CN109873568A - A kind of more DC port inverters and control method - Google Patents

A kind of more DC port inverters and control method Download PDF

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Publication number
CN109873568A
CN109873568A CN201910120985.4A CN201910120985A CN109873568A CN 109873568 A CN109873568 A CN 109873568A CN 201910120985 A CN201910120985 A CN 201910120985A CN 109873568 A CN109873568 A CN 109873568A
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CN
China
Prior art keywords
port
module
voltage direct
inverters
voltage
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Pending
Application number
CN201910120985.4A
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Chinese (zh)
Inventor
谢晔源
王宇
李海英
曹冬明
连建阳
张中锋
杨晨
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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Application filed by NR Electric Co Ltd, NR Engineering Co Ltd filed Critical NR Electric Co Ltd
Priority to CN201910120985.4A priority Critical patent/CN109873568A/en
Publication of CN109873568A publication Critical patent/CN109873568A/en
Priority to PCT/CN2020/075665 priority patent/WO2020169018A1/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • 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
    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • 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
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a kind of more DC port inverters, the inverter includes a multiwinding transformer and M unidirectional current changer modules and N number of bi-directional inverter module, the multiwinding transformer includes a primary side winding and M+N vice-side winding, unidirectional current changer module connects one to one with the side that exchanges of bi-directional inverter module with vice-side winding, the DC side of N number of bi-directional inverter module cascades, its two ends constitutes low-voltage direct port, DC side of the low-voltage direct port again with M unidirectional current changer modules cascades, its two ends constitutes high voltage direct current port.The present invention proposes corresponding control method simultaneously.The more DC port inverters of the present invention can provide multiple DC ports, constitute DC bus, connect DC load and DC power supply, have redundancy feature, high reliablity, cost performance height.

Description

A kind of more DC port inverters and control method
Technical field
The present invention relates to a kind of more DC port inverters and control methods, belong to High Power Electronic Converter Technology neck Domain.
Background technique
DC distribution net demand in recent years it is continuous increase and power electronic technique it is increasingly mature, distributed power generation exists Will be used wider and wider in power grid is general, such as new energy distributed power generation, distributed generation resource, load and energy storage device structure At microgrid, the type of numerous distributed generation resources, load and energy storage device is different, includes direct current or exchange, voltage class, capacity Also not identical, how by said units economy, efficiently access, carry out unified management be more scabrous problem；Currently, existing DC distribution net access architecture it is complex, it usually needs a high voltage ac/dc converter, such as the friendship of modular multilevel DC transformer and multiple DC/DC converters are constituted, and cost of implementation and realization difficulty are relatively high, as shown in Fig. 2, including two Set high pressure AC/DC converter and multiple DC/DC converters, the present invention provide a kind of solution direct current distribution high-low pressure of low cost More DC port inverters of access.
Summary of the invention
To solve the above-mentioned problems, it the invention proposes a kind of more DC port inverters and control method, only one buys or get by illegal means Stream device can provide the DC port of multiple and different voltage class, can connect multiple groups DC bus, without increasing additional investment, property Valence is than high.
Specific scheme is as follows:
A kind of more DC port inverters, more DC port inverters include that a multiwinding transformer and M are single To current changer module and N number of bi-directional inverter module, M is that integer, the N more than or equal to 2 are the integer more than or equal to 1, described more Winding transformer includes a primary side winding and M+N vice-side winding, unidirectional current changer module and bi-directional inverter module Exchange side connects one to one with vice-side winding, the DC output side cascade of N number of bi-directional inverter module, and cascade head end is fixed Justice is low-voltage direct port anode, and cascade tail end is defined as low-voltage direct port cathode；The low-voltage direct port is single with M again It is cascaded to the DC output side of current changer module, cascade head end is defined as high voltage direct current port anode, and cascade tail end is defined as height Straightening flow port cathode.
Further, the unidirectional current changer module is constituted by not controlling type or half control type power semiconductor.
Further, the bi-directional inverter module is made of full-control type power semiconductor.
Further, N number of bi-directional inverter module is located at all current changer modules in more DC port inverters Middle position.
Further, the low-voltage direct port is connect with high voltage direct current port by DC/DC converter, the DC/DC Converter connects the direct current of different amplitudes, and realizes the two-way flow of energy.
