CN208754002U - A kind of asymmetrical component detection of more level photovoltaic inverters and cancellation element - Google Patents
A kind of asymmetrical component detection of more level photovoltaic inverters and cancellation element Download PDFInfo
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- CN208754002U CN208754002U CN201820989900.7U CN201820989900U CN208754002U CN 208754002 U CN208754002 U CN 208754002U CN 201820989900 U CN201820989900 U CN 201820989900U CN 208754002 U CN208754002 U CN 208754002U
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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
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The asymmetrical component that the utility model provides a kind of more level photovoltaic inverters detects and cancellation element, is related to distributed generation resource multilevel power electronic power convertor controls technical field.The device includes photovoltaic panel, modular multilevel photovoltaic DC-to-AC converter and control circuit module, photovoltaic panel includes several series-parallel photovoltaic array modules, modular multilevel photovoltaic DC-to-AC converter uses six bridge arm topological structure of three-phase, and control circuit module includes that unit is eliminated in trigger circuit, signal input circuit, drive amplification circuit, signal processing control unit and asymmetrical component detection.The modular multilevel photovoltaic DC-to-AC converter of the utility model, using the half-bridge circuit of switching tube and diode, so that the control of inverter is more simple, the reliability of system control is improved, and reduces the use of switching device, it is economical, suitable for many voltage class, flexibility is more preferable, and operating method is simple and easy, is suitable for engineer application.
Description
Technical field
The utility model relates to distributed generation resource multilevel power electronic power convertor controls technical fields, more particularly to
A kind of asymmetrical component detection of more level photovoltaic inverters and cancellation element.
Background technique
In recent years, as environmental pollution and lack of energy problem are increasingly severe, solar energy is used as one kind is clean can be again
The raw energy, the more and more attention by countries in the world, China develop and utilize renewable energy, Optimization of Energy Structure
Dynamics also continue to increase.Currently, photovoltaic power generation items technology has tended to be mature, the enlargement of photovoltaic plant and simultaneously networking will
It is developing direction and research emphasis from now on.But with the rapid development of photovoltaic industry, photovoltaic power generation capacity is significantly mentioned
Rise, some problems also highlight accordingly, such as photovoltaic array power generation low efficiency, parallel network power generation it is big to electric network influencing,
Gird-connected inverter need to meet higher requirement etc..
Current solar energy power generating is substantially all to exchange based on grid-connected form, either centralized photovoltaic DC-to-AC converter
Or distributed photovoltaic inverter, output voltage is all relatively low, mostly 400V hereinafter, if by photovoltaic power generation grid-connecting,
It needs by being incorporated to DC distribution net again after rectifying after inverter using transformer boosting.This system equipment is more, occupied area
Greatly, the deficiencies such as structure is complicated, transfer efficiency is low.Although the modular multilevel photovoltaic DC-to-AC converter newly proposed compensate for it is above not
Foot, but work as AC system and situations such as Voltage Drop, exchange side failure, load switching often occur, then it will appear three-phase alternating current
System asymmetry situation, for asymmetric failure problems, existing literature is not directed to the control of modular multilevel photovoltaic DC-to-AC converter
System.
Utility model content
In view of the above-mentioned deficiencies of the prior art, technical problem to be solved by the utility model is to provide a kind of more level photovoltaics
The asymmetrical component of inverter detects and cancellation element, realizes the detection and elimination of network voltage asymmetrical component, passes through control
Two harmonics that negative sequence component inhibits power to occur, without injecting additional residual voltage etc., so that it may guarantee three-phase voltage, function
The balance of rate, method is simple, is easy to the realization of engineering.
