JPH0714258B2 - Step-out detection device - Google Patents
Step-out detection deviceInfo
- Publication number
- JPH0714258B2 JPH0714258B2 JP60227029A JP22702985A JPH0714258B2 JP H0714258 B2 JPH0714258 B2 JP H0714258B2 JP 60227029 A JP60227029 A JP 60227029A JP 22702985 A JP22702985 A JP 22702985A JP H0714258 B2 JPH0714258 B2 JP H0714258B2
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- phase angle
- angle difference
- voltage
- voltage phase
- predicted
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Description
【発明の詳細な説明】 ［発明の技術分野］ 本発明は、電力系統の脱調を事前に予測判定し得るよう
にした脱調検出装置に関するものである。Description: TECHNICAL FIELD The present invention relates to a step-out detection device capable of predicting and determining a step-out of a power system in advance.
［発明の技術的背景とその問題点］ 従来から、系統事故による脱調現象を防止する手段とし
て、複数の電気所間の電圧位相を比較しあい、その互い
の位相角差が電気角で例えば180度以上になったことを
検出して系統脱調と判定し、夫々の電気所のしゃ断器を
開放する脱調分離リレーがある。しかしかかる手段で
は、脱調検出が遅れるために脱調現象が他に波及してし
まう恐れがある。[Technical Background of the Invention and Problems Thereof] Conventionally, as a means for preventing a step-out phenomenon due to a system fault, voltage phases of a plurality of electric stations are compared with each other, and the phase angle difference between them is, for example, 180 electrical degrees. There is a step-out separation relay that detects that the frequency has exceeded the limit and judges that the system is out of step, and opens the circuit breaker of each electric station. However, with such means, there is a possibility that the out-of-step phenomenon may spread to other parts because the out-of-step detection is delayed.
そこで、系統の脱調を事前に予測判定する、即ち脱調を
検出するのではなく脱調を事前に予測判定することがで
きれば、この条件により種々の系統安定化制御を行なっ
て系統脱調を事前に防止することが可能となるが、電気
所間の電圧位相角差を検出して系統脱調を早期に予測判
定するような手段は、現在のところまだ実現していな
い。Therefore, if system out-of-step is predicted and determined in advance, that is, if out-of-step can be predicted and determined instead of detecting out-of-step, various system stabilization control is performed under these conditions to perform system out-of-step. Although it is possible to prevent it in advance, a means for detecting the voltage phase angle difference between the electric stations and predicting and determining the system out-of-step at an early stage has not yet been realized at present.
［発明の目的］ 本発明は上記のような事情を考慮して成されたもので、
その目的は電力系統が脱調に至ることを早期に予測判定
して系統脱調を事前に防止することが可能な脱調検出装
置を提供することにある。[Object of the Invention] The present invention has been made in consideration of the above circumstances.
It is an object of the present invention to provide a step-out detection device capable of preventing and preliminarily preventing a step-out of the power system by predicting and determining early that the power system will go out of step.
［発明の概要］ 上記の目的を達成するために本発明では、複数の電気所
から構成される電力系統の脱調を予測判定する装置にお
いて、各電気所の電圧をそれぞれ検出する複数の電圧検
出器と、伝送系を介してそれぞれ伝送される各電圧検出
器からの各電圧を入力して両者の電圧位相角差を定周期
で検出し、現時点を含めて３点の当該電圧位相角差を基
に将来時点の電圧位相角差を予測演算し、かつこの予測
電圧位相角差の変化傾向が発散方向でしかもその値が所
定値を越えたことにより脱調と判定する脱調判定器とを
備えて構成している。[Summary of the Invention] In order to achieve the above object, according to the present invention, in a device for predicting and determining a step-out of a power system including a plurality of electric stations, a plurality of voltage detectors for detecting the voltages of the respective electric stations, respectively. And the voltage from each voltage detector transmitted through the transmission system are input to detect the voltage phase angle difference between the two in a fixed cycle, and the voltage phase angle difference at three points including the current time is detected. Based on this, a step-out determination device that predicts and calculates the voltage phase angle difference at a future point in time, and determines that the step-out condition is out of step because the change tendency of the predicted voltage phase angle difference is in the diverging direction and the value exceeds a predetermined value. Prepared and configured.
