Patent EA-003628-B1 (EA)
Title: Power converter with rotating/stationary communication/processing means
Inventor: GERTMAR LARS
IPC: H02P9/10
Filed: 2000-04-14
Abstract: 1. A power converter with a rotating electric main machine (1), which main machine has a rotor shaft (3), a rotor winding (7), and an alternating current stator winding (5) for coupling to a power network, a converter (4) rotating with the shaft, a first control equipment (12) rotating with the shaft, an alternating voltage source (2), a stationary second control equipment (13), and a digital wireless communication link (14,15,16,17) between the first and the second control equipment, characterized in that the rotor winding of the main machine is an alternating current winding, that the alternating voltage source is a regulating machine (2) with a rotor rotating with the shaft of the main machine and with a rotor winding (8) that is a multiphase alternating current winding, that the converter is an ac-to-ac converter (4) coupled between the rotor windings of the regulating machine and of the main machine, and that the first control equipment comprises a programmable first digital processor (12) programmed with software to, via control of amplitude and frequency of the voltage supplied to the rotor winding of the main machine, control the power converter (4) in dependence on reference values supplied from the second control equipment via the communication link. 2. A power converter as claimed in claim 1, characterized in that said first digital processor is programmed with software to control the converter to -during normal operation operate as an ac-to-ac converter, -during start-up operate as one of an alternating current multiphase coupler, an alternating current phaseangle/voltage controller, and an alternating current short-circuit coupler, and -during controlled breaking and stopping operate as one of an alternating current multiphase coupler, an alternating current phase-angle/voltage controller, and an alternating current short-circuit coupler. 3. A power converter as claimed in any of the preceding claims, characterized in that said first digital processor is programmed with software to temporarily and autonomously control the power converter in case of repeated and severe disturbances in the digital wireless communication. 4. A power converter as claimed in any of the preceding claims, characterized in that said second control equipment comprises a programmable second digital processor (13) programmed with software to generate said reference values in dependence on measured values of quantities associated with the power converter, and to communicate with super-ordinated control systems. 5. A method for power conversion with a power converter as claimed in claim 1, characterized in that reference values for the power conversion are supplied to the first control equipment from the second control equipment via the communication link, and that the first digital processor is programmed with software to control the power converter by controlling the amplitude and frequency of the voltage supplied to the rotor winding of the main machine in dependence on said reference values.