JPH0823627A - Out-of-step detecting device - Google Patents
Out-of-step detecting deviceInfo
- Publication number
- JPH0823627A JPH0823627A JP15566794A JP15566794A JPH0823627A JP H0823627 A JPH0823627 A JP H0823627A JP 15566794 A JP15566794 A JP 15566794A JP 15566794 A JP15566794 A JP 15566794A JP H0823627 A JPH0823627 A JP H0823627A
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- JP
- Japan
- Prior art keywords
- phase
- data
- circuit
- information
- transmitted
- 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.)
- Granted
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- Protection Of Generators And Motors (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、脱調検出装置に係り、
特に、発電機の並行運転を行っている電力系統の保護に
好適な脱調検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step-out detection device,
In particular, the present invention relates to a step-out detection device suitable for protecting an electric power system in which generators are operating in parallel.
【０００２】[0002]
【従来の技術】脱調現象とは、電力系統の事故などの原
因により、電気的中心を境にして両端電気所における発
電機の同期はずれのことである。2. Description of the Related Art A step-out phenomenon is a loss of synchronism of generators at both ends of an electric power plant with an electrical center as a boundary due to a cause such as an accident in a power system.
【０００３】脱調現象を両端電気所同士の位相変化から
捕えるものとすれば、系統平常時には二つの電気所同士
の位相角は６０°〜７０°以下で運転されていること、
系統動揺時の場合でも脱調していないときはせいぜい１
３５°程度が最大と考えられること、脱調時には明らか
に１８０°を越すことなどから、他の系統擾乱と脱調と
を極めて明確に区別できる（特開昭55−125022 号公
報）。If the out-of-step phenomenon is to be detected from the phase change between the electric stations at both ends, the phase angle between the two electric stations should be 60 ° to 70 ° or less during normal operation of the system.
At most 1 even when the system is upset
Since about 35 ° is considered to be the maximum and 180 ° is obviously exceeded at the time of out-of-step, it is possible to very clearly distinguish other system disturbances from out-of-step (JP-A-55-125022).
【０００４】図２に従来の脱調検出方法装置を示す。１
はＡ端電気所の電圧波形、２はＢ端電気所の電圧波形、
３はＢ端矩形波、４はパルスである。３のＢ端矩形波を
矩形波生成回路を用いて発生させ、４のパルスをパルス
数量子化回路により１サンプリング間隔（３０°）で位
相情報をパルスの数を数えることにより求める。FIG. 2 shows a conventional step-out detection method device. 1
Is the voltage waveform at the A-end electrical station, 2 is the voltage waveform at the B-terminal electrical station,
Reference numeral 3 is a B-end rectangular wave, and 4 is a pulse. The B-terminal rectangular wave of 3 is generated by using a rectangular wave generation circuit, and the pulse of 4 is obtained by counting the number of pulses at one sampling interval (30 °) by the pulse number quantization circuit.
【０００５】このためカウンタ形のＡ／Ｄ変換回路が必
要であり、矩形波生成回路やパルス数量子化回路などの
専用回路も必要である。Therefore, a counter type A / D conversion circuit is required, and a dedicated circuit such as a rectangular wave generation circuit and a pulse number quantization circuit is also required.
【０００６】また専用回路の使用に伴う位相計測誤差は
パルス数を４ビットデータに量子化しているため、１Ｌ
ＳＢ＝２°から量子化誤差は±１°となり、両端位相差
は最大２°となる。The phase measurement error associated with the use of the dedicated circuit quantizes the number of pulses into 4-bit data, so 1L
From SB = 2 °, the quantization error is ± 1 °, and the phase difference between both ends is 2 ° at maximum.
【０００７】図３はＡ端電気所における電圧ＶＡを基準
ベクトル（０°）とし、Ｂ端電気所における電圧ＶＢを
判定ベクトルとした位相特性を示したものである。図に
おいて、ｙ特性つまりＶＡに対してＶＢが線ｙより左に
存在するとき（９０°≦位相角≦２７０°のとき）の動
作する特性は、脱調と判定できる。FIG. 3 shows a phase characteristic in which the voltage VA at the A terminal electric station is used as a reference vector (0 °) and the voltage VB at the B terminal electric station is used as a determination vector. In the figure, the y characteristic, that is, the characteristic that operates when VB exists to the left of the line y with respect to VA (when 90 ° ≦ phase angle ≦ 270 °) can be determined to be step out.
【０００８】同様にして図におけるｘ特性は、進み位相
か遅れ位相かを判定することにより得られ、そのときに
脱調と判定できる。Similarly, the x characteristic in the figure is obtained by determining whether the phase is the lead phase or the lag phase, and it can be determined that the step is out of sync at that time.
