JP2000358331A - Individual operation detector for synchronous generator - Google Patents

Individual operation detector for synchronous generator

Info

Publication number
JP2000358331A
JP2000358331A JP11166326A JP16632699A JP2000358331A JP 2000358331 A JP2000358331 A JP 2000358331A JP 11166326 A JP11166326 A JP 11166326A JP 16632699 A JP16632699 A JP 16632699A JP 2000358331 A JP2000358331 A JP 2000358331A
Authority
JP
Japan
Prior art keywords
frequency
amount
generator
synchronous generator
fluctuation
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
Application number
JP11166326A
Other languages
Japanese (ja)
Inventor
Hirotoshi Kaneda
裕敏 金田
Takaaki Kai
隆章 甲斐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Meidensha Corp, Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Corp
Priority to JP11166326A priority Critical patent/JP2000358331A/en
Publication of JP2000358331A publication Critical patent/JP2000358331A/en
Pending legal-status Critical Current

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  • Control Of Eletrric Generators (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an individual operation detector for rapidly, effectively detecting an individual operation of a synchronous generator and simplifying settling or the like for detecting the individual operation. SOLUTION: Individual operation detector for a synchronous generator obtains the frequency of an interlocking point of a frequency calculator 8A, obtains a change ratio (df/dt) by a frequency change ratio calculator 8B, obtains an amount proportional to the change ratio by a coefficient unit 8C, limits the amount by an output limiter 8D, and feeds back a positive voltage amount to an automatic voltage regulator 3A of the generator 3. In this case, the detector generates an infinitesimal change amount to be suppressed at the frequency change, when the generator is in an interlocked state and a change amount of a predetermined period, and superposes the change amount on a positive feedback amount to obtain a frequency change by the infinitesimal change amount, even in a state in which the load of a range of the individual operation is completely balanced with the output of the generator, thereby detecting the individual operation. It includes to superpose the change amount on the frequency change amount instead of the frequency changer ratio.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、逆潮流有りの条件
で配電系統に連系される同期発電機の単独運転検出装置
に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting the isolated operation of a synchronous generator connected to a power distribution system under the condition of reverse power flow.

【0002】[0002]

【従来の技術】分散型電源を逆潮流有りの条件で高圧配
電系統に連系する場合、この電源の単独運転を防止する
対策を講じなければならない。これに対し通産省では、
分散型電源を系統に連系する場合の技術要件を「系統連
系技術要件ガイドライン」にまとめている。これによれ
ば、上述の単独運転防止対策として、従来の受動的方式
になる転送遮断装置のほか、能動的に発電機の単独運転
を検出する単独運転検出装置が認められている。
2. Description of the Related Art When a distributed power supply is connected to a high-voltage distribution system under the condition of reverse power flow, measures must be taken to prevent the power supply from operating alone. In contrast, the Ministry of International Trade and Industry
The technical requirements for connecting distributed power sources to the grid are summarized in the "Guidelines for Grid Connection Technical Requirements". According to this, as an above-described measure for preventing the islanding operation, an islanding operation detection device that actively detects the islanding operation of the generator is recognized in addition to the transfer interruption device that is a conventional passive system.

【0003】また、同期発電機などの回転機系分散型電
源に対する単独運転防止対策として単独運転検出装置を
採用する場合、この装置には能動的方式を1つ以上を含
む二方式以上の単独運転検出方式を適用することが規定
されている。これは、単独運転の範囲内にある負荷と発
電機の出力とが釣り合った状態で単独運転に移行した場
合、単独運転移行後の発電機の出力や周波数などは変化
せず、受動的方式のみでは単独運転を検出できないこと
による。
[0003] When an islanding operation detecting device is employed as a countermeasure for preventing the islanding operation of a rotating machine system distributed type power source such as a synchronous generator, the device has two or more islanding operation systems including one or more active systems. It is stipulated that a detection method is applied. This is because when the operation shifts to the islanding operation when the load within the range of the islanding operation and the output of the generator are balanced, the output and frequency of the generator after the transition to the islanding operation do not change, only the passive system This is because islanding cannot be detected.