Further, more DC port inverters further include K DC port, and K is more than or equal to 2 and to be less than or equal to (M+N) integer；Arbitrarily take K a continuous in M unidirectional current changer modules and the block coupled in series chain of N number of bi-directional inverter module Module, drawing port close to the module anode of high voltage direct current port anode is K DC port anode, close high voltage direct current end It is K DC port cathode that the module negative of mouth cathode, which draws port,.
Further, the low-voltage direct port is connect with K DC port by DC/DC converter.
Further, the N is even number more than or equal to 2, from low-voltage direct port anode to low-voltage direct port cathode The cathode of direction number, the N/2 bi-directional inverter module is drawn and is grounded.
Further, the DC output side of any two or multiple bi-directional inverter modules is connected in parallel, i.e., arbitrarily The anode of the DC output side of two or more two-way modules is connected, and the cathode of corresponding DC output side is connected.
Further, the DC output side of any two or multiple unidirectional current changer modules is connected in parallel, i.e., arbitrarily The anode of the DC output side of two or more unidirectional modules is connected, and the cathode of corresponding DC output side is connected.
Further, the unidirectional current changer module is bypassed with the DC output side of bi-directional inverter module one also in parallel Switch.
Further, the unidirectional current changer module and the DC output side of bi-directional inverter module are also connected an electric power Electronic unit.
Further, the power electronics unit quickly disjunction can export DC current, can bypass current changer module DC output side, output voltage can be adjusted.
Further, the power electronics unit is by two full-control type power semiconductor IGBT half-bridge module structures At just extremely the collector of upper tube IGBT, the input side cathode of power electronics unit are down tube to the input side of power electronics unit The power generation pole of IGBT, half-bridge mid point, which is drawn, is used as output cathode, and output negative pole is with defeated as cathode is connect.
Further, the power electronics unit is the full-bridge modules structure by four full-control type power semiconductor IGBT At.
Further, the power electronics unit is made of half-bridge module, inductance and DC capacitor, power electronics unit Input side connects half-bridge module both ends, and the midpoint connection inductance of half-bridge module is as power electronics unit outlet side, and outlet side is simultaneously Join DC capacitor.
Further, the power electronics unit is made of half-bridge module, inductance and DC capacitor, power electronics unit Input side anode is connect through inductance with half-bridge module midpoint, and half-bridge module both ends parallel connection direct capacitor is defeated as power electronics unit Side out.18, a kind of more DC port inverters as described in claim 1, it is characterised in that: the unidirectional current changer module with Bi-directional inverter module exchanges alternating-current switch of connecting between side and the vice-side winding of multiwinding transformer.
Further, the phase phase difference certain angle between the vice-side winding of the multiwinding transformer, to eliminate primary side Harmonic wave.
Further, the unidirectional current changer module include the AC/DC convertor being made of diode or thyristor and DC capacitor, DC side and the DC capacitor of AC/DC convertor are connected in parallel, the exchange side of AC/DC convertor and Multiple coil The secondary side of transformer connects.
Further, the bi-directional inverter module includes the ac-dc conversion being made of full-control type power semiconductor Device, DC capacitor and filter unit, DC side and the DC capacitor of AC/DC convertor are connected in parallel, AC/DC convertor After exchange side is connect with filter unit, then it connect with the secondary side of multiwinding transformer.
The invention also includes the control methods of more DC port inverters:
(1) when more DC port inverters start, following step can be used:
Step 1: the closure single, double alternating-current switch to current changer module；
Step 2: the electrification of multiwinding transformer primary side, it is single, double to enter charged state to the DC capacitor of current changer module；
Step 3: after the completion of to be charged, DC capacitor voltage is stablized, and starts bi-directional inverter module, power semiconductor Unlock adjusts bi-directional inverter module output DC voltage and reaches target value.
(2) it when needing to adjust the DC voltage of high voltage direct current port after the starting of more DC port inverters, can be used down State one of four kinds of control methods:
Method 1: adjusting the DC voltage of low-voltage direct port, and the DC voltage of high voltage direct current port changes therewith；
Method 2: when unidirectional inverter uses half control type device, according to set target value, unidirectional current changer module is calculated Output voltage, control the turn on thyristors time of unidirectional inverter, control the output voltage of unidirectional current changer module.
Method 3: according to set target value, the output voltage of unidirectional current changer module is calculated, utilizes unidirectional current changer module In power electronics unit, control the output voltage of unidirectional current changer module；
Method 4: using the power electronics unit in unidirectional current changer module, by a certain number of unidirectional current changer modules Road.
