JPH04372007A - Reactive power controller - Google Patents
Reactive power controllerInfo
- Publication number
- JPH04372007A JPH04372007A JP3176042A JP17604291A JPH04372007A JP H04372007 A JPH04372007 A JP H04372007A JP 3176042 A JP3176042 A JP 3176042A JP 17604291 A JP17604291 A JP 17604291A JP H04372007 A JPH04372007 A JP H04372007A
- Authority
- JP
- Japan
- Prior art keywords
- reactive power
- receiving point
- load
- power receiving
- voltage
- 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.)
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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
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- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、受電点の電圧変動を補
償する無効電力制御装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reactive power control device that compensates for voltage fluctuations at a power receiving point.
【０００２】0002
【従来の技術】図４と図５は例えば「三菱電機技報」（
Ｖｏｌ．６２、Ｎｏ．６（１９８８）、Ｐ１５〜Ｐ２０
）に示された従来の無効電力制御装置を示す構成図であ
る。図において、１は実効値電圧Ｖ∞の無限大母線、２
は配電線、変圧器またはリアクトルのリアクタンスｘ０
、３は実効値電圧Ｖ０ の上位受電点、４は配電線、
変圧器またはリアクトルのリアクタンスｘＡ 、５は実
効値電圧ＶＡ の下位受電点、６は上位受電点３に接続
された下位受電点５の負荷Ａ、７は負荷Ａ６を除く上位
受電点３に接続された負荷Ｂ、８は無効電力補償装置で
、基本波実効値電圧ＶＣ の電圧源８０１と、変圧器ま
たはリアクトルのリアクタンスｘＣ ８０２及び無効電
力出力指令値ＱＣ＊から電圧指令値ＶＣ＊を演算する電
圧制御回路８０３を有する。また、９は負荷Ａ６の負荷
電流ＩＡ を検出する電流変成器、１０は負荷電流ＩＡ
から負荷Ａの発生する無効電力ＱＡ を演算する無効電
力検出回路である。[Prior art] Figures 4 and 5 are, for example, from "Mitsubishi Electric Technical Report" (
Vol. 62, No. 6 (1988), P15-P20
) is a configuration diagram showing a conventional reactive power control device shown in FIG. In the figure, 1 is an infinite bus of effective value voltage V∞, 2
is the reactance of the distribution line, transformer or reactor x0
, 3 is the upper receiving point of the effective value voltage V0, 4 is the distribution line,
Reactance xA of the transformer or reactor, 5 is the lower power receiving point of the effective value voltage VA, 6 is the load A of the lower power receiving point 5 connected to the upper power receiving point 3, and 7 is the load A of the lower power receiving point 5 connected to the upper power receiving point 3 excluding load A6. The load B, 8 is a reactive power compensator, which calculates the voltage command value VC* from the voltage source 801 of the fundamental wave effective value voltage VC, the reactance xC of the transformer or reactor 802, and the reactive power output command value QC*. It has a control circuit 803. Further, 9 is a current transformer that detects the load current IA of load A6, and 10 is a current transformer that detects the load current IA of load A6.
This is a reactive power detection circuit that calculates reactive power QA generated by load A from .
【０００３】次に動作について説明する。負荷Ａ６の負
荷電流ＩＡ を電流変成器９によって検出し、無効電力
検出回路１０によって負荷Ａ６の発生無効電力ＱＡ を
演算し、ＱＡ を無効電力出力指令値ＱＣ＊として無効
電力補償装置８に与える。無効電力補償装置８は内蔵す
る電圧制御回路８０３によって無効電力出力指令値ＱＣ
＊から電圧源８０１の電圧指令値ＶＣ＊を演算し、電圧
源８０１は電圧指令値ＶＣ＊に従って基本波電圧ＶＣ
を含む電圧を発生し、変圧器またはリアクトル８０２の
合成リアクタンスｘＣ の両端に下位受電点の実効値電
圧ＶＡ と電圧源８０１の基本波実効値電圧ＶＣ との
差電圧ＶＣ −ＶＡ を発生させることにより無効電力
補償装置８の補償電流ＩＣ を次式で示すように制御す
る。
ＩＣ ＝（ＶＣ −ＶＡ ）／ｘＣ
……（１）ここで、ＩＣ は補償電流の基本波実効値
とする。Next, the operation will be explained. Load current IA of load A6 is detected by current transformer 9, reactive power detection circuit 10 calculates reactive power QA generated by load A6, and QA is provided to reactive power compensator 8 as reactive power output command value QC*. The reactive power compensator 8 adjusts the reactive power output command value QC by the built-in voltage control circuit 803.