［発明の実施例］ まず、本発明による脱調予測の考え方について説明す
る。Embodiment of the Invention First, the concept of step-out prediction according to the present invention will be described.
第４図は、電力系統の一例を示すものである。同図にお
いて、１および２は複数の発電機群からなる大電源系統
を示し、３はこれら大電源系統1,2を結ぶ送電系統を示
す。FIG. 4 shows an example of a power system. In the figure, 1 and 2 indicate a large power supply system including a plurality of generator groups, and 3 indicates a power transmission system connecting these large power supply systems 1 and 2.
次に第５図（ａ）〜（ｃ）および（ｄ）は、系統事故な
どが原因となって上記第４図における系統１と系統２が
脱調に至る様相の概略を、各系統１〜３の電圧ベクトル
の動きおよび両者の電圧の位相角差の動きで示したもの
である。Next, FIGS. 5 (a) to 5 (c) and 5 (d) show an outline of the manner in which the system 1 and the system 2 in FIG. This is shown by the movement of the voltage vector of No. 3 and the movement of the phase angle difference between the two voltages.
図において、Aは系統１の代表的な電気所の母線電圧
で、系統１のその他の各電気所の母線電圧とほぼ同一の
動きをするものと仮定する。一方、Bは系統２の代表
的な電気所の母線電圧で、系統２のその他の電気所の母
線電圧とほぼ同一の動きをするものと仮定する。ここ
で、同一の動きとは系統事故その他の擾乱に対する同一
系統内の各発電機の動き、即ち加速，減速がほとんど同
じということである。すなわち、母線電圧VA,VBは系統
1,2のそれぞれ全体の電源の動きを示しているものとす
る。In the figure, A is the bus voltage of a typical electric station of system 1, and it is assumed that the bus voltage of each of the other electric stations of system 1 behaves almost the same. On the other hand, B is assumed to be the bus voltage of a representative electric power station of grid 2 and behaves almost the same as the bus voltage of other electric power stations of grid 2. Here, the same movement means that the movement of each generator in the same system with respect to a system accident or other disturbances, that is, acceleration and deceleration are almost the same. That is, the bus voltage V A , V B
It is assumed that each of the power supply movements of 1 and 2 is shown.
ここで、第５図（ａ）は通常の状態を示し、系統１と系
統２はある位相角差θａで連系されて運転している。次
に第５図（ｂ）は、系統擾乱などによって系統１と系統
２の各発電機の動きが異なり、徐々に位相角差が拡大し
て行く様子を示す。そして第５図（ｃ）は、位相角差が
増々拡大してその角度が電気角で180度になった場合を
示す。この様な状態となれば系統１と系統２は同期を失
い脱調となる。更に第５図（ｄ）は、この様な系統１と
系統２との位相角差の拡大傾向の時間的変化を示したも
のであり、例えば過渡第一波脱調の場合はその傾向が単
調発散となる。Here, FIG. 5 (a) shows a normal state, in which the system 1 and the system 2 are interconnected with a certain phase angle difference θa. Next, FIG. 5 (b) shows a state in which the generators of system 1 and system 2 move differently due to system disturbance and the phase angle difference gradually increases. Then, FIG. 5 (c) shows a case where the phase angle difference is increased more and more and the electrical angle becomes 180 degrees. In such a state, the system 1 and the system 2 lose synchronization and become out of sync. Further, FIG. 5 (d) shows such a temporal change in the increasing tendency of the phase angle difference between the system 1 and the system 2. For example, in the case of transient first wave step-out, the tendency is monotonous. It becomes divergent.
