JP2004153940A - Controller for ac excitation type generator motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller for a generator motor which can quickly control the frequency ripple of a power system by making the most of the available rotational energy of an AC excitation type generator motor (hereinafter referred to as a generator motor) to the utmost. <P>SOLUTION: An acceleration/deceleration control signal generator 33 monitors the frequency fg of the voltage of the stator winding of the generator motor 1, and when the frequency fg gets over the specified frequency fζ or when it falls under another specified frequency fη(fη<fζ), it computes the available rotational energy from the number of revolutions and the allowable revolution range of the generator motor at that time, and controls the active power of the generator motor 1 via a q-axis controller 15 and a converter controller 6 thereby controlling the ripple of frequency of the power system. <P>COPYRIGHT: (C)2004,JPO

Description

にて求められる。従って、運転可能回転数の上限値をＮｍａｘとすると、回転数がＮからＮｍａｘまで変化するときの回転エネルギーΔＥは、式（２）にて求まる。

【００２２】
回転エネルギーΔＥはＷ・秒の単位であり、シミュレーション計算などにより決定した加速抑制の制御継続時間をｔとすると、このときの有効電力の可能制御量ΔＰｃは、
ΔＰｃ＝ΔＥ／ｔ （３）
で求まる。有効電力値計算手段３３ｆは、制御継続時間設定手段３３ｅに予め設定された上記制御継続時間ｔと、上記ΔＥとから、上記（３）式に基づきΔＰｃを計算する。
これに基づき、抑制信号生成手段３３ｇにて生成される抑制信号Ｓ６を、このΔＰｃ、ｔの関数による図２の抑制信号生成手段３３ｇの枠内に示すような、一定時間ｔの間有効電力をΔＰだけ減少させる信号とすることにより、交流励磁形発電電動機１を過度に制御することなく運転許容限度内での電力系統の周波数変動抑制制御を実現できる。
【００２３】
具体的には、図１に示すように抑制信号Ｓ６を電力偏差検出器１４に加算することにより、有効電力を低下させる方向に制御し電力系統の加速を抑制する。つまり、電力系統が加速されるのは発電量＞負荷（需要）量の状態であるので、発生有効電力を少なくし、交流励磁形発電電動機１の回転エネルギーとして吸収させることにより、電力系統の周波数の上昇を抑制することができる。
【００２４】
加減速発生時抑制指令信号発信手段３３ａは、交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇが所定の周波数ｆζを超えると、加減速抑制指令信号Ｓ２を発する。加減速抑制指令信号Ｓ２を受けた後、利用可能回転エネルギー計算手段３３ｃ、有効電力値計算手段３３ｆ、抑制信号生成手段３３ｇは上述のように動作し、抑制信号Ｓ６を発信する。
【００２５】
なお、電力系統が減速した場合の制御も、固定子巻線電圧の周波数ｆｇが所定の周波数ｆηを下回ったことを検出すること、交流励磁形発電電動機１の回転数がＮｍｉｎを下回らないようにしながら、最速にて交流励磁形発電電動機１の回転エネルギーを放出させ有効電力Ｐｇを増加させる方向に制御する以外は上述した電力系統が加速した場合の制御と同様である。
また、上記はｑ軸制御として有効電力を制御している例を示したが、ｑ軸制御として回転数あるいはすべりを制御している場合でも、同様の効果を得ることができる。
【００２６】
なお、応答時間を短縮するために、利用可能回転エネルギー計算手段３３ｃや有効電力値計算手段３３ｆの代わりに、例えば利用可能な回転エネルギーを求める手段としての有効電力値記憶手段を設け、この有効電力値記憶手段に回転数に対応させて予め算出しておいた利用可能回転エネルギーΔＥ及び可能制御量ΔＰｃをテーブルとして記憶させておき、加減速抑制指令信号Ｓ２が発せられたとき、当該テーブルを参照して回転数Ｎに対応した可能制御量ΔＰｃを読み出すようにすることもできる。
【００２７】
以上のように、この実施の形態によれば、利用可能な回転エネルギーを求め、電力系統の周波数が変動したとき、利用可能な回転エネルギーと予め定められた抑制継続時間とから求めた交流励磁形発電電動機の有効電力の可能制御量だけ交流励磁形発電電動機の有効電力を増減して、すなわち利用可能な回転エネルギーに応じて交流励磁形発電電動機の有効電力を制御することにより、利用可能な回転エネルギーを最大限に活用して電力系統の周波数変動を迅速に抑制することができる。
【００２８】
また、交流励磁形発電電動機１の固定子巻線電圧Ｖｇ、周波数ｆｇ、電流Ｊｇ、電力Ｐｇなどの交流励磁形発電電動機の諸量の情報に基づいて、交流励磁形発電電動機の有効電力を制御することができる。従って、交流励磁形発電電動機の制御装置と電力系統との距離が遠い場合でも、信号の伝送遅れ、信号品質の低下、建設費の増加などを防止できる。
【００２９】
実施の形態２．
図３及び図４はこの発明の他の実施の形態を示すものであり、図３は交流励磁形発電電動機の制御装置の構成図、図４は図３の加減速抑制信号発生器の構成図である。この実施の形態においては、図３のように加減速抑制信号発生器１３３を設けている。加減速抑制信号発生器１３３は、図４に示すように制御継続時間計算手段１３３ｅ、制御可能有効電力値計算手段１３３ｆ及び周波数変動抑制手段としての抑制信号生成手段１３３ｇを有する。その他の構成については、図１及び図２に示した実施の形態１と同様のものであるので、相当するものに同じ符号を付して説明を省略する。
【００３０】
交流励磁形発電電動機１は、固定子の電流容量、回転子の電流容量あるいは制御装置、電力変換器の性能から運転可能な有効電力の範囲が決まっている。この運転可能な有効電力の最大値をＰｍａｘ、最小値をＰｍｉｎ、そのときの運転有効電力をＰａとすると、利用可能な有効電力値は、（Ｐｍａｘ−Ｐａ）、あるいは（Ｐｍｉｎ−Ｐａ）となる。制御可能有効電力値計算手段１３３ｆが、この（Ｐｍａｘ−Ｐａ）、あるいは（Ｐｍｉｎ−Ｐａ）を求める。これをΔＰｍａとする。
【００３１】
次に、制御継続時間計算手段１３３ｅが、このΔＰｍａと上記（２）式に示した利用可能な回転エネルギーΔＥとから制御継続時間ｔ１を次のようにして求める。
ｔ１＝ΔＥ／ΔＰｍａ （４）
抑制信号生成手段１３３ｇは、抑制信号Ｓ７をこのΔＰｍａ、ｔ１の関数による図４の抑制信号生成手段１３３ｇの枠内に示すような、一定時間ｔ１の間有効電力をΔＰｍａだけ減少させる信号とすることにより、交流励磁形発電電動機１を過度に制御することなく許容運転限度内での加減速抑制制御を行い、電力系統の周波数変動を抑制する。
【００３２】
なお、利用可能な有効電力は、必要に応じ、定常的な運転に対する定格値、時間の関数として表される過渡的な限界値のどちらを適用してもよい。
また、図示していないが、電力系統の加減速抑制制御により電力系統が減速状態となった後も加速抑制制御を継続すると電力系統の減速を拡大し電力系統を不安定とする可能性があるため、上述の加減速抑制信号発生器１３３には、上記計算により求まった制御時間ｔ１に関係なく、一定時間で、あるいは周波数変化など例えば周波数が低下方向に転じたことを検出し、この抑制制御Ｓ７を止める加減速抑制制御停止器が付加されている。
【００３３】
以上のように、この実施の形態によれば、利用可能な回転エネルギーと制御可能有効電力値とから制御継続時間を求め、電力系統の周波数が変動したとき、制御可能有効電力値だけ交流励磁形発電電動機の有効電力を増減する、すなわち利用可能な回転エネルギーに応じて交流励磁形発電電動機の有効電力を増減することにより、利用可能な回転エネルギーを最大限に活用して電力系統の周波数変動を迅速に抑制することができる。
【００３４】
実施の形態３．
図５、図６はさらにこの発明の他の実施の形態を示すものであり、図５は交流励磁形発電電動機の制御装置の構成図、図６は図５の条件検出器のロジック回路図である。以上に示した実施の形態１及び２は、加減速抑制のための信号を制御目標有効電力設定器１３の設定値に加算する方式であるが、加減速抑制制御を行うときは図５に示すように制御モード切換器３５によりｑ軸制御を回転数制御に切り換え、その制御目標回転数Ｎｖを運転可能回転数の上限値あるいは下限値とすることによっても、交流励磁形発電電動機１の能力限度内で電力系統の周波数変動抑制制御を実現できる。以下、具体的に説明する。
【００３５】
図５において、交流励磁形発電電動機１の制御装置には、条件検出器３４、制御モード切換器３５、周波数変動抑制手段としての目標回転数変更器４０及び回転数偏差検出器４１が設けられている。条件検出器３４は、電力系統３が加速あるいは減速しつつあることを検出し、制御モード切換器３５及び目標回転数変更器４０に切換信号Ｓ９，Ｓ１０，Ｓ１１（詳細後述）を発信する。制御モード切換器３５は、通常は電力偏差検出器１４からの偏差ΔＰをｑ軸制御装置１５に与える。そして、切換信号Ｓ９を受信すると、回転数偏差検出器４１からの回転数の偏差ΔＮをｑ軸制御装置１５に与えるように切り換える。
【００３６】
目標回転数変更器４０は、通常の回転数制御時の目標値Ｎｒ、運転可能回転数の下限値Ｎｍｉｎ、運転可能回転数の上限値Ｎｍａｘを記憶しており、切換信号Ｓ１０、Ｓ１１に応じてこれらの値のうちの一つを選択して目標回転数Ｎｖとして回転数偏差検出器４１に出力する。回転数偏差検出器４１は、目標回転数Ｎｖと回転数Ｎとの偏差ΔＮを出力する。
その他の構成については、図１に示した実施の形態１と同様のものであるので、相当するものに同じ符号を付して説明を省略する。
【００３７】
制御モード切換器３５は、通常は、電力偏差検出器１４からの偏差ΔＰを、ｑ軸制御装置１５に与えるように切り換えられている。ここで、条件検出器３４の動作を図４に基づいて説明する。条件検出器３４は、交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇが周波数ｆζよりも大きくなると、信号Ｓ９を出して制御モード切換器３５を回転数偏差検出器４１側に切換えるとともに、目標回転数を運転可能回転数の上限値Ｎｍａｘに変更するように、目標回転数変更器４０に変更指令Ｓ１０を発信する。
【００３８】
逆に、交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇがｆηよりも小さくなったとき、つまり電力系統が減速したときは、信号Ｓ９を出して制御モード切換器３５を回転数偏差検出器４１側に切換えるとともに、信号Ｓ１１を発信して目標回転数変更器４０により目標回転数Ｎｖを回転数の下限値Ｎｍｉｎに変更する。これにより電力系統３が加速しているときには上限値Ｎｍａｘ、電力系統が減速しているときには下限値Ｎｍｉｎに制御することができる。
【００３９】
つまり、電力系統が加速しているときに交流励磁形発電電動機１の出力を低下させる方向の制御、電力系統が減速しているときに交流励磁形発電電動機１の出力を増加させる方向の制御となり、電力系統の周波数変動を抑制できる。
【００４０】
なお、以上は回転数制御にて説明したが、すべり制御であっても同様の効果を得ることができる。また、以上は制御モード切換信号Ｓ９が発せられる前はｑ軸制御を電力偏差検出器１４からの偏差ΔＰに基づいて制御しているものを説明したが、常に回転数あるいはすべりに基づいてｑ軸制御をしているものであってもよい。この場合は、制御モードの切換は不要であり、回転数あるいはすべりの目標値だけを変更することにより同様の効果が得られる。
【００４１】
また、以上では目標回転数Ｎｖを上限あるいは下限の回転数Ｎｍａｘ，Ｎｍｉｎに切り換えるものを示したが、この目標回転数Ｎｖを固定子巻線電圧の周波数ｆｇの上昇速度あるいは低下速度に応じて例えば比例させて変更するようにしても同様の効果を奏する。
【００４２】
実施の形態４．
図７〜図９は、さらにこの発明の他の実施の形態を示すものであり、図７は交流励磁形発電電動機の制御装置の構成図である。図８は図７の変換器制御装置の励磁周波数切換器の構成図、図９は図７の周波数切換条件検出器のロジック回路図である。上記実施の形態３では、回転数制御に切り換える方式を示したが、電力変換器４の出力周波数、つまり交流励磁形発電電動機１の回転子の励磁周波数を変更しても同様な効果を得ることができる。図７は、この場合の構成を示し、変換制御装置１０６は、励磁周波数切換器１０６ａを有する。また、周波数切換条件検出器４２が設けられている。周波数切換条件検出器４２及び励磁周波数切換器１０６ａが、この発明における周波数変動抑制手段である。
【００４３】
この実施の形態における励磁周波数切換器１０６ａは、図１の変換器制御装置６のすべり周波数制御器６ａの代わりに設けられたものである。図８に示すように、励磁周波数切換器１０６ａは切換スイッチ１０６ｂを有し、励磁周波数を実すべり周波数ｆｓ１、マイナスすべり最大周波数値ｆｓ２、プラスすべり最大周波数値ｆｓ３に切換えることができる。
【００４４】