The voltage command value VC* of the voltage source 801 is calculated from *, and the voltage source 801 generates the fundamental wave voltage VC according to the voltage command value VC*.
By generating a voltage including the transformer or reactor 802's combined reactance xC, a difference voltage VC - VA between the effective value voltage VA of the lower power receiving point and the fundamental wave effective value voltage VC of the voltage source 801 is generated. The compensation current IC of the reactive power compensator 8 is controlled as shown in the following equation. IC=(VC-VA)/xC
...(1) Here, IC is the effective value of the fundamental wave of the compensation current.
【０００４】次いで、ＶＣ ＝ＶＡ となるように電圧
指令値ＶＣ＊を与えれば、補償電流ＩＣ は零電流とな
り（図６（ａ）参照）、ＶＣ ＞ＶＡ となるように電
圧指令値ＶＣ＊を与えれば、補償電流ＩＣ は進相電流
となって、無効電力補償装置８は進相無効電力ＱＣ （
＝ＱＣ＊）を出力し（図６（ｂ）参照）、また、ＶＣ
＜ＶＡ となるように電圧指令値ＶＣ＊を与えれば、補
償電流ＩＣ は遅相電流となって、無効電力補償装置８
は遅相無効電力ＱＣ （＝ＱＣ＊）を出力する（図６（
ｃ）参照）。Next, if the voltage command value VC* is given so that VC = VA, the compensation current IC becomes zero current (see FIG. 6(a)), and the voltage command value VC* is given so that VC > VA. If given, the compensation current IC becomes a phase-leading current, and the reactive power compensator 8 generates a phase-leading reactive power QC (
=QC*) (see Figure 6(b)), and also outputs VC
If the voltage command value VC* is given so that <VA, the compensation current IC becomes a slow phase current, and the reactive power compensator 8
outputs the lagging reactive power QC (=QC*) (Fig. 6 (
c).
【０００５】無効電力補償装置８は負荷Ａ６の発生する
無効電力ＱＡ に従って無効電力ＱＣ（＝ＱＣ＊）を逆
位相で出力するので、下位受電点５の配電線、変圧器ま
たはリアクトル４のリアクタンスｘＡ による電圧変動
△ＶＡ （＝Ｖ０ −ＶＡ ）は、次式
△ＶＡ ＝ｘＡ ・（ＱＡ −ＱＣ ）
＝ｘＡ ・（ＱＡ −ＱＣ＊）
＝ｘＡ ・（ＱＡ −ＱＡ
） ＝０
……（２）に示すように零電圧に制
御することができ、負荷Ａ６の無効電力が変動しても下
位受電点５の電圧変動を補償することができる。Since the reactive power compensator 8 outputs the reactive power QC (=QC*) in opposite phase according to the reactive power QA generated by the load A6, the reactance xA of the distribution line, transformer or reactor 4 of the lower power receiving point 5 The voltage fluctuation △VA (=V0 - VA) due to the following formula: △VA = xA ・(QA - QC)
=xA ・(QA −QC*)
=xA ・(QA −QA
) =0
... As shown in (2), the voltage can be controlled to zero, and even if the reactive power of the load A6 fluctuates, the voltage fluctuation of the lower power receiving point 5 can be compensated for.