In order to solve the above technical problems, technical solution adopted in the utility model is: a kind of more level photovoltaic inverters
Asymmetrical component detection and cancellation element, including photovoltaic panel, modular multilevel photovoltaic DC-to-AC converter and control circuit module；
The photovoltaic panel includes several series-parallel photovoltaic array modules, and the equivalent circuit of the photovoltaic array module includes
Solar cell module, parallel diode, parallel resistance and the shunt capacitance and series resistance of solar cell module aggregate；
The parallel diode and parallel resistance are connected in parallel on composition solar cell module aggregate on solar cell module, in parallel
Capacitor is connected in parallel on solar cell module aggregate both ends and constitutes parallel-connection structure；Series resistance is connected with the parallel-connection structure, should
The both ends of cascaded structure are the output end of photovoltaic array module；
The modular multilevel photovoltaic DC-to-AC converter uses six bridge arm topological structure of three-phase, and wherein every phase of three-phase includes
Upper and lower two bridge arms, each bridge arm include n sub- unit modules, and n is at least 2；The input terminal of the subelement module connects
The output end of photovoltaic array module is connect, the output end of subelement module connects three-phase AC grid；
The subelement module includes DC/DC converter and SM unit, and the input terminal of the DC/DC converter accesses photovoltaic
Array module, output end access SM unit；The SM unit include two switching tube VT1 and VT2, two diode VD1 with
VD2, shunt capacitance C and switch K, switching tube VT1 are connected with VT2 by emitter and collector, two diode VD1 with
VD2 is connected in parallel on respectively between the collector and emitter of switching tube VT1 between the collector and emitter of VT2, and switching tube
The anode of emitter and corresponding diode connect, shunt capacitance C is connected in parallel on the both ends of two switching tube cascaded structures, switch K
It is connected in parallel between the collector and emitter of switching tube VT2, and input terminal of the both ends of switch K as SM unit.
The DC/DC converter is isolated form DC/DC converter.
The operating mode of the subelement module includes discharge mode and charge mode, is led with specific reference to switching tube is different
Logical and off state, realizes that different working conditions, subelement module specific works state include:
(1) blocking: VTI and VT2 does not apply trigger signal, and the two is off state；The locking of subelement module
State is in the starting of modular multilevel photovoltaic DC-to-AC converter or use when breaking down；
(2) put into state: when VT1 is connected and VT2 is off state, subelement module fracture voltage is subelement module
The voltage at the both ends middle shunt capacitance C, subelement module capacitance work in charge or discharge state, this state is also referred to as full voltage
State；
(3) cut off state: when VT1 is turned off and VT2 is on state, subelement module port voltage is 0, subelement mould
Block capacitor is not involved in work, this state is also referred to as zero-voltage state；Guarantee that the son of every phase investment of any moment is single when operating
Constant element module number is N, and the voltage of single subelement module is Udc=NUc at this time, and wherein Uc is the electricity at the both ends shunt capacitance C
Pressure.
The control circuit module includes trigger circuit, signal input circuit, drive amplification circuit, signal processing control list
Unit is eliminated in member and asymmetrical component detection；The trigger circuit passes through in the more level photovoltaic inverters of trigger link blockization
Each electronic device；The output end of the input terminal connection photovoltaic array module of the signal input circuit, signal input circuit
Output end connects drive amplification circuit input end；The output end connection signal processing and control element (PCE) of the drive amplification circuit and not
Unit is eliminated in symmetrical components detection；The signal processing control unit and asymmetrical component detection are eliminated unit and are all made of at DSP
Device is managed to realize；The more level photovoltaic inverters of output end AM access moduleization of the signal processing control unit；Described asymmetric point
It includes that asymmetrical component detection unit and asymmetrical component eliminate unit that unit is eliminated in amount detection.
The beneficial effects of adopting the technical scheme are that a kind of more level photovoltaics provided by the utility model are inverse
Become asymmetrical component detection and the cancellation element of device, modular multilevel photovoltaic DC-to-AC converter therein, using switching tube and two poles
The half-bridge circuit of pipe improves the reliability of system control so that the control of inverter is more simple, and reduces derailing switch
The use of part, it is economical, it is suitable for many voltage class, flexibility is more preferable, and operating method is simple and easy, is suitable for engineering
Using.
