JP5760860B2 - Reactive power compensator - Google Patents

Reactive power compensator Download PDF

Info

Publication number
JP5760860B2
JP5760860B2 JP2011186729A JP2011186729A JP5760860B2 JP 5760860 B2 JP5760860 B2 JP 5760860B2 JP 2011186729 A JP2011186729 A JP 2011186729A JP 2011186729 A JP2011186729 A JP 2011186729A JP 5760860 B2 JP5760860 B2 JP 5760860B2
Authority
JP
Japan
Prior art keywords
command value
reactive power
voltage
voltage command
value
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.)
Active
Application number
JP2011186729A
Other languages
Japanese (ja)
Other versions
JP2013051743A (en
Inventor
材津　寛
寛 材津
奨 山士家
奨 山士家
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meidensha Corp
Original Assignee
Meidensha Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Meidensha Corp filed Critical Meidensha Corp
Priority to JP2011186729A priority Critical patent/JP5760860B2/en
Publication of JP2013051743A publication Critical patent/JP2013051743A/en
Application granted granted Critical
Publication of JP5760860B2 publication Critical patent/JP5760860B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • Y02E40/10—Flexible AC transmission systems [FACTS]
    • 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)

Description

本発明は、電力系統の電圧変動を無効電力補償で抑制する静止型無効電力補償装置に係り、特に無効電力制御装置（交直変換装置）を複数台並列に設け、この無効電力制御装置の運転台数を変更して必要な無効電力補償量を得る無効電力補償装置に関する。   The present invention relates to a static reactive power compensator that suppresses voltage fluctuations of a power system by reactive power compensation, and in particular, a plurality of reactive power control devices (AC / DC converters) are provided in parallel, and the number of operating reactive power control devices is The present invention relates to a reactive power compensator that obtains a necessary reactive power compensation amount by changing.

静止型無効電力補償装置（ＳＶＣ：Ｓｔａｔｉｃ Ｖａｒ Ｃｏｍｐｅｎｓａｔｏｒ）のブロック構成例を図５に示す。同図は、無効電力制御装置としての２台の交直変換装置（ＩＮＶ）を負荷と並列に接続した場合の構成例であり、負荷の状態に合わせて、交直変換装置の運転台数を変更することで、ＳＶＣの運転効率を高めることができる。   FIG. 5 shows an example of a block configuration of a static reactive power compensator (SVC). This figure is a configuration example when two AC / DC converters (INV) as reactive power control apparatuses are connected in parallel with a load, and the number of operating AC / DC converters is changed in accordance with the state of the load. Thus, the operating efficiency of the SVC can be increased.

図５において、ＳＶＣ（静止型無効電力補償装置）１００は、電力系統に対し、モータなどの負荷２００と並列に接続され、絶縁と降圧を目的とした連系変圧器１１０と、交直変換装置のスイッチング動作により発生する高調波を抑制する２台のＬＣフィルタ１２０と、２台の交直変換装置（ＩＮＶ）１３０と、ＳＶＣ制御装置１４０から構成される。   In FIG. 5, an SVC (Static Reactive Power Compensator) 100 is connected to a power system in parallel with a load 200 such as a motor, and is connected to an interconnection transformer 110 for insulation and step-down, and an AC / DC converter. It includes two LC filters 120 that suppress harmonics generated by the switching operation, two AC / DC converters (INV) 130, and an SVC controller 140.

ＳＶＣ制御装置１４０は、系統電圧Ｖｓと、インバータ電流Ｉｉｎｖと、直流電圧Ｖｄｃの各検出器（図示省略）を備え、検出した系統電圧Ｖｓと基準系統電圧との差（電圧変動）を抑制するために必要な無効電力指令値Ｑ＿ｒｅｆを演算する無効電力指令値演算部１４１と、この無効電力指令値Ｑ＿ｒｅｆと上記のインバータ電流Ｉｉｎｖと直流電圧Ｖｄｃの各検出値から２台の交直変換装置１３０に無効電