【0004】以上のことから、現在開発されている回転
機系分散型電源用の単独運転検出装置には能動的方式と
受動的方式とをそれぞれ一方式ずつ適用したものが一般
的となっている。このうち、同期発電機用の単独運転検
出装置に適用される主な能動的方式として、無効電力変
動方式やQCモード周波数シフト方式がある。
[0004] From the above, it is general that an active system and a passive system are applied to each of the isolated operation detection devices for a rotating machine system distributed type power supply which are currently being developed. . Among them, the main active systems applied to the isolated operation detection device for the synchronous generator include a reactive power fluctuation system and a QC mode frequency shift system.

【0005】無効電力変動方式は、その構成図を図5
に、諸電気量の変化を図6に示す。受電設備は、系統電
源1から高圧配電線2を通して受電し、同期発電機
(G)3から変圧器4及びしゃ断器5を通して系統に連
系して負荷6に給電する。
The configuration diagram of the reactive power fluctuation method is shown in FIG.
FIG. 6 shows changes in various electric quantities. The power receiving equipment receives power from the system power supply 1 through the high-voltage distribution line 2, and supplies power to the load 6 from the synchronous generator (G) 3 through the transformer 4 and the circuit breaker 5 in connection with the system.

【0006】単独運転検出装置7は、同期発電機3の自
動電圧調整回路(AVR)3Aの電圧設定値に対し、微
少変動量発生器7Aによって、一定周期の微少変動(A
VR電圧設定値変動量)を常時与えておく。これによ
り、同期発電機3に微少の電圧変動が発生しようとする
が、系統との連系状態では同期化力によって周波数変化
が抑制されるが、同期発電機3が単独運転に移行したと
きには発電機端子電圧及び周波数に周期的な変動が発生
する。周波数変動量演算部7Bは、PTにより検出する
連系点電圧より周波数変動量Δfをディジタル演算等で
検出しておき、この周波数変動量Δfが一定値を越えた
ことを判定部7Cが判定したときに、同期発電機4が単
独運転に移行したと判定し、この判定でしゃ断器5のト
リップ指令を発生し、同期発電機3を系統から切り離
す。
[0006] The isolated operation detection device 7 uses a small fluctuation amount generator 7A to generate a small fluctuation (A) of a constant cycle with respect to a voltage set value of an automatic voltage adjustment circuit (AVR) 3A of the synchronous generator 3.
VR voltage set value fluctuation amount) is always given. As a result, a small voltage fluctuation is likely to occur in the synchronous generator 3, but the frequency change is suppressed by the synchronizing force in an interconnected state with the grid, but when the synchronous generator 3 shifts to the isolated operation, the power is generated. Periodic fluctuations occur in terminal voltage and frequency. The frequency variation calculation unit 7B detects the frequency variation Δf from the interconnection point voltage detected by PT by digital calculation or the like, and the determination unit 7C determines that the frequency variation Δf has exceeded a certain value. At this time, it is determined that the synchronous generator 4 has shifted to the isolated operation, and in this determination, a trip command for the circuit breaker 5 is generated, and the synchronous generator 3 is disconnected from the system.

【0007】QCモード周波数シフト方式は、その構成
図を図7に、諸電気量の変化を図8に示す。この方式に
おける単独運転検出装置8は、周波数演算部8Aによっ
て周波数fを求め、この周波数fの周波数変化率(df
/dt)を周波数変化率演算部8Bで求め、この周波数
変化率(df/dt)に係数器8Cで一定の定数kを乗
じ、出力リミッタ部8Dで出力電圧を制限して自動電圧
調整回路(AVR)3Aの電圧設定値に負極性で印加す
る。
FIG. 7 is a diagram showing the configuration of the QC mode frequency shift system, and FIG. 8 shows changes in various electric quantities. In the islanding detection device 8 in this method, the frequency f is obtained by the frequency calculation unit 8A, and the frequency change rate (df
/ Dt) is calculated by a frequency change rate calculation unit 8B, the frequency change rate (df / dt) is multiplied by a constant k by a coefficient unit 8C, and the output voltage is limited by an output limiter unit 8D to control an automatic voltage adjustment circuit ( AVR) A negative voltage is applied to the voltage set value of 3A.