Wherein, when the current changer module includes by-pass switch, following control methods can be used: according to setting target Value, the quantity of unidirectional current changer module needed for calculating, using the by-pass switch in unidirectional current changer module, by a certain number of lists It is bypassed to current changer module；
(3) when the load emergent power on low-voltage direct port is sent, one of following two kinds of control methods can be used:
Method 1: detecting that low-voltage direct port voltage increases, and bi-directional inverter module is passed by transformer secondary to primary side Defeated remaining energy；
Method 2: detecting that low-voltage direct port voltage increases, surplus to high voltage direct current port transmission by DC/DC converter Remaining energy.
(4) when the load emergent power on high voltage direct current port is sent, one of following two kinds of control methods can be used:
Method 1: detecting that high voltage direct current port voltage increases, surplus to low-voltage direct port transmission by DC/DC converter Remaining energy.
Method 2: part energy is transferred to load by low-voltage direct port, when detect low-voltage direct port voltage increase When, bi-directional inverter module transmits remaining energy to primary side by transformer secondary；
Beneficial effects of the present invention:
1, the invention proposes a kind of more DC port inverters, pass through multiple cascade sides of change of current module DC capacitor Formula constructs multiple groups DC port, wherein the low-voltage direct port of two-way change of current module composition can realize to and fro flow of power, is applicable in In the access of power supply or load, the high voltage direct current port of unidirectional change of current module composition is suitble to the access of load, and the present invention is in high pressure Further include two-way DC/DC converter between DC port and low-voltage direct port, when inverse probability occurs in load side, can pass through Inverse probability is transferred to another port by two-way DC/DC converter, or is transferred to transformer primary side, the DC port change of current more than one Device can provide high voltage direct current and low-voltage direct port simultaneously, while can handle inverse probability.Facilitate the access of direct current distribution.Scheme At low cost, cost performance is high.
2, the secondary side of the unidirectional current changer module of the present invention and bi-directional inverter module and multiwinding transformer connects, and passes through pair Side winding is mutually isolated, while being provided with power electronics unit and alternating-current switch, it may be convenient to according to actual demand, adjust The quantity of the current changer module of whole investment, or change the series-parallel system of current changer module outlet side, when needing voltage higher, , can be in parallel by module outlet side when needing electric current larger using concatenated schemes, the flexibility of scheme is improved, meanwhile, work as mould When block failure, malfunctioning module can also be cut off rapidly, greatly improve the reliability of scheme.
Detailed description of the invention
Fig. 1 is more DC port inverter theory of constitution figures of the invention；
Fig. 2 is direct current distribution exemplary topology diagram in the prior art；
Fig. 3 is the first embodiment of power electronics unit；
Fig. 4 is the second embodiment of power electronics unit；
Fig. 5 is the 3rd embodiment of power electronics unit；
Fig. 6 is the fourth embodiment of power electronics unit；
Fig. 7 is the second embodiment of more DC port inverters of the invention；
Fig. 8 is the 3rd embodiment of more DC port inverters of the invention；
Fig. 9 is the fourth embodiment of more DC port inverters of the invention；
Figure label title: 1, multiwinding transformer；2, unidirectional current changer module；3, bi-directional inverter module；4, high pressure DC port anode；5, high voltage direct current port cathode；6, low-voltage direct port anode；7, low-voltage direct port cathode；8, it exchanges Switch；9, power electronics unit；10, DC/DC converter；11, by-pass switch.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
As shown in Figure 1, the more DC port inverters of the present invention include a multiwinding transformer 1 and M unidirectional inverters Module 2 and N number of bi-directional inverter module 3, M are that integer, the N more than or equal to 2 are the integer more than or equal to 1, and the Multiple coil becomes Depressor includes a primary side winding and M+N vice-side winding, and unidirectional current changer module exchanges side with bi-directional inverter module It connects one to one with vice-side winding, the DC output side cascade of N number of bi-directional inverter module, cascade head end is defined as low Straightening flow port anode 6, cascade tail end are defined as low-voltage direct port cathode 7；The low-voltage direct port is unidirectionally changed with M again The DC output side cascade of device module is flowed, cascade head end is defined as high voltage direct current port anode 4, and cascade tail end is defined as high straightening Flow port cathode 5；The unidirectional current changer module is constituted by not controlling type or half control type power semiconductor, the two-way change of current Device module is made of full-control type power semiconductor.
