CN105703651A - Grid-connected inverter parallel system and control method - Google Patents

Grid-connected inverter parallel system and control method Download PDF

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Publication number
CN105703651A
CN105703651A CN201610139503.6A CN201610139503A CN105703651A CN 105703651 A CN105703651 A CN 105703651A CN 201610139503 A CN201610139503 A CN 201610139503A CN 105703651 A CN105703651 A CN 105703651A
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bridge
voltage
converter
combining inverter
grid
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CN105703651B (en
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宋春伟
李梅
郭永洪
孙丽宏
何金龙
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China Jiliang University
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China Jiliang 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
    • 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 invention relates to the technical field of large-scale new energy generation technology and aims to provide a grid-connected inverter parallel system and a control method. The control method comprises the steps of a DC bus voltage difference elimination strategy and a driving signal synchronization strategy for each H-bridge grid-connected inverter. The DC bus voltage difference elimination is realized under the control of each DC-DC converter. For the three-loop control system of each DC-DC converter, the system is provided with a voltage-sharing regulator, a voltage regulator and a current regulator. The driving signal synchronization strategy is realized through a single-stage driving signal delay link before the driving circuit of each H-bridge grid-connected inverter. In this way, the defect in the prior art that the voltages of all DC buses are not consistent with one another and the driving signals of the power switch tubes of all inverter units are not consistent so as to cause the generation of the instantaneous circulation can be overcome. Therefore, the non-circulation running state that is closer to the ideal state is realized. In this way, all parallel units can evenly share the total grid-connected current.

Description

Combining inverter parallel system and control method
Technical field
The present invention relates to scale technical field of new energy power generation, particularly relate to a kind of combining inverter parallel system and control method。
Background technology
Large Copacity combining inverter may be used for photovoltaic generation, wind-power electricity generation, static reacance generator, Active Power Filter-APF etc.。Owing to being subject to the restriction of power electronic devices power grade, single power device tends not to meet the demand of big electric current application, and parallel technology can make up the shortcoming that power semiconductor current capacity is limited well。Current parallel technology mainly has device level parallel connection, line level in parallel in parallel with Unit Level。Device dispersibility in C-V characteristic, service time, recovery charge etc. can affect current balance during they direct parallel connections, for solve device parallel connection time static state and dynamic current equalizing problem, it is necessary in the apolegamy of characteristic, the triggering of grid (door) pole, flow equalizing circuit etc., take certain measure。Line level parallel connection carries out parallel connection again after referring to each brachium pontis midpoint in parallel current-limiting reactor, this parallel way simple in construction, but reactor volume, weight, relatively costly。Controller is integrated in each parallel units by Unit Level parallel connection in the lump, and the motility of system is significantly high, is beneficial to and carries out simple combination, is that the main flow being applied to Large Copacity grid-connected inverter system selects。
For combining inverter parallel system, owing to the dc bus of each combining inverter unit is independent from, if each DC bus-bar voltage is inconsistent, the PWM voltage of each inverter output must differ, thus causing the higher hamonic wave circulation between each parallel units, this higher hamonic wave circulation that this parallel system exists makes grid-connected current waveform be distorted on the one hand, can produce again extra loss on the other hand；Additionally, if control strategy is that the voltage modulation signal that each unit produces is separate, different, owing to there are differences between voltage modulation signal, this will cause that the driving signal of power switching tube that each inversion unit produces is inconsistent, therefore inherently there is circulation between parallel units。
