CN106921155A - The control method of DC bipolar electric power system Voltage unbalance - Google Patents
The control method of DC bipolar electric power system Voltage unbalance Download PDFInfo
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- CN106921155A CN106921155A CN201710142742.1A CN201710142742A CN106921155A CN 106921155 A CN106921155 A CN 106921155A CN 201710142742 A CN201710142742 A CN 201710142742A CN 106921155 A CN106921155 A CN 106921155A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000007935 neutral effect Effects 0.000 claims abstract description 44
- 238000002955 isolation Methods 0.000 claims description 13
- 230000010363 phase shift Effects 0.000 claims description 11
- 239000004020 conductor Substances 0.000 claims description 9
- 238000000205 computational method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000000116 mitigating effect Effects 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- 241001125818 Limanda limanda Species 0.000 description 1
- 125000002015 acyclic group Chemical group 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/06—Two-wire systems
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
A kind of control method of DC bipolar electric power system Voltage unbalance, it is as compensation using double active full-bridge current transformers, by in compensator parallel connection line attachment, neutral current is compensated into positive and negative polarities circuit respectively, so that neutral current remains null value, so as to reduce the total losses of bipolar DC microgrids circuit.The present invention can effectively mitigate the voltage imbalance question of DC bipolar electric power system by reducing neutral current, and then effectively reduce total line loss.The inventive method need not be additionally provided power supply, so do not consume that electric energy is not also provided, only comprising a small amount of transducer loss.The analytical expression of compensator controlled quentity controlled variable of the invention is succinct, is easy to actual motion.
Description
Technical field
The present invention relates to direct-current grid, DC bipolar electric power system, particularly a kind of DC bipolar electric power system voltage
Unbalanced control method.
Background technology
Because the power electronics switching stage in direct-current micro-grid is less, reliability and stability are higher, receive more and more
Concern.Usual direct-current micro-grid has two kinds of structures, is respectively acyclic type and bipolar system.Bipolar structure has efficiency high, reliability
Property the strong and good advantage of flexibility.By taking 48V bipolar system direct-current micro-grids as an example, low rated voltage load and low-power consumption load can be even
24V is connected to, and the load of rated voltage close to 48V can be connected to 48V sides.Additionally, in bipolar network, even if a circuit event
Barrier, it is also possible to the continuity of bearing power is maintained using other two lines roads of bipolar power network.But in bipolar system direct-current micro-grid
In, more distinctive is due to the two poles of the earth voltage imbalance question caused by load skewness.There is scholar to propose solution party
Case, design circuit balances DC voltage by absorbing and providing the method for electric energy.Certain one end of their often balance microgrids
The voltage of mouth, however, existing method can not eliminate the neutral current of the bipolar system direct-flow distribution system with feeder line long, from
And cause feeder line uneven.
Double active full-bridge current transformer (Dual Active Bridge-Isolated based on Phase Shift Control Study
Bidirectional DC/DC Converter, DAB) have that power density is high, dynamic response fast, easily realize Sofe Switch, work(
It is the advantages of rate energy two-way flow, very popular in occasions such as uninterrupted power source, electric automobile, solid-state transformers.Common DAB becomes
Stream device control mode is phase shifting control, and the voltage with relative phase shift is produced in the primary side port of high frequency transformer and secondary port
Square wave, while by the relative phase shift for controlling two full-bridge circuit diagonally opposing corner switching devices of primary and secondary side to drive, changing voltage
The dutycycle of square wave, so as to adjust the electric current for flowing through current transformer.In bipolar system direct-current micro-grid rationally by the use of the current transformer as
Compensator, can play the effect for mitigating voltage imbalance question.
The content of the invention
Regarding to the issue above, it is an object of the invention to provide a kind of controlling party of DC bipolar electric power system Voltage unbalance
Method.Using double active full-bridge current transformer (Dual Active Bridge-Isolated Bidirectional DC/DC
Converter) DC bipolar electric power system Voltage unbalance is mitigated.
