CN106655238A - Combined current converter and internal DC voltage balance control method thereof - Google Patents
Combined current converter and internal DC voltage balance control method thereof Download PDFInfo
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- CN106655238A CN106655238A CN201710010657.XA CN201710010657A CN106655238A CN 106655238 A CN106655238 A CN 106655238A CN 201710010657 A CN201710010657 A CN 201710010657A CN 106655238 A CN106655238 A CN 106655238A
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J1/10—Parallel operation of dc sources
- H02J1/102—Parallel operation of dc sources being switching converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention provides a combined current converter and an internal DC voltage balance control method thereof. A DC voltage deviation controller is added into a control system of each basic current conversion unit; and each DC voltage deviation controller regards the average value of the real-time DC voltages of the each basic current conversion unit as reference and superposes the control output quantity of the DC voltage deviation controller to an active control channel of the corresponding basic current conversion unit. The DC voltage is controlled to be close to the real-time DC voltage average values of all the basic current conversion units, so that the unbalance problem of the DC voltage between the serially connected basic current conversion units inside the combined current converter is solved efficiently, DC voltage balance and power uniform distribution of each basic current conversion unit during the stable runtime is realized, and the running stability and reliability of the combined current converter is improved greatly.
Description
Technical field
The invention belongs to transmission ＆ distribution electro-technical field, and in particular to one kind combination transverter and its balanced control of internal dc voltage
Method processed.
Background technology
With the update of the fast-developing and Power Electronic Technique of modern power network, based on modularization multi-level converter
The flexible direct current power transmission system of (Modular Multilevel Converter, MMC) technology achieves rapid progress, and progressively
Realize engineer applied.But relative to Traditional DC transmission system (also known as line commutation transverter HVDC transmission system,
Line Commutated Converter Based High Voltage Direct Current, LCC-HVDC), its voltage
Grade and transmission capacity await further lifting.
It is pressure limited due to single IGBT, in the occasion for voltage levels, generally require substantial amounts of submodule string
Connection, this causes very big burden to the detection and control of transverter.Use for reference the high voltage power transmisson system of Traditional DC transmission system
Topological structure, using MMC transverters as basic convertor unit, using the matrix form combination of transverter high-voltage large-capacity can be realized
Requirement, i.e., transmission capacity is improved by the in parallel of basic convertor unit, conveying electricity is improved by the series connection of basic convertor unit
Pressure grade, forms combination transverter, effectively improves the power capacity and electric pressure of flexible direct current power transmission system.
However, for basic convertor unit is connected the combination transverter to be formed, determine direct current pressure side and transport in inversion wherein non-
During row, the basic convertor unit of combination inverter inside is time-dependent system, there are problems that DC voltage is unbalanced, or even has and send out
Scattered risk.In order to meet normal operation demand, it is necessary to take extra control strategy to maintain basic convertor unit direct current
The equilibrium of voltage.
The content of the invention
It is an object of the invention to provide a kind of combination transverter and its internal dc voltage balance control method, to solve
The unbalanced problem of DC voltage between the basic convertor unit of combination inverter inside series connection.
To solve above-mentioned technical problem, the technical scheme is that：
The present invention provides a kind of combination inverter inside DC voltage balance control method, including following method scheme：
Method scheme one, adds a DC voltage error method in the control system of each basic convertor unit
Device, the DC voltage error method device, and will be described on the basis of the mean value of the real-time DC voltage of basic convertor unit
The controlled output amount of DC voltage error method device is added on the real power control passage of the basic convertor unit of correspondence.
Method scheme two, on the basis of method scheme one, the DC voltage error method device includes high limit controller,
Closed-loop control is carried out after the high limit reference voltage of high limit controller is made the difference with the real-time DC voltage of basic convertor unit, is obtained
High limit closed-loop control output quantity, the high limit closed-loop control output quantity is the controlled output amount of DC voltage error method device；Its
In, the high limit reference voltage is K_up times of the real-time DC voltage average value of basic convertor unit, and K_up is more than 1.
