JPH0965574A - Control of self-excited reactive power compensating device - Google Patents
Control of self-excited reactive power compensating deviceInfo
- Publication number
- JPH0965574A JPH0965574A JP7213500A JP21350095A JPH0965574A JP H0965574 A JPH0965574 A JP H0965574A JP 7213500 A JP7213500 A JP 7213500A JP 21350095 A JP21350095 A JP 21350095A JP H0965574 A JPH0965574 A JP H0965574A
- Authority
- JP
- Japan
- Prior art keywords
- inverter
- voltage
- power
- capacity
- small
- 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.)
- Withdrawn
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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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電力系統の電圧変
動抑制やフリッカ対策等に使用される自励式無効電力補
償装置（以下、自励式ＳＶＣと称する）の制御方法で、
詳しくは、大容量矩形波インバータと小容量ＰＷＭイン
バータを直列接続した自励式ＳＶＣにおける小容量ＰＷ
Ｍインバータの制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for a self-excited reactive power compensator (hereinafter referred to as self-excited SVC) used for suppressing voltage fluctuations in a power system, flicker countermeasures, and the like.
Specifically, a small capacity PW in a self-excited SVC in which a large capacity rectangular wave inverter and a small capacity PWM inverter are connected in series.
The present invention relates to a control method for an M inverter.
【０００２】[0002]
【従来の技術】変電所等の系統電源とアーク炉や電鉄負
荷等の変動負荷を有する電力系統における系統電源と変
動負荷の間に設置される自励式ＳＶＣとして、本出願人
は先に、大容量矩形波インバータと小容量ＰＷＭインバ
ータを直列多重したものを提案した［特願平６−５５２
２号］。2. Description of the Related Art As a self-excited SVC installed between a system power source such as a substation and a system power source and a variable load in an electric power system having a variable load such as an arc furnace or an electric railway load, the present applicant has previously proposed We proposed a series multiplex of a capacity rectangular wave inverter and a small capacity PWM inverter [Japanese Patent Application No. 6-552].
No. 2].
【０００３】この自励式ＳＶＣの主回路を図２に示し説
明すると、系統電源１と変動負荷３の間の系統母線２に
設置される自励式ＳＶＣ４は、大容量矩形波インバータ
５と小容量ＰＷＭインバータ６とを、夫々のインバータ
容量に応じた変圧器７、８を介して直列接続される。大
容量矩形波インバータ５は、高耐圧でスイッチング周波
数の低いＧＴＯのスイッチング素子を使用したインバー
タで、直流コンデンサ９とその充電器１０、初期充電用
の開閉器１１の電源部を備える。小容量ＰＷＭインバー
タ６は、スイッチング周波数の高いスイッチング素子を
使用したＰＷＭ方式（パルス幅変調方式）のインバータ
で、直流コンデンサ１２とこれを充電する整流器１３の
電源部を備える。The main circuit of the self-excited SVC is shown in FIG. 2 and explained. The self-excited SVC 4 installed on the system bus 2 between the system power supply 1 and the variable load 3 has a large capacity rectangular wave inverter 5 and a small capacity PWM. The inverter 6 is connected in series via the transformers 7 and 8 according to the respective inverter capacities. The large-capacity rectangular wave inverter 5 is an inverter using a GTO switching element having a high withstand voltage and a low switching frequency, and includes a DC capacitor 9, a charger 10 for the DC capacitor 9, and a power supply unit for a switch 11 for initial charging. The small-capacity PWM inverter 6 is a PWM (pulse width modulation) inverter that uses a switching element having a high switching frequency, and includes a DC capacitor 12 and a power supply unit for a rectifier 13 that charges the DC capacitor 12.
