EP3286826A1 - Dc/dc/ac converter system - Google Patents
Dc/dc/ac converter systemInfo
- Publication number
- EP3286826A1 EP3286826A1 EP16732784.0A EP16732784A EP3286826A1 EP 3286826 A1 EP3286826 A1 EP 3286826A1 EP 16732784 A EP16732784 A EP 16732784A EP 3286826 A1 EP3286826 A1 EP 3286826A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- converter
- voltage
- phase
- filter
- bridge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- 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
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Definitions
- the object of the invention is a DC/DC/AC converter system, converting the energy from Renewable Energy Sources (RES), in particular photovoltaic panels that indicate parasite capacities, to a single-phase or three-phase power grid.
- RES Renewable Energy Sources
- PP Photovoltaic Panels
- solar energy can be converted into electric energy.
- PP can be treated as the source of uncontrolled DC voltage with limited power.
- the PV energy can be used for one's own needs in the direct form, without processing (e.g. directly to a heater), or it can be stored by charging batteries, a separated network system can be created, or it can be delivered to the power grid.
- PP is characterised by a large surface area, which in some cases can lead to creation of capacity between the photovoltaic panels and the earth. The capacity, in the range of 150-750 pF for 3 kW power, does not seem to be large.
- the presented ways to reduce the leakage current consist in disconnecting the DC bus on transistor switching, which causes reduction of oscillation introduced on the DC bus.
- This topology obviously requires the application of an EMC filter as well.
- using active components is associated with the risk of damaging them, e.g. due to aging.
- the cost of control additional PWM signal
- the control system additional controller with a voltage source for isolated MOSFET transistor
- bridges consisting of 12 or more transistors are used.
- Such topologies e.g. NPC1, NPC2, i.e. Neutral Point Clamping
- NPC1, NPC2, i.e. Neutral Point Clamping require more complex control and cause the reduction of leakage current by reducing oscillation on the DC bus.
- systems for passive elimination of leakage current are used. They are systems based on LC and LCL filters. As compared to the active ways of reducing leakage current, they require a larger number of passive elements as well as an additional EMC filter. Controlling the current in such system is more demanding since combination of two variables (e.g. current and output voltage) is required. Besides, overvoltage caused by resonance may occur on LC and LCL filter elements. The resonance can take place for specific conditions occurring in the grid (e.g. cooperation with a thyristor converter, engines, and other unpredictable loads) .
- RES allows generating energy for one's own needs.
- Inverters available on the market do not have the function to limit the produced power, and therefore they cannot be used for managing smart power grids of Smart Grid type.
- the technical challenge faced by the present invention is providing such DC/DC/AC converter system that would provide better elimination of the leakage current in the system, will be characterised by a limited number of components, free from active elements, which will have a positive influence upon the economic result, will demonstrate preferred interference characteristics constituting at the same time a durable, reliable and stable solution. Furthermore, it is desired to provide a system that will dynamically react, preferably in less than 1 second, to the changes of the power in the system, and will allow to limit the power of the converter itself, protecting against introduction of too much energy into the grid. Additionally, it is desired that the DC/DC/AC converter system minimize the reactive power consumed by the recipient, positively influencing the economics of the solution. Unexpectedly, the technical problems listed above have been solved by the present invention.
- the object of the invention is a DC/DC/AC converter system converting energy from renewable energy sources, in particular photovoltaic panels, comprising an input filter connected with a voltage converter that is in turn connected with the charge storage system, and then the system is connected with a transistor bridge followed by a low pass filter, an output filter and to the grid connection, characterised in that the low pass filter is a magnetically coupled inductor.
- bidirectional converter is attached parallel to the voltage converter, to charge the charge storage system of other voltage than the voltage on the DC bus.
- the bidirectional converter is a system of two high-frequency transformers or one high-frequency transformer with an adequate number of transistors on both the primary and secondary side.
- the system also includes a control system functionally coupled with an input filter, a voltage converter, a bidirectional converter, a charge storage system, a transistor bridge and an output filter.
- the functional coupling of the control system with other components of the converter system means collection of measurement data from the meters included in the output and input filter blocks, controlling the operation of the voltage converter, bidirectional converter, and the transistor bridge.
- the control system is a DSP processor, a processor with an ARM core, a FPGA system with adequate peripherals.
- the input filter and/or the output filter is an EMC filter.
- the voltage converter is a boost type, soft switching boost or interleaved boost converter.
- the charge storage system is an electric component selected from a group including: a capacitor, a supercapacitor , a rechargeable battery, a flow battery, a resonance system or the charge storage system is a system of superconductors storing magnetic energy.
- the transistor bridge is a bridge selected from topologies including: H-bridge, Half- bridge, 3-phase bridge, multilevel matrix converter, multilevel delink converter, NPC1, NPC2, FC (flying capacitor), CI (coupled inductor) .
- the grid connection is a single-phase alternating voltage of 230 V and 50 Hz frequency grid connection or three-phase grid connection with alternating phase-to-phase voltage of 400 V and 50 Hz.
- external communication devices are connected to the control system, providing collection of data from the external system and transmitting them to the system in order to limit the power and to control the reactive power.