Wherein, in the present embodiment, N number of bi-directional inverter module is located at all changes of current in more DC port inverters The middle position of device module.As shown in Figure 1, respectively including the identical unidirectional change of current of quantity above and below bi-directional inverter module Device module.
Wherein, the low-voltage direct port is connect with high voltage direct current port by DC/DC converter 10, and the DC/DC becomes Parallel operation connects the direct current of different amplitudes, and realizes the two-way flow of energy.
More DC port inverters further include K DC port, and K is more than or equal to 2 and whole less than or equal to (M+N) Number；K continuous modules are arbitrarily taken in M unidirectional current changer modules and the block coupled in series chain of N number of bi-directional inverter module, are leaned on It is K DC port anode that the module anode of nearly high voltage direct current port anode, which draws port, close to high voltage direct current port cathode Module negative draw port be K DC port cathode.The series connection of any continuous module composition in the embodiment of the present invention Chain port can be drawn.
Wherein, the low-voltage direct port is connect with K DC port by DC/DC converter.
Wherein, the N is even number more than or equal to 2, from low-voltage direct port anode to low-voltage direct port cathode direction Number, the cathode of the N/2 bi-directional inverter module are drawn and are grounded.As shown in fig. 7, as N=2, two bi-directional inverter moulds The cathode at the midpoint of block, i.e., the 1st bi-directional inverter module is drawn and is grounded, and true bipolar DC system is constituted.
Wherein, the DC output side of any two or multiple bi-directional inverter modules can be connected in parallel, i.e., each The anode of the DC output side of two-way modules is connected, and the cathode of corresponding DC output side is connected.
Wherein, the DC output side of any two or multiple unidirectional current changer modules also can be connected in parallel, i.e., respectively The anode of the DC output side of a unidirectional module is connected, and the cathode of corresponding DC output side is connected.As shown in figure 8, every two After single-phase module parallel connection constitutes one group, then cascade.
Wherein, the unidirectional current changer module and the DC output side of a bi-directional inverter module by-pass switch also in parallel 11。
Wherein, the unidirectional current changer module and the DC output side of bi-directional inverter module are also connected a power electronics Unit 9.
Wherein, the power electronics unit quickly disjunction can export DC current, can bypass the straight of current changer module Outlet side is flowed, output voltage can be adjusted.
As shown in figure 3, being the first embodiment of power electronics unit, power electronics unit is by two full-control type power half Conductor device IGBT half-bridge module is constituted, and just extremely the collector of upper tube IGBT, input side cathode are down tube IGBT's to input side Generate electricity pole, and half-bridge mid point, which is drawn, is used as output cathode, and output negative pole is with defeated as cathode is connect.When operating normally, upper tube IGBT Conducting, down tube IGBT shutdown, when needing disjunction, upper tube IGBT is turned off, down tube IGBT is held off.When needing to bypass, Upper tube IGBT shutdown, down tube IGBT conducting.As shown in figure 4, being the second embodiment of power electronics unit, power electronics unit is It is made of the full-bridge modules of four full-control type power semiconductor IGBT.Fig. 5 and Fig. 6 is that the third with voltage regulation function is implemented Example and fourth embodiment, by half-bridge module, inductance and capacitor are constituted, and the input side of Fig. 5 power electronics unit connects half-bridge module Both ends, the midpoint connection inductance of half-bridge module is as power electronics unit outlet side, outlet side parallel connection direct capacitor；Fig. 6 electric power The input side anode of electronic unit is connect through inductance with half-bridge module midpoint, and half-bridge module both ends parallel connection direct capacitor is as electric power Electronic unit outlet side.
Wherein, the unidirectional current changer module exchanges the vice-side winding of side and multiwinding transformer with bi-directional inverter module Between also connect an alternating-current switch 8.
Wherein, the phase phase difference certain angle between the vice-side winding of the multiwinding transformer, to eliminate primary side harmonic wave.
Wherein, the unidirectional current changer module includes the AC/DC convertor and direct current being made of diode or thyristor Capacitor, DC side and the DC capacitor of AC/DC convertor are connected in parallel, the exchange side of AC/DC convertor and Multiple coil transformation The secondary side of device connects.
Wherein, the bi-directional inverter module include the AC/DC convertor being made of full-control type power semiconductor, DC capacitor and filter unit, DC side and the DC capacitor of AC/DC convertor are connected in parallel, the friendship of AC/DC convertor After stream side is connect with filter unit, then it connect with the secondary side of multiwinding transformer.