【０００６】[0006]
【発明が解決しようとする課題】従来の無効電力制御装
置は以上のように構成されているので、負荷Ｂ７の無効
電力ＱＢ の変動によって上位受電点３の電圧Ｖ０ と
下位受電点５の電圧ＶＡ が変動することになり、下位
受電点５の電圧を十分に補償できなくなる問題点があっ
た。[Problems to be Solved by the Invention] Since the conventional reactive power control device is configured as described above, the voltage V0 at the upper power receiving point 3 and the voltage VA at the lower power receiving point 5 are changed due to fluctuations in the reactive power QB of the load B7. This causes a problem in that the voltage at the lower power receiving point 5 cannot be sufficiently compensated for.
【０００７】本発明は、上記のような問題点を解消する
ためになされたもので、負荷Ａの無効電力ＱＡ の変動
だけでなく、負荷Ｂの無効電力ＱＢ の変動によって生
ずる下位受電点の電圧変動を補償できる無効電力制御装
置を得ることを目的としている。The present invention has been made to solve the above-mentioned problems, and it is possible to reduce the voltage at the lower receiving point caused not only by the fluctuation of the reactive power QA of the load A but also by the fluctuation of the reactive power QB of the load B. The objective is to obtain a reactive power control device that can compensate for fluctuations.
【０００８】[0008]
【課題を解決するための手段】本発明に係る無効電力制
御装置は、上位受電点と下位受電点の間にリアクタンス
ｘＡ を設置して、負荷Ｂの発生する無効電力ＱＢ だ
けでなく負荷Ａの発生する無効電力ＱＡ をも検出する
ことによって、下位受電点の電圧変動を補償するもので
ある。[Means for Solving the Problems] The reactive power control device according to the present invention installs a reactance xA between an upper power receiving point and a lower power receiving point, and controls not only the reactive power QB generated by load B but also the reactive power QB generated by load A. By also detecting the generated reactive power QA, voltage fluctuations at lower power receiving points are compensated for.
【０００９】[0009]
【作用】本発明における無効電力制御装置は、負荷Ｂの
発生する無効電力ＱＢ よりも少ない容量を出力するこ
とにより負荷Ｂの発生する無効電力ＱＢ が原因となる
下位受電点５の電圧変動を補償する。[Operation] The reactive power control device according to the present invention compensates for voltage fluctuations at the lower power receiving point 5 caused by the reactive power QB generated by the load B by outputting a capacity smaller than the reactive power QB generated by the load B. do.
【００１０】0010
実施例１．以下、本発明の一実施例を図について説明す
る。図１は本実施例に係る無効電力制御装置の構成図を
示し、図において、１から１０までの構成要素は図４に
示す従来例と同一のものである。また、１１は負荷Ｂ７
の負荷電流ＩＢ を検出する電流変成器、１２は負荷電
流ＩＢ から負荷Ｂの発生する無効電力ＱＢ を演算す
る無効電力検出回路、１３は乗算器、１４は加算器であ
る。Example 1. Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration diagram of a reactive power control device according to this embodiment, and in the diagram, components 1 to 10 are the same as those in the conventional example shown in FIG. 4. In addition, 11 is load B7
12 is a reactive power detection circuit that calculates reactive power QB generated by load B from load current IB, 13 is a multiplier, and 14 is an adder.
【００１１】次に動作について説明する。図１において
、図４に示す従来例の場合の動作に加えて、さらに、上
位受電点３に接続された負荷Ｂの負荷電流ＩＢ を電流
変成器１１によって検出し、負荷Ｂの発生する無効電力
ＱＢ を無効電力検出回路１２によって演算し、乗算器
１３によってインピーダンス比ｘ０ ／（ｘ０ ＋ｘＡ
）を乗じて無効電力（ＱＢ ）Ａ を演算し、加算器
１４によってそれと負荷Ａの発生する無効電力ＱＡ と
を加算したものを無効電力補償装置８の無効電力指令値
ＱＣ＊とすることによって、下位受電点５の電圧変動を
補償する。Next, the operation will be explained. In FIG. 1, in addition to the operation in the conventional example shown in FIG. QB is calculated by the reactive power detection circuit 12, and the impedance ratio x0 / (x0 + xA
) to calculate the reactive power (QB)A, and add it to the reactive power QA generated by the load A using the adder 14 and set it as the reactive power command value QC* of the reactive power compensator 8. Compensate for voltage fluctuations at the lower power receiving point 5.