【0008】この電圧加算により、電圧上昇に対しては
発電機3出力が増して周波数が低下することからその時
間的変化分は負になり、自動電圧調整回路3Aには電圧
設定値に反対符号で加えるため電圧上げ方向に制御す
る。つまり、発電機の周波数が更に低下するように制御
する。逆に、電圧低下に対しては、同様に電圧下げ方向
に制御する。このような帰還は、正帰還と呼ばれる。こ
の正帰還に対して、系統連系時には商用電源により周波
数はほぼ一定に保たれるので、発電機の周波数も殆ど変
動しない。しかし、単独運転移行時に発電機の周波数が
少しでも変動すれば、この変動は正帰還により増幅され
るため、この周波数変動量Δfを周波数変動量演算部8
Eによって検出しておき、判定部8Fによって単独運転
を検出したときにしゃ断器5のトリップを行う。
As a result of this voltage addition, the output of the generator 3 increases with a rise in the voltage and the frequency decreases, so that the temporal change becomes negative. Control in the voltage increasing direction to add in That is, control is performed such that the frequency of the generator is further reduced. Conversely, for a voltage drop, control is similarly performed in the voltage drop direction. Such feedback is called positive feedback. In contrast to the positive feedback, the frequency is kept substantially constant by the commercial power supply at the time of system interconnection, so that the frequency of the generator hardly fluctuates. However, if the frequency of the generator fluctuates even a little during the transition to the islanding operation, the fluctuation is amplified by positive feedback.
The circuit breaker 5 is tripped when the isolated operation is detected by the determination unit 8F.

【0009】[0009]

【発明が解決しようとする課題】従来の無効電力変動方
式による単独運転検出装置は、高速に単独運転を検出す
るためにはAVR電圧設定値変動量を大きくすれば良
い。反面、この変動量により系統連系時の電圧変動も大
きくなる。この傾向は発電機容量が大きい場合や、発電
機が配電用変電所から遠方に連系される場合には強ま
る。
In the conventional islanding operation detecting apparatus using the reactive power fluctuation method, the amount of change in the AVR voltage set value can be increased in order to detect the islanding operation at high speed. On the other hand, the amount of the fluctuation also increases the voltage fluctuation during system interconnection. This tendency becomes stronger when the generator capacity is large or when the generator is connected far from the distribution substation.

【0010】このような場合、要求される単独運転検出
時間を満たすように決められたAVR電圧設定値変動量
に対して、系統連系時の電圧変動量がその許容値を上回
ることがあり、電力品質の低下を招くと共に、他の制御
機器などへの影響を与える恐れがある。
[0010] In such a case, the voltage fluctuation during system interconnection may exceed the allowable value for the AVR voltage set value fluctuation determined to satisfy the required islanding detection time, The power quality may be degraded, and other control devices may be affected.

【0011】また、無効電力変動方式による単独独運転
移行後の発電機周波数変動量は、発電機出力、発電機運
転力率、発電機の制御方式、発電機定数(特に慣性)
や、AVR電圧設定値変動量の大きさ、周波数、および
単独運転移行時におけるAVR電圧設定値変動量の位相
などにより異なる。
Further, the generator frequency fluctuation after the transition to the isolated operation by the reactive power fluctuation method includes the generator output, the generator operation power factor, the generator control method, and the generator constant (particularly, inertia).
And the magnitude and frequency of the AVR voltage set value fluctuation amount, and the phase of the AVR voltage set value fluctuation amount at the time of transition to the isolated operation.

【0012】以上のことから、従来の無効電力変動方式
の整定値の決定には、上記の条件を全て把握した上で、
コンピュータによる厳密なシミュレーションが必要とな
り、煩雑なものであった。
From the above, in order to determine the set value of the conventional reactive power fluctuation method, after grasping all of the above conditions,
A strict simulation by a computer was required, which was complicated.

【0013】一方、QCモード周波数シフト方式では、
周波数変化率(df/dt)に比例した量を能動的方式
信号として自動電圧調整回路(AVR)に正帰還してい
るが、単独運転の範囲内にある負荷と発電機の出力とが
完全に釣り合った状態で単独運転に移行した場合、理論
的には単独運転移行前後での発電機の周波数は全く変化
しないので、このような条件では原理的に単独運転を検
出することはできないし、釣り合い状態変化後の検出で
は単独運転検出が遅れる。
On the other hand, in the QC mode frequency shift system,
The amount proportional to the frequency change rate (df / dt) is positively fed back to the automatic voltage regulation circuit (AVR) as an active mode signal, but the load within the range of the isolated operation and the output of the generator are completely reduced. If the operation shifts to the islanding operation in a balanced state, theoretically, the frequency of the generator before and after the operation shift to the islanding operation does not change at all. Therefore, under such conditions, the islanding operation cannot be detected in principle, and In the detection after the state change, the islanding detection is delayed.