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the deficiencies in the prior art, it is provided that a kind of combining inverter parallel system and control method thereof, enables each parallel units uniformly to share grid-connected current。
For solving technical problem, the solution of the present invention is:
A kind of combining inverter parallel system is provided, comprises n parallel units, between two public sys node A and B of parallel units outlet side, bridge a public filter capacitor C；Being additionally provided with a public filter inductance L, its one end is connected with public sys node B, and the other end is then connected with electrical network；
For parallel units i, i=1,2...n: include a high-frequency isolation full-bridge DC-DC converter and a H bridge combining inverter；The input bridging magnitude of voltage of DC-DC converter i is EiDC source or electric capacity；By the full control switching tube K with inverse parallel fly-wheel diodei1, Ki2, Ki3With Ki4Constituting H bridge topology, this H bridge input side and magnitude of voltage are EiDC source or electric capacity be connected, outlet side and high frequency transformer TiFormer limit is connected；By four power diode Di1, Di2, Di3With Di4Constitute rectifier bridge, rectifier bridge input side and high frequency transformer TiSecondary is connected, and rectifier bridge outlet side bridges by filter inductance LfiWith filter capacitor CfiThe low pass filter constituted；The input voltage of H bridge combining inverter i is by the output filter capacitor C of DC-DC converter ifiBoth end voltage provides；By the full control switching tube S with inverse parallel fly-wheel diodei1, Si2, Si3With Si4Constitute H bridge combining inverter i topology, this H bridge input side and filter capacitor CfiTwo ends be connected, two exit points of H bridge respectively with filter inductance Li1, Li2One end be connected, filter inductance Li1The other end is connected with terminal A, filter inductance Li2The other end is connected with terminal B。
Invention further provides the combining inverter control method for parallel based on aforementioned system, wherein, control to comprise the following steps to the operation of DC-DC converter i:
(1) the output voltage V of sampling DC-DC converter iiWith flow through filter inductance LfiElectric current ii；
(2), after obtaining 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, makes after the recovery as all pressing actuator GViInput；
(4) actuator G is all pressedViOutput be added with given DC voltage after, then with output voltage ViMake the result of after the recovery as voltage regulator GDiInput；
(5) voltage regulator GDiOutput and filter inductance difference between currents as rheonome GIiInput；
(6) rheonome GIiOutput compare with triangular carrier and obtain DC-DC converter i and entirely control switching tube Ki1, Ki2, Ki3With Ki4Driving signal。
Invention further provides the combining inverter control method for parallel based on aforementioned system, wherein, control to comprise the following steps to the operation of H bridge combining inverter i in system:
(1) the phase place V of electrical network is detectedg/|Vg|, and the grid-connected current i in public filter inductance Lg；
(2) grid-connected current amplitude set-point IgrefWith grid phase Vg/|Vg| it is multiplied, obtains the instantaneous set-point i of grid-connected currentgref；
(3) by igref-igAs grid-connected current actuator GgInput；
(4)GgOutput compare with triangular carrier obtain in each H bridge combining inverter full control switching tube not optimized after driving signal S1, S2, S3With S4；
(5) the transmission speed v and transmission range L according to transmission mediumi, measure H bridge combining inverter i before being not added with time delay process and drive signal transmission time t from controller to drive circuiti, ti=Li/ v；
(6) t is selectediIn maximum of T；
(7) calculate H bridge combining inverter i and drive the delay time d needed for signali, di=T-ti；
(8) for H bridge combining inverter i, FPGA builds four digital shift units, according to the clock rate C lock of numerical shift device and delay time di, calculate the figure place 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 enters drive circuit through transmission medium and obtains control switching tube S entirelyi1, Si2, Si3With Si4Driving signal after optimization。
In the present invention, each DC-DC converter and each H bridge combining inverter are needed Synchronization Control；Further, the DC bus-bar voltage difference dispelling tactics of each H bridge combining inverter should be synchronously performed with driving signal synchronization policy。