【０００４】自励式ＳＶＣ４が系統母線２に連系される
前段階で大容量矩形波インバータ５の開閉器１１がオン
されると、充電器１０で直流コンデンサ９が定格電圧ま
で初期充電されて大容量矩形波インバータ５が作動し、
変圧器７の一次側に系統母線２の母線電圧ＶA とほぼ同
等の矩形波インバータ電圧ＶB を発生させる。この段階
でＳＶＣ４が系統母線２に連系され、開閉器１１がオフ
される。大容量矩形波インバータ５は、矩形波インバー
タ電圧ＶB の位相を母線電圧ＶA に対して若干位相制御
することで、系統母線２から有効電力を引き込んで初期
充電後の直流コンデンサ９を充電し、その直流電圧を定
格に維持すると共に、内部損失電力の補充を行う。When the switch 11 of the large-capacity rectangular wave inverter 5 is turned on before the self-excited SVC 4 is connected to the system bus 2, the DC capacitor 9 is initially charged by the charger 10 to the rated voltage, and the The capacity rectangular wave inverter 5 operates,
On the primary side of the transformer 7, a rectangular wave inverter voltage V B which is almost equal to the bus voltage VA of the system bus 2 is generated. At this stage, the SVC 4 is connected to the system bus 2 and the switch 11 is turned off. The large-capacity rectangular wave inverter 5 draws active power from the system bus 2 and charges the DC capacitor 9 after initial charging by slightly controlling the phase of the rectangular wave inverter voltage V B with respect to the bus voltage VA . , Maintain the DC voltage at the rated value and supplement the internal power loss.
【０００５】小容量ＰＷＭインバータ６の直流コンデン
サ１２は、整流器１３からの整流器電流（補機電流）Ｉ
R で充電され、その直流電圧ＥF を電源に小容量ＰＷＭ
インバータ６が作動して、変圧器８の一次側に母線電圧
ＶA の約１０〜２０％のＰＷＭインバータ電圧ＶF を発
生する。ＰＷＭインバータ電圧ＶF は、系統母線２にお
ける負荷変動に応じた補償電流指令値に基づく無効電流
を生成するための電圧成分で、これの振幅を負荷変動に
追従させて変調することで、変動負荷３に発生した無効
電流と逆位相の補償電流ＩC が系統に生成されて、負荷
変動に伴う母線電圧ＶA の変動が抑制される。なお、小
容量ＰＷＭインバータ６の直流コンデンサ１２は、イン
バータ運転中継続して整流器電流ＩR で充電され、内部
損失電力の補充が行われる。The DC capacitor 12 of the small capacity PWM inverter 6 has a rectifier current (auxiliary device current) I from the rectifier 13.
It is charged by R , and its direct current voltage E F is used as a power source and small capacity PWM
The inverter 6 operates to generate a PWM inverter voltage V F on the primary side of the transformer 8 which is approximately 10 to 20% of the bus voltage V A. The PWM inverter voltage V F is a voltage component for generating a reactive current based on the compensation current command value according to the load fluctuation in the system bus 2. By modulating the amplitude of this reactive component to follow the load fluctuation, the variable load A compensating current I C having a phase opposite to the reactive current generated in No. 3 is generated in the system, and the fluctuation of the bus voltage VA due to the load fluctuation is suppressed. The DC capacitor 12 of the small capacity PWM inverter 6 is continuously charged with the rectifier current I R during the operation of the inverter to replenish the internal loss power.
【０００６】小容量ＰＷＭインバータ６の制御は、図３
に示すような電流フィードバック制御方式で行われる。
即ち、系統母線２から検出された負荷電流ＩL を補償電
流演算回路１５で演算処理して得た補償電流指令信号Ｉ
C REFと実際の補償電流ＩC との差を減算器１６で求め、
この差が小さくなるように電流制御伝達関数回路１７で
フィードバック制御した制御信号から出力電圧指令信号
ＶF REFを得る。出力電圧指令信号ＶF REFがＰＷＭ回路１
８を介することで、小容量ＰＷＭインバータ６のスイッ
チング素子をオンオフさせるゲートパルス信号が発生し
て、小容量ＰＷＭインバータ６が制御される。The control of the small capacity PWM inverter 6 is shown in FIG.
The current feedback control method as shown in FIG.
