JPH10108367A - Voltage reactive power controller - Google Patents
Voltage reactive power controllerInfo
- Publication number
- JPH10108367A JPH10108367A JP8277327A JP27732796A JPH10108367A JP H10108367 A JPH10108367 A JP H10108367A JP 8277327 A JP8277327 A JP 8277327A JP 27732796 A JP27732796 A JP 27732796A JP H10108367 A JPH10108367 A JP H10108367A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- reactive power
- control device
- capacitor
- power control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 98
- 230000005540 biological transmission Effects 0.000 abstract description 26
- 230000007257 malfunction Effects 0.000 abstract description 5
- 230000001681 protective effect Effects 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は送電線のリアクタン
スを等価的に低減し、送電限界電力を増大させる電圧無
効電力制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage reactive power control device for reducing the reactance of a transmission line equivalently and increasing the transmission limit power.
【０００２】[0002]
【従来の技術】図３は一般の電力系統１を示し、電源２
に送電線３のリアクタンスＸｓと直列コンデンサ４のリ
アクタンス（−Ｘｃ）と変圧器５が接続され、更に変圧
器５の相手端には負荷６が接続されると共に、制御対象
外コンデンサ７が接続されている。又、送電線には検出
手段８を介して負荷電流Ｉｒ，負荷無効電力Ｑｒ，受電
端電圧Ｖｒを検出する構成を有している。BACKGROUND OF THE INVENTION Figure 3 shows a general power system 1, power supply 2
The transformer 5 is connected to the reactance Xs of the transmission line 3, the reactance (−Xc) of the series capacitor 4, and the load 6 is connected to the other end of the transformer 5, and the non-controllable capacitor 7 is connected to the transformer 5. ing. Further, the transmission line has a configuration for detecting the load current Ir, the load reactive power Qr, and the receiving end voltage Vr via the detecting means 8.
【０００３】図３の直列コンデンサ４は送電限界電力を
増大するために設けたものであり、送電線に直列コンデ
ンサを直列に挿入することにより、送電線のリアクタン
スを低減させるものである。そして図４はこのときの需
要−受電端電圧曲線は（Ｐ−Ｖ曲線）である。図４にお
いて、縦軸は受電端電圧Ｖｒ（ｐｕ）を、又、横軸は需
要電力Ｐ２（ｐｕ）を示す。The series capacitor 4 shown in FIG. 3 is provided to increase the transmission power limit, and reduces the reactance of the transmission line by inserting a series capacitor in series with the transmission line. FIG. 4 shows a demand-power receiving end voltage curve at this time (PV curve). In FIG. 4, the vertical axis represents the receiving end voltage Vr (pu), and the horizontal axis represents the demand power P2 (pu).
【０００４】図４からわかるように、曲線の先端が与え
る需要限界のうち運用電圧以下で運用可能な運用限界需
要は伸びる。又、曲線の先端より上側では需要が増える
と電圧が下がる系統特性となり、電圧が下がれば逆に需
要が減るので落ちつく点があって安定な運転ができる
が、曲線の先端より下側では需要が減ると電圧が下がる
系統特性となり、電圧が下がれば更に需要が減るので落
ちつく点がなく安定な運転ができない。図５は他の送電
限界電力の増大方式であり、この場合は並列コンデンサ
７で受電端の電圧を増大させるものである。[0004] As can be seen from FIG. 4, of the demand limit given by the tip of the curve, the operation limit demand that can be operated at an operation voltage or less increases. In addition, above the top of the curve, when the demand increases, the voltage decreases when the demand increases, and when the voltage decreases, the demand decreases.Therefore, there is a calm point and stable operation can be performed. If the voltage decreases, the voltage will decrease, and if the voltage decreases, the demand will further decrease. FIG. 5 shows another method of increasing the power transmission limit power. In this case, the voltage at the power receiving end is increased by the parallel capacitor 7.
【０００５】[0005]
【発明が解決しようとする課題】上記した従来方式にお
いて、直列コンデンサを用いる方式は線路保護リレーの
誤動作，発電機軸振動との共振などの問題に対する対策
が必要であり、余り使用されていない。又、並列コンデ
ンサ方式は、図６に示されるように、コンデンサ容量を
増大させれば曲線の先端が与える送電限界は伸びるが、
限界電圧が上昇してしまうために、運用可能な送電限界
は伸びないことが予想される。即ち、この送電限界電圧
の抑制が課題であった。In the above-mentioned conventional system, the system using a series capacitor requires measures against problems such as malfunction of the line protection relay and resonance with the vibration of the generator shaft, and is not used much. Further, in the parallel capacitor method, as shown in FIG. 6, the power transmission limit given by the tip of the curve increases as the capacitance of the capacitor increases,
It is expected that the operable transmission limit will not increase because the threshold voltage will increase. That is, suppression of the power transmission limit voltage has been a problem.
