CN108777544A - DC/DC converters and its control method for flexible DC power transmission - Google Patents
DC/DC converters and its control method for flexible DC power transmission Download PDFInfo
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- CN108777544A CN108777544A CN201810591730.1A CN201810591730A CN108777544A CN 108777544 A CN108777544 A CN 108777544A CN 201810591730 A CN201810591730 A CN 201810591730A CN 108777544 A CN108777544 A CN 108777544A
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- bridge submodule
- voltage side
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- diode string
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—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
- H02M3/1584—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 with a plurality of power processing stages connected in parallel
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
For the DC/DC converters and its control method of flexible DC power transmission, belong to flexible direct-current transmission field, solves the problems, such as existing non-isolation type high pressure DC/DC converters there are stresses of parts that big, system loss is big and bulky.Converter：Diode string D1 and diode string D2 is connected between DC low-voltage side anode and high direct voltage side anode, and diode string D3 and diode string D4 are connected between the positive and negative electrode of DC low-voltage side.Switch S1 and switch S2 is in parallel with diode string D2 and diode string D4 respectively.Half-bridge submodule string and inductance L are connected between the common end of diode string D1 and diode string D2 and diode string D3 and the common end of diode string D4.Control method：The on off operating mode of switch S1 and switch S2 are set according to the power transmission direction between DC low-voltage side and high direct voltage side；The charge and discharge state of half-bridge submodule string is controlled, and then when power transmission occurs, maintains energy balance.
Description
Technical field
The present invention relates to a kind of DC/DC converters, belong to flexible direct-current transmission field.
Background technology
In recent years, with the development of flexible DC transmission technology, DC transmission engineering is from multi-terminal direct current transmission system
Change to having meshed DC grid.As transformer is for AC network, development of the DC/DC converters for DC grid
It plays a crucial role.Currently, in mesolow application, there is a large amount of DC/DC converter topologies, however, these are topological
It can not be expanded to due to by the restriction of the factors such as stresses of parts, loss, cost, voltage change ratio and filter volume weight
Hundred kilovolts, up to a hundred megawatts of grades.
For the DC/DC transformation of electrical energies of high voltage large capcity, occur many reports in recent years.Wherein, with " face-to-face "
Type modular multilevel DC/DC converters are that the isolated form DC/DC converters of representative occur earliest.This kind of DC/DC converts utensil
There is interstage exchange link, power transmission needs the two-stage total power unsteady flow link by DC-AC-direct current, and then leads to this
The component number of class DC/DC converters is excessive, and volume is big, and power attenuation is high, with high costs.
To solve the above-mentioned problems, researcher makes the modular multilevel change of current using modular multilevel DC converter
Device direct output of DC current pressure forms the non-isolation type DC/DC converters of single stage circuit structure.Such DC/DC converter can
Save the inevitable AC transformer of isolated form DC/DC converters.However, in order to maintain upper and lower bridge arm submodule capacitance electricity
The stabilization of pressure, such DC/DC converter need inject amplitude alternating voltage and circulation to realize the Power Exchange between bridge arm,
This causes stresses of parts and loss to significantly increase.In addition to this, the outlet side of such DC/DC converter needs to install extremely stupid
The filter of weight, this causes the volume of such DC/DC converter excessive.
Invention content
The present invention is to solve existing non-isolation type high pressure DC/DC converters there are stresses of parts that big, system loss is big and body
A kind of big problem of product, it is proposed that DC/DC converters and its control method for flexible DC power transmission.
DC/DC converters of the present invention for flexible DC power transmission include diode string D1~diode string D4,
Half-bridge submodule string, inductance L, switch S1 and switch S2；
The circuit structure all same of diode string D1~diode string D4, each diode string include multiple positive series connection
Diode；
Half-bridge submodule string includes half-bridge submodule SM1~half-bridge submodule SMN, half-bridge submodule SM1~half-bridge submodule
The circuit structure all same of block SMN, for half-bridge submodule SM1~half-bridge submodule SMN, the former current output terminal successively with
The current input terminal of the latter is connected；
The anode of diode string D1 is connected with the cathode of DC low-voltage side anode and diode string D3 simultaneously, diode string D1
Cathode simultaneously be connected with the first end of the current input terminal of half-bridge submodule SM1, the anode of diode string D2 and switch S1, two
The cathode of pole pipe string D2 is connected with the second end of switch S1 and high direct voltage side anode simultaneously；
The current output terminal of half-bridge submodule SMN is connected with the first end of inductance L, the second end of inductance L simultaneously with two poles
The anode of pipe string D3, the cathode of diode string D4 are connected with the first end of switch S2, the anode of diode string D4 simultaneously with switch
The second end of S2, DC low-voltage side cathode are connected with high direct voltage side cathode；
Half-bridge submodule SM1~half-bridge submodule SMN is used to, according to corresponding half-bridge submodule drive signal, realize
Synchronous charging or electric discharge, and then between DC low-voltage side and high direct voltage side energy balance is maintained when generation power transmission.