- the connection of the external communication device with the control system is executed as either wired or wireless .
- the DC/DC/AC converter system converts the energy from the renewable energy sources, in particular in the form of photovoltaic panels, taking into account the leakage capacity and resistance through which the leakage current can flow that negatively influences the effectiveness of transmitting the collected power into a single-phase or a three-phase grid connection.
- the leakage current has been significantly reduced in this system, increasing the current effectiveness of the whole photovoltaic system.
- the implementation of magnetically coupled inductor not only enabled elimination of leakage current, but also resulted in the smaller number of DC/DC/AC converter components, which in turn is a solution with a higher durability and reliability, and lower total cost in comparison with the solutions known in the art.
- the application of the magnetically coupled inductor did not introduce any additional interference into the system, and placing the system in an enclosure reduced the negative influence of the magnetic field generated by the coil upon emission interference.
- the application of an external communication system connected to the control system provided dynamic variation of the system power implemented in a time shorter than 1 second by limiting the power of the DC/DC/AC converter system itself according to the present invention.
- the present DC/DC/AC converter system allows generating reactive power with an opposite sign, and a significant reduction of its consumption (assuming there is energy in the photovoltaic panels) .
- fig. 1 is a simplified model of a DC/DC/AC converter known in the state of the art
- fig. 2 is a block diagram of a first embodiment of the DC/DC/AC converter system according to the present invention
- fig. 3 is a block diagram of a second embodiment of the DC/DC/AC converter system according to the present invention
- fig. 4 illustrates the noise waveform in the system from fig. 2
- fig. 5 illustrates the leakage current waveform in the system according to the state of the art for a first case of photovoltaic panels
- fig. 6 illustrates the leakage current curve in the system according to the state of the art for a second case of photovoltaic panels
- fig. 1 is a simplified model of a DC/DC/AC converter known in the state of the art
- fig. 2 is a block diagram of a first embodiment of the DC/DC/AC converter system according to the present invention
- fig. 3 is a block diagram of a second embodiment of the DC/DC/AC
- FIG. 7 illustrates the leakage current curve in the system according to the first embodiment of the present invention for a first case of photovoltaic panels
- fig. 8 illustrates the leakage current curve in the system according to the first embodiment of the present invention for a second case of photovoltaic panels .
- FIG. 2 A block diagram of the DC/DC/AC converter system according to the first embodiment of the present invention is illustrated in fig. 2, where consecutive numeral references indicate:
- 1 - Renewable Energy Source e.g. photovoltaic panels connected serially-parallel, with uncontrolled DC voltage in 25 - 900 V range, 2 - Input EMC filter,
- Renewable Energy Source 1 generates uncontrolled DC voltage.
- the voltage is converted by converter 3 and stabilised on DC- Link 4.
- transistor bridge 5 Utilizing the properties of the low pass filter 6, transistor bridge 5 generates voltage impulses forcing the flow of current. Filter 6 allows to shape the current by means of adequate control algorithms. The current generated this way is transferred to single-phase grid connection 8.
- the whole operation of the DC/DC/AC converter is supervised by DSP processor or FPGA system 10 that collects the current /voltage measurements, performs computation of maximum operating point and this way controls converter 3 and bridge 5 for the energy transferred to grid 8 from RES 1 be the maximum and meet all the required standards imposed by power engineering.
- EMC input filter 2 and EMC output filter 7 filter high frequency wire interference in order to meet the required EMC standards.
- the capacity of photovoltaic panels 9 requires particular attention. Photovoltaic panels 9 occupy large area. This area causes occurrence of capacity relative to the earth, which, in transformer-less solutions, creates new path for high- frequency current that is unfavourable and creates hazards for personnel working in the vicinity of the panels and the converter.
- Capacity is estimated to be 150 - 750 pF for single-phase installations with power of up to 3 kW, and is strongly correlated with the atmospheric conditions.
- low-pass filter 6 in the form of a magnetically coupled coil of high leakage inductance (e.g. in the 1 do 5 mH range) performs two functions. The first one is the introduction of inductance as the low-pass filters to shape the current transferred to grid connection 8, as described above. It results from the leakage inductance phenomenon that is normally treated as a parasitic phenomenon. The second function consists in using the magnetic coupling for elimination of currents that want to flow through the capacity of photovoltaic panels 9. Since the leakage current always flows through only one wiring of the low-pass filter 6, magnetic coupling causes introduction of significant inductance into its path, forming a low-pass filter of very early cut-off frequency, eliminating it effectively.
- Fig. 4 illustrates the noise characteristics of non-operating system in order to visualise the amount of interference in the system itself, concerning the background. Noise characteristics will allow to compare the leakage current waveform in the system known from the state of the art with the system according to the invention. Comparing the leakage current waveform from fig. 5 (system known from the state of the art) and fig.
- the DC/DC/AC converter constitutes a solution of higher durability and reliability, and total lower cost than the solutions known from the state of the art providing elimination of leakage current at a similar level. What's more, after placing the converter in an enclosure, the magnetic field generated by the coil does not escape, thus the negative influence upon generating emission interference has been limited.