【0014】本発明の目的は、同期発電機の単独運転検
出を高速かつ確実にし、また単独運転検出のための整定
等を簡単にした単独運転検出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 an islanding operation detection device which can quickly and reliably detect the islanding operation of a synchronous generator, and can simplify settling for the islanding operation detection.

【0015】[0015]

【課題を解決するための手段】本発明は、前記課題を解
決するため、連系点の周波数変化率(df/dt)また
は周波数変動量(Δf)に比例した量に、一定周期で変
動する微少変動量を重畳させたものを発電機の自動電圧
調整回路に正帰還し、周波数変動量から発電機の単独運
転を判定するようにしたもので、以下の構成を特徴とす
る。
According to the present invention, in order to solve the above-mentioned problems, the present invention changes at a constant period to an amount proportional to a frequency change rate (df / dt) or a frequency change amount (Δf) at an interconnection point. The circuit in which the minute fluctuation amount is superimposed is fed back to the automatic voltage adjustment circuit of the generator to determine the independent operation of the generator from the frequency fluctuation amount, and has the following configuration.

【0016】同期発電機を逆潮流有りの条件で配電系統
に連系し、連系点の周波数変動量が整定値を越えたとき
に前記同期発電機の単独運転として検出する能動的方式
の単独運転検出装置であって、前記連系点の周波数変化
率又は周波数変動量に比例した量を得、この量を前記同
期発電機の自動電圧調整回路への電圧正帰還量にする演
算手段と、前記同期発電機が連系状態にあるときの周波
数変動を抑制できる微少な変動量でかつ一定周期の変動
量で前記正帰還量に重畳させる微少変動量発生器と、を
備えたことを特徴とする。
[0016] An active system in which the synchronous generator is interconnected to the distribution system under the condition of reverse power flow, and when the amount of frequency fluctuation at the interconnection point exceeds a set value, the synchronous generator is detected as an independent operation. An operation detecting device, which obtains an amount proportional to the frequency change rate or the frequency fluctuation amount of the interconnection point, and calculates this amount as a voltage positive feedback amount to an automatic voltage adjustment circuit of the synchronous generator, A minute fluctuation amount generator that is superimposed on the positive feedback amount with a minute fluctuation amount that can suppress frequency fluctuation when the synchronous generator is in an interconnected state and a fluctuation amount of a constant cycle, I do.

【0017】[0017]

【発明の実施の形態】(第1の実施形態)図1は、本発
明の実施形態を示す構成図であり、図7と同等の部分は
同一符号で示す。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention, and portions equivalent to those in FIG.

【0018】単独運転検出装置10は、従来のQCモー
ド周波数シフト方式の装置8と同様に、周波数演算部8
Aによって周波数fを求め、この周波数fの周波数変化
率(df/dt)を周波数変化率演算部8Bで求め、こ
の周波数変化率(df/dt)に係数器8Cで一定の定
数kを乗じ、出力リミッタ部8Dで出力電圧を制限して
自動電圧調整回路(AVR)3Aの電圧設定値に負極性
で印加する構成に加えて、微少変動量発生器10Aを設
ける。
The islanding detection device 10 includes a frequency calculation unit 8 like the conventional QC mode frequency shift type device 8.
The frequency f is obtained by A, the frequency change rate (df / dt) of this frequency f is obtained by the frequency change rate calculation unit 8B, and the frequency change rate (df / dt) is multiplied by a constant k by a coefficient unit 8C. In addition to the configuration in which the output voltage is limited by the output limiter unit 8D and applied to the voltage set value of the automatic voltage adjustment circuit (AVR) 3A with a negative polarity, a minute fluctuation generator 10A is provided.

【0019】この微少変動量発生器10Aは一定周期で
変化する微少な電圧を発生し、係数器8Cからの周波数
変化率(df/dt)に比例した電圧に重畳させ、この
電圧を同期発電機3の自動電圧調整回路(AVR)3A
の電圧設定値に対して能動的方式信号として与える。
The minute fluctuation generator 10A generates a minute voltage that changes in a constant cycle, and superimposes it on a voltage proportional to the frequency change rate (df / dt) from the coefficient unit 8C, and this voltage is used as a synchronous generator. 3 automatic voltage adjustment circuit (AVR) 3A
Is given as an active mode signal for the voltage set value.