The control method of DC/DC converters of the present invention for flexible DC power transmission includes：
Step 1: switch S1 and switch S2 is arranged according to the power transmission direction between DC low-voltage side and high direct voltage side
On off operating mode；
Step 2: the charge and discharge state of control half-bridge submodule SM1~half-bridge submodule SMN, and then in DC low-voltage side
When power transmission occurring between high direct voltage side, energy balance is maintained.
As preferably, the particular content of step 1 is：
When power is transmitted from the lateral high direct voltage side of DC low-voltage, switch S1 and switch S2 are respectively set to disconnect shape
State and on-state；
When power is transmitted from the lateral DC low-voltage side of high direct voltage, switch S1 is respectively set to connect shape with switch S2
State and off-state.
As preferably, step 2 includes：
Step 2 one generates high direct voltage side current reference signal by the way of power control；
Step 2 two adjusts DC low-voltage side current reference signal by the way of energy balance control, so that half-bridge is sub
The capacitance voltage mean value of module SM1~half-bridge submodule SMN is equal to capacitance voltage and refers to mean value；
Step 2 three carries out high direct voltage side current reference signal and the DC low-voltage side current reference signal after adjusting
Superposition, and using superposed signal as half-bridge submodule string current reference signal；
It is step 2 four, half-bridge submodule string current reference signal and the difference of half-bridge submodule string actual current signal is defeated
Enter proportional and integral controller；
Step 2 five, the half-bridge submodule string voltage control signal based on proportional and integral controller output, and use half-bridge
The mode of the control of submodule capacitor voltage balance and modulation obtains the driving letter of half-bridge submodule SM1~half-bridge submodule SMN
Number.
The charge and discharge current path of the half-bridge submodule string of the present invention is by the work(between DC low-voltage side and high direct voltage side
The real-time voltage at rate transmission direction and half-bridge submodule string both ends codetermines：
When power is transmitted from the lateral high direct voltage side of DC low-voltage, half-bridge submodule string both end voltage is low-pressure side voltage
When, electric current flows through diode string D1 and charges for half-bridge submodule string；
When power is transmitted from the lateral high direct voltage side of DC low-voltage, half-bridge submodule string both end voltage is high side voltage
When, electric current flows through diode string D2 and discharges for half-bridge submodule string；
When power is electric for high and low pressure side from the lateral DC low-voltage side transmission of high direct voltage, half-bridge submodule string both end voltage
When the difference of pressure, electric current flows through diode string D3 and charges for half-bridge submodule string；
When power is transmitted from the lateral DC low-voltage side of high direct voltage, half-bridge submodule string both end voltage is high side voltage
When, electric current flows through diode string D4 and discharges for half-bridge submodule string.
DC/DC converters of the present invention for flexible DC power transmission make half under the control of the control method
Bridge submodule string occurs correspondingly to be charged or put during power transmission between DC low-voltage side and high direct voltage side
Electricity, and then realize flexible DC power transmission DC/DC transformation.Compared with existing non-isolation type high pressure DC/DC converters, institute of the present invention
The DC/DC converters for flexible DC power transmission stated are without injecting alternating voltage and the circulation of amplitude to realize between bridge arm
Power Exchange, without outfit filter.Therefore, the DC/DC converter energy of the present invention for flexible DC power transmission
The stresses of parts that enough efficiently solves existing non-isolation type high pressure DC/DC converters is big, the big and bulky problem of system loss.
