CN105703651B - Gird-connected inverter parallel system and control method - Google Patents
Gird-connected inverter parallel system and control method Download PDFInfo
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- CN105703651B CN105703651B CN201610139503.6A CN201610139503A CN105703651B CN 105703651 B CN105703651 B CN 105703651B CN 201610139503 A CN201610139503 A CN 201610139503A CN 105703651 B CN105703651 B CN 105703651B
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
-
- 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
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to scale technical field of new energy power generation, it is desirable to provide a kind of gird-connected inverter parallel system and control method.The control method includes each H bridges grid-connected inverter direct current bus voltage difference dispelling tactics and drive signal synchronization policy；DC bus-bar voltage difference is eliminated to be realized by controlling each DC-DC converter, and adjuster, voltage regulator and current regulator are pressed for being arranged in the three close-loop control system of each DC-DC；Drive signal synchronization policy is realized by the way that level-one drive signal time delay process is arranged before the driving circuit of each H bridges gird-connected inverter.The present invention overcomes each DC bus-bar voltage in the prior art is inconsistent and each inconsistent defect for causing instantaneous circulation of inversion unit driving signal of power switching tube, each parallel units can be enable uniformly to share total grid-connected current closer to ideal non-loop operation state.
Description
Technical field
The present invention relates to scale technical field of new energy power generation more particularly to a kind of gird-connected inverter parallel system and controls
Method processed.
Background technology
Large capacity gird-connected inverter can be used for photovoltaic generation, wind-power electricity generation, static reactive generator, active power filtering
Device etc..Due to being limited by power electronic devices power grade, single power device tends not to meet high current application
Demand, and parallel technology can make up the limited disadvantage of power semiconductor current-carrying capability well.Parallel technology mainly has at present
Device level is in parallel, line level parallel connection is in parallel with Unit Level.Point of the device in C-V characteristic, service time, recovery charge etc.
Scattered property can influence current balance when their direct parallel connections, to solve the problems, such as static state when device parallel connection and dynamic current equalizing, need
Certain measure is taken in the apolegamy of characteristic, the triggering of grid (door) pole, flow equalizing circuit etc..Line level parallel connection refers to each parallel connection
Parallel connection is carried out after the current-limiting reactor of bridge arm midpoint again, this parallel way is simple in structure, but reactor volume, weight, cost
It is higher.Controller is integrated into each parallel units by Unit Level parallel connection together, and the flexibility of system is very high, is conducive to carry out simple group
It closes, is the mainstream selection applied to large capacity grid-connected inverter system.
For gird-connected inverter parallel system, since the DC bus of each gird-connected inverter unit is independent from each other, if
Each DC bus-bar voltage is inconsistent, and the PWM voltages of each inverter output must differ, so as to cause between each parallel units
Higher hamonic wave circulation, this higher hamonic wave circulation existing for this parallel system on the one hand so that grid-connected current waveform is distorted,
On the other hand it will produce additional loss again；If in addition, control strategy be each unit generate voltage modulation signal independently of each other,
Different, due to being had differences between voltage modulation signal, this will lead to the power switch tube drives that each inversion unit generates
Signal is inconsistent, therefore inherently there is circulation between parallel units.
Invention content
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide a kind of gird-connected inverter
Parallel system and its control method enable each parallel units uniformly to share grid-connected current.
To solve technical problem, solution of the invention is：
A kind of gird-connected inverter parallel system is provided, including n parallel units, two in parallel units outlet side are public
A public filter capacitor C is bridged between sys node A and B；Be additionally provided with a public filter inductance L, one end with it is public simultaneously
Interlink point B is connected, and the other end is then connected with power grid；
For parallel units i, i=1,2...n：It is grid-connected including a high-frequency isolation full-bridge DC-DC converter and a H bridge
Inverter；The input terminal bridging voltage value of DC-DC converter i is EiDC power supply or capacitance；By two pole of band inverse parallel afterflow
The full control switching tube K of pipei1, Ki2, Ki3With Ki4H bridge topologys are constituted, this H bridges input side is E with voltage valueiDC power supply or electricity
Hold and is connected, outlet side and high frequency transformer TiPrimary side is connected；By four power diode Di1, Di2, Di3With Di4Rectifier bridge is constituted,
Rectifier bridge input side and high frequency transformer TiSecondary side is connected, and rectifier bridge outlet side is bridged by filter inductance LfiWith filter capacitor CfiStructure
At low-pass filter；The input voltage of H bridge gird-connected inverters i by DC-DC converter i output filter capacitor CfiBoth end voltage
It provides；By the full control switching tube S with inverse parallel fly-wheel diodei1, Si2, Si3With Si4Constitute H bridge gird-connected inverters i topologys, this H
Bridge input side and filter capacitor CfiBoth ends be connected, two exit points of H bridges respectively with filter inductance Li1, Li2One end be connected, filter
Wave inductance Li1The other end is connected with terminal A, filter inductance Li2The other end is connected with terminal B.