【０００９】ｘ軸とｙ軸の組み合わせにより脱調を検出
する手段として、従来用いられており、そのための電圧
位相情報が必要であり、本発明は電圧位相情報の伝送手
段であり、そのｘ軸とｙ軸を見つける手段でもある。Conventionally used as means for detecting step-out by a combination of x-axis and y-axis, voltage phase information for that is required, and the present invention is a means for transmitting voltage phase information. Is also a means to find the y-axis.
【００１０】[0010]
【発明が解決しようとする課題】従来の脱調検出装置は
脱調検出用として矩形波生成回路やパルス数量子化回路
およびカウンタ形のＡ／Ｄ変換回路などの専用回路が必
要であり、専用回路の定期的な保守・点検が必要である
ことから、信頼性および経済性がよいとはいえない。さ
らに専用回路の故障時には、脱調検出に誤差を招くこと
になり、他の系統擾乱と脱調の区別が正確にできなくな
る。そこで、この区別を極めて明確に判定するために、
脱調検出用の前記専用回路の簡単化から信頼性および経
済性の向上を図れる脱調検出方法を提供する。The conventional out-of-step detecting device requires a dedicated circuit such as a rectangular wave generating circuit, a pulse number quantizing circuit, and a counter type A / D conversion circuit for detecting out-of-step. Since the circuit requires regular maintenance and inspection, it is not reliable and economical. Further, when a failure occurs in the dedicated circuit, an error occurs in step-out detection, and it becomes impossible to accurately distinguish the step-out from other system disturbances. Therefore, in order to judge this distinction very clearly,
Provided is a step-out detection method capable of improving reliability and economy by simplifying the dedicated circuit for step-out detection.
【００１１】[0011]
【課題を解決するための手段】本発明は上記の目的を達
成するために、電圧信号を１サンプリング間隔(30°)で
サンプリング毎にＡ／Ｄ変換し、所定の位相演算式から
位相角を算出し、得られた角度情報を伝送する。これよ
り脱調検出用の前記専用回路を取り除き、カウンタ形の
Ａ／Ｄ変換回路の替わりに標準のＡ／Ｄ変換回路を使用
できるように構成した。In order to achieve the above object, the present invention A / D-converts a voltage signal at every sampling interval (30 °) for each sampling, and calculates a phase angle from a predetermined phase calculation formula. The calculated angle information is transmitted. From this, the dedicated circuit for detecting the step-out is removed, and a standard A / D conversion circuit can be used instead of the counter type A / D conversion circuit.
【００１２】[0012]
【作用】電圧信号をサンプリング毎にＡ／Ｄ変換し、所
定の位相演算式から位相角を算出し、得られた角度情報
を伝送する。The voltage signal is A / D converted for each sampling, the phase angle is calculated from a predetermined phase calculation formula, and the obtained angle information is transmitted.
【００１３】[0013]
【実施例】図１は本発明の脱調検出装置の一実施例を示
す。１はＡ端電気所の電圧波形、２はＢ端電気所の電圧
波形である。Ｂ端電気所の電圧波形２から電圧サンプリ
ングデータを１サンプリング間隔（３０°）でサンプリ
ング毎にＡ／Ｄ変換する。前回データＶ1 および今回デ
ータＶ2 が共に正および負の場合は位相情報30°を伝送
する。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a step-out detection device of the present invention. Reference numeral 1 is a voltage waveform at the A terminal electrical station, and 2 is a voltage waveform at the B terminal electrical station. The voltage sampling data from the voltage waveform 2 at the B-end electric station is A / D converted at every sampling interval (30 °) for each sampling. When the previous data V 1 and the current data V 2 are both positive and negative, the phase information 30 ° is transmitted.
【００１４】前回データＶ0 が負で今回データＶ1 が正
の場合は、所定の位相演算式の数１により算出した位相
情報θを伝送する。When the previous data V 0 is negative and the current data V 1 is positive, the phase information θ calculated by the predetermined phase calculation formula 1 is transmitted.
【００１５】[0015]
【数１】 [Equation 1]
【００１６】数１は０°≦θ≦３０°のため、テイラー
展開条件を必ず満たすのでテイラー展開により、近似で
算出する。Since the expression 1 satisfies 0 ° ≦ θ ≦ 30 °, the condition of Taylor expansion is always satisfied, and therefore, it is calculated by approximation by Taylor expansion.
【００１７】前回データＶ6 が正で今回データＶ7 が負
の場合は所定の位相演算式の数２により算出した位相情
報θを伝送する。When the previous data V 6 is positive and the current data V 7 is negative, the phase information θ calculated by the predetermined phase calculation formula 2 is transmitted.
【００１８】[0018]
【数２】 [Equation 2]
【００１９】数２は０°≦θ≦３０°のため、テイラー
展開条件を必ず満たすのでテイラー展開により、近似で
算出する。Since the equation 2 satisfies 0 ° ≦ θ ≦ 30 °, the condition of Taylor expansion is always satisfied, and therefore it is calculated by approximation by Taylor expansion.