That is, the compensation current command signal I obtained by calculating the load current I L detected from the system bus 2 by the compensation current calculation circuit 15
The subtracter 16 calculates the difference between C REF and the actual compensation current I C ,
The output voltage command signal V F REF is obtained from the control signal feedback-controlled by the current control transfer function circuit 17 so that this difference becomes small. The output voltage command signal V F REF is the PWM circuit 1
Through 8, the gate pulse signal for turning on / off the switching element of the small capacity PWM inverter 6 is generated, and the small capacity PWM inverter 6 is controlled.
【０００７】[0007]
【発明が解決しようとする課題】上記自励式ＳＶＣ４の
系統連系後の運転時において、大容量矩形波インバータ
５の場合は、充電器１０が切離されて母線電圧ＶA と同
等の電圧ＶB を出力するので問題無い。ところが、小容
量ＰＷＭインバータ６においては、直流コンデンサ１２
が整流器電流ＩR で充電が継続されて電流フィードバッ
ク制御されている結果、電流制御系の誤差等でもってＰ
ＷＭインバータ電圧ＶF と補償電流ＩC の位相差が９０
゜から変動して、系統内外のインバータ電力流出入が発
生し、直流コンデンサ１２の異常充電や、整流器電流Ｉ
R の異常な増大による過負荷が発生することがあった。In the operation of the self-excited SVC 4 after the grid interconnection, in the case of the large capacity rectangular wave inverter 5, the charger 10 is disconnected and the voltage V A equal to the bus voltage V A. Since B is output, there is no problem. However, in the small capacity PWM inverter 6, the DC capacitor 12
Is continuously charged with the rectifier current I R and current feedback control is performed, resulting in P due to an error in the current control system.
The phase difference between the WM inverter voltage V F and the compensation current I C is 90.
Fluctuating from the degree, the inverter power flows in and out of the system, causing abnormal charging of the DC capacitor 12 and rectifier current I.
Occasionally an overload occurred due to an abnormal increase in R.
【０００８】即ち、小容量ＰＷＭインバータ６におい
て、変圧器等の漏れインピーダンスをＺT ＝ＲT ＋ｊＸ
T とすると、補償電流ＩC は次式となる。 ＩC ＝｛ＶA −（ＶF ＋ＶB）｝／ＺT That is, in the small capacity PWM inverter 6, the leakage impedance of a transformer or the like is set to Z T = R T + jX.
Assuming T , the compensation current I C is given by the following equation. I C = {V A − (V F + V B )} / Z T
【０００９】ここで、ＶA ≒ＶB とすれば、ＩC ＝−Ｖ
F ／ＺT であり、ＶF ＝−ＩC ＺTである。また、小容
量ＰＷＭインバータ６のインバータ電力ＰF は、理想的
には ＰF ＝｜ＶFＩC｜＝−ＲT｜ＩC｜2 で表されるが、実際には上記した電流制御系の誤差等で
誤差電圧ＶE が生じると、ＶF ＝−ＩC ＺT ＋ＶE とな
り、結果としてインバータ電力ＰF は次の式となる。 ＰF ＝−ＲT｜ＩC｜2 ＋ＶE ＩC ・・・・・If V A ≈V B , then I C = −V
An F / Z T, a V F = -I C Z T. Further, the inverter power P F of the small capacity PWM inverter 6 is ideally expressed as P F = | V F I C | = −R T | I C | 2 , but in reality, the current control system described above is used. When the error voltage V E is generated due to the error of V F = -I C Z T + V E , the inverter power P F is as follows. P F = -R T | I C | 2 + V E I C
【００１０】式における電力成分ＶE ＩC が小容量Ｐ
ＷＭインバータ６に出入りするインバータ電力誤差成分
であり、この流出入するインバータ電力誤差成分はＩC
が正負に変化したり、ＶE が推定不可能であることから
定量的に把握できない。そのため、インバータ電力誤差
成分が許容値を超えて流入すると、整流器１３で遮断さ
れて直流コンデンサ１２を異常に充電する不具合が発生
したり、逆に、インバータ電力誤差成分が許容値を超え
て流出すると、整流器電流ＩR が増大して充電回路側が
直流過電圧となる問題が発生していた。The power component V E I C in the equation is a small capacity P
It is an inverter power error component that goes in and out of the WM inverter 6, and this inflow and outflow inverter power error component is I C
Cannot be quantitatively grasped because V changes to positive or negative and V E cannot be estimated. Therefore, if the inverter power error component exceeds the allowable value, a problem occurs that the DC power is blocked by the rectifier 13 and the DC capacitor 12 is abnormally charged. Conversely, if the inverter power error component exceeds the allowable value, the inverter power error component flows out. However, there has been a problem that the rectifier current I R increases and the charging circuit side becomes a DC overvoltage.
