JP3549043B2 - Automatic voltage regulator for AC generator - Google Patents
Automatic voltage regulator for AC generator Download PDFInfo
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- JP3549043B2 JP3549043B2 JP20012099A JP20012099A JP3549043B2 JP 3549043 B2 JP3549043 B2 JP 3549043B2 JP 20012099 A JP20012099 A JP 20012099A JP 20012099 A JP20012099 A JP 20012099A JP 3549043 B2 JP3549043 B2 JP 3549043B2
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- Prior art keywords
- generator
- rectifier
- current
- voltage regulator
- circuit
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Description
【０００１】
【発明の属する技術分野】
一般に交流発電機（以下単に発電機という）は、自動電圧調整装置（以下単にＡＶＲという）により、発電機の界磁電流が制御され発電機出力電圧を所望の値に保っている。この時のＡＶＲ入力電源は、発電機の出力電圧である。そのため、発電機の負荷側にて短絡事故が生じた場合には、発電機の出力電圧が低下するため、界磁電流を確保できなくなり、短絡電流を持続できなかった。
本発明は発電機の負荷側にて短絡事故が生じた場合においても、該発電機の短絡電流を持続させるための自動電圧調整装置に関するものである。
【０００２】
【従来の技術】
発電機の負荷側にて短絡事故が生じた場合、短絡電流を持続させる方式としては以下に示すものが一般的である。
１．発電機の回転子軸にＰＭＧ（永久磁石発電機）を直結させ、これにより発生する電源を自動電圧調整装置に供給し、発電機界磁電流を得ることにより短絡電流を持続するＰＭＧ方式。（詳細は、安川電機技報第４４巻「最近の交流発電機励磁・制御装置」による。）
２．交流発電機の端子電圧に比例した励磁電流成分を直列リアクトルを通して、
また負荷電流に比例した励磁電流成分を電力変流器よりそれぞれ得、両電流を合成し、これを直流に変換して発電機界磁電流を得ることにより短絡電流を持続する複巻自励方式。（詳細は１項同様、安川電機技報第４４巻「最近の交流発電機励磁・制御装置」による。）
【０００３】
【発明が解決しようとする課題】
しかしながら、上述１のＰＭＧ方式では発電機本体に直結したＰＭＧ装置を取り付ける必要があり、又上述２の複巻自励方式では直列リアクトル及び電力変流器を取り付ける必要があり、いずれの方式においても、コンパクト化・低価格化を実現する上での問題点となっていた。
【０００４】
【課題を解決するための手段】
本発明は上述した問題点を解決すべく創案されたもので、発電機の負荷側にて短絡事故が生じた場合でも、以下に述べる手段で短絡電流を持続させようとするものである。
交流発電機の出力電圧を入力とする第一の整流器と、この整流器の出力を、スイッチング素子を介して前記交流発電機の界磁回路に供給する自動電圧調整装置において、バッテリと第二の整流器より成る直列回路を、前記第一の整流器と並列に、かつ、同一方向に電流を流し得る極性に接続する。
【０００５】
【発明の実施の形態】
図１は本発明の実施例である。負荷（８）に接続される発電機（１）の出力が、励磁トランス（２）及び整流器（３）を介してスイッチング素子（６）と発電機の界磁回路（７）に接続され、さらに該整流器（３）と並列にバッテリ（４）と整流器（５）を直列に接続した回路において、まず発電機（１）の出力が励磁トランス（２）及び整流器（３）を介して直流電源とし、スイッチング素子（６）で制御され発電機の励磁電流として発電機の界磁回路（７）に給電される。この時、バッテリ（４）の出力電圧は前記直流電源電圧よりも低く選定しているので、発電機の界磁回路（７）へ給電することはない。
【０００６】
発電機（１）の負荷（８）にて短絡事故が生じた場合、発電機（１）の端子電圧が低下するため、励磁トランス（２）及び整流器（３）を介して直流電源とし、発電機の励磁電流を発電機の界磁回路（７）に供給することが不可能となるが、該直流電源よりバッテリ（４）の出力電圧が高くなるため、バッテリ（４）の出力が発電機の励磁電流として整流器（５）を介して発電機の界磁回路（７）に供給されるので、交流発電機の短絡電流を持続することが出来る。
【０００７】
【発明の効果】
以上述べたごとく、本発明によれば、発電機の軸に直結させたＰＭＧ、又は直流リアクトルや電力変流器などの装置が不要となって、コンパクト化及び低価格化が実現可能となり、実用上極めて有用である。
【図面の簡単な説明】
【図１】図１に本発明の実施例を示す。
【符号の説明】
１ 発電機
２ 励磁トランス
３ 整流器
４ バッテリ
５ 整流器
６ スイッチング素子
７ 発電機の界磁回路
８ 負荷
９ ＡＶＲ[0001]
TECHNICAL FIELD OF THE INVENTION
Generally, an alternating current generator (hereinafter simply referred to as a generator) controls a field current of the generator by an automatic voltage regulator (hereinafter simply referred to as an AVR) to maintain a desired output voltage of the generator. The AVR input power at this time is the output voltage of the generator. Therefore, when a short circuit accident occurs on the load side of the generator, the output voltage of the generator decreases, so that the field current cannot be secured and the short circuit current cannot be maintained.
