JPH08237865A

JPH08237865A - Power system stabilizer

Info

Publication number: JPH08237865A
Application number: JP7333016A
Authority: JP
Inventors: Hiroo Konishi; 博雄小西; Masahiko Amano; 雅彦天野; Masahiro Watanabe; 雅浩渡辺; Masashi Nishimura; 正志西村
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 1994-12-22
Filing date: 1995-12-21
Publication date: 1996-09-13

Abstract

PURPOSE: To suppress the system oscillation of a power system and to improve the transmission capacity of the system by controlling a semiconductor switch in response to the power state of the system. CONSTITUTION: In a power system in which a power plant 10, a load 40 and other power transmission equipment are organically coupled via transmission lines 31, 32 and composed, an energy control type power system stabilizer having a semiconductor switch at the transmission end of the plant 10 connected via the lines 31, 32 is installed in parallel with the lines 31, 32. The rotatable acceleration or deceleration state of the generator 10 is detected by an acceleration or deceleration detector 102, and the stabilizer 50 is controlled. Thus, the system oscillation of the system can be suppressed, and the normal time transmission power can be transmitted to the full thermal capacities of the lines 31, 32.

Description

Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は電力系統の安定化装
置により、特にパワーエレクトロニクスを適用した系統
安定化装置による既存電力系統の送電能力を向上させる
ための運用方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation method for improving the power transmission capacity of an existing electric power system by a power system stabilizing device, and particularly by a system stabilizing device to which power electronics are applied.

【０００２】[0002]

【従来の技術】電力需要は着実に増加する傾向にあり、
これに対して電源の立地難，送電線の布設難の状況にあ
る。一般に送電線で送ることのできる電力は系統の安定
度上から決まり、送電線の熱容量から決まる送電限界値
の１／２から１／３と小さい。このため、パワエレクト
ロニクス技術を駆使して送電線の熱容量一杯の電力を送
る考えが欧米を中心に検討されている。これが実現され
れば、新たに送電線を布設しなくても送電能力の向上を
図ることができる。例えば、長距離送電線では送電線の
インダクタンスが大きくなるのでインピーダンスの大き
さから定態的に送られる送電限界が決まる。この対策と
して送電線のインダクタンスを打ち消すために送電線に
直列に電力用コンデンサを挿入し、送電線を見かけ上短
くする直列コンデンサ（直コン）補償方法が適用されて
いる。しかし、電力用コンデンサを挿入すると送電線の
インダクタンスと電気的な直列共振現象を生じ、これが
発電機とタービン系の機械的な固有振動数と特定の関係
になると、発電機−タービン系の軸ねじれ現象が発生す
る。特にコンデンサの補償度を高くすると電気的な共振
周波数が低くなり発電機−タービンからなる機械系の固
有振動数に近づくために、軸ねじれ現象が発生しやすく
なる。送電線での送電電力を大きくするためにコンデン
サの補償度を高くしたいが、軸ねじれ現象発生の可能性
が高くなる。このためコンデンサ補償度の低い値で使用
している。2. Description of the Related Art Electricity demand tends to increase steadily,
On the other hand, it is difficult to locate power sources and lay power lines. In general, the electric power that can be sent by a power transmission line is determined by the stability of the system and is as small as 1/2 to 1/3 of the transmission limit value determined by the heat capacity of the transmission line. For this reason, the idea of making full use of power electronics technology to send electric power with the full heat capacity of transmission lines is being studied mainly in Europe and the United States. If this is realized, it is possible to improve the power transmission capacity without installing new transmission lines. For example, in a long-distance power transmission line, the inductance of the power transmission line becomes large, and thus the size of the impedance determines the power transmission limit that can be regularly sent. As a countermeasure, a series capacitor (direct capacitor) compensating method is applied in which a power capacitor is inserted in series with the transmission line to cancel the inductance of the transmission line and the transmission line is apparently shortened. However, when a power capacitor is inserted, an inductance of the transmission line and an electrical series resonance phenomenon occur, and if this has a specific relationship with the mechanical natural frequency of the generator and turbine system, the torsion of the shaft between the generator and turbine system will occur. The phenomenon occurs. In particular, when the degree of compensation of the capacitor is increased, the electrical resonance frequency is lowered and approaches the natural frequency of the mechanical system including the generator-turbine, so that the shaft twist phenomenon is likely to occur. Although it is desirable to increase the degree of compensation of the capacitor in order to increase the amount of power transmitted by the transmission line, the possibility of shaft twisting will increase. Therefore, the capacitor is used with a low compensation value.

【０００３】これに対し、最近の電力用半導体素子の大
容量化実現により、半導体スイッチを適用した電力機器
の高速なスイッチング動作が可能となった。この例とし
て、電力用コンデンサに並列にリアクトルとサイリスタ
を接続し、リアクトルに流れる電流を制御して等価的な
コンデンサ容量を変える試みが検討されている。これを
用いれば電気的な共振点を変えることができるので軸ね
じれを防止することが可能である。発電機−タービン系
の軸ねじれが防止できれば高い補償度で直列コンデンサ
による送電線のインダクタンス補償を行うことができる
ので、新たに送電線を張ることなしに既設送電線を使っ
て送電容量を増加することができることになる。On the other hand, the recent realization of a large capacity semiconductor element for electric power has enabled high-speed switching operation of electric power equipment to which a semiconductor switch is applied. As an example of this, an attempt is being made to connect a reactor and a thyristor in parallel with a power capacitor and control the current flowing through the reactor to change the equivalent capacitor capacity. If this is used, the electrical resonance point can be changed, so that shaft twisting can be prevented. If the shaft twist of the generator-turbine system can be prevented, the inductance of the transmission line can be compensated with a series capacitor with a high degree of compensation, so the transmission capacity can be increased by using the existing transmission line without newly establishing a transmission line. It will be possible.

【０００４】送電線の送電電力Ｐは、送電端の電圧をＶ
ｓ，受電端の電圧をＶｒ，送電線のインピーダンスを
Ｘ，送電端と受電端の電圧の位相差をθと置くと良く知
られているように次式で表される。The transmission power P of the transmission line is the voltage at the transmission end being V
s, the voltage at the power receiving end is Vr, the impedance of the power transmission line is X, and the phase difference between the voltage at the power transmitting end and the voltage at the power receiving end is θ.

【０００５】[0005]

【数１】 [Equation 1]

【０００６】送電線の送電電力を増加するためには、上
式のＰを大きくすれば良い。上記の直列コンデンサ補償
は上式のＸを小さくすることによって送電電力を増加す
るものである。この他、有効電力Ｐそのものを制御する
もの、Ｖｓ，Ｖｒを制御するもの、θを制御するものが
考えられている。例えば、Ｐを制御するものとしては制
動抵抗、Ｖｓ，Ｖｒを制御するものとして無効電力補償
装置，θを制御するものとして移相器がある。しかし、
これらにパワエレクトロニクスを適用し、高速動作させ
ることによって系統安定化を行うことになるが、この系
統安定化装置をどこにおき、どのように使用すれば良い
かについては従来は考えられていなかった。In order to increase the transmission power of the transmission line, it is sufficient to increase P in the above equation. The above series capacitor compensation increases the transmission power by reducing X in the above equation. In addition to this, control of active power P itself, control of Vs and Vr, and control of θ are considered. For example, there is a braking resistance for controlling P, a reactive power compensator for controlling Vs and Vr, and a phase shifter for controlling θ. But,
Power electronics will be applied to these to stabilize the system by operating at high speed, but it has not been conventionally considered where to put this system stabilizing device and how to use it.

【０００７】[0007]

【発明が解決しようとする課題】複数の発電所，負荷、
その他送電機器が送電線によって有機的に結合されて構
成される電力系統の送電能力を向上させるために、半導
体スイッチを備えた電力系統安定化装置を該電力系統安
定化装置の動作特性・機能に応じて電力系統に設置し、
該半導体スイッチを該系統の状態量検出値を使って作ら
れた安定化信号指令に従い制御することによって系統の
安定化を図ると共に、系統動揺の抑制が行える電力系統
安定化装置を提供する。[Problems to be Solved by the Invention]
In order to improve the power transmission capacity of a power system that is configured by organically coupling other power transmission equipment with a power transmission line, a power system stabilizing device equipped with a semiconductor switch is added to the operating characteristics and functions of the power system stabilizing device. Depending on the power system,
Provided is a power system stabilizing device capable of stabilizing a system by controlling the semiconductor switch in accordance with a stabilization signal command created by using a detected state quantity of the system and suppressing system oscillation.

【０００８】[0008]

【課題を解決するための手段】複数の発電所，負荷、そ
の他送電機器が送電線によって有機的に結合されて構成
される電力系統において、該電力系統の送電能力を向上
させるために、半導体スイッチを備えた電力系統安定化
手段を備え、該電力系統安定化手段の動作特性・機能に
応じて電力系統に設置する。また該電力系統安定化手段
の半導体スイッチを該系統の状態量（電圧，電流，電
力，周波数，位相角等）を検出する手段を備え、検出値
から電力系統安定化手段を制御するための安定化信号指
令を作成する手段を備えるようにしたものである。In a power system configured by organically coupling a plurality of power plants, loads, and other power transmission devices, a semiconductor switch is provided to improve the power transmission capability of the power system. The electric power system stabilizing means is provided and is installed in the electric power system according to the operating characteristics and functions of the electric power system stabilizing means. Further, the semiconductor switch of the power system stabilizing means is provided with means for detecting a state quantity (voltage, current, power, frequency, phase angle, etc.) of the system, and a stability for controlling the power system stabilizing means from the detected value. It is provided with a means for creating a conversion signal command.

【０００９】具体的には、複数の発電所，負荷、その他
送電機器が送電線によって有機的に結合されて構成され
る電力系統において、送電線を介して接続された発電所
の発電所送電端に半導体スイッチを備えたエネルギー制
御型の電力系統安定化装置を送電線に並列に設置する。Specifically, in a power system configured by a plurality of power plants, loads, and other power transmission devices being organically coupled by a power transmission line, a power station power transmission end of a power plant connected through the power transmission line. An energy control type power system stabilizer equipped with a semiconductor switch is installed in parallel with the transmission line.