図９は、周波数切換条件検出器４２のロジック回路を示したものであり、交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇが所定の範囲内（ｆζ≧ｆｇ≧ｆη）にあるときは、通常のすべり周波数制御を選択する信号Ｓ１５を発信する。電力系統が加速され、交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇが所定の周波数ｆζよりも大きくなったときはマイナスすべり最大周波数値ｆｓ２を選択する信号Ｓ１６を発信する。電力系統が減速され、交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇが所定の周波数ｆη（但し、ｆη＜ｆζ）よりも小さくなったときはプラスすべり最大周波数値ｆｓ３を選択する信号Ｓ１７を発信する。この信号Ｓ１５，Ｓ１６，Ｓ１７を励磁周波数切換器１０６ａが受信して電力変換器４の出力周波数を変更する。
【００４５】
電力変換器４の周波数がマイナスすべり最大周波数値ｆｓ２に設定されると、交流励磁形発電電動機１は許容最大回転数になるよう回転数が増加、つまり有効電力を低下させる方向に変化する。プラスすべり最大周波数値ｆｓ３選択時はその逆に変化する。よって、実施の形態４と同様、電力系統の周波数変動を抑制できる。
【００４６】
なお、以上は電力変換器４の出力周波数の制御値をプラスすべり最大周波数値、マイナスすべり最大周波数値に切り換えるものを説明した。しかし、この出力周波数の制御値を固定子周波数の上昇速度あるいは低下速度に応じて、例えば比例させて、プラスすべり最大周波数値あるいはマイナスすべり最大周波数値の方向に変更するものであっても、同様な効果が得られる。
【００４７】
実施の形態５．
図１０〜図１２は、さらにこの発明の他の実施の形態を示すものであり、図１０は交流励磁形発電電動機の制御装置の構成図、図１１は図１０の加減速抑制信号発生器の構成図である。図１２は、図１０とは別の交流励磁形発電電動機の制御装置の構成図である。この実施の形態は、図１における加減速抑制信号発生器３３の代わりに、図１０及び図１１に示す加減速抑制信号発生器２３３を設けることにより電力系統の周波数変動を速やかに収束させるものである。
【００４８】
加減速抑制信号発生器２３３は、図１１に示すように、スイッチ制御回路２３３ａ、偏差検出器２３３ｂ、周波数変動抑制手段としての位相補正回路２３３ｃ、開閉スイッチ２３３ｄを有している。偏差検出器２３３ｂは、定格周波数ｆ０と、交流励磁形発電電動機１の固定子巻線電圧Ｖｇの周波数ｆｇとの偏差Δｆを出力し、この偏差Δｆを位相補正回路２３３ｃにて位相補正した信号を、開閉スイッチ２３３ｄを介して電力偏差検出器１４に与えるように構成されている。
【００４９】
図１１において、常時は、開閉スイッチ２３３ｄが開放している。電力系統が加速して交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇが所定の周波数ｆζよりも大きくなったときに、開閉スイッチ２３３ｄを閉成して位相補正された信号Ｓ２０を電力偏差検出器１４（図１０）に与える。これにより、周波数の偏差に応じてｑ軸制御を変化させて電力系統の周波数変動を抑制する。
【００５０】
その後、交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇが所定の周波数ｆθ（但し、ｆθ＜ｆζ、例えばｆζ＝ｆ０＋Δｆ５に設定する、Δｆ５は所定値）を下回った状態、及び交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇが所定の周波数ｆκ（但し、ｆκ＜ｆη、例えばｆη＝ｆ０＋Δｆ５に設定する、Δｆ５は所定値）を上回った状態が所定時間継続したときに、電力系統の過渡的な動揺が収束したと判断し、スイッチ制御回路２３３ａにより開閉スイッチ２３３ｄを開放して電力偏差検出器１４へ信号Ｓ２０を出力しないようにする。
【００５１】
電力系統が減速して交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇが所定の周波数ｆη（但し、ｆη＜ｆζ）よりも小さくなったときも、同様に開閉スイッチ２３３ｄを閉成して位相補正された信号Ｓ２０を電力偏差検出器１４（図１０）に与える。これにより、周波数の偏差に応じてｑ軸制御を変化させて電力系統の加減速を抑制する。
【００５２】
位相補正は、電力系統の特性、当該交流励磁形発電電動機の制御系及び交流励磁形発電電動機自身の時定数などを考慮し、電力系統の周波数変動抑制に最適なタイミングで制御するためのものである。
【００５３】
また、図１２に示すように、周波数変化率検出器（例えば、微分器）４４と位相補正器４５を組み合わせて用いることもできる。図１２においては、周波数変化率検出器４４にて交流励磁形発電電動機１の周波数の変化率を検出して位相補正器４５に入力し、この変化率に所定の位相補正を行って信号Ｓ２１を電力偏差検出器１４に加算するように構成している。
【００５４】
位相補正は、上記のように交流励磁形発電電動機１又は電力系統３の周波数の変化率をそのまま位相補正回路４５に入力するようにしてもよいし、定格周波数ｆ０と交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇ又は電力系統３の周波数との偏差を位相補正するようにしてもよい。
なお、この実施の形態において、有効電力を制御する代わりに、交流励磁形発電電動機１の回転数又はすべり周波数を制御しても同様の効果を奏する。
以上により、電力系統の加減速による動揺が長く継続するような場合でも、速やかに電力系統の加減速を収束させ、電力系統の安定度を向上させることができる。
【００５５】
実施の形態６．
図１３は、さらにこの発明の他の実施の形態を示す交流励磁形発電電動機の制御装置の構成図である。実施の形態５においては、連続的に電力系統の加減速を抑制するものを示した。しかし、これらの方式の場合、位相補正回路２３３ｃ（図１１）や位相補正器４５のゲインをあまり大きく取ると小さな周波数変動においても交流励磁形発電電動機１の出力を大きく変化させることになり、電力系統の不要な周波数変化を発生させる可能性があり、ゲインはあまり大きな値とすることができない。
【００５６】
このため、電力系統の動揺が大きい場合の第１波に対する抑制力が不足する場合がある。このような場合、図１３に示すように周波数変化率検出器４４と位相補正器４５を設ける。そして、周波数変動抑制手段としての位相補正器４５により位相補正された信号Ｓ２１を電力偏差検出器１４に加える。このように構成することにより、電力系統の大きな動揺から、大きな動揺が収まった後の収束性の改善まで、広範囲の電力系統の周波数変動を抑制することができる。
【００５７】
なお、動揺の第１波に対しては図１に示した加減速抑制制御信号発生器３３による抑制制御を行い、その後は図１３に示した位相補正器４５による抑制制御に切り換える切換器を設けても同様の効果を得ることができる。
【００５８】
実施の形態７．
図１４は、さらにこの発明の他の実施の形態を示す交流励磁形発電電動機の制御装置の構成図である。実施の形態１や２では、回転エネルギーなどから求めた時間の間、電力系統の加速あるいは減速を抑制するための抑制信号を継続させるものを示した。しかし、例えば電力系統の加速抑制制御中に電力系統３が減速域となった後もこの制御を継続させると逆に減速を拡大させる。
【００５９】
この実施の形態においては、図１４のように抑制制御解除器４６を設ける。抑制制御解除器４６は、周波数検出器３０から交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇを得て、周波数ｆｇと定格周波数ｆ０との差の絶対値｜ｆｇ−ｆ０｜が所定値Δｆ２を下回るようになったとき、加減速抑制制御器３３からの信号Ｓ６を遮断して抑制制御を解除する。このように、加速抑制制御の結果交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇが定格周波数付近に戻ってきたことを検出し抑制制御を解除することにより、上記のような過度な抑制制御を防止することができる。
【００６０】
この実施の形態では、図１に示した実施の形態の制御装置に抑制制御解除器４６を設けたものを示したが、実施の形態２〜６に示したものに抑制制御解除器４６を設けても同様の効果を奏する。
【００６１】
実施の形態８．
図１５、図１６は、さらにこの発明の他の実施の形態を示すもので、図１５は交流励磁形発電電動機の制御装置の構成図、図１６は有効電力制限器の構成図である。交流励磁形発電電動機１は運転可能な出力範囲を持っており、以上に示した各実施の形態１〜７における加減速抑制制御において、この運転可能な出力範囲を超えた運転状態となる可能性がある。この実施の形態は、これを防止するためのものである。
【００６２】
図１５において、交流励磁形発電電動機１の制御装置には有効電力制限器４８が設けられ、有効電力検出器１２にて検出された有効電力Ｐｇに基づいてｑ軸制御装置１５へ電力制御のための制御信号Ｓ３１を発信する。ｑ軸制御装置１５は、上記制御信号Ｓ３１に従って交流励磁形発電電動機１の電力を制御する。有効電力制限器４８は、図１６に示すように対上限偏差検出器４８ａ、対下限偏差検出器４８ｂ、高値選択器４８ｃ、低値選択器４８ｄを有する。有効電力制限器４８には、電圧偏差検出器１４から偏差ΔＰが、有効電力検出器１２から有効電力ｐｇが入力される。
【００６３】
対上限偏差検出器４８ａは、有効電力検出器１２からの有効電力ｐｇと交流励磁形発電電動機１の運転可能な有効電力の上限値Ｐｍａｘとの偏差ΔＰ１を求める。対下限偏差検出器４８ｂは、有効電力検出器１２からの有効電力ｐｇと交流励磁形発電電動機１の運転可能な有効電力の下限値Ｐｍａｘとの偏差ΔＰ２を求める。
【００６４】
高値選択器４８ｃは、偏差ΔＰと偏差ΔＰ２とを比較し、高い方の値を低値選択器４８ｄに出力する。低値選択器４８ｄは、高値選択器４８ｃからの出力と偏差ΔＰ１とを比較し低い方の値を選択し、制御信号Ｓ３１として、ｑ軸制御装置１５に出力する。ｑ軸制御装置１５は、この制御信号Ｓ３１に基づき交流励磁形発電電動機１の有効電力を制御する。
【００６５】
これにより、交流励磁形発電電動機１が有効電力の上限値Ｐｍａｘと下限値Ｐｍｉｎとの間で運転されているときは、高値選択器４８ｃ、低値選択器４８ｄとも偏差ΔＰの方を選択するため、制御信号Ｓ３１として偏差ΔＰがそのまま出力される。そして、交流励磁形発電電動機１の有効電力ＰｇがＰｍａｘより大きくなったとすると、有効電力と上限値Ｐｍａｘとの偏差ΔＰ１はマイナス（負）、有効電力Ｐｇと下限値Ｐｍｉｎとの偏差ΔＰ２もマイナス（負）となる。一方、有効電力Ｐｇが増加していることから偏差ΔＰは有効電力を増加させる方向のプラスであり、高値選択器４８ｃでは高い方の値である偏差ΔＰが選択される。
【００６６】
低値選択器４８ｄでは、低い方の値である有効電力Ｐｇと上限値Ｐｍａｘとの偏差ΔＰ１が選択される。従って、制御信号Ｓ３１として偏差ΔＰ１が選択され、有効電力を抑制する方向に制御される。最終的には偏差零つまり有効電力が上限値Ｐｍａｘに到達する。また、交流励磁形発電電動機１の有効電力Ｐｇが下限値Ｐｍｉｎより小さくなったときは、制御信号Ｓ３１として偏差ΔＰ２が出力される。そして、有効電力を増加する方向に制御され、最終的には有効電力が下限値Ｐｍｉｎまで回復する。
以上により、交流励磁形発電電動機１が許容範囲を超えて運転されるのを防止できる。
【００６７】
この実施の形態では、有効電力Ｐｇの大きさに応じて時限特性無しで有効電力の出力制限を行うものを示したが、交流励磁形発電電動機１の有する過負荷耐量を有効に活用するために所定時間所定量の過負荷を許容するように時限特性を持たせたようなものであってもよい。また、有効電力の代わりに固定子電流の制御を行う制限制御方式、有効電力以外に無効電力を加味してｄ、ｑ両軸の制限制御を行う方式、あるいは交流励磁形発電電動機１の運転可能な回転数範囲での運転となるよう回転数の制限制御を行う方式としてもよい。
【００６８】
この実施の形態では、図１の実施の形態の制御装置に有効電力制限器４８を設けたものを示したが、実施の形態２〜７に示したものに有効電力制限器４８を設けても同様の効果を奏する。
【００６９】
実施の形態９．
図１７は、さらにこの発明の他の実施の形態を示す原動機制御器の構成図である。図１７において、周波数調整用制御手段としての原動機制御器５０は、周波数偏差検出器５０ａ、原動機出力増減信号発信器５０ｂを有している。以上の各実施の形態においては、電力系統３の加減速を抑制する方式について示した。しかしながら、電力系統の加減速が収束した後、電力系統の需給バランスが崩れ、電源（供給）に比べ負荷（需要）の方が多いと周波数は低めで、逆だと高めで安定する。交流励磁形発電電動機１にポンプ水車などの原動機が接続されている場合は、図１７に示す原動機制御器５０（発電方向の例）を設けて、その出力を制御する。
【００７０】
原動機制御器５０は、その周波数偏差検出器５０ａにて定格周波数ｆ０と交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇとの偏差Δｆを求めて原動機出力増減信号発信器５０ｂに与える。原動機出力増減信号発信器５０ｂは、偏差Δｆが所定値λよりも大きくなると原動機出力増の信号Ｓ４１を出力し、偏差Δｆが（−λ）よりも小さくなると原動機出力減の信号Ｓ４２を出力し、図示しない原動機の出力を制御する。これにより、交流励磁形発電電動機１の入力を調整し、その能力の範囲内で需給バランスの崩れを補償することができる。
【００７１】
実施の形態１０．
図１８は、さらにこの発明の他の実施の形態を示す原動機制御器の構成図である。図１８において、すべり値調整用制御手段としての原動機制御器５１は、すべり値検出器５１ａ、原動機出力増減信号発信器５１ｂを有している。電力系統３の加減速が収束した後、電力系統の需給バランスを極力維持しようと制御した結果、交流励磁形発電電動機１がその可変周波数の上限あるいは下限での運転状態となる場合がある。この状態での運転の場合、次に電力系統での加減速が発生した場合、加速あるいは減速のどちらかの抑制制御ができない。そこで、この実施の形態においては、このような事態を防止するために、交流励磁形発電電動機１にポンプ水車などの原動機が接続されている場合は、図１８に示す原動機制御器（発電方向の例）５１を付加する。
【００７２】
原動機制御器５１は、そのすべり検出器５１ａにて交流励磁形発電電動機１の固定子巻線電圧の周波数ｆｇと回転数Ｎからすべり値Ｓを求めて原動機出力増減信号発信器５１ｂに与える。原動機出力増減信号発信器５１ｂは、すべり値Ｓが所定値Ｓｐｍよりも大きくなると原動機出力増の信号Ｓ４３を、すべり値Ｓが（−Ｓｐｍ）よりも小さくなると原動機出力減の信号Ｓ４４を出力し、図示しない原動機の出力を制御する。これにより、交流励磁形発電電動機１の入力を調整し、その能力の範囲内で交流励磁形発電電動機１がその可変周波数限度内での運転となるよう制御することが可能である。所定値Ｓｐｍを、例えば通常運用時の制御目標のすべり値に設定すると、すべり値が制御目標のすべり値になるように原動機の出力が制御される。