この様に、大きな２つの電源系統が連系されて運転して
いる場合、各電源系の代表的な電気所の母線電圧間の電
圧位相角差の変化を観測すれば脱調現象をとらえること
ができる。In this way, when two large power supply systems are connected and operating, the step-out phenomenon can be detected by observing the change in the voltage phase angle difference between the bus voltage of the representative electric station of each power supply system. You can
次に、定周期で検出した過去数点の２つの電源系統間の
電圧位相角差より、将来時点の電圧位相角差を予測演算
する方法について述べる。一般に、保護継電器による事
故送電線のしゃ断以降は、系統１と系統２の電圧位相角
差は、それぞれの発電機群の大きな慣性により不連続に
変化することはなく滑らかに変化する。それゆえ、過去
数点の系統１と系統２との電圧位相角差を通る高次式を
求め、その延長上の点として将来の電圧位相角差を求め
ることができる。Next, a method of predicting and calculating a voltage phase angle difference at a future time point based on the voltage phase angle differences between the two power supply systems at the past several points detected in a fixed cycle will be described. Generally, after the accidental transmission line is cut off by the protective relay, the voltage phase angle difference between the grid 1 and grid 2 does not change discontinuously due to the large inertia of the respective generator groups, but changes smoothly. Therefore, it is possible to obtain a higher-order expression that passes through the voltage phase angle differences between the system 1 and the system 2 at the past several points, and obtain the future voltage phase angle difference as a point on the extension thereof.
以下、２次式で予測する場合について第６図を用いて説
明する。いま、ΔＴ間隔で検出した系統１と系統２との
電圧位相角差をθ(tK)，θ(tK-1)，θ(tK-2)とすると、
この３点を通る曲線は（１）式，（２）式で定義され
る。Hereinafter, a case of predicting with a quadratic equation will be described with reference to FIG. Now, if the voltage phase angle differences between system 1 and system 2 detected at ΔT intervals are θ (t K ), θ (t K-1 ), θ (t K-2 ),
A curve that passes through these three points is defined by equations (1) and (2).
θ（ｔ）＝θ(tK-2)＋Δθ12(t-tK-1)＋ΔθO12(t-
tK-1)(t-tK-2) …（１） Δθ12＝（θ(tK-1)−θ(tK-2)）／ΔＴ ΔθO1＝（θ(tK)−θ(tK-1)）／ΔＴ …（２） ΔθO12＝（Δθ12−ΔθO1）/2ΔＴ ここで、tKは現時間、tK-1はΔＴ前の時間、tK-2は２Δ
Ｔ前の時間をそれぞれ示す。そして、将来時点τにおけ
る電圧位相角差は、（１）式のｔにてτを代入すること
により演算される。θ (t) = θ (t K-2 ) + Δθ 12 (tt K-1 ) + Δθ O12 (t-
t K-1 ) (tt K-2 ) ... (1) Δθ 12 = (θ (t K-1 ) −θ (t K-2 )) / ΔT Δθ O1 = (θ (t K ) −θ (t K-1 )) / ΔT (2) Δθ O12 = (Δθ 12 −Δθ O1 ) / 2ΔT where t K is the current time, t K-1 is the time before ΔT, and t K-2 is 2Δ.
Times before T are shown respectively. Then, the voltage phase angle difference at the future time point τ is calculated by substituting τ at t in the equation (1).
次に、脱調の判定方法について同様に第６図を用いて説
明する。脱調判定は、上記（１），（２）式で演算した
将来時点の系統１と系統２との電圧位相角差が発散傾向
を示し、かつ予め設定した境界値を越えたか否かにより
行なう。すなわち、将来時点τ1＜τ2＜…＜τPにおけ
る電圧位相角差が、 θ（τ1）＜θ（τ2）＜…＜θ（τP） …（３） かつθ（τP）＞θlimit …（４） の場合に脱調と判定する。ここで、θlimitは脱調判定
のための境界値であり、電力系統の構成、潮流状態によ
って多少の変化はあるが、電気角で概ね180度程度であ
る。この脱調判定方法は、系統１と系統２が例えば第一
波で脱調する場合、両者の電圧位相角差が単調に発散し
かつある境界値を越えるという物理的性質を利用してい
る。また、上記において、τ1からτP間の時間幅として
は、次のように考慮することができる。このτ1からτP
間の時間幅は、適用対象とする電力系統における系統動
揺の振動周期に基づいて決められるものである。Next, a method of determining out-of-step will be described with reference to FIG. The out-of-step determination is performed based on whether or not the voltage phase angle difference between the system 1 and the system 2 at the future time calculated by the above equations (1) and (2) shows a diverging tendency and exceeds the preset boundary value. . That is, the voltage phase angle difference at a future time point τ 1 <τ 2 <... <τ P is θ (τ 1 ) <θ (τ 2 ) <... <θ (τ P ) ... (3) and θ (τ P ). > Θ limit (4), step out is determined. Here, θlimit is a boundary value for the step-out determination, and is approximately 180 degrees in electrical angle, although it may vary depending on the configuration of the power system and the power flow state. This step-out determination method uses the physical property that the voltage phase angle difference between the system 1 and the system 2 monotonously diverges and exceeds a certain boundary value when the system 1 and the system 2 are out-of-step, for example. Further, in the above, the time width between τ 1 and τ P can be considered as follows. From τ 1 to τ P
The time interval between is determined based on the oscillation period of the system oscillation in the power system to which it is applied.
