JPH04289733A - Step-out preventing device for ac generator - Google Patents
Step-out preventing device for ac generatorInfo
- Publication number
- JPH04289733A JPH04289733A JP3052053A JP5205391A JPH04289733A JP H04289733 A JPH04289733 A JP H04289733A JP 3052053 A JP3052053 A JP 3052053A JP 5205391 A JP5205391 A JP 5205391A JP H04289733 A JPH04289733 A JP H04289733A
- Authority
- JP
- Japan
- Prior art keywords
- power
- power generation
- generation output
- reference value
- alternator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010248 power generation Methods 0.000 claims description 68
- 238000001514 detection method Methods 0.000 claims description 17
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 230000002265 prevention Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Landscapes
- Control Of Ac Motors In General (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、安定して電力供給を行
うために用いられる交流発電機の脱調防止装置に関する
。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step-out prevention device for an alternator used to stably supply power.
【０００２】0002
【従来の技術】水力発電、火力発電等では、原動機とし
てのタービンに交流発電機を直結し、タービンの回転に
より交流発電機を回転させ、交流電力を取り出すように
している。その原動機の出力（交流発電機への入力）と
交流発電機の発電出力とは、定常状態で安定運転のとき
には等しいが、何らかの原因により安定運転状態から不
安定状態に移行すると差を生じ、交流発電機の回転数が
狂い出す。BACKGROUND OF THE INVENTION In hydroelectric power generation, thermal power generation, etc., an alternating current generator is directly connected to a turbine as a prime mover, and the alternating current generator is rotated by the rotation of the turbine to extract alternating current power. The output of the prime mover (input to the alternator) and the generated output of the alternator are equal during stable operation in a steady state, but when the state shifts from a stable operating state to an unstable state for some reason, a difference occurs and the alternating current The rotation speed of the generator goes out of order.
【０００３】図１は不安定状態におけるその交流発電機
の回転数と交流発電機の発電出力とタービンの出力（交
流発電機への入力）との関係を示している。その図１に
おいて、横軸は時間ｔを示しており、縦軸は交流発電機
の発電出力（ｐ）と交流発電機の回転数（Ｎ）とを示し
ている。二点鎖線で示す直線は原動機としてのタービン
の出力、すなわち、交流発電機への入力を示しており、
たとえば０．９ｐ．ｕである。このタービンの出力は厳
密には変動するがほぼ一定である。破線は交流発電機の
回転数曲線（Ｎ）を示しており、基準回転数はたとえば
３６００ｒｐｍである。この基準回転数Ｎが３６００ｒ
ｐｍで、交流発電機２の入力と発電出力Ｐとが一致した
時点ｔ０を事前出力時点として本例示では、２００ｍｓ
毎に各発電出力、回転数の変動曲線が示されている。そ
の交流発電機の回転数曲線（Ｎ）の第１番目の山はたと
えば３６３２回転、第１番目の谷はたとえば３５７０回
転、第２番目の山はたとえば３６３０回転、第２番目の
谷はたとえば３５５７回転を示し、最終的には交流発電
機の回転数が過大となった状態が示されている。一方、
実線は交流発電機の発電出力曲線（ｐ）を示している。
交流発電機の発電出力Ｐが原動機の出力（交流発電機へ
の入力）よりも小さいときは、斜線で示すように交流発
電機の回転数は増大し、交流発電機の発電出力Ｐが原動
機の出力よりも大きいときは、交流発電機の回転数Ｎが
減少している。そして、最終的には発電出力が減少側に
スケールオーバーして、そのため、回転数が増大し、発
電機は脱調するに至っている。FIG. 1 shows the relationship between the rotational speed of the alternator, the generated output of the alternator, and the output of the turbine (input to the alternator) in an unstable state. In FIG. 1, the horizontal axis indicates time t, and the vertical axis indicates the power output (p) of the alternator and the rotational speed (N) of the alternator. The straight line shown by the two-dot chain line shows the output of the turbine as a prime mover, that is, the input to the alternator.
