Automatic voltage regulator, automatic voltage regulating method, generator excitation system, and power generation system

Patent metadata

Field	Value
Publication number	US-10177697-B2
Application number	US-201715787751-A
Country	US
Kind code	B2
Filing date	Oct 19, 2017
Priority date	Nov 4, 2016
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

In one embodiment, an automatic voltage regulator includes a detection instruction unit configured to monitor a generator output voltage, and output an instruction signal when the output voltage of the generator 12 deviates from a predetermined range, the instruction signal being a signal of instructing detection of a specifying parameters generated in a generator field circuit of a generator excitation system; a field-parameter detection unit configured to detect the specifying parameters following to the instruction signal; and a comparison calculator configured to calculate a comparison value between the specifying parameters and a predetermined allowable upper-limit voltage-value of each component constituting the generator excitation system.

First claim

What is claimed is:

1. An automatic voltage regulator comprising:
a detection instruction unit configured to
monitor a generator output voltage, and
output an instruction signal when the output voltage of the generator deviates from a predetermined range, the instruction signal being a signal of an instructing detection of a specifying parameters generated in a generator field circuit of a generator excitation system;

a field-parameter detection unit configured to detect the specifying parameters following to the instruction signal; and
a comparison calculator configured to calculate a comparison value between the specifying parameters and a predetermined allowable upper-limit voltage-value of each component constituting the generator excitation system.

2. The automatic voltage regulator according to claim 1 , further comprising a gate pulse regulating unit configured to regulate a gate pulse to be inputted to a sub-excitation field coil based on the comparison value in such a manner that a field voltage outputted to the generator field circuit does not exceed an allowable value of the field voltage.

3. The automatic voltage regulator according to claim 1 , further comprising a generator-voltage detection comparison unit configured to
monitor the output voltage of the generator, and
inform the detection instruction unit of occurrence of an irregular state when the output voltage of the generator deviates from the predetermined range, the irregulars state indicating that the output voltage of the generator has deviated from the predetermined range.

4. The automatic voltage regulator according to claim 1 , further comprising:
a generator field circuit configured to excite a generator field coil;
an output terminal configured to be connected with the generator field circuit and output the specifying parameters; and
a driver unit configured to operate by receiving the instruction signal and bring at least one pair of detection terminals of the field-parameter detection unit into contact with the output terminal,
wherein an excitation device of the generator excitation system is a brushless excitation device.

5. The automatic voltage regulator according to claim 1 ,
wherein an excitation device of the generator excitation system is a thyristor excitation device.

6. The automatic voltage regulator according to claim 4 ,
wherein the at least one pair of detection terminals comprises two or more pairs of detection terminals connected in parallel with each other.

7. The automatic voltage regulator according to claim 6 , further comprising:
a counter configured to count time till an end of a product life-cycle of a pair of detection terminals; and
a switching unit configured to switch a pair of detection terminals used for detecting the specifying parameters from a pair of detection terminals to another spare pair of detection terminals, in accordance with time counted by the counter.

8. The automatic voltage regulator according to claim 4 , further comprising a failure detection unit configured to detect irregularity of at least one pair of detection terminals based on a voltage value detected by the field-parameter detection unit when the at least one pair of detection terminals are brought into contact with the generator field circuit.

9. A generator excitation system comprising the automatic voltage regulator according to claim 1 .

10. A power generation system comprising the automatic voltage regulator according to claim 1 .

11. An automatic voltage regulating method comprising:
monitoring a generator output voltage;
outputting an instruction signal when the output voltage of the generator deviates from a predetermined range, the instruction signal being a signal of instructing detection of a specifying parameters generated in a generator field circuit of a generator excitation system;
setting an allowable upper limit value of the specifying parameters;
detecting the specifying parameters following to the instruction signal; and
calculating a comparison value between the specifying parameters and a predetermined allowable upper-limit voltage-value of each component constituting the generator excitation system.

12. An automatic voltage regulator comprising:
memory circuitry configured to store a predetermined program; and
processing circuitry configured, by executing the program, to
monitor a generator output voltage,
output an instruction signal when the output voltage of the generator deviates from a predetermined range, the instruction signal being a signal of instructing detection of a specifying parameters generated in a generator field circuit of a generator excitation system;
set an allowable upper limit value of the specifying parameters;
detect the specifying parameters following to the instruction signal; and
calculate a comparison value between the specifying parameters and a predetermined allowable upper-limit voltage-value of each component constituting the generator excitation system.

Assignees

• Toshiba Kk

Inventors

• Mukoyama Shinji
• Shibata Masahiko
• Hiramatsu Daisuke
• Uemura Yoichi
• Nozaki Dai
• Suzuki Kazuhiro
• Iwashita Daisuke
• Niida Kuniomi
• Tsujikawa Kazuma
• Okinaka Akira
• Arai Yutaro
• Sato Masataka

Classifications

• H02P9/006 Primary

  Means for protecting the generator by using control (control effected upon generator excitation circuit to reduce harmful effects of overloads or transients H02P9/10) · CPC title

• H02P9/14 Primary

  by variation of field (H02P9/08, H02P9/10 take precedence) · CPC title

• H02P9/302

  Brushless excitation · CPC title

• H02P9/102 Primary

  for limiting effects of transients · CPC title