【００１０】そして、１つの又は複数の発電機の回転加
減速状況を検出して、このエネルギー制御型の電力系統
安定化装置を制御するようにする。Then, the rotational acceleration / deceleration status of one or a plurality of generators is detected to control the energy control type power system stabilizing device.

【００１１】また、複数の発電所，負荷、その他送電機
器が送電線によって有機的に結合されて構成される電力
系統において、送電線を介して接続された負荷の負荷接
続点、又は電源と負荷との送電線中間点に系統電圧を制
御する半導体スイッチを備えた電圧制御型の電力系統安
定化装置を送電線に並列に設置する。In a power system constructed by organically coupling a plurality of power plants, loads, and other power transmission equipment to each other through a power transmission line, a load connection point of a load connected via the power transmission line or a power source and a load. A voltage control type power system stabilizing device equipped with a semiconductor switch for controlling the system voltage is installed in parallel with the transmission line at the midpoint of the transmission line.

【００１２】さらに、複数の発電所，負荷、その他送電
機器が送電線によって有機的に結合されて構成される電
力系統において、インピーダンスの大きな送電線を介し
て接続された原子力又は火力発電所の送電線に半導体ス
イッチを備えたインピーダンス制御型又は位相制御型の
電力系統安定化装置を送電線に直列に設置する。設置さ
れた電力系統安定化装置の半導体スイッチは、該系統の
状態量（電圧，電流，電力，周波数，位相角及びこれら
の変化量等）さらには発電機の回転状態の検出値を使っ
て作られた安定化信号指令に従い制御するようにする。Further, in a power system composed of a plurality of power plants, loads, and other power transmission devices that are organically coupled by a power transmission line, the transmission of a nuclear power plant or a thermal power plant connected via a power transmission line having a large impedance. An impedance control type or phase control type power system stabilizing device having a semiconductor switch on an electric wire is installed in series with a transmission line. The installed semiconductor switch of the power system stabilizer is made by using the detected state value of the system (voltage, current, power, frequency, phase angle and their changes) and the detected value of the rotating state of the generator. The control is performed according to the stabilized signal command.

【００１３】以上の系統安定化装置によって系統事故時
の送電安定化を図ることにより、送電線の送電余裕を大
きく取ることなく小さくでき、常時の送電電力を送電線
の熱容量一杯まで送ることが可能となる。By stabilizing the power transmission in the event of a system fault with the system stabilizing device described above, it is possible to reduce the power transmission margin of the power transmission line without taking a large margin, and it is possible to send the constantly transmitted power to the full heat capacity of the power transmission line. Becomes

【００１４】そして、半導体スイッチを高速に制御する
ことにより、事故除去後３サイクル以内に大規模な電力
系統においても系統の電力状態を安定化させることが可
能になる。By controlling the semiconductor switch at high speed, it becomes possible to stabilize the power state of the system even in a large-scale power system within 3 cycles after the accident is eliminated.

【００１５】[0015]

【発明の実施の形態】本発明の一実施例を図１に示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention is shown in FIG.

【００１６】図１は発電所のエネルギーを送電線を介し
て負荷地に送電する送電形態に、エネルギー制御型の電
力系統安定化装置を発電所送電端に設置した場合を示
す。図番号に従って実施例を説明すると、１０は発電
機、２０は昇圧用変圧器、３１，３２は発電機を含む負
荷系統４０に電力を送電する送電線、５０は発電所送電
端に接続されるエネルギー制御型の電力系統安定化装置
の一つである可変速フライホイール発電機で、可変速フ
ライホイール発電機を系統に連系する変圧器５１，可変
速運転を行う発電機５２，発電機のフライホイール５２
１，発電機の回転子の界磁巻線を交流励磁するための電
流を供給する変圧器５３，発電機の界磁巻線５４、及び
界磁巻線を交流励磁するために商用周波の交流を新たな
周波数の交流に変換するサイクロコンバータ５４２で構
成される。５４１はサイクロコンバータ５４２を制御す
るための制御回路、１０１は発電機の回転速度を検出す
るパイロットジェネレータ、１０２は回転速度検出値か
ら発電機の加速，減速を検出する加減速検出回路であ
る。FIG. 1 shows a case in which an energy control type power system stabilizing device is installed at a power transmission end of a power plant in a power transmission form in which energy of a power plant is transmitted to a load place through a power transmission line. An embodiment will be described with reference to the drawing numbers. 10 is a generator, 20 is a step-up transformer, 31 and 32 are power transmission lines that transmit power to a load system 40 including a generator, and 50 is connected to a power transmission end of a power plant. A variable speed flywheel generator that is one of energy control type power system stabilizers, including a transformer 51 that connects the variable speed flywheel generator to the system, a generator 52 that performs variable speed operation, and a generator. Flywheel 52
1, a transformer 53 that supplies a current for AC-exciting a field winding of a rotor of a generator, a field winding 54 of a generator, and an AC of commercial frequency for AC-exciting the field winding Is composed of a cycloconverter 542 for converting the AC into a new frequency AC. Reference numeral 541 is a control circuit for controlling the cycloconverter 542, 101 is a pilot generator for detecting the rotation speed of the generator, and 102 is an acceleration / deceleration detection circuit for detecting acceleration / deceleration of the generator from the detected rotation speed value.

【００１７】この制御回路の動作を図３を用いて説明す
る。The operation of this control circuit will be described with reference to FIG.

【００１８】図３は図１の送電線３１と、または３２で
地絡事故が発生したときの発電所送電端の交流電圧Ｖａ
ｃ，発電機出力Ｐｇ，エネルギー充放電信号Ａ／Ｄ、及
び無効電力制御信号Ｑを示す。系統に事故が起きている
期間、例えば地絡事故発生期間のＴｆ中は、発電所送電
端の電圧が零となるので発電機出力も零となる。このた
め発電機は機械入力が電気出力より勝り加速する。地絡
事故が除去されると交流電圧が系統特性に従って回復す
る。電圧が回復すると発電機の出力も大きくなり、事故
期間中余ったエネルギーを系統に吐き出すように動作
し、系統が安定な場合は発電機出力は振動しながら新し
い定常状態に落ち着く。FIG. 3 shows the AC voltage Va at the power transmission end of the power plant when a ground fault occurs on the power transmission line 31 or 32 of FIG.
c, generator output Pg, energy charge / discharge signal A / D, and reactive power control signal Q. During a period when an accident occurs in the system, for example, during Tf during a ground fault accident period, the voltage at the transmission end of the power plant becomes zero, so the generator output also becomes zero. This causes the generator to accelerate with mechanical input over electrical output. When the ground fault is removed, the AC voltage recovers according to the system characteristics. When the voltage recovers, the output of the generator also increases, and it operates so as to discharge excess energy to the grid during the accident period. When the grid is stable, the generator output oscillates and settles in a new steady state.

【００１９】このような場合、発電所送電端に接続され
た可変速フライホイール発電機は発電機１０が加速して
いるときは交流系統からエネルギーを吸収し、減速して
いるときは吐き出す動作をさせることにより、該送電形
態の過渡安定度を向上させることができる。発電機の加
速減速を検出する為に図１中にパイロットジェネレータ
１０１と加減速検出回路１０２が備わっている。パイロ
ットジェネレータは回転数に比例した電圧を出力し、加
減速検出回路はこの電圧の時間的変化である微分値を取
る構成となっている。微分値を取った結果から図３のエ
ネルギー充放電信号Ａ／Ｄで示す信号が得られる。Ａ／
Ｄ信号が正のとき、即ち発電機が加速しているときは可
変速フライホイール発電機でエネルギーの吸収を行い、
負のとき、即ち発電機が減速しているとき吐き出し動作
を行わせる。この信号に従って可変速フライホイール発
電機は系統とエネルギーのやりとりを行う。この動作は
サイクロコンバータ５４２の点弧角を制御することによ
って実現される。サイクロコンバータの交流励磁電圧の
周波数を高くして可変速フライホイール発電機の出力交
流電圧を系統の電圧位相よりも進めれば可変速フライホ
イールから系統へエネルギーが流れ、逆に遅らせると系
統のエネルギーを吸収することができる。In such a case, the variable speed flywheel generator connected to the transmission end of the power plant absorbs energy from the AC system when the generator 10 is accelerating and discharges it when decelerating. By doing so, the transient stability of the power transmission form can be improved. In order to detect the acceleration / deceleration of the generator, a pilot generator 101 and an acceleration / deceleration detection circuit 102 are provided in FIG. The pilot generator outputs a voltage proportional to the rotation speed, and the acceleration / deceleration detection circuit takes a differential value which is a temporal change of this voltage. From the result of taking the differential value, the signal shown by the energy charge / discharge signal A / D in FIG. 3 is obtained. A /
When the D signal is positive, that is, when the generator is accelerating, the variable speed flywheel generator absorbs energy,
When it is negative, that is, when the generator is decelerating, the discharge operation is performed. According to this signal, the variable speed flywheel generator exchanges energy with the grid. This operation is realized by controlling the firing angle of the cycloconverter 542. If the frequency of the AC excitation voltage of the cycloconverter is increased and the output AC voltage of the variable speed flywheel generator is advanced beyond the voltage phase of the system, energy will flow from the variable speed flywheel to the system, and if delayed, the system energy will be delayed. Can be absorbed.

