JPH0923585A - Reactive power compensation control method - Google Patents
Reactive power compensation control methodInfo
- Publication number
- JPH0923585A JPH0923585A JP7171699A JP17169995A JPH0923585A JP H0923585 A JPH0923585 A JP H0923585A JP 7171699 A JP7171699 A JP 7171699A JP 17169995 A JP17169995 A JP 17169995A JP H0923585 A JPH0923585 A JP H0923585A
- Authority
- JP
- Japan
- Prior art keywords
- inverter
- reactive power
- voltage
- control
- power component
- 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
(57)【要約】
【目的】 負荷の無効電力が急変しても系統の電圧降下
を緩和できる無効電力補償をする。
【構成】 インバータの電圧制御回路を系統電圧Ｖ0と
等価な基準電圧量Ｖ0を基準入力とするオープン電圧制
御回路とし、負荷側の無効電力成分電流ｉxLをインバー
タの定格に制限するリミッタ１１によりインバータの供
給する無効電流量ｉxL’を作成し、回路１２でインバー
タの内部インピーダンス電圧降下分△Ｖ1を求め、ｉxL
とインバータの無効電力成分電流ｉxiから系統側のリア
クタンス電圧降下分△Ｖ2を求め、基準入力Ｖ0をｉxLが
インバータ容量内の場合は△Ｖ1により補正し、インバ
ータ容量を越えた場合は△Ｖ1と△Ｖ2で補正し、インバ
ータ出力電圧をオープン制御で迅速に制御する。更にｉ
xLとｉxiとの偏差を偏差増幅回路１４で増幅し、その信
号を基準入力Ｖ0に加えてオープンループ制御による制
御誤差をフィードバック制御によりなくし、制御精度を
保つ。
(57) [Summary] [Purpose] Compensating for reactive power that can mitigate the voltage drop in the system even if the reactive power of the load changes suddenly. [Configuration] An inverter voltage control circuit is an open voltage control circuit having a reference voltage amount V 0 equivalent to a system voltage V 0 as a reference input, and a limiter 11 for limiting the reactive power component current i xL on the load side to the inverter rating. Then, the reactive current amount i xL 'supplied by the inverter is created by using the circuit 12, the internal impedance voltage drop ΔV 1 of the inverter is obtained by the circuit 12, and i xL
And obtains a reactance voltage drop △ V 2 of the system side from the reactive power component current i xi of the inverter, a reference input V 0 if i xL is in the inverter capacity corrected by △ V 1, when it exceeds the inverter capacity Is corrected by ΔV 1 and ΔV 2 , and the inverter output voltage is quickly controlled by open control. Further i
The deviation between xL and i xi is amplified by the deviation amplifier circuit 14, the signal is added to the reference input V 0, and the control error due to the open loop control is eliminated by the feedback control to maintain the control accuracy.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、交流系統の無効電力を
検出して無効電力を補償する自励式インバータを用いた
無効電力補償の制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reactive power compensation control method using a self-excited inverter that detects reactive power in an AC system and compensates the reactive power.
【０００２】[0002]
【従来の技術】従来、無効電力補償装置の構成を図６に
示す。同図において、４は無効電力補償装置の自励式イ
ンバータで、インバータの交流側は交流リアクトルＬ1
を介して配電線２に接続され、直流側にはコンデンサＣ
1が接続されている。コンデンサＣ1はインバータのスイ
ッチング素子と逆並列に接続されている帰還ダイオード
を介して充電され、インバータはこのコンデンサを直流
電源として動作する。2. Description of the Related Art The structure of a conventional reactive power compensator is shown in FIG. In the figure, 4 is a self-excited inverter of the reactive power compensator, and the AC side of the inverter is an AC reactor L 1
Is connected to the distribution line 2 via the
1 is connected. The capacitor C 1 is charged via a feedback diode connected in antiparallel with the switching element of the inverter, and the inverter operates with this capacitor as a DC power source.
