battery and direct current network by regulating the phase difference between former limit quasi-square wave voltage and secondary quasi-square wave voltage, poor by phase calibration, each submodule dc-link capacitance voltage of stabilizing transformer secondary brachium pontis, transformer secondary side current average is regulated by regulating transformer secondary brachium pontis all submodule output voltages DC component, i.e. DC distribution current on line side, thus reach the object of stable module voltage and control grid-connected current, realize system stability reliability service.
2. the quasi-square wave modulator approach of modularization isolated form battery energy storage converter according to claim 1, it is characterized in that, there is phase difference between each submodule output AC voltage of described transformer primary side brachium pontis, the duty ratio of Arm_p1 modules output AC voltage in half switch periods is descending is designated as D successively
p1_1~ D
p1_m(0.4≤D
p1_i≤ 0.5,1≤i≤m), D
p1_iwith D
p1_i+1between (1≤i≤m), difference is identical or not identical; In order to improve alternating voltage effective value, D
p1_i(1≤i≤m) is as far as possible close to 0.5.
3. the quasi-square wave modulator approach of modularization isolated form battery energy storage converter according to claim 2, is characterized in that, described former limit brachium pontis Arm_p1 adopts H bridge tandem type structure, and transformer primary side side alternating voltage is the quasi-square wave of Symmetrical.
4. the quasi-square wave modulator approach of modularization isolated form battery energy storage converter according to claim 1, is characterized in that, described secondary brachium pontis Arm_s1 each submodule duty ratio is descending is designated as D successively
s1_1~ D
s1_n(0.4≤D
s1_j≤ 0.5,1≤j≤n), D
s1_jwith D
s1_j+1between (1≤j≤n), difference is identical or not identical, but in order to improve alternating voltage effective value, D
s1_j(1≤j≤n) should as far as possible close to 0.5.
5. the quasi-square wave modulator approach of modularization isolated form battery energy storage converter according to claim 4, it is characterized in that, because secondary direct current network exists, stablize to maintain each H bridge voltage of secondary brachium pontis Arm_s1, transformer secondary alternating voltage is about direct current network v
dcsymmetrical quasi-square wave.
6. the quasi-square wave modulator approach of the modularization isolated form battery energy storage converter according to any one of claim 1-5, it is characterized in that, described method can regulate the phase difference of transformer primary secondary quasi-square wave by controlling all module DC bus-bar voltage of secondary brachium pontis Arm_s1
namely the rated value of secondary brachium pontis Arm_s1 all submodules DC bus-bar voltage and the deviation of secondary brachium pontis Arm_s1 all submodule DC bus-bar voltage average are as the input of pi regulator, and the output of pi regulator is as phase difference
7. the quasi-square wave modulator approach of the modularization isolated form battery energy storage converter according to any one of claim 1-5, it is characterized in that, described transformer secondary side current average is regulated by the DC component correcting all submodule output voltages of secondary brachium pontis Arm_s1, i.e. transformer secondary side current i
lsthe input as pi regulator is added with the set-point of direct current network electric current, the output of pi regulator and direct current network busbar voltage v after low pass filter LF filtering
dcdeviation is as secondary brachium pontis Arm_s1 direct voltage modulation signal v
s1_dc.
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| 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 |
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