【０００６】本発明は上記課題を解決するためになされ
たものであり、送電限界電圧の上昇を抑制しながら、直
列コンデンサで問題となる線路保護リレーの誤動作対
策，発電機軸振動との共振対策を不要とし、送電線のリ
アクタンスを等価的に低減することにより、運用限界需
要を増大させることの可能な電圧無効電力制御装置を提
供することを目的としている。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended to prevent a malfunction of a line protection relay, which is a problem with a series capacitor, and a countermeasure against resonance with a generator shaft vibration, while suppressing an increase in a power transmission limit voltage. It is an object of the present invention to provide a voltage reactive power control device capable of increasing the operation limit demand by making the reactance of a transmission line equivalent and reducing the reactance of a transmission line.
【０００７】[0007]
【課題を解決するための手段】本発明の請求項１に係る
電圧無効電力制御装置は、電力系統に１次側を接続され
るタップ付き変圧器と、そのタップ付き変圧器の２次側
に接続される並列コンデンサと、電力系統からの負荷電
流を入力とする制御部とを備え、前記制御部には仮想の
直列コンデンサを前記負荷電流が通過したときに発生す
る無効電力と等価な無効電力を発生するように、前記並
列コンデンサの端子電圧目標値を定める手段と、前記並
列コンデンサの端子電圧を前記目標値に維持するように
タップを調整する手段とを備えた。According to a first aspect of the present invention, there is provided a voltage reactive power control apparatus comprising: a tapped transformer having a primary side connected to a power system; A parallel capacitor connected thereto, and a control unit that receives a load current from a power system as an input, wherein the control unit has a reactive power equivalent to a reactive power generated when the load current passes through a virtual series capacitor. Means for determining a terminal voltage target value of the parallel capacitor, and means for adjusting a tap so as to maintain the terminal voltage of the parallel capacitor at the target value.
【０００８】この場合のタップ調整は、端子電圧を検出
しこれを目標値と比較し、目標値よりも低い場合には端
子電圧を上げる方向にタップを変更し、又、目標値より
も高い場合には端子電圧を下げる方向にタップを変更す
ることで行なわれる。In the tap adjustment in this case, the terminal voltage is detected and compared with a target value. If the terminal voltage is lower than the target value, the tap is changed in a direction to increase the terminal voltage, and if the terminal voltage is higher than the target value. Is performed by changing the tap in a direction to lower the terminal voltage.
【０００９】本発明の請求項２に係る電圧無効電力制御
装置は、請求項１において、電圧目標値を定める手段
が、検出した負荷電流Ｉｒと、仮想の直列コンデンサの
リアクタンスＸｃと並列コンデンサのサセプタンスをＹ
ｃｄとしたとき下式According to a second aspect of the present invention, there is provided the voltage reactive power control device according to the first aspect, wherein the means for determining the voltage target value includes the detected load current Ir, the reactance Xc of the virtual series capacitor, and the susceptance of the parallel capacitor. Is Y
The following formula when cd
【数１】 で算出される電圧Ｖを目標電圧とする手段であるように
した。(Equation 1) Is a means for setting the voltage V calculated in the above as a target voltage.
【００１０】本発明の請求項３に係る電圧無効電力制御
装置は、請求項１において、電圧目標値を定める手段
が、検出した負荷電流Ｉｒと負荷無効電力Ｑｒと制御対
象以外で投入されている並列コンデンサの容量Ｙｃと、
設定した直列コンデンサのリアクタンスＸｃと制御対象
並列コンデンサのサセプタンスをＹｃｄとしたとき下式According to a third aspect of the present invention, there is provided a voltage reactive power control apparatus according to the first aspect, wherein the means for determining a voltage target value is supplied to a device other than the detected load current Ir, the load reactive power Qr, and the control target. The capacitance Yc of the parallel capacitor,
When the reactance Xc of the set series capacitor and the susceptance of the parallel capacitor to be controlled are Ycd,
【数２】 で算出される電圧Ｖを目標電圧とする手段であるように
した。(Equation 2) Is a means for setting the voltage V calculated in the above as a target voltage.
【００１１】本発明の請求項４に係る電圧無効電力制御
装置は、請求項１において、電圧目標値を定める手段
が、検出した負荷電流Ｉｒと、検出した電圧Ｖｒと、仮
想の直列コンデンサのリアクタンスＸｃと並列コンデン
サのサセプタンスをＹｃｄとしたとき下式According to a fourth aspect of the present invention, there is provided the voltage reactive power control apparatus according to the first aspect, wherein the means for determining the voltage target value includes the detected load current Ir, the detected voltage Vr, and the virtual series capacitor reactance. When the susceptance of Xc and the parallel capacitor is Ycd,
【数３】 で算出されるＮをタップ比の目標値とする手段であるよ
うにした。(Equation 3) Is a means for setting N calculated in the above as a target value of the tap ratio.