Description of the drawings
It will hereinafter come based on the embodiments and with reference to the accompanying drawings to the DC/DC of the present invention for flexible DC power transmission
Converter and its control method are described in more detail, wherein：
Fig. 1 is the circuit diagram of the DC/DC converters for flexible DC power transmission described in embodiment, wherein iLFor
DC low-voltage side actual current signal, ipFor half-bridge submodule string actual current signal, iHBelieve for high direct voltage side actual current
Number, uPFor the virtual voltage at half-bridge submodule string both ends, ULFor DC low-voltage side voltage, UHFor high direct voltage side voltage；
Fig. 2 is the circuit diagram for the diode string that embodiment refers to；
Fig. 3 is the circuit diagram for the half-bridge submodule that embodiment refers to；
Fig. 4 is the control principle block diagram of the DC/DC converters for flexible DC power transmission described in embodiment, wherein Pref
For power reference signal, UC_refFor half-bridge submodule capacitor voltage mean value reference signal, UC_avgFor half-bridge submodule capacitor voltage
Mean value, PI are proportional and integral controller, iH_refFor high direct voltage side current reference signal, iL_refIndicate DC low-voltage side electric current
Reference signal, iP_refFor half-bridge submodule string current reference signal, uP_refFor half-bridge submodule string voltage control signal；
Fig. 5 is the circuit diagram of the derivative topological structure for the three-phase DC/DC converter parallel connections that embodiment refers to.
Specific implementation mode
Below in conjunction with attached drawing to the DC/DC converters and its control method of the present invention for flexible DC power transmission
It is described further.
Embodiment：The present embodiment is explained in detail with reference to Fig. 1 to Fig. 5.
Referring to Figures 1 and 2, the DC/DC converters for flexible DC power transmission described in the present embodiment include diode string
D1~diode string D4, half-bridge submodule string, inductance L, switch S1 and switch S2；
The circuit structure all same of diode string D1~diode string D4, each diode string include multiple positive series connection
Diode；
Half-bridge submodule string includes half-bridge submodule SM1~half-bridge submodule SMN, half-bridge submodule SM1~half-bridge submodule
The circuit structure all same of block SMN, for half-bridge submodule SM1~half-bridge submodule SMN, the former current output terminal successively with
The current input terminal of the latter is connected；
The anode of diode string D1 is connected with the cathode of DC low-voltage side anode and diode string D3 simultaneously, diode string D1
Cathode simultaneously be connected with the first end of the current input terminal of half-bridge submodule SM1, the anode of diode string D2 and switch S1, two
The cathode of pole pipe string D2 is connected with the second end of switch S1 and high direct voltage side anode simultaneously；
The current output terminal of half-bridge submodule SMN is connected with the first end of inductance L, the second end of inductance L simultaneously with two poles
The anode of pipe string D3, the cathode of diode string D4 are connected with the first end of switch S2, the anode of diode string D4 simultaneously with switch
The second end of S2, DC low-voltage side cathode are connected with high direct voltage side cathode；
Half-bridge submodule SM1~half-bridge submodule SMN is used to, according to corresponding half-bridge submodule drive signal, realize
Synchronous charging or electric discharge, and then between DC low-voltage side and high direct voltage side energy balance is maintained when generation power transmission.
In the present embodiment, diode string D1~diode string D4 is respectively boost charge diode string, step-up discharge two
Pole pipe string, decompression charging diode string and step-down discharge diode string, switch S1 are the by-pass switch of diode string D2, switch S2
For the by-pass switch of diode string D4.
Fig. 3 is the circuit diagram of half-bridge submodule.As shown in figure 3, half-bridge submodule includes the first wholly-controled device
IGBT1, the second wholly-controled device IGBT2 and capacitance C, the first wholly-controled device IGBT1 and the second wholly-controled device IGBT2 go here and there
Connection, capacitance C are in parallel with concatenated first wholly-controled device IGBT1 and the second wholly-controled device IGBT2.
Fig. 4 is the control principle block diagram of the DC/DC converters for flexible DC power transmission.It is detailed with reference to Fig. 4
Ground illustrates the control method of the DC/DC converters for flexible DC power transmission described in the present embodiment.
The control method includes：
Step 1: switch S1 and switch S2 is arranged according to the power transmission direction between DC low-voltage side and high direct voltage side
On off operating mode；
Step 2: the charge and discharge state of control half-bridge submodule SM1~half-bridge submodule SMN, and then in DC low-voltage side
When power transmission occurring between high direct voltage side, energy balance is maintained.