【００７３】
実施の形態１１．
図１９は、さらにこの発明の他の実施の形態を示す原動機制御器の構成図である。この実施の形態は、図１７に示した周波数を制御するための原動機制御器５０と図１８に示したすべり値を制御する原動機制御器５１との両者の機能を有するものである。図１９において、周波数及びすべり値調整用制御手段としての原動機制御器５４は、周波数偏差検出器５０ａ、原動機出力増減信号発信器５０ｂ、すべり検出器５１ａ、原動機出力増減信号発信器５１ｂ、ＯＲ回路５４ａ，５４ｂを有している。
【００７４】
ＯＲ回路５４ａは、偏差Δｆが所定値λより大きくなるか、すべり値Ｓが所定値Ｓｐｍより大きくなると原動機出力増の信号Ｓ４５を発し、原動機の出力を増加させる。ＯＲ回路５４ｂは、偏差Δｆが（−λ）よりも小さくなるか、すべり値Ｓが（−Ｓｐｍ）よりも小さくなると原動機出力減の信号Ｓ４５を発し、原動機の出力を減少させる。交流励磁形発電電動機１の能力の範囲内で、電力系統の周波数維持及び引き続き発生する電力系統の周波数変動に対する加減速抑制制御能力を確保することができる。
【００７５】
なお、実施の形態１〜８では交流励磁形発電電動機１の駆動装置には触れなかったが、本発明は、この駆動装置が水車／ポンプのような原動機／回転負荷であるシステムあるいは同期調相機のように駆動装置が無いシステムのどちらにも適用可能で、いずれにおいても同様の効果を奏する。
【００７６】
【発明の効果】
この発明に係る交流励磁形発電電動機の制御装置は、以上説明したように、固定子巻線が電力系統に接続されるとともに回転子巻線が可変周波数の電力変換器に接続された交流励磁形発電電動機を制御するものであって、固定子巻線の電圧の周波数を検出する周波数検出手段と、交流励磁形発電電動機の回転数を検出する回転数検出手段と、交流励磁形発電電動機の運転可能な回転数の上限値と下限値と回転数とに基づいて交流励磁形発電電動機の利用可能な回転エネルギーを求める手段と、利用可能な回転エネルギーに応じて電力変換器を介して交流励磁形発電電動機の有効電力を制御することにより電力系統の周波数変動を抑制する周波数変動抑制手段とを備えたものであるので、
利用可能な回転エネルギーを求め、電力系統の周波数が変動したとき、上記利用可能な回転エネルギーに応じて交流励磁形発電電動機の有効電力を制御することにより電力系統の周波数変動を迅速に抑制することができる。
【００７７】
そして、固定子巻線が電力系統に接続されるとともに回転子巻線が可変周波数の電力変換器に接続された交流励磁形発電電動機を制御するものであって、固定子巻線の電圧の周波数を検出する周波数検出手段と、交流励磁形発電電動機の回転数を検出する回転数検出手段と、交流励磁形発電電動機の固定子巻線の電圧の周波数の変動に応じて交流励磁形発電電動機の運転可能な回転数の上限値又は下限値になるように電力変換器を介して交流励磁形発電電動機の回転数を制御することにより電力系統の周波数変動を抑制する周波数変動抑制手段とを備えたものであるので、
交流励磁形発電電動機の回転数が運転可能な回転数の上限値又は下限値になるように交流励磁形発電電動機の有効電力を増減することにより電力系統の周波数の変動を迅速に抑制することができる。
【００７８】
さらに、固定子巻線が電力系統に接続されるとともに回転子巻線が可変周波数の電力変換器に接続された交流励磁形発電電動機を制御するものであって、固定子巻線の電圧の周波数を検出する周波数検出手段と、交流励磁形発電電動機の回転数を検出する回転数検出手段と、交流励磁形発電電動機の固定子巻線の電圧の周波数と回転数からすべり周波数を求める手段と、交流励磁形発電電動機の固定子巻線の電圧の周波数の変動に応じてすべり周波数が交流励磁形発電電動機の回転子の励磁可能な励磁周波数の上限値又は下限値になるように電力変換器の出力周波数を制御することにより電力系統の周波数変動を抑制する周波数変動抑制手段とを備えたものであるので、
すべり周波数が交流励磁形発電電動機の回転子の励磁可能な励磁周波数の上限値又は下限値になるように電力変換器の出力周波数を制御することにより電力系統の周波数の変動を迅速に抑制することができる。
【００７９】
また、固定子巻線が電力系統に接続されるとともに回転子巻線が可変周波数の電力変換器に接続された交流励磁形発電電動機を制御するものであって、固定子巻線の電圧の周波数を検出する周波数検出手段と、交流励磁形発電電動機の固定子巻線の電圧の周波数と基準となる所定の周波数との周波数偏差又は交流励磁形発電電動機の固定子巻線の電圧の周波数の変化率を検出して所定の位相補正する位相補正手段と、交流励磁形発電電動機の固定子巻線の電圧の周波数の変動に応じて位相補正された周波数偏差又は位相補正された周波数の変化率に基づき電力変換器を介して交流励磁形発電電動機の有効電力又は回転数又はすべり周波数を制御することにより電力系統の周波数変動を抑制する周波数変動抑制手段とを備えたものであるので、
位相補正された周波数偏差又は周波数の変化率に基づき交流励磁形発電電動機の有効電力又は回転数又はすべり周波数を制御することにより電力系統の周波数の変動を迅速に抑制することができる。
【図面の簡単な説明】
【図１】この発明の実施の一形態である交流励磁形発電電動機の制御装置の構成図である。
【図２】図１の加減速抑制信号発生器の構成図である。
【図３】この発明の他の実施の形態である交流励磁形発電電動機の制御装置の構成図である。
【図４】図３の加減速抑制信号発生器の構成図である。
【図５】さらに、この発明の他の実施の形態である交流励磁形発電電動機の制御装置の構成図である。
【図６】図５の条件検出器のロジック回路図である。
【図７】さらに、この発明の他の実施の形態である交流励磁形発電電動機の制御装置の構成図である。
【図８】図７の変換器制御装置の励磁周波数切換器の構成図である。
【図９】図７の周波数切換条件検出器のロジック回路図である。
【図１０】さらに、この発明の他の実施の形態である交流励磁形発電電動機の制御装置の構成図である。
【図１１】図１０の加減速抑制信号発生器のロジック回路及び構成図である。
【図１２】図１０の制御装置とは別の交流励磁形発電電動機の制御装置の構成図である。
【図１３】さらに、この発明の他の実施の形態を示す交流励磁形発電電動機の制御装置の構成図である。
【図１４】さらに、この発明の他の実施の形態を示す交流励磁形発電電動機の制御装置の構成図である。
【図１５】この発明の他の実施の形態である交流励磁形発電電動機の制御装置の構成図である。
【図１６】図１５の有効電力制限器の構成図である。
【図１７】さらに、この発明の他の実施の形態を示す原動機制御器の構成図である。
【図１８】さらに、この発明の他の実施の形態を示す原動機制御器の構成図である。
【図１９】さらに、この発明の他の実施の形態を示す原動機制御器の構成図である。
【符号の説明】
１ 交流励磁形発電電動機、３ 電力系統、４ 電力変換器、
６ 変換器制御装置、７ 位相及び回転数検出器、８ 電圧検出器、
９ 制御目標電圧設定器、１０ 電圧偏差検出器、１１ ｄ軸制御装置、
１２ 有効電力検出器、１３ 制御目標有効電力設定器、
１４ 電力偏差検出器、１５ ｑ軸制御装置、３０ 周波数検出器、
３１ 電流検出器、３３ 加減速抑制信号発生器、
３３ａ 加減速発生時抑制指令信号発信手段、
３３ｃ 利用可能回転エネルギー計算手段、３３ｅ 制御継続時間設定手段、
３３ｆ 有効電力計算手段、３３ｇ 抑制信号生成手段、３４ 条件検出器、
３５ 制御モード切換器、４０ 目標回転数変更器、４１ 回転数偏差検出器、
４２ 周波数切換条件検出器、４４ 周波数変化率検出器、４５ 位相補正器、
４６ 抑制制御解除器、４８ 有効電力制限器、
５０，５１，５４ 原動機制御器、１０６ 変換器制御装置、
１０６ａ 励磁周波数切換器、１３３ 加減速抑制信号発生器、
１３３ｆ 制御可能有効電力計算手段、１３３ｅ 制御継続時間計算手段、
１３３ｇ 抑制信号生成手段、２３３ 加減速抑制信号発生器、
２３３ｃ 位相補正回路。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a control device for an AC excitation type generator motor, and more particularly to a control device for an AC excitation type generator motor which can quickly suppress frequency fluctuations in a power system.
[0002]
[Prior art]
When the amount of power generated by the generator connected to the power system and generating power is greater than the amount of power consumed by the load via the power system, the surplus of the power generated by the generator acts as acceleration energy for the generator. Therefore, the generator speed increases and the AC frequency increases accordingly. Conversely, when the amount of power generation is insufficient, the shortage acts as deceleration energy of the generator, so that the generator speed decreases and the AC frequency decreases accordingly.
[0003]
In the middle of the power supply source and demand end, fluctuations in the supply and demand of energy are detected from these fluctuations in the AC frequency, and the excess or deficiency is temporarily converted to the inertial energy of the generator motor to generate fluctuations in the generated power or load. There is known a method for suppressing power fluctuations caused by power. Of course, these methods do not absorb or release long-term active power, but rather attempt to suppress such fluctuations by repeating absorption and release of active power in a short period of about several seconds. (For example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-10-295097 (page 3)
[0005]
[Problems to be solved by the invention]
In the conventional AC-excited generator motor control device as described above, a control device that can quickly suppress the frequency fluctuation of the power system by maximizing the available rotational energy of the available AC-excited generator motor is desired. I was Further, in suppressing the frequency fluctuation of the power system, it is necessary to prevent the rotational speed of the AC excitation type generator motor from rising or falling too much outside the allowable range. When the conditions for controlling the generator are detected on the power system side, especially when the distance between the control device of the generator and the power system is as long as several kilometers, signal transmission delay, deterioration of signal quality, construction cost There was a problem such as an increase.
[0006]
The present invention solves the above-described problems, and can quickly suppress the frequency fluctuation of the power system, and can control the AC-excited generator so that the AC-excited generator-motor can be controlled so as not to operate outside the allowable operation range. It is an object to obtain a control device for an electric motor.