【００２０】以上では可変速フライホイール発電機のエ
ネルギーの吸収，吐き出しを１，０即ちオン・オフで説
明したが、勿論、加減速検出回路１０２で検出された微
分値の大きさに比例させて可変速フライホイール発電機
の吸収，放出するエネルギーの大きさを変えることもで
きる。また、可変速フライホイール発電機の交流励磁を
サイクロコンバータで行う構成で説明したが、これを自
己消弧機能を持ったＧＴＯ(Gate Turn−off Thyristo
r）とかＩＧＢＴ(Insulated Gate−turn−offBipolar T
ransistor）と言った素子を使ったインバータで構成す
ることもできる。さらに、発電機の加減速検出は発電機
の軸に取り付けられたパイロットジェネレータ１０１で
行う構成を取っている。これは該系統安定化装置が発電
所に設置され、発電機の回転状態信号を使用するためで
ある。勿論、交流母線の電圧や電流の検出値から発電機
の加減速相当を表わす信号を検出することもできるが、
この場合は信号のＳ／Ｎ比が問題となるばかりでなく、
系統事故時に交流電圧や電流波形が乱れるので、うまく
発電機の加減速を検出できないと言った問題がある。こ
れに対し、本発明では発電所またはその近くに系統安定
化装置が設置されることから、発電機−タービン軸の回
転数を光により検出する光センサー等の出力から発電機
の加減速を検出することもできる。この場合はパイロッ
トジェネレータで検出するのと同様に、交流系統から独
立して検出しているのでＳ／Ｎ比とか系統事故により検
出が難しくなると言った問題は生じない。In the above, the absorption and discharge of energy of the variable speed flywheel generator are explained as 1, 0, that is, on / off, but of course, in proportion to the magnitude of the differential value detected by the acceleration / deceleration detection circuit 102. It is also possible to change the amount of energy absorbed and emitted by the variable speed flywheel generator. Also, the AC excitation of the variable speed flywheel generator has been explained by a cycloconverter, but this has been explained by a GTO (Gate Turn-off Thyristo) with a self-extinguishing function.
r) or IGBT (Insulated Gate-turn-off Bipolar T
ransistor) can also be configured with an inverter using the element. Further, the acceleration / deceleration of the generator is detected by the pilot generator 101 attached to the shaft of the generator. This is because the system stabilizer is installed in the power plant and uses the rotation state signal of the generator. Of course, it is also possible to detect a signal representing the acceleration / deceleration equivalent of the generator from the detected values of the AC bus voltage and current.
In this case, not only is the signal S / N ratio a problem, but
There is a problem that the acceleration / deceleration of the generator cannot be detected well because the AC voltage and current waveforms are disturbed during a system fault. On the other hand, in the present invention, since the system stabilizer is installed at or near the power plant, the acceleration / deceleration of the generator is detected from the output of an optical sensor or the like that detects the rotation speed of the generator-turbine shaft by light. You can also do it. In this case, similarly to the detection by the pilot generator, since the detection is performed independently of the AC system, there is no problem that the detection becomes difficult due to the S / N ratio or a system fault.

【００２１】以上図１の構成では系統安定化装置はエネ
ルギー制御を行うことで系統安定化を図ることを説明し
たが、系統安定化装置でエネルギー（有効電力）のほか
に無効電力制御を行う機能を備えたもの、例えば上述の
フライホイール発電機や超電導エネルギー蓄積装置（Ｓ
ＭＥＳ）では、有効電力の制御にあわせて無効電力の制
御を行うことにより系統安定化の効果を一層増すことが
できる。制御の方法は、図３に示した交流電圧の大きさ
を無効電力制御により一定に保つようにする。即ち系統
安定化装置から系統にエネルギーを吐き出すときは系統
の電圧が高くなるので、系統安定化装置で遅れの無効電
力を出して系統の電圧を低くし、エネルギーを吸収する
ときは系統電圧が低くなるので進みの無効電力を出して
系統の電圧を高める動作をさせる。これにより事故時の
系統の安定化を一層高めることができる。In the configuration shown in FIG. 1, it has been described that the system stabilizing device achieves system stabilization by performing energy control. However, the system stabilizing device performs reactive power control in addition to energy (active power). Equipped with, for example, the above-mentioned flywheel generator or superconducting energy storage device (S
In MES), the effect of system stabilization can be further increased by controlling the reactive power in accordance with the control of the active power. As a control method, the magnitude of the AC voltage shown in FIG. 3 is kept constant by reactive power control. That is, when the energy is discharged from the system stabilizer to the system, the system voltage becomes high, so the system stabilizer outputs delayed reactive power to lower the system voltage, and when absorbing energy, the system voltage becomes low. Therefore, the reactive power is advanced and the system voltage is increased. This can further improve the stability of the system in the event of an accident.

【００２２】このように系統事故時にも発電所送電端に
設置したエネルギー制御型電力系統安定化装置により系
統を安定に運用できるので、常時の送電電力を増すこと
ができる。また電力系統安定化装置にパワエレクトロニ
クス（パワエレ）技術を適用することにより、事故除去
後、交流電圧が回復すれば直ちに、または高速に該系統
安定化装置を動作させることができる（事故期間は事故
を検出して遮断器で事故除去されるまで現状約４サイク
ルを考えておけば良く、パワエレを適用した装置では機
械的な操作がないので事故期間内の、例えば３サイクル
以内に動作せることができる）ので、従来の機械式の遮
断器等を用いた系統安定化装置の場合に６サイクル以上
かかるのに比べて系統の安定度をさらに向上させること
ができる。In this way, even in the event of a system failure, the system can be operated stably by the energy control type power system stabilizing device installed at the power transmission end of the power plant, so that it is possible to increase the constantly transmitted power. In addition, by applying power electronics technology to the power system stabilizer, it is possible to operate the system stabilizer immediately or at high speed if the AC voltage is restored after the accident is removed (accident period It suffices to consider about four cycles at present until the circuit breaker detects the accident and the accident is eliminated. Since there is no mechanical operation in the device to which power electronics is applied, it can be operated within the accident period, for example, within three cycles. Therefore, it is possible to further improve the system stability as compared with the conventional system stabilizing device using a mechanical circuit breaker which requires 6 cycles or more.

【００２３】系統安定化装置により系統安定化を行うた
めの制御信号としては、安定化を対象とする発電所，電
源、または負荷の状態量、すなわち電圧，電流，電力，
位相角，角速度，周波数、及びこれらの変化量を使うこ
とができる。The control signals for stabilizing the system by the system stabilizing device include state quantities of the power plant, the power source, or the load targeted for stabilization, that is, voltage, current, power,
The phase angle, angular velocity, frequency, and the amount of change in these can be used.

【００２４】図１のような送電形態においてエネルギー
制御型の電力系統安定化装置が系統安定化に適している
理由は、発電機の出力を送電線で負荷系統に送電するの
で、送電線事故が発生すると発電機のエネルギーの行き
場所が無くなり系統が不安定になる。これを防止するた
めには発電機のエネルギーを吸収，蓄積する機能が必要
であり、これを可能とするのがエネルギー制御型の電力
系統安定化装置であることによる。The reason why the energy control type power system stabilizing device is suitable for system stabilization in the power transmission mode as shown in FIG. 1 is that since the output of the generator is transmitted to the load system by the power transmission line, a power line failure occurs. If it occurs, there will be no place for the generator energy to go, and the system will become unstable. In order to prevent this, it is necessary to have a function of absorbing and accumulating the energy of the generator, and this is possible because of the energy control type power system stabilizer.

【００２５】パワエレ技術を適用したエネルギー制御型
の電力系統安定化装置としては、可変速フライホイール
発電機のほかに、半導体制御の制動抵抗，超電導エネル
ギー貯蔵装置等がある。このうち半導体制御制動抵抗は
エネルギーの吸収は行えるが放出は行えないことに注意
する必要があるが、系統安定化としての効果は同様に期
待できる。Examples of energy control type power system stabilizers to which power electronics technology is applied include a variable speed flywheel generator, a semiconductor-controlled braking resistor, and a superconducting energy storage device. It should be noted that the semiconductor-controlled braking resistor can absorb energy but cannot release it, but the effect of stabilizing the system can be expected as well.

【００２６】系統安定化装置は発電機の出力端子に接続
することもできるが、送電端の交流母線に接続するのが
好都合である。これは発電所に発電機が複数台接続され
て構成される場合、複数台の発電機のエネルギー授受を
一台の系統安定化装置で行うことができるためである。
この系統構成例を図２に示す。図１と同じ番号のものは
同じ機能を表わすので異なった番号のものについて説明
する。１１，１２は発電機、２１，２２は昇圧用変圧
器、１０１１，１０１２はパルスジェネレータで各々発
電機１１及び１２の回転速度を検出する。１０２１，１
０２２は回転速度検出値から発電機の加減速を検出する
加減速検出回路、５４１０は加減速検出値のうちの振幅
の最大値を検出する最大値検出回路である。動作は図１
で説明した装置１０２と同じであるが、エネルギーの吸
収吐き出しを各発電機から検出された加減速検出値の振
幅の最大値で動作させる点が異なる。即ち、加速の最も
大きな発電機にあわせて系統安定化装置で発電機のエネ
ルギーを吸収し、減速の最も大きな発電機にあわせてエ
ネルギーの吐き出しを行う。このような動作により複数
台接続された発電機からなる系統の安定化を一台の系統
安定化装置で安定化できる。複数台の発電機のうち加減
速の最も大きな発電機に合わせてエネルギーの入出力を
行うのは、系統の安定度が位相角の開きの最も大きな発
電機、すなわち加減速の最も大きい発電機に依存して決
まるためである。一般に小さい容量の発電機がこれに該
当することになるが、小さい発電機は大きな発電機に合
わせた動きとなるので、同じ容量の発電機が複数台接続
されて構成される場合がこの場合の対象となる。The system stabilizer can be connected to the output terminal of the generator, but it is convenient to connect it to the AC bus at the power transmission end. This is because when a plurality of generators are connected to the power plant, energy transfer between the plurality of generators can be performed by one system stabilizer.
An example of this system configuration is shown in FIG. The same numbers as those in FIG. 1 indicate the same functions, and therefore different numbers will be described. Reference numerals 11 and 12 are generators, 21 and 22 are boosting transformers, and 1011 and 1012 are pulse generators, which detect the rotation speeds of the generators 11 and 12, respectively. 1021,1
Reference numeral 022 is an acceleration / deceleration detection circuit that detects the acceleration / deceleration of the generator from the rotation speed detection value, and 5410 is a maximum value detection circuit that detects the maximum amplitude value of the acceleration / deceleration detection values. The operation is shown in Figure 1.
The device 102 is the same as the device 102 described above, except that the energy absorption / exhaust is operated at the maximum value of the amplitude of the acceleration / deceleration detection value detected from each generator. That is, the energy of the generator is absorbed by the system stabilizing device according to the generator with the largest acceleration, and the energy is discharged according to the generator with the largest deceleration. By such an operation, it is possible to stabilize the system including a plurality of generators connected by one system stabilizing device. Energy is input and output according to the generator with the largest acceleration / deceleration among the multiple generators because the system stability is the generator with the largest phase angle difference, that is, the generator with the largest acceleration / deceleration. This is because it depends on each other. Generally, a small-capacity generator corresponds to this, but since a small generator works according to a large generator, a case where multiple generators with the same capacity are connected is configured in this case. Be the target.