すなわち、系統動揺は、正弦波つまりsin関数に近いた
め、（１）式に示す２次関数を用いて推定できる時間幅
は、概ね現時点から1/4周期先までである。換言する
と、t1からτPまでは1/4周期以下にする必要がある。通
常、系統動揺の振動周期は１秒程度なので、推定可能な
時間幅は、250msec程度となる。そして、電力系統の安
定判定を行なうための条件として、その将来時点の動揺
傾向が発散方向でθlimitを越えていることを確認した
いことから、予測の最終時点の値θ（τP）を含めて少
なくとも２点以上の将来時点の予測値が必要である。That is, since the system sway is close to a sine wave, that is, a sin function, the time width that can be estimated using the quadratic function shown in the equation (1) is approximately 1/4 period ahead from the present time. In other words, from t 1 to τ P must be 1/4 period or less. Normally, the vibration period of system sway is about 1 second, so the time width that can be estimated is about 250 msec. Then, as a condition for performing stable determination of the power system, since you want to make sure that upset trend that future time exceeds the θlimit divergent directions, including the value of the final point of the predicted θ (τ P) At least 2 or more future forecast values are required.
一方、τPとτP-1の時間間隔は、電圧位相角差の検出間
隔ΔＴ（20msec程度）と同等としたいことから、例えば
将来の予測点数を５点程度とすれば、τ1からτP間の時
間幅は、概ね100msec程度となる。On the other hand, since it is desired to make the time interval between τ P and τ P-1 equal to the voltage phase angle difference detection interval ΔT (about 20 msec), for example, if the future predicted score is about 5, then τ 1 to τ The time width between P is about 100 msec.
以下、上記の考え方に基づく本発明の一実施例について
図面を参照して説明する。第１図は、本発明による脱調
検出装置の構成例を示すものである。図において、11a,
11bはそれぞれ系統１と系統２の代表的な電気所、12a,1
2bはそれぞれの電気所11a,11bの母線電圧をΔｔ間隔で
検出する電圧検出器である。また13a,13bは、上記電圧
検出器12a,12bで検出した電気所11a,11bの母線電圧を脱
調判定器14にそれぞれ伝送するための伝送系である。さ
らに、脱調判定器14は上記伝送系13a,13bを介して伝送
される夫々の電圧の位相角差θを定周期ΔＴで検出し、
現時点を含めて３点の値より将来の電圧位相角差を予測
演算し、かつその値および変化の傾向つまり前記
（３），（４）式により脱調を予測判定するものであ
る。An embodiment of the present invention based on the above concept will be described below with reference to the drawings. FIG. 1 shows a configuration example of a step-out detection device according to the present invention. In the figure, 11a,
11b are representative electric power stations of system 1 and system 2, 12a, 1
Reference numeral 2b is a voltage detector that detects the bus voltage of each of the electric stations 11a and 11b at Δt intervals. Further, 13a and 13b are transmission systems for transmitting the bus bar voltages of the electric stations 11a and 11b detected by the voltage detectors 12a and 12b to the out-of-step judging device 14, respectively. Further, the step-out judging device 14 detects the phase angle difference θ between the voltages transmitted through the transmission systems 13a and 13b at a constant period ΔT,
The voltage phase angle difference in the future is predicted and calculated from the values of three points including the present time, and the value and the tendency of change, that is, the out-of-step is predicted and determined by the expressions (3) and (4).