【０００３】８は無効電力検出回路で、電圧検出用変圧
器ＰＴ1，変流器ＣＴ1，ＣＴ3からの電圧，電流により
負荷の無効電力ＱL及びインバータの出力無効電力Ｑiを
検出する。[0003] 8 a reactive power detection circuit, a voltage detection transformer PT 1, detects a current transformer CT 1, voltage from the CT 3, the reactive power of the load by the current Q L and the output reactive power Q i of the inverter .
【０００４】３１〜３５はインバータの制御回路で、３
１は変圧器ＰＴ1で検出した電圧から系統電圧の同期信
号を得る同期回路、３２はこの同期信号とインバータの
出力が同期するように制御する周波数制御系、３３は検
出回路８からの無効電力ＱLとＱiとの偏差を検出する無
効電力制御系、３４はＱLとＱiの差がなくなるようにイ
ンバータの出力電圧を制御する電圧制御系、３５は周波
数制御系及び電圧制御系の信号を受けてインバータのス
イッチング素子のゲートを駆動するゲート制御回路であ
る。Reference numerals 31 to 35 are inverter control circuits.
1 is a synchronous circuit that obtains a synchronous signal of the system voltage from the voltage detected by the transformer PT 1 , 32 is a frequency control system that controls so that the synchronous signal and the output of the inverter are synchronized, and 33 is reactive power from the detection circuit 8. reactive power control system for detecting a deviation between Q L and Q i, 34 is a voltage control system for controlling the output voltage of the inverter so that there is no difference between Q L and Q i, 35 is a frequency control system and the voltage control system It is a gate control circuit that receives a signal and drives a gate of a switching element of an inverter.
【０００５】以上のように無効電力補償装置はインバー
タを周波数制御と電圧制御により負荷の無効電力を補償
している。As described above, the reactive power compensator compensates the reactive power of the load by frequency control and voltage control of the inverter.
【０００６】[0006]
【発明が解決しようとする課題】上記従来の無効電力補
償装置は、無効電力を補償する制御系が負荷側で発生す
る無効電力を検出してこれを設定入力とし、インバータ
出力の無効電力を検出信号とする閉ループの制御として
いる。このため制御精度は確保できるが、全体の制御系
を速くすると自動系が不安定となり、オーバシュート等
が発生してインバータ装置の出力が過大となる現象が発
生するので、制御系にＰＩ増幅器等の遅れを入れて安定
性を保つ回路方式となっている。The above-mentioned conventional reactive power compensator detects the reactive power generated on the load side by the control system for compensating the reactive power and uses this as the setting input to detect the reactive power of the inverter output. The signal is used as a closed loop control. For this reason, control accuracy can be secured, but if the overall control system is made faster, the automatic system becomes unstable and an overshoot or the like occurs, which causes the output of the inverter device to become excessive. It is a circuit system that maintains the stability by adding the delay of.
【０００７】以上のことから制御の高速化ができず負荷
の無効電力が急変すると、無効電力補償に遅れが発生し
系統の電圧が大きく変動する。From the above, when the control speed cannot be increased and the reactive power of the load changes suddenly, a delay occurs in the reactive power compensation and the voltage of the system fluctuates greatly.
