Patent application number | Description | Published |
20080203820 | Backup power system - The subject matter of the invention is a backup power system configured to be a UPS system, with a customer generation system ( | 08-28-2008 |
20090244936 | Three-phase inverter - The present invention relates to a three-phase inverter ( | 10-01-2009 |
20100020576 | Power Converter Circuitry - A power converter circuitry for converting a DC voltage generated by a generator with varying output power in the mean voltage range into an alternating voltage for feeding into a grid, with several series-connected power converters, which are connected in parallel with said generator, as well as with a controllable bridging switch for each power converter, said bridging switch lying in a direct voltage intermediate circuit and bridging the respective power converter in the closed condition, is intended to be used for a photovoltaic generator. This is achieved in that a resistance chopper is connected between each power converter and the generator, no input diode being provided in the current path from the generator to the power converter, and that each bridging switch is connected in parallel with the resistance chopper in the direct voltage intermediate circuit. | 01-28-2010 |
20100124087 | POWER CONVERTER START-UP CIRCUIT - A power converter arrangement configured to convert a direct voltage into an alternating voltage to be supplied to a grid includes a photovoltaic generator configured to generate the direct voltage, a voltage intermediate circuit, a main power converter connected in series with a bypass switch, a maximum power point controller configured to set a maximum power point voltage, and at least one voltage-limited additional circuit configured to be active during a start-up phase of the photovoltaic generator. The at least one voltage-limited additional circuit and the main power converter are configured as a voltage divider in parallel with the photovoltaic generator. The at least one voltage-limited additional circuit is configured as a capacitive voltage divider having a first capacitor and an intermediate circuit capacitor connected in series. | 05-20-2010 |
20110031813 | Method and Circuit Arrangement for Connecting at Least One String of a Photovoltaic System to an Inverter - A circuit arrangement in combination with a first string of series-connected solar modules separated into a first substring and a second substring is provided, wherein each substring includes a first terminal and a second terminal, and further in combination with a solar inverter configured to supply electrical energy from the solar modules to an AC power grid. The arrangement includes a first switch configured to selectively couple the first terminal of the first substring to a first power cable of the inverter, and a second switching circuit configured to selectively couple the second terminal of the first substring to a first terminal of the second substring at a center point, thereby coupling the first and second substrings to form the at least one string. The arrangement further includes a third switch configured to selectively couple the second terminal of the second substring to a second power cable of the inverter, and a shared actuator configured to open the first switch, the second switching circuit, and the third switch if a current between the center point and a circuit ground exceeds a threshold value. | 02-10-2011 |
20110197946 | Lightning Protection for Power Inverters - An inverter includes two input lines for connecting the inverter to an AC power source, a buffer capacitance effective between the input lines, a grounded potential equalization busbar, an isolation monitoring device monitoring the electrical isolation of one of the two input lines with regard to the potential equalization busbar, and an overvoltage eliminating device having at least one overvoltage eliminator for draining overvoltages from the input lines to the potential equalization busbar. The at least one overvoltage eliminator is connected between that input line, whose electric isolation with regard to the potential equalization busbar is monitored, and the potential equalization busbar, without any fuse being connected in series with the at least one overvoltage eliminator. Any overvoltage eliminator of the overvoltage eliminating device, which is connected between the other of the two input lines and the potential equalization busbar, if present, is connected in series with a fuse. | 08-18-2011 |
20120039101 | Method of and Apparatus for Connecting a Photovoltaic Device to an AC Power Grid - A method of connecting a photovoltaic device to an AC power grid through an inverter includes monitoring a DC voltage at an input of an inverter, and activating the inverter when the monitored DC voltage exceeds a first predetermined threshold. The method further includes synchronizing an output voltage of the inverter with a grid voltage, connecting an output of the inverter to the AC power grid upon synchronization if the monitored DC voltage exceeds a second predetermined threshold, and deactivating the inverter if a detected power being fed through the inverter falls below a predetermined power threshold while maintaining the connection between the output of the inverter and the AC power grid. Lastly, the method includes disconnecting the output of the deactivated inverter from the grid if the monitored DC voltage falls below a third predetermined threshold. Further, an apparatus that performs such functionality is also provided. | 02-16-2012 |