For example, 0.9p. It is u. Strictly speaking, the output of this turbine varies, but it is approximately constant. The broken line shows the rotation speed curve (N) of the alternator, and the reference rotation speed is, for example, 3600 rpm. This reference rotation speed N is 3600r
pm, the time t0 at which the input of the alternator 2 and the generated output P match is the pre-output time, and in this example, 200ms
Each generation output and rotation speed fluctuation curve is shown. The first peak of the rotational speed curve (N) of the alternator is, for example, 3,632 revolutions, the first valley is, for example, 3,570 revolutions, the second peak is, for example, 3,630 revolutions, and the second valley is, for example, 3,557 revolutions. The figure shows a state in which the alternator's rotational speed becomes excessive. on the other hand,
The solid line shows the power generation output curve (p) of the alternator. When the power generation output P of the alternator is smaller than the output of the prime mover (input to the alternator), the rotation speed of the alternator increases as shown by the diagonal line, and the power generation output P of the alternator becomes smaller than that of the prime mover. When it is larger than the output, the rotation speed N of the alternator is decreasing. Eventually, the power generation output scales over to the decreasing side, and as a result, the rotational speed increases and the generator loses synchronization.
【０００４】0004
【発明が解決しようとする課題】ところで、交流発電機
の回転数が異常に大きくなったり、小さくなったり基準
回転数から大幅にずれるといわゆる脱調現象を生じ、送
電不可（電力供給不可）となる問題を生じる。[Problem to be solved by the invention] By the way, when the rotational speed of an alternator becomes abnormally high or low, or deviates significantly from the standard rotational speed, a so-called step-out phenomenon occurs, and power cannot be transmitted (power cannot be supplied). This will cause a problem.
【０００５】そこで、本発明の目的は、交流発電機の脱
調を防止する交流発電機の脱調防止装置を提供すること
にある。SUMMARY OF THE INVENTION An object of the present invention is to provide an AC generator step-out prevention device that prevents an AC generator from stepping out.
【０００６】[0006]
【課題を解決するための手段】本発明に係わる交流発電
機の脱調防止装置は、上記課題を達成するため、原動機
に直結されて回転される交流発電機の発電出力系統に接
続され該発電出力を検出する発電出力検出手段と、該発
電出力検出手段の発電出力検出値と上限基準値と下限基
準値とが入力され発電出力値が基準範囲内にあるか否か
を判断する判断手段と、前記発電出力系統に電力吸収放
出切換え手段を介して接続されて前記発電出力の一部を
貯蔵する電力貯蔵手段とを備え、前記電力吸収放出切換
え手段は前記発電出力が基準値を下回ったときに前記発
電出力系統の発電出力が前記電力貯蔵手段に吸収される
ように前記判断手段によって切り換えられ、かつ、前記
発電出力が前記上限基準値を越えたときには電力が前記
電力貯蔵手段から前記発電出力系統に向かって放出され
るように前記判断手段によって制御されることを特徴と
する。[Means for Solving the Problems] In order to achieve the above object, an AC generator step-out prevention device according to the present invention is connected to a power generation output system of an AC generator that is directly connected to a prime mover and rotates. a power generation output detection means for detecting the output; and a determination means for determining whether or not the power generation output value is within the reference range by inputting the power generation output detection value, the upper limit reference value, and the lower limit reference value of the power generation output detection means. , power storage means connected to the power generation output system via a power absorption/discharge switching means to store a part of the power generation output, and the power absorption/discharge switching means is configured to operate when the power generation output falls below a reference value. When the power generation output of the power generation output system is switched by the determination means so that it is absorbed by the power storage means, and the power generation output exceeds the upper limit reference value, electric power is transferred from the power storage means to the power generation output. It is characterized in that it is controlled by the determining means so as to be released toward the system.