The present invention relates to an automatic voltage regulator for maintaining a short-circuit current of a generator even when a short-circuit accident occurs on the load side of the generator.
[0002]
[Prior art]
When a short circuit accident occurs on the load side of the generator, the following method is generally used to maintain the short circuit current.
1. A PMG (Permanent Magnet Generator) is connected directly to the rotor shaft of the generator, the power generated by this is supplied to the automatic voltage regulator, and the generator field current is obtained to maintain the short-circuit current. (For details, see Yaskawa Electric Technical Report Vol. 44, "Recent AC Generator Excitation and Control Devices.")
2. An exciting current component proportional to the terminal voltage of the AC generator is passed through a series reactor,
In addition, an excitation current component proportional to the load current is obtained from each of the power transformers, the two currents are combined, and this is converted to direct current to obtain the generator field current. . (For details, as in Section 1, see Yaskawa Electric Technical Report Vol. 44, "Recent AC Generator Excitation and Control Devices.")
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned PMG system, it is necessary to attach a PMG device directly connected to the generator body, and in the above-mentioned compound-wound self-excitation system, it is necessary to attach a series reactor and a power current transformer. However, it has been a problem in realizing compactness and low price.
[0004]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-mentioned problems, and is intended to maintain the short-circuit current by the following means even when a short-circuit accident occurs on the load side of the generator.
A first rectifier having an output voltage of an alternator as an input, and an automatic voltage regulator for supplying an output of the rectifier to a field circuit of the alternator via a switching element, wherein a battery and a second rectifier are provided. A series circuit consisting of the first rectifier is connected in parallel with the first rectifier and with a polarity that allows current to flow in the same direction.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an embodiment of the present invention. The output of the generator (1) connected to the load (8) is connected to the switching element (6) and the field circuit (7) of the generator via the exciting transformer (2) and the rectifier (3), and In a circuit in which a battery (4) and a rectifier (5) are connected in series with the rectifier (3), first, the output of the generator (1) is used as a DC power supply via an exciting transformer (2) and a rectifier (3). The power is controlled by the switching element (6) and supplied to the field circuit (7) of the generator as an exciting current of the generator. At this time, since the output voltage of the battery (4) is selected to be lower than the DC power supply voltage, power is not supplied to the field circuit (7) of the generator.
[0006]
When a short-circuit accident occurs in the load (8) of the generator (1), the terminal voltage of the generator (1) decreases, so that the DC power is supplied to the generator (1) via the exciting transformer (2) and the rectifier (3). Although it becomes impossible to supply the exciting current of the machine to the field circuit (7) of the generator, the output voltage of the battery (4) becomes higher than that of the DC power supply. Is supplied to the field circuit (7) of the generator via the rectifier (5) as the exciting current of the AC generator, so that the short-circuit current of the AC generator can be maintained.
[0007]
【The invention's effect】
As described above, according to the present invention, a device such as a PMG directly connected to a shaft of a generator or a device such as a DC reactor or a power transformer is not required, so that compactness and cost reduction can be realized, and It is extremely useful.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 generator 2 excitation transformer 3 rectifier 4 battery 5 rectifier 6 switching element 7 generator field circuit 8 load 9 AVR
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20012099A JP3549043B2 (en) | 1999-07-14 | 1999-07-14 | Automatic voltage regulator for AC generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20012099A JP3549043B2 (en) | 1999-07-14 | 1999-07-14 | Automatic voltage regulator for AC generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001037297A JP2001037297A (en) | 2001-02-09 |
| JP3549043B2 true JP3549043B2 (en) | 2004-08-04 |
Family
ID=16419167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20012099A Expired - Lifetime JP3549043B2 (en) | 1999-07-14 | 1999-07-14 | Automatic voltage regulator for AC generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3549043B2 (en) |
-
1999
- 1999-07-14 JP JP20012099A patent/JP3549043B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001037297A (en) | 2001-02-09 |
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