次に、かかる構成の作用について具体的に述べる。いま
第１図において、送電線故障などに系統擾乱が発生して
図示しない保護継電器により故障が除去されると、電圧
検出器12a,12bは系統１と系統２の代表的な電気所11a,1
1bの母線電圧をΔｔ間隔で検出し、これらの電圧が夫々
伝送系13a,13bを介して脱調判定器14に伝送される。こ
れにより、脱調判定器14は第２図に示す様に、系統１と
系統２の代表的な電気所11a,11bの母線電圧が零電位を
切る時間差Δξより、両者の電圧位相角差θを次式より
ΔＴ間隔で演算する。Next, the operation of this configuration will be specifically described. In FIG. 1, when a system disturbance occurs due to a transmission line failure or the like and the failure is removed by a protective relay (not shown), the voltage detectors 12a and 12b are connected to the representative electric stations 11a and 1 of the system 1 and the system 2, respectively.
The bus voltage of 1b is detected at intervals of Δt, and these voltages are transmitted to the out-of-step judging device 14 via the transmission systems 13a and 13b, respectively. As a result, as shown in FIG. 2, the step-out determination unit 14 determines the voltage phase angle difference θ between the bus lines of the representative electric power stations 11a and 11b of the system 1 and the system 2 from the time difference Δξ when the potentials are zero. Is calculated at intervals of ΔT from the following equation.
θ＝360××Δξ …（５） ここで、は系統の基本周波数である。また、ΔＴは1/
2あるいは1/であり、例えばが50（Hz）系統では1
0msecあるいは20msecとなる。θ = 360 ×× Δξ (5) where is the fundamental frequency of the system. Also, ΔT is 1 /
2 or 1 /, for example, 1 for 50 (Hz) system
It becomes 0msec or 20msec.
次に脱調判定器14は、現時点tK，ΔＴ時間前tK-1,2ΔＴ
時間前tK-2の３時点に夫々検出した電圧位相角差θ
(tK)，θ(tK-1)，θ(tK-2)より、前記（１），（２）式
を用いて将来時点τ1，τ2，…τPにおける電位位相角
差を予測演算する。そしてさらに、その予測値が前記
（３），（４）式を満足したならば脱調と判定し、図示
しない系統安定化装置に制御指令を与えることにより、
系統脱調を事前に防止することができる。なお第３図
は、上述した脱調判定器14の作用をフローチャートで示
したものである。Next, the out-of-step judging device 14 determines that the current time t K , ΔT time before t K− 1,2ΔT
Voltage phase angle difference θ detected at 3 points of time before t K-2
From (t K ), θ (t K-1 ), and θ (t K-2 ), the potential phase angle difference at future time points τ 1 , τ 2 , ... τ P using the above equations (1) and (2). To calculate. Further, if the predicted value satisfies the expressions (3) and (4), it is determined that the step is out of step, and a control command is given to a system stabilizing device (not shown),
System outage can be prevented in advance. Note that FIG. 3 is a flow chart showing the operation of the above-mentioned step out judging device 14.
上述したように本脱調検出装置は、複数の電気所11a,11
bから構成される電力系統における各電気所11a,11bの母
線電圧をΔｔ間隔で夫々検出する複数の電圧検出器12a,
12bと、伝送系13a,13bを介して夫々伝送される上記各電
圧検出器12a,12bからの各電圧を入力して両者の電圧位
相角差θを定周期ΔＴにて検出し、現時点を含めて３点
の当該電圧位相角差θ(tK)，θ(tK-1)，θ(tK-2)を基に
将来時点τ1，τ2，τPの電圧位相角差θ（τ1），θ
（τ2），θ（τP）を予測演算し、かつこの予測電圧位
相角差θ（τ1），θ（τ2），・・・，θ（τP）の変
化傾向がθ（τ1）＜θ（τ2）＜θ（τP）なる発散傾
向でしかもその値が所定値を越えた［θ（τP）＞θlim
it］ことにより脱調と判定する脱調判定器14とから構成
したものである。As described above, the out-of-step detecting device is provided with a plurality of electric stations 11a, 11
a plurality of voltage detectors 12a, which detect the bus voltage of each electric station 11a, 11b in the electric power system composed of b at Δt intervals, respectively.