Detailed description of the invention
Fig. 1 is asymmetrical component detection and the cancellation element of more level photovoltaic inverters provided by the embodiment of the utility model
Structural schematic diagram；
Fig. 2 is photovoltaic array module equivalent circuit diagram provided by the embodiment of the utility model；
Fig. 3 is modular multilevel photovoltaic DC-to-AC converter topological diagram provided by the embodiment of the utility model；
Fig. 4 is SM cellular construction figure in Fig. 3；
Fig. 5 is asymmetrical component detection and the removing method of more level photovoltaic inverters provided by the embodiment of the utility model
Flow chart；
Fig. 6 is that phaselocked loop phase sequence decomposes link structure chart under asymmetrical state provided by the embodiment of the utility model；
Fig. 7 is to inhibit negative-sequence current modularization how electric under AC system asymmetrical state provided by the embodiment of the utility model
Zero diopter lies prostrate inverter control structures figure.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is not intended to limit the scope of the present invention for illustrating the utility model.
As shown in Figure 1, a kind of asymmetrical component detection of more level photovoltaic inverters provided in this embodiment is filled with elimination
It sets, including photovoltaic panel, modular multilevel photovoltaic DC-to-AC converter and control circuit module.
Photovoltaic panel includes several series-parallel photovoltaic array modules, equivalent circuit such as Fig. 2 institute of the photovoltaic array module
Show, solar cell module, parallel diode D, parallel resistance R including solar cell module aggregateshAnd shunt capacitance C
With series resistance Rs.Parallel diode D and parallel resistance RshIt is connected in parallel on solar cell module and constitutes solar battery group
Part aggregate, shunt capacitance C are connected in parallel on solar cell module aggregate both ends and constitute parallel-connection structure；Series resistance RsWith it is described
Parallel-connection structure series connection, the both ends of the cascaded structure are the output end of photovoltaic array module.IphAfter being irradiated for photovoltaic cell via light
Generated electric current；RshFor material internal equivalent parallel resistance；RsFor material internal equivalent series resistance；I is that photovoltaic cell is defeated
Electric current out；UocFor photovoltaic cell output voltage；IDFor dark current, when no light situation, there is external voltage to act on and flowed through in lower PN junction
Monophase current.
The modular multilevel photovoltaic DC-to-AC converter is as shown in figure 3, using six bridge arm topological structure of three-phase, wherein three-phase
Every phase includes upper and lower two bridge arms, each bridge arm includes n sub- unit modules, and n is at least 2；The subelement module
Input terminal connection photovoltaic array module output end, the output end of subelement module connects three-phase AC grid.
The subelement module includes DC/DC converter and SM unit, and the input terminal of DC/DC converter accesses photovoltaic array
Module, output end access SM unit, and DC/DC converter is isolated form DC/DC converter.SM unit is as shown in figure 4, include two
Switching tube VT1 and VT2, two diodes VD1 and VD2, shunt capacitance C and switch K, switching tube VT1 and VT2 pass through emitter
Connect with collector, two diodes VD1 and VD2 be connected in parallel between the collector and emitter of switching tube VT1 respectively with
Between the collector and emitter of VT2, and the emitter of switching tube is connected with the anode of corresponding diode, and shunt capacitance C is in parallel
At the both ends of two switching tube cascaded structures, switch K is connected in parallel between the collector and emitter of switching tube VT2, and switch K
Input terminal of the both ends as SM unit.
The operating mode of subelement module includes discharge mode and charge mode, with specific reference to the different conducting of switching tube and
Off state realizes that different working conditions, subelement module specific works state include:
(1) blocking: VTI and VT2 does not apply trigger signal, and the two is off state；The locking of subelement module
State is in the starting of modularization multi-level converter or use when breaking down；
(2) put into state: when VT1 is connected and VT2 is off state, subelement module fracture voltage is subelement module
The voltage at the both ends middle shunt capacitance C, subelement module capacitance work in charge or discharge state, this state is also referred to as full voltage
State；
(3) cut off state: when VT1 is turned off and VT2 is on state, subelement module port voltage is 0, subelement mould
Block capacitor is not involved in work, this state is also referred to as zero-voltage state；Guarantee that the son of every phase investment of any moment is single when operating
Constant element module number is N, and the voltage of single subelement module is Udc=NUc at this time, and wherein Uc is the electricity at the both ends shunt capacitance C
Pressure.