【０００８】本発明は、従来のこのような問題点に鑑み
てなされたものであり、その目的とするところは、負荷
の無効電力が急変しても系統の電圧降下を緩和すること
ができる無効電力補償の制御方法を提供することにあ
る。The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a reactive voltage which can alleviate a voltage drop in a system even when a reactive power of a load changes suddenly. It is to provide a control method of power compensation.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、電圧制御と周波数制御により負荷の無効
電力を補償する自励式インバータを使用した無効電力補
償の制御において、電圧制御を、系統の無負荷時の誘起
電圧と等価な基準電圧量を基準入力とするオープンルー
プ制御とし、負荷電流，インバータ電流またはこれらと
負荷電圧から負荷の無効電力成分電流及びインバータの
無効電力成分電流を検出し、負荷側の無効電力成分電流
からインバータの供給する無効電流量を作成し、インバ
ータの無効電力成分電流量とインバータの内部インピー
ダンスからインバータの内部インピーダンス電圧降下量
を演算して前記基準電圧量に補正をかけると共に、負荷
側の無効電力成分電流及びインバータの無効電力成分電
流と系統側のインピーダンスから系統側のインピーダン
ス電圧降下量を演算して前記基準電圧量に補正をかけ、
更に、前記インバータの供給する無効電力成分電力量と
インバータの無効電力成分電流との偏差を増幅して前記
基準電圧量に加算してオープンループ制御の誤差を補う
フィードバック制御するものである。In order to achieve the above object, the present invention provides voltage control in reactive power compensation control using a self-excited inverter that compensates reactive power of a load by voltage control and frequency control. , Open-loop control with a reference voltage equal to the reference voltage equivalent to the induced voltage of the system when there is no load, and load current, inverter current, or the reactive power component current of the load and reactive power component current of the inverter from these and load voltage The amount of reactive current supplied by the inverter is created from the reactive power component current on the load side, and the internal impedance voltage drop amount of the inverter is calculated from the reactive power component current amount of the inverter and the internal impedance of the inverter to calculate the reference voltage amount. The reactive power component current on the load side, the reactive power component current on the inverter side and the inverter side on the system side. And calculates the impedance voltage drop of the system side by correcting the reference voltage value from-impedance,
Further, the deviation between the reactive power component electric energy supplied by the inverter and the reactive power component current of the inverter is amplified and added to the reference voltage amount to perform feedback control for compensating the error of the open loop control.
【００１０】[0010]
【作用】負荷側の無効電力成分電流がインバータの定格
電流以内の場合はオープン電圧制御回路の基準入力にイ
ンバータの内部インピーダンス電圧降下量が加算される
ので、インバータの出力電圧はインバータの内部インピ
ーダンス電圧降下量分補正され系統側電圧と一致する。
また、負荷側の無効電力成分電流がインバータの定格電
流を越えた場合はオープンループ電圧制御回路の入力に
前記に加えて系統側のリアクタンス電圧降下量が加算さ
れて系統側のリアクタンス電圧降下量分も補正される。
このオープンループ制御により無効電力は高速で制御さ
れる。フィードバック制御手段は遅れを有し偏差がなく
なるように制御することで、オープンループ制御で生ず
る制御偏差を補う。[Function] When the reactive power component current on the load side is within the rated current of the inverter, the internal impedance voltage drop of the inverter is added to the reference input of the open voltage control circuit, so the output voltage of the inverter is the internal impedance voltage of the inverter. It is corrected by the amount of drop and matches the grid voltage.
Also, when the reactive power component current on the load side exceeds the rated current of the inverter, the reactance voltage drop on the system side is added to the input of the open loop voltage control circuit in addition to the above, and the reactance voltage drop on the system side is added. Is also corrected.
By this open loop control, the reactive power is controlled at high speed. The feedback control means compensates for the control deviation caused by the open loop control by controlling the delay so that the deviation disappears.
【００１１】[0011]
実施例１ 実施例１を図１、図２について説明する。図１につい
て、４は交流リアクトルＬ1を介して系統配電線２に接
された直流側にコンデンサＣ1を有するインバータ、６
はインバータの制御回路、８は計器用変圧器ＰＴ1で検
出した負荷電圧ＶL、変流器ＣＴ1，ＣＴ2で検出した負
荷電流ｉL，インバータ電流ｉiから負荷の無効電力成分
電流ｉxL及びインバータの無効電力成分電流ｉxiを検出
して電流信号をインバータの制御回路に出力する無効電
力成分電流検出回路である。Example 1 Example 1 will be described with reference to FIGS. 1 and 2. In FIG. 1, 4 is an inverter having a capacitor C 1 on the DC side connected to the system distribution line 2 via an AC reactor L 1 , 6
The control circuit of the inverter, 8 load voltage V L detected by the potential transformer PT 1, current transformer CT 1, CT 2 load current detected by the i L, the inverter current i i from the reactive power component current i of the load It is a reactive power component current detection circuit that detects xL and the reactive power component current i xi of the inverter and outputs a current signal to the control circuit of the inverter.