【００１２】インピーダンス比ｘ０ ／（ｘ０ ＋ｘＡ
）は配電線、変圧器またはリアクトル２の合成リアクタ
ンスｘ０ と、配電線、変圧器またはリアクトル４の合
成リアクタンスｘＡ による無限大母線１から見た下位
受電点５に対する上位受電点３のインピーダンス比であ
り、次に示される考えから導びかれる。[0012] Impedance ratio x0 / (x0 + xA
) is the impedance ratio of the upper receiving point 3 to the lower receiving point 5 as seen from the infinite bus 1 due to the combined reactance x0 of the distribution line, transformer or reactor 2 and the combined reactance xA of the distribution line, transformer or reactor 4. , follows from the following ideas.
【００１３】実効値電圧Ｖ∞の無限大母線１に対する実
効値電圧Ｖ０ の上位受電点３の電圧変動△Ｖ０ は、
△Ｖ０ ＝ｘ０ ・（ＱＡ ＋ＱＢ −Ｑ
Ｃ ） ……
（３）で与えられ、上位受電点３に対する実効値電圧Ｖ
Ａ の下位受電点５の電圧降下△ＶＡ は、
△ＶＡ ＝ｘＡ ・（ＱＡ −ＱＣ ）
……（４）で与えられる。下位受電点５の電圧を補償す
るためには無限大母線１に対する下位受電点５の電圧降
下△Ｖ０ ＋△ＶＡ を零にすればよいから、これを解
けば ＱＣ ＝ＱＡ ＋〔ｘ０ ／（ｘ０
＋ｘＡ ）〕・ＱＢ ……（
５）となり、インピーダンス比ｘ０ ／（ｘ０ ＋ｘＡ
）が導かれる。The voltage fluctuation △V0 of the effective value voltage V0 at the upper receiving point 3 with respect to the infinite bus 1 of the effective value voltage V∞ is as follows:
△V0 =x0 ・(QA +QB -Q
C)...
(3), the effective value voltage V for the upper power receiving point 3
The voltage drop △VA at the lower power receiving point 5 of A is △VA = xA ・(QA - QC)
... is given by (4). In order to compensate for the voltage at the lower power receiving point 5, the voltage drop △V0 + △VA at the lower power receiving point 5 with respect to the infinite bus 1 should be made zero, so by solving this, QC = QA + [x0 / (x0
+xA)〕・QB……(
5), and the impedance ratio x0 / (x0 + xA
) is guided.
【００１４】したがって、無効電力補償装置８は無効電
力ＱＡ ＋〔ｘ０ ／（ｘ０ ＋ｘＡ ）〕・ＱＢ を
出力することによって下位受電点５の電圧変動を補償す
ることができる。Therefore, the reactive power compensator 8 can compensate for voltage fluctuations at the lower power receiving point 5 by outputting the reactive power QA + [x0 / (x0 + xA)]·QB.
【００１５】実施例２．図１に示す実施例１においては
、負荷Ｂの発生する無効電力ＱＢ を負荷Ｂの負荷電流
ＩＢ から演算したが、図２に示すように、上位受電点
３の実効値電圧Ｖ０を電圧変成器１８によって検出し、
上位受電点３の電圧降下△Ｖ０ を電圧変動検出回路１
９によって検出し、式（３）に示されるように乗算器２
０によってゲイン１／ｘ０ を乗じて無効電力（ＱＡ
＋ＱＢ −ＱＣ ）を得、さらに、無効電力補償装置８
の補償電流ＩＣ を電流変成器１５によって検出し、無
効電力検出回路１６によって無効電力ＱＣ を演算し、
加算器１７によって無効電力（ＱＡ −ＱＣ ）を求め
て、加算器２１によって負荷Ｂの発生する無効電力ＱＢ
を得るようにしても良い。Example 2. In Example 1 shown in FIG. 1, the reactive power QB generated by load B was calculated from the load current IB of load B, but as shown in FIG. Detected by 18,
The voltage drop △V0 at the upper power receiving point 3 is detected by the voltage fluctuation detection circuit 1.
