JP2821722B2 - Method and apparatus for stabilizing power system - Google Patents
Method and apparatus for stabilizing power systemInfo
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- JP2821722B2 JP2821722B2 JP5028946A JP2894693A JP2821722B2 JP 2821722 B2 JP2821722 B2 JP 2821722B2 JP 5028946 A JP5028946 A JP 5028946A JP 2894693 A JP2894693 A JP 2894693A JP 2821722 B2 JP2821722 B2 JP 2821722B2
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- phase shift
- time
- power
- accident
- power system
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、電力系統安定度向上に
係り、特に移相変圧器の移相量制御を行う電力系統安定
化装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in power system stability, and more particularly to a power system stabilizing apparatus for controlling a phase shift amount of a phase shift transformer.
【０００２】[0002]
【従来の技術】従来の電力系統安定化装置においては、
系統事故時の位相制御を移相変圧器でおこない、その制
御は文献(連続形位相調整器による過渡安定度向上効果
の検討：平成４年電気学会全国大会：No.1088)に示され
ている様に、系統、故障種類及び故障除去時間が決まる
と移相変圧器の移相角の制御量及び制御終了時刻を予め
定める方式であった。このため前記の値は、系統諸条件
に応じて最適な値を求める必要があり、したがって、系
統条件が変わればその都度最適条件を求めなければなら
なかった。2. Description of the Related Art In a conventional power system stabilizer,
The phase control in the event of a system fault is performed by a phase shift transformer, and the control is shown in the literature (Examination of the transient stability improvement effect by a continuous phase adjuster: 1992 IEEJ National Convention: No. 1088) As described above, when the system, the type of fault, and the fault elimination time are determined, the control amount of the phase shift angle of the phase shift transformer and the control end time are determined in advance. For this reason, it is necessary to find the optimum value for the above-mentioned value in accordance with various system conditions. Therefore, the optimum condition must be obtained every time the system condition changes.
【０００３】[0003]
【発明が解決しようとする課題】本発明の目的は、系統
事故のとき、事故の種類、事故除去時間にかかわらず系
統の安定度向上を図る電力系統安定化方法及びその装置
を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a power system stabilization method and a power system stabilization method for improving the stability of a system in the event of a system failure regardless of the type of the accident and the time taken to eliminate the accident. is there.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に、電力系統に設定された検出点における有効電力の変
化に応じて、移相変圧器の移相量を制御して、電力系統
の位相を制御することにより系統を安定化する電力系統
安定化方法において、前記電力系統の事故時には、該事
故発生から予め設定された時間経過した後、前記移相変
圧器の移相量を設定された値とし、前記検出点におけ
る、有効電力の時間変化が増加し、かつ、無効電力の時
間変化が減少したときに、前記設定された移相量を零と
することを特徴とした電力系統安定化方法としたのであ
る。In order to achieve the above object, the amount of phase shift of a phase shift transformer is controlled in accordance with a change in active power at a detection point set in an electric power system. In a power system stabilization method for stabilizing a system by controlling a phase, when a fault occurs in the power system, after a predetermined time has elapsed from the occurrence of the fault, a phase shift amount of the phase shift transformer is set. Power system stability, characterized in that when the time change of the active power at the detection point increases and the time change of the reactive power decreases, the set phase shift amount is set to zero. It was a conversion method.
【０００５】また、電力系統に設定された検出点におけ
る電圧及び電流を検出する情報検出手段から有効電力及
び変動分を算出し、移相変圧器の移相量を制御すること
により系統を安定化する電力系統安定化装置において、
該変動分に応じた移相量を決定する移相制御手段と、前
記情報検出手段から有効電力及び無効電力の時間変化を
求め、有効電力の時間変化が増加し、かつ無効電力の時
間変化が減少する時刻を決定する時刻決定手段と、事故
発生から予め設定された時間経過した時刻から前記時刻
決定手段の出力までの間、予め設定された移相量を出力
する事故制御手段と、該事故制御手段の出力と前記移相
制御手段の出力を切換る切換手段を備えたことを特徴と
する電力系統安定化装置としたのである。さらに切換手
段を加算手段としてもよい。[0005] Further, the active power and the fluctuation are calculated from information detecting means for detecting the voltage and current at the detection points set in the power system, and the system is stabilized by controlling the phase shift amount of the phase shift transformer. Power system stabilizers
The phase shift control means for determining the phase shift amount according to the variation, and the time change of the active power and the reactive power are obtained from the information detecting means, the time change of the active power is increased, and the time change of the reactive power is Time determining means for determining a decreasing time; accident control means for outputting a predetermined phase shift amount from a time at which a predetermined time has elapsed since the occurrence of the accident to an output of the time determining means; The power system stabilizing device is provided with switching means for switching between the output of the control means and the output of the phase shift control means. Further, the switching means may be an adding means.