【００１２】図２はインバータの制御回路６の構成を示
すもので、１１は検出した電流ｉｘＬをインバータの定
格電流に制限してインバータの供給する無効電力成分電
流量ｉｘＬ’を作成するリミッタ、１２はこのリミッタ
からの電流ｉxL’とインバータの内部インピーダンスＺ
i≒Ｘiからインバータ内部インピーダンス電圧降下量Ｘ
i・ｉxL’を演算して第２の補正信号△Ｖ2として出力す
る第１の基準電圧補正回路、１３は電流ｉxLとｉxiから
インバータの定格電流を越えたときから系統側に流れて
いる無効電力成分電流量（ｉxL−ｉxi）を作成してこれ
と系統側のインピーダンスＺ0≒Ｘ0から系統側のインピ
ーダンス電圧降下量Ｘ0（ｉxL−ｉx0）を演算して第２
の補正信号△Ｖ2として出力する第２の基準電圧補正回
路、１４は電流ｉxLとｉxiの偏差を増幅する無効電力成
分電流偏差増幅回路、１５は基準電圧Ｖ0と偏差増幅回
路１４からの偏差増幅信号及び補正回路１２，１３から
の第１、第２の補正信号△Ｖ1，△Ｖ2を加算する加算
器、１６は加算器１５からの電圧信号が入力する基準電
圧Ｖ0を基準入力とした電圧制御回路、１７は負荷電圧
ＶLから系統電圧の同期信号を検出する同期回路、１８
はこの同期信号が入力する周波数制御回路、１９は制御
回路１６，１７からの信号によりインバータ４のスイッ
チング素子のゲートを制御するゲート制御回路である。FIG. 2 shows the configuration of the control circuit 6 of the inverter. Reference numeral 11 is a limiter for limiting the detected current i xL to the rated current of the inverter to create a reactive power component current amount i xL 'supplied by the inverter. , 12 are the current i xL 'from this limiter and the internal impedance Z of the inverter.
i ≈ X i to inverter internal impedance voltage drop X
A first reference voltage correction circuit that calculates i · i xL 'and outputs it as a second correction signal ΔV 2 , 13 flows from the currents i xL and i xi to the grid side when the rated current of the inverter is exceeded. and that the reactive power component current amount impedance (i xL -i xi) to create it and the system-side Z 0 ≒ X 0 from the system side of the impedance voltage drop amount X 0 (i xL -i x0) and calculates Second
Second reference voltage correction circuit for outputting as a correction signal ΔV 2 of the above, 14 is a reactive power component current deviation amplification circuit for amplifying the deviation between the currents ixL and i xi , 15 is a reference voltage V 0 and deviation from the deviation amplification circuit 14. the first from the deviation amplified signal and the correction circuits 12 and 13, the second correction signal △ V 1, adder for adding △ V 2, 16 is a reference voltage V 0 of the voltage signal input from the adder 15 A voltage control circuit used as a reference input, 17 is a synchronizing circuit for detecting a synchronizing signal of a system voltage from the load voltage V L , 18
Is a frequency control circuit to which this synchronizing signal is input, and 19 is a gate control circuit which controls the gate of the switching element of the inverter 4 by the signals from the control circuits 16 and 17.
【００１３】次に、この実施例の動作について説明す
る。Next, the operation of this embodiment will be described.