Invention further provides the gird-connected inverter control method for parallel based on aforementioned system, wherein becomes to DC-DC
The operation control of parallel operation i includes the following steps：
(1) the output voltage V of sampling DC-DC converter iiWith flow through filter inductance LfiElectric current ii；
(2) after finding out DC-DC converter output total voltage, average output voltage V is calculated；
(3) output voltage of average output voltage V and DC-DC converter i is used as pressure adjuster G after making differenceViIt is defeated
Enter；
(4) pressure adjuster GViOutput be added with given DC voltage and then with output voltage ViMake the knot after difference
Fruit is as voltage regulator GDiInput；
(5) voltage regulator GDiOutput and filter inductance difference between currents as current regulator GIiInput；
(6) current regulator GIiOutput and triangular carrier relatively obtain DC-DC converter i and control switching tube K entirelyi1, Ki2,
Ki3With Ki4Drive signal.
Invention further provides the gird-connected inverter control method for parallel based on aforementioned system, wherein to H in system
The operation control of bridge gird-connected inverter i includes the following steps：
(1) the phase V of power grid is detectedg/|Vg| and the grid-connected current i in public filter inductance Lg；
(2) grid-connected current amplitude given value IgrefWith grid phase Vg/|Vg| it is multiplied, obtains the instantaneous given of grid-connected current
Value igref；
(3) by igref-igAs grid-connected current adjuster GgInput；
(4)GgOutput and triangular carrier relatively obtain controlling entirely in each H bridges gird-connected inverter switching tube it is not optimized after
Drive signal S1, S2, S3With S4；
(5) according to the transmission speed v of transmission medium and transmission range Li, it is grid-connected to measure the H bridges before being not added with time delay process
Transmission time t of the inverter i drive signals from controller to driving circuiti, ti=Li/v；
(6) t is selectediIn maximum of T；
(7) the delay time d needed for H bridge gird-connected inverter i drive signals is calculatedi, di=T-ti；
(8) H bridge gird-connected inverter i are directed to, four digital shift units are built in FPGA, according to the clock of numerical shift device
Frequency Clock and delay time di, calculate the digit N of numerical shift devicei, NiFor [di/ Clock] integer part；
(9) by S1, S2, S3With S4Respectively as the input of four digital shift units, the output of four digital shift units is through passing
Defeated medium enters driving circuit and obtains controlling switching tube S entirelyi1, Si2, Si3With Si4Drive signal after optimization.
In the present invention, synchronous control is needed to each DC-DC converter and each H bridges gird-connected inverter；Also, each H bridges are grid-connected inverse
The DC bus-bar voltage difference dispelling tactics for becoming device synchronous should be carried out with drive signal synchronization policy.
In the present invention, for pressure adjuster, voltage regulator and the electric current tune being arranged in DC-DC converter control system
Device, grid-connected current adjuster are saved, pi regulator is all used.
In the present invention, the circuit element parameter used in each parallel units is consistent as far as possible.
The realization principle description of the present invention：
It is E that DC-DC converter input terminal, which bridges voltage value,iDC power supply or capacitance, by H bridges topology by input direct-current
Voltage transformation is the PWM voltages of variable duty ratio, then utilizes high frequency transformer to adjust the amplitude of PWM voltages, and then pass through two
PWM voltage transformations are DC voltage by pole pipe bridge rectifier, finally obtain steady dc voltage by LC low-pass filters；H
Bridge gird-connected inverter input voltage is provided by the output DC voltage of DC-DC converter, by H bridges by input direct-current voltage transformation
For PWM voltages, two endpoints that H bridges are drawn are connected with two filter inductances respectively, the other end and system of two filter inductances
Public sys node is connected, and realizes output.