[0007]
[Means for Solving the Problems]
A control device for an AC excitation type generator motor according to the present invention controls an AC excitation type generator motor in which a stator winding is connected to a power system and a rotor winding is connected to a variable frequency power converter. Frequency detection means for detecting the frequency of the voltage of the stator winding, rotation speed detection means for detecting the rotation speed of the AC excitation generator motor, and the upper limit of the operable rotation speed of the AC excitation generator motor Means for determining the available rotational energy of the AC-excited generator motor based on the value, the lower limit value, and the number of revolutions, and the active power of the AC-excited generator motor via the power converter according to the available rotational energy. Frequency fluctuation suppressing means for controlling the frequency fluctuation of the power system by controlling.
[0008]
The stator winding is connected to a power system, and the rotor winding controls an AC-excited generator motor connected to a variable frequency power converter, and the frequency of the stator winding voltage is controlled. Frequency detecting means for detecting the rotation speed of the AC excitation type generator motor, and the rotation speed detection means for detecting the rotation speed of the AC excitation type generator motor. Frequency fluctuation suppression means for controlling the frequency of the AC-excited generator motor via the power converter so as to be at the upper limit value or the lower limit value of the operable speed, thereby suppressing frequency fluctuation of the power system. Things.
[0009]
Further, the stator winding is connected to a power system and the rotor winding controls an AC excitation type generator motor connected to a variable frequency power converter, and the frequency of the stator winding voltage is controlled. Frequency detection means for detecting the rotation speed of the AC excitation type generator motor, rotation speed detection means, and means for determining the slip frequency from the frequency and the rotation speed of the stator winding voltage of the AC excitation type generator motor, The power converter is controlled so that the slip frequency becomes the upper limit or lower limit of the exciting frequency of the rotor of the AC excitation generator motor in accordance with the frequency fluctuation of the stator winding voltage of the AC excitation generator motor. Frequency fluctuation suppressing means for suppressing the frequency fluctuation of the power system by controlling the output frequency.
[0010]
In addition, the stator winding is connected to a power system and the rotor winding controls an AC excitation type generator motor connected to a variable frequency power converter, and the frequency of the stator winding voltage is controlled. And a frequency deviation between the frequency of the stator winding voltage of the AC excitation type generator motor and a predetermined reference frequency or a change in the frequency of the stator winding voltage of the AC excitation type generator motor. Phase correction means for detecting the rate and correcting the predetermined phase, and a phase deviation or a rate of change of the phase-corrected frequency in accordance with the fluctuation of the frequency of the voltage of the stator winding of the AC-excited generator motor. Frequency fluctuation suppressing means for suppressing the frequency fluctuation of the power system by controlling the active power, the rotational speed or the slip frequency of the AC excitation type generator motor via the power converter.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a configuration diagram of a control device of an AC excitation type generator motor, and FIG. 2 is a configuration diagram of an acceleration / deceleration suppression signal generator of FIG. In FIG. 1, the AC-excited generator motor 1 is connected to a power system 3 via a generator bus 25 and a step-up transformer 2. The variable frequency power converter 4 is connected to the generator bus 25 via the excitation transformer 5 and receives power supply.
[0012]
The converter control device 6 includes a current of the rotor of the AC excitation type generator motor 1, the current of which is transformed by the current transformer (CT) 23, a phase and rotation speed detector 7 described later, a d-axis control device 11, The power converter 4 is controlled based on each signal input from the q-axis control device 15. The converter control device 6 has a slip frequency controller 6a. The slip frequency controller 6a detects the slip frequency fs of the AC-excited generator motor 1 and controls the output frequency fe of the power converter 4 to be equal to the slip frequency fs.
[0013]
The phase and rotation speed detector 7 detects the rotation phase and the rotation speed N of the rotor of the AC excitation type generator motor 1. The voltage detector 8 detects a stator voltage Vg of the AC-excited generator motor 1 (the generator bus 25) via the instrument transformer (PT) 22. The control target voltage setter 9 sets the control target voltage V0 of the stator voltage. The voltage deviation detector 10 detects a deviation ΔV between the control target voltage V0 set by the control target voltage setter 9 and the stator voltage Vg detected by the voltage detector 8. The d-axis control device 11 gives a control command value of the d-axis component to the converter control device 6 based on the deviation ΔV detected by the voltage deviation detector 10.
[0014]
The active power detector 12 detects the stator voltage of the AC-excited generator motor 1 transformed by the PT 22 and the current of the stator of the AC-excited generator motor 1 transformed by the current transformer (CT) 21. Based on this, the active power Pg of the stator of the AC excitation type generator motor 1 is detected. In order to reduce the manufacturing cost and shorten the transmission distance of the detected signal, CT21 and PT22 are generator buses 25 on the low voltage side of the step-up transformer 2 and are AC-excited generator motors. 1 is provided.