【００１４】系統側のインピーダンスをＺ0，インバー
タの内部インピーダンスをＺi，負荷の無効電力成分の
電流をＩxi，インバータの無効電力成分の電流をＩxi，
系統の電圧をＶ0，インバータ電圧をＶi，また負荷電流
をＩxL，インバータ電流をＩxi，系統電流Ｉx0とする
と、下記の式が成立する。The impedance on the system side is Z 0 , the internal impedance of the inverter is Z i , the current of the reactive power component of the load is I xi , the current of the reactive power component of the inverter is I xi ,
When the system voltage is V 0 , the inverter voltage is V i , the load current is I xL , the inverter current is I xi , and the system current I x0 , the following formula is established.
【００１５】[0015]
【数１】 [Equation 1]
【００１６】周波数制御は、従来同様に負荷電圧ＶLか
ら同期回路１７を通して系統電圧Ｖ0とインバータの電
圧Ｖiの電圧の位相が等しくなるように、周波数制御回
路１８，ゲート制御回路にてインバータの周波数を制御
する。In the frequency control, the inverter is controlled by the frequency control circuit 18 and the gate control circuit so that the phase of the system voltage V 0 and the voltage of the inverter V i become equal from the load voltage V L through the synchronizing circuit 17 as in the conventional case. Control the frequency of.
【００１７】電圧制御は、系統電圧Ｖ0と等価量の基準
電圧Ｖ0を電圧制御回路１６の基準入力として、これに
ｉxL・Ｘiに相当する補正信号△Ｖ1及びＸ0（ｉxL−ｉ
xi）に相当する補正信号△Ｖ2加算して、インバータの
出力電圧を制御する。The voltage control, the reference voltage V 0 which system voltage V 0 equivalent amount as a reference input of the voltage control circuit 16, to which is equivalent to i xL · X i correction signal △ V 1 and X 0 (i xL -I
xi ) corresponding to the correction signal ΔV 2 is added to control the output voltage of the inverter.
【００１８】これにより負荷の無効電力成分電流がイン
バータの定格以内の場合は、インバータは基準電圧Ｖ0
＋補正信号△Ｖ1の信号により出力電圧がＶi＝Ｖ0＋Ｘi
Ｉiとなるように、インバータの内部リアクタンス降下
を補償する電圧制御がなされ、Ｉxi＝ＩxLとなるように
インバータ出力電流が出るので、ＶL≒Ｖ0となる。As a result, when the reactive power component current of the load is within the rating of the inverter, the inverter outputs the reference voltage V 0.
The output voltage is V i = V 0 + X i due to the + correction signal ΔV 1.
The voltage is controlled so as to compensate the internal reactance drop of the inverter so that I i is obtained, and the inverter output current is output so that I xi = I xL is obtained, so that V L ≈V 0 .
【００１９】また、負荷の無効電力成分電流がインバー
タの定格電流を越える場合は、インバータは基準電圧Ｖ
0に補正信号△Ｖ1，△Ｖ2を加算した信号により出力電
圧がＶi＝Ｖ0−Ｘ0（ＩxL−Ｉxi）＋ＸiＩiとなるよう
に、インバータの定格電流を流すために発生するリアク
タンス電圧降下分と（Ｘi・Ｉxi）と系統のリアクタン
スで電圧降下分（−Ｘ0（ＩxL−Ｉxi）の補償をする電
圧制御がなされ、ＩxL＞Ｉxiによる負荷電圧ＶLが系統
電圧Ｖ0より低下するのを抑制する。Further, when the reactive power component current of the load exceeds the rated current of the inverter, the inverter outputs the reference voltage V.
In order to flow the rated current of the inverter so that the output voltage becomes V i = V 0 −X 0 (I xL −I xi ) + X i I i by the signal obtained by adding the correction signals ΔV 1 and ΔV 2 to 0. The voltage control is performed to compensate for the voltage drop (−X 0 (I xL −I xi )) by the reactance voltage drop that occurs at (X i · I xi ) and the system reactance, and the load due to I xL > I xi It is possible to prevent the voltage V L from lowering than the system voltage V 0 .