【００１２】本発明の請求項５に係る電圧無効電力制御
装置は、請求項１において、電圧目標値を定める手段
が、検出した負荷電流Ｉｒと負荷無効電力Ｑｒと操作対
象の並列コンデンサ以外に投入されている並列コンデン
サの容量Ｙｃと、設定した直列コンデンサのリアクタン
スＸｃと並列コンデンサのサセプタンスをＹｃｄとした
とき下式According to a fifth aspect of the present invention, there is provided a voltage reactive power control apparatus according to the first aspect, wherein the means for determining a voltage target value inputs the detected load current Ir, the load reactive power Qr, and the parallel capacitor other than the operation target parallel capacitor. Assuming that the capacitance Yc of the parallel capacitor, the reactance Xc of the set series capacitor, and the susceptance of the parallel capacitor are Ycd,
【数４】 で算出されるＮをタップ比の目標値とする手段であるよ
うにした。(Equation 4) Is a means for setting N calculated in the above as a target value of the tap ratio.
【００１３】本発明の請求項６に係る電圧無効電力制御
装置は、請求項１において、タップ付き変圧器の２次側
に接続されるのが、並列リアクトルとした。According to a sixth aspect of the present invention, in the voltage reactive power control apparatus according to the first aspect, the parallel reactor is connected to the secondary side of the tapped transformer.
【００１４】本発明の請求項７に係る電圧無効電力制御
装置は、請求項１又は請求項６において、タップ付き変
圧器の２次側に接続されるのが、開閉装置で開閉される
複数の並列コンデンサ又は並列リアクトルとした。According to a seventh aspect of the present invention, there is provided a voltage reactive power control device according to the first or sixth aspect, wherein the secondary side of the transformer with a tap is connected to a plurality of switches that are opened and closed by an opening and closing device. A parallel capacitor or a parallel reactor was used.
【００１５】本発明の請求項８に係る電圧無効電力制御
装置は、請求項１において、タップ付き変圧器の２次側
に接続されるのが、開閉装置で開閉される複数の並列コ
ンデンサ及び並列リアクトルとした。In a voltage reactive power control device according to an eighth aspect of the present invention, in the first aspect, the secondary side of the tapped transformer is connected to a plurality of parallel capacitors and a parallel capacitor that are opened and closed by a switchgear. Reactor.
【００１６】本発明の請求項９に係る電圧無効電力制御
装置は、請求項１又は請求項６において、タップ付き変
圧器の３次側に並列コンデンサあるいは並列リアクトル
を接続した。According to a ninth aspect of the present invention, in the voltage reactive power control apparatus according to the first or sixth aspect, a parallel capacitor or a parallel reactor is connected to a tertiary side of the transformer with a tap.
【００１７】本発明の請求項１０に係る電圧無効電力制
御装置は、請求項１において、負荷電流が通過するのが
仮想のリアクトルであるようにした。According to a tenth aspect of the present invention, in the first aspect, the load current passes through a virtual reactor.
【００１８】[0018]
【発明の実施の形態】図１は本発明の第１の実施の形態
を示す電圧無効電力制御装置である。図１において図３
と同一部分については同一符号を付して説明を省略す
る。本実施の形態における構成上の特徴点は、１次側が
電力系統１の電源２側に接続されるタップ付き変圧器９
と、そのタップ付き変圧器の２次側に接続される並列コ
ンデンサ10と、そのタップを調整する制御部11とを付加
したことである。FIG. 1 shows a voltage reactive power control device according to a first embodiment of the present invention. In FIG. 1, FIG.
The same parts as those described above are denoted by the same reference numerals and description thereof is omitted. The feature of the configuration in the present embodiment is that a transformer 9 with a tap whose primary side is connected to the power supply 2 side of the power system 1
And a parallel capacitor 10 connected to the secondary side of the transformer with taps, and a control unit 11 for adjusting the taps.
【００１９】次に動作を説明する。制御部11では負荷電
流を検出し、設定した仮想の直列コンデンサをその負荷
電流が通過したときに発生する無効電力と等価な無効電
力を発生するように並列コンデンサ10の端子電圧目標値
を定め、その端子電圧を目標値に維持するようにタップ
を調整する。Next, the operation will be described. The control unit 11 detects the load current and determines a terminal voltage target value of the parallel capacitor 10 so as to generate a reactive power equivalent to a reactive power generated when the load current passes through the set virtual series capacitor, The tap is adjusted so that the terminal voltage is maintained at the target value.