【０００７】[0007]
【作 用】本発明によれば、発電出力検出手段は原動
機に直結されて回転する交流発電機の発電出力を検出す
る。判断手段はその発電出力検出手段の発電出力検出値
と下限基準値及び上限基準値とを比較する。下限基準値
、上限基準値は原動機の定格出力が交流発電機の発電出
力と等しい定常状態での安定運転時を基準に定められて
いる。その下限基準値と上限基準値との間は不感帯とし
て用いられる。そして、判断手段は発電出力検出値が下
限基準値を下回っているか、上限基準値を越えているか
否かを判断する。電力吸収放出切換え手段は、発電出力
検出値が下限基準値を下回っているときには発電出力系
統の発電出力が電力貯蔵手段に吸収貯蔵されるように判
断手段の制御に基づき切換えられる。また、電力吸収放
出切換え手段は、発電出力検出値が上限基準値を越えて
いるときには電力が電力貯蔵手段から交流発電出力系統
に向かって放出されるように判断手段の制御に基づき切
り換えられる。[Operation] According to the present invention, the power generation output detection means detects the power generation output of the alternating current generator that is directly connected to the prime mover and rotates. The determination means compares the power generation output detection value of the power generation output detection means with a lower limit reference value and an upper limit reference value. The lower limit reference value and the upper limit reference value are determined based on stable operation in a steady state in which the rated output of the prime mover is equal to the generated output of the alternator. The area between the lower limit reference value and the upper limit reference value is used as a dead zone. Then, the determining means determines whether the detected power generation output value is below the lower limit reference value or exceeds the upper limit reference value. The power absorption/discharge switching means is switched based on the control of the determination means so that the power generation output of the power generation output system is absorbed and stored in the power storage means when the detected power generation output value is below the lower limit reference value. Further, the power absorption/discharge switching means is switched based on the control of the determination means so that when the detected power generation output value exceeds the upper limit reference value, the power is discharged from the power storage means toward the AC power generation output system.
【０００８】[0008]
【実施例】図２において、１は原動機としての火力発電
用又は水力発電用のタービン、２はそのタービン１に直
結された交流発電機である。交流発電機２には３個の発
電出力端子３、４、５が設けられ、その発電出力端子３
、４、５には交流発電出力系統６が接続されている。
その交流発電出力系統６には公知のサイクロコンバータ
７を介して電力貯蔵手段８が接続されている。電力貯蔵
手段８は電力を回転運動エネルギーに変換して貯蔵する
機能を有し、図示を略す例えばフライホィール（高速電
力変換が可能なその他のバッテリー、超電導コイル等で
もよい）を備えている。DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 2, 1 is a turbine for thermal power generation or hydroelectric power generation as a prime mover, and 2 is an alternating current generator directly connected to the turbine 1. The AC generator 2 is provided with three power generation output terminals 3, 4, and 5, and the power generation output terminal 3
, 4, and 5 are connected to an AC power generation output system 6. A power storage means 8 is connected to the AC power generation output system 6 via a known cycloconverter 7. The power storage means 8 has a function of converting power into rotational kinetic energy and storing it, and includes, for example, a flywheel (not shown) (another battery capable of high-speed power conversion, a superconducting coil, etc. may also be used).
【０００９】サイクロコンバータ７は電力吸収放出切換
え手段として機能し、判断手段９によって制御される。
その判断手段９には上限基準値Ｅ１と下限基準値Ｅ２と
発電出力検出値Ｐ１とが入力される。上限基準値Ｅ１、
下限基準値Ｅ２は原動機１の定格出力と交流発電機２の
発電出力とが等しい定常状態での安定運転時の基準発電
出力Ｐ０（図３を参照）を基準に定められ、ΔＰは不感
帯である。上限基準値Ｅ１は交流発電機２の発電出力Ｐ
が原動機１の出力に対して所定値以上越える限界を定め
ており、下限基準値Ｅ２は交流発電機２の発電出力Ｐが
原動機１の出力に対して所定値以下に下回る限界を定め
ている。その発電出力検出値Ｐ１は発電出力検出手段１
０から出力され、発電出力検出手段１０は交流発電機２
に接続されている。The cycloconverter 7 functions as a power absorption/discharge switching means and is controlled by a determining means 9. The upper limit reference value E1, the lower limit reference value E2, and the detected power generation output value P1 are input to the determination means 9. Upper limit reference value E1,
The lower limit reference value E2 is determined based on the reference power generation output P0 (see Fig. 3) during stable operation in a steady state where the rated output of the prime mover 1 and the power generation output of the alternator 2 are equal, and ΔP is a dead zone. . The upper limit reference value E1 is the power generation output P of the AC generator 2
A lower limit reference value E2 defines a limit at which the power generation output P of the alternator 2 falls below a predetermined value with respect to the output of the prime mover 1. The power generation output detection value P1 is the power generation output detection means 1
0, and the power generation output detection means 10 is output from the AC generator 2.
It is connected to the.