Control circuit module include trigger circuit, signal input circuit, drive amplification circuit, signal processing control unit and
Unit is eliminated in asymmetrical component detection.Trigger circuit passes through each electronics in the more level photovoltaic inverters of trigger link blockization
Device is triggered by sending trigger pulse voltage.The output of the input terminal connection photovoltaic array module of signal input circuit
End, for obtaining voltage and current input signal, the output end of signal input circuit connects drive amplification circuit input end.Driving is put
For big circuit for amplifying input signal, list is eliminated in output end connection signal processing and control element (PCE) and asymmetrical component detection
Member.Signal processing control unit and asymmetrical component detection eliminate unit and are all made of dsp processor realization.
The control strategy that signal processing control unit includes has phase-shifting carrier wave modulation strategy, double-loop control strategy, circulation
Inhibit strategy, capacitance voltage control strategy, the more level photovoltaic inverters of output end AM access moduleization finally will be handled and be controlled
The signal output made is connected to the grid.
It includes that asymmetrical component detection unit and asymmetrical component eliminate unit that unit is eliminated in asymmetrical component detection.
Asymmetrical component detection unit includes obtaining photovoltaic array to pass through the DC voltage that maximal power tracing controls
Ud, DC voltage need to obtain three-phase voltage by modular multilevel photovoltaic DC-to-AC converter, judge its three-phase voltage；Just
In normal situation, network voltage is sine wave or approximate sine wave, cannot be directly compared；It therefore, need to be by three-phase power grid voltage
Its virtual value is sought respectively, then is compared with limit value.By network voltage asymmetric control algorithm, network voltage A, B, C
Any one phase of three-phase exceeds national standard range, as three-phase voltage asymmetry, and then the more level photovoltaic inverters of detection moduleization are defeated
It whether there is negative sequence voltage, negative-sequence current component in three-phase voltage out.
The asymmetrical component that asymmetrical component is eliminated unit and be will test is handled, including phaselocked loop under asymmetrical state
Phase sequence decomposes link and eliminates control unit, and it is not right that the three-phase voltage for exporting to modular multilevel photovoltaic DC-to-AC converter carries out
Phaselocked loop phase sequence is decomposed under title state, realizes the decomposition to positive sequence voltage and negative sequence voltage, forward-order current and negative-sequence current, therefrom
Negative sequence voltage, negative-sequence current component are extracted and eliminated, it is made to be set to zero.
The asymmetrical component of more level photovoltaic inverters detects and removing method, real using above-mentioned detection and cancellation element
It is existing, as shown in figure 5, photovoltaic array controls to obtain DC voltage by maximal power tracing, by modular multilevel inverter
Shifting modulation technology and double-loop control strategy, loop current suppression strategy etc. obtain three-phase voltage, by asymmetrical component
Detection eliminates unit detection three-phase voltage asymmetry component and asymmetrical component is needed to realize forward-order current and negative-sequence current
Independent control, therefore design phase sequence decompose link realize to positive sequence voltage and negative sequence voltage, forward-order current and negative-sequence current
Decomposition, finally design removing method, this scheme by control negative-sequence current component inhibit power occur two harmonics, this
Scheme extracts negative-sequence current and is set to zero, so that it may guarantee the balance of three-phase voltage, power without injecting additional residual voltage etc..
Specifically include asymmetrical component detection method and asymmetrical component null method.
The asymmetrical component detection method obtains photovoltaic array first and passes through the direct current that maximal power tracing controls
Ud is pressed, DC voltage need to obtain three-phase voltage by modular multilevel photovoltaic DC-to-AC converter, judge its three-phase voltage；
Under normal circumstances, network voltage is sine wave or approximate sine wave, cannot directly be compared, need to distinguish three-phase power grid voltage
Its virtual value is sought, then is compared with limit value, by network voltage asymmetric control algorithm, network voltage A, B, C three-phase
Any one phase exceeds the limit value of national standard range, as three-phase voltage asymmetry.