Technical solution of the invention is as follows：
A kind of control method of DC bipolar electric power system Voltage unbalance, its feature is that the method includes following step
Suddenly：
1) double active full-bridge current transformers, this pair of active full-bridge unsteady flow are added before any load of DC bipolar electric power system
Device includes primary side single-phase full bridge, secondary single-phase full bridge, high-frequency isolation transformer, a high-frequency inductor and a closed loop controller group
Into described closed loop controller includes that the comparator, PI controllers and the modulating unit that are sequentially connected are constituted, and described primary side is single-phase
The full control switching device of 4 of full-bridge is S1~S4, 4 full control switching devices of described secondary single-phase full bridge are Q1~Q4；It is described
The positive pole of dc bus of primary side single-phase full bridge be connected with the positive pole of DC bipolar electric power system load-side, primary side single-phase full bridge
The negative pole of dc bus be connected with the neutral conductor of bipolar electric power system load-side, primary side single-phase full bridge AC by inductance with
The primary side of high-frequency isolation transformer is connected；The positive pole of the dc bus of described secondary single-phase full bridge and DC bipolar electric power system
The neutral conductor of load-side is connected, the negative pole phase of the negative pole of the dc bus of secondary single-phase full bridge and bipolar electric power system load-side
Even, secondary single-phase full bridge AC is connected by the secondary of described high-frequency isolation transformer；Described high-frequency isolation transformer
No-load voltage ratio be 1:1；The derailing switch of the output end of the corresponding switching signal of described modulating unit and described primary side single-phase full bridge
Part S1~S4With the switching device Q of secondary single-phase full bridge1~Q4Control signal input be connected DC bipolar electric power system source
Side neutral current reference value IrefIt is 0；
2) the neutral current I of DC bipolar electric power system source is measuredSn, as the neutral current I of sourceSnWhen=0,
It is transferred to step 5), otherwise into next step；
3) by source neutral current ISnWith given neutral current reference value IrefDifference e is exported through described comparator,
The phase shift is calculated by following formula compare controlled quentity controlled variable：
d0=kp·(Iref-ISn)+ki·∫(Iref-ISn)dt (1)
Wherein, kp、kiThe respectively ratio of PI controllers, integral coefficient；
4) the PI controllers described in export phase shift than controlled quentity controlled variable d0, through the described double active full-bridge unsteady flows of modulating unit output
The control signal of each switch of device, makes described double active full-bridge current transformer export corresponding compensation current：Described compensation
The current value I of device primary side positive pole outflowcp+, the current value I that described compensator primary side negative pole flows outcp-, described compensator pair
The current value I of side negative pole outflowcs-；The current value I of described compensator secondary positive pole outflowcs+, make described bipolar power supply system
The neutral current I of system sourceSnTend to null value；Return to step 2)；
Described compensation current can be calculated in accordance with the following steps：
The logical relation of branch current each first can be analyzed as follows：
ISn=ILn'-Icp-=ILn-Ics+-Icp- (2)
Wherein, ILn’To flow stage casing current value of the bipolar electric power system neutral conductor from current transformer secondary to current transformer primary side, ILn
It is the neutral current value of DC bipolar electric power system load-side, Icp-It is the current value of described compensator primary side negative pole inflow,
Ics+It is the current value of described compensator secondary positive pole inflow, makes ISn=0, then need to meet：
Ics++Icp-=ILn (3)
From the structure of described compensator, the negative pole inflow current of primary side single-phase full bridge is equal to positive pole and flows out electric current,
The positive pole inflow current of secondary single-phase full bridge is equal to negative pole and flows out electric current, i.e.,：
Wherein, Icp+It is the current value of described compensator primary side positive pole outflow, Ics-It is described compensator secondary negative pole
The current value of outflow；
DC bipolar electric power system load-side both positive and negative polarity magnitude of voltage should be equal under stable case, i.e. compensator original secondary port
Magnitude of voltage it is equal, the former secondary no-load voltage ratio of described high-frequency isolation transformer is 1:1, its port current logical relation is：
Icp+=Icp-=Ics+=Ics- (5)
During formula (5) substitutes into (3), the compensation current phase of described current transformer primary side both positive and negative polarity and secondary both positive and negative polarity will be drawn
Deng, and the neutral current value for DC bipolar electric power system load-side half：
Further, the maximum that compensator compensates electric current can be calculated：
By double active full-bridge current transformer transimission powers：
Wherein, V1It is the input voltage of compensator, V2It is the output voltage of compensator, high-frequency isolation transformer no-load voltage ratio n=1,
Fs is converter switches frequency, and L is inductance value, d in compensator0It is the controlled quentity controlled variable of compensator, span is：
Substitution formula (7), the maximum for obtaining the compensation electric current of compensator is：
Wherein, V is the cathode voltage of DC bipolar electric power system source, IS+It is the positive pole of DC bipolar electric power system source
Current value, R is line resistance value of the source to load-side.