【００２７】電力系統安定化装置の容量は、送電系統の
過渡安定度から決まる容量が一般に常時の送電可能電力
容量であり、一方、送電線によって送れる電力は定態安
定度から決まる値である。従って定態安定度一杯まで送
電電力を増加しようとすると、定態安定度から決まる電
力から過渡安定度で決まる電力を引いた値以上の電力容
量が電力系統安定化装置の設備容量として必要となる。
一般に送電線で系統安定化装置により送電電力を増加し
ようとする場合は、増加電力以上の電力容量設備とする
必要がある。Regarding the capacity of the power system stabilizing device, the capacity determined by the transient stability of the power transmission system is generally the always-transmittable power capacity, while the power transmitted by the power transmission line is a value determined by the steady state stability. Therefore, if it is attempted to increase the transmission power to the full extent of the steady state stability, a power capacity equal to or more than the value obtained by subtracting the power determined by the transient stability from the power determined by the steady state stability is required as the installed capacity of the power system stabilizer. .
Generally, when it is attempted to increase the transmission power by a system stabilizing device in a transmission line, it is necessary to use a power capacity facility that is equal to or greater than the increased power.

【００２８】本発明のもう１つの実施例を図４に示す。
図４は電源を含む負荷系統を送電線で結んで構成される
送電形態に、系統電圧を制御する電圧型の電力系統安定
化装置、ここでは静止形無効電力補償装置を負荷系統接
続点に設置した場合を示す。図番号に従って説明する
と、４１，４２は電源を含む負荷系統、３３，３４は送
電線、６０は電圧制御型の電力系統安定化装置の一例を
示す静止形無効電力補償装置（ＳＶＣ）を示し、系統か
ら進み電力を取る電力用のコンデンサ６１，系統から遅
れ電力を取るリアクトル６３の電流を位相制御するサイ
リスタ変換器６２から構成される。６０１は負荷系統接
続点の電圧を検出する電圧変成器、６０２は検出された
電圧が規定値よりも高いか低いかを判定し、高い場合は
リアクトル６３に流れる電流を増すように、低い場合は
減らすように指令を出して負荷系統接続点の電圧を規定
の電圧範囲に維持するための点弧指令を作る制御指令作
成回路、６０３はサイリスタ変換器のパルス制御回路で
ある。Another embodiment of the present invention is shown in FIG.
Fig. 4 shows a power transmission system configured by connecting a load system including a power supply with a transmission line, and a voltage type power system stabilizing device for controlling the system voltage, here, a static var compensator is installed at the load system connection point. The case is shown. Describing according to the figure numbers, 41 and 42 are load systems including a power source, 33 and 34 are power transmission lines, and 60 is a static var compensator (SVC) showing an example of a voltage control type power system stabilizing device, It is composed of a power capacitor 61 that takes the lead power from the grid and a thyristor converter 62 that controls the phase of the current of the reactor 63 that takes the delay power from the grid. Reference numeral 601 denotes a voltage transformer that detects the voltage at the connection point of the load system, and 602 determines whether the detected voltage is higher or lower than a specified value. When the voltage is high, the current flowing through the reactor 63 is increased. Reference numeral 603 denotes a pulse control circuit for the thyristor converter, which issues a command to reduce the load command and creates an ignition command for maintaining the voltage at the connection point of the load system within the specified voltage range.

【００２９】この動作を前図の図３を用いて説明する。
送電線３３、または３４で地絡事故が発生した場合を考
える。負荷系統接続点Ｌの電圧をＶａｃとする。この電
圧が規定値（点線）より低いときは進みの無効電力、高
いときは遅れの無効電力となるように制御指令を制御指
令作成回路６０２で作成する。この作成した結果を図３
中の無効電力制御信号Ｑに示す。Ｑの上側を進み無効電
力，下側を遅れ無効電力で表わす。進み・遅れの無効電
力はサイリスタ変換器の点弧角を制御して、リアクトル
の電流を制御することにより行える。すなわち、進み無
効電力を発生させるときは、リアクトル６３の電流を小
さくするために点弧角を遅らせ、遅れ無効電力を発生さ
せるときは、リアクトル６３の電流を大きくするために
点弧角を進ませることによって行える。図３のＱに示す
様に無効電力をバングバング制御する。勿論、系統の電
圧が規定値よりも高いか低いかの大きさに比例させて無
効電力を制御することも可能であり、これによって系統
の電圧安定性を改善できるので、送電線３３，３４によ
る常時の送電電力を大きくできる。また電力系統安定化
装置にパワエレクトロニクス（パワエレ）技術を適用す
ることにより、事故除去後交流電圧が回復すれば直ち
に、または高速に該系統安定化装置を動作させることが
できる（例えば３サイクル以内に動作せることができ
る）ので、従来の機械式の遮断器等を用いた系統安定化
装置の場合６サイクル以上必要なのに比べて系統の安定
度さらに向上させることができる。This operation will be described with reference to FIG. 3 in the previous figure.
Consider a case where a ground fault occurs on the power transmission line 33 or 34. The voltage at the load system connection point L is Vac. When the voltage is lower than the specified value (dotted line), the control command generation circuit 602 generates a control command so that the reactive power is advanced when the voltage is high and the reactive power is delayed when the voltage is high. The result of this creation is shown in Figure 3.
It is shown in the reactive power control signal Q inside. The upper side of Q is shown as reactive power, and the lower side is shown as delayed reactive power. Leading and lagging reactive power can be achieved by controlling the firing angle of the thyristor converter and controlling the reactor current. That is, when the advanced reactive power is generated, the ignition angle is delayed to reduce the current of the reactor 63, and when the delayed reactive power is generated, the ignition angle is advanced to increase the current of the reactor 63. It can be done by As shown in Q of FIG. 3, the reactive power is bang-bang controlled. Of course, it is also possible to control the reactive power in proportion to the magnitude of whether the system voltage is higher or lower than the specified value, which can improve the voltage stability of the system. The power transmitted at all times can be increased. Further, by applying power electronics (power electronics) technology to the power system stabilizing device, the system stabilizing device can be operated immediately or at high speed when the AC voltage is recovered after the accident is removed (for example, within 3 cycles). Since it can be operated), it is possible to further improve the system stability as compared with the case where the conventional system stabilizer using a mechanical circuit breaker requires 6 cycles or more.

【００３０】図４に示した送電形態で電圧制御型の電力
系統安定化装置が系統安定化に有効となる理由は、図４
の系統では送電線の事故によって図１のように発電機の
エネルギーの行き場所が無くなって発電機が脱調すると
言った系統ではなく、送電線の電圧を維持することによ
って送電線で結ばれた２つの負荷系統の安定度が向上す
る系統構成となっているからである。The reason why the voltage control type power system stabilizing device in the power transmission form shown in FIG. 4 is effective for system stabilization is shown in FIG.
In this system, the power line was connected by maintaining the voltage of the transmission line instead of the system in which the generator's energy goes out and the generator goes out of step due to an accident in the transmission line as shown in Fig. 1. This is because the system configuration has improved stability of the two load systems.

【００３１】パワエレ技術を適用した電圧制御型の電力
系統安定化装置としては、上述したＳＶＣのほかに自励
式無効電力補償装置（ＳＶＧ）サイリスタ制御並列コン
デンサ（ＴＳＣ）等を用いることができる。As the voltage control type power system stabilizing device to which the power electronics technology is applied, a self-excited reactive power compensator (SVG) thyristor controlled parallel capacitor (TSC) or the like can be used in addition to the above-mentioned SVC.

【００３２】図５に本発明の変形例を示す。図５では負
荷系統４２につながる交流母線に系統安定化装置６０を
接続したが、ここではもう１つの負荷系統４１の交流母
線に系統安定化装置を接続し、入力の制御信号は負荷系
統４２の交流母線（負荷系統接続点）から得る構成とな
っている。動作は図４の場合と同様である。負荷系統４
２の電圧安定化には送電線３３，３４のインピーダンス
を介して電圧制御することになるので図３に比べて制御
効果が小さくなる。しかし、この構成は系統安定化装置
６０が負荷系統４２の交流母線に設置するに十分の敷地
が取れないと言った場合や、負荷系統４１の安定化にも
使いたいと言った場合に応用できる。後者の場合を考
え、図５では負荷系統４１からの信号に応じて動作させ
ることもできる様になっている。図４と同じ番号のもの
は同じ機能を表わすので、異なったものについて説明す
る。６２１は負荷系統４１の交流母線電圧（負荷系統接
続点電圧）を検出する電圧変成器、６２４は検出された
電圧が規定値よりも高いか低いかを判定し、負荷系統接
続点の電圧を規定の電圧範囲に維持するための点弧指令
を作る制御指令作成回路、６０４は切替回路である。図
示していない指令回路からの信号Ｓに応じてパルス制御
回路６０３に入力する信号を６０２または624ヘ切替え
る。動作は前述と同じであり、制御指令作成回路の入力
信号のみが異なっている。この構成によって負荷系統４
１と４２いずれの系統の電圧安定化も図ることができ
る。また図１に示した系統安定化装置でエネルギー制御
機能のほかに電圧制御機能も備えた系統安定化装置、例
えばフライホイール発電機のごとくエネルギー（有効電
力）制御と無効電力（電圧）制御が可能な装置では、図
５に示した構成とすることによって負荷系統の電圧制御
を行うことによって負荷系統の電圧安定化も可能とな
る。このような系統安定化装置では一般に有効電力と無
効電力を独立に制御することが可能であり、有効電力制
御は図１の制御構成，無効電力制御は図１４の負荷系統
の電圧制御信号により制御されるようになる。FIG. 5 shows a modification of the present invention. In FIG. 5, the system stabilizer 60 is connected to the AC bus connected to the load system 42, but here, the system stabilizer is connected to the AC bus of the other load system 41, and the input control signal is the load system 42. The configuration is obtained from the AC bus (connection point of the load system). The operation is similar to that of FIG. Load system 4
In order to stabilize the voltage of No. 2, the voltage is controlled via the impedance of the power transmission lines 33 and 34, so the control effect becomes smaller than that in FIG. However, this configuration can be applied to the case where the system stabilizing device 60 says that there is not enough site to install on the AC bus of the load system 42, or when it is desired to use it to stabilize the load system 41. . Considering the latter case, in FIG. 5, it is possible to operate in accordance with a signal from the load system 41. Those having the same numbers as those in FIG. 4 represent the same functions, and therefore different components will be described. 621 is a voltage transformer that detects the AC bus voltage (load system connection point voltage) of the load system 41, and 624 determines whether the detected voltage is higher or lower than a specified value, and specifies the voltage at the load system connection point. Reference numeral 604 is a switching command circuit that creates an ignition command for maintaining the voltage range of. A signal input to the pulse control circuit 603 is switched to 602 or 624 according to a signal S from a command circuit (not shown). The operation is the same as the above, and only the input signal of the control command creating circuit is different. With this configuration, the load system 4
It is possible to stabilize the voltage of either system 1 or 42. In addition, the system stabilizer shown in FIG. 1 is capable of controlling energy (active power) and reactive power (voltage) like a flywheel generator, for example, which has a voltage control function in addition to an energy control function. In such a device, the voltage control of the load system can be performed by the configuration shown in FIG. 5 to stabilize the voltage of the load system. In such a system stabilizer, active power and reactive power can generally be controlled independently. Active power control is controlled by the control configuration of FIG. 1 and reactive power control is controlled by the voltage control signal of the load system of FIG. Will be done.