It is exemplified below an application scenarios and further illustrates application and control method of the invention, how straight the present invention is Flow port inverter can be applied to DC distribution net occasion, as shown in Figure 9.
Wherein, N number of bi-directional inverter module is located at the middle positions of all modules in the inverter.In the application Middle M=10, N=2, it is centrally located that the present embodiment summarizes 2 bi-directional inverter modules, the top of bi-directional inverter module and Lower section respectively includes 5 unidirectional current changer modules, and wherein bi-directional inverter module exports rated direct voltage ± 375V, and 10 unidirectional Current changer module output voltage is 1.925kV, and direct voltage is superimposed after series connection, and total nominal voltage is ± 10kV, high voltage direct current Port is connect with load bus, and load bus is ± 10kV direct current.The interface as direct current distribution is drawn in low-voltage direct port, leads to DC/DC converter is crossed by energy-storage system or photovoltaic system access or DC load.
(1) when more DC port inverters start:
Step 1: the closure single, double alternating-current switch to current changer module；
Step 2: the electrification of multiwinding transformer primary side, it is single, double to enter charged state to the DC capacitor of current changer module；
Step 3: after the completion of to be charged, DC capacitor voltage is stablized, and starts bi-directional inverter module, power semiconductor Unlock adjusts bi-directional inverter module output DC voltage and reaches target value.
(2) when more DC port inverters need to adjust the DC voltage of high voltage direct current port, following two kinds be can be used One of control method:
Method 1: adjusting the DC voltage of low-voltage direct port, and the DC voltage of high voltage direct current port changes therewith；
Method 2: according to set target value, the quantity of unidirectional current changer module, utilizes unidirectional current changer module needed for calculating In power electronics unit or by-pass switch, a certain number of unidirectional current changer modules are bypassed.
Such as output voltage is adjusted in this application occasion and arrives ± 10.5kV, method 1 can be used, by adjusting the two-way change of current Low-voltage direct port voltage is adjusted and arrives ± 400V by the output DC voltage of device module.
Such as output voltage is adjusted and arrives ± 8kV, method 2 can be used, utilize the power electronics list in unidirectional current changer module 2 unidirectional current changer modules are bypassed, can bypass each module up and down by member, realize that output voltage is adjusted.
Method 3: half control type device, such as thyristor, the bridge-type electricity that thyristor is constituted can be used in above-mentioned single-phase inverters module Road has output DC voltage regulation function.
Method 4: circuit as shown in Figure 5 can be used in above-mentioned power electronics unit, which is typical reduction regulation circuit, Module can be exported DC voltage to turn down, adjust and arrive ± 8kV.
(3) when the load emergent power on low-voltage direct port is sent, one of following two kinds of control methods can be used:
Method 1: detecting that low-voltage direct port voltage increases, and bi-directional inverter module is passed by transformer secondary to primary side Defeated remaining energy；
Method 2: detecting that low-voltage direct port voltage increases, surplus to high voltage direct current port transmission by DC/DC converter Remaining energy.
In this application occasion, if low-voltage direct photovoltaic generation unit output power is greater than DC load, occur It send, is selected in two methods, when high voltage direct current port needs this portion of energy, optional selection method 2, also optional selection method 1, is incited somebody to action Superfluous energy sends power grid back to.
(4) when the load emergent power on high voltage direct current port is sent, one of following two kinds of control methods can be used:
Method 1: detecting that high voltage direct current port voltage increases, surplus to low-voltage direct port transmission by DC/DC converter Remaining energy.
Method 2: part energy is transferred to load by low-voltage direct port, when detect low-voltage direct port voltage increase When, bi-directional inverter module transmits remaining energy to primary side by transformer secondary；
In this application occasion, when the load emergent power on high voltage direct current port is sent, selected in two methods, When low-voltage direct port can dissolve this portion of energy, optional selection method 1 transmits energy to low-voltage direct port；If energy Excessive, method 1 can not completely consume, also optional selection method 2, and the energy of another part surplus is logical by bi-directional inverter module It crosses transformer and sends power grid back to.
The above examples are only used to illustrate the technical scheme of the present invention rather than its limitations, carries out referring to above-described embodiment Various forms is modified or is changed within the scope of the present invention.