Method scheme three, on the basis of method scheme one, the DC voltage error method device includes lower bound controller,
Closed-loop control is carried out after the lower bound reference voltage of lower bound controller is made the difference with the real-time DC voltage of basic convertor unit, is obtained
Lower bound closed-loop control output quantity, the lower bound closed-loop control output quantity is the controlled output amount of DC voltage error method device；Its
In, the lower bound reference voltage is K_low times of the real-time DC voltage average value of basic convertor unit, and K_low is less than 1.
Method scheme four, on the basis of method scheme one, the DC voltage error method device includes high limit controller
With lower bound controller, carry out after the lower bound reference voltage of lower bound controller is made the difference with the real-time DC voltage of basic convertor unit
Closed-loop control, obtains lower bound closed-loop control output quantity；By the reality of the high lower bound reference voltage and basic convertor unit for limiting controller
When DC voltage make the difference after carry out closed-loop control, obtain high limit closed-loop control output quantity；Lower bound closed-loop control output quantity and high limit
The result that closed-loop control output quantity is added is the controlled output amount of DC voltage error method device；Wherein, the lower bound is with reference to electricity
Press the real-time DC voltage average value for basic convertor unit K_low times, K_low is less than 1, and high limit reference voltage is to change substantially
K_up times of the real-time DC voltage average value of stream unit, K_up is more than 1.
Method scheme five, six, seven, eight, respectively in method scheme one, method scheme two, method scheme three, method scheme four
On the basis of, the real power control passage is to adopt determine the outer shroud active power controller passage of power cutting-in control, adopt fixed electricity
The watt current control passage of stream cutting-in control adopts the control passage corresponding with frequency for determining the control of alternating voltage isolated island.
The present invention also provides a kind of combination transverter, including following transverter scheme：
Transverter scheme one, each basic convertor unit of the combination transverter includes corresponding DC voltage deviation control
Device processed, is superimposed with the controlled output of correspondence DC voltage error method device on the real power control passage of each basic convertor unit
Amount, the DC voltage error method device is on the basis of the mean value of the real-time DC voltage of basic convertor unit.
Transverter scheme two, on the basis of transverter scheme one, the DC voltage error method device includes high limit control
Device processed, the controlled output amount of the DC voltage error method device is high limit closed-loop control output quantity, high limit closed-loop control
Output quantity is to carry out closed loop control after the high limit reference voltage of high limit controller makes the difference with the real-time DC voltage of basic convertor unit
The result being obtained, high limit the real-time DC voltage average value that reference voltage is basic convertor unit K_up times, K_up
More than 1.
Transverter scheme three, on the basis of transverter scheme one, the DC voltage error method device includes lower bound control
Device processed, the controlled output amount of the DC voltage error method device is lower bound closed-loop control output quantity, the lower bound closed-loop control
Output quantity carries out closed loop control after making the difference with the real-time DC voltage of basic convertor unit for the lower bound reference voltage of lower bound controller
The result obtained after system, the lower bound reference voltage is K_low times of the real-time DC voltage average value of basic convertor unit, K_
Low is less than 1.
Transverter scheme four, on the basis of transverter scheme one, the DC voltage error method device includes high limit control
Device processed and lower bound controller, the controlled output amount of the DC voltage error method device is high limit closed-loop control output quantity and lower bound
The result that closed-loop control output quantity is added, the high limit closed-loop control output quantity is high limit reference voltage and basic convertor unit
In real time DC voltage carries out the result obtained after closed-loop control after making the difference, and the lower bound closed-loop control output quantity is lower bound with reference to electricity
Pressure carries out the result obtained after closed-loop control, the high limit reference voltage after making the difference with the real-time DC voltage of basic convertor unit
For K_up times of the real-time DC voltage average value of basic convertor unit, the lower bound reference voltage is the reality of basic convertor unit
When K_low times of DC voltage average value, K_up is less than 1 more than 1, K_low.
Transverter scheme five, six, seven, eight, respectively in transverter scheme one, transverter scheme two, transverter scheme three, change
On the basis of stream device scheme four, the real power control passage is to be led to using the outer shroud active power controller for determining power cutting-in control
Road, employing determine the watt current control passage of electric current cutting-in control or adopt to determine the corresponding with frequency of alternating voltage isolated island control
Control passage.