【００２０】タップの調整は、検出した端子電圧を目標
値と比較し、これが目標値よりも低い場合には端子電圧
を上げる方向にタップを変更し、目標値よりも高い場合
には端子電圧を下げる方向にタップを変更することで行
なわれる。In the tap adjustment, the detected terminal voltage is compared with a target value, and if the detected terminal voltage is lower than the target value, the tap is changed in a direction to increase the terminal voltage. If the detected terminal voltage is higher than the target value, the terminal voltage is changed. This is performed by changing the tap in the downward direction.
【００２１】図２は図１に示す電圧無効電力制御装置の
特性図（Ｐ−Ｖ曲線）である。そして図２は図４に示さ
れる直列コンデンサとほゞ等価な曲線が得られ、送電限
界電圧が抑制されて、運用電圧以下となって運用限界需
要が増加することがわかる。FIG. 2 is a characteristic diagram (PV curve) of the voltage reactive power control device shown in FIG. FIG. 2 shows a curve substantially equivalent to that of the series capacitor shown in FIG. 4, and it can be seen that the power transmission limit voltage is suppressed and becomes lower than or equal to the operation voltage, and the operation limit demand increases.
【００２２】本実施の形態によれば、負荷電流の大きさ
に応じた並列コンデンサの印加電圧制御により、線路保
護リレーの誤動作対策，発電機軸振動との共振対策が不
要で、限界需要の増加，電圧安定性の向上が可能であ
る。According to the present embodiment, by controlling the applied voltage of the parallel capacitor according to the magnitude of the load current, it is not necessary to take measures against malfunctions of the line protection relay and measures against resonance with vibration of the generator shaft, thereby increasing the marginal demand. Voltage stability can be improved.
【００２３】次に他の実施の形態を説明する。本例は目
標電圧Ｖｃｄの選択の仕方である。本実施の形態によれ
ば検出した負荷電流Ｉｒと、検出した電圧Ｖｒと、仮想
の直列コンデンサのリアクタンスＸｃ（設定，変更可能
な値）と並列コンデンサのサセプタンスＹｃｄとしたと
き、目標電圧Ｖｃｄを(1) 式とした。その他は第１の実
施の形態と同じである。Next, another embodiment will be described. This example is a method of selecting the target voltage Vcd. According to the present embodiment, when the detected load current Ir, the detected voltage Vr, the virtual series capacitor reactance Xc (a value that can be set and changed), and the parallel capacitor susceptance Ycd, the target voltage Vcd is set to ( 1) Formula Others are the same as the first embodiment.
【数５】 (Equation 5)
【００２４】図３の直列コンデンサ系統で直列コンデン
サ４のリアクタンスを−Ｘｃ，電力系統１の送電端電圧
をＶｓ，送電線３のリアクタンスをＸｓ，受電端電圧を
Ｖｒとし、負荷６の有効電力Ｐ，無効電力Ｑに関する式
を求めると、(2) 式が成立する。In the series capacitor system shown in FIG. 3, the reactance of the series capacitor 4 is -Xc, the voltage at the transmitting end of the power system 1 is Vs, the reactance of the transmission line 3 is Xs, and the voltage at the receiving end is Vr. , Equation (2) holds when the equation relating to the reactive power Q is obtained.
【００２５】又、図１に示す直列コンデンサ等価制御の
並列コンデンサ系統において、簡単のために並列コンデ
ンサ10の印加電圧を制御する変圧器９は理想変圧器と
し、制御対象外並列コンデンサ７のＹｃは無視し、制御
対象並列コンデンサ10のサセプタンスをＹｃｄとすると
(3) 式が成立する。In the parallel capacitor system of the series capacitor equivalent control shown in FIG. 1, for simplicity, the transformer 9 for controlling the voltage applied to the parallel capacitor 10 is an ideal transformer, and Yc of the non-controlled parallel capacitor 7 is Ignoring this and letting the susceptance of the controlled parallel capacitor 10 be Ycd
Equation (3) holds.
【００２６】[0026]
【数６】 (Equation 6)
【００２７】ここで(4) 式のとき(5) 式が成立するよう
に、即ち、負荷電流Ｉｒの大きさに比例するように印加
電圧Ｖｃを制御すれば図１の直列コンデンサ等価制御の
並列コンデンサ系統は、図３の直列コンデンサ系統と需
要−受電端電圧特性がほゞ等価となる。If the applied voltage Vc is controlled so that the expression (5) is satisfied in the case of the expression (4), that is, in proportion to the magnitude of the load current Ir, the parallel operation of the series capacitor equivalent control of FIG. The capacitor system has almost the same demand-reception-end voltage characteristics as the series capacitor system of FIG.