9 and multiplier 2 as shown in equation (3).
Multiplying the gain 1/x0 by 0 gives the reactive power (QA
+QB -QC ), and furthermore, the reactive power compensator 8
A compensation current IC is detected by a current transformer 15, a reactive power QC is calculated by a reactive power detection circuit 16,
The adder 17 calculates the reactive power (QA - QC), and the adder 21 calculates the reactive power QB generated by the load B.
You can also try to get .
【００１６】実施例３．また、上述したように図２に示
した実施例２においては、上位受電点３の実効値電圧Ｖ
０ から負荷Ｂの無効電力ＱＢ を演算したが、図３に
示すように、下位受電点５の実効値電圧ＶＡ を電圧変
成器２２によって検出し、無限大母線１に対する下位受
電点５の電圧変動（△Ｖ０ ＋△ＶＡ ）を電圧変動検
出回路２３によって演算する一方で、式（４）に示され
るように、乗算器２４によって配電線、変圧器またはリ
アクトル４のリアクタンスｘＡ を無効電力（ＱＡ −
ＱＣ ）に乗じて電圧降下△ＶＡ を求め、加算器２５
によって電圧降下△Ｖ０ を得るようにしても良い。Example 3. Further, as described above, in the second embodiment shown in FIG. 2, the effective value voltage V of the upper power receiving point 3
0, the reactive power QB of the load B was calculated from (△V0 +△VA) is calculated by the voltage fluctuation detection circuit 23, while the reactive power (QA −
QC ) is multiplied to obtain the voltage drop △VA, and the adder 25
The voltage drop ΔV0 may be obtained by
【００１７】[0017]
【発明の効果】以上のように、本発明によれば、上位受
電点と下位受電点の間にインピーダンスｘＡ を設置し
て、負荷Ｂの発生する無効電力ＱＢ のうちの一部を補
償するように構成したので、装置の無効電力補償容量が
負荷Ａと負荷Ｂの発生する無効電力の合計よりも少ない
容量で、下位受電点の電圧変動を補償できる効果がある
。[Effects of the Invention] As described above, according to the present invention, impedance xA is installed between the upper power receiving point and the lower power receiving point to compensate for a part of the reactive power QB generated by load B. This configuration has the effect of being able to compensate for voltage fluctuations at lower power receiving points with the reactive power compensation capacity of the device being smaller than the sum of the reactive powers generated by loads A and B.
【図１】本発明の実施例１を示す構成図である。FIG. 1 is a configuration diagram showing a first embodiment of the present invention.
【図２】本発明の実施例２を示す構成図である。FIG. 2 is a configuration diagram showing a second embodiment of the present invention.
【図３】本発明の実施例３を示す構成図である。FIG. 3 is a configuration diagram showing a third embodiment of the present invention.
【図４】従来の無効電力補償装置の制御装置を示す構成
図である。FIG. 4 is a configuration diagram showing a conventional control device for a reactive power compensator.
【図５】無効電力補償装置を示す構成図である。FIG. 5 is a configuration diagram showing a reactive power compensator.
【図６】無効電力補償装置の動作説明図である。FIG. 6 is an explanatory diagram of the operation of the reactive power compensator.