Beneficial effects of the present invention：
The present invention by determine power or determine electric current, the basic convertor unit of determining alternating voltage current conversion station is controlled strategy
Transformation, the control of the DC voltage error method device on the basis of the mean value of the real-time DC voltage of basic convertor unit is defeated
Output is added on the real power control passage of the basic convertor unit of correspondence, by DC voltage control in all basic convertor unit realities
When DC voltage average value near, so as to efficiently solve it is original determine power or determine electric current, determine in alternating voltage current conversion station due to
The unbalanced problem of DC voltage caused by parameter and control otherness between basic convertor unit.
The present invention realizes the DC voltage equilibrium between each basic convertor unit and power-sharing during steady-state operation, is greatly improved
The operation stability and reliability of combination transverter.
Description of the drawings
Fig. 1 is a kind of combination transverter topological structure schematic diagram；
Fig. 2 is DC voltage error method device schematic diagram；
Fig. 3 is shown using the basic convertor unit power outer loop control method of grid-connected combination inverter inside of constant dc power control
It is intended to；
Fig. 4 is using the basic convertor unit controlling party of passive power supply combination inverter inside for determining the control of alternating voltage isolated island
Method schematic diagram；
Fig. 5 is the DC voltage error method device schematic diagram without high lower bound.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is right below in conjunction with drawings and Examples
The present invention is described in further detail, but embodiments of the present invention not limited to this.
A kind of combination transverter topological structure schematic diagram is illustrated in figure 1, wherein, UdcTo combine transverter entirety direct current
Pressure；IdcTo combine transverter entirety DC current；MMC1,MMC2,...,MMCNTo combine the N number of basic change of current of inverter inside
Unit；Udc1,Udc2,...,UdcNCombination inverter inside MMC is corresponded to respectively1,MMC2,...,MMCNN number of basic convertor unit
DC voltage.
Transverter is combined in the present invention by N number of basic convertor unit MMCk(k=1,2 ..., N) series boosting is constituted, and is adopted
Modularization multi-level converter (Modular Multilevel Converter, MMC) or its parallel combination are used as the basic change of current
Unit.But the present invention is not limited, used as basic convertor unit, such as two is electric for the transverter that still can be taken other form
Flat or three-level converter etc..
The DC voltage error method device schematic diagram of the present invention is illustrated in figure 2, in each base of combination inverter inside
A DC voltage error method device, the controlled output of DC voltage error method device are added in the control system of this convertor unit
Amount is added on the real power control instruction path of the basic convertor unit of correspondence.Wherein, DC voltage error method device is by direct current
The high limit controller of pressure and DC voltage lower bound controller composition.
Wherein：
Udck--- the real-time DC voltage of k-th convertor unit；
Udc_Href--- the high limit reference voltage of high limit controller；
Udc_Lref--- the lower bound reference voltage of lower bound controller；
K_up --- high limit controls the proportionality coefficient of reference value and real-time mean value；
K_low --- lower bound controls the proportionality coefficient of reference value and real-time mean value；
Refk--- controlled output amount.
The high voltage limit reference value of high limit controller and the lower bound voltage reference value of lower bound controller are all combination transverter
The real-time DC voltage average value U of internal all basic convertor unitsdc_av, i.e.,：
The high limit reference voltage U of high limit controllerdc_HrefFor Udc_av× K_up, COEFFICIENT K _ up are slightly larger than 1；Voltage deviation control
The lower bound reference voltage U of lower bound controller in device processeddc_LrefFor Udc_av× K_low, COEFFICIENT K _ low is slightly less than 1.High limit controller
After controlling respectively through closed loop PI with lower bound controller, after high limit closed-loop control output quantity is added with lower bound closed-loop control output quantity
Obtain controlled output amount Refk。
Specifically：
The bottoming of the high output upper limit for limiting controller of DC voltage and DC voltage lower bound controller is counter each other to be counted,
Zero is all taken as in the present embodiment, when the DC voltage of convertor unit is near the mean value of all convertor unit DC voltages,
When i.e. the DC voltage is instructed and instructed more than lower bound less than high limit, saturation on the high limit controller of DC voltage, direct current is forced down
Saturation under limit controller, the two output result is cancelled out each other, and the output of deviation controller does not affect active power controller.