【００３３】この一構成例を図６に示す。前図と同じ記
号のものは同じ機能を表わしている。図において、５５
１はサイクロコンバータの制御回路で、有効電力（エネ
ルギー）出し入れする信号を加減速検出回路１０２の出
力で与え、無効電力制御信号は電圧変成器６０１からの
信号と電圧基準信号Ｖｐとの偏差に基づいて作られる電
圧制御回路（または無効電力制御回路）５５０の出力信
号を指令値としてサイクロコンバータ５４２を動作させ
るパルス信号を作成する。また、代案の制御回路として
はサイクロコンバータを前述のＧＴＯインバータ，ＩＧ
ＢＴインバータに置換した構成であっても達成される。An example of this structure is shown in FIG. The same symbols as in the previous figure represent the same functions. In the figure, 55
Reference numeral 1 is a control circuit of the cycloconverter, which gives a signal for inputting / outputting active power (energy) by the output of the acceleration / deceleration detection circuit 102, and the reactive power control signal is based on the deviation between the signal from the voltage transformer 601 and the voltage reference signal Vp. A pulse signal for operating the cycloconverter 542 is created using the output signal of the voltage control circuit (or reactive power control circuit) 550 created by the above as a command value. Further, as an alternative control circuit, a cycloconverter may be used as the above-mentioned GTO inverter, IG
This can be achieved even if the configuration is replaced with a BT inverter.

【００３４】本発明のもう１つの実施例を図７に示す。
図７は複数の発電所のエネルギーを複数の送電線により
負荷系統（電源と負荷を含む系統）に電力を送る送電形
態に、インピーダンス制御型または位相制御型の電力系
統安定化装置を送電線に直列に接続した場合を示す。図
番号に従って説明すると、１１，１２，１３は発電機、
２１，２２，２３は昇圧用変圧器、３５，３６，３７は
送電線、４０は電源を含む負荷系統、７１はインピーダ
ンス制御型（または位相制御型）の電力系統安定化装
置、７２はもう１つのインピーダンス制御型（または位
相制御型）の電力系統安定化装置、７３は複数の発電所
を結ぶ母線の電圧を検出する電圧変成器、７１１，７２
１は各々送電線３６，３７の電流を検出する電流変成
器、７１２は検出された電圧と電流から送電線３６に流
れる電力を検出し、電力の動揺を抑制すると同時に電力
を規定の値に制御する指令値を作成する制御指令回路、
７１３は指令値に基づいて制御パルスを出力する制御回
路、７２２は検出された電圧と電流から送電線３７に流
れる電力を検出し、電力の動揺を抑制すると同時に電力
を規定の値に制御する指令値を作成する制御指令回路、
７１３は指令値に基づいて制御パルスを出力する制御回
路である。Another embodiment of the present invention is shown in FIG.
FIG. 7 shows a power transmission form in which energy from a plurality of power plants is transmitted to a load system (system including a power source and a load) by a plurality of power transmission lines, and an impedance control type or phase control type power system stabilizing device is used for the power transmission lines. The case where they are connected in series is shown. Describing according to the figure numbers, 11, 12, 13 are generators,
21, 22 and 23 are step-up transformers, 35, 36 and 37 are power transmission lines, 40 is a load system including a power source, 71 is an impedance control type (or phase control type) power system stabilizing device, and 72 is another One impedance control type (or phase control type) power system stabilizing device, 73 is a voltage transformer for detecting the voltage of a bus connecting a plurality of power plants, 711, 72
Reference numeral 1 denotes a current transformer that detects the currents of the transmission lines 36 and 37, respectively, and 712 detects the power flowing through the transmission line 36 from the detected voltage and current, and suppresses the fluctuation of the power and at the same time controls the power to a specified value. Control command circuit to create command value to
Reference numeral 713 is a control circuit that outputs a control pulse based on a command value, and 722 is a command that detects the power flowing in the power transmission line 37 from the detected voltage and current and suppresses the fluctuation of the power and at the same time controls the power to a specified value. A control command circuit that creates a value,
A control circuit 713 outputs a control pulse based on the command value.

【００３５】このような送電形態における電力系統安定
化装置の動作を図７に基づいて説明する。３台の発電機
の出力は送電端の共通母線に接続され、３つの送電線で
負荷系統４０に共通母線Ｌを介して接続されて構成され
ている。３本の送電線は送電端と負荷端で共通母線に接
続されていることから、３台の発電機の出力は送電線の
インピーダンスに応じて分流して負荷系統に流れる。こ
れは各発電機から各々１本の送電線で負荷系統に送電す
る系統構成では送電線で事故が発生すると、発電機出力
が送れなくなるのに対し、共通母線で一旦受けこれを３
本の送電線で分けて送ると，送電線の１つが故障しても
故障線路を切り離すことによって発電機の出力を止める
ことなく他の健全な送電線を使って送ることができるか
らである。即ちこのような系統構成とすることにより送
電信頼度を高くできるからである。The operation of the power system stabilizing device in such a power transmission mode will be described with reference to FIG. The outputs of the three generators are connected to a common bus at the power transmission end, and are connected to the load system 40 via the common bus L by the three power transmission lines. Since the three power transmission lines are connected to the common bus at the power transmission end and the load end, the outputs of the three generators are shunted according to the impedance of the power transmission lines and flow into the load system. This is because in the system configuration in which each generator transmits power to the load system by one transmission line, if an accident occurs in the transmission line, the generator output cannot be sent.
This is because, if the transmission lines are divided and sent, even if one of the transmission lines fails, the faulty line can be cut off to stop the output of the generator and use another healthy transmission line. That is, with such a system configuration, the reliability of power transmission can be increased.

【００３６】このような系統構成において、今、送電線
３５のインピーダンスが系統構成の変化により他の送電
線より小さくなったと仮定する。送電線の電力はインピ
ーダンスの小さい送電線３５に集中して流れ、該送電線
が過負荷となる。この時、電力系統安定化装置７１と７
２がインピーダンス制御型であれば、送電線３６，３７
のインピーダンスを下げる動作をし、流れる電力を増加
させるように機能する。前述した数式１から明らかなよ
うに、送電線のインピーダンスＸが小さくなると送電電
力が増加し、これにより送電線３５の過負荷を解消でき
る。実施例では複数の発電所から３本の送電線３５，３
６，３７により負荷系統に電力を送る構成であるので、
２本の送電線の電力を制御することにより残りの送電線
の電力は一義的に決まることになるので３本ともにイン
ピーダンス制御型の電力系統安定化装置を設置する必要
はない。In such a system configuration, it is now assumed that the impedance of the power transmission line 35 becomes smaller than that of the other transmission lines due to the change in the system configuration. The electric power of the power transmission line concentrates on the power transmission line 35 having a small impedance, and the power transmission line is overloaded. At this time, the power system stabilizers 71 and 7
If 2 is an impedance control type, the transmission lines 36, 37
It works to lower the impedance of and to increase the flowing power. As is clear from Equation 1 described above, the transmission power increases as the impedance X of the power transmission line decreases, and thus the overload of the power transmission line 35 can be eliminated. In the embodiment, three power transmission lines 35, 3 from a plurality of power plants
Since it is configured to send power to the load system by 6, 37,
By controlling the power of the two power transmission lines, the power of the remaining power transmission lines is uniquely determined, so that it is not necessary to install an impedance control type power system stabilizing device for all three power lines.

【００３７】また、負荷系統４０で系統事故が発生し送
電線３５，３６，３７に電力動揺が生じたと仮定する。
この場合、送電線３６，３７の電力動揺を抑制するよう
に指令値作成回路７１２，７２２で動揺を抑制するため
の制御指令値を作成する。電力系統安定化装置では電力
動揺を抑制するように送電線のインピーダンスを変えて
送電電力の値を変えることにより電力の動揺を抑制す
る。Further, it is assumed that a system fault has occurred in the load system 40 and power fluctuations have occurred in the power transmission lines 35, 36 and 37.
In this case, the command value creation circuits 712 and 722 create the control command values for suppressing the fluctuations of the power transmission lines 36, 37 so as to suppress the fluctuations of the electric power. The power system stabilizer suppresses power fluctuations by changing the impedance of the power transmission line and changing the value of the transmitted power so as to suppress power fluctuations.

【００３８】インピーダンス制御型の系統安定化装置は
送電線のインピーダンスを小さくする（補償する）こと
ができるので、長距離送電線等、特にインピーダンスの
大きな送電線に適用すると効果があることは明らかであ
る。Since the impedance control system stabilizer can reduce (compensate) the impedance of the power transmission line, it is clear that it is effective when applied to a long-distance power transmission line or the like, particularly a power transmission line with a large impedance. is there.