12b and the respective voltages from the respective voltage detectors 12a, 12b transmitted via the transmission systems 13a, 13b, respectively, are input to detect the voltage phase angle difference θ between the two at a constant period ΔT, including the present time. Based on the voltage phase angle differences θ (t K ), θ (t K-1 ), and θ (t K-2 ) at three points, the voltage phase angle differences θ (of the future time points τ 1 , τ 2 , τ P ) τ 1 ), θ
(Τ 2 ), θ (τ P ) are predicted and calculated, and the change tendency of the predicted voltage phase angle differences θ (τ 1 ), θ (τ 2 ), ..., θ (τ P ) is θ (τ 1 ) <θ (τ 2 ) <θ (τ P ), and the value exceeds the specified value [θ (τ P )> θlim
It] and a step-out judging device 14 for judging that the step is out of step.
従って、現時点を含めて３点の電圧位相角差（実測値）
θ(tK-2)，θ(tK-1)，θ(tK)を基に、将来時点の電圧位
相角差θ（τ1），θ（τ2），……，θ（τP）を予測
演算し、この予測電圧位相角差（予測値）θ（τ1），
θ（τ2），……，θ（τP）の変化傾向が発散方向でし
かもその値が所定値を越えたことで脱調と判定するよう
にしているため、過去数点の電圧位相角差（実測値）を
用いて脱調を判定する場合に比べて、予測した時間分
（例えば、200〜300ミリ秒）だけ早い時点で、脱調を早
期に予測判定することが可能となる。Therefore, the voltage phase angle difference (measured value) at 3 points including the current time
Based on θ (t K-2 ), θ (t K-1 ), and θ (t K ), future voltage phase angle differences θ (τ 1 ), θ (τ 2 ),…, θ (τ P ) is predicted and calculated, and this predicted voltage phase angle difference (predicted value) θ (τ 1 ),
Since the change tendency of θ (τ 2 ), ..., θ (τ P ) is in the direction of divergence and the value exceeds the predetermined value, it is determined that the step is out of phase. Compared with the case of determining a step-out using the difference (actual measurement value), the step-out can be predicted and determined early at a time point that is predicted by the predicted time (for example, 200 to 300 milliseconds).
すなわち、電力系統の一般的な脱調現象は、非常に速い
現象（過渡一波脱調なら事故発生後１秒以内に発電機が
脱調する）であることから、200〜300ミリ秒の検出時間
の差は、安定化のための制御量（例えば、発電機の電源
制限量）に大きく影響する（100万kw以上の差が出る可
能性がある）。よって、脱調検出時間が遅くなればなる
程、それだけ発電機の電源制限量が大きくなる（場合に
よっては、100万kw以上の差が出る）。また、脱調現象
は非常に速いので、場合によっては間に合わず、大規模
な停電になる可能性もある。In other words, the general out-of-step phenomenon of the power system is a very fast phenomenon (in the case of transient single-wave out-of-step, the generator will be out of step within 1 second after the accident occurs). The time difference greatly affects the control amount for stabilization (for example, the power source limit amount of the generator) (there may be a difference of 1 million kw or more). Therefore, the slower the out-of-step detection time, the greater the power limit of the generator (in some cases, there will be a difference of 1 million kw or more). Also, the step-out phenomenon is so fast that it may not be in time in some cases and a large-scale power outage may occur.
この点、上記のようにして将来時点を予測判定すること
により、予測した時間分（例えば、200〜300ミリ秒）だ
け、脱調を早期に予測判定することが可能となることに
より、系統脱調の発生を未然に防止することができる。
よって、このような判定条件を用いて所定の系統安定化
制御を行なうことにより、系統脱調を未然に防止するこ
とができる。In this respect, by predicting and determining the future time point as described above, it becomes possible to predictively determine the out-of-step for the predicted time (for example, 200 to 300 milliseconds), and thus the system failure It is possible to prevent the occurrence of a key.
Therefore, by performing a predetermined system stabilization control using such a determination condition, it is possible to prevent a system out-of-step.
次に、上述した「予測した時間分（200〜300ミリ秒）だ
け、早期に脱調判定が可能となる」ことの根拠について
詳述する。Next, the grounds for the above-mentioned "out-of-step judgment can be made early by the predicted time (200 to 300 milliseconds)" will be described in detail.
