Abstract:
A method for flying start control of a motor, a computer readable medium, and a power conversion system having an inverter and a controller configured by computer executable instructions in a memory to perform flying start of a rotating motor by field weakening control to control the motor responsive to the motor speed exceeding the rated speed or other non-zero threshold at startup of the power conversion system. The method includes measuring a motor speed of a motor, responsive to startup of a power conversion system, and performing a flying start operation using field weakening control to control the motor responsive to the motor speed exceeding a non-zero threshold at startup of the power conversion system.
Abstract:
A method for operating a power generation system that supplies power for application to a load is disclosed. The method may generally include receiving, at a power converter, an alternating current power generated by a generator operating at a speed that is substantially equal to its synchronous speed and converting, with the power converter, the alternating current power to an output power, wherein the power converter includes at least one switching element. In addition, the method may include receiving a control command to control a switching frequency of the at least one switching element and adjusting the switching frequency to an adjusted switching frequency that is substantially equal to a fundamental frequency of the load.
Abstract:
A three-level power conversion apparatus can suppress fluctuation in a neutral point voltage even when operated as a reactive power regulator. The three-level power conversion apparatus is composed of first and second three-level converters connected to an AC power supply, positive side and negative side DC capacitors, a three-level inverter to drive an AC motor, and converter control unit for controlling the three-level converters. The converter control unit has first and second reactive current controllers for controlling so that reactive portions of input currents of each three-level converter become a prescribed reactive current reference, first and second neutral point voltage fluctuation suppressing units for controlling a PWM controller, to make a voltage difference of two DC capacitors zero, and an active current controller for supplying a prescribed circulating active current from one three-level converter to other three-level converter.
Abstract:
A method for stably operating a lean fuel intake gas turbine engine by controlling the rotation speed of the lean fuel intake gas turbine engine for which it is difficult to control the rotation speed by controlling a fuel flow rate, is provided. In a method for operating a lean fuel intake gas turbine engine (GT) configured to use, as a fuel, a combustible component contained in a low-concentration methane gas to drive a power generator, a power converter (17) is provided between an external electric power system (19) and the power generator (11), and a rotation speed of the power generator (11) is controlled by the power converter (17), to control a rotation speed of the gas turbine engine (GT).
Abstract:
In accordance with one or more embodiments, a method for implementing a PMG variable speed constant frequency generating system on an aircraft including an aircraft engine is provided. The method includes receiving AC power from a PMG at an AC/DC conversion stage, the received power being proportional to a rate of rotation of the aircraft engine and converting the AC power to DC power in the AC/DC conversion stage. The method further includes sensing a DC voltage output by the AC/DC conversion stage and providing the DC voltage to a DC/AC conversion stage. The method includes providing a control signal to the DC/AC conversion stage to control a frequency and a voltage of an output signal of the DC/AC conversion stage without varying an electrical signal provided to the PMG.