Claims (27)

1. a kind of more DC port inverters, which is characterized in that more DC port inverters include a Multiple coil transformation Device and M unidirectional current changer modules and N number of bi-directional inverter module, it is whole more than or equal to 1 that M, which is more than or equal to 2 integer, N, Number, the multiwinding transformer include a primary side winding and M+N vice-side winding, unidirectional current changer module and the two-way change of current Exchange side and the vice-side winding of device module connect one to one, the DC output side cascade of N number of bi-directional inverter module, grade Connection head end is defined as low-voltage direct port anode, and cascade tail end is defined as low-voltage direct port cathode；The low-voltage direct port The DC output side with M unidirectional current changer modules cascades again, and cascade head end is defined as high voltage direct current port anode, cascades tail end It is defined as high voltage direct current port cathode.
2. a kind of more DC port inverters as described in claim 1, it is characterised in that: the unidirectional current changer module is not by Control type or half control type power semiconductor are constituted.
3. a kind of more DC port inverters as described in claim 1, it is characterised in that: the bi-directional inverter module is by complete Control type power semiconductor is constituted.
4. a kind of more DC port inverters as described in claim 1, it is characterised in that: in more DC port inverters N number of bi-directional inverter module is located at the middle position of all current changer modules.
5. a kind of more DC port inverters as described in claim 1, it is characterised in that: the low-voltage direct port and high pressure DC port is connected by DC/DC converter, and the DC/DC converter connects the direct current of different amplitudes, and realizes energy Two-way flow.
6. a kind of more DC port inverters as described in claim 1, it is characterised in that: more DC port inverters are also Including K DC port, K is the integer more than or equal to 2 and less than or equal to (M+N)；In M unidirectional current changer modules and N number of pair K continuous modules are arbitrarily taken into the block coupled in series chain of current changer module, close to the module anode of high voltage direct current port anode Drawing port is K DC port anode, and drawing port close to the module negative of high voltage direct current port cathode is K DC terminal Mouth cathode.
7. a kind of more DC port inverters as claimed in claim 6, it is characterised in that: the low-voltage direct port and K DC port is connected by DC/DC converter.
8. a kind of more DC port inverters as claimed in claim 4, it is characterised in that: the N is the idol more than or equal to 2 Number, from low-voltage direct port anode to low-voltage direct port cathode direction number, the cathode of the N/2 bi-directional inverter module is drawn And it is grounded.
9. a kind of more DC port inverters as described in claim 1, it is characterised in that: any two are multiple two-way The DC output side of current changer module is connected in parallel, i.e. the positive phase of the DC output side of any two or multiple two-way modules Even, the cathode of corresponding DC output side is connected.
10. a kind of more DC port inverters as described in claim 1, it is characterised in that: any two or multiple lists It is connected in parallel to the DC output side of current changer module, i.e. the positive phase of the DC output side of any two or multiple unidirectional modules Even, the cathode of corresponding DC output side is connected.
11. a kind of more DC port inverters as described in claim 1, it is characterised in that: the unidirectional current changer module with The DC output side of a bi-directional inverter module by-pass switch also in parallel.
12. a kind of more DC port inverters as described in claim 1, it is characterised in that: the unidirectional current changer module with The DC output side of bi-directional inverter module is also connected a power electronics unit.
13. a kind of more DC port inverters as claimed in claim 12, it is characterised in that: the power electronics unit can Quick disjunction exports DC current, can bypass the DC output side of current changer module, can adjust output voltage.
14. a kind of more DC port inverters as claimed in claim 12, it is characterised in that: the power electronics unit is served as reasons Two full-control type power semiconductor IGBT half-bridge modules are constituted, the input side of power electronics unit just extremely upper tube IGBT's Collector, the input side cathode of power electronics unit are the power generation pole of down tube IGBT, and half-bridge mid point, which is drawn, is used as output cathode, defeated Cathode is with defeated as cathode is connect out.
15. a kind of more DC port inverters as claimed in claim 12, it is characterised in that: the power electronics unit is served as reasons The full-bridge modules of four full-control type power semiconductor IGBT are constituted.
16. a kind of more DC port inverters as claimed in claim 12, it is characterised in that: the power electronics unit is by half Bridge module, inductance and DC capacitor are constituted, and the input side of power electronics unit connects half-bridge module both ends, the midpoint of half-bridge module Inductance is connected as power electronics unit outlet side, outlet side parallel connection direct capacitor.