【０００６】[0006]
【作用】このように構成することにより、本発明によれ
ば次の作用により上記の目的が達成される。系統に事故
が発生したときは、系統の安定度を保つために通常時の
移相量制御を事故時の制御へ切換手段により切換える。
事故時の移相制御を開始する時間は事故が確実に除去さ
れた時点から始めるように、事故除去後一定の時間経過
してからとしているので事故除去時間に拘らず安定化制
御ができる。系統に与える移相量は、系統事故時の有効
電力を想定してある値に設定されているので如何なる事
故にも対処できる。この制御を終了する時刻は系統上に
定めた検出点の有効電力及び無効電力の時間に対する変
化量を算出し、有効電力の時間変化が増加し、かつ無効
電力の時間変化が減少する時刻とする。このように制御
することにより発電機の脱調はおこらない。これは数十
ケースのシミュレーションを行って解析的に得られた結
果である。この事故時の移相量の制御完了後は、切換手
段で再び通常の有効電力を用いた制御を行う。また、通
常時の移相量に、事故時の設定された移相量を加算手段
で加算しても同様な結果がえられる。According to the present invention, the above-mentioned object is achieved by the following operation according to the present invention. When an accident occurs in the system, the switching means switches the normal phase shift amount control to the control at the time of the accident in order to maintain the stability of the system.
The time to start the phase shift control at the time of the accident is set to be a certain time after the accident has been eliminated so that the stabilization control can be performed irrespective of the accident elimination time so as to start from the time when the accident is definitely eliminated. Since the amount of phase shift given to the grid is set to a certain value assuming active power at the time of a grid fault, any fault can be dealt with. The end time of this control is calculated by calculating the amount of change in the active power and the reactive power of the detection points determined on the system with respect to time, and the time at which the active power changes over time and the reactive power decreases over time. . With such control, the generator does not step out. This is a result obtained analytically by performing simulations of dozens of cases. After the control of the phase shift amount at the time of the accident is completed, the control using the normal active power is performed again by the switching means. Similar results can be obtained by adding the phase shift amount set at the time of the accident to the normal phase shift amount by the adding means.
【０００７】[0007]
【実施例】本発明の一実施例である電力系統安定化装置
において、移相変圧器の移相量制御ブロックを図１に、
移相変圧器が接続される系統構成の例を図２に示す。図
２において、発電機Ｇは、他の電源Ｍと外部リアクタン
スＸを有する線路で連携されている。この系統には移相
変圧器Ｔ、電流変成器ＣＴ、電圧変成器ＰＴが接続さ
れ、移相変圧器の二次励磁電圧Ｖｃ、移相量算出手段１
０を備えている。系統上のＦ点は事故点を示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a block diagram of a phase shift amount control block of a phase shift transformer in a power system stabilizing apparatus according to an embodiment of the present invention.
FIG. 2 shows an example of a system configuration to which the phase shift transformer is connected. In FIG. 2, the generator G is linked to another power source M by a line having an external reactance X. The phase shift transformer T, the current transformer CT, and the voltage transformer PT are connected to this system, and the secondary excitation voltage Vc of the phase shift transformer, the phase shift amount calculating means 1
0 is provided. Point F on the system indicates an accident point.
【０００８】図１において、入力信号ｔで示す事故制御
手段１１は、時刻ｔ1からｔ2までの間、予め与えられた
移相量φ01を与えるものであって、切換手段１５により
移相量φ01を時刻ｔ1から時刻ｔ2の間だけ、上下限のリ
ミッタＳＡＴＵ、ＳＡＴＤ及び時間遅れＴ9を介して移
相量φを出力し、これに基づき移相変圧器Ｔの二次励磁
電圧Ｖｃの位相を制御する。ここで、移相量φ01を投入
する時刻ｔ1は、事故除去時刻から一定時間経過後の時
刻とするが、これは、最過酷の事故を想定し、事故検出
時間及び遮断器の動作時間等事故除去の為に要する最大
時間を考慮して予め定めておく。次に、移相量φ01を零
とする時刻ｔ2は、時刻決定手段１２により決定され
る。設定された検出点の有効電力Ｐ及び無効電力Ｑの時
間変化を求め、有効電力Ｐ及び無効電力Ｑの時間変化分
が、ΔＰ／Δｔ＞０であり、ΔＱ／Δｔ＜０である関係
を満足した時刻とする。In FIG. 1, an accident control means 11 indicated by an input signal t gives a predetermined phase shift amount φ 01 from time t 1 to time t 2. The phase shift amount φ is output from the amount φ 01 through the upper and lower limiters SATU and SATD and the time delay T 9 only from the time t 1 to the time t 2 , and based on this, the secondary excitation of the phase shift transformer T is performed. The phase of the voltage Vc is controlled. Here, the time t 1 at which the phase shift amount φ 01 is input is a time after a lapse of a fixed time from the accident removal time, which is assumed to be the severest accident, the accident detection time and the operation time of the circuit breaker. It is determined in advance in consideration of the maximum time required for removing an accident. Next, the time t 2 at which the phase shift amount φ 01 is made zero is determined by the time determining means 12. The time change of the active power P and the reactive power Q at the set detection point is obtained, and the time change of the active power P and the reactive power Q is ΔP / Δt> 0 and satisfies the relationship of ΔQ / Δt <0. Time.