When DC voltage appearance is abnormal, after instructing more than the instruction of high limit or less than lower bound, height limits controller or lower bound control
The output result of device no longer saturation, the two output result will change the active power of convertor unit, finally control basic change of current list
DC voltage reaches basis equalization between unit.
Illustrate how above-mentioned voltage deviation controller operates with reference to specific combination transverter mode of operation.
For example：As shown in figure 3, voltage deviation controller is applied under cutting-in control pattern, the control method includes straight
Stream voltage deviation control, the control of active power outer shroud.The controlled output amount of voltage deviation controller is added to active power outer shroud
On.
Wherein：
Pk_ref--- the active power instruction of k-th convertor unit；
Pk_fdb--- the active power feedback of k-th convertor unit；
idk_ref--- the watt current instruction of k-th convertor unit.
DC voltage error method：
The reference value of high limit controller is the real-time direct current of all basic convertor units in DC voltage error method device
Flatten average Udc_avCertain COEFFICIENT K _ up slightly larger than 1 is multiplied by, 1.005 are taken as in the present embodiment；In DC voltage error method device
The reference value of lower bound controller is the real-time DC voltage average value U of all basic convertor unitsdc_avIt is multiplied by certain and is slightly less than 1 and is
Number K_low, is taken as 0.995 in this example.High limit controller and lower bound controller are real-time straight with corresponding basic convertor unit respectively
Stream voltage carries out PI closed-loop controls after making the difference, and obtains high limit controlled output amount and lower bound controlled output amount, after the two is added
To controlled output amount Refk。
Power outer shroud is controlled：
According to system requirements, active power instruction P is setk_ref, while instructing P in active powerk_refUpper superposing control is defeated
Output Refk, through Active Power Controller, generate the instruction i of current inner loopdk_ref, then through the ring such as current inner loop and modulation
Section finally gives the drive signal of transverter.
In addition, under grid-connect mode, the controlled output amount of DC voltage error method device can also be added to using fixed
In the watt current control passage of electric current cutting-in control, DC current control is similar to the power ring control shown in Fig. 3, and here is not
It is specifically described again.
And for example, as shown in figure 4, DC voltage error method device is used under passive power supply control pattern, the controlling party
Method includes DC voltage error method, the control of alternating voltage outer shroud, current inner loop control and frequency reference generating portion.Direct current
The controlled output amount of voltage deviation controller is added in control passage corresponding with frequency.
The outer shroud control that differs only in of the control method control method for using corresponding with Fig. 3 is generated with frequency reference
Method is different, and the remainder control method for using corresponding with Fig. 3 is identical, thus herein to avoid repeated description, only provides friendship
The control of stream outer voltage and frequency reference generating mode, the detailed description of remaining control refers to the control that Fig. 3 correspondences are used
Method processed.
Wherein：
Uack_ref--- the alternating voltage instruction of k-th convertor unit；
Uack_d--- the alternating voltage value of feedback d axle component of k-th convertor unit；
Uack_q--- the alternating voltage value of feedback q axle component of k-th convertor unit；
idk_ref--- the watt current instruction of k-th convertor unit；
iqk_ref--- the referenced reactive current of k-th convertor unit；
idk--- the watt current value of feedback of k-th convertor unit；
iqk--- the reactive current value of feedback of k-th convertor unit；
f0--- reference frequency reference value；
θ --- output voltage fixed phase.
Alternating voltage outer shroud is controlled：
According to system requirements, alternating voltage instruction U is setack_refAs the d axle reference inputs under rotating coordinate system, if
It is zero to put q axle reference inputs；Then respectively with combine d axle and q shaft voltage of the transverter alternating voltage under rotating coordinate system
Feed back to component Uac_d、Uac_qAfter making the difference, respectively through PI controllers, closed-loop control is done, watt current instruction is generated respectively
idk_refWith referenced reactive current iqk_ref。
Frequency reference is generated：
By output quantity Ref processed of convertor unitk(k=1,2 ..., N) it is superimposed upon fixed frequency values f0(generally 50Hz)
On, as frequency reference fref, then by frefIt is transformed to output voltage fixed phase θ.