【数７】 (Equation 7)
【００２８】本実施の形態によれば、図４に示すような
直列コンデンサとほゞ等価な需要−受電端電圧特性が得
られ、送電限界電圧が抑制されて、運用電圧以下となる
運用限界需要が増加する。According to the present embodiment, a demand-reception-end voltage characteristic almost equivalent to that of the series capacitor as shown in FIG. 4 is obtained, and the power transmission limit voltage is suppressed, and the operation limit demand becomes lower than the operation voltage. Increase.
【００２９】更に他の実施の形態を説明する。本例は目
標電圧の選択の仕方である。本実施の形態によれば検出
した負荷電流Ｉｒと負荷無効電力Ｑｒと操作対象の並列
コンデンサ以外に投入されている並列コンデンサの容量
Ｙｃと、設定した直列コンデンサのリアクタンスＸｃと
並列コンデンサのサセプタンスＹｃｄとから、目標電圧
Ｖｃｄを(6) 式とした。その他は第１の実施の形態と同
じである。調相設備Ｙｃを考慮した直列コンデンサモデ
ルにおいては(7) 式となり、並列コンデンサモデルにお
いては(8) 式となる。Another embodiment will be described. This example is a method of selecting a target voltage. According to the present embodiment, the detected load current Ir, the load reactive power Qr, the capacitance Yc of the parallel capacitor inserted in addition to the parallel capacitor to be operated, the set reactance Xc of the series capacitor, and the susceptance Ycd of the parallel capacitor are set. Therefore, the target voltage Vcd was set to the equation (6). Others are the same as the first embodiment. Equation (7) is used for the series capacitor model considering the phase adjustment equipment Yc, and equation (8) is used for the parallel capacitor model.
【００３０】[0030]
【数８】 (Equation 8)
【００３１】ここで常に(9) 式が成立すれば(7) 式と
(8) 式は等価となる。ここでＶｐは仮想の電圧なので、
(10)，(11)，(12)の関係から消去すると(13)式となる。Here, if equation (9) always holds, then equation (7) and
Equation (8) is equivalent. Here, Vp is a virtual voltage,
Eliminating from the relations of (10), (11) and (12) yields equation (13).
【数９】 (Equation 9)
【００３２】そして(13)式が成立すれば(7) 式と(8) 式
は等価となる。そこで、Ｉｒ，Ｑｒ，Ｙｃを検出して印
加電圧Ｖｃが(13)式で得られる電圧になるようにタップ
を制御すれば、等価なものとなる。本実施の形態によれ
ば、送電限界電圧の上昇を抑制し、送電線のリアクタン
スを等価的に低減し、運用限界需要を増大させることが
できる。If the equation (13) is satisfied, the equations (7) and (8) are equivalent. Therefore, if Ir, Qr, and Yc are detected and the taps are controlled so that the applied voltage Vc becomes the voltage obtained by the equation (13), the equivalent value is obtained. According to the present embodiment, it is possible to suppress an increase in the power transmission limit voltage, reduce the reactance of the transmission line equivalently, and increase the operation limit demand.
【００３３】上記実施の形態によれば、タップ付き変圧
器の２次側に制御対象並列コンデンサ（サセプタンスＹ
ｃｄ）を接続する旨の説明をしたが、タップ付き変圧器
が負荷時タップ切替装置と変圧器とから構成されていて
も、上記実施例と同様な効果が得られる。According to the above embodiment, the control target parallel capacitor (susceptance Y) is connected to the secondary side of the tapped transformer.
Although the description of connecting cd) has been described, the same effect as in the above-described embodiment can be obtained even if the transformer with tap is constituted by the on-load tap switching device and the transformer.
【００３４】更に他の実施の形態を説明する。本実施の
形態は検出した負荷電流Ｉｒと、検出した電圧Ｖｒと、
仮想の直列コンデンサのリアクタンスＸｃと並列コンデ
ンサのサセプタンスＹｃｄとしたとき、(14)式で算出さ
れるＮをタップ比の目標値とする手段とした。本実施の
形態によれば、コンデンサの印加電圧を維持するように
タップ比を操作する間接的な制御の代わりに直接タップ
比を操作することができる。Another embodiment will be described. In the present embodiment, the detected load current Ir, the detected voltage Vr,
Assuming that the reactance Xc of the virtual series capacitor and the susceptance Ycd of the parallel capacitor, N is calculated as the target value of the tap ratio by the equation (14). According to the present embodiment, the tap ratio can be directly operated instead of indirect control of operating the tap ratio so as to maintain the voltage applied to the capacitor.