【００１１】本発明の目的は、小容量ＰＷＭインバータ
の運転時の電力誤差成分のインバータ内外への流出入を
抑制する制御方法を提供することにある。An object of the present invention is to provide a control method for suppressing the inflow / outflow of the power error component into / out of the inverter during the operation of the small capacity PWM inverter.
【００１２】[0012]
【課題を解決するための手段】本発明は上記目的を達成
するため、変動負荷を有する系統母線の母線電圧と同等
の電圧を大容量変圧器を介して出力する大容量矩形波イ
ンバータと、系統母線の負荷変動を抑制する補償電圧を
小容量変圧器を介して出力する小容量ＰＷＭインバータ
とを、直列接続した自励式無効電力補償装置における小
容量ＰＷＭインバータの制御を、小容量ＰＷＭインバー
タの直流電圧及び直流コンデンサを充電する整流器電流
が夫々に予め設定された設定値以上に変動したときの変
動値に応じた電力制御信号と系統母線の負荷変動に応じ
た補償電流指令信号を乗じた振幅調整信号を、補償電流
指令信号と補償電流を減算してその差が小さくなるよう
にフィードバック制御して得た出力電流制御信号に加算
し、この加算して得られた電圧信号をＰＷＭインバータ
出力電圧指令信号として行うことを特徴とする。In order to achieve the above object, the present invention provides a large capacity rectangular wave inverter for outputting a voltage equivalent to the bus voltage of a system bus having a variable load through a large capacity transformer, and a system. Control of a small capacity PWM inverter in a self-excited reactive power compensator in which a small capacity PWM inverter that outputs a compensating voltage that suppresses a load fluctuation of a bus is output via a small capacity transformer. Amplitude adjustment by multiplying the power control signal according to the fluctuation value and the compensation current command signal according to the load fluctuation of the system bus when the rectifier current charging the voltage and the DC capacitor respectively fluctuates more than the preset value. The signal is added to the output current control signal obtained by subtracting the compensation current command signal and the compensation current and performing feedback control so that the difference becomes small. And performing a voltage signal which is a PWM inverter output voltage command signal.
【００１３】ここで、小容量ＰＷＭインバータにインバ
ータ電力誤差成分が流入すると、この流入電力で小容量
ＰＷＭインバータの直流コンデンサが充電されて直流電
圧が増加し、逆に、インバータ電力誤差成分が流出する
と、この流出電力を補充するために整流器電流が増大す
ることから、直流電圧と整流器電流の増加分を監視し、
この増加分が設定値以上のときにその増加分に基づく電
力制御信号から出力電圧指令信号を得て、この出力電圧
指令信号に含まれる電力誤差成分相当の信号で小容量Ｐ
ＷＭインバータに流出入するインバータ電力誤差成分を
キャンセルさせる。Here, when the inverter power error component flows into the small capacity PWM inverter, the DC power of the small capacity PWM inverter is charged by this inflow power and the DC voltage increases, and conversely, when the inverter power error component flows out. , Because the rectifier current increases to supplement this outflow power, the increase in DC voltage and rectifier current is monitored,
When the increment is equal to or larger than the set value, the output voltage command signal is obtained from the power control signal based on the increment, and the signal corresponding to the power error component included in the output voltage command signal is used to output the small capacity P.
The inverter power error component flowing in and out of the WM inverter is canceled.
【００１４】[0014]
【発明の実施の形態】以下、本発明方法を図２自励式Ｓ
ＶＣ４の小容量ＰＷＭインバータ６の制御に適用した実
施例を、図１の制御ブロックを参照して説明する。BEST MODE FOR CARRYING OUT THE INVENTION The method of the present invention will be described below with reference to FIG.
