Synchronous power-on/off control method and synchronous power-on/off controller

Patent metadata

Field	Value
Publication number	US-10742041-B2
Application number	US-201616082350-A
Country	US
Kind code	B2
Filing date	Mar 7, 2016
Priority date	Mar 7, 2016
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

A power-on/off command is output to a breaker for switching when a frequency difference between a plurality of electric power supply sources is within a predetermined range and a phase difference between the plurality of electric power supply sources is within a predetermined range, in switching of electric power supply between the plurality of electric power supply sources. A generator drive rotation speed of a transmission device is feedback controlled so that the frequency difference is maintained at a value within the predetermined range and the phase difference is maintained at a value within the predetermined range when the detected frequency difference is within the predetermined range and the detected phase difference is within the predetermined range. A generator rotation speed command is calculated by adding to the rotation speed command of the transmission device an output value obtained by subjecting the detected phase difference to a proportional-integral-control.

First claim

The invention claimed is:

1. A synchronous power-on/off control method in which a power-on/off command is output to a breaker for switching in a case where a frequency difference between a plurality of electric power supply sources is within a predetermined range and a phase difference between the plurality of electric power supply sources is within a predetermined range, in switching of electric power supply between the plurality of electric power supply sources, at least one of the plurality of electric power supply sources including an electric generator which is driven by a driving power source via a transmission device, the synchronous power-on/off control method comprising:
detecting the frequency difference and the phase difference between the plurality of electric power supply sources;
determining whether or not the detected frequency difference is within the predetermined range, and whether or not the detected phase difference is within the predetermined range;
feedback controlling a generator drive rotation speed of the transmission device so that the frequency difference is maintained at a value within the predetermined range and the phase difference is maintained at a value within the predetermined range, in a case where it is determined that the detected frequency difference is within the predetermined range and the detected phase difference is within the predetermined range;
controlling the generator drive rotation speed of the transmission device by providing an offset to a rotation speed command of the transmission device, in a case where it is determined that the detected frequency difference is not within the predetermined range and the detected phase difference is not within the predetermined range; and
calculating a generator rotation speed command by adding to the rotation speed command of the transmission device an output value obtained by subjecting the detected phase difference to a proportional-integral-control, feedback controlling the generator drive rotation speed based on the generator rotation speed command, and outputting the power-on/off command to the breaker, in a case where it is determined that the detected frequency difference is within the predetermined range and the detected phase difference is within the predetermined range.

2. The synchronous power-on/off control method according to claim 1 , further comprising:
detecting a voltage difference between the plurality of electric power supply sources, and outputting a field current command to the electric generator so that the detected voltage difference is within a predetermined range; and
outputting the power-on/off command to the breaker in a case where the detected voltage difference is within the predetermined range, the frequency difference between the plurality of electric power supply sources is within the predetermined range and the phase difference between the plurality of electric power supply sources is within the predetermined range.

3. The synchronous power-on/off control method according to claim 1 , further comprising:
determining which of the plurality of electric power supply sources is connected to a load, and shifting the predetermine ranges so that a frequency of the electric power supply source connected to the load is lower than a frequency of the electric power supply source which is not connected to the load and a phase of the electric power supply source connected to the load is delayed with respect to a phase of the electric power supply source which is not connected to the load.

4. The synchronous power-on/off control method according to claim 1 ,
wherein the transmission device includes a toroidal continuously variable transmission.

5. The synchronous power-on/off control method according to claim 4 ,
wherein a tilt motion angle of a power roller included in the transmission device is adjusted by a hydraulic servo system,
wherein the hydraulic servo system includes a hydraulic actuator and a servo valve which drives the hydraulic actuator, and
wherein the servo valve is driven by a servo valve opening rate command based on an output rotation speed of the driving power source, the generator drive rotation speed of the transmission device, and the generator rotation speed command.

6. The synchronous power-on/off control method according to claim 4 ,
wherein the toroidal continuously variable transmission includes a clamping mechanism which generates a clamping force for pushing a power roller against an input disc and an output disc included in the transmission device.

7. The synchronous power-on/off control method according to claim 1 ,
wherein the driving power source is an engine for an aircraft.

8. A synchronous power-on/off controller in which a power-on/off command is output to a breaker for switching in a case where a frequency difference between a plurality of electric power supply sources is within a predetermined range and a phase difference between the plurality of electric power supply sources is within a predetermined range, in switching of electric power supply between the plurality of electric power supply sources, at least one of the plurality of electric power supply sources including an electric generator which is driven by a driving power source via a transmission device, the synchronous power-on/off controller comprising:
a frequency difference detector which detects the frequency difference between the plurality of electric power supply sources;
a phase difference detector which detects the phase difference between the plurality of electric power supply sources; and
a synchronous power-on/off control unit which determines whether or not the detected frequency difference is within the predetermined range and whether or not the detected phase difference is within the predetermined range, generates the power-on/off command, and outputs the power-on/off command to the breaker,
wherein the synchronous power-on/off control unit feedback-controls a generator drive rotation speed of the transmission device so that the frequency difference is maintained at a value within the predetermined range and the phase difference is maintained at a value within the predetermined range, in a case where the synchronous power-on/off control unit determines that the detected frequency difference is within the predetermined range and the detected phase difference is within the predetermined range,
wherein the synchronous power-on/off control unit controls the generator drive rotation speed of the transmission device by providing an offset to a rotation speed command of the transmission device, in a case where the synchronous power-on/off control unit determines that the detected frequency difference is not within the predetermined range and the detected phase difference is not within the predetermined range, and
wherein the synchronous power-on/off control unit calculates a generator rotation speed command by adding to the rotation speed command of the transmission device an output value obtained by subjecting the detected phase difference to a proportional-integral-control, feedback-controls the generator drive rotation speed based on the generator rotation speed command, and outputs the power-on/off command to the breaker, in a case where the synchronous power-on/off control unit determines that the detected frequency difference is within the predetermined range and the detected phase difference is within the predetermined range.

9. The synchronous power-on/off controller according to claim 8 , further comprising:
a voltage difference detector which detects a voltage difference between the plurality of electric power supply sources; and
a voltage adjustment unit which outputs a field current command to the ele

Assignees

• Kawasaki Heavy Ind Ltd

Inventors

• Goi Tatsuhiko
• Nakashima Kenichi
• Sugimoto Kazushige
• Higashi Masaaki

Classifications

• H02H3/48

  responsive to loss of synchronism · CPC title

• H02H3/46

  responsive to frequency deviations · CPC title

• F05D2270/64

  Hydraulic actuators · CPC title

• F05D2270/061

  in particular the electrical frequency of driven generator · CPC title

• F05D2260/4023

  through a friction clutch · CPC title