すなわち、本実施例では、第６図に示すように、現時点
までに検出した電圧位相角差（実測値）θ(tK-2)，θ(t
K-1)，θ(tK)を基に、将来時点（例えば、200〜300ミリ
秒先）の電圧位相角差θ（τ1），θ（τ2），……，θ
（τP）を予測し、この予測電圧位相角差（予測値）を
基に脱調判定を行なっている。That is, in the present embodiment, as shown in FIG. 6, the voltage phase angle differences (actually measured values) θ (t K−2 ), θ (t
Based on K-1 ), θ (t K ), the voltage phase angle difference θ (τ 1 ), θ (τ 2 ),…, θ at a future time (for example, 200 to 300 milliseconds ahead)
(Τ P ) is predicted, and step out determination is performed based on this predicted voltage phase angle difference (predicted value).
従って、本実施例では、電圧位相角差θの動きを、常に
例えば200〜300ミリ秒だけ先立って把握していることに
なり、常にこの予測した時間分だけ、脱調判定を早い時
点で行なうことができる。Therefore, in this embodiment, the movement of the voltage phase angle difference θ is always grasped in advance for, for example, 200 to 300 milliseconds, and the step-out determination is always performed at an early point for this predicted time. be able to.
尚、上記実施例では、将来時点の電圧位相角差の予測演
算を２次式で行なったが、３次式以上のＮ次式で行なっ
ても同様の効果が得られるものである。この場合には、
現時点までの（Ｎ＋１）個の電圧位相角差が必要とな
る。In the above embodiment, the prediction calculation of the voltage phase angle difference at a future time point is performed by the quadratic equation, but the same effect can be obtained by performing it by the Nth-order equation of the cubic equation or more. In this case,
Up to the present time, (N + 1) voltage phase angle differences are required.
［発明の効果］ 以上説明したように本発明によれば、複数の電気所から
構成される電力系統の脱調を予測判定する装置におい
て、各電気所の電圧をそれぞれ検出する複数の電圧検出
器と、伝送系を介してそれぞれ伝送される各電圧検出器
からの各電圧を入力して両者の電圧位相角差を定周期で
検出し、現時点を含めて３点の当該電圧位相角差を基に
将来時点の電圧位相角差を予測演算し、かつこの予測電
圧位相角差の変化傾向が発散方向でしかもその値が所定
値を越えたことにより脱調と判定する脱調判定器とを備
えて構成したので、電力系統が脱調に至ることを早期に
予測判定して系統脱調を事前に防止することが可能な信
頼性の高い脱調検出装置が提供できる。[Effects of the Invention] As described above, according to the present invention, in a device for predicting and determining a step-out of a power system composed of a plurality of electric stations, a plurality of voltage detectors for detecting the voltages of the respective electric stations, respectively. Then, each voltage from each voltage detector transmitted through the transmission system is input to detect the voltage phase angle difference between the two at a fixed cycle, and the voltage phase angle difference at three points including the present time is used as a basis. In addition, a step-out judging device for predicting and calculating the voltage phase angle difference at a future time and for judging that the step-out is out of step because the changing tendency of the predicted voltage phase angle difference is in the diverging direction and the value exceeds a predetermined value. Since it is configured as described above, it is possible to provide a highly reliable step-out detection device capable of predicting and determining early that the power system will go out of step and preventing the step-out in advance.