17. a kind of more DC port inverters as claimed in claim 12, it is characterised in that: the power electronics unit is by half Bridge module, inductance and DC capacitor are constituted, and the input side anode of power electronics unit is connect through inductance with half-bridge module midpoint, and half Bridge module both ends parallel connection direct capacitor is as power electronics unit outlet side.
18. a kind of more DC port inverters as described in claim 1, it is characterised in that: the unidirectional current changer module with Bi-directional inverter module exchanges alternating-current switch of connecting between side and the vice-side winding of multiwinding transformer.
19. a kind of more DC port inverters as described in claim 1, it is characterised in that: the pair of the multiwinding transformer Phase phase difference certain angle between the winding of side, to eliminate primary side harmonic wave.
20. a kind of more DC port inverters as described in claim 1, it is characterised in that: the unidirectional current changer module packet Include the AC/DC convertor and DC capacitor being made of diode or thyristor, the DC side and direct current of AC/DC convertor Appearance is connected in parallel, and the exchange side of AC/DC convertor and the secondary side of multiwinding transformer connect.
21. a kind of more DC port inverters as described in claim 1, it is characterised in that: the bi-directional inverter module packet Include AC/DC convertor, DC capacitor and the filter unit being made of full-control type power semiconductor, AC/DC convertor DC side be connected in parallel with DC capacitor, after the exchange side of AC/DC convertor is connect with filter unit, then with Multiple coil become The secondary side of depressor connects.
22. a kind of control method based on more DC ports inverter described in claim 18, it is characterised in that: when more DC terminals When mouth inverter starting, following step can be used:
Step 1: the closure single, double alternating-current switch to current changer module；
Step 2: the electrification of multiwinding transformer primary side, it is single, double to enter charged state to the DC capacitor of current changer module；
Step 3: after the completion of to be charged, DC capacitor voltage is stablized, and starts bi-directional inverter module, power semiconductor solution Lock adjusts bi-directional inverter module output DC voltage and reaches target value.
23. a kind of control method based on more DC ports inverter described in claim 1, it is characterised in that: when more DC terminals When needing to adjust the DC voltage of high voltage direct current port after mouth inverter starting, using one of following two kinds of control methods:
Method 1: adjusting the DC voltage of low-voltage direct port, and the DC voltage of high voltage direct current port changes therewith；
Method 2: when unidirectional inverter uses half control type device, according to set target value, the defeated of unidirectional current changer module is calculated Voltage out controls the turn on thyristors time of unidirectional inverter, controls the output voltage of unidirectional current changer module.
24. a kind of control method based on more DC ports inverter described in claim 13, it is characterised in that: when more DC terminals When needing to adjust the DC voltage of high voltage direct current port after mouth inverter starting, using one of following two kinds of control methods: method 1: according to set target value, calculating the output voltage of unidirectional current changer module, utilize the power electronics in unidirectional current changer module Unit controls the output voltage of unidirectional current changer module；
Method 2: using the power electronics unit in unidirectional current changer module, a certain number of unidirectional current changer modules are bypassed.
25. a kind of control method based on more DC ports inverter described in claim 11, it is characterised in that: when more DC terminals When needing to adjust the DC voltage of high voltage direct current port after mouth inverter starting, following control methods can be used: according to setting mesh Scale value, the quantity of unidirectional current changer module will be a certain number of using the by-pass switch in unidirectional current changer module needed for calculating Unidirectional current changer module bypass.
26. a kind of control method for wanting 5 more DC port inverters based on right, it is characterised in that: when low-voltage direct end When load emergent power on mouth is sent, one of following two kinds of control methods can be used:
Method 1: detecting that low-voltage direct port voltage increases, and bi-directional inverter module is surplus to primary side transmission by transformer secondary Remaining energy；
Method 2: detecting that low-voltage direct port voltage increases, remaining to high voltage direct current port transmission by DC/DC converter Energy.
27. a kind of control method for wanting 5 more DC port inverters based on right, it is characterised in that: when high voltage direct current end When load emergent power on mouth is sent, one of following two kinds of control methods can be used:
Method 1: detecting that high voltage direct current port voltage increases, remaining to low-voltage direct port transmission by DC/DC converter Energy；
Method 2: part energy is transferred to load by low-voltage direct port, when detecting that low-voltage direct port voltage increases, Bi-directional inverter module transmits remaining energy to primary side by transformer secondary.
CN201910120985.4A 2019-02-19 2019-02-19 A kind of more DC port inverters and control method Pending CN109873568A (en)

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