【０００９】入力信号Ｐlineで示される移相制御手段１
３、１４は、設定された検出点の有効電力から、時間遅
れＴ1、Ｔ2を介した出力の差により、検出点の有効電力
の変動分を求め、この出力に時定数Ｔ3、Ｔ4、Ｔ5、Ｔ6
からなる進み遅れ回路により位相補償を施して、切換手
段１５を経て上下限のリミッタＳＡＴＵ、ＳＡＴＤ、時
間遅れＴ9を介して、ある移相量を出力し、移相変圧器
Ｔの二次励磁電圧Ｖｃの位相を制御する。事故発生の場
合、切換手段１５により上述した事故制御手段１１の信
号が入力される。Phase shift control means 1 indicated by input signal Pline
3,14 from active power detector points set by the difference between the output through a time delay T 1, T 2, obtains the variation of the detection points active power, the time constant T 3 to this output, T 4, T 5, T 6
Subjected to phase compensation by comprising lead-lag circuit from the upper and lower limit of the limiter SATU via switching means 15, SATD, via a delay T 9 times, and outputs a certain amount of phase shift, the secondary excitation of the phase transformer T The phase of the voltage Vc is controlled. In the event of an accident, the signal from the accident control means 11 is input by the switching means 15.
【００１０】前記した時刻ｔ2以後は、再び移相制御手
段１３、１４により前記検出点の有効電力を用いて移相
の制御を行う。これらの演算処理は、図２の移相変圧器
の移相量算出手段１０で行う。After the time t 2 , the phase shift is controlled again by the phase shift control means 13 and 14 using the active power at the detection point. These calculation processes are performed by the phase shift amount calculating means 10 of the phase shift transformer of FIG.
【００１１】このようにすることにより、事故時におい
ても最適の潮流状態で系統を運用できるため、系統の供
給信頼度は大幅に向上する。In this way, even in the event of an accident, the system can be operated in an optimal power flow state, so that the supply reliability of the system is greatly improved.
【００１２】前記Ｆ点において事故が発生した場合に、
移相変圧器により位相制御しないときは、図３に示すよ
うに、事故除去時刻ｔFで事故が除去されても、発電機
Ｇは脱調する。これに対し、移相変圧器Ｔの二次側を励
磁電圧Ｖｃで励磁し、事故除去時間ｔFで事故が除去さ
れたのち設定された時間経過したあと、励磁電圧Ｖｃの
移相量を設定された値に制御し、系統上に設定された検
出点における有効電力と無効電力の情報を用いて、有効
電力及び無効電力の時間変化分が共に上述した条件を満
足したときに制御を終了したときの、事故状況と発電機
位相角、有効電力、無効電力、移相変圧器制御の関係を
図４に示した。発電機Ｇは脱調することなく安定して運
転している。When an accident occurs at the point F,
When not phase-controlled by phase-shifting transformer, as shown in FIG. 3, even if an accident is removed in an accident removal time t F, the generator G is step-out. On the other hand, the secondary side of the phase shift transformer T is excited by the excitation voltage Vc, and after the fault is eliminated at the fault elimination time t F , the set amount of phase shift of the excitation voltage Vc is set. Control, and using the information of the active power and the reactive power at the detection points set on the system, the control is terminated when both the time changes of the active power and the reactive power satisfy the above-described conditions. FIG. 4 shows the relationship between the accident situation and the generator phase angle, active power, reactive power, and phase shift transformer control. The generator G is operating stably without step-out.
