Electric Power Generation System

Patent metadata

Field	Value
Publication number	US-2024396481-A1
Application number	US-202218689527-A
Country	US
Kind code	A1
Filing date	Oct 17, 2022
Priority date	Oct 28, 2021
Publication date	Nov 28, 2024
Grant date	—

Abstract

An object of the present invention is to provide an electric power generation system that can stably control, with one electric power converter, output electric power of a main winding and an auxiliary winding of a dual-winding induction electric power generator. For this purpose, in an electric power generation system including an electric power generator having a stator including a main winding and an auxiliary winding, a rectifier connected to the main winding, an electric power converter that is connected to the auxiliary winding and controls voltages of the main winding and the auxiliary winding, and a controller that outputs a control signal according to a voltage command value of the auxiliary winding to the electric power converter, the controller calculates a voltage change amount of the auxiliary winding generated by interference of a magnetic flux of the main winding with the auxiliary winding, on the basis of a current and the voltage of the main winding, and adds the voltage change amount to the voltage command value of the auxiliary winding.

First claim

1 . An electric power generation system comprising:
an electric power generator having a stator including a main winding and an auxiliary winding; a rectifier connected to the main winding; an electric power converter that is connected to the auxiliary winding and controls voltages of the main winding and the auxiliary winding; and a controller that outputs a control signal according to a voltage command value of the auxiliary winding to the electric power converter, wherein the controller is configured to calculate a voltage change amount of the auxiliary winding generated by interference of a magnetic flux of the main winding with the auxiliary winding, on a basis of a current and the voltage of the main winding, and add the voltage change amount to the voltage command value of the auxiliary winding.

2 . The electric power generation system according to claim 1 , comprising:
a voltage sensor that senses the voltage of the main winding; and a current sensor that senses the current of the main winding, wherein the controller is configured to calculate, as the voltage change amount, a difference between a product of the current of the main winding and a main winding resistance related to the auxiliary winding and the voltage of the main winding.

3 . The electric power generation system according to claim 1 , wherein the controller is configured to calculate, as the voltage change amount, a difference between a product of the current of the main winding and a main winding resistance related to the auxiliary winding and an estimated main winding voltage value obtained by multiplying a voltage command of the electric power converter by a correction gain.

Assignees

• Hitachi Construction Mach Co

Inventors

• Matsuo Kosuke
• Kaneko Satoru
• Yoshimura Masatoshi
• Nishihama Kazuo
• Ishida Seiji
• Watanable Toshihiko
• Ikegami Tokuma

Classifications

• H02P2207/01

  Asynchronous machines · CPC title

• H02P2103/10

  of the asynchronous type · CPC title

• H02P9/10

  Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load · CPC title

• H02P21/06

  Rotor flux based control involving the use of rotor position or rotor speed sensors · CPC title

• H02P25/22

  Multiple windings; Windings for more than three phases · CPC title