[0015]
The control target active power setter 13 sets the control target active power P0. The power deviation detector 14 detects a deviation ΔP between the control target active power P0 set by the control target active power setting unit 13 and the active power Pg detected by the active power detector 12. The q-axis control device 15 gives a control command value of the q-axis component to the converter control device 6 based on the deviation ΔP detected by the power deviation detector 14. Frequency detector 30 detects frequency fg of the stator winding voltage of AC-excited generator motor 1 via PT 22.
[0016]
As shown in FIG. 2, the acceleration / deceleration suppression signal generator 33 includes acceleration / deceleration occurrence suppression command signal transmission means 33a, upper / lower limit rotation speed setting means 33b, available rotation energy calculation means 33c, control duration setting means 33e, It has an active power value calculating means 33f and a suppression signal generating means 33g as frequency fluctuation suppressing means. The acceleration / deceleration suppression signal generator 33 detects acceleration / deceleration of the power system and generates a suppression signal S6 for suppressing frequency fluctuation of the power system.
[0017]
Next, the operation will be described. In the case of the AC-excited generator motor 1, the frequency range of the AC excitation of the rotor, that is, the operable rotational speed range of the AC-excited generator motor 1 is sometimes limited from the viewpoint of the economics of the equipment. If a uniform acceleration suppression signal or deceleration suppression signal is added when the operable speed range is limited, there is a possibility that the vehicle will enter an operating range that deviates from the operable speed range.
[0018]
The acceleration / deceleration suppression signal generator 33 absorbs excess active power in the power system 3 as its rotational energy within the maximum allowable range of the AC-excited generator motor 1 or converts insufficient active power into its rotational energy. The AC excitation type generator motor 1 is controlled so as to be discharged from the motor. As a result, the frequency fluctuation of the power system 3 is quickly suppressed, and the AC-excited generator motor 1 is prevented from entering an operation range that deviates from the operable speed range. Hereinafter, the operation will be described in detail.
[0019]
In FIG. 2, acceleration / deceleration occurrence suppression command signal transmission means 33a is accelerated until the frequency fg of the stator winding voltage of the electric power system 3, that is, the AC excitation type generator motor 1 exceeds a predetermined frequency fζ (fg> fζ). Or when the frequency fg is reduced to a value lower than another predetermined frequency fη (however, fη <fζ) (fg <fη), the acceleration / deceleration suppression command signal S2 is transmitted.
[0020]
Upon receiving the acceleration / deceleration suppression command signal S2 from the acceleration / deceleration occurrence suppression command signal transmission means 33a, the available rotation energy calculation means 33c calculates the available rotation energy as follows.
Hereinafter, a case will be described in which the surplus power is absorbed by increasing the rotation speed of the AC excitation type generator motor 1.
[0021]
The rotational energy E1 of the rotor rotating at the rotational speed N is represented by I (kg · m) where I is the inertia rate of the AC-excited generator motor 1.

Is required. Therefore, assuming that the upper limit of the operable rotation speed is Nmax, the rotation energy ΔE when the rotation speed changes from N to Nmax is obtained by Expression (2).

[0022]
The rotational energy ΔE is in the unit of W · sec. Assuming that the control duration of acceleration suppression determined by a simulation calculation or the like is t, the possible control amount ΔPc of the active power at this time is:
ΔPc = ΔE / t (3)
Is determined by The active power value calculating means 33f calculates ΔPc from the control duration time t preset in the control duration setting means 33e and the ΔE based on the equation (3).
Based on this, the suppression signal S6 generated by the suppression signal generation unit 33g is converted into an active power by a function of ΔPc, t for a fixed time t as shown in the frame of the suppression signal generation unit 33g in FIG. By setting the signal to decrease by ΔP, the frequency fluctuation suppression control of the power system within the allowable operation limit can be realized without excessively controlling the AC-excited generator motor 1.
[0023]
Specifically, as shown in FIG. 1, by adding the suppression signal S6 to the power deviation detector 14, control is performed in a direction to reduce the active power, and the acceleration of the power system is suppressed. That is, since the power system is accelerated in the state of power generation amount> load (demand) amount, the generated active power is reduced and absorbed as the rotational energy of the AC-excited generator motor 1, so that the frequency of the power system is reduced. Can be suppressed.
[0024]
The acceleration / deceleration occurrence suppression command signal transmission means 33a issues an acceleration / deceleration suppression command signal S2 when the frequency fg of the stator winding voltage of the AC excitation type generator motor 1 exceeds a predetermined frequency fζ. After receiving the acceleration / deceleration suppression command signal S2, the available rotation energy calculation means 33c, the active power value calculation means 33f, and the suppression signal generation means 33g operate as described above to transmit the suppression signal S6.
[0025]
Note that the control when the power system is decelerated also detects that the frequency fg of the stator winding voltage has fallen below a predetermined frequency fη, and prevents the rotation speed of the AC excitation generator motor 1 from falling below Nmin. However, the control is the same as the above-described control in the case where the power system is accelerated, except that the rotational energy of the AC excitation type generator motor 1 is released at the highest speed and the control is performed in a direction to increase the effective power Pg.
In the above description, the example in which the active power is controlled as the q-axis control is shown. However, the same effect can be obtained even when the rotation speed or the slip is controlled as the q-axis control.
[0026]
In order to shorten the response time, instead of the available rotational energy calculating means 33c and the active power value calculating means 33f, for example, an active power value storage means as a means for obtaining available rotational energy is provided. The available rotational energy ΔE and the possible control amount ΔPc calculated in advance in correspondence with the number of rotations in the value storage means are stored as a table, and when the acceleration / deceleration suppression command signal S2 is issued, the table is referred to. Thus, the possible control amount ΔPc corresponding to the rotation speed N can be read.
[0027]
As described above, according to this embodiment, the available rotational energy is obtained, and when the frequency of the power system fluctuates, the AC excitation type obtained from the available rotational energy and the predetermined suppression duration is determined. By increasing or decreasing the active power of the AC-excited generator motor by the possible control amount of the active power of the generator motor, that is, by controlling the active power of the AC-excited generator motor according to the available rotational energy, It is possible to quickly suppress frequency fluctuations of the power system by making the most of energy.
[0028]
Also, the active power of the AC-excited generator motor is controlled based on various information of the AC-excited generator motor such as the stator winding voltage Vg, frequency fg, current Jg, and power Pg of the AC-excited generator motor 1. can do. Therefore, even if the distance between the control device of the AC excitation type generator motor and the power system is long, it is possible to prevent signal transmission delay, deterioration of signal quality, increase in construction cost, and the like.
[0029]
Embodiment 2 FIG.
3 and 4 show another embodiment of the present invention. FIG. 3 is a configuration diagram of a control device of an AC excitation type generator motor, and FIG. 4 is a configuration diagram of an acceleration / deceleration suppression signal generator of FIG. It is. In this embodiment, an acceleration / deceleration suppression signal generator 133 is provided as shown in FIG. As shown in FIG. 4, the acceleration / deceleration suppression signal generator 133 includes a control duration calculation unit 133e, a controllable active power value calculation unit 133f, and a suppression signal generation unit 133g as a frequency fluctuation suppression unit. Other configurations are the same as those of the first embodiment shown in FIGS. 1 and 2, and the corresponding components are denoted by the same reference numerals and description thereof is omitted.
[0030]
The range of the active power that can be operated in the AC excitation generator motor 1 is determined from the current capacity of the stator, the current capacity of the rotor, or the performance of the control device and the power converter. Assuming that the maximum value of the operable active power is Pmax, the minimum value is Pmin, and the operating active power at that time is Pa, the available active power value is (Pmax-Pa) or (Pmin-Pa). . The controllable active power value calculation means 133f calculates this (Pmax-Pa) or (Pmin-Pa). This is defined as ΔPma.
[0031]
Next, the control duration calculating means 133e calculates the control duration t1 from the ΔPma and the available rotational energy ΔE shown in the above equation (2) as follows.
t1 = ΔE / ΔPma (4)
The suppression signal generation unit 133g sets the suppression signal S7 to a signal that reduces the active power by ΔPma for a certain time t1, as shown in the frame of the suppression signal generation unit 133g in FIG. 4 by the function of ΔPma, t1. As a result, the acceleration / deceleration suppression control within the allowable operation limit is performed without excessively controlling the AC-excited generator motor 1, thereby suppressing the frequency fluctuation of the power system.
[0032]
It should be noted that the available active power may be either a rated value for steady operation or a transient limit value expressed as a function of time, if necessary.
Although not shown, if the acceleration suppression control is continued even after the power system is decelerated by the power system acceleration / deceleration suppression control, the power system may be decelerated and the power system may become unstable. For this reason, the acceleration / deceleration suppression signal generator 133 detects that the frequency has turned to a lowering direction, such as a frequency change, for a fixed time or a frequency change, regardless of the control time t1 obtained by the above calculation. An acceleration / deceleration suppression control stop unit for stopping S7 is added.
[0033]
As described above, according to this embodiment, the control duration is obtained from the available rotational energy and the controllable active power value, and when the frequency of the power system fluctuates, only the controllable active power value corresponds to the AC excitation type. By increasing or decreasing the active power of the generator motor, that is, by increasing or decreasing the active power of the AC-excited generator motor in accordance with the available rotational energy, the available rotational energy is utilized to the maximum to reduce the frequency fluctuation of the power system. It can be suppressed quickly.
[0034]
Embodiment 3 FIG.
5 and 6 show still another embodiment of the present invention. FIG. 5 is a configuration diagram of a control device of an AC excitation type generator motor, and FIG. 6 is a logic circuit diagram of a condition detector of FIG. is there. In the first and second embodiments described above, a method for adding a signal for acceleration / deceleration suppression to the set value of the control target active power setting unit 13 is shown in FIG. 5 when the acceleration / deceleration suppression control is performed. As described above, the q-axis control is switched to the rotation speed control by the control mode switch 35, and the control target rotation speed Nv is set to the upper limit value or the lower limit value of the operable rotation speed. Within the system, frequency fluctuation suppression control of the power system can be realized. This will be specifically described below.
[0035]
In FIG. 5, the control device of the AC excitation type generator motor 1 is provided with a condition detector 34, a control mode switch 35, a target rotation speed changer 40 as frequency fluctuation suppression means, and a rotation speed deviation detector 41. I have. The condition detector 34 detects that the power system 3 is accelerating or decelerating, and transmits switching signals S9, S10, S11 (details will be described later) to the control mode switch 35 and the target speed changer 40. The control mode switch 35 normally gives the deviation ΔP from the power deviation detector 14 to the q-axis controller 15. When the switching signal S9 is received, the switching is performed so as to give the deviation ΔN of the rotational speed from the rotational speed deviation detector 41 to the q-axis controller 15.