【００１３】図５は、上記と同様に、移相変圧器Ｔの二
次側を励磁電圧Ｖｃで励磁し、事故除去時刻ｔFで事故
が除去されたのち一定時間経過したあと、励磁電圧Ｖｃ
の位相角を予め定めた値に制御する場合である。この場
合は、検出点の有効電力及び無効電力の時間変化分の少
なくてもどちらか一方が条件を満たしていない時点で制
御を終了した場合であって、発電機Ｇは脱調する。FIG. 5 shows that the secondary side of the phase-shifting transformer T is excited with the excitation voltage Vc, and after the accident is eliminated at the accident elimination time t F , a predetermined time elapses.
Is controlled to a predetermined value. In this case, the control is terminated when at least one of the active power and the reactive power at the detection point does not satisfy the condition at least, and the generator G steps out.
【００１４】また、図６に示すように、切換手段１５に
代えて加算手段１６を設けて、時刻ｔ1と時刻ｔ2の間
は、事故制御手段１１の出力を加算する方式でもよい。
この場合、移相量は上述した切換手段１５を設けた場合
に相当する量を移相量算出手段１０で算出してもよい。As shown in FIG. 6, an adder 16 may be provided in place of the switch 15 to add the output of the accident controller 11 between time t 1 and time t 2 .
In this case, the phase shift amount may be calculated by the phase shift amount calculation unit 10 in an amount corresponding to the case where the above-described switching unit 15 is provided.
【００１５】[0015]
【発明の効果】本発明によれば、系統の事故時、検出点
の電圧・電流情報を用いて、移相変圧器の移相量制御終
了時刻を決定するので、系統構成が変化しても電力系統
の最適制御を行なうことができるため、電力の供給信頼
度は大幅に向上する。According to the present invention, when a system fault occurs, the phase shift control end time of the phase shift transformer is determined using the voltage / current information at the detection point, so that even if the system configuration changes. Since the optimal control of the power system can be performed, the power supply reliability is greatly improved.
【図１】本発明の一実施例である移相変圧器の移相量制
御ブロックを示す図である。FIG. 1 is a diagram showing a phase shift amount control block of a phase shift transformer according to one embodiment of the present invention.
【図２】本発明の一実施例を含む系統構成例を示す図で
ある。FIG. 2 is a diagram showing an example of a system configuration including an embodiment of the present invention.
【図３】系統事故と発電機の位相角変化を示す図であ
る。FIG. 3 is a diagram showing a system fault and a change in phase angle of a generator.
【図４】本発明の一実施例による発電機の位相角変化を
示す図である。FIG. 4 is a diagram showing a phase angle change of the generator according to one embodiment of the present invention.
【図５】従来の制御方式による発電機の位相角変化を示
す図である。FIG. 5 is a diagram showing a phase angle change of a generator according to a conventional control method.
【図６】本発明の他の実施例である移相変圧器の移相量
制御ブロックを示す図である。FIG. 6 is a diagram showing a phase shift amount control block of a phase shift transformer according to another embodiment of the present invention.
１０ 移相量算出手段 １１ 事故制御手段 １２ 時刻決定手段 １３、１４ 移相制御手段 １５ 切換手段 １６ 加算手段 Ｇ 発電機 Ｍ 他の電源 Ｔ 移相変圧器 Ｘ 線路リアクタンス Ｖｃ 移相変圧器の二次励磁電圧 ＣＴ 電流変成器 ＰＴ 電圧変成器 Ｆ 事故点 Reference Signs List 10 phase shift amount calculation means 11 accident control means 12 time determination means 13, 14 phase shift control means 15 switching means 16 addition means G generator M other power supply T phase shift transformer X line reactance Vc secondary of phase shift transformer Excitation voltage CT Current transformer PT Voltage transformer F Fault point
フロントページの続き (72)発明者 高浜 朗 茨城県日立市国分町一丁目１番１号 株 式会社 日立製作所 国分工場内 (72)発明者 野原 哈夫 茨城県日立市国分町一丁目１番１号 株 式会社 日立製作所 国分工場内 (72)発明者 後藤 益雄 茨城県日立市国分町一丁目１番１号 株 式会社 日立製作所 国分工場内 (56)参考文献 特開 昭51−80942（ＪＰ，Ａ) 特開 昭55−88529（ＪＰ，Ａ) 特開 昭62−110441（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) H02J 3/00 - 5/00Continued on the front page (72) Inventor Akira Takahama 1-1-1, Kokubuncho, Hitachi City, Ibaraki Pref. Hitachi, Ltd. Kokubu Plant (72) Inventor Haruo Nohara 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1 Kokubu Plant, Hitachi, Ltd. (72) Inventor Masuo Goto 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside Kokubu Plant, Hitachi, Ltd. (56) References JP-A-51-80942 (JP, A) JP-A-55-88529 (JP, A) JP-A-62-110441 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) H02J 3/00-5/00
Claims (3)
効電力の変化に応じて、移相変圧器の移相量を制御し
て、電力系統の位相を制御することにより系統を安定化
する電力系統安定化方法において、前記電力系統の事故
時には、該事故発生から予め設定された時間経過した
後、前記移相変圧器の移相量を設定された値とし、前記
検出点における、有効電力の時間変化が増加し、かつ、
無効電力の時間変化が減少したときに、前記設定された
移相量を零とすることを特徴とした電力系統安定化方
法。An electric power for stabilizing a system by controlling a phase shift amount of a phase shift transformer in accordance with a change in active power at a detection point set in the power system and controlling a phase of the power system. In the power system stabilization method, at the time of a fault in the power system, after a predetermined time has elapsed from the occurrence of the fault, the phase shift amount of the phase shift transformer is set to a set value, and the active power at the detection point is detected. Time change increases, and
A method for stabilizing a power system, wherein the set phase shift amount is set to zero when the time change of the reactive power decreases.