【００１０】図１に示すように、交流発電機２の発電出
力が原動機としてのタービン１の出力よりも小さいとき
には、交流発電機２への入力エネルギーが過剰状態とな
るので、交流発電機２の回転数が増大する。つまり、交
流発電機２の発電出力Ｐが基準発電出力Ｐ０よりも小さ
いときには、交流発電機２の回転数Ｎが増大する。交流
発電機２の発電出力がタービン１の出力よりも大きいと
きには、交流発電機２の回転数Ｎが減少する。つまり、
交流発電機２の発電出力Ｐが基準発電出力Ｐ０よりも大
きいときは交流発電機２の回転数Ｎが減少する。判断手
段９は発電出力検出値Ｐ１が下限基準値Ｅ２を下回った
ときにはサイクロコンバータ７の出力周波数を、電力貯
蔵手段８のフライホィールと共に回転する例えば誘導機
の回転子周波数よりも高めて交流発電出力系統６の電力
が電力貯蔵装置８に吸収されるように切り換える。この
発電出力系統６からの電力供給により、電力貯蔵手段８
のフライホィールが加速され、電力貯蔵手段８に電力が
貯蔵される。一方、交流発電機２の回転数は電力貯蔵手
段８に向かってのエネルギーの放出により低下し、基準
回転数３６００に近づくことになる。また、判断手段９
は発電出力検出値Ｐ１が上限基準値Ｅ１を越えたときに
はサイクロコンバータ７の出力周波数を、電力貯蔵手段
８のフライホィールと共に回転する例えば誘導機の回転
子周波数よりも低めて貯蔵されている電力が交流発電出
力系統６に向かって放出されるように切り換える。この
電力貯蔵手段８からの電力の放出により、交流発電機２
の発電出力が減少し、回転が加速され、交流発電機２の
回転数が基準回転数３６００に近づくことになる。一方
、電力貯蔵手段８のフライホィール（図示を略す）はエ
ネルギーが放出されるので減速される。As shown in FIG. 1, when the power generation output of the alternator 2 is smaller than the output of the turbine 1 as a prime mover, the input energy to the alternator 2 becomes excessive, so that the output of the alternator 2 is reduced. Rotation speed increases. That is, when the power generation output P of the AC generator 2 is smaller than the reference power generation output P0, the rotation speed N of the AC generator 2 increases. When the power generation output of the alternator 2 is greater than the output of the turbine 1, the rotation speed N of the alternator 2 decreases. In other words,
When the power generation output P of the AC generator 2 is larger than the reference power generation output P0, the rotation speed N of the AC generator 2 decreases. When the power generation output detection value P1 is lower than the lower limit reference value E2, the determination means 9 increases the output frequency of the cycloconverter 7 higher than the rotor frequency of, for example, an induction machine that rotates together with the flywheel of the power storage means 8, and outputs AC power. Switching is performed so that the power of the grid 6 is absorbed into the power storage device 8. By supplying power from the power generation output system 6, the power storage means 8
The flywheel of is accelerated and electric power is stored in the electric power storage means 8. On the other hand, the rotational speed of the alternator 2 decreases due to the release of energy toward the power storage means 8, and approaches the reference rotational speed of 3600. In addition, the judgment means 9
When the power generation output detection value P1 exceeds the upper limit reference value E1, the output frequency of the cycloconverter 7 is lowered than the rotor frequency of, for example, an induction machine that rotates with the flywheel of the power storage means 8, and the stored power is reduced. It is switched so that it is discharged toward the AC power generation output system 6. This discharge of power from the power storage means 8 causes the alternator 2 to
The power generation output of the AC generator 2 decreases, the rotation is accelerated, and the rotational speed of the alternator 2 approaches the reference rotational speed of 3600. On the other hand, the flywheel (not shown) of the power storage means 8 is decelerated as energy is released.
【００１１】なお、Ｐ０は常にタービン１の出力に等し
く設定する。発電出力検出値Ｐ１が上限基準値Ｅ１と下
限基準値Ｅ２との間の不感帯ΔＰ内にあるときは、電力
の吸収放出は行われない。交流発電機２の回転数がほぼ
一定範囲内にあると考えられるからである。Note that P0 is always set equal to the output of the turbine 1. When the power generation output detection value P1 is within the dead zone ΔP between the upper limit reference value E1 and the lower limit reference value E2, no power is absorbed or released. This is because the rotational speed of the alternator 2 is considered to be within a substantially constant range.