The asymmetrical component that the asymmetrical component null method will test is handled, including locking phase under asymmetrical state
Ring phase sequence decomposes link and eliminates controlling unit；
Phaselocked loop phase sequence decomposes link under the asymmetrical state, as shown in fig. 6, extracting three-phase voltage u firstsa、usb、
uscThree-phase voltage is become stationary to the two-phase voltage U under coordinate system by Park Transformation linksα、Usβ, it is easily controllable, then pass through
Time delay process is crossed, the voltage delay a quarter period is passed through into equivalent transformation relationship, is realized to positive sequence voltage and negative sequence voltage, just
The decomposition of sequence electric current and negative-sequence current obtains phase angle theta by phaselocked loop and obtains the voltage U under synchronous rotating framesb、Usq。
Controlling unit is eliminated under the asymmetrical state, from negative-sequence current angle is inhibited, designs relevant control plan
Slightly, to improve system reliability of operation, as shown in fig. 7, to inner ring positive sequence and negative-sequence current control under asymmetrical state
Device decoupling, and then extract negative-sequence current, juxtaposition its be zero.
Inner ring positive sequence and negative-sequence current controller under the asymmetrical state is according to modular multilevel photovoltaic DC-to-AC converter
Low frequency transient mathematical model is designed, the modular multilevel photovoltaic DC-to-AC converter low frequency transient mathematical model such as formula (1) and
Shown in formula (2)；
Wherein, R, L are respectively the equivalent resistance of modular multilevel photovoltaic DC-to-AC converter, inductance；usd、usqRespectively exchange
Component of the side three-phase fundamental voltage on d, g axis, ucd、ucqRespectively modular multilevel photovoltaic DC-to-AC converter output voltage is in d, q
Component on axis, isd、isqRespectively system exchanges side three-phase current in the component of d, g axis, and subscript sign respectively indicates positive sequence
Component and negative sequence component；ω is angular speed；
By formula (1) and formula (2) it can be seen that d, q axis component there are coupled relations, at this time for design inner ring forward-order current and
Negative-sequence current decoupling and controlling system, ifWherein, λ and μ is to introduce
PI controller parameter,The respectively instruction of positive sequence watt current and negative phase-sequence watt current reference value of d axis, The respectively instruction of positive sequence watt current and negative phase-sequence watt current reference value of q axis；Then inner ring forward-order current and negative-sequence current
The mathematical model of controller is respectively as shown in formula (3) and formula (4)；
It is learnt according to mathematical model of the system under asymmetrical state, the access of negative-sequence current is to cause the main original of failure
One of because, therefore it is directed to negative-sequence current, design following inhibition control strategy:
If d, q axis negative-sequence current reference value in formula (3) are respectively as follows:
According to the above analysis, the elimination controller design by system under asymmetrical state is finished at this time.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that:
It can still modify to technical solution documented by previous embodiment, or to some or all of the technical features
It is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and the utility model right is wanted
Seek limited range.