【数10】 [Equation 10]
【００３５】更に他の実施の形態を説明する。本実施の
形態では検出した負荷電流Ｉｒと負荷無効電力Ｑｒと操
作対象の並列コンデンサ以外に投入されている並列コン
デンサの容量Ｙｃと、設定した直列コンデンサのリアク
タンスＸｃと並列コンデンサのサセプタンスＹｃｄとし
たとき、(15)式で算出されるＮをタップ比の目標値とす
るようにした。本実施の形態によれば、上記実施の形態
と同様な効果が得られる。Another embodiment will be described. In the present embodiment, when the detected load current Ir, the load reactive power Qr, the capacitance Yc of the parallel capacitor other than the parallel capacitor to be operated, the reactance Xc of the set series capacitor, and the susceptance Ycd of the parallel capacitor are set. , (15) is set as the target value of the tap ratio. According to the present embodiment, effects similar to those of the above embodiment can be obtained.
【数11】 [Equation 11]
【００３６】更に他の実施の形態によれば、タップ付き
変圧器の２次側に接続されるものが、並列コンデンサに
代えて並列リアクトルであってもよく、この場合と上記
実施の形態と同様な効果が得られる。According to still another embodiment, what is connected to the secondary side of the tapped transformer may be a parallel reactor instead of a parallel capacitor. Effects can be obtained.
【００３７】更に他の実施の形態ではタップ付き変圧器
の２次側に接続されるのが、開閉装置で開閉される複数
の並列コンデンサであってもよい。本実施の形態によれ
ば、制御対象並列コンデンサの容量を変化させることが
できるので、タップ比の変化幅を小さくできる。In still another embodiment, a plurality of parallel capacitors opened and closed by a switchgear may be connected to the secondary side of the transformer with taps. According to the present embodiment, since the capacitance of the control target parallel capacitor can be changed, the width of change in the tap ratio can be reduced.
【００３８】更に他の実施の形態ではタップ付き変圧器
の２次側に接続されるのが、開閉装置で開閉される複数
の並列リアクトルであってもよい。本実施の形態によれ
ば、上記実施の形態と同様な効果が得られる。In still another embodiment, a plurality of parallel reactors that are opened and closed by a switchgear may be connected to the secondary side of the transformer with taps. According to the present embodiment, effects similar to those of the above embodiment can be obtained.
【００３９】更に他の実施の形態ではタップ付き変圧器
の２次側に接続されるのが、開閉装置で開閉される複数
の並列コンデンサ及び並列リアクトルであってもよい。
本実施の形態によれば、上記実施の形態と同様な効果が
得られる。In still another embodiment, a plurality of parallel capacitors and a parallel reactor that are opened and closed by a switchgear may be connected to the secondary side of the transformer with taps.
According to the present embodiment, effects similar to those of the above embodiment can be obtained.
【００４０】更に他の実施の形態ではタップ付き変圧器
の３次側に並列コンデンサあるいは並列リアクトルが接
続されるものであってもよい。本実施の形態によれば、
上記実施の形態と同様な効果が得られる。In still another embodiment, a parallel capacitor or a parallel reactor may be connected to the tertiary side of the tapped transformer. According to the present embodiment,
The same effects as in the above embodiment can be obtained.
【００４１】更に他の実施の形態では検出する負荷電流
が変圧器の電流の合計であるようにした。又、検出する
負荷電流が送電線の電流の合計であってもよく、更に検
出する負荷電流が変圧器と送電線の電流の合計であって
もよいし、更に負荷電流が通過するのが仮想のリアクト
ルであってもよい。本実施の形態によれば、いずれも上
記実施の形態と同様な効果が得られる。In still another embodiment, the load current to be detected is the sum of the transformer currents. Also, the load current to be detected may be the sum of the transmission line currents, and the load current to be detected may be the sum of the transformer and transmission line currents. Reactor may be used. According to the present embodiment, the same effects as those of the above embodiment can be obtained.
【００４２】[0042]
【発明の効果】以上説明したように、本発明によれば直
列コンデンサあるいはリアクトルと等価な特性が得られ
るように並列コンデンサあるいはリアクトルの印加電圧
を制御するように構成したので、直列コンデンサで問題
となる線路保護リレーの誤動作対策，発電機軸振動との
共振対策が不要で、送電線のリアクタンスを等価的に低
減し、送電限界電圧の上昇を抑制しながら、運用限界需
要を増大することができる。As described above, according to the present invention, the voltage applied to the parallel capacitor or the reactor is controlled so as to obtain characteristics equivalent to the series capacitor or the reactor. Therefore, it is not necessary to take measures against malfunctions of the line protection relay and measures against resonance with the vibration of the generator shaft, so that the reactance of the transmission line can be reduced equivalently and the operation limit demand can be increased while suppressing the rise of the transmission limit voltage.
【図１】本発明の第１の実施の形態の電圧無効電力制御
装置のシステム構成図。FIG. 1 is a system configuration diagram of a voltage reactive power control device according to a first embodiment of the present invention.