【００３９】一方、電力系統安定化装置７１と７２が位
相制御型の場合には、数式１から明らかなように、発電
所側の位相を負荷系統に対して移相させることによって
送電線に流れる電力を変えることができ、位相量を上記
と同様の制御指令値に従って制御することによりインピ
ーダンス制御型と同様な効果を出すことができる。On the other hand, in the case where the power system stabilizing devices 71 and 72 are of the phase control type, as apparent from the formula 1, the phase on the power plant side is shifted to the load system to flow to the power transmission line. The power can be changed, and the same effect as the impedance control type can be obtained by controlling the phase amount according to the same control command value as above.

【００４０】図８にインピーダンス制御型または位相制
御型の電力系統安定化装置で発電機の動揺を安定化し、
系統の送電電力を従来よりも増加させることが可能とな
る系統構成例を示す。前図と同じ番号のものは同じ機能
を示している。１０１１〜１０１３は発電機の軸に取り
付けられた発電機の回転数を検出するパイロットジェネ
レータ、１０２１〜１０２３は検出された回転数から発
電機の加速／減速を検出する加減速検出回路、５４１１
〜５４１３は加減速検出回路１０２１〜1023の信号に従
ってインピーダンス制御型（または位相制御型）電力系
統安定化装置７１〜７３に制御指令を出す制御指令作成
回路、７１３１〜７１３３は指令値に基づいて制御パル
スを出力するパルス制御回路である。この動作は図２で
説明したのと同様で、発電機が加速しているときはイン
ピーダンス制御型（または位相制御型）電力系統安定化
装置７１により送電線のインピーダンスを下げて（送電
線の位相角を大きくして）発電機出力を系統に吸い込ま
せる動作をさせ、減速しているときは送電線のインピー
ダンスを大きくして（送電線の位相角を小さくして）発
電機の電力が流れにくくなる様に制御する。FIG. 8 shows an impedance control type or phase control type power system stabilizing device for stabilizing the oscillation of the generator.
An example of a system configuration that makes it possible to increase the transmission power of the system more than before is shown. The same numbers as in the previous figure indicate the same functions. Reference numerals 1011 to 1013 are pilot generators for detecting the rotation speed of a generator mounted on the shaft of the generator, 1021 to 1023 are acceleration / deceleration detection circuits for detecting acceleration / deceleration of the generator from the detected rotation speed, 5411.
5413 are control command generation circuits for issuing control commands to the impedance control type (or phase control type) power system stabilizing devices 71 to 73 according to the signals of the acceleration / deceleration detection circuits 1021 to 1023, and 7131 to 7133 are controlled based on the command values. It is a pulse control circuit that outputs a pulse. This operation is similar to that described in FIG. 2, and when the generator is accelerating, the impedance of the transmission line is lowered by the impedance control type (or phase control type) power system stabilizing device 71 (phase of the transmission line). Make the generator output suck into the system by increasing the angle), and increase the impedance of the transmission line (decrease the phase angle of the transmission line) during deceleration to prevent the generator power from flowing. Control so that

【００４１】この構成により系統事故時にも発電機の動
揺を抑制できるので電力送電の安定化が図れ常時の送電
電力を増した運用が可能となる。With this configuration, the sway of the generator can be suppressed even in the event of a system fault, so that the power transmission can be stabilized and the operation with a constantly increased transmission power can be performed.

【００４２】各発電機の動揺抑制に対応して電力系統安
定化装置を設置して安定化を図る構成としたが、図１に
示した構成で電力系統安定化装置一台で行うことも可能
である。実施例を図９に示す。前図の番号と同じ番号を
付したブロックは同じ機能を示している。この場合の電
力系統安定化装置の安定化に必要な容量は各々の送電線
に入れる場合に比べて装置の制御範囲が大きくなるので
容量も大きくなる。Although the power system stabilizing device is installed to stabilize the power generators in order to suppress the fluctuation of each generator, the power system stabilizing device may be used alone in the configuration shown in FIG. Is. An example is shown in FIG. Blocks with the same numbers as in the previous figure indicate the same functions. In this case, the capacity required for stabilization of the power system stabilizing device is larger because the control range of the device is larger than that in the case where each power transmission line is connected.

【００４３】また、図２の実施例で示したように複数あ
る発電機中から、回転速度の増減の振幅が最も大きい発
電機に合わせて系統が安定になるように制御する。Further, as shown in the embodiment of FIG. 2, control is performed so that the system is stabilized in accordance with the generator having the largest increase / decrease amplitude of the rotation speed among the plurality of generators.

【００４４】この構成でも系統事故時に発電機の動揺を
抑制できるので電力送電の安定化が図れ常時の送電電力
を増した運用が可能となる。Even with this configuration, the sway of the generator can be suppressed at the time of a system fault, so that the power transmission can be stabilized and the operation with the increased transmission power at all times can be performed.

【００４５】図１０に前述したインピーダンス制御型の
電力系統安定化装置の一例を示す。図１０はサイリスタ
制御の直列コンデンサを示す。Ｃは送電線３６に直列に
挿入される直列コンデンサ、Ｌはリアクトル、ＴＨ１，
ＴＨ２はリアクトルの電流を制御するサイリスタスイッ
チで、サイリスタスイッチの点弧位相を制御することに
よってリアクトルに流れる電流を変えることができ、等
価的に直列コンデンサの容量を変えることができる。７
００はサイリスタの点弧パルスを出力する点弧パルス作
成回路で、前述の制御指令回路（例えば７１２）と制御
回路（例えば７１３）から構成される。サイリスタスイ
ッチＴＨ１，ＴＨ２の位相角を制御することによって直
列コンデンサのコンデンサ容量を等価的に変えることが
できるので、送電線３６のインピーダンスを変えること
ができる。FIG. 10 shows an example of the above-mentioned impedance control type power system stabilizing device. FIG. 10 shows a thyristor controlled series capacitor. C is a series capacitor inserted in series in the power transmission line 36, L is a reactor, TH1,
TH2 is a thyristor switch for controlling the current of the reactor. By controlling the ignition phase of the thyristor switch, the current flowing through the reactor can be changed, and the capacitance of the series capacitor can be changed equivalently. 7
Reference numeral 00 is a firing pulse generation circuit for outputting a firing pulse of the thyristor, which is composed of the control command circuit (for example, 712) and the control circuit (for example, 713). By controlling the phase angles of the thyristor switches TH1 and TH2, the capacitance of the series capacitor can be changed equivalently, so that the impedance of the power transmission line 36 can be changed.

【００４６】図１１に位相制御型の電力系統安定化装置
の一例を示す。図１１はサイリスタ制御移相器を表わ
し、７０１は２次側のインバータで発生した電圧を送電
線側の１次側に誘起させ送電線電圧に加算する移相変圧
器、７０２は送電線３６からインバータ７０３の電源を
得るための絶縁用変圧器、７０４はインバータの点弧パ
ルス作成回路で、前述の制御指令回路(例えば７１２)と
制御回路(例えば７１３)から構成される。指令値に従っ
た電圧と位相を持った電圧をインバータによって発生さ
せることにより、送電線発電所端の電圧の位相を移相さ
せることができるので、前述の数式１から明らかなよう
に送電線に流れる電力を制御することができ、電力動揺
も抑制させることができる。FIG. 11 shows an example of a phase control type power system stabilizing device. FIG. 11 shows a thyristor control phase shifter, 701 is a phase shift transformer that induces the voltage generated in the secondary side inverter on the primary side of the transmission line side and adds it to the transmission line voltage, and 702 is from the transmission line 36. An insulating transformer 704 for obtaining the power source of the inverter 703 is an ignition pulse generation circuit of the inverter, which is composed of the control command circuit (for example, 712) and the control circuit (for example, 713). Since the phase of the voltage at the end of the power transmission line power station can be shifted by generating a voltage having a phase according to the command value with an inverter, as is clear from the above-mentioned mathematical formula 1, The flowing electric power can be controlled, and the power fluctuation can be suppressed.

【００４７】本発明のもう１つの実施例を図１２に示
す。図１２は図１の送電形態において、２つ（複数）の
系統安定化装置を設置した場合を示している。この場
合、装置としては機能の異なる系統安定化装置を組み合
わせて設置するのが、系統の送電電力増加の役割分担が
できるので相乗効果による系統安定化効果が期待でき
る。図１および図４と同じ番号のものは同じ機能を示し
ている。今、系統安定化装置７１がインピーダンス制御
型の装置とする。送電線３２で系統事故が発生した場
合、図１の場合と同様に、発電機が加速中はエネルギー
制御型の系統安定化装置５０は発電機のエネルギーを吸
収し、減速中は系統エネルギーを吐き出す動作を制御回
路５４１に行わせる。一方、インピーダンス制御型系統
安定化装置７１は発電機が加速中はインピーダンスを小
さくして発電機のエネルギーを系統に吸収し、減速中は
インピーダンスを高くして発電機の減速を抑える動作を
行うように制御回路７１３で動作させる。発電機の加速
と減速は送電線の電流を検出する電流変成器７４と発電
所母線の電圧を検出する電圧変成器７３から電力を検出
し、検出した電力動揺の時間変化を取ることによって求
まり、この演算動作は指令値作成回路７１２によって行
われる。このように２つの機能の異なる系統安定化装置
が各々動作して、該送電形態での系統事故時の発電機の
動揺を高速に抑制でき系統の安定化を図ることができ
る。図１のエネルギー制御型のみの場合に比べて、イン
ピーダンス制御型の系統安定化装置を追加することによ
って、電力動揺の抑制を早く抑えることが可能であると
同時に、系統安定化装置の装置容量を単体の場合よりも
小さくできる利点がある。Another embodiment of the present invention is shown in FIG. FIG. 12 shows a case where two (plurality) system stabilizing devices are installed in the power transmission form of FIG. In this case, it is expected that a system stabilizing effect due to a synergistic effect can be expected because a system stabilizing device having a different function is installed as a device, because the role of increasing the transmission power of the system can be shared. The same numbers as those in FIGS. 1 and 4 indicate the same functions. Now, it is assumed that the system stabilizing device 71 is an impedance control type device. When a system fault occurs on the power transmission line 32, the energy control type system stabilizing device 50 absorbs the energy of the generator while the generator is accelerating and discharges the system energy during deceleration, as in the case of FIG. 1. The control circuit 541 is caused to perform the operation. On the other hand, the impedance control system stabilizing device 71 reduces the impedance while the generator is accelerating to absorb the energy of the generator in the system, and increases the impedance during deceleration to suppress the deceleration of the generator. Then, the control circuit 713 is operated. Acceleration and deceleration of the generator are obtained by detecting electric power from the current transformer 74 that detects the current of the transmission line and the voltage transformer 73 that detects the voltage of the power plant bus, and take the time variation of the detected power fluctuation. This calculation operation is performed by the command value creation circuit 712. In this way, the system stabilizing devices having two different functions operate, respectively, and the sway of the generator at the time of a system failure in the power transmission mode can be suppressed at high speed, and the system can be stabilized. Compared with the case of only the energy control type of FIG. 1, by adding an impedance control type system stabilizer, it is possible to suppress power fluctuations quickly, and at the same time, increase the capacity of the system stabilizer. There is an advantage that it can be made smaller than a single unit.