- a block diagram of the DC/DC/AC converter system according to the second embodiment of the present invention is illustrated in fig. 3, where numerical references corresponding to the references used in the block diagram used in the first example of embodiment designate substantially the same devices /system, whereas the additionally applied modules are:
- bidirectional converter 11 is a system of two high-frequency transformers or one high-frequency transformer with an adequate number of transistors on both the primary and secondary side.
- the systems can be implemented by Flyback, Push-pull, Forward, Pull-bridge type converters.
- Controlling the transistors can take place in an open loop without feedback (signals switching the transistors on are constant in time) bye control system 10 or another control device generating signal with duty cycle of about 50%.
- the control algorithms implemented in control system 10 must be modified.
- Controlling the transistors can take place in a closed loop, with feedback in the form of voltage and current measurements, control system 10 will generate control signals depending on those measurements, and the algorithms implemented in control system 10 need not to be modified.
- the primary and secondary wiring must be selected in such a way that, for the preset rated conditions, controlling will enable matching the voltages, mainly do the DC-Link bus.
- bidirectional converter 11 must be equipped with snubbers and have voltage parameters for transistors and diodes so selected that they are not exposed to damage during operation .
- external communication device 12 has been connected to control system 10, that enables communication between DSP processor 10 and the external world, and enables: limiting the power transferred to the grid (meeting the condition for some installations where energy transmission to the grid is not allowed) , and controlling both capacitive and inductive reactive power.
- external communication device 12 comprises a wireless meter and a communication module.
- the wireless meter consists of a processor based measurement system with DSP functions with Rogowski coils connected thereto.
- the measurement system measures voltages and currents in a three-phase system, and based on those data, carries out analyses of, among others, active, reactive, and apparent powers, voltage and current harmonics, and phase shift. These data are sent wireless to the communications module.
- the communications module consists mainly of a processor with an ARM core, or an FPGA system. It has many communication channels and enables sending/receiving data from the Internet and propagating them within the converter system elements .
- the communications module By receiving data from a wireless meter it is possible to control individual DC/DC/AC converter presets by transmitting them to control system 10.
- Controlling the reactive power and the active power (energy transferred to the grid) takes place by inputting the presets originating from the external communication device 12 to individual algorithms implemented in the control system 10.
- the functionality of the DC/DC/AC converter is provided as in Example 1, enriching its operation by the possibility to adjust the power transferred to the grid and reactive power consumption, which is particularly advantageous in case of large production plants using RES.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
- Control Of Electrical Variables (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL412104A PL229067B1 (en) | 2015-04-24 | 2015-04-24 | Circuit of the DC/DC/AC converter |
PCT/PL2016/050014 WO2016171575A1 (en) | 2015-04-24 | 2016-04-21 | Dc/dc/ac converter system |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3286826A1 true EP3286826A1 (en) | 2018-02-28 |
Family
ID=56264017
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16732784.0A Withdrawn EP3286826A1 (en) | 2015-04-24 | 2016-04-21 | Dc/dc/ac converter system |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3286826A1 (en) |
PL (1) | PL229067B1 (en) |
WO (1) | WO2016171575A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111900754A (en) * | 2020-07-20 | 2020-11-06 | 广州智光电气技术有限公司 | Parallel energy storage system converter control method and device and parallel energy storage system |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107894544B (en) * | 2017-11-16 | 2019-11-26 | 广东电网有限责任公司佛山供电局 | A kind of localization method of region direct-current ground potential fluctuation sources |
CN111654183B (en) * | 2020-06-12 | 2021-10-29 | 深圳英飞源技术有限公司 | DC-DC conversion device and control method thereof |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004030912B3 (en) | 2004-06-25 | 2006-01-19 | Sma Technologie Ag | Method for converting a direct electrical voltage of a DC voltage source, in particular a photovoltaic DC voltage source into an AC voltage |
WO2011087045A1 (en) * | 2010-01-13 | 2011-07-21 | 株式会社 東芝 | Grid-tie inverter |
AU2011313939B2 (en) * | 2010-10-12 | 2015-04-09 | American Superconductor Corporation | Centralized power conditioning |
CN203840049U (en) * | 2011-09-09 | 2014-09-17 | 三洋电机株式会社 | Power storage system, charging and discharging circuit, and grid-connected device |
-
2015
- 2015-04-24 PL PL412104A patent/PL229067B1/en unknown
-
2016
- 2016-04-21 EP EP16732784.0A patent/EP3286826A1/en not_active Withdrawn
- 2016-04-21 WO PCT/PL2016/050014 patent/WO2016171575A1/en active Application Filing
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111900754A (en) * | 2020-07-20 | 2020-11-06 | 广州智光电气技术有限公司 | Parallel energy storage system converter control method and device and parallel energy storage system |
CN111900754B (en) * | 2020-07-20 | 2022-02-08 | 广州智光电气技术有限公司 | Parallel energy storage system converter control method and device and parallel energy storage system |
Also Published As
Publication number | Publication date |
---|---|
PL229067B1 (en) | 2018-06-29 |
WO2016171575A1 (en) | 2016-10-27 |
PL412104A1 (en) | 2016-11-07 |
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