Further, the DC bipolar electric power system line loss value before and after compensation can be compared.
DC bipolar electric power system can be with shown in following formula via the total line loss before compensation：
Wherein, ILnIt is the neutral current value of DC bipolar electric power system load-side, IL+It is load-side positive pole current value,
IL- it is load-side negative electricity flow valuve.
After compensation, the electric current of the neutral conductor is reduced to zero, and electrode line and negative pole line current are reducedTherefore, after compensation
Total line loss is shown below：
Wushu (10) is brought into (11), and by KCL laws, obtains：
ILn=IL++IL- (12)
By formula (13) as can be seen that through overcompensation, total line loss is reduced.
Further, because DC bipolar electric power system can be carried along tape, and every section of load can all influence both positive and negative polarity electricity
Pressure, load distribution inequality can cause both positive and negative polarity Voltage unbalance, more long for feeder line if only being compensated in feeder terminal
Situation, it is likely to cause imbalance along line voltage.Can be by compensation scheme segmented compensation to the DC line, segmentation insertion is mended
Repay device, for i-th load node circuit in, before compensation：
The positive and negative pole tension of i+1 load node can be expressed as follows：
If as can be seen that positive pole and cathodal current can not cancel out each other, neutral current will be produced.Both positive and negative polarity is loaded
The bigger neutral current of difference also can be bigger, and neutral current amplitude is bigger, and positive and negative polarities voltage difference also can be bigger.
After embedded compensator, the compensation electric current of compensator is：
After compensation, neutral current ILn,iIt is zero, positive and negative electrode current is cancelled out each other, this section of positive and negative pole tension keeps balance.
Compared with prior art, the features of the present invention is as follows：
1. the inventive method can effectively mitigate the Voltage unbalance of DC bipolar electric power system by reducing neutral current
Problem, and then effectively reduce total line loss.
2. the inventive method need not be additionally provided power supply, so do not consume also not providing electric energy, only turn comprising a small amount of
Parallel operation is lost.
3. the analytical expression of compensator controlled quentity controlled variable of the invention is succinct, is easy to actual motion.
Brief description of the drawings
Fig. 1 is the structure chart of the control circuit of DC bipolar electric power system Voltage unbalance of the present invention.
Fig. 2 is the cut-away view of double active full-bridge compensators
Fig. 3 is double active full-bridge compensator drive signal timing diagrams and former secondary alternating voltage current waveform figure
Fig. 4 is the computational methods step of controller of the invention.
Specific embodiment
With reference to embodiment and accompanying drawing, the invention will be further described, but should not limit protection model of the invention with this
Enclose.
Fig. 1, Fig. 2 are first referred to, Fig. 1 is mitigation DC bipolar electric power system of the present invention based on double active full-bridge current transformers
The control circuit structure diagram of Voltage unbalance, Fig. 2 is double active full-bridge compensator cut-away views.The double active full-bridge compensation of Fig. 3
Device drive signal timing diagram and former secondary alternating voltage current waveform figure, Fig. 4 is the computational methods step of controller of the invention.