第１図は本発明の一実施例を示す構成図、第２図は電圧
サンプリング値から電圧位相角差を検出する方法を説明
するための図、第３図は脱調判定器の作用を説明するた
めのフローチャート図、第４図は電力系統の一例を示す
構成図、第５図（ａ）〜（ｄ）は定常および脱調時の電
圧ベクトルおよび電圧位相角差の時間的変化を説明する
ための図、第６図は将来時点の電圧位相角差の演算方法
および脱調判定方法を説明するための図である。 1,2,3……系統、11a,11b……電気所、12a,12b……電圧
検出器、13a,13b……伝送系、14……脱調判定器。FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a diagram for explaining a method of detecting a voltage phase angle difference from a voltage sampling value, and FIG. FIG. 4 is a configuration diagram showing an example of a power system, and FIGS. 5 (a) to 5 (d) are diagrams for explaining temporal changes in voltage vector and voltage phase angle difference during steady state and step out. FIG. 6 is a diagram for explaining a calculation method of a voltage phase angle difference at a future time and a step out determination method. 1,2,3 …… system, 11a, 11b …… electric station, 12a, 12b …… voltage detector, 13a, 13b …… transmission system, 14 …… out-of-step judging device.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松沢 邦夫 東京都千代田区内幸町１丁目１番３号 東 京電力株式会社内 (72)発明者 大塚 均 東京都千代田区内幸町１丁目１番３号 東 京電力株式会社内 (72)発明者 小俣 和也 東京都府中市東芝町１番地 株式会社東芝 府中工場内 (72)発明者 佐藤 正弘 東京都府中市東芝町１番地 株式会社東芝 府中工場内 (56)参考文献 特開 昭57−183218（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kunio Matsuzawa 1-3-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Co., Inc. (72) Inventor Hitoshi Otsuka 1-3-1, Uchiyuki-cho, Chiyoda-ku, Tokyo East Within Kyodensha Co., Ltd. (72) Inventor Kazuya Omata No. 1 in Toshiba Fuchu, Tokyo Fuchu-shi, Tokyo Inside the Fuchu factory, Toshiba (72) Inventor Masahiro Sato No. 1 in Toshiba Fuchu, Tokyo, Fuchu factory (56) ) Reference JP-A-57-183218 (JP, A)
Claims (1)
調を予測判定する装置において、 前記各電気所の電圧をそれぞれ検出する複数の電圧検出
器と、 伝送系を介してそれぞれ伝送される前記各電圧検出器か
らの各電圧を入力して両者の電圧位相角差を定周期で検
出し、現時点を含めて３点の当該電圧位相角差を基に将
来時点の電圧位相角差を予測演算し、かつこの予測電圧
位相角差の変化傾向が発散方向でしかもその値が所定値
を越えたことにより脱調と判定する脱調判定器と、 を備えて成ることを特徴とする脱調検出装置。1. A device for predicting and determining a step-out of a power system composed of a plurality of electric stations, wherein a plurality of voltage detectors for detecting the voltages of the respective electric stations are respectively transmitted through a transmission system. By inputting each voltage from each of the voltage detectors, the voltage phase angle difference between the two is detected at a constant cycle, and the voltage phase angle difference at a future time point is calculated based on the voltage phase angle difference at three points including the current time point. A step-out judging device which makes a predictive calculation and judges that the step-out is out of step when the change tendency of the predicted voltage phase angle difference is in the diverging direction and the value thereof exceeds a predetermined value. Key detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60227029A JPH0714258B2 (en) | 1985-10-14 | 1985-10-14 | Step-out detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60227029A JPH0714258B2 (en) | 1985-10-14 | 1985-10-14 | Step-out detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6289421A JPS6289421A (en) | 1987-04-23 |
| JPH0714258B2 true JPH0714258B2 (en) | 1995-02-15 |
Family
ID=16854399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60227029A Expired - Lifetime JPH0714258B2 (en) | 1985-10-14 | 1985-10-14 | Step-out detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0714258B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2692793B2 (en) * | 1986-06-30 | 1997-12-17 | 東京電力株式会社 | Power system out-of-step predictor |
| JP2825238B2 (en) * | 1988-08-23 | 1998-11-18 | 東京電力株式会社 | Power system stabilizer |
| JP2664791B2 (en) * | 1990-01-16 | 1997-10-22 | 関西電力株式会社 | System separation device |
| JP3425221B2 (en) * | 1994-05-30 | 2003-07-14 | 株式会社東芝 | Power system stabilizer |
| EP2372739B1 (en) * | 2008-12-25 | 2015-02-18 | Mitsubishi Electric Corporation | Phase-control switchgear and method for controlling switchgear |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57183218A (en) * | 1981-05-06 | 1982-11-11 | Tokyo Shibaura Electric Co | Method of predicting stepout of power system |
-
1985
- 1985-10-14 JP JP60227029A patent/JPH0714258B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6289421A (en) | 1987-04-23 |
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