【００２０】ただし、上記の制御はオープン制御のため
に制御精度が確保できない。無効電力成分電流偏差増幅
回路はｉxL’とｉxiとの偏差をＰＩ増幅した遅れを有す
る偏差信号を加算器１５に出力し、偏差がなくなるよう
にフィードバック制御するので、上記オープン制御によ
る制御誤差量はなくなり、高精度の制御ができる。However, since the above control is open control, control accuracy cannot be ensured. The reactive power component current deviation amplifier circuit outputs a deviation signal having a delay obtained by PI-amplifying the deviation between i xL 'and i xi to the adder 15 and performs feedback control so that the deviation disappears. There is no quantity, and highly accurate control is possible.
【００２１】したがって、この実施例によれば、遅れの
ないオープンループの補正信号△Ｖ1と△Ｖ2で高速制御
ができ、遅れをもたせたフィードバック制御で高精度の
制御ができる。Therefore, according to this embodiment, high-speed control can be performed by the open loop correction signals ΔV 1 and ΔV 2 , and high-precision control can be performed by the feedback control with a delay.
【００２２】実施例２ 実施例２を図４，図５について説明する。図４におい
て、４は図１の場合と同様に交流リアクトルＬ1を介し
て系統配電線２に接続された直流側にコンデンサＣ1を
有するインバータ、６はインバータの制御回路、８は計
器用変圧器ＰＴ1で検出した負荷電圧ＶＬ、変流器ＣＴ1
〜ＣＴ3で検出した系統側電流ｉ0，負荷電流ｉL，イン
バータ電流ｉiから系統側無効電力成分電流ｉx0，負荷
無効電力成分電流ｉxL，インバータ無効電力成分電流ｉ
xiを検出する無効電力成分電流検出回路である。Second Embodiment A second embodiment will be described with reference to FIGS. In FIG. 4, 4 is an inverter having a capacitor C 1 on the DC side connected to the system distribution line 2 via an AC reactor L 1 as in the case of FIG. 1, 6 is an inverter control circuit, and 8 is an instrument transformer. Load voltage VL detected by transformer PT 1 , current transformer CT 1
To system side current i 0 , load current i L , and inverter current i i detected from CT 3 to system side reactive power component current i x0 , load reactive power component current i xL , inverter reactive power component current i
It is a reactive power component current detection circuit that detects xi .
【００２３】図５はインバータの制御回路６の構成を示
すもので、１３’は電流ｉx0からｉx0・Ｘ0を演算して
第２の補正電圧△Ｖ2を出力する第２の基準電圧補正回
路である。その他の構成は図２の回路と変わりがないの
で、同一構成部分には同一符号を付して重複する説明を
省略する。電流ｉx0＝ｉxL−ｉxiであるので、この実施
例によれば、実施例１と同様の原理で無効電力補償をす
ることができる。FIG. 5 shows the configuration of the control circuit 6 of the inverter. Reference numeral 13 'is the second reference voltage for calculating the currents i x0 to i x0.X 0 and outputting the second correction voltage ΔV 2. It is a correction circuit. Since the other configurations are the same as those of the circuit of FIG. 2, the same components are designated by the same reference numerals and the duplicate description will be omitted. Since the current i x0 = ix L −i xi , according to this embodiment, reactive power compensation can be performed according to the same principle as that of the first embodiment.
【００２４】[0024]
【発明の効果】本発明は、上述のように、自励式インバ
ータを使用し、系統側で発生するリアクタンス電圧降下
及びインバータの内部リアクタンス降下を負荷及びイン
バータの無効電力成分の電流から演算し、これらリアク
タンス電圧降下信号と、負荷及びインバータの無効電力
成分の電流の偏差のＰＩ増幅信号を系統電圧と等価量の
基準電圧信号に加算した信号で、インバータを電圧制御
負荷の無効電力補償をしているので、制御がオープン制
御とフィードバック制御となり、オープン制御により高
速制御ができると共に遅れをもたせたフィードバック制
御で高精度の制御ができる。このため無効電力が急激に
変動する負荷が発生しても系統電圧を緩和することがで
きる。As described above, the present invention uses the self-excited inverter, calculates the reactance voltage drop generated on the system side and the internal reactance drop of the inverter from the current of the reactive power component of the load and the inverter, and The reactance voltage drop signal and the PI amplification signal of the current deviation of the reactive power component of the load and the inverter are added to the reference voltage signal equivalent to the system voltage to compensate the inverter for the reactive power of the voltage controlled load. Therefore, the control is open control and feedback control, and high-speed control can be performed by the open control and high-precision control can be performed by the feedback control with a delay. Therefore, the system voltage can be relaxed even if a load in which the reactive power fluctuates rapidly occurs.