Wherein, DC voltage error method device is with the mean value of the real-time DC voltage of basic convertor unit as base
It is accurate --- it is the real-time DC voltage value of basic convertor unit to be controlled near mean value to control purpose, and figure 3 above, Fig. 4 give
What is gone out is a kind of DC voltage error method device with the control of high lower bound, as other embodiments, be may also be using such as Fig. 5
Shown controller, is without high lower bound controller.Wherein, Udc_avTo combine the straight of the N number of basic convertor unit of inverter inside
The mean value of stream voltage；GkFor k-th convertor unit series average-voltage control ring PI controller；RefkFor k-th convertor unit series connection
Pressure and Control ring PI controller output quantities, namely Pressure and Control superposition amount；UdckFor the real-time DC voltage of k-th convertor unit.
Or, can also be only with lower bound controller, or only with high limit controller, be also capable of achieving to change substantially
The real-time DC voltage value of stream unit is controlled near mean value.
In addition, the present invention also provides a kind of combination transverter, combining each basic convertor unit of transverter includes correspondence
DC voltage error method device, correspondence DC voltage deviation control is superimposed with the real power control passage of each basic convertor unit
The controlled output amount of device processed, DC voltage error method device is with the mean value of the real-time DC voltage of basic convertor unit as base
It is accurate.
The core of combination transverter is that combinations thereof inverter inside DC voltage balance control method, the method energy
Some existing control method (the alternating voltage outer shrouds in Fig. 3, Fig. 4 being enough applied to used in the combination transverter of foregoing description
Control, exchange inner ring control etc.), it is also possible in being applied to other existing control methods, such as Direct Current Control or indirect
Current control etc., it is only necessary on the basis of these existing control methods, correspondence superposition is straight on the active passage of convertor unit
The controlled output amount of stream deviation controller falls into protection scope of the present invention.
Due to being described in detail to combinations thereof inverter inside DC voltage balance control method, therefore to combining the change of current
Device is repeated no more.
Claims (10)
1. it is a kind of to combine inverter inside DC voltage balance control method, it is characterised in that in each basic convertor unit
Control system in add a DC voltage error method device, the DC voltage error method device is with basic convertor unit
In real time on the basis of the mean value of DC voltage, and the controlled output amount of the DC voltage error method device is added to correspondence base
On the real power control passage of this convertor unit.
2. it is according to claim 1 to combine inverter inside DC voltage balance control method, it is characterised in that described straight
Stream voltage deviation controller includes high limit controller, and the high limit reference voltage of high limit controller is real-time with basic convertor unit
DC voltage carries out closed-loop control after making the difference, and obtains high limit closed-loop control output quantity, and the high limit closed-loop control output quantity is straight
The controlled output amount of stream voltage deviation controller；Wherein, the high limit reference voltage is the real-time direct current of basic convertor unit
K_up times of average is flattened, K_up is more than 1.
3. it is according to claim 1 to combine inverter inside DC voltage balance control method, it is characterised in that described straight
Stream voltage deviation controller includes lower bound controller, and the lower bound reference voltage of lower bound controller is real-time with basic convertor unit
DC voltage carries out closed-loop control after making the difference, and obtains lower bound closed-loop control output quantity, and the lower bound closed-loop control output quantity is straight
The controlled output amount of stream voltage deviation controller；Wherein, the lower bound reference voltage is the real-time direct current of basic convertor unit
K_low times of average is flattened, K_low is less than 1.
4. it is according to claim 1 to combine inverter inside DC voltage balance control method, it is characterised in that described straight
Stream voltage deviation controller includes high limit controller and lower bound controller, by the lower bound reference voltage of lower bound controller with change substantially
The real-time DC voltage of stream unit carries out closed-loop control after making the difference, and obtains lower bound closed-loop control output quantity；By high limit controller
Lower bound reference voltage carries out closed-loop control after making the difference with the real-time DC voltage of basic convertor unit, obtains the closed-loop control of high limit defeated
Output；The result that lower bound closed-loop control output quantity is added with high limit closed-loop control output quantity is the control of DC voltage error method device
Output quantity processed；Wherein, the lower bound reference voltage is K_low times of the real-time DC voltage average value of basic convertor unit, K_
Low is less than 1, and high limit reference voltage is K_up times of the real-time DC voltage average value of basic convertor unit, and K_up is more than 1.