【００１２】0012
【効果】本発明に係わる交流発電機の脱調防止装置は、
以上説明したように構成したので、交流発電機の回転数
が増大する傾向にあるときにはその回転数の増大を抑制
することができ、回転数が減少する傾向にあるときには
その回転数の減少を抑制することができることになって
、その交流発電機の脱調を防止することができるという
効果を奏する。[Effect] The AC generator step-out prevention device according to the present invention has the following effects:
With the configuration as explained above, when the rotational speed of the alternator tends to increase, the increase in rotational speed can be suppressed, and when the rotational speed tends to decrease, the decrease in rotational speed can be suppressed. This has the effect of preventing the alternator from losing synchronization.
【図１】交流発電機が脱調に至る経過で、交流発電機の
回転数と交流発電機の発電出力とタービンの出力との関
係を示す曲線図である。FIG. 1 is a curve diagram showing the relationship between the rotational speed of the alternator, the generated output of the alternator, and the output of the turbine as the alternator goes out of synchronization.
【図２】本発明に係わる交流発電機の脱調防止装置のブ
ロック回路図である。FIG. 2 is a block circuit diagram of an AC generator step-out prevention device according to the present invention.
【図３】本発明に係わる発電出力検出値と上限基準値と
下限基準値との関係を示すグラフである。FIG. 3 is a graph showing the relationship between a power generation output detection value, an upper limit reference value, and a lower limit reference value according to the present invention.
１…原動機
２…交流発電機
６…発電出力系統
７…サイクロコンバータ（電力放出吸収切換え手段）８
…電力貯蔵手段
Ｅ１…上限基準値
Ｅ２…下限基準値
Ｐ１…発電出力検出値1... Prime mover 2... AC generator 6... Power generation output system 7... Cyclo converter (power release/absorption switching means) 8
…Power storage means E1…Upper limit reference value E2…Lower limit reference value P1…Generation output detection value
Claims (1)
電機の発電出力系統に接続され該発電出力を検出する発
電出力検出手段と、該発電出力検出手段の発電出力検出
値と上限基準値と下限基準値とが入力され発電出力値が
基準範囲内にあるか否かを判断する判断手段と、前記発
電出力系統に電力吸収放出切換え手段を介して接続され
て前記発電出力の一部を貯蔵する電力貯蔵手段とを備え
、前記電力吸収放出切換え手段は前記発電出力が前記下
限基準値を下回ったときには前記発電出力系統の発電出
力が前記電力貯蔵手段に吸収されるように前記判断手段
によって切り換えられ、かつ、前記電力が前記上限基準
値を越えたときには電力が前記電力貯蔵手段から前記発
電出力系統に向かって放出されるように前記判断手段に
よって切り換えられることを特徴とする交流発電機の脱
調防止装置。1. A power generation output detection means that is connected to a power generation output system of an alternator that is directly connected to a prime mover to detect the power generation output, and a power generation output detection value of the power generation output detection means and an upper limit reference value. a lower limit reference value is inputted to determine whether the power generation output value is within the reference range; and a determination means connected to the power generation output system via a power absorption/discharge switching means to store a part of the power generation output. and a power storage means, wherein the power absorption/discharge switching means switches the power generation output of the power generation output system to be absorbed by the power storage means when the power generation output falls below the lower limit reference value. and when the electric power exceeds the upper limit reference value, the determining means switches the electric power so that the electric power is discharged from the electric power storage means toward the power generation output system. Prevention device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3052053A JPH04289733A (en) | 1991-03-18 | 1991-03-18 | Step-out preventing device for ac generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3052053A JPH04289733A (en) | 1991-03-18 | 1991-03-18 | Step-out preventing device for ac generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04289733A true JPH04289733A (en) | 1992-10-14 |
Family
ID=12904073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3052053A Pending JPH04289733A (en) | 1991-03-18 | 1991-03-18 | Step-out preventing device for ac generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04289733A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01107629A (en) * | 1987-10-20 | 1989-04-25 | Hitachi Ltd | Superconductive power storage apparatus |
-
1991
- 1991-03-18 JP JP3052053A patent/JPH04289733A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01107629A (en) * | 1987-10-20 | 1989-04-25 | Hitachi Ltd | Superconductive power storage apparatus |
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