【００４８】以上は系統安定化装置７１をインピーダン
ス制御型で説明したが、位相制御型で行っても同様の効
果が期待できる。また図４に示した電圧制御型の系統安
定化装置を負荷系統接続点Ｌに接続した組み合わせも考
えられ、いずれも単体で系統安定化を図る場合に比べて
より大きな系統安定化効果が期待できる。Although the system stabilizing device 71 has been described as the impedance control type in the above, the same effect can be expected if the phase stabilizing type is used. A combination in which the voltage-controlled system stabilizer shown in FIG. 4 is connected to the load system connection point L is also conceivable, and in each case, a greater system stabilizing effect can be expected as compared with the case where the system is independently stabilized. .

【００４９】なお、図１２では系統安定化装置７１は、
送電線３１の一方にのみ設置する場合を示したが、当然
他の回線３２にも設置する必要があることは送電線３１
での系統事故を考えると明らかである。In FIG. 12, the system stabilizing device 71 is
Although the case where it is installed only on one side of the power transmission line 31 is shown, naturally it is necessary to install it on the other line 32 as well.
It is clear considering the system accident at.

【００５０】また機能の異なる系統安定化装置を組み合
わせて設置する同様な実施例は図７にも適用できる。こ
の実施例を図１３に示す。A similar embodiment in which system stabilizing devices having different functions are combined and installed can also be applied to FIG. This embodiment is shown in FIG.

【００５１】図１３はインピーダンス制御型（または位
相制御型）の電力系統安定化装置で送電線の潮流を制御
する図７の機能と発電機の動揺を安定化させる図８の機
能を組み合わせることによって、図７や図８の場合より
も系統の安定化能力を増し、系統の送電電力をさらに増
加させることが可能となる系統構成を示している。前図
と同じ番号のものは同じ機能を示している。１０１１〜
１０１３は発電機の軸に取り付けられた発電機の回転数
を検出するパイロットジェネレータ、１０２１〜１０２
３は検出された回転数から発電機の加速／減速を検出す
る加減速検出回路、５４１０は加減速検出回路１０２１
〜１０２３の出力のうちの振幅の最大値を検出する最大
値検出回路、５４１１は検出された最大振幅値に従って
インピーダンス制御型（または位相制御型）電力系統安
定化装置７１に制御指令を出す制御指令作成回路、７１
３は指令値に基づいて制御パルスを出力する制御回路で
ある。この動作は図２で説明したのと同様で、発電機が
加速しているときはインピーダンス制御型（または位相
制御型）電力系統安定化装置７１により送電線のインピ
ーダンスを下げて（送電線の位相角を大きくして）発電
機出力を系統に吸い込ませる動作をさせ、減速している
ときは送電線のインピーダンスを大きくして（送電線の
位相角を小さくして）発電機の電力が流れにくくなる様
に制御する。もう１つのインピーダンス制御型（または
位相制御型）電力系統安定化装置７２は電力系統安定化
装置７１と役割を分担して系統の安定化を図るのが好都
合であり、このため電力系統安定化装置７２は図７と同
じ動作、即ち送電線の電力潮流を制御する動作をさせる
役目を持たせている。動作は図７で説明したのと同様で
ある。FIG. 13 shows a combination of the function of FIG. 7 for controlling the power flow of the transmission line and the function of FIG. 8 for stabilizing the fluctuation of the generator in the impedance control type (or phase control type) power system stabilizing device. , FIG. 7 and FIG. 8 show a system configuration that makes it possible to increase the system stabilizing capability and further increase the transmission power of the system. The same numbers as in the previous figure indicate the same functions. 1011 ~
Reference numeral 1013 denotes a pilot generator 1021 to 102 for detecting the number of revolutions of the generator attached to the shaft of the generator.
3 is an acceleration / deceleration detection circuit that detects acceleration / deceleration of the generator from the detected rotation speed, and 5410 is an acceleration / deceleration detection circuit 1021.
A maximum value detection circuit for detecting the maximum value of the amplitude of the outputs of 1023, 5411 is a control command for issuing a control command to the impedance control type (or phase control type) power system stabilizing device 71 according to the detected maximum amplitude value. Making circuit, 71
A control circuit 3 outputs a control pulse based on a command value. This operation is similar to that described in FIG. 2, and when the generator is accelerating, the impedance of the transmission line is lowered by the impedance control type (or phase control type) power system stabilizing device 71 (phase of the transmission line). Make the generator output suck into the system by increasing the angle), and increase the impedance of the transmission line (decrease the phase angle of the transmission line) during deceleration to prevent the generator power from flowing. Control so that It is convenient that the other impedance control type (or phase control type) power system stabilizing device 72 shares a role with the power system stabilizing device 71 to stabilize the system. Reference numeral 72 has the role of performing the same operation as in FIG. 7, that is, the operation of controlling the power flow of the transmission line. The operation is similar to that described with reference to FIG.

【００５２】この構成により系統事故時にも電力送電の
安定化が図れ系統がダウンするといったことにはならな
いので常時の送電電力を増した運用が可能となる。With this configuration, even when a system fault occurs, the power transmission is stabilized and the system does not go down, so that it is possible to operate the system with an increased transmission power at all times.

【００５３】[0053]

【発明の効果】このように本発明で示した系統安定化機
器をその特性・機能に応じて電力系統に設置することに
より、新たに送電線を張ることなく既設送電線の送電電
力向上が図れるようになる。As described above, by installing the system stabilizing device shown in the present invention in the power system according to its characteristics and functions, it is possible to improve the transmission power of the existing transmission line without newly establishing a transmission line. Like

[Brief description of drawings]

【図１】本発明のエネルギー制御型系統安定化装置を適
用した実施例。FIG. 1 is an embodiment to which an energy control system stabilizing device of the present invention is applied.

【図２】複数の発電機に対しエネルギー制御型系統安定
化装置を適用した実施例。FIG. 2 is an embodiment in which an energy control system stabilizer is applied to a plurality of generators.

【図３】系統安定化装置の動作を説明するための図。FIG. 3 is a diagram for explaining the operation of the system stabilizing device.

【図４】本発明の電圧制御型系統安定化装置を適用した
実施例。FIG. 4 is an embodiment to which the voltage control system stabilizing device of the present invention is applied.

【図５】電圧制御型系統安定化装置の一実施例。FIG. 5 shows an example of a voltage-controlled system stabilizer.

【図６】エネルギー制御型系統安定化装置を電圧信号に
より制御する実施例。FIG. 6 shows an embodiment in which an energy control system stabilizing device is controlled by a voltage signal.

【図７】本発明のインピーダンス制御型または位相制御
型系統安定化装置を適用した実施例。FIG. 7 is an embodiment to which the impedance control type or phase control type system stabilizing device of the present invention is applied.

【図８】複数の発電機に対しインピーダンス制御型、ま
たは位相制御型系統安定化装置を適用した実施例。FIG. 8 is an embodiment in which an impedance control type or phase control type system stabilizer is applied to a plurality of generators.

【図９】複数の発電機に対しインピーダンス制御型また
は位相制御型系統安定化装置を適用した実施例。FIG. 9 is an embodiment in which an impedance control type or phase control type system stabilizer is applied to a plurality of generators.

【図１０】インピーダンス制御型系統安定化装置の一実
施例を示す図。FIG. 10 is a diagram showing an embodiment of an impedance control system stabilizer.

【図１１】位相制御型系統安定化装置の一実施例を示す
図。FIG. 11 is a diagram showing an embodiment of a phase control system stabilizing device.

【図１２】本発明の複数種類の系統安定化装置を組み合
わせた場合の実施例。FIG. 12 shows an embodiment in which a plurality of types of system stabilizing devices of the present invention are combined.

【図１３】複数の発電機に対しインピーダンス制御型ま
たは位相制御型系統安定化装置を適用した実施例。FIG. 13 is an embodiment in which an impedance control type or phase control type system stabilizing device is applied to a plurality of generators.

[Explanation of symbols]

１０〜１３…発電所、２０〜２３…昇圧用変圧器、３１
〜３７…送電線、４０…負荷系統、５０，６０…系統安
定化装置、５１，５３，７０２…変圧器、５２…可変速
発電機、５４…界磁回路、６１…進み電力補償用コンデ
ンサ、６２…サイリスタ変換器、６３…リアクトル、７
１，７２…系統安定化装置、７３…電圧変成器、１０１
…パイロットジェネレータ、１０２…加減速検出回路、
５２１…フライホイール、５４１，７１３，７２３…制
御回路、５４２…サイクロコンバータ、６０１…電圧変
成器、６０２，７１２，７２２…指令値作成回路、６０
３…制御指令回路、７００，７０４…点弧パルス作成回
路、７０１…移相変圧器、７０３…インバータ、７１
１，７２１…電流変成器。10-13 ... Power plant, 20-23 ... Step-up transformer, 31
... 37 ... Transmission line, 40 ... Load system, 50, 60 ... System stabilizing device, 51, 53, 702 ... Transformer, 52 ... Variable speed generator, 54 ... Field circuit, 61 ... Lead power compensation capacitor, 62 ... Thyristor converter, 63 ... Reactor, 7
1, 72 ... System stabilizing device, 73 ... Voltage transformer, 101
… Pilot generator, 102… Acceleration / deceleration detection circuit,
521 ... Flywheel, 541, 713, 723 ... Control circuit, 542 ... Cycloconverter, 601 ... Voltage transformer, 602, 712, 722 ... Command value creating circuit, 60
3 ... Control command circuit, 700, 704 ... Firing pulse creating circuit, 701 ... Phase shift transformer, 703 ... Inverter, 71
1,721 ... Current transformer.