An embodiment applied to the control of the small capacity PWM inverter 6 of the VC 4 will be described with reference to the control block of FIG.
【００１５】自励式ＳＶＣ４の大容量矩形波インバータ
５の制御は従来同様に行われ、その説明は省略する。小
容量ＰＷＭインバータ６の制御は、図１の電流制御系に
示すように、まず、負荷電流ＩL を補償電流演算回路１
５で演算処理して得た補償電流指令値ＩC REFと、実際の
補償電流ＩC の差が小さくなるように電流制御伝達関数
回路１７でフィードバック制御した制御信号から出力電
流制御信号ＶI を求める。ここまでは図３の制御方法と
同様である。The control of the large-capacity rectangular wave inverter 5 of the self-excited SVC 4 is performed in the same manner as in the conventional case, and the description thereof will be omitted. Control of small-capacity PWM inverter 6, as shown in the current control system of FIG. 1, the compensation of the load current I L current calculation circuit 1
5, the output current control signal V I is obtained from the control signal feedback-controlled by the current control transfer function circuit 17 so that the difference between the compensation current command value I C REF obtained by the calculation process in 5 and the actual compensation current I C becomes small. Ask. Up to this point, the control method is the same as that shown in FIG.
【００１６】ここで電流制御系の誤差等で小容量ＰＷＭ
インバータ６に電力誤差成分のインバータ電力流出入が
発生したとする。この場合、インバータ電力誤差成分が
流入すると、直流コンデンサ１２が充電されて直流電圧
ＥF が上昇し、また、逆にインバータ電力誤差成分が流
出すると整流器電流ＩR が増大する。そこで、本発明に
おいては図１に示すように、直流電圧ＥF の電圧監視回
路２０と整流器電流Ｉ R （実効値）の電流監視回路２１
を設けて、次のような制御を行う。Here, small capacity PWM is caused by an error in the current control system or the like.
Inverter power flow of the power error component into the inverter 6
Suppose that it has occurred. In this case, the inverter power error component is
When flowing in, the DC capacitor 12 is charged and the DC voltage is
EF Rises, and conversely, the inverter power error component flows.
When output, rectifier current IR Will increase. Therefore, in the present invention
In addition, as shown in FIG.F Voltage monitoring times
Path 20 and rectifier current I R (Effective value) current monitoring circuit 21
Is provided and the following control is performed.
【００１７】電圧監視回路２０の側から先に説明する
と、電圧監視回路２０は減算器２２、リミッタ回路２
３、電力制御伝達関数回路２４で構成される。直流コン
デンサ１２の直流電圧ＥF と、流入インバータ電力誤差
成分が問題となる量に相当する設定値ＥF REFとを減算器
２２に入力し、直流電圧ＥF が問題となる設定値ＥF REF
以上になったときだけ［ＥF REF−ＥF ］の誤差信号をリ
ミッタ回路２３から電力制御伝達関数回路２４に出力す
る。電力制御伝達関数回路２４は、ＥF REF−ＥF ≦０の
ときのみ［ＥF REF−ＥF ］に比例する電力制御信号ｋを
出力する。ちなみにＥF REF＞ＥF のときは、ｋ＝０に相
当する。また、ここで比例係数Ｋ1 を設定して、 ｋ＝−Ｋ1（ＥF −ＥF REF） とする。ただし、比例係数Ｋ1 は、流入インバータ電力
誤差成分の大きさを演算するための正の定数である。Explaining from the voltage monitoring circuit 20 side first, the voltage monitoring circuit 20 includes a subtractor 22 and a limiter circuit 2.
3. A power control transfer function circuit 24. The direct current voltage E F of the direct current capacitor 12 and the set value E F REF corresponding to the amount in which the inflow inverter power error component is a problem are input to the subtractor 22, and the direct current voltage E F is a problem set value E F REF.
The output from the limiter circuit 23 to the power control transfer function circuit 24 the error signal only [E F REF -E F] at or over. Power control transfer function circuit 24 outputs a power control signal k which is proportional to [E F REF -E F] only when E F REF -E F ≦ 0. By the way, when E F REF > E F , it corresponds to k = 0. Further, where you set the proportional coefficient K 1, and k = -K 1 (E F -E F REF). However, the proportionality coefficient K 1 is a positive constant for calculating the magnitude of the inflow inverter power error component.
