摘要:
Systems 10 and methods 300 for converting power are presented. The power conversion includes conducting load current through a first current path 92 of multiple current paths in a power conversion unit 12 using switches 60, diodes 74, or a combination thereof. The power conversion also includes blocking one or more additional current paths 94 of the multiple current paths in the power conversion unit 12 using one or more of the switches 60, one or more of the diodes 74, or a combination thereof. Furthermore, the power conversion includes reducing potential voltage stress on the one or more switches 60 by using one or more voltage stress reduction switches to reduce a voltage that is blocked by the one or more blocking switches or diodes 74 by connecting an end of each of the one or more switches 60 opposite to a blocking edge to an intermediate voltage node 84.
摘要:
A commutation control circuit includes an integrating voltage counter (116) electrically coupled to an electrical power bus, the integrating voltage counter configured to integrate over time a voltage signal received from the power bus and to generate a trigger signal when the integrated voltage signal equals a predetermined count, and a plurality of transistor pairs (108) configured to receive a trigger signal generated by the integrating voltage counter and electrically coupled to respective electrical windings (110).
摘要:
The present subject matter is directed to apparatus 150 and methods for producing a variable frequency output waveform from a power converter 162 for use in a power generation system, such as a wind turbine power generation system 11. A voltage divider is employed to provide plural voltage levels to which a multi-level bridge circuit employing selectively activated switches (1 ... 14) in pairs of switches is coupled. The switches (1 ... 14) are operated in such a fashion as to produce a generally sinusoidal waveform that may be easily filtered by low cost filters 110 due to the plural voltage levels to produce a generally smooth sine wave from the converter 162. Such converters 162 may be used in various environments including in pairs in multi-phase power converters.
摘要:
A control system 30 for determining a desired mission is provided. The control system 30 includes an interface 42 for receiving a mission input and a control module 46. The control module 46 is in communication with the interface 42, and determines the desired mission. The desired mission represents a specific conclusion based on analyzing data located in at least one database. The control module 46 includes a transform avatar 66 for determining a proposed transform 120 based on the mission input. The proposed transform 120 is a defined set of rules to determine the desired mission based on the data located in at the least one database. The control module 46 includes a calculation avatar 72 receiving the proposed transform 120. The calculation avatar 72 analyzes the data located in the at least one database based on the proposed transform 120 to determine the desired mission.
摘要:
A system and method for detecting a grid event is provided. The method includes sampling 502 grid voltage and grid current over a fixed period of time; determining 504 grid impedance at one or more frequencies using the sampled grid voltage and the sampled grid current; comparing 506 the grid impedance at the one or more frequencies to a known expected grid impedance at the one or more frequencies; and detecting 508 a grid event based on the comparison.
摘要:
A power conversion system (14) for providing power to an electrical grid (22) is described. The system includes a boost converter (24) coupled to a photovoltaic (PV) array (12) and configured to control a PV array voltage. The system also includes an inverter (26) coupled to the boost converter by at least one conductor (36) and configured to regulate a voltage drop across the at least one conductor. The system also includes a system controller (16) configured to control operation of the boost converter and the inverter.
摘要:
A commutation control circuit includes an integrating voltage counter (116) electrically coupled to an electrical power bus, the integrating voltage counter configured to integrate over time a voltage signal received from the power bus and to generate a trigger signal when the integrated voltage signal equals a predetermined count, and a plurality of transistor pairs (108) configured to receive a trigger signal generated by the integrating voltage counter and electrically coupled to respective electrical windings (110).
摘要:
A power conversion system (14) for providing power to an electrical grid (22) is described. The system includes a boost converter (24) coupled to a photovoltaic (PV) array (12) and configured to control a PV array voltage. The system also includes an inverter (26) coupled to the boost converter by at least one conductor (36) and configured to regulate a voltage drop across the at least one conductor. The system also includes a system controller (16) configured to control operation of the boost converter and the inverter.
摘要:
An electrical system for connecting a wind turbine 10 to a power grid 179 that includes: a frequency converter 103 that converts electric power produced by a generator 101 of the wind turbine 10 into electric power that is synchronized with the electric power of the power grid 179; a transformer 181 that steps up the voltage for connection to the power grid 179, the transformer 181 being disposed between the frequency converter 103 and a connection to the power grid 179; and a grid-side crowbar circuit 302; wherein the grid-side crowbar circuit 302 is configured to apply a short circuit to the electrical system upon the detection of a fault.