フロントページの続き (72)発明者西村正志茨城県日立市大みか町七丁目１番１号株式会社日立製作所日立研究所内Front Page Continuation (72) Inventor Masashi Nishimura 7-1-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi Research Laboratory

Claims

[Claims]

1. A power system stabilizing device installed in a power system connecting a generator and a load, wherein the power system stabilizing device includes a semiconductor switch, and the semiconductor switch is provided in accordance with a power state of the power system. A power system stabilizing device, characterized in that it is controlled so as to suppress system sway of the power system.

2. The power system stabilizing device according to claim 1, further comprising an acceleration / deceleration detector for detecting acceleration / deceleration of the generator, wherein the acceleration / deceleration signal of the generator is output from the acceleration / deceleration detector. An electric power system stabilizing device characterized by controlling the semiconductor switch according to the method.

3. The power system stabilizing device according to claim 2, wherein the power system stabilizing device comprises power energy input / output means controlled by the semiconductor switch. Device.

4. The power system stabilizing device according to claim 3, wherein the power system stabilizing device comprises power energy input / output means controlled by the semiconductor switch, and the acceleration maximum of a plurality of generators is provided. Corresponding to the operation of the generator, absorbing the electric energy, corresponding to the operation of the maximum decelerating generator,
An electric power system stabilizer characterized by releasing electric power energy.

5. The power system stabilizing device according to claim 3, wherein the power energy input / output unit is installed in parallel with the power system.

6. The power system stabilizing device according to claim 5, wherein the power energy input / output unit is installed at a power transmission end of the generator.

7. The power system stabilizing device according to claim 6, further comprising a power state detector on the load side from the power transmission end of the generator through the power transmission line, and the power state from the power state detector. A power system stabilizing device, wherein the semiconductor switch is controlled using a signal and an acceleration / deceleration signal of the generator.

8. The power system stabilizing device according to claim 2, wherein the power system stabilizing device comprises impedance control means controlled by the semiconductor switch. .

9. The power system stabilizing device according to claim 8, wherein the acceleration / deceleration detector detects acceleration / deceleration of two or more generators, and the acceleration / deceleration state of the generator having the largest acceleration / deceleration. An electric power system stabilizing device characterized in that the semiconductor switch is controlled in accordance with the above.

10. The power system stabilizing device according to claim 2, wherein the power system stabilizing device comprises phase control means controlled by the semiconductor switch. .

11. The power system stabilizing device according to claim 10, wherein the acceleration / deceleration detector detects acceleration / deceleration of two or more generators, and the acceleration / deceleration state of the generator having the largest acceleration / deceleration. An electric power system stabilizing device characterized in that the semiconductor switch is controlled in accordance with the above.

12. The power system stabilizing device according to claim 2, wherein the power system stabilizing device comprises power energy input / output means controlled by the semiconductor switch and impedance control means. A characteristic power system stabilizer.

13. The power system stabilizing device according to claim 12, wherein the impedance control means is installed in series with the power system, and means for detecting a power state of the power system is provided. A power system stability characterized by controlling the power energy input / output means and the impedance control means with reference to an acceleration / deceleration signal of the generator from the detection means and a power state signal from the power detection means. Device.

14. The power system stabilizing device according to claim 2, wherein the power system stabilizing device comprises power energy input / output means controlled by the semiconductor switch and phase control means. A characteristic power system stabilizer.

15. The power system stabilizing device according to claim 14, wherein the phase control means is installed in series with the power system, and means for detecting a power state of the power system is provided. A power system stability characterized by controlling the power energy input / output means and the impedance control means with reference to an acceleration / deceleration signal of the generator from the detection means and a power state signal from the power detection means. Device.

16. The power system stabilizing device according to claim 1, further comprising a voltage fluctuation detecting means for detecting a voltage fluctuation of the power system, and responding to the voltage fluctuation of the power system from the voltage fluctuation detecting means. A power system stabilizing device characterized by controlling the semiconductor switch.

17. The power system stabilizing device according to claim 16, wherein the power system stabilizing device comprises reactive power control means controlled by the semiconductor switch. apparatus.

18. The power system stabilizing device according to claim 17, wherein the reactive power control means supplies the leading reactive power when the detected voltage from the voltage fluctuation detecting means is lower than a predetermined value, Further, when the detected voltage is higher than a predetermined value, delayed reactive power is supplied to the power system stabilizing device.

19. The power system stabilizing device according to claim 17, wherein the reactive power control means is arranged at a midpoint of a transmission line of the power system, and first voltage fluctuation detecting means is provided at the midpoint of the transmission line. A power system stabilizing device characterized by being provided with.

20. The power system stabilizing device according to claim 19, wherein a second voltage fluctuation detecting means is provided on a power transmission line other than the midpoint of the power transmission line of the power system, and the reactive power control means is the above-mentioned. A power system stabilizing device, wherein a detected voltage signal from first and second voltage fluctuation detecting means is input.

21. The power system stabilizing device according to claim 1, further comprising a transmission power detection unit for detecting transmission power of the power system, wherein the transmission power fluctuation of the power system from the transmission power detection unit is detected. An electric power system stabilizing device characterized by controlling the semiconductor switch according to the method.

22. The power system stabilizing device according to claim 21, wherein the power system stabilizing device comprises impedance control means controlled by the semiconductor switch. .

23. The power system stabilizing device according to claim 22, wherein when there are at least two power lines connecting the generator and the load in parallel, the impedance control means is provided on at least one of the power lines. A power system stabilizing device characterized in that it is provided.

24. The electric power system stabilizing device according to claim 23, wherein the impedance control means is provided for each of the plurality of electric power lines.

25. The power system stabilizing device according to claim 21, wherein the power system stabilizing device comprises phase control means controlled by the semiconductor switch. .

26. The power system stabilizing device according to claim 25, wherein when there are at least two power lines connecting the generator and the load in parallel, the phase control means is provided on at least one of the power lines. A power system stabilizing device characterized in that it is provided.

27. The power system stabilizing device according to claim 26, wherein the phase control means is provided for each of the plurality of power lines.

28. The power system stabilizing device according to claim 1, wherein a cycloconverter is used as the semiconductor switch.

29. The power system stabilizing device according to claim 1, wherein a GTO element is used as the semiconductor switch.

30. The power system stabilizing device according to claim 1, wherein an IGBT element is used as the semiconductor switch.

31. The electric power system according to claim 1, wherein:
An energy control type power system stabilizer equipped with a semiconductor switch was installed in parallel with the transmission line at the power station transmission end of the power plant connected via the transmission line, and a device for detecting acceleration / deceleration of the generator was installed. Provided, absorbs energy during acceleration detection,
A power system stabilizing device, which is configured to stabilize the system by discharging energy during deceleration and to suppress system sway.

32. The electric power system according to claim 1, wherein:
A voltage-controlled power system stabilizer equipped with a semiconductor switch that controls the system voltage at the load connection point of the load connected via the power transmission line or at the transmission line intermediate point between the power source and the load is connected in parallel to the power transmission line. Install a device to detect the voltage at the installation point of the system stabilization device.When the voltage is lower than the specified value, the reactive power of the lead is taken, and when it is high, the reactive power of the delay is taken, and thereby the voltage of the transmission line. The electric power system stabilizing device is characterized in that the electric power system is controlled so as to stabilize the system and suppress the system oscillation.

33. A power system according to claim 1, wherein:
An impedance control type or phase control type power system stabilizing device having a semiconductor switch is connected to at least one of the power transmission lines connected to a plurality of power plants via a bus and connected to a load via a plurality of power transmission lines. It is installed in series with an electric wire, a device for detecting the electric power flowing through the electric power transmission line is provided, and the power flow of the electric power system is controlled by controlling the electric power of the electric power transmission line to a specified value, and system fluctuation is suppressed. A power system stabilizing device characterized in that

34. The electric power system according to claim 1,
A device for detecting acceleration / deceleration of a generator by installing an impedance control type power system stabilizer equipped with semiconductor switches in series with the transmission line of a power plant connected via a transmission line with large impedance. Is provided to absorb energy from the system when acceleration is detected and discharge energy when decelerating to stabilize the system and suppress system oscillation.

35. The electric power system according to claim 1, wherein:
A plurality of power system stabilizers having different functions or roles, such as energy control type, voltage control type, impedance control type, etc., equipped with semiconductor switches are combined and installed on the target transmission line, and the semiconductor switches are used to detect the state quantity of the system. A power system stabilizing device, which controls power flow of a power system by controlling according to a stabilization signal command created by using values and stabilizes the system by suppressing system oscillation.

36. A stabilizing device applied to a power system according to any one of claims 31 to 35, wherein a stabilizing signal produced by using a state quantity detection value of the system within 3 cycles after elimination of the system fault. A power system stabilizing device characterized in that a semiconductor switch is operated in accordance with a command to stabilize the system and suppress system oscillation.

37. The power system according to any one of claims 31 to 36, wherein the stabilizing device capacity of the installed power system is:
The feature is that the capacity is set to be equal to or larger than the difference between the transmission capacity determined by the steady-state stability and the transient stability of the target transmission system.

38. The electric power system according to any one of claims 31 to 36, wherein the stabilizing device capacity of the installed electric power system is
It is characterized in that the device capacity is equal to or larger than the transmission power increase capacity required for the target transmission system.

39. In the electric power system according to any one of claims 31 to 35, the amount of state of the electric power system that generates the stabilization signal command of the control device of the stabilization device for the electric power system to be installed is the target of stabilization. It is characterized in that it is the state quantity of a power plant, power source or load system.