【００２０】本発明の位相計測誤差は角度情報θを４ビ
ットデータに量子化したとき、両端位相差は最大２°と
なり、従来装置と同じ精度となっている。The phase measurement error of the present invention has a maximum phase difference of 2 ° at both ends when the angle information θ is quantized into 4-bit data, and has the same accuracy as the conventional device.
【００２１】[0021]
【発明の効果】本発明によれば脱調検出用の矩形波生成
回路やパルス数量子化回路などの専用回路が不必要とな
り、保守・点検も不必要となる。更に両端位相差最大誤
差は最大２°であり、経済性の向上が可能になる。According to the present invention, a dedicated circuit such as a rectangular wave generation circuit for detecting out-of-step and a pulse number quantization circuit is unnecessary, and maintenance and inspection are also unnecessary. Further, the maximum error of the phase difference between both ends is 2 ° at the maximum, which makes it possible to improve the economical efficiency.
【００２２】カウンタ形のＡ／Ｄ変換回路の替わりに標
準のＡ／Ｄ変換回路を使用でき、他のリレー入力情報と
しても使用可能になる。A standard A / D conversion circuit can be used in place of the counter type A / D conversion circuit, and can also be used as other relay input information.
【図１】本発明の脱調検出装置の実施例を示す説明図。FIG. 1 is an explanatory diagram showing an embodiment of a step-out detection device of the present invention.
【図２】脱調検出装置の従来方法を示す説明図。FIG. 2 is an explanatory view showing a conventional method of a step-out detection device.
【図３】本発明の脱調検出装置の位相特性を示す説明
図。FIG. 3 is an explanatory diagram showing phase characteristics of the step-out detection device of the present invention.
１…Ａ端電気所の電圧波形、２…Ｂ端電気所の電圧波
形、３…Ｂ端矩形波、４…パルス。1 ... Voltage waveform of A terminal electric station, 2 ... Voltage waveform of B terminal electric station, 3 ... B rectangular wave, 4 ... Pulse.
Claims (1)
の位相情報を他の情報とともに伝送信号のうち少なくと
も前記位相情報を用いて前記電力系統において、他の系
統擾乱と脱調とを極めて明確に区別する装置において、
前記交流電気量を１サンプリング間隔毎にディジタル符
号に変換し、前記サンプリング間隔毎にディジタル符号
を他の情報とともに周期的にそれぞれ伝送する手段と、
伝送信号の中の位相情報の変化から前記交流電気量を検
出手段と、前記検出手段の出力を比較して前記交流電気
量の位相関係を判定する判定手段とを有し、前記サンプ
リング間隔で、電圧値を所定演算式に基づいて算出した
角度情報として伝送することを特徴とする脱調検出装
置。1. The power system is provided with phase information of AC electric quantities at each terminal of a protected section of the power system together with other information, and at least the phase information of a transmission signal is used to determine other system disturbances and step-outs in the power system. In a very distinct device,
Means for converting the alternating-current electricity quantity into a digital code at every sampling interval and periodically transmitting the digital code together with other information at each sampling interval;
From the change of the phase information in the transmission signal from the alternating current electricity amount detection means, having a determination means for comparing the output of the detection means to determine the phase relationship of the alternating current electricity amount, at the sampling interval, A step-out detection device which transmits a voltage value as angle information calculated based on a predetermined arithmetic expression.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06155667A JP3104531B2 (en) | 1994-07-07 | 1994-07-07 | Step-out detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06155667A JP3104531B2 (en) | 1994-07-07 | 1994-07-07 | Step-out detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0823627A true JPH0823627A (en) | 1996-01-23 |
| JP3104531B2 JP3104531B2 (en) | 2000-10-30 |
Family
ID=15610962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06155667A Expired - Fee Related JP3104531B2 (en) | 1994-07-07 | 1994-07-07 | Step-out detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3104531B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0869599A2 (en) * | 1997-04-02 | 1998-10-07 | Kabushiki Kaisha Toshiba | Method and apparatus for detecting out-of-step in electric power system |
| WO2010073331A1 (en) * | 2008-12-25 | 2010-07-01 | 三菱電機株式会社 | Phase-control switchgear and method for controlling switchgear |
-
1994
- 1994-07-07 JP JP06155667A patent/JP3104531B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0869599A2 (en) * | 1997-04-02 | 1998-10-07 | Kabushiki Kaisha Toshiba | Method and apparatus for detecting out-of-step in electric power system |
| EP0869599A3 (en) * | 1997-04-02 | 2000-01-19 | Kabushiki Kaisha Toshiba | Method and apparatus for detecting out-of-step in electric power system |
| WO2010073331A1 (en) * | 2008-12-25 | 2010-07-01 | 三菱電機株式会社 | Phase-control switchgear and method for controlling switchgear |
| JP5143237B2 (en) * | 2008-12-25 | 2013-02-13 | 三菱電機株式会社 | Phase control switchgear and phase control method for switchgear |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3104531B2 (en) | 2000-10-30 |
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