【００１８】電力制御伝達関数回路２４が電力制御信号
ｋを出力すると、これを負荷電流Ｉ L から求めた補償電
流指令値ＩC REFと乗算器３０で乗算して振幅調整信号ｋ
ＩC R EFを求める。そして、この振幅調整信号ｋＩC REFと
電流制御伝達関数回路１７からの出力電流制御信号ＶI
とを加算器３１で加算して、最終的な出力電圧指令信号
ＶF REFを得る。出力電圧指令信号ＶF REFがＰＷＭ回路１
８を介することで、小容量ＰＷＭインバータ６のスイッ
チング素子をオンオフさせるゲートパルス信号が発生し
て、小容量ＰＷＭインバータ６が制御される。The power control transfer function circuit 24 outputs the power control signal.
When k is output, this is changed to load current I L Compensation power calculated from
Flow command value IC REFIs multiplied by the multiplier 30 and the amplitude adjustment signal k
IC R EFAsk for. Then, this amplitude adjustment signal kIC REFWhen
Output current control signal V from the current control transfer function circuit 17I
And are added by the adder 31, and the final output voltage command signal
VF REFGet. Output voltage command signal VF REFIs the PWM circuit 1
8 through the switch of the small capacity PWM inverter 6
A gate pulse signal that turns on and off the
Thus, the small capacity PWM inverter 6 is controlled.
【００１９】以上の制御における出力電圧指令信号ＶF
REFは、ＶF REF＝ＶI ＋ｋＩC REFであるから、振幅調整
信号ｋＩC REFによるインバータ電力誤差成分は、［ｋＩ
C REF×ＩC ］となり、更に、ＩC REF≒ＩC であるからイ
ンバータ電力誤差成分は、ｋ｜ＩC ｜2となる。Output voltage command signal V F in the above control
Since REF is V F REF = V I + kI C REF , the inverter power error component due to the amplitude adjustment signal kI C REF is [kI
C REF × I C ], and since I C REF ≈I C , the inverter power error component is k | I C | 2 .
【００２０】つまり、電力制御信号ｋは、あたかも式
の可変抵抗成分と等価となり、以上の制御で小容量ＰＷ
Ｍインバータ６のインバータ電力ＰF は、次の式で与
えられる。 ＰF ≒（−ＲT＋ｋ）｜ＩC ｜2 ・・・・・That is, the power control signal k becomes equivalent to the variable resistance component of the equation, and the small capacity PW is obtained by the above control.
The inverter power P F of the M inverter 6 is given by the following equation. P F ≈ (-R T + k) | I C | 2 ...
【００２１】この式において、直流電圧ＥF が設定値
ＥF REF以上になったとき、電力制御信号ｋが負となって
出力電圧を増加させ、式の流入インバータ電力誤差成
分［ＶE ＩC ］をキャンセルする。その結果、流入イン
バータ電力誤差成分が抑制されて、直流コンデンサ１２
の異常な充電が回避され、インバータ電力ＰF が問題の
無い許容範囲に維持される。In this equation, when the DC voltage E F exceeds the set value E F REF , the power control signal k becomes negative to increase the output voltage, and the inflow inverter power error component [V E I C ] To cancel. As a result, the inflow inverter power error component is suppressed, and the DC capacitor 12
Abnormal charging is avoided, and the inverter power P F is maintained within a permissible range where there is no problem.
【００２２】次に、電流監視回路２１の側を説明する
と、電流監視回路２１も減算器２５、リミッタ回路２
６、電力制御伝達関数回路２７で構成される。この場
合、流出インバータ電力で整流器電流ＩR の実効値が、
これに対応して設定された設定値Ｉ R REF以上になると、
［ＩR REF−ＩR ］の誤差信号が減算器２５、リミッタ回
路２６から電力制御伝達関数回路２７に出力される。電
力制御伝達関数回路２７は、ＩR REF−ＩR ≦０のときの
み［ＩR REF−ＩR ］に比例する電力制御信号ｋを符号反
転させて出力する。ここで比例係数Ｋ2 を設定して、 ｋ＝＋Ｋ2（ＩR −ＩR REF） とする。ただし、比例係数Ｋ2 は、流出インバータ電力
の大きさを演算するための正の定数である。Next, the side of the current monitoring circuit 21 will be described.