Compared with prior art, the beneficial effects of the invention are as follows：
The gird-connected inverter parallel system and circulation dispelling tactics of the present invention overcomes each DC bus electricity in the prior art
The inconsistent defect for causing instantaneous circulation of inconsistent and each inversion unit driving signal of power switching tube is pressed, it can be closer to ideal
Non-loop operation state enables each parallel units uniformly to share total grid-connected current.
Description of the drawings：
Fig. 1 gird-connected inverter parallel system main circuit diagrams；
Fig. 2 each unit DC-DC converter drive signals generate block diagram；
Drive signal after Fig. 3 each unit H bridges gird-connected inverters are not optimized generates block diagram；
Drive signal after the optimization of Fig. 4 each unit H bridge gird-connected inverters generates block diagram.
Specific implementation mode
The optimized integration of the present invention is gird-connected inverter parallel system to be based on, including n parallel units.In outlet side
A public filter capacitor C is bridged between two public sys node A and B, the one end public filter inductance L is connected with terminal B, public
The other end of filter inductance L is connected with power grid.For parallel units i (i=1,2...n), including a high-frequency isolation full-bridge DC-
DC converters and a H bridge gird-connected inverter.
It is E that DC-DC converter i input terminals, which bridge voltage value,iDC power supply.By the full control with inverse parallel fly-wheel diode
Switching tube Ki1, Ki2, Ki3With Ki4Constitute H bridge topologys, this H bridges input side and DC power supply EiIt is connected, outlet side and high frequency transformer
TiPrimary side is connected.By four power diode Di1, Di2, Di3With Di4Constitute rectifier bridge, rectifier bridge input side and high frequency transformer Ti
Secondary side is connected, and rectifier bridge outlet side is bridged by filter inductance LfiWith filter capacitor CfiThe low-pass filter of composition.
H bridges gird-connected inverter i input voltages by DC-DC converter i output filter capacitor CfiBoth end voltage provides.By band
The full control switching tube S of inverse parallel fly-wheel diodei1, Si2, Si3With Si4Constitute H bridge topologys, this H bridges input side and filter capacitor Cfi
Both ends be connected, two exit points of H bridges respectively with filter inductance Li1With Li2One end is connected, filter inductance Li1The other end and terminal A
It is connected, filter inductance Li2The other end is connected with terminal B.
The specific work process of DC-DC converter i (i=1,2...n) carries out as follows in the present invention：
1) the output voltage V of sampling DC-DC converter iiWith flow through filter inductance LfiElectric current ii；
2) DC-DC converter output average voltage V is calculated by formula (1)；
3) average output voltage V and DC-DC converter i output voltages ViIt is used as pressure adjuster G after making differenceViInput；
4) [given DC voltage Vref+GViOutput-Vi] it is used as voltage regulator GDiInput；
5)[GDiOutput-ii] it is used as current regulator GIiInput；
6)GIiOutput and triangular carrier relatively obtain controlling switching tube K entirelyi1, Ki2, Ki3With Ki4Drive signal.
The specific work process of H bridges gird-connected inverter i (i=1,2...n) carries out as follows in the present invention：
1) phase (V of power grid is detectedg/|Vg|) with public filter inductance L in grid-connected current ig；
2) the instantaneous given value i of grid-connected currentgrefIt is calculated by formula (2), IgrefFor grid-connected current amplitude given value；
igref=Igref*(Vg/|Vg|) (2)
3)[igref-ig] it is used as grid-connected current adjuster GgInput；
4)GgOutput and triangular carrier relatively obtain controlling entirely in each H bridges gird-connected inverter switching tube it is not optimized after drive
Dynamic signal S1, S2, S3With S4；
5) according to the transmission speed v of transmission medium and transmission range Li, measured before being not added with time delay process by formula (3)
Transmission time t of the H bridge gird-connected inverter i drive signals from controller to driving circuiti；
ti=Li/v (3)
6) t is selectediMaximum of T in (i=1,2...n)；
7) the delay time d needed for formula (4) calculating H bridge gird-connected inverter i drive signals is pressedi；
di=T-ti (4)
8) H bridge gird-connected inverter i are directed to, four digital shift units are built in FPGA, according to the clock of numerical shift device
Frequency Clock and delay time di, calculate the digit N of numerical shift devicei, NiFor [di/ Clock] integer part；
9)S1, S2, S3With S4Respectively as the input of four digital shift units, the output of four digital shift units is through transmission
Medium enters driving circuit and obtains controlling switching tube S entirelyi1, Si2, Si3With Si4Drive signal after optimization.