[0036]
The target rotation speed changer 40 stores a target value Nr, a lower limit value Nmin of the operable rotation speed, and an upper limit value Nmax of the operable rotation speed during normal rotation speed control, and responds to the switching signals S10 and S11. One of these values is selected and output to the rotational speed deviation detector 41 as the target rotational speed Nv. The rotational speed deviation detector 41 outputs a deviation ΔN between the target rotational speed Nv and the rotational speed N.
Other configurations are the same as those in the first embodiment shown in FIG. 1, and the corresponding components are denoted by the same reference numerals and description thereof is omitted.
[0037]
The control mode switch 35 is normally switched so as to give the deviation ΔP from the power deviation detector 14 to the q-axis controller 15. Here, the operation of the condition detector 34 will be described with reference to FIG. When the frequency fg of the stator winding voltage of the AC-excited generator motor 1 becomes higher than the frequency fζ, the condition detector 34 outputs a signal S9 to switch the control mode switch 35 to the rotational speed deviation detector 41 and A change command S10 is transmitted to the target speed changer 40 so as to change the target speed to the upper limit Nmax of the operable speed.
[0038]
Conversely, when the frequency fg of the stator winding voltage of the AC-excited generator motor 1 becomes smaller than fη, that is, when the power system decelerates, a signal S9 is issued to cause the control mode switch 35 to rotate the rotational speed deviation. While switching to the detector 41 side, the signal S11 is transmitted, and the target rotation speed changer 40 changes the target rotation speed Nv to the lower limit value Nmin of the rotation speed. Thereby, the upper limit Nmax can be controlled when the power system 3 is accelerating, and the lower limit Nmin can be controlled when the power system 3 is decelerating.
[0039]
That is, control is performed in the direction of decreasing the output of the AC-excited generator motor 1 when the power system is accelerating, and in the direction of increasing the output of the AC-excited generator motor 1 when the power system is decelerating. In addition, frequency fluctuation of the power system can be suppressed.
[0040]
Although the above description has been made with reference to the rotation speed control, the same effect can be obtained with the slip control. In the above description, the q-axis control is controlled based on the deviation ΔP from the power deviation detector 14 before the control mode switching signal S9 is issued. However, the q-axis control is always performed based on the rotation speed or the slip. It may be controlling. In this case, it is not necessary to switch the control mode, and the same effect can be obtained by changing only the rotation speed or the slip target value.
[0041]
In the above description, the target rotational speed Nv is switched to the upper or lower rotational speeds Nmax and Nmin. However, the target rotational speed Nv may be changed according to the rising speed or the decreasing speed of the frequency fg of the stator winding voltage. The same effect can be obtained by changing the value in proportion.
[0042]
Embodiment 4 FIG.
7 to 9 show still another embodiment of the present invention, and FIG. 7 is a configuration diagram of a control device of an AC excitation type generator motor. 8 is a configuration diagram of an excitation frequency switch of the converter control device of FIG. 7, and FIG. 9 is a logic circuit diagram of the frequency switching condition detector of FIG. In the third embodiment, the method of switching to the rotation speed control is described. However, the same effect can be obtained even if the output frequency of the power converter 4, that is, the excitation frequency of the rotor of the AC excitation type generator motor 1 is changed. Can be. FIG. 7 shows a configuration in this case, and the conversion control device 106 has an excitation frequency switch 106a. Further, a frequency switching condition detector 42 is provided. The frequency switching condition detector 42 and the excitation frequency switch 106a are the frequency fluctuation suppressing means in the present invention.
[0043]
The excitation frequency switch 106a in this embodiment is provided instead of the slip frequency controller 6a of the converter control device 6 of FIG. As shown in FIG. 8, the excitation frequency switch 106a has a changeover switch 106b, and can switch the excitation frequency to an actual slip frequency fs1, a minus slip maximum frequency value fs2, and a plus slip maximum frequency value fs3.
[0044]
FIG. 9 shows a logic circuit of the frequency switching condition detector 42 when the frequency fg of the stator winding voltage of the AC-excited generator motor 1 is within a predetermined range (fζ ≧ fg ≧ fη). Transmits a signal S15 for selecting the normal slip frequency control. When the power system is accelerated and the frequency fg of the stator winding voltage of the AC-excited generator motor 1 becomes higher than a predetermined frequency fζ, a signal S16 for selecting the minus slip maximum frequency value fs2 is transmitted. When the power system is decelerated and the frequency fg of the stator winding voltage of the AC-excited generator motor 1 becomes lower than a predetermined frequency fη (where fη <fζ), a signal for selecting the plus slip maximum frequency value fs3. Send S17. The excitation frequency switch 106a receives the signals S15, S16, and S17, and changes the output frequency of the power converter 4.
[0045]
When the frequency of the power converter 4 is set to the minus slip maximum frequency value fs2, the rotational speed of the AC excitation type generator motor 1 increases so as to reach the allowable maximum rotational speed, that is, changes in a direction to reduce the active power. When the plus-slip maximum frequency value fs3 is selected, the opposite occurs. Therefore, similarly to the fourth embodiment, it is possible to suppress the frequency fluctuation of the power system.
[0046]
In the above description, switching of the control value of the output frequency of the power converter 4 to the maximum positive slip frequency value and the maximum negative slip frequency value has been described. However, even if the control value of the output frequency is changed in the direction of the maximum positive slip frequency value or the maximum negative slip frequency value, for example, in proportion to the rising speed or the decreasing speed of the stator frequency, the same applies. Effects can be obtained.
[0047]
Embodiment 5 FIG.
10 to 12 show another embodiment of the present invention. FIG. 10 is a configuration diagram of a control device of an AC excitation type generator motor, and FIG. 11 is a diagram of an acceleration / deceleration suppression signal generator of FIG. It is a block diagram. FIG. 12 is a configuration diagram of a control device for an AC excitation type generator motor different from FIG. In this embodiment, by providing the acceleration / deceleration suppression signal generator 233 shown in FIGS. 10 and 11 instead of the acceleration / deceleration suppression signal generator 33 in FIG. 1, the frequency fluctuation of the power system is quickly converged. is there.
[0048]
As shown in FIG. 11, the acceleration / deceleration suppression signal generator 233 includes a switch control circuit 233a, a deviation detector 233b, a phase correction circuit 233c as frequency fluctuation suppression means, and an open / close switch 233d. The deviation detector 233b outputs a deviation Δf between the rated frequency f0 and the frequency fg of the stator winding voltage Vg of the AC-excited generator motor 1, and outputs a signal obtained by phase-correcting the deviation Δf by a phase correction circuit 233c. , And is supplied to the power deviation detector 14 via the open / close switch 233d.
[0049]
In FIG. 11, the open / close switch 233d is normally open. When the power system accelerates and the frequency fg of the stator winding voltage of the AC-excited generator motor 1 becomes higher than a predetermined frequency fζ, the on / off switch 233d is closed to output the phase-corrected signal S20. It is given to the deviation detector 14 (FIG. 10). Thereby, the q-axis control is changed according to the deviation of the frequency to suppress the frequency fluctuation of the power system.
[0050]
Thereafter, the state in which the frequency fg of the stator winding voltage of the AC excitation type generator motor 1 is lower than a predetermined frequency fθ (however, fθ <fζ, for example, fζ = f0 + Δf5, Δf5 is a predetermined value), and AC excitation When the state in which the frequency fg of the stator winding voltage of the motor generator motor 1 exceeds a predetermined frequency fκ (however, fκ <fη, for example, setting fη = f0 + Δf5, Δf5 is a predetermined value) continues for a predetermined time, It is determined that the transient fluctuation of the power system has converged, and the switch control circuit 233a opens the on / off switch 233d so that the signal S20 is not output to the power deviation detector 14.
[0051]
Similarly, when the power system decelerates and the frequency fg of the stator winding voltage of the AC-excited generator motor 1 becomes lower than a predetermined frequency fη (where fη <f 開 閉), the open / close switch 233d is also closed. The signal S20 having undergone the phase correction is supplied to the power deviation detector 14 (FIG. 10). As a result, the q-axis control is changed according to the frequency deviation to suppress the acceleration / deceleration of the power system.
[0052]
The phase correction takes into account the characteristics of the power system, the control system of the AC-excited generator motor, the time constant of the AC-excited generator motor itself, and the like, and performs control at an optimal timing for suppressing frequency fluctuations of the power system. is there.
[0053]
Further, as shown in FIG. 12, a frequency change rate detector (for example, a differentiator) 44 and a phase corrector 45 can be used in combination. In FIG. 12, a frequency change rate detector 44 detects a change rate of the frequency of the AC excitation type generator motor 1 and inputs the detected change rate to a phase corrector 45, performs a predetermined phase correction on the change rate, and outputs a signal S21. It is configured to add to the power deviation detector 14.
[0054]
For the phase correction, as described above, the rate of change of the frequency of the AC excitation type generator motor 1 or the power system 3 may be directly input to the phase correction circuit 45, or the rated frequency f0 and the AC excitation type generator motor 1 The deviation from the frequency fg of the stator winding voltage or the frequency of the power system 3 may be phase corrected.
In this embodiment, the same effect can be obtained by controlling the rotation speed or the slip frequency of the AC-excited generator motor 1 instead of controlling the active power.
As described above, even when the fluctuation due to the acceleration / deceleration of the power system continues for a long time, the acceleration / deceleration of the power system can be quickly converged, and the stability of the power system can be improved.
[0055]
Embodiment 6 FIG.
FIG. 13 is a configuration diagram of a control device of an AC excitation type generator motor showing still another embodiment of the present invention. In the fifth embodiment, an example in which the acceleration and deceleration of the power system are continuously suppressed has been described. However, in the case of these methods, if the gain of the phase correction circuit 233c (FIG. 11) and the phase corrector 45 is set too large, the output of the AC excitation type generator motor 1 will be largely changed even with a small frequency fluctuation, and Unwanted frequency changes of the system may occur, and the gain cannot be set to a very large value.
[0056]
For this reason, the power of suppressing the first wave when the fluctuation of the power system is large may be insufficient. In such a case, a frequency change rate detector 44 and a phase corrector 45 are provided as shown in FIG. Then, the signal S21 whose phase has been corrected by the phase corrector 45 as the frequency fluctuation suppressing means is added to the power deviation detector 14. With this configuration, it is possible to suppress frequency fluctuations in a wide range of the power system from a large fluctuation of the power system to an improvement in convergence after the large fluctuation has subsided.
[0057]
It should be noted that a switch is provided for performing the suppression control by the acceleration / deceleration suppression control signal generator 33 shown in FIG. 1 on the first wave of the oscillation, and thereafter switching to the suppression control by the phase corrector 45 shown in FIG. However, the same effect can be obtained.
[0058]
Embodiment 7 FIG.