In the present invention, for all pressures actuator arranged in DC-DC converter control system, voltage regulator and rheonome, grid-connected current actuator, all adopt pi regulator。
In the present invention, the circuit element parameter used by each parallel units keeps consistent as far as possible。
The present invention realizes principles illustrated:
DC-DC converter input bridging magnitude of voltage is EiDC source or electric capacity, by H bridge topology, input direct voltage is transformed to the PWM voltage of variable duty ratio, then high frequency transformer is utilized to regulate the amplitude of PWM voltage, and then be DC voltage by diode bridge rectification by PWM voltage transformation, eventually pass LC low pass filter and obtain galvanic current pressure；H bridge combining inverter input voltage is provided by the output DC voltage of DC-DC converter, by H bridge, input direct voltage is transformed to PWM voltage, two end points that H bridge is drawn are connected with two filter inductances respectively, and the other end of two filter inductances is connected with the public sys node of system, it is achieved output。
Compared with prior art, the invention has the beneficial effects as follows:
The combining inverter parallel system of the present invention and circulation dispelling tactics, overcome the inconsistent defect causing instantaneous circulation of inconsistent and each inversion unit driving signal of power switching tube of each DC bus-bar voltage in prior art, closer to desirable non-loop operation state, each parallel units can be enable uniformly to share total grid-connected current。
Accompanying drawing illustrates:
Fig. 1 combining inverter parallel system main circuit diagram；
Fig. 2 each unit DC-DC converter drives signal to produce block diagram；
Driving signal after Fig. 3 each unit H bridge combining inverter is not optimized produces block diagram；
Driving signal after the optimization of Fig. 4 each unit H bridge combining inverter produces block diagram。
Detailed description of the invention
The optimized integration of the present invention is, based on combining inverter parallel system, comprises n parallel units。Bridging a public filter capacitor C between two public sys node A and B of outlet side, public filter inductance L one end is connected with terminal B, and the other end of public filter inductance L is connected with electrical network。For parallel units i (i=1,2...n), including a high-frequency isolation full-bridge DC-DC converter and a H bridge combining inverter。
DC-DC converter i input bridging magnitude of voltage is EiDC source。By the full control switching tube K with inverse parallel fly-wheel diodei1, Ki2, Ki3With Ki4Constitute H bridge topology, this H bridge input side and DC source EiIt is connected, outlet side and high frequency transformer TiFormer limit is connected。By four power diode Di1, Di2, Di3With Di4Constitute rectifier bridge, rectifier bridge input side and high frequency transformer TiSecondary is connected, and rectifier bridge outlet side bridges by filter inductance LfiWith filter capacitor CfiThe low pass filter constituted。
H bridge combining inverter i input voltage is by the output filter capacitor C of DC-DC converter ifiBoth end voltage provides。By the full control switching tube S with inverse parallel fly-wheel diodei1, Si2, Si3With Si4Constitute H bridge topology, this H bridge input side and filter capacitor CfiTwo ends be connected, two exit points of H bridge respectively with filter inductance Li1With Li2One end is connected, filter inductance Li1The other end is connected with terminal A, filter inductance Li2The other end is connected with terminal B。
In the present invention, the specific works process of DC-DC converter i (i=1,2...n) carries out as follows:
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 presses formula (1) calculating；
V = Σ i = 1 n V i n - - - ( 1 )
3) average output voltage V and DC-DC converter i output voltage ViMake after the recovery as all pressing actuator GViInput；
4) [given DC voltage Vref+GViOutput-Vi] as voltage regulator GDiInput；
5)[GDiOutput-ii] as rheonome GIiInput；
6)GIiOutput compare with triangular carrier obtain full control switching tube Ki1, Ki2, Ki3With Ki4Driving signal。
In the present invention, the specific works process of H bridge combining inverter i (i=1,2...n) carries out as follows:
1) phase place (V of electrical network is detectedg/|Vg|) with public filter inductance L in grid-connected current ig；
2) the instantaneous set-point i of grid-connected currentgrefCalculate by formula (2), IgrefFor grid-connected current amplitude set-point；
igref=Igref*(Vg/|Vg|)(2)
3)[igref-ig] as grid-connected current actuator GgInput；