Below in conjunction with the accompanying drawings and further illustrate the present invention.
Fig. 1 show gird-connected inverter parallel system main circuit diagram, including n parallel units.In two public affairs of outlet side
A public filter capacitor C is bridged between sys node A and B altogether, the one end public filter inductance L is connected with terminal B, public filtered electrical
The other end of sense L is connected with power grid.DC-DC converter i input terminals bridging voltage value is E in parallel units i (i=1,2...n)i
DC power supply.By the full control switching tube K with inverse parallel fly-wheel diodei1, Ki2, Ki3With Ki4Constitute H bridge topologys, the input of this H bridge
Side and DC power supply EiIt is connected, outlet side and high frequency transformer TiPrimary side is connected.By four power diode Di1, Di2, Di3With Di4
Constitute rectifier bridge, rectifier bridge input side and high frequency transformer TiSecondary side is connected, and rectifier bridge outlet side is bridged by filter inductance LfiWith
Filter capacitor CfiThe low-pass filter of composition.H bridges gird-connected inverter i input voltages are by DC-DC converter i's in parallel units i
Output filter capacitor CfiBoth end voltage provides.By the full control switching tube S with inverse parallel fly-wheel diodei1, Si2, Si3With Si4It constitutes
H bridge topologys, this H bridges input side and filter capacitor CfiBoth ends be connected, two exit points of H bridges respectively with filter inductance Li1、Li2One
End is connected, filter inductance Li1The other end is connected with terminal A, filter inductance Li2The other end is connected with terminal B.
Fig. 2 show DC-DC converter i (i=1,2...n) drive signal and generates block diagram, and the specific process that generates is by as follows
Step carries out：1) the output voltage V of each DC-DC converter i is samplediWith flow through filter inductance LfiElectric current ii；2) DC-DC is calculated
Converter exports average voltage V；3) average output voltage V and DC-DC converter i output voltages ViIt is adjusted as pressure after making difference
Device GViInput；4) [given DC voltage Vref+GViOutput-Vi] it is used as voltage regulator GDiInput；5)[GDiIt is defeated
Go out-ii] it is used as current regulator GIiInput；6)GIiOutput and triangular carrier relatively obtain controlling switching tube K entirelyi1, Ki2, Ki3
With Ki4Drive signal.
Fig. 3 show H bridge gird-connected inverter i (i=1,2...n) it is not optimized after drive signal generate block diagram, specifically
Generation process carries out as follows：1) phase (V of power grid is detectedg/|Vg|) with public filter inductance L in grid-connected current ig；
2) the instantaneous given value i of grid-connected current is calculatedgref；3)[igref-ig] it is used as grid-connected current adjuster GgInput；4)GgOutput
Relatively obtain controlling entirely in each H bridges gird-connected inverter with triangular carrier switching tube it is not optimized after drive signal S1, S2, S3With S4。
Fig. 4 show the drive signal after H bridge gird-connected inverter i (i=1,2...n) optimizations and generates block diagram, specific to generate
Process carries out as follows：1) according to the transmission speed v of transmission medium and transmission range Li, calculate and be not added with time delay process
Transmission time t of the preceding H bridges gird-connected inverter i drive signals from controller to driving circuiti；2) t is selectediIn (i=1,2...n)
Maximum of T；3) the delay time d needed for H bridge gird-connected inverter i drive signals is calculatedi；4) H bridge gird-connected inverter i are directed to,
Four digital shift units are built in FPGA, according to the clock rate C lock of numerical shift device and delay time di, calculate number
The digit N of shift uniti, NiFor [di/ Clock] integer part；5)S1, S2, S3With S4Respectively as four digital shift units
Input, the output of four digital shift units enter driving circuit through transmission medium and obtain controlling switching tube S entirelyi1, Si2, Si3With Si4It is excellent
Drive signal after change.