And the current monitoring circuit 21 is also a subtractor 25 and a limiter circuit 2.
6 and a power control transfer function circuit 27. This place
Rectifier current IR The effective value of
The set value I set corresponding to this R REFWhen it is above,
[IR REF-IR ] Error signal is subtractor 25, limiter times
Output from the path 26 to the power control transfer function circuit 27. Electric
The force control transfer function circuit 27R REF-IR When ≦ 0
Only [IR REF-IR ], The power control signal k proportional to
Turn it and output it. Where the proportional coefficient K2 And set k = + K2(IR -IR REF). However, the proportional coefficient K2 The spilled inverter power
Is a positive constant for computing the magnitude of.
【００２３】そして、電力制御伝達関数回路２７の電力
制御信号ｋを補償電流指令値ＩC REFと乗算器３０で乗算
して振幅調整信号ｋＩC REFを求め、これを出力電流制御
信号ＶI と加算して、最終的な出力電圧指令信号ＶF REF
を得る。Then, the power control signal k of the power control transfer function circuit 27 is multiplied by the compensation current command value I C REF by the multiplier 30 to obtain the amplitude adjustment signal kI C REF , which is used as the output current control signal V I. The final output voltage command signal V F REF
Get.
【００２４】以上の電流監視回路２１の場合において
も、結果的にインバータ電力ＰF が上記式と同式で与
えられる。この場合、整流器電流ＩR が設定値ＩR REF以
上になったとき、電力制御信号ｋが正となって出力電圧
を減少させ、式の流出インバータ電力誤差成分［ＶE
ＩC ］をキャンセルして、流出インバータ電力誤差成分
を抑制し、整流器側の直流過電圧を回避する。Also in the case of the current monitoring circuit 21 described above, the inverter power P F is consequently given by the same equation as the above equation. In this case, when the rectifier current I R becomes equal to or greater than the set value I R REF , the power control signal k becomes positive to decrease the output voltage, and the outflow inverter power error component [V E
I C ] to cancel the outflow inverter power error component and avoid DC overvoltage on the rectifier side.
【００２５】[0025]
【発明の効果】本発明によれば、小容量ＰＷＭインバー
タの流出入インバータ電力が直流電圧と整流器電流の監
視信号に基づいて制御できるので、小容量ＰＷＭインバ
ータにおける流入インバータ電力による直流コンデンサ
の過充電や、流出インバータ電力による整流器過負荷の
防止が可能となり、動作特性の安定した高信頼度の自励
式無効電力補償装置が提供できる。According to the present invention, since the inflow / outflow inverter power of the small capacity PWM inverter can be controlled based on the monitoring signal of the DC voltage and the rectifier current, the DC capacitor is overcharged by the inflow inverter power in the small capacity PWM inverter. Further, it is possible to prevent the rectifier overload due to the outflow inverter power, and it is possible to provide a highly reliable self-excited reactive power compensator with stable operation characteristics.
【図１】本発明方法の実施装置例を示す小容量ＰＷＭイ
ンバータの制御ブロック図。FIG. 1 is a control block diagram of a small-capacity PWM inverter showing an example of an embodiment of a method of the present invention.
【図２】自励式無効電力補償装置のブロック図。FIG. 2 is a block diagram of a self-excited reactive power compensator.
【図３】図２の自励式無効電力補償装置における小容量
ＰＷＭインバータの従来の制御ブロック図。FIG. 3 is a conventional control block diagram of a small capacity PWM inverter in the self-excited reactive power compensator of FIG. 2.