FIG. 14 is a configuration diagram of a control device for an AC excitation type generator motor showing still another embodiment of the present invention. In the first and second embodiments, the case where the suppression signal for suppressing the acceleration or deceleration of the power system is continued during the time obtained from the rotational energy or the like has been described. However, for example, if this control is continued even after the power system 3 enters the deceleration range during the acceleration suppression control of the power system, the deceleration is expanded.
[0059]
In this embodiment, a suppression control canceller 46 is provided as shown in FIG. The suppression control canceller 46 obtains the frequency fg of the stator winding voltage of the AC excitation type generator motor 1 from the frequency detector 30, and determines the absolute value | fg-f0 | of the difference between the frequency fg and the rated frequency f0. When the value falls below the value Δf2, the signal S6 from the acceleration / deceleration suppression controller 33 is cut off to cancel the suppression control. As described above, by detecting that the frequency fg of the stator winding voltage of the AC-excited generator motor 1 has returned to the vicinity of the rated frequency as a result of the acceleration suppression control, and canceling the suppression control, the excessive The suppression control can be prevented.
[0060]
In this embodiment, the control device of the embodiment shown in FIG. 1 is provided with the suppression control canceler 46, but the control device of the second to sixth embodiments is provided with the suppression control canceler 46. The same effect can be obtained.
[0061]
Embodiment 8 FIG.
15 and 16 show still another embodiment of the present invention. FIG. 15 is a configuration diagram of a control device of an AC excitation type generator motor, and FIG. 16 is a configuration diagram of an active power limiter. The AC-excited generator-motor 1 has an operable output range, and in the acceleration / deceleration suppression control in each of the above-described first to seventh embodiments, there is a possibility that the operating state will exceed the operable output range. There is. This embodiment is intended to prevent this.
[0062]
In FIG. 15, the control device of the AC-excited generator motor 1 is provided with an active power limiter 48 for controlling the q-axis control device 15 based on the active power Pg detected by the active power detector 12. Is transmitted. The q-axis control device 15 controls the power of the AC-excited generator motor 1 according to the control signal S31. As shown in FIG. 16, the active power limiter 48 has an upper limit deviation detector 48a, a lower limit deviation detector 48b, a high value selector 48c, and a low value selector 48d. The active power limiter 48 receives the deviation ΔP from the voltage deviation detector 14 and the active power pg from the active power detector 12.
[0063]
The upper limit deviation detector 48a calculates a deviation ΔP1 between the active power pg from the active power detector 12 and the upper limit value Pmax of the operable active power of the AC-excited generator motor 1. The lower limit deviation detector 48b obtains a deviation ΔP2 between the active power pg from the active power detector 12 and the lower limit Pmax of the operable active power of the AC-excited generator motor 1.
[0064]
The high value selector 48c compares the deviation ΔP with the deviation ΔP2, and outputs the higher value to the low value selector 48d. The low value selector 48d compares the output from the high value selector 48c with the deviation ΔP1, selects the lower value, and outputs the lower value to the q-axis controller 15 as a control signal S31. The q-axis control device 15 controls the active power of the AC-excited generator motor 1 based on the control signal S31.
[0065]
Thereby, when the AC excitation type generator motor 1 is operated between the upper limit value Pmax and the lower limit value Pmin of the active power, both the high value selector 48c and the low value selector 48d select the deviation ΔP. , The deviation ΔP is output as it is as the control signal S31. If active power Pg of AC-excited generator motor 1 is greater than Pmax, deviation ΔP1 between active power and upper limit Pmax is minus (negative), and deviation ΔP2 between active power Pg and lower limit Pmin is also minus ( Negative). On the other hand, since the active power Pg is increasing, the deviation ΔP is positive in the direction of increasing the active power, and the higher value selector 48c selects the higher value deviation ΔP.
[0066]
In the low value selector 48d, a deviation ΔP1 between the active power Pg, which is the lower value, and the upper limit value Pmax is selected. Accordingly, the deviation ΔP1 is selected as the control signal S31, and the control is performed in a direction to suppress the active power. Eventually, the deviation is zero, that is, the active power reaches the upper limit value Pmax. Further, when the active power Pg of the AC-excited generator motor 1 becomes smaller than the lower limit value Pmin, the deviation ΔP2 is output as the control signal S31. Then, the active power is controlled to increase, and finally the active power is restored to the lower limit Pmin.
As described above, the AC-excited generator motor 1 can be prevented from operating beyond the allowable range.
[0067]
In this embodiment, the output of the active power is limited without the time characteristic according to the magnitude of the active power Pg. However, in order to effectively utilize the overload withstand capability of the AC-excited generator motor 1. It may be one having a timed characteristic so as to allow a predetermined amount of overload for a predetermined time. In addition, a limit control method in which stator current is controlled instead of active power, a method in which d and q axes are limited in consideration of reactive power in addition to active power, or an AC-excited generator motor 1 can be operated. It is also possible to adopt a system in which the rotation speed is controlled so that the operation is performed in a suitable rotation speed range.
[0068]
In this embodiment, the active power limiter 48 is provided in the control device of the embodiment of FIG. 1, but the active power limiter 48 may be provided in the embodiments shown in the second to seventh embodiments. A similar effect is achieved.
[0069]
Embodiment 9 FIG.
FIG. 17 is a configuration diagram of a prime mover controller showing still another embodiment of the present invention. In FIG. 17, a motor controller 50 as a frequency adjustment control unit includes a frequency deviation detector 50a and a motor output increase / decrease signal transmitter 50b. In each of the above embodiments, the method of suppressing the acceleration / deceleration of the power system 3 has been described. However, after the acceleration / deceleration of the power system has converged, the supply / demand balance of the power system is disrupted. The frequency is lower when the load (demand) is larger than the power supply (supply), and the frequency is higher and stable when the load is higher. When a prime mover such as a pump turbine is connected to the AC excitation type generator motor 1, a prime mover controller 50 (an example of a power generation direction) shown in FIG. 17 is provided to control the output.
[0070]
The prime mover controller 50 obtains the deviation Δf between the rated frequency f0 and the frequency fg of the stator winding voltage of the AC excitation type generator motor 1 by the frequency deviation detector 50a, and gives it to the prime mover output increase / decrease signal transmitter 50b. The motor output increase / decrease signal transmitter 50b outputs a motor output increase signal S41 when the deviation Δf becomes larger than a predetermined value λ, and outputs a motor output reduction signal S42 when the deviation Δf becomes smaller than (−λ). The output of a prime mover (not shown) is controlled. As a result, the input of the AC-excited generator motor 1 can be adjusted, and the collapse of the supply and demand balance can be compensated within the range of the capability.
[0071]
Embodiment 10 FIG.
FIG. 18 is a configuration diagram of a prime mover controller showing still another embodiment of the present invention. In FIG. 18, a prime mover controller 51 as a slip value adjusting control means has a slip value detector 51a and a prime mover output increase / decrease signal transmitter 51b. After the acceleration / deceleration of the power system 3 converges, as a result of controlling to maintain the supply-demand balance of the power system as much as possible, the AC-excited generator motor 1 may be in an operating state at the upper limit or the lower limit of the variable frequency. In the case of operation in this state, when acceleration or deceleration occurs in the electric power system next, either acceleration or deceleration suppression control cannot be performed. Therefore, in this embodiment, in order to prevent such a situation, when a prime mover such as a pump turbine is connected to the AC-excited generator motor 1, the prime mover controller shown in FIG. Example) 51 is added.
[0072]
The motor controller 51 obtains a slip value S from the frequency fg of the stator winding voltage of the AC excitation type generator motor 1 and the rotation speed N by the slip detector 51a, and gives the slip value S to the motor output increase / decrease signal transmitter 51b. The prime mover output increase / decrease signal transmitter 51b outputs a prime mover output increase signal S43 when the slip value S becomes larger than a predetermined value Spm, and outputs a prime mover output decrease signal S44 when the slip value S becomes smaller than (-Spm). The output of a prime mover (not shown) is controlled. This makes it possible to adjust the input of the AC-excited generator motor 1 and control the AC-excited generator motor 1 to operate within its variable frequency limit within its capability. When the predetermined value Spm is set to, for example, the slip value of the control target during normal operation, the output of the prime mover is controlled so that the slip value becomes the slip value of the control target.
[0073]
Embodiment 11 FIG.
FIG. 19 is a configuration diagram of a prime mover controller showing still another embodiment of the present invention. This embodiment has the functions of both a prime mover controller 50 for controlling the frequency shown in FIG. 17 and a prime mover controller 51 for controlling the slip value shown in FIG. In FIG. 19, a motor controller 54 as a frequency and slip value adjustment control means includes a frequency deviation detector 50a, a motor output increase / decrease signal transmitter 50b, a slip detector 51a, a motor output increase / decrease signal transmitter 51b, and an OR circuit 54a. , 54b.
[0074]
The OR circuit 54a issues a motor output increase signal S45 when the deviation Δf becomes larger than a predetermined value λ or the slip value S becomes larger than a predetermined value Spm, and increases the output of the motor. When the deviation Δf is smaller than (−λ) or when the slip value S is smaller than (−Spm), the OR circuit 54b issues a signal S45 of a motor output decrease to reduce the output of the motor. Within the range of the capacity of the AC-excited generator motor 1, it is possible to maintain the frequency of the power system and the ability to control acceleration / deceleration for the frequency fluctuation of the power system that occurs continuously.
[0075]
In the first to eighth embodiments, the driving device of the AC-excited generator motor 1 is not described, but the present invention relates to a system in which the driving device is a prime mover / rotary load such as a water turbine / pump or a synchronous phase shifter. As described above, the present invention can be applied to any of the systems having no driving device, and the same effect is obtained in any of them.
[0076]
【The invention's effect】
As described above, the control apparatus for an AC excitation type generator motor according to the present invention is an AC excitation type generator motor in which a stator winding is connected to a power system and a rotor winding is connected to a variable frequency power converter. Frequency generator for controlling the frequency of the stator winding voltage, rotation number detector for detecting the number of rotations of the AC excitation type generator motor, and operation of the AC excitation type generator motor. Means for determining the available rotational energy of the AC-excited generator motor based on the upper and lower limit values of the possible rotational speed and the rotational speed, and the AC-excited type via a power converter according to the available rotational energy. Frequency fluctuation suppressing means for suppressing the frequency fluctuation of the power system by controlling the active power of the generator motor,
Obtain available rotational energy and, when the frequency of the power system fluctuates, quickly suppress the frequency fluctuation of the power system by controlling the active power of the AC excitation generator motor according to the available rotational energy. Can be.
[0077]
The stator winding is connected to a power system, and the rotor winding controls an AC-excited generator motor connected to a variable frequency power converter, and the frequency of the stator winding voltage is controlled. Frequency detecting means for detecting the rotation speed of the AC excitation type generator motor, and the rotation speed detection means for detecting the rotation speed of the AC excitation type generator motor. Frequency fluctuation suppression means for controlling the frequency of the AC-excited generator motor via the power converter so as to be at the upper limit value or the lower limit value of the operable speed, thereby suppressing frequency fluctuation of the power system. Because
By increasing or decreasing the active power of the AC-excited generator motor so that the rotational speed of the AC-excited generator motor becomes the upper limit or the lower limit of the operable rotational speed, it is possible to quickly suppress the fluctuation of the frequency of the power system. it can.