As seen from the figure, the control method of DC bipolar electric power system Voltage unbalance of the present invention, comprises the following steps：
1) double active full-bridge current transformers, this pair of active full-bridge unsteady flow are added before any load of DC bipolar electric power system
Device includes primary side single-phase full bridge H1, secondary single-phase full bridge H2, high-frequency isolation transformer, a high-frequency inductor L and a closed-loop control
Device is constituted, and described closed loop controller includes that the comparator, PI controllers and the modulating unit that are sequentially connected are constituted, described primary side
The full control switching device of 4 of single-phase full bridge is S1~S4, 4 full control switching devices of described secondary single-phase full bridge are Q1~Q4；
The positive pole of the dc bus of described primary side single-phase full bridge is connected with the positive pole of DC bipolar electric power system load-side, and primary side is single-phase
The negative pole of the dc bus of full-bridge is connected with the neutral conductor of bipolar electric power system load-side, and primary side single-phase full bridge AC is by electricity
Sense L is connected with the primary side of high-frequency isolation transformer；The positive pole of the dc bus of described secondary single-phase full bridge is supplied with DC bipolar
The neutral conductor of electric system load-side is connected, and the negative pole of the dc bus of secondary single-phase full bridge is negative with bipolar electric power system load-side
Extremely it is connected, secondary single-phase full bridge AC is connected by the secondary of described high-frequency isolation transformer；Described high-frequency isolation becomes
The no-load voltage ratio of depressor is 1:1；The output end of the corresponding switching signal of described modulating unit is opened with described primary side single-phase full bridge
Close device S1~S4With the switching device Q of secondary single-phase full bridge1~Q4Control signal input be connected, DC bipolar is powered
System source neutral current reference value IrefIt is 0；
2) the neutral current I of DC bipolar electric power system source is measuredSn, as the neutral current I of sourceSnWhen=0,
It is transferred to step 5), otherwise into next step；
3) by source neutral current ISnWith given neutral current reference value IrefDifference e is exported through described comparator,
The phase shift is calculated than controlled quentity controlled variable d by formula (1)0：4) the PI controllers described in export phase shift than controlled quentity controlled variable d0, through described modulation
The control signal of each switch of the double active full-bridge current transformers of unit output, makes described double active full-bridge current transformer output corresponding
Compensation current：The current value I of described compensator primary side positive pole outflowcp+, the electric current that described compensator primary side negative pole flows out
Value Icp-, the current value I that described compensator secondary negative pole flows outcs-；The current value of described compensator secondary positive pole outflow
Ics+, make the neutral current I of described bipolar electric power system sourceSnTend to null value；Return to step 2)；
Computational methods are implemented as follows：
1) detection DC bipolar electric power system source neutral current ISn。
2) PI controllers are designed, control parameter is set, closed loop is carried out to electric current, by ISnControl in null value, by closed-loop control
It draws phase shift than controlled quentity controlled variable d0, d can be calculated according to formula (1)0Value.
3) phase shift is than controlled quentity controlled variable d0The switch letter of the modulated double active each full control switching devices of full-bridge current transformer of unit output
Number, each switch controlling signal S1~S4, Q1~Q4, and original edge voltage signal vp, secondary voltage signal vs, primary current signal iL
Waveform it is as shown in Figure 3.
4) DC bipolar is powered by four branch roads of double active full-bridge current transformer primary side both positive and negative polarities and secondary both positive and negative polarity and is
The system neutral conductor and positive and negative electrode current are adjusted, and neutral current are compensated into positive and negative polarities circuit respectively, so that neutral
Line current value is maintained at null value.
The neutral current value I of DC bipolar electric power system load-side is drawn by formula (2) (3) (4) (5) analysisLnAnd compensation
The fast port current I of device original secondary single-phase full bridge mouldcp+、Icp-、Ics+、Ics-Mutual logical relation.
The compensation current of compensator is derived by formula (6).
Double active full-bridge current transformer transimission powers are calculated according to formula (7), and derives formula (9) for compensator can be compensated
Maximum current value.
System bus damage value before compensation is calculated by formula (10), the system bus damage value after compensation is calculated by formula (11), by
(13) compare before must being less than compensation through the line loss after overcompensation.
When feeder line is more long, sectional insertion compensator, principle is similar to unistage type, and every section of compensation current can
Calculated according to formula (15).
Experiment shows：
1. the inventive method can effectively mitigate the Voltage unbalance of DC bipolar electric power system by reducing neutral current
Problem, and then effectively reduce total line loss.
2. the inventive method need not be additionally provided power supply, so do not consume also not providing electric energy, only turn comprising a small amount of
Parallel operation is lost.
3. the analytical expression of compensator controlled quentity controlled variable of the invention is succinct, is easy to actual motion.