２ 系統母線 ３ 変動負荷 ４ 自励式無効電力補償装置 ５ 大容量矩形波インバータ ６ 小容量ＰＷＭインバータ ７ 大容量変圧器 ８ 小容量変圧器 2 System bus 3 Variable load 4 Self-excited reactive power compensator 5 Large capacity rectangular wave inverter 6 Small capacity PWM inverter 7 Large capacity transformer 8 Small capacity transformer
Claims (1)
同等の電圧を大容量変圧器を介して出力する大容量矩形
波インバータと、系統母線の負荷変動を抑制する補償電
圧を小容量変圧器を介して出力する小容量ＰＷＭインバ
ータとを、直列接続した自励式無効電力補償装置におけ
る小容量ＰＷＭインバータの制御方法であって、 小容量ＰＷＭインバータの直流電圧及び直流コンデンサ
を充電する整流器電流が夫々に予め設定された設定値以
上に変動したときの変動値に応じた電力制御信号と系統
母線の負荷変動に応じた補償電流指令信号を乗じた振幅
調整信号を、前記補償電流指令信号と補償電流を減算し
てその差が小さくなるようにフィードバック制御して得
た出力電流制御信号に加算し、この加算して得られた電
圧信号を出力電圧指令信号として小容量ＰＷＭインバー
タを制御することを特徴とする自励式無効電力補償装置
の制御方法。1. A large-capacity rectangular wave inverter that outputs a voltage equivalent to the bus voltage of a system bus having a fluctuating load through a large-capacity transformer, and a small-capacity transformer that provides a compensation voltage for suppressing load fluctuation of the system bus. A method for controlling a small-capacity PWM inverter in a self-excited var compensator in which a small-capacity PWM inverter that outputs the signal via a small-capacity PWM inverter is connected in series. An amplitude adjustment signal obtained by multiplying the power control signal according to the fluctuation value when it fluctuates more than the preset value and the compensation current command signal according to the load fluctuation of the system bus, the compensation current command signal and the compensation current. Is added to the output current control signal obtained by feedback control so that the difference becomes smaller, and the voltage signal obtained by this addition is added to the output voltage command signal. The method of self-excited reactive power compensation apparatus characterized by controlling the small-capacity PWM inverter as.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7213500A JPH0965574A (en) | 1995-08-22 | 1995-08-22 | Control of self-excited reactive power compensating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7213500A JPH0965574A (en) | 1995-08-22 | 1995-08-22 | Control of self-excited reactive power compensating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0965574A true JPH0965574A (en) | 1997-03-07 |
Family
ID=16640231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7213500A Withdrawn JPH0965574A (en) | 1995-08-22 | 1995-08-22 | Control of self-excited reactive power compensating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0965574A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008048536A (en) * | 2006-08-16 | 2008-02-28 | Mitsubishi Electric Corp | Reactive power compensating device |
| JP2008199830A (en) * | 2007-02-15 | 2008-08-28 | Mitsubishi Electric Corp | Power conversion device |
| JP2012139083A (en) * | 2010-12-28 | 2012-07-19 | Nichicon Corp | Power supply device |
| CN104836429A (en) * | 2014-02-11 | 2015-08-12 | 华北电力大学 | Start-up inrush current inhibiting control strategy of three-phase grid-connected inverter |
| JP2019140898A (en) * | 2018-02-13 | 2019-08-22 | 富士電機株式会社 | Reactive power compensation device and control program thereof, and reactive power compensation system |
-
1995
- 1995-08-22 JP JP7213500A patent/JPH0965574A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008048536A (en) * | 2006-08-16 | 2008-02-28 | Mitsubishi Electric Corp | Reactive power compensating device |
| JP2008199830A (en) * | 2007-02-15 | 2008-08-28 | Mitsubishi Electric Corp | Power conversion device |
| JP2012139083A (en) * | 2010-12-28 | 2012-07-19 | Nichicon Corp | Power supply device |
| CN104836429A (en) * | 2014-02-11 | 2015-08-12 | 华北电力大学 | Start-up inrush current inhibiting control strategy of three-phase grid-connected inverter |
| JP2019140898A (en) * | 2018-02-13 | 2019-08-22 | 富士電機株式会社 | Reactive power compensation device and control program thereof, and reactive power compensation system |
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