公开(公告)号：US10707791B2

公开(公告)日：2020-07-07

申请号：US15527852

申请日：2015-11-18

申请人： Kansas State University Research Foundation

发明人： Behrooz Mirafzal

IPC分类号： H02P9/00 ,  H02P9/30 ,  F03D15/20 ,  F03D7/02 ,  H02P27/06 ,  F03D9/25 ,  F03B17/06 ,  H02M5/458 ,  H02M7/219 ,  H02M7/5387 ,  H02P101/15 ,  H02P101/10 ,  H02P101/20

摘要： An electrical generator (114) and a power electronics interface (115) for a direct-drive turbine (110). The turbine (110) may include a rotor (112) for transforming kinetic (from, e.g., wind, water, steam) into mechanical energy, the generator (114) for transforming the mechanical into electrical energy, and the power electronics interface (115) for conditioning the electrical energy for delivery to a power distribution grid (124). The interface (115) includes a three-phase single-stage boost inverter (120) for converting a lower DC voltage into a higher AC voltage, and which uses a synchronous reactance of the generator (114) as a DC-link inductance. The turbine (110) has neither the gearbox of indirect-drive designs nor the electrolytic capacitor bank of conventional direct-drive designs, while still allowing for a substantially smaller number of generator poles, resulting in reduced size, weight, complexity, and cost.

公开(公告)号：US11081990B2

公开(公告)日：2021-08-03

申请号：US16645106

申请日：2018-08-21

申请人： Siemens Aktiengesellschaft

发明人： Matthias Kowalski ,  Roland Sievert

IPC分类号： H02P9/08 ,  F01D15/10 ,  F01D19/02 ,  F01D25/12 ,  F01K7/16 ,  H02P101/20

摘要： A method for operating a steam turbine, wherein the pressure of the cooling medium in the generator is changed not only for cooling but also for increasing or decreasing the torque of the generator on the steam turbine, this being utilized for the purpose of the start-up or shut-down process.

公开(公告)号：US11171589B2

公开(公告)日：2021-11-09

申请号：US16689308

申请日：2019-11-20

申请人： Mitsubishi Power Americas, Inc.

发明人： Schwartz Thangyah

IPC分类号： H02P9/00 ,  H02P9/08 ,  H02P101/20

摘要： A method for starting a steam turbine can comprise electrically decoupling a generator configured to be driven by the steam turbine from a power supply, controlling power from the power supply to a frequency converter, and operating the generator as a starter motor with power from the frequency converter to turn the steam turbine. A power plant system can comprise a steam turbine, a generator configured to be driven by the steam turbine to supply power to a grid system, a first switch to electrically couple and decouple the generator from the grid system, a frequency converter electrically coupled to the generator, and a second switch to electrically couple and decouple the frequency converter form the grid system.

公开(公告)号：US11329583B2

公开(公告)日：2022-05-10

申请号：US17118086

申请日：2020-12-10

申请人： Weizhong Feng

发明人： Weizhong Feng

IPC分类号： H02P9/42 ,  H02P9/06 ,  F01D15/10 ,  F01D15/12 ,  H02P101/20

摘要： A generalized frequency conversion system for a steam turbine generator unit. The system comprises at least a variable speed steam turbine with an adjustable rotating speed, a water feeding pump, a variable frequency generator operating at a variable speed, a speed increasing gearbox with a fixed rotating speed ratio, a variable frequency bus and an auxiliary machine. With a change in load of the unit, parameters of steam entering the variable speed steam turbine and an extracted steam amount are adjusted (changed) accordingly, so that the rotating speed of the steam turbine changes accordingly. In this way, on one hand, the rotating speed of the water feeding pump is changed through the speed increasing gearbox; and on the other hand, the frequency of alternating current outputted by the variable frequency generator is changed. In the present invention, there is no need to additionally provide other types of frequency converters, and the system is simple, reliable, low in cost and high in efficiency.