4)GgOutput compare with triangular carrier obtain in each H bridge combining inverter full control switching tube not optimized after driving signal S1, S2, S3With S4；
5) the transmission speed v and transmission range L according to transmission mediumi, measure H bridge combining inverter i before being not added with time delay process by formula (3) and drive signal transmission time t from controller to drive circuiti；
ti=Li/v(3)
6) t is selectediMaximum of T in (i=1,2...n)；
7) calculate H bridge combining inverter i by formula (4) and drive the delay time d needed for signali；
di=T-ti(4)
8) for H bridge combining inverter i, FPGA builds four digital shift units, according to the clock rate C lock of numerical shift device and delay time di, calculate the figure place 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 enters drive circuit through transmission medium and obtains control switching tube S entirelyi1, Si2, Si3With Si4Driving signal after optimization。
Below in conjunction with accompanying drawing and further illustrate the present invention。
Fig. 1 show combining inverter parallel system main circuit diagram, comprises n parallel units。Bridging a public filter capacitor C between two public sys node A and B of outlet side, public filter inductance L one end is connected with terminal B, and the other end of public filter inductance L is connected with electrical network。In parallel units i (i=1,2...n), DC-DC converter i input bridging magnitude of voltage is EiDC source。By the full control switching tube K with inverse parallel fly-wheel diodei1, Ki2, Ki3With Ki4Constitute H bridge topology, this H bridge input side and DC source EiIt is connected, outlet side and high frequency transformer TiFormer limit is connected。By four power diode Di1, Di2, Di3With Di4Constitute rectifier bridge, rectifier bridge input side and high frequency transformer TiSecondary is connected, and rectifier bridge outlet side bridges by filter inductance LfiWith filter capacitor CfiThe low pass filter constituted。In parallel units i, H bridge combining inverter i input voltage is by the output filter capacitor C of DC-DC converter ifiBoth end voltage provides。By the full control switching tube S with inverse parallel fly-wheel diodei1, Si2, Si3With Si4Constitute H bridge topology, this H bridge input side and filter capacitor CfiTwo ends be connected, two exit points of H bridge 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) and drives signal to produce block diagram, and concrete production process carries out as follows: the output voltage V of each DC-DC converter i that 1) samplesiWith flow through filter inductance LfiElectric current ii；2) DC-DC converter output average voltage V is calculated；3) average output voltage V and DC-DC converter i output voltage ViMake after the recovery as all pressing actuator GViInput；4) [given DC voltage Vref+GViOutput-Vi] as voltage regulator GDiInput；5) [GDiOutput-ii] as rheonome GIiInput；6) GIiOutput compare with triangular carrier obtain full control switching tube Ki1, Ki2, Ki3With Ki4Driving signal。
Fig. 3 show H bridge combining inverter i (i=1,2...n) not optimized after driving signal produce block diagram, concrete production process carries out as follows: 1) detect electrical network phase place (Vg/|Vg|) with public filter inductance L in grid-connected current ig；2) the instantaneous set-point i of grid-connected current is calculatedgref；3) [igref-ig] as grid-connected current actuator GgInput；4) GgOutput compare with triangular carrier obtain in each H bridge combining inverter full control switching tube not optimized after driving signal S1, S2, S3With S4。
Fig. 4 show the driving signal after H bridge combining inverter i (i=1,2...n) optimizes and produces block diagram, and concrete production process carries out as follows: 1) the transmission speed v and transmission range L according to transmission mediumi, calculate H bridge combining inverter i before being not added with time delay process and drive signal transmission time t from controller to drive circuiti；2) t is selectediMaximum of T in (i=1,2...n)；3) calculate H bridge combining inverter i and drive the delay time d needed for signali；4) for H bridge combining inverter i, FPGA builds four digital shift units, according to the clock rate C lock of numerical shift device and delay time di, calculate the figure place N of numerical shift devicei, NiFor [di/ Clock] integer part；5) S1, S2, S3With S4Respectively as the input of four digital shift units, the output of four digital shift units enters drive circuit through transmission medium and obtains control switching tube S entirelyi1, Si2, Si3With Si4Driving signal after optimization。

Claims (6)