【0020】単独運転検出装置10の周波数リレー10
Bは、周波数変動量演算部8Eで求める周波数変動量
(Δf)が整定値以上になったことを検出する。この検
出状態が一定時間以上継続したときにタイマ10Cに単
独運転判定出力を得る。ただし、この方式による単独運
転移行後の周波数は、図2に諸電気量の変化を示すよう
に、上昇、低下を繰り返すため、タイマ10Cは積分方
式とする。
The frequency relay 10 of the isolated operation detection device 10
B detects that the frequency variation (Δf) obtained by the frequency variation calculator 8E has become equal to or larger than the set value. When this detection state continues for a predetermined time or more, an isolated operation determination output is obtained from the timer 10C. However, since the frequency after the transition to the islanding operation by this method repeatedly increases and decreases as shown in FIG. 2, the timer 10C is of the integral type.

【0021】本実施形態によれば、周波数変化率(df
/dt)に比例した量に微少変動量発生器10Aからの
微少な変動量を重畳させて自動電圧調整回路(AVR)
3Aに正帰還するため、単独運転の範囲内にある負荷と
発電機の出力とが完全に釣り合った状態で単独運転に移
行した場合にも微少変動量発生器10Aによる微少変動
量で発電機の周波数が変化し、しかも正帰還により周波
数変動が増幅され、発電機3の単独運転を確実に検出す
ることができる。
According to the present embodiment, the frequency change rate (df
/ Dt) by superimposing the minute fluctuation amount from the minute fluctuation amount generator 10A on the amount proportional to the automatic voltage adjustment circuit (AVR).
Since the positive feedback to 3A is performed, even when the operation is shifted to the standalone operation in a state where the load within the range of the isolated operation and the output of the generator are perfectly balanced, the generator is controlled by the small variation amount by the small variation generator 10A. The frequency changes, and the frequency fluctuation is amplified by positive feedback, so that the isolated operation of the generator 3 can be reliably detected.

【0022】また、微少変動量発生器10Aの微少変動
量は、小さくするも正帰還により高速検出ができる。
The minute fluctuation amount of the minute fluctuation amount generator 10A can be detected at high speed by positive feedback even though the fluctuation amount is small.

【0023】しかも、微少変動量を小さくできること
は、AVR電圧設定値変動量を小さくでき、これにより
単独運転移行後の発電機周波数変動への影響や系統連系
時の他の機器への影響を小さくできる。この結果、微少
変動量発生器10Aの変動量の大きさや周期(周波数)
及び周波数リレー10Bでの整定値は、さほど厳密に決
定する必要はなく、容易に決定することができる。
Furthermore, the fact that the small fluctuation amount can be reduced means that the AVR voltage set value fluctuation amount can be reduced, thereby reducing the influence on the generator frequency fluctuation after the shift to the isolated operation and the influence on other devices at the time of system interconnection. Can be smaller. As a result, the magnitude and cycle (frequency) of the fluctuation amount of the minute fluctuation amount generator 10A
The setting value in the frequency relay 10B does not need to be determined so strictly, and can be easily determined.

【0024】(第2の実施形態)図3は、本発明の他の
実施形態を示す構成図であり、図4に諸電気量の変化を
示す。図3が図1と異なる部分は、周波数変動量演算部
8Eで求める周波数変動量(Δf)に比例した量を係数
器8Cに得、これに微少変動量発生器10Aからの微少
変動量を加え、これを同期発電機3の自動電圧調整回路
(AVR)3Aの電圧設定値に対して能動的方式信号と
して与える点にある。
(Second Embodiment) FIG. 3 is a block diagram showing another embodiment of the present invention, and FIG. 4 shows changes in various electric quantities. 3 is different from FIG. 1 in that an amount proportional to the frequency variation (Δf) obtained by the frequency variation calculator 8E is obtained in the coefficient unit 8C, and the minute variation from the small variation generator 10A is added thereto. This is to give this as an active system signal to the voltage set value of the automatic voltage regulator (AVR) 3A of the synchronous generator 3.

【0025】なお、周波数変動量演算部8Eは、PTに
より検出した連系点電圧より周波数の変動量周波数(Δ
f)を求める。
The frequency variation calculator 8E calculates the frequency variation (ΔΔT) from the interconnection point voltage detected by the PT.
Find f).