１ 実効値電圧Ｖ∞の無限大母線２
配電線、変圧器またはリアクトルの合成リ
アクタンスｘ０
３ 実効値電圧Ｖ０ の上位受電点４
配電線、変圧器またはリアクトルの合成
リアクタンスｘＡ
５ 実効値電圧ＶＡ の下位受電点６
負荷Ａ
７ 負荷Ｂ
８ 無効電力補償装置
９ 電流変成器
１０ 無効電力検出回路
１１ 電流変成器
１２ 無効電力検出回路
１３ 乗算器
１４ 加算器
１５ 電流変成器
１６ 無効電力検出回路
１７ 加算器
１８ 電圧変成器
１９ 電圧変動検出回路
２０ 乗算器
２１ 加算器
２２ 電圧変成器
２３ 電圧変動検出回路
２４ 乗算器
２５ 加算器
８０１ 基本波実効値電圧ＶＣ の電圧源８０２
変圧器またはリアクトルの合成リアクタンスｘ
Ｃ
８０３ 電圧制御回路1 Infinite bus bar of effective value voltage V∞ 2
Combined reactance of distribution line, transformer or reactor x0 3 Upper receiving point of effective value voltage V0 4
Combined reactance of distribution line, transformer or reactor xA 5 Lower power receiving point of effective voltage VA 6
Load A 7 Load B 8 Reactive power compensator 9 Current transformer 10 Reactive power detection circuit 11 Current transformer 12 Reactive power detection circuit 13 Multiplier 14 Adder 15 Current transformer 16 Reactive power detection circuit 17 Adder 18 Voltage transformer 19 Voltage fluctuation detection circuit 20 Multiplier 21 Adder 22 Voltage transformer 23 Voltage fluctuation detection circuit 24 Multiplier 25 Adder 801 Voltage source 802 of fundamental wave effective value voltage VC
Combined reactance x of transformer or reactor
C 803 Voltage control circuit
Claims (1)
の電圧変動を補償する無効電力補償装置を備えた無効電
力制御装置において、上位受電点と下位受電点の間にイ
ンピーダンスをもつ機器を設置して、下位受電点の負荷
の発生無効電力をする検出手段と、上位受電点の負荷の
発生無効電力を検出する検出手段と、上位受電点の負荷
に発生する無効電力に無限大母線と下位受電点のリアク
タンスに対する無限大母線と上位受電点のリアクタンス
のインピーダンス比を乗ずる乗算器と、その乗算出力と
下位受電点の負荷の発生無効電力を加算する加算器とを
備え、その加算出力を無効電力出力指令値とすることを
特徴とする無効電力制御装置。[Claim 1] In a reactive power control device equipped with a reactive power compensator that compensates for voltage fluctuations at a power receiving point based on a reactive power output command value, a device having impedance is installed between an upper power receiving point and a lower power receiving point. and detecting means for detecting the generated reactive power of the load at the lower power receiving point; detection means for detecting the generated reactive power for the load at the higher power receiving point; Equipped with a multiplier that multiplies the reactance of the power receiving point by the impedance ratio of the infinite bus and the reactance of the higher power receiving point, and an adder that adds the multiplication output to the reactive power generated by the load of the lower power receiving point, and disables the addition output. A reactive power control device characterized in that a power output command value is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3176042A JP2672905B2 (en) | 1991-06-20 | 1991-06-20 | Reactive power controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3176042A JP2672905B2 (en) | 1991-06-20 | 1991-06-20 | Reactive power controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04372007A true JPH04372007A (en) | 1992-12-25 |
| JP2672905B2 JP2672905B2 (en) | 1997-11-05 |
Family
ID=16006705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3176042A Expired - Fee Related JP2672905B2 (en) | 1991-06-20 | 1991-06-20 | Reactive power controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2672905B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208804A (en) * | 2012-12-31 | 2013-07-17 | 武汉大学 | Branch voltage stability analysis based selection method for reactive power compensation point of microgrid |
| CN111579876A (en) * | 2019-02-18 | 2020-08-25 | 英捷力电机股份有限公司 | Capacitance value monitoring method for capacitor of power system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2843786B1 (en) * | 2013-09-03 | 2018-04-18 | KONE Corporation | An elevator line bridge filter for compensating reactive power in a grid |
-
1991
- 1991-06-20 JP JP3176042A patent/JP2672905B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208804A (en) * | 2012-12-31 | 2013-07-17 | 武汉大学 | Branch voltage stability analysis based selection method for reactive power compensation point of microgrid |
| CN111579876A (en) * | 2019-02-18 | 2020-08-25 | 英捷力电机股份有限公司 | Capacitance value monitoring method for capacitor of power system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2672905B2 (en) | 1997-11-05 |
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| LAPS | Cancellation because of no payment of annual fees |