1. a combining inverter parallel system, comprises n parallel units, it is characterised in that bridge a public filter capacitor C between two public sys node A and B of parallel units outlet side；Being additionally provided with a public filter inductance L, its one end is connected with public sys node B, and the other end is then connected with electrical network；
For parallel units i, i=1,2 ... n: include a high-frequency isolation full-bridge DC-DC converter and a H bridge combining inverter；The input bridging magnitude of voltage of DC-DC converter i is EiDC source or electric capacity；By the full control switching tube K with inverse parallel fly-wheel diodei1, Ki2, Ki3With Ki4Constituting H bridge topology, this H bridge input side and magnitude of voltage are EiDC source or electric capacity be connected, outlet side and high frequency transformer TiFormer limit is connected；By four power diode Di1, Di2, Di3With Di4Constitute rectifier bridge, rectifier bridge input side and high frequency transformer TiSecondary is connected, and rectifier bridge outlet side bridges by filter inductance LfiWith filter capacitor CfiThe low pass filter constituted；The input voltage of H bridge combining inverter i is by the output filter capacitor C of DC-DC converter ifiBoth end voltage provides；By the full control switching tube S with inverse parallel fly-wheel diodei1, Si2, Si3With Si4Constitute H bridge combining inverter i topology, this H bridge input side and filter capacitor CfiTwo ends be connected, two exit points of H bridge respectively with filter inductance Li1、Li2One end be connected, filter inductance Li1The other end is connected with terminal A, filter inductance Li2The other end is connected with terminal B。
2. based on the combining inverter control method for parallel of system described in claim 1, it is characterised in that control to comprise the following steps to the operation of DC-DC converter i in this system:
(1) the output voltage V of sampling DC-DC converter iiWith flow through filter inductance LfiElectric current ii；
(2), after obtaining 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, makes after the recovery as all pressing actuator GViInput；
(4) actuator G is all pressedViOutput be added with given DC voltage after, then with output voltage ViMake the result of after the recovery as voltage regulator GDiInput；
(5) voltage regulator GDiOutput and filter inductance difference between currents as rheonome GIiInput；
(6) rheonome GIiOutput compare with triangular carrier and obtain DC-DC converter i and entirely control switching tube Ki1, Ki2, Ki3With Ki4Driving signal。
3. based on the combining inverter control method for parallel of system described in claim 1, it is characterised in that control to comprise the following steps to the operation of H bridge combining inverter i in this system:
(1) the phase place V of electrical network is detectedg/|Vg|, and the grid-connected current i in public filter inductance Lg；
(2) grid-connected current amplitude set-point IgrefWith grid phase Vg/|Vg| it is multiplied, obtains the instantaneous set-point i of grid-connected currentgref；
(3) by igref-igAs grid-connected current actuator GgInput；
(4)GgOutput compare with triangular carrier obtain in each H bridge combining inverter full control switching tube not optimized after driving signal S1, S2, S3With S4；
(5) the transmission speed v and transmission range L according to transmission mediumi, measure H bridge combining inverter i before being not added with time delay process and drive signal transmission time t from controller to drive circuiti, ti=Li/ v；
(6) t is selectediIn maximum of T；
(7) calculate H bridge combining inverter i and drive the delay time d needed for signali, di=T-ti；
(8) for H bridge combining inverter i, FPGA builds four digital shift units, according to the clock rate C lock of numerical shift device and delay time di, calculate the figure place 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 enters drive circuit through transmission medium and obtains control switching tube S entirelyi1, Si2, Si3With Si4Driving signal after optimization。
4. according to the method in claim 2 or 3, it is characterised in that each DC-DC converter and each H bridge combining inverter are needed Synchronization Control；Further, the DC bus-bar voltage difference dispelling tactics of each H bridge combining inverter should be synchronously performed with driving signal synchronization policy。
5. method according to claim 2, it is characterised in that for all pressures actuator arranged in DC-DC converter control system, voltage regulator and rheonome, all adopt pi regulator。
6. method according to claim 3, it is characterised in that the grid-connected current actuator arranged in DC-DC converter control system adopts pi regulator。
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