[0078]
Further, the stator winding is connected to a power system and the rotor winding controls an AC excitation type generator motor connected to a variable frequency power converter, and the frequency of the stator winding voltage is controlled. Frequency detection means for detecting the rotation speed of the AC excitation type generator motor, rotation speed detection means, and means for determining the slip frequency from the frequency and the rotation speed of the stator winding voltage of the AC excitation type generator motor, The power converter is controlled so that the slip frequency becomes the upper limit or lower limit of the exciting frequency of the rotor of the AC excitation generator motor in accordance with the frequency fluctuation of the stator winding voltage of the AC excitation generator motor. Since it is provided with frequency fluctuation suppressing means for controlling the frequency fluctuation of the power system by controlling the output frequency,
Suppressing fluctuations in the frequency of the power system quickly by controlling the output frequency of the power converter so that the slip frequency becomes the upper limit or lower limit of the exciting frequency of the rotor of the AC excitation generator motor that can be excited. Can be.
[0079]
In addition, the stator winding is connected to a power system and the rotor winding controls an AC excitation type generator motor connected to a variable frequency power converter, and the frequency of the stator winding voltage is controlled. And a frequency deviation between the frequency of the stator winding voltage of the AC excitation type generator motor and a predetermined reference frequency or a change in the frequency of the stator winding voltage of the AC excitation type generator motor. Phase correction means for detecting the rate and correcting the predetermined phase, and a phase deviation or a rate of change of the phase-corrected frequency in accordance with the fluctuation of the frequency of the voltage of the stator winding of the AC-excited generator motor. Frequency fluctuation suppressing means for suppressing the frequency fluctuation of the power system by controlling the active power or the rotation speed or the slip frequency of the AC excitation type generator motor via the power converter based on
By controlling the active power, the rotational speed, or the slip frequency of the AC-excited generator motor based on the phase corrected frequency deviation or the rate of change of the frequency, fluctuations in the frequency of the power system can be quickly suppressed.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a control device for an AC excitation type generator motor according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of an acceleration / deceleration suppression signal generator of FIG. 1;
FIG. 3 is a configuration diagram of a control device for an AC excitation type generator motor according to another embodiment of the present invention.
FIG. 4 is a configuration diagram of an acceleration / deceleration suppression signal generator of FIG. 3;
FIG. 5 is a configuration diagram of a control device of an AC excitation type generator motor according to another embodiment of the present invention.
FIG. 6 is a logic circuit diagram of the condition detector of FIG. 5;
FIG. 7 is a configuration diagram of a control device for an AC excitation type generator motor according to another embodiment of the present invention.
FIG. 8 is a configuration diagram of an excitation frequency switch of the converter control device of FIG. 7;
FIG. 9 is a logic circuit diagram of the frequency switching condition detector of FIG. 7;
FIG. 10 is a configuration diagram of a control device for an AC excitation generator motor according to another embodiment of the present invention.
11 is a logic circuit and configuration diagram of the acceleration / deceleration suppression signal generator of FIG.
12 is a configuration diagram of a control device of an AC excitation type generator motor different from the control device of FIG. 10;
FIG. 13 is a configuration diagram of a control device for an AC excitation type generator motor showing another embodiment of the present invention.
FIG. 14 is a configuration diagram of a control device of an AC excitation type generator motor according to another embodiment of the present invention.
FIG. 15 is a configuration diagram of a control device for an AC excitation type generator motor according to another embodiment of the present invention.
16 is a configuration diagram of the active power limiter of FIG.
FIG. 17 is a configuration diagram of a prime mover controller showing still another embodiment of the present invention.
FIG. 18 is a configuration diagram of a prime mover controller showing still another embodiment of the present invention.
FIG. 19 is a configuration diagram of a prime mover controller showing still another embodiment of the present invention.
[Explanation of symbols]
1 AC excitation generator motor, 3 power system, 4 power converter,
6 converter control device, 7 phase and rotation speed detector, 8 voltage detector,
9 control target voltage setter, 10 voltage deviation detector, 11 d-axis controller,
12 active power detector, 13 control target active power setting device,
14 power deviation detector, 15 q-axis controller, 30 frequency detector,
31 current detector, 33 acceleration / deceleration suppression signal generator,
33a an acceleration / deceleration occurrence suppression command signal transmitting means,
33c available rotational energy calculating means, 33e control duration setting means,
33f active power calculation means, 33g suppression signal generation means, 34 condition detector,
35 control mode switch, 40 target speed changer, 41 speed deviation detector,
42 frequency switching condition detector, 44 frequency change rate detector, 45 phase corrector,
46 suppression control canceller, 48 active power limiter,
50, 51, 54 prime mover controller, 106 converter controller,
106a excitation frequency switcher, 133 acceleration / deceleration suppression signal generator,
133f controllable active power calculation means, 133e control duration calculation means,
133g suppression signal generation means, 233 acceleration / deceleration suppression signal generator,
233c Phase correction circuit.

Claims (11)

A stator winding is connected to a power system and a rotor winding controls an AC excitation type generator motor connected to a variable frequency power converter,
Frequency detection means for detecting the frequency of the voltage of the stator winding,
Rotation speed detecting means for detecting the rotation speed of the AC excitation type generator motor,
Means for determining the available rotational energy of the AC-excited generator motor based on the upper limit value and the lower limit value of the operable rotational speed of the AC-excited generator motor and the rotational speed;
Frequency fluctuation suppressing means for suppressing the frequency fluctuation of the power system by controlling the active power of the AC excitation generator motor via the power converter according to the available rotational energy,
A control device for an AC-excited generator motor equipped with: The frequency fluctuation suppressing means increases or decreases the active power of the AC excitation generator motor by a possible control amount of the active power of the AC excitation generator motor obtained from the available rotational energy and a predetermined suppression duration. 2. The control device for an AC-excited generator motor according to claim 1, wherein: The frequency fluctuation suppressing unit is configured to control the effective frequency of the AC-excited generator motor by the controllable active power value obtained based on the maximum and minimum values of the operable active power of the AC-excited generator motor and the current active power. The control device for an AC-excited generator motor according to claim 1, wherein the control device increases or decreases electric power. A stator winding is connected to a power system and a rotor winding controls an AC excitation type generator motor connected to a variable frequency power converter,
Frequency detection means for detecting the frequency of the voltage of the stator winding,
Rotation speed detecting means for detecting the rotation speed of the AC excitation type generator motor,
Through the power converter so as to reach the upper limit or lower limit of the operable rotation speed of the AC excitation type generator motor according to the fluctuation of the frequency of the voltage of the stator winding of the AC excitation type generator motor. Frequency fluctuation suppressing means for suppressing the frequency fluctuation of the power system by controlling the rotation speed of the AC excitation type generator motor,
A control device for an AC-excited generator motor equipped with: A stator winding is connected to a power system and a rotor winding controls an AC excitation type generator motor connected to a variable frequency power converter,
Frequency detection means for detecting the frequency of the voltage of the stator winding,
Rotation speed detecting means for detecting the rotation speed of the AC excitation type generator motor,
Means for determining the slip frequency from the frequency of the stator winding voltage of the AC excitation type generator motor and the rotation speed,
The slip frequency is set so as to be the upper limit value or the lower limit value of the excitation frequency at which the rotor of the AC excitation type generator motor can be excited according to the variation in the frequency of the voltage of the stator winding of the AC excitation type generator motor. Frequency fluctuation suppressing means for suppressing the frequency fluctuation of the power system by controlling the output frequency of the power converter,
A control device for an AC-excited generator motor equipped with: A stator winding is connected to a power system and a rotor winding controls an AC excitation type generator motor connected to a variable frequency power converter,
Frequency detection means for detecting the frequency of the voltage of the stator winding,
A frequency deviation between the frequency of the stator winding voltage of the AC excitation type generator motor and a predetermined reference frequency or a change rate of the frequency of the stator winding voltage of the AC excitation type generator motor is detected and determined. Phase correction means for correcting the phase of
The AC excitation type through the power converter based on the phase-corrected frequency deviation or the rate of change of the phase-corrected frequency according to the variation in the frequency of the voltage of the stator winding of the AC-excited generator motor. Frequency fluctuation suppressing means for suppressing the frequency fluctuation of the power system by controlling the active power or rotation speed or slip frequency of the generator motor,
A control device for an AC-excited generator motor equipped with: Suppressing operation canceling means for canceling the operation of the frequency fluctuation suppressing means when the deviation between the frequency of the stator winding voltage of the AC excitation type generator motor and the rated frequency of the power system is equal to or less than a predetermined value is provided. The control device for an AC excitation type generator motor according to any one of claims 1 to 6, wherein the control device is a motor. 7. An apparatus according to claim 1, further comprising output limiting means for limiting the active power of said AC excitation generator motor so as not to exceed the output limit of the active power of said AC excitation generator motor. The control device for an AC-excited generator motor according to any one of the preceding claims. The AC-excited generator motor is connected to a prime mover or a rotating load, and after a predetermined time after the operation of the frequency fluctuation suppressing means, the frequency of the stator winding voltage of the AC-excited generator motor and the power system When the deviation from the rated frequency of the motor is not less than a predetermined value, the output frequency of the prime mover or the magnitude of the rotating load is changed to change the frequency of the stator winding voltage of the AC excitation type generator motor and the rated frequency of the power system. 7. An AC-excited generator motor according to claim 1, further comprising a frequency adjustment control means for causing a deviation from the predetermined value to be less than the predetermined value. Control device. The AC-excited generator motor is connected to a prime mover or a rotating load, and the slip value of the AC-excited generator motor is an upper limit or a lower limit of an allowable slip value range after a predetermined time after the operation of the frequency fluctuation suppressing means. When the value is a value, a slip value adjusting control means for changing the output of the prime mover or the magnitude of the rotational load so that the slip value is smaller than the upper limit value and larger than the lower limit value is provided. The control apparatus for an AC excitation type generator motor according to any one of claims 1 to 6, wherein The AC-excited generator motor is connected to a prime mover or a rotating load, and after a predetermined time after the operation of the frequency fluctuation suppressing means, the frequency of the stator winding voltage of the AC-excited generator motor and the power system When the deviation from the rated frequency of the motor is equal to or greater than a predetermined value and the slip value of the AC-excited generator motor is the upper limit value or the lower limit value of the allowable slip value range, the output of the prime mover or the magnitude of the rotational load is changed. Frequency control means for controlling the deviation between the frequency of the stator winding voltage of the AC excitation type generator motor and the rated frequency of the power system to be less than the predetermined value, and the slip value is higher than the upper limit value. The AC excitation according to any one of claims 1 to 6, further comprising a slip value adjusting control means for making the slip value smaller than the lower limit value. The control device of the generator motor.

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