【図１】実施例１を示す全体構成図。FIG. 1 is an overall configuration diagram showing a first embodiment.
【図２】インバータの制御回路を示すブロック図。FIG. 2 is a block diagram showing a control circuit of an inverter.
【図３】電圧補正量を説明する線図。FIG. 3 is a diagram illustrating a voltage correction amount.
【図４】実施例２を示す全体構成図。FIG. 4 is an overall configuration diagram showing a second embodiment.
【図５】インバータの制御回路を示すブロック図。FIG. 5 is a block diagram showing a control circuit of an inverter.
【図６】従来例を示す全体構成図。FIG. 6 is an overall configuration diagram showing a conventional example.
２…系統配電線 ４…インバータ ６…制御回路 ８…無効電流検出回路 １１…リミッタ １２，１３，１３’…基準電圧補正回路 １４…無効電力成分電流偏差増幅回路 １６…電圧制御回路 １７…同期回路 １８…周波数制御回路 １９…ゲート制御回路 ｉxL…負荷の無効電力成分電流 ｉxi…インバータの無効電力成分電流 ｉx0…系統側の無効電力成分電流 △Ｖ1…インバータの内部リアクタンス電圧降下補正量 △Ｖ2…系統側のリアクタンス電圧降下補正量2 ... System distribution line 4 ... Inverter 6 ... Control circuit 8 ... Reactive current detection circuit 11 ... Limiter 12, 13, 13 '... Reference voltage correction circuit 14 ... Reactive power component current deviation amplification circuit 16 ... Voltage control circuit 17 ... Synchronous circuit 18 ... Frequency control circuit 19 ... Gate control circuit ixL ... Reactive power component current of load i xi ... Reactive power component current of inverter i x0 ... Reactive power component current of system side ΔV 1 ... Internal reactance voltage drop correction amount of inverter ΔV 2 … Reactance voltage drop correction amount on the system side
Claims (2)
電力を補償する自励式インバータを使用した無効電力補
償の制御において、 電圧制御を、系統の無負荷時の誘起電圧と等価な基準電
圧量を基準入力とするオープンループ制御とし、 負荷電流，インバータ電流またはこれらと負荷電圧から
負荷の無効電力成分電流及びインバータの無効電力成分
電流を検出し、 負荷側の無効電力成分からインバータの供給する無効電
力成分電流量を作成し、 インバータの無効電力成分電流量とインバータの内部イ
ンピーダンスからインバータの内部インピーダンス電圧
降下量を演算して前記基準電圧量に補正をかけると共
に、負荷側の無効電力成分電流及びインバータの無効電
力成分電流と系統側のインピーダンスから系統側のイン
ピーダンス電圧降下量を演算して前記基準電圧量に補正
をかけ、 更に、前記インバータの供給する無効電力成分電流量と
インバータの無効電力成分電流との偏差を増幅して前記
基準電圧量に加算してオープンループ制御の誤差を補う
フィードバック制御する、 ことを特徴とした無効電力補償の制御方法。1. In reactive power compensation control using a self-excited inverter that compensates reactive power of a load by voltage control and frequency control, voltage control is performed by setting a reference voltage amount equivalent to an induced voltage when the system is unloaded. The open loop control is used as the reference input, and the reactive power component current of the load and the reactive power component current of the inverter are detected from the load current, the inverter current or these and the load voltage, and the reactive power supplied by the inverter from the reactive power component on the load side. A component current amount is created, and the internal impedance voltage drop amount of the inverter is calculated from the reactive power component current amount of the inverter and the internal impedance of the inverter to correct the reference voltage amount. From the reactive power component current and the impedance on the system side to the impedance voltage drop on the system side Is calculated to correct the reference voltage amount, and further, the deviation between the reactive power component current amount supplied by the inverter and the reactive power component current of the inverter is amplified and added to the reference voltage amount to perform open loop control. A reactive power compensation control method characterized by performing feedback control that compensates for the error of.