圧及び電流を検出する情報検出手段から有効電力及び変
動分を算出し、移相変圧器の移相量を制御することによ
り系統を安定化する電力系統安定化装置において、該変
動分に応じた移相量を決定する移相制御手段と、前記情
報検出手段から有効電力及び無効電力の時間変化を求
め、有効電力の時間変化が増加し、かつ無効電力の時間
変化が減少する時刻を決定する時刻決定手段と、事故発
生から予め設定された時間経過した時刻から前記時刻決
定手段の出力までの間、予め設定された移相量を出力す
る事故制御手段と、該事故制御手段の出力と前記移相制
御手段の出力を切換る切換手段を備えたことを特徴とす
る電力系統安定化装置。2. An information detecting means for detecting a voltage and a current at a detection point set in a power system, calculates an active power and a variation, and controls a phase shift amount of a phase shift transformer to stabilize the system. In the power system stabilizing device, a phase change control means for determining a phase shift amount according to the variation, and a time change of the active power and the reactive power are obtained from the information detection means, and the time change of the active power increases. And a time determining means for determining a time at which the time change of the reactive power decreases, and outputting a predetermined phase shift amount from a time when a predetermined time has elapsed since the occurrence of the accident to an output of the time determining means. An electric power system stabilizing device, comprising: an accident control unit that performs an operation, and a switching unit that switches an output of the accident control unit and an output of the phase shift control unit.
圧及び電流を検出する情報検出手段から有効電力及び変
動分を算出し、移相変圧器の移相量を制御することによ
り系統を安定化する電力系統安定化装置において、該変
動分に応じた移相量を決定する移相制御手段と、前記情
報検出手段から有効電力及び無効電力の時間変化を求
め、有効電力の時間変化が増加し、かつ無効電力の時間
変化が減少する時刻を決定する時刻決定手段と、事故発
生から予め設定された時間経過した時刻から前記時刻決
定手段の出力までの間、予め設定された移相量を出力す
る事故制御手段と、該事故制御手段の出力と前記移相制
御手段の出力を加算する加算手段を備えたことを特徴と
する電力系統安定化装置。3. The system is stabilized by calculating active power and fluctuation from information detecting means for detecting voltage and current at a detection point set in the power system and controlling the amount of phase shift of the phase shift transformer. In the power system stabilizing device, a phase change control means for determining a phase shift amount according to the variation, and a time change of the active power and the reactive power are obtained from the information detection means, and the time change of the active power increases. And a time determining means for determining a time at which the time change of the reactive power decreases, and outputting a predetermined phase shift amount from a time when a predetermined time has elapsed since the occurrence of the accident to an output of the time determining means. An electric power system stabilizing device comprising: an accident control unit that performs an operation; and an adding unit that adds an output of the accident control unit and an output of the phase shift control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5028946A JP2821722B2 (en) | 1993-02-18 | 1993-02-18 | Method and apparatus for stabilizing power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5028946A JP2821722B2 (en) | 1993-02-18 | 1993-02-18 | Method and apparatus for stabilizing power system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06245385A JPH06245385A (en) | 1994-09-02 |
| JP2821722B2 true JP2821722B2 (en) | 1998-11-05 |
Family
ID=12262578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5028946A Expired - Fee Related JP2821722B2 (en) | 1993-02-18 | 1993-02-18 | Method and apparatus for stabilizing power system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2821722B2 (en) |
-
1993
- 1993-02-18 JP JP5028946A patent/JP2821722B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06245385A (en) | 1994-09-02 |
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