5. the combination inverter inside DC voltage balance control method according to any one of Claims 1 to 4, its feature exists
In, the real power control passage be using determine the outer shroud active power controller passage of power cutting-in control, that electric current is determined in employing is grid-connected
The watt current control passage of control adopts the control passage corresponding with frequency for determining the control of alternating voltage isolated island.
6. it is a kind of to combine transverter, it is characterised in that each basic convertor unit of the combination transverter includes corresponding straight
Stream voltage deviation controller, is superimposed with correspondence DC voltage error method device on the real power control passage of each basic convertor unit
Controlled output amount, the DC voltage error method device is with the mean value of the real-time DC voltage of basic convertor unit as base
It is accurate.
7. combination transverter according to claim 6, it is characterised in that the DC voltage error method device includes high limit
Controller, the controlled output amount of the DC voltage error method device is high limit closed-loop control output quantity, high limit closed loop control
Output quantity processed is to carry out closed loop after the high limit reference voltage of high limit controller makes the difference with the real-time DC voltage of basic convertor unit
The result that control is obtained, high limit the real-time DC voltage average value that reference voltage is basic convertor unit K_up times, K_
Up is more than 1.
8. combination transverter according to claim 6, it is characterised in that the DC voltage error method device includes lower bound
Controller, the controlled output amount of the DC voltage error method device is lower bound closed-loop control output quantity, the lower bound closed loop control
Output quantity processed carries out closed loop after making the difference with the real-time DC voltage of basic convertor unit for the lower bound reference voltage of lower bound controller
The result obtained after control, the lower bound reference voltage is K_low times of the real-time DC voltage average value of basic convertor unit,
K_low is less than 1.
9. combination transverter according to claim 6, it is characterised in that the DC voltage error method device includes high limit
Controller and lower bound controller, the controlled output amount of the DC voltage error method device for high limit closed-loop control output quantity with it is low
The result that limit closed-loop control output quantity is added, the high limit closed-loop control output quantity is high limit reference voltage and basic convertor unit
Real-time DC voltage make the difference after carry out the result that obtains after closed-loop control, the lower bound closed-loop control output quantity is lower bound reference
Voltage carries out the result obtained after closed-loop control after making the difference with the real-time DC voltage of basic convertor unit, the high limit is with reference to electricity
Press the real-time DC voltage average value for basic convertor unit K_up times, the lower bound reference voltage is basic convertor unit
K_low times of real-time DC voltage average value, K_up is less than 1 more than 1, K_low.
10. the combination transverter according to any one of claim 6～9, it is characterised in that the real power control passage is to adopt
With determine power cutting-in control outer shroud active power controller passage, using determine electric current cutting-in control watt current control passage or
Using the control passage corresponding with frequency for determining the control of alternating voltage isolated island.
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| CN201710010657.XA CN106655238A (en) | 2017-01-06 | 2017-01-06 | Combined current converter and internal DC voltage balance control method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100238060A1 (en) * | 2009-03-19 | 2010-09-23 | Richtek Technology Corp. | Hybrid control circuit and method |
| CN103368170A (en) * | 2013-06-26 | 2013-10-23 | 许继集团有限公司 | Converter and control method of multi-end soft direct current power transmission system |
| CN105471269A (en) * | 2015-12-30 | 2016-04-06 | 国网智能电网研究院 | Power electronic transformer power balance control method and system based on H-bridge chained mode |
-
2017
- 2017-01-06 CN CN201710010657.XA patent/CN106655238A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100238060A1 (en) * | 2009-03-19 | 2010-09-23 | Richtek Technology Corp. | Hybrid control circuit and method |
| CN103368170A (en) * | 2013-06-26 | 2013-10-23 | 许继集团有限公司 | Converter and control method of multi-end soft direct current power transmission system |
| CN105471269A (en) * | 2015-12-30 | 2016-04-06 | 国网智能电网研究院 | Power electronic transformer power balance control method and system based on H-bridge chained mode |
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Application publication date: 20170510 |
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