Wherein, the particular content of step 1 is：
When power is transmitted from the lateral high direct voltage side of DC low-voltage, switch S1 and switch S2 are respectively set to disconnect shape
State and on-state；
When power is transmitted from the lateral DC low-voltage side of high direct voltage, switch S1 is respectively set to connect shape with switch S2
State and off-state.
Wherein, step 2 includes：
Step 2 one generates high direct voltage side current reference signal by the way of power control；
Step 2 two adjusts DC low-voltage side current reference signal by the way of energy balance control, so that half-bridge is sub
The capacitance voltage mean value of module SM1~half-bridge submodule SMN is equal to capacitance voltage and refers to mean value；
Step 2 three carries out high direct voltage side current reference signal and the DC low-voltage side current reference signal after adjusting
Superposition, and using superposed signal as half-bridge submodule string current reference signal；
It is step 2 four, half-bridge submodule string current reference signal and the difference of half-bridge submodule string actual current signal is defeated
Enter proportional and integral controller；
Step 2 five, the half-bridge submodule string voltage control signal based on proportional and integral controller output, and use half-bridge
The mode of the control of submodule capacitor voltage balance and modulation obtains the driving letter of half-bridge submodule SM1~half-bridge submodule SMN
Number.
In practical applications, it can be obtained in such a way that the DC/DC converters described in multiphase the present embodiment is in parallel
Better current waveform quality.Fig. 5 is the circuit diagram of the derivative topological structure of three-phase DC/DC converter parallel connections.
The DC/DC converters for flexible DC power transmission described in the present embodiment have effect without configuring AC transformer
High, the small and at low cost advantage of rate.The charge and discharge of the present embodiment half-bridge submodule string are by charge and discharge diode string
It can be achieved, therefore, the component number of the DC/DC converters for flexible DC power transmission described in the present embodiment is few, power damage
Consume low, calorific value is small, the high power transmission being adapted to carry out between different voltages grade straight-flow system.
Although describing the present invention herein with reference to specific implementation, it should be understood that, these realities
It is the example of principles and applications to apply example only.It should therefore be understood that can be permitted exemplary embodiment
More modifications, and can be designed that other arrangements, spirit without departing from the present invention as defined in the appended claims and
Range.It should be understood that can be by combining different appurtenances different from method described in original claim
It is required that and feature described herein.It will also be appreciated that the feature in conjunction with described in separate embodiments can be used at it
In his embodiment.
Claims (4)
1. the DC/DC converters for flexible DC power transmission, which is characterized in that the DC/DC converters include diode string D1
~diode string D4, half-bridge submodule string, inductance L, switch S1 and switch S2；
The circuit structure all same of diode string D1~diode string D4, each diode string include multiple forward directions concatenated two
Pole pipe；
Half-bridge submodule string includes half-bridge submodule SM1~half-bridge submodule SMN, half-bridge submodule SM1~half-bridge submodule SMN
Circuit structure all same, for half-bridge submodule SM1~half-bridge submodule SMN, the former current output terminal successively with the latter
Current input terminal be connected；
The anode of diode string D1 is connected with the cathode of DC low-voltage side anode and diode string D3 simultaneously, the moon of diode string D1
Pole is connected with the first end of the current input terminal of half-bridge submodule SM1, the anode of diode string D2 and switch S1 simultaneously, diode
The cathode of string D2 is connected with the second end of switch S1 and high direct voltage side anode simultaneously；
The current output terminal of half-bridge submodule SMN is connected with the first end of inductance L, the second end of inductance L simultaneously with diode string
The anode of D3, the cathode of diode string D4 are connected with the first end of switch S2, and the anode of diode string D4 is simultaneously with switch S2's
Second end, DC low-voltage side cathode are connected with high direct voltage side cathode；
Half-bridge submodule SM1~half-bridge submodule SMN is used to, according to corresponding half-bridge submodule drive signal, realize and synchronize
Charge or discharge, and then between DC low-voltage side and high direct voltage side energy balance is maintained when generation power transmission.