【図２】本発明の第１の実施の形態の電圧無効電力制御
装置の特性図。FIG. 2 is a characteristic diagram of the voltage reactive power control device according to the first embodiment of the present invention.
【図３】従来技術の直列コンデンサ系統図。FIG. 3 is a diagram of a conventional series capacitor system.
【図４】従来技術の直列コンデンサ系統の特性図。FIG. 4 is a characteristic diagram of a conventional series capacitor system.
【図５】従来技術の並列コンデンサ系統図。FIG. 5 is a diagram of a conventional parallel capacitor system.
【図６】従来技術の並列コンデンサ系統の特性図。FIG. 6 is a characteristic diagram of a conventional parallel capacitor system.
【符号の説明】１ 電力系統 ２ 電源 ３ 送電線 ４ 直列コンデンサ ５ 変圧器 ６ 負荷 ７ 制御対象外並列コンデンサ ８ 検出手段 ９ タップ付き変圧器 10 制御対象並列コンデンサ 11 制御部[Description of Signs] 1 Power system 2 Power supply 3 Transmission line 4 Series capacitor 5 Transformer 6 Load 7 Non-controlled parallel capacitor 8 Detecting means 9 Transformer with tap 10 Controlled parallel capacitor 11 Control unit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 多田 昌幸 東京都千代田区内幸町一丁目１番３号 東 京電力株式会社内 (72)発明者 上村 洋市 東京都府中市東芝町１番地 株式会社東芝 府中工場内 (72)発明者 津久井 良一 東京都港区芝浦一丁目１番１号 株式会社 東芝本社事務所内 (72)発明者 工藤 一彦 東京都港区芝浦一丁目１番１号 株式会社 東芝本社事務所内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masayuki Tada 1-3-1 Uchisaiwai-cho, Chiyoda-ku, Tokyo Tokyo Electric Power Company (72) Inventor Hiroshi Uemura 1-Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation Inside the Fuchu Plant (72) Inventor Ryoichi Tsukui 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Corporation Head Office (72) Inventor Kazuhiko Kudo 1-1-1, Shibaura, Minato-ku, Tokyo Office of Toshiba Corporation Inside
Claims (10)
き変圧器と、そのタップ付き変圧器の２次側に接続され
る並列コンデンサと、電力系統からの負荷電流を入力と
する制御部とを備え、前記制御部には仮想の直列コンデ
ンサを前記負荷電流が通過したときに発生する無効電力
と等価な無効電力を発生するように、前記並列コンデン
サの端子電圧目標値を定める手段と、前記並列コンデン
サの端子電圧を前記目標値に維持するようにタップを調
整する手段とを備えたことを特徴とする電圧無効電力制
御装置。1. A tapped transformer having a primary side connected to a power system, a parallel capacitor connected to a secondary side of the tapped transformer, and a control unit having a load current from the power system as an input. Means for determining a terminal voltage target value of the parallel capacitor, so that the control unit generates a reactive power equivalent to a reactive power generated when the load current passes through a virtual series capacitor. Means for adjusting taps so as to maintain the terminal voltage of the parallel capacitor at the target value.
て、電圧目標値を定める手段が、検出した負荷電流Ｉｒ
と、仮想の直列コンデンサのリアクタンスＸｃと並列コ
ンデンサのサセプタンスをＹｃｄとしたとき下式 【数１】 で算出される電圧Ｖを目標電圧とする手段であることを
特徴とする電圧無効電力制御装置。2. The voltage reactive power control device according to claim 1, wherein the means for determining the voltage target value includes a load current Ir
When the reactance Xc of the virtual series capacitor and the susceptance of the parallel capacitor are Ycd, the following equation is obtained. A voltage reactive power control device, characterized in that the voltage V is a means for setting the voltage V calculated in step (1) to a target voltage.
て、電圧目標値を定める手段が、検出した負荷電流Ｉｒ
と負荷無効電力Ｑｒと制御対象以外で投入されている並
列コンデンサの容量Ｙｃと、設定した直列コンデンサの
リアクタンスＸｃと制御対象並列コンデンサのサセプタ
ンスをＹｃｄとしたとき下式 【数２】 で算出される電圧Ｖを目標電圧とする手段であることを
特徴とする電圧無効電力制御装置。3. The voltage reactive power control device according to claim 1, wherein the means for determining the voltage target value includes a load current Ir
, The reactive reactive power Qr, the capacity Yc of the parallel capacitor supplied except for the control target, the reactance Xc of the set series capacitor, and the susceptance of the control target parallel capacitor as Ycd. A voltage reactive power control device, characterized in that the voltage V is a means for setting the voltage V calculated in step (1) to a target voltage.