Claims (3)
1. a kind of gird-connected inverter parallel system, including n parallel units, which is characterized in that the two of parallel units outlet side
A public filter capacitor C is bridged between a public sys node A and B；Be additionally provided with a public filter inductance L, one end with
Public sys node B is connected, and the other end is then connected with power grid；
For parallel units i, i=1,2 ... n：Including a high-frequency isolation full-bridge DC-DC converter and a H bridge parallel network reverse
Device；The input terminal bridging voltage value of DC-DC converter i is EiDC power supply or capacitance；By with inverse parallel fly-wheel diode
Full control switching tube Ki1, Ki2, Ki3With Ki4H bridge topologys are constituted, this H bridges input side is E with voltage valueiDC power supply or capacitance phase
Even, outlet side and high frequency transformer TiPrimary side is connected；By four power diode Di1, Di2, Di3With Di4Constitute rectifier bridge, rectification
Bridge input side and high frequency transformer TiSecondary side is connected, and rectifier bridge outlet side is bridged by filter inductance LfiWith filter capacitor CfiIt constitutes
Low-pass filter；The input voltage of H bridge gird-connected inverters i by DC-DC converter i output filter capacitor CfiBoth end voltage carries
For；By the full control switching tube S with inverse parallel fly-wheel diodei1, Si2, Si3With Si4Constitute H bridge gird-connected inverters i topologys, this H bridge
Input side and filter capacitor CfiBoth ends be connected, two exit points of H bridges respectively with filter inductance Li1、Li2One end be connected, filtering
Inductance Li1The other end is connected with public sys node A, filter inductance Li2The other end is connected with public sys node B；
The operation control of DC-DC converter i in the system is included the following steps：
(1) the output voltage V of sampling DC-DC converter iiWith flow through filter inductance LfiElectric current ii；
(2) after finding out DC-DC converter output total voltage, average output voltage V is calculated；
(3) output voltage of average output voltage V and DC-DC converter i is used as pressure adjuster G after making differenceViInput；
(4) pressure adjuster GViOutput be added with given DC voltage and then with output voltage ViMake the result after difference to make
For voltage regulator GDiInput；
(5) voltage regulator GDiOutput and filter inductance difference between currents as current regulator GIiInput；
(6) current regulator GIiOutput and triangular carrier relatively obtain DC-DC converter i and control switching tube K entirelyi1, Ki2, Ki3With
Ki4Drive signal.
2. gird-connected inverter parallel system according to claim 1, which is characterized in that each DC-DC converter and each H bridges
Gird-connected inverter needs synchronous control；Also, the DC bus-bar voltage difference dispelling tactics and drive signal of each H bridges gird-connected inverter
Synchronization policy should synchronize progress.
3. gird-connected inverter parallel system according to claim 1, which is characterized in that control system for DC-DC converter
Pressure adjuster, voltage regulator and the current regulator being arranged in system all use pi regulator.
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| CN107546975B (en) * | 2016-11-07 | 2019-06-28 | 湖南大学 | A kind of isolated form high pressure DC/AC converter and its wide scope Regulation Control method |
| WO2018214082A1 (en) * | 2017-05-25 | 2018-11-29 | 华为技术有限公司 | Apparatus, inverter system, and method for carrier synchronization |
| CN107222090B (en) * | 2017-06-15 | 2019-02-22 | 温州大学 | A kind of parallel operation output power balance control system capturing turn-on time |
| CN107861019B (en) * | 2017-11-23 | 2023-09-05 | 深圳市巴丁微电子有限公司 | H-bridge detection system and detection method |
| CN112134270B (en) * | 2020-09-16 | 2022-05-06 | 水发兴业能源(珠海)有限公司 | Direct current power supply system and control method thereof |
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| FR2999828A1 (en) * | 2013-03-07 | 2014-06-20 | Alstom Technology Ltd | Power converter for managing wide energy power flow in specific range between battery and alternating-current source, has alternating-current filter provided in output of base structures, and control unit controlling base structures |
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