Claims (3)
1. a kind of asymmetrical component of more level photovoltaic inverters detects and cancellation element, it is characterised in that: including photovoltaic panel, mould
The more level photovoltaic inverters of blockization and control circuit module；
The photovoltaic panel includes several series-parallel photovoltaic array modules, and the equivalent circuit of the photovoltaic array module includes the sun
Solar cell module, parallel diode, parallel resistance and the shunt capacitance and series resistance of energy battery component aggregate；It is described
Parallel diode and parallel resistance are connected in parallel on composition solar cell module aggregate, shunt capacitance on solar cell module
It is connected in parallel on solar cell module aggregate both ends and constitutes parallel-connection structure；Series resistance is connected with the parallel-connection structure, the series connection
The both ends of resistance and the concatenated structure of parallel-connection structure are the output end of photovoltaic array module；
The modular multilevel photovoltaic DC-to-AC converter use six bridge arm topological structure of three-phase, wherein every phase of three-phase include it is upper,
Lower two bridge arms, each bridge arm include n sub- unit modules, and n is at least 2；The input terminal of the subelement module connects
The output end of the output end of photovoltaic array module, subelement module connects three-phase AC grid；
The subelement module includes DC/DC converter and SM unit, and the input terminal of the DC/DC converter accesses photovoltaic array
Module, output end access SM unit；The SM unit includes two switching tube VT1 and VT2, two diodes VD1 and VD2, simultaneously
Join capacitor C and switch K, switching tube VT1 is connected with VT2 by emitter and collector, and two diode VD1 and VD2 divide
It is not connected in parallel between the collector and emitter of switching tube VT1 between the collector and emitter of VT2, and the transmitting of switching tube
Pole is connected with the anode of corresponding diode, and shunt capacitance C is connected in parallel on the both ends of two switching tube cascaded structures, and switch K is connected in parallel on
Between the collector and emitter of switching tube VT2, and input terminal of the both ends of switch K as SM unit；
The control circuit module include trigger circuit, signal input circuit, drive amplification circuit, signal processing control unit and
Unit is eliminated in asymmetrical component detection；The trigger circuit passes through each in the more level photovoltaic inverters of trigger link blockization
Electronic device；The output end of the input terminal connection photovoltaic array module of the signal input circuit, the output of signal input circuit
End connection drive amplification circuit input end；The output end connection signal processing and control element (PCE) and asymmetry of the drive amplification circuit
Component detection eliminates unit；The signal processing control unit and asymmetrical component detection eliminate unit and are all made of dsp processor
It realizes；The more level photovoltaic inverters of output end AM access moduleization of the signal processing control unit；The asymmetrical component inspection
Surveying and eliminating unit includes that asymmetrical component detection unit and asymmetrical component eliminate unit.
2. the asymmetrical component of more level photovoltaic inverters according to claim 1 detects and cancellation element, feature exist
In: the operating mode of the subelement module include discharge mode and charge mode, with specific reference to the different conducting of switching tube and
Off state realizes that different working conditions, subelement module specific works state include:
(1) blocking: VTI and VT2 does not apply trigger signal, and the two is off state；The blocking of subelement module
In the starting of modular multilevel photovoltaic DC-to-AC converter or use when breaking down；
(2) put into state: when VT1 conducting and VT2 be off state when, subelement module fracture voltage be subelement module in simultaneously
Join the voltage at the both ends capacitor C, subelement module capacitance works in charge or discharge state, this state is also referred to as full voltage shape
State；
(3) cut off state: when VT1 is turned off and VT2 is on state, subelement module port voltage is 0, subelement module electricity
Appearance is not involved in work, this state is also referred to as zero-voltage state；Guarantee the subelement mould of every phase investment of any moment when operating
Constant block number is N, and the voltage of single subelement module is Udc=NUc at this time, and wherein Uc is the voltage at the both ends shunt capacitance C.
3. the asymmetrical component of more level photovoltaic inverters according to claim 1 detects and cancellation element, feature exist
In: the DC/DC converter is isolated form DC/DC converter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247566A (en) * | 2019-07-05 | 2019-09-17 | 沈阳工业大学 | A kind of detection of the DC side failure based on MMC dissymmetric network and blocking-up method |
| TWI721621B (en) * | 2019-10-29 | 2021-03-11 | 財團法人工業技術研究院 | Three-phase expandable ac system based on battery reconfiguration and control method thereof |
-
2018
- 2018-06-26 CN CN201820989900.7U patent/CN208754002U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247566A (en) * | 2019-07-05 | 2019-09-17 | 沈阳工业大学 | A kind of detection of the DC side failure based on MMC dissymmetric network and blocking-up method |
| CN110247566B (en) * | 2019-07-05 | 2021-04-13 | 沈阳工业大学 | Direct current side fault detection and blocking method based on MMC asymmetric network |
| TWI721621B (en) * | 2019-10-29 | 2021-03-11 | 財團法人工業技術研究院 | Three-phase expandable ac system based on battery reconfiguration and control method thereof |
| US11424620B2 (en) | 2019-10-29 | 2022-08-23 | Industrial Technology Research Institute | Three-phase expandable AC system based on battery reconfiguration and control method thereof |
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