電力を補償する自励式インバータを使用した無効電力補
償の制御において、 電圧制御を、系統の無負荷時の誘起電圧と等価な基準電
圧量を基準入力とするオープンループ制御とし、 系統側電流，負荷電流，インバータ電流またはこれらと
負荷電圧から系統側の無効電力成分電流と負荷の無効電
力成分電流及びインバータの無効電力成分電流を検出
し、 負荷側の無効電力成分電流からインバータの供給する無
効電力成分電流量を作成し、 インバータの無効電力成分電流量とインバータの内部イ
ンピーダンスからインバータの内部インピーダンス電圧
降下量を演算して前記基準電圧量に補正をかけると共
に、系統側の無効電力成分電流と系統側のインピーダン
スから系統側のリアクタンス電圧降下量を演算して前記
基準電圧量に補正をかけ、 更に、前記インバータの供給する無効電力成分電流量と
インバータの無効電力成分電流との偏差を増幅し、その
出力を前記基準電圧量に加算してオープンループ制御の
誤差を補うフィードバック制御する、 ことを特徴とした無効電力補償の制御方法。2. In reactive power compensation control using a self-excited inverter that compensates reactive power of a load by voltage control and frequency control, voltage control is performed by setting a reference voltage amount equivalent to an induced voltage when the system is unloaded. The open-loop control is used as the reference input, and the reactive power component current on the system side, the reactive power component current on the load and the reactive power component current on the inverter are detected from the system side current, load current, inverter current or these and load voltage, and the load The reactive power component current amount supplied by the inverter is created from the reactive power component current on the side, and the internal impedance voltage drop amount of the inverter is calculated from the reactive power component current amount of the inverter and the internal impedance of the inverter to correct it to the reference voltage amount. And the reactive power on the system side from the reactive power component current on the system side and the impedance on the system side. The amount of pressure drop is calculated to correct the reference voltage amount, and further, the deviation between the reactive power component current amount supplied by the inverter and the reactive power component current of the inverter is amplified, and its output is set to the reference voltage amount. A reactive power compensation control method characterized by adding and performing feedback control to compensate for an error in open loop control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7171699A JPH0923585A (en) | 1995-07-07 | 1995-07-07 | Reactive power compensation control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7171699A JPH0923585A (en) | 1995-07-07 | 1995-07-07 | Reactive power compensation control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0923585A true JPH0923585A (en) | 1997-01-21 |
Family
ID=15928047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7171699A Pending JPH0923585A (en) | 1995-07-07 | 1995-07-07 | Reactive power compensation control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0923585A (en) |
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|---|---|---|---|---|
| GB2348519A (en) * | 1999-03-31 | 2000-10-04 | Delta Electronics Inc | Compensating converter output power factor |
| KR100333090B1 (en) * | 1999-11-24 | 2002-04-22 | 권영한 | Apparatus and method for compensating power quality of power distribution line |
| KR100472528B1 (en) * | 2002-04-09 | 2005-03-07 | 건국대학교 산학협력단 | Method of controlling single loop voltage controller for 3 phase PWM inverter |
| JP2008210145A (en) * | 2007-02-26 | 2008-09-11 | Central Res Inst Of Electric Power Ind | Power conversion system control method and power conversion system using the control method |
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| JPH03103031A (en) * | 1989-09-16 | 1991-04-30 | Meidensha Corp | Power supply active filter |
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