20120126626 | DEVICE FOR SUPPLYING ELECTRICAL ENERGY FROM A PLURALITY OF STRINGS OF PHOTOVOLTAIC MODULES TO A POWER GRID - In a device for supplying electrical energy from a plurality of strings of photovoltaic modules to a power grid that includes a connection terminal for each string of the plurality of strings, wherein each connection terminal includes an over-current protection component including a power switch for selectively disconnecting the respective string. The device further includes a central insulation monitoring unit providing an insulation status of the entire plurality of strings, and the power switch of each over-current protection component includes an all-pole disconnecting power switch that can be opened and closed by a controller via a motor in response to the insulation status provided by the central insulation monitoring unit to select and selectively disconnect a string having an insulation failure. The device is further configured to supply electrical energy from the remaining strings of the plurality of strings having no insulation failure. | 05-24-2012 |
20120243279 | Buck Converter and Inverter Comprising the same - A buck converter for converting a DC voltage at input terminals into an output voltage at output terminals is disclosed. The buck converter includes a DC voltage link including a series-connection of at least two capacitors between the output terminals, and one subcircuit per each capacitor of the series-connection. Each subcircuit includes an inductor and a freewheeling diode. A first one of the input terminals is connected to a first output terminal by a series-connection of a semiconductor switch and the inductor of a first one of the subcircuits, and the subcircuits are coupled for balancing the voltages across their inductors. The buck converter may be used upstream of an inverter bridge of an inverter, such that a maximum voltage at the input terminals may exceed a maximum voltage rating of the bridge switches within the inverter. | 09-27-2012 |
20130028000 | APPARATUS FOR CONVERTING ELECTRIC ENERGY AND METHOD FOR OPERATING SUCH AN APPARATUS - A device for converting direct voltage from an electrochemical store or a fuel cell to alternating voltage, includes a two-stage design having a single DC/DC converter stage for generating an intermediate circuit voltage from the output voltage of the electrochemical store or the fuel cell, which converter stage converts, in particular raises, the direct voltage in a wide input voltage range directly to an intermediate circuit voltage with which a DC/AC converter stage can be operated to generate the alternating voltage. The single DC/AC converter stage generates the alternating voltage from the intermediate circuit voltage. The invention further relates to a method for actuating a device for converting direct voltage from a store or energy generator into alternating voltage for feeding into a supply network. | 01-31-2013 |
20130221755 | Circuit Arrangement for Setting a Potential of a Photovoltaic Generator - A circuit arrangement for setting a potential of a photovoltaic generator with respect to a ground potential (GND) includes at least one first resistance connected between a negative output of the photovoltaic generator and a ground connection, and a series circuit including at least one second resistance and a breakdown diode connected in series between a positive output of the photovoltaic generator and the ground connection to which the ground potential (GND) is applied. Alternatively, the circuit arrangement includes at least one first resistance connected between a positive output of the photovoltaic generator and a ground connection, and a series circuit including at least one second resistance and a breakdown diode connected in series between a negative output of the photovoltaic generator and the ground connection to which the ground potential (GND) is applied. | 08-29-2013 |
20130241297 | Inverter System and Method for Operation of a Photovoltaic Installation for Feeding Electrical Power into a Medium-Voltage Power Supply Grid - The disclosure relates to a method for operation of a photovoltaic installation for feeding electrical power into a medium-voltage power supply grid, with the photovoltaic installation having a plurality of photovoltaic modules, at least one inverter and at least one medium-voltage transformer, and with the primary side of the medium-voltage transformer being connected directly to an alternating-current (AC) low-voltage output of the inverter, and at least one direct-current (DC) switching member being arranged between the photovoltaic modules and a DC input of the inverter. When the electrical power produced by the photovoltaic modules in the photovoltaic installation is not sufficient for feeding electrical power into the supply grid, the photovoltaic modules are disconnected from an inverter on the DC voltage side while, in contrast, the inverter remains connected to the medium-voltage power supply grid on the AC voltage side by the medium-voltage transformer. | 09-19-2013 |
20130244458 | Electrical Connection Between Two BusBars Made of Flat Conductors and of an Insulating Layer Disposed Between the Conductors - The disclosure relates to an electrical connection between two busbars made of flat conductors and an insulating layer disposed between the conductors at the opposite longitudinal edges of the two busbars. The two conductors of each busbar run parallel to each other at a distance on the longitudinal edge thereof, wherein a molded part made of electrically insulating material bridges the distances between the conductors of the two busbars. Electrically conductive contact elements, forced against each other but electrically insulated from each other, each contact one of the conductors of each busbar by means of structured contact surfaces and clamp the same between the element and the molded part, wherein the contact surfaces for the conductors of the two busbars including clamping protrusions running parallel to the longitudinal edges. | 09-19-2013 |