て、電圧目標値を定める手段が、検出した負荷電流Ｉｒ
と、検出した電圧Ｖｒと、仮想の直列コンデンサのリア
クタンスＸｃと並列コンデンサのサセプタンスをＹｃｄ
としたとき下式 【数３】 で算出されるＮをタップ比の目標値とする手段であるこ
とを特徴とする電圧無効電力制御装置。4. The voltage reactive power control device according to claim 1, wherein the means for determining the voltage target value includes a detected load current Ir.
, The detected voltage Vr, the reactance Xc of the virtual series capacitor, and the susceptance of the parallel capacitor as Ycd.
And the following equation A voltage-reactive-power control device, wherein N is a means for setting a target value of a tap ratio.
て、電圧目標値を定める手段が、検出した負荷電流Ｉｒ
と負荷無効電力Ｑｒと操作対象の並列コンデンサ以外に
投入されている並列コンデンサの容量Ｙｃと、設定した
直列コンデンサのリアクタンスＸｃと並列コンデンサの
サセプタンスをＹｃｄとしたとき下式 【数４】 で算出されるＮをタップ比の目標値とする手段であるこ
とを特徴とする電圧無効電力制御装置。5. The voltage reactive power control device according to claim 1, wherein the means for determining the voltage target value includes a load current Ir
And the reactive reactive power Qr, the capacity Yc of the parallel capacitor other than the parallel capacitor to be operated, the reactance Xc of the set series capacitor, and the susceptance of the parallel capacitor Ycd, the following equation: A voltage-reactive-power control device, wherein N is a means for setting a target value of a tap ratio.
て、タップ付き変圧器の２次側に接続されるのが、並列
リアクトルであることを特徴とする電圧無効電力制御装
置。6. The voltage reactive power control device according to claim 1, wherein the reactor connected to the secondary side of the tapped transformer is a parallel reactor.
御装置において、タップ付き変圧器の２次側に接続され
るのが、開閉装置で開閉される複数の並列コンデンサ又
は並列リアクトルであることを特徴とする電圧無効電力
制御装置。7. The voltage reactive power control device according to claim 1, wherein a plurality of parallel capacitors or parallel reactors that are opened and closed by a switchgear are connected to a secondary side of the tapped transformer. A voltage reactive power control device characterized by the above-mentioned.
て、タップ付き変圧器の２次側に接続されるのが、開閉
装置で開閉される複数の並列コンデンサ及び並列リアク
トルであることを特徴とする電圧無効電力制御装置。8. The voltage reactive power control device according to claim 1, wherein a plurality of parallel capacitors and a parallel reactor that are connected and opened by a switchgear are connected to a secondary side of the tapped transformer. Voltage reactive power control device.
御装置において、タップ付き変圧器の３次側に並列コン
デンサあるいは並列リアクトルが接続されることを特徴
とする電圧無効電力制御装置。9. The voltage reactive power control device according to claim 1, wherein a parallel capacitor or a parallel reactor is connected to a tertiary side of the tapped transformer.
いて、負荷電流が通過するのが仮想のリアクトルである
ことを特徴とする電圧無効電力制御装置。10. The voltage reactive power control device according to claim 1, wherein the load current passes through a virtual reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27732796A JP3601917B2 (en) | 1996-09-27 | 1996-09-27 | Voltage reactive power controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27732796A JP3601917B2 (en) | 1996-09-27 | 1996-09-27 | Voltage reactive power controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10108367A true JPH10108367A (en) | 1998-04-24 |
| JP3601917B2 JP3601917B2 (en) | 2004-12-15 |
Family
ID=17581990
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27732796A Expired - Fee Related JP3601917B2 (en) | 1996-09-27 | 1996-09-27 | Voltage reactive power controller |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716657A (en) * | 2015-03-26 | 2015-06-17 | 江苏现代电力科技股份有限公司 | Intelligent integrated power capacitance compensation device and load distribution method thereof |
| CN114899865A (en) * | 2022-04-27 | 2022-08-12 | 安徽工业大学 | Reactive compensation method for large-scale new energy grid-connected system |
-
1996
- 1996-09-27 JP JP27732796A patent/JP3601917B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716657A (en) * | 2015-03-26 | 2015-06-17 | 江苏现代电力科技股份有限公司 | Intelligent integrated power capacitance compensation device and load distribution method thereof |
| CN114899865A (en) * | 2022-04-27 | 2022-08-12 | 安徽工业大学 | Reactive compensation method for large-scale new energy grid-connected system |
| CN114899865B (en) * | 2022-04-27 | 2024-04-19 | 安徽工业大学 | Reactive compensation method for large-scale new energy grid-connected system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3601917B2 (en) | 2004-12-15 |
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