Claims (1)
1. a kind of control method of DC bipolar electric power system Voltage unbalance, it is characterised in that the method comprises the following steps：
1) double active full-bridge current transformers, this pair of active full-bridge current transformer bag are added before any load of DC bipolar electric power system
Include primary side single-phase full bridge (H1), secondary single-phase full bridge (H2), high-frequency isolation transformer, a high-frequency inductor (L) and a closed loop control
Device composition processed, described closed loop controller includes that the comparator, PI controllers and the modulating unit that are sequentially connected are constituted, described original
The full control switching device of 4 of side single-phase full bridge is S1~S4, 4 full control switching devices of described secondary single-phase full bridge are Q1~
Q4；The positive pole of the dc bus of described primary side single-phase full bridge is connected with the positive pole of DC bipolar electric power system load-side, primary side
The negative pole of the dc bus of single-phase full bridge is connected with the neutral conductor of bipolar electric power system load-side, and primary side single-phase full bridge AC leads to
Inductance (L) is crossed to be connected with the primary side of high-frequency isolation transformer；The positive pole and direct current of the dc bus of described secondary single-phase full bridge
The neutral conductor of bipolar electric power system load-side is connected, and the negative pole of the dc bus of secondary single-phase full bridge is loaded with bipolar electric power system
The negative pole of side is connected, and secondary single-phase full bridge AC is connected by the secondary of described high-frequency isolation transformer；Described high frequency
The no-load voltage ratio of isolating transformer is 1:1；The output end of the corresponding switching signal of described modulating unit is single-phase with described primary side complete
The switching device S of bridge1~S4With the switching device Q of secondary single-phase full bridge1~Q4The input of control signal be connected, direct current is double
Pole electric power system source neutral current reference value IrefIt is 0；
2) the neutral current I of DC bipolar electric power system source is measuredSn, as the neutral current I of sourceSnWhen=0, step is transferred to
It is rapid 5), otherwise into next step；
3) by source neutral current ISnWith given neutral current reference value IrefDifference e is exported through described comparator, is passed through
Following formula calculate the phase shift and compare controlled quentity controlled variable：
d0=kp·(Iref-ISn)+ki·∫(Iref-ISn)dt (1)
Wherein, kp、kiThe respectively ratio of PI controllers, integral coefficient；
4) the PI controllers described in export phase shift than controlled quentity controlled variable d0, through the described double active full-bridge current transformers of modulating unit output
The control signal of each switch, makes described double active full-bridge current transformer export corresponding compensation current：Described compensator is former
The current value I of side positive pole outflowcp+, the current value I that described compensator primary side negative pole flows outcp-, described compensator secondary bears
The current value I of pole outflowcs-；The current value I of described compensator secondary positive pole outflowcs+, make described bipolar electric power system source
The neutral current I of sideSnTend to null value；Return to step 2).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110045733A (en) * | 2019-04-04 | 2019-07-23 | 肖卫国 | A kind of real-time location method and its system, computer-readable medium |
| CN110167233A (en) * | 2019-06-10 | 2019-08-23 | 马化盛 | A kind of direct current supply distribution structure |
| CN111433995A (en) * | 2017-10-06 | 2020-07-17 | 通用电器技术有限公司 | Converter scheme |
| CN111641202A (en) * | 2020-05-28 | 2020-09-08 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Ground electrode current limiting method and system based on closed-loop control |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516221A (en) * | 2013-10-10 | 2014-01-15 | 清华大学 | Bi-direction direct-current solid-state transformer with high-frequency alternating-current isolation link |
| CN104065287A (en) * | 2014-05-30 | 2014-09-24 | 许继电气股份有限公司 | Balance control method for voltage source type symmetric bipolar converters |
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2017
- 2017-03-10 CN CN201710142742.1A patent/CN106921155B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516221A (en) * | 2013-10-10 | 2014-01-15 | 清华大学 | Bi-direction direct-current solid-state transformer with high-frequency alternating-current isolation link |
| CN104065287A (en) * | 2014-05-30 | 2014-09-24 | 许继电气股份有限公司 | Balance control method for voltage source type symmetric bipolar converters |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111433995A (en) * | 2017-10-06 | 2020-07-17 | 通用电器技术有限公司 | Converter scheme |
| CN111433995B (en) * | 2017-10-06 | 2023-08-29 | 通用电器技术有限公司 | converter structure |
| CN110045733A (en) * | 2019-04-04 | 2019-07-23 | 肖卫国 | A kind of real-time location method and its system, computer-readable medium |
| CN110167233A (en) * | 2019-06-10 | 2019-08-23 | 马化盛 | A kind of direct current supply distribution structure |
| CN111641202A (en) * | 2020-05-28 | 2020-09-08 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Ground electrode current limiting method and system based on closed-loop control |
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| CN106921155B (en) | 2019-04-05 |
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