20130250641 | Method for Connecting a Photovoltaic Installation to a Power Supply - The disclosure relates to a method for connecting a photovoltaic installation to a power supply grid, the photovoltaic installation comprising a photovoltaic generator, a direct voltage intermediate circuit with at least one capacitor, and an inverter. The method including connecting the direct voltage intermediate circuit to the photovoltaic generator and the capacitor is pre-charged to a first voltage. The direct voltage intermediate circuit is then separated from the photovoltaic generator and the capacitor is discharged to or below a second voltage that corresponds to a maximum operating voltage of the inverter. The inverter is then connected to the power supply grid, an inverter bridge of the inverter is clocked, and the direct voltage intermediate circuit is connected to the photovoltaic generator. | 09-26-2013 |
20130271888 | Photovoltaic System and Apparatus for Operating a Photovoltaic System - The disclosure relates to a PV system including at least one inverter coupled to a grid via an AC disconnecting element and at least one transformer. The PV system includes at least one PV sub-generator having at least one PV string connected to a DC connection region of the inverter via DC lines. The PV system includes protection devices including a DC short-circuiting switch for short-circuiting the at least one PV string and a reverse-current protection element connected downstream thereof. The protection device includes an AC short-circuiting switch arranged upstream of the AC disconnecting element. | 10-17-2013 |
20130335861 | Method and System for Detecting an Arc Fault in a Power Circuit - The method of detecting an arc fault in a power circuit includes determining a first signal related to current flowing in the power circuit is determined and analyzing the first signal to determine whether the signal indicates the presence of an electric arc in the power circuit. In case the first signal indicates the presence of an electric arc in the power circuit, means for suppressing an electric arc are activated. A second signal related to current flowing in the power circuit is then determined and analyzed. An occurrence of an arc fault in the power circuit is signaled if the second signal does not indicate the presence of an electric arc. The system for detecting an arc fault is designed to perform a corresponding method. | 12-19-2013 |
20140119083 | DC/AC CONVERTER, POWER GENERATION PLANT AND OPERATING METHOD FOR A DC/AC CONVERTER - A DC/AC converter for converting DC power of a number of inductively connected generators into power grid conformal AC power for feeding into a connected power grid with a number of phases, includes an intermediate circuit with a positive and a negative intermediate circuit connection, and for each phase, a bridge. Each bridge includes a first switch between the positive intermediate circuit connection and a phase terminal, a second switch connected between a positive generator terminal of the generator and the phase terminal, a third switch connected between a negative generator terminal of the generator and the phase terminal, and a fourth switch between the negative intermediate circuit connection and the phase terminal. | 05-01-2014 |
20140347770 | PROTECTION OF PHOTOVOLTAIC MODULES OF A PHOTOVOLTAIC GENERATOR AGAINST SURGE VOLTAGES RELATIVE TO GROUND - For protecting a photovoltaic generator comprising photovoltaic modules, having an open circuit voltage higher than an insulation design voltage of its photovoltaic modules and being connected to an AC power grid via an inverter against a surge voltage relative to ground resulting from a ground fault and exceeding the insulation design voltage, the photovoltaic generator is surveyed for the occurrence of the ground fault or the surge voltage. Upon the actual occurrence of the ground fault or the surge voltage, at first, the photovoltaic generator is separated from an input-side intermediate link capacitance of the inverter, and the inverter is separated from the AC power grid. Then, the intermediate link capacitance is discharged via a resistor, prior to permanently closing semiconductor switches of an inverter bridge of the inverter and to reconnecting the photovoltaic generator to the input-side intermediate link capacitance of the inverter to short circuit the photovoltaic generator. | 11-27-2014 |
20150069841 | Photovoltaic System and Method for Operating a Photovoltaic System for Feeding Electrical Power into a Medium-Voltage Network - The disclosure relates to a method for operating a photovoltaic system for feeding a medium-voltage grid, wherein the photovoltaic system has a photovoltaic generator including a plurality of photovoltaic modules, at least one inverter and at least one medium-voltage transformer. The medium-voltage transformer is connected on the primary side directly to a low-voltage AC output of the inverter, the inverter is connected to the photovoltaic generator via a DC input, and the inverter permits reverse currents from the low-voltage AC output to the DC input. The method is characterized by the fact that in the event that there is insufficient generation of electric power for the feed by the photovoltaic modules, the inverter remains connected on the AC side to the medium-voltage grid via the medium-voltage transformer, and remains connected on the DC side to the photovoltaic generator. | 03-12-2015 |