【0026】本実施形態による単独運転の判定は、系統
の基準周波数に対する周波数の変動量(Δf)を求め、
この値が周波数リレーでの整定値以上になり、かつタイ
マ10Cの規定時間を越えた場合に単独運転と判定す
る。
The determination of the islanding operation according to the present embodiment is performed by obtaining a frequency variation (Δf) with respect to the reference frequency of the system,
If this value is equal to or more than the set value of the frequency relay and exceeds the specified time of the timer 10C, it is determined that the operation is the isolated operation.

【0027】本実施形態においても、前記の第1の実施
形態と同様に、単独運転の範囲内にある負荷と発電機の
出力とが完全に釣り合った状態で単独運転に移行した場
合にも発電機3の単独運転を確実に検出することができ
るし、高速検出ができる。また、微少変動量発生器10
Aの変動量の大きさや周期(周波数)及び周波数リレー
10Bでの整定値は、さほど厳密に決定する必要はな
く、簡単に決定することができる。
In this embodiment, as in the case of the first embodiment, even when the operation is shifted to the islanding operation when the load within the range of the islanding operation and the output of the generator are perfectly balanced, the power generation is also performed. The isolated operation of the machine 3 can be reliably detected, and high-speed detection can be performed. Further, the minute fluctuation amount generator 10
The magnitude and period (frequency) of the fluctuation amount of A and the set value at the frequency relay 10B do not need to be determined so precisely, but can be determined easily.

【0028】[0028]

【発明の効果】以上のとおり、本発明によれば、連系点
の周波数変化率(df/dt)または周波数変動量(Δ
f)に比例した量に、一定周期で変動する微少変動量を
重畳させたものを発電機の自動電圧調整回路に正帰還
し、周波数変動量から発電機の単独運転を判定するよう
にしたため、同期発電機の単独運転検出を高速かつ確実
にし、また単独運転検出のための整定等が簡単になる。
As described above, according to the present invention, the frequency change rate (df / dt) or the frequency variation (Δ
f) The amount proportional to f) is superimposed with the minute fluctuation amount that fluctuates in a constant cycle, and the result is positively fed back to the automatic voltage adjustment circuit of the generator to determine the single operation of the generator from the frequency fluctuation amount. Detection of the isolated operation of the synchronous generator is performed at high speed and reliably, and settling for the detection of the isolated operation is simplified.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の第1の実施形態を示す構成図。FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

【図2】図1における諸電気量の変化。FIG. 2 shows changes in various electric quantities in FIG.

【図3】本発明の第2の実施形態を示す構成図。FIG. 3 is a configuration diagram showing a second embodiment of the present invention.

【図4】図3における諸電気量の変化。FIG. 4 shows changes in various electric quantities in FIG.

【図5】従来の無効電力変動方式の構成図。FIG. 5 is a configuration diagram of a conventional reactive power fluctuation method.

【図6】無効電力変動方式による諸電気量の変化。FIG. 6 shows changes in various electric quantities according to a reactive power fluctuation method.

【図7】従来のQCモード周波数シフト方式の構成図。FIG. 7 is a configuration diagram of a conventional QC mode frequency shift method.

【図8】QCモード周波数シフト方式による諸電気量の
変化。
FIG. 8 shows changes in various electric quantities according to the QC mode frequency shift method.

【符号の説明】[Explanation of symbols]

1… 2… 3…同期発電機 7、8、10、11…単独運転検出装置 8A…周波数演算部 8B…周波数変化率演算部 8C…係数器 8D…出力リミッタ 8E…周波数変動量演算部 10A…微少変動量発生器 10B…周波数リレー 10C…タイマ DESCRIPTION OF SYMBOLS 1 ... 2 ... 3 ... Synchronous generator 7, 8, 10, 11 ... Single operation detection device 8A ... Frequency calculation part 8B ... Frequency change rate calculation part 8C ... Coefficient unit 8D ... Output limiter 8E ... Frequency fluctuation amount calculation part 10A ... Micro fluctuation generator 10B ... Frequency relay 10C ... Timer

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 5G066 HA11 HB02 5H590 AA08 AA21 CC01 CE01 DD64 EA13 EB02 EB21 FC25 GA02 HA02 HA09 HB02 JA08 JA09 JA13 JA14 JA15  ──────────────────────────────────────────────────続 き Continued from the front page F term (reference) 5G066 HA11 HB02 5H590 AA08 AA21 CC01 CE01 DD64 EA13 EB02 EB21 FC25 GA02 HA02 HA09 HB02 JA08 JA09 JA13 JA14 JA15