2. the control method of the DC/DC converters described in claim 1 for flexible DC power transmission, which is characterized in that described
Control method includes：
Step 1: the logical of switch S1 and switch S2 is arranged according to the power transmission direction between DC low-voltage side and high direct voltage side
Disconnected state；
Step 2: the charge and discharge state of control half-bridge submodule SM1~half-bridge submodule SMN, and then in DC low-voltage side and directly
When power transmission occurs between stream high-pressure side, energy balance is maintained.
3. the control method for the DC/DC converters of flexible DC power transmission as claimed in claim 2, which is characterized in that
The particular content of step 1 is：
When power is transmitted from the lateral high direct voltage side of DC low-voltage, by switch S1 and switch S2 be respectively set to off-state with
On-state；
When power is transmitted from the lateral DC low-voltage side of high direct voltage, by switch S1 and switch S2 be respectively set to on-state with
Off-state.
4. the control method for the DC/DC converters of flexible DC power transmission as claimed in claim 3, which is characterized in that
Step 2 includes：
Step 2 one generates high direct voltage side current reference signal by the way of power control；
Step 2 two adjusts DC low-voltage side current reference signal by the way of energy balance control, so that half-bridge submodule
The capacitance voltage mean value of SM1~half-bridge submodule SMN is equal to capacitance voltage and refers to mean value；
Step 2 three folds high direct voltage side current reference signal and the DC low-voltage side current reference signal after adjusting
Add, and using superposed signal as half-bridge submodule string current reference signal；
The difference of half-bridge submodule string current reference signal and half-bridge submodule string actual current signal is inputted ratio by step 2 four
Example integral controller；
Step 2 five, the half-bridge submodule string voltage control signal based on proportional and integral controller output, and use half-bridge submodule
Block capacitor voltage balance controls and the mode of modulation, obtains the drive signal of half-bridge submodule SM1~half-bridge submodule SMN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810591730.1A CN108777544B (en) | 2018-06-08 | 2018-06-08 | DC/DC converter for flexible DC power transmission and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810591730.1A CN108777544B (en) | 2018-06-08 | 2018-06-08 | DC/DC converter for flexible DC power transmission and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108777544A true CN108777544A (en) | 2018-11-09 |
| CN108777544B CN108777544B (en) | 2020-01-14 |
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ID=64024912
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810591730.1A Active CN108777544B (en) | 2018-06-08 | 2018-06-08 | DC/DC converter for flexible DC power transmission and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109728720A (en) * | 2019-01-22 | 2019-05-07 | 哈尔滨工业大学 | Bipolar DC/DC converter and its control method for flexible DC transmission |
| CN110350788A (en) * | 2019-08-07 | 2019-10-18 | 哈尔滨工业大学 | The high power DC booster converter and its control method collected for DC boosting |
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| CN106253725A (en) * | 2016-08-24 | 2016-12-21 | 清华大学 | Be suitable to the unilateral brachium pontis blocking-up type modular multi-level converter of unidirectional trend |
| US20170307688A1 (en) * | 2014-09-22 | 2017-10-26 | General Electric Technology Gmbh | Synthetic test circuit |
| CN107370365A (en) * | 2017-08-02 | 2017-11-21 | 哈尔滨工业大学 | D.C. high voltage transmission DC DC converters and the method that voltage discharge and recharge is realized using the converter |
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| US20170307688A1 (en) * | 2014-09-22 | 2017-10-26 | General Electric Technology Gmbh | Synthetic test circuit |
| US9525348B1 (en) * | 2015-07-31 | 2016-12-20 | Abb Schweiz Ag | Power converter having integrated capacitor-blocked transistor cells |
| CN105576982A (en) * | 2016-02-02 | 2016-05-11 | 上海交通大学 | Non-isolated DC transformer |
| CN106253725A (en) * | 2016-08-24 | 2016-12-21 | 清华大学 | Be suitable to the unilateral brachium pontis blocking-up type modular multi-level converter of unidirectional trend |
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| CN109728720A (en) * | 2019-01-22 | 2019-05-07 | 哈尔滨工业大学 | Bipolar DC/DC converter and its control method for flexible DC transmission |
| CN110350788A (en) * | 2019-08-07 | 2019-10-18 | 哈尔滨工业大学 | The high power DC booster converter and its control method collected for DC boosting |
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|---|---|
| CN108777544B (en) | 2020-01-14 |
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