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 同期発電機を逆潮流有りの条件で配電系
統に連系し、連系点の周波数変動量が整定値を越えたと
きに前記同期発電機の単独運転として検出する能動的方
式の単独運転検出装置であって、 前記連系点の周波数変化率又は周波数変動量に比例した
量を得、この量を前記同期発電機の自動電圧調整回路へ
の電圧正帰還量にする演算手段と、 前記同期発電機が連系状態にあるときの周波数変動を抑
制できる微少な変動量でかつ一定周期の変動量で前記正
帰還量に重畳させる微少変動量発生器と、を備えたこと
を特徴とする同期発電機の単独運転検出装置。
1. An active system in which a synchronous generator is connected to a distribution system under the condition of reverse power flow, and when the amount of frequency fluctuation at an interconnection point exceeds a set value, the synchronous generator is detected as an isolated operation. Calculating means for obtaining an amount proportional to the frequency change rate or the frequency change amount of the interconnection point, and using this amount as a voltage positive feedback amount to the automatic voltage adjustment circuit of the synchronous generator. And a minute fluctuation amount generator that is superimposed on the positive feedback amount with a minute fluctuation amount that can suppress a frequency fluctuation when the synchronous generator is in an interconnected state and a fluctuation amount of a constant cycle. Characteristic feature is an isolated operation detection device for a synchronous generator.
JP11166326A 1999-06-14 1999-06-14 Individual operation detector for synchronous generator Pending JP2000358331A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11166326A JP2000358331A (en) 1999-06-14 1999-06-14 Individual operation detector for synchronous generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11166326A JP2000358331A (en) 1999-06-14 1999-06-14 Individual operation detector for synchronous generator

Publications (1)

Publication Number Publication Date
JP2000358331A true JP2000358331A (en) 2000-12-26

Family

ID=15829295

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11166326A Pending JP2000358331A (en) 1999-06-14 1999-06-14 Individual operation detector for synchronous generator

Country Status (1)

Country Link
JP (1) JP2000358331A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007252128A (en) * 2006-03-17 2007-09-27 Fuji Electric Systems Co Ltd Independent operation detection device for synchronous generator having power system stabilizing function
JP2007252127A (en) * 2006-03-17 2007-09-27 Fuji Electric Systems Co Ltd Independent operation detection device for synchronous generator
JP2008259400A (en) * 2007-03-09 2008-10-23 Omron Corp Independent operation detection method, controller for detecting independent operation of distributed power supply, independent operation detection device, and distributed power supply system
JP2008271709A (en) * 2007-04-20 2008-11-06 Toshiba Consumer Electronics Holdings Corp Power conversion apparatus
JP2009011037A (en) * 2007-06-27 2009-01-15 Omron Corp Islanding detection method, controller, islanding detector, and distributed power supply system
DE102014110472A1 (en) 2013-07-25 2015-03-12 Daihen Corporation A method of controlling devices provided with a communication function and apparatus used in the execution of the method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007252128A (en) * 2006-03-17 2007-09-27 Fuji Electric Systems Co Ltd Independent operation detection device for synchronous generator having power system stabilizing function
JP2007252127A (en) * 2006-03-17 2007-09-27 Fuji Electric Systems Co Ltd Independent operation detection device for synchronous generator
JP4631763B2 (en) * 2006-03-17 2011-02-16 富士電機システムズ株式会社 Isolated operation detector for synchronous generator with power system stabilization function
JP4631762B2 (en) * 2006-03-17 2011-02-16 富士電機システムズ株式会社 Single operation detector for synchronous generator
JP2008259400A (en) * 2007-03-09 2008-10-23 Omron Corp Independent operation detection method, controller for detecting independent operation of distributed power supply, independent operation detection device, and distributed power supply system
JP4656131B2 (en) * 2007-03-09 2011-03-23 オムロン株式会社 Isolated operation detection method, distributed power supply isolated operation detection control device, isolated operation detection device, and distributed power supply system
JP2008271709A (en) * 2007-04-20 2008-11-06 Toshiba Consumer Electronics Holdings Corp Power conversion apparatus
JP2009011037A (en) * 2007-06-27 2009-01-15 Omron Corp Islanding detection method, controller, islanding detector, and distributed power supply system
DE102014110472A1 (en) 2013-07-25 2015-03-12 Daihen Corporation A method of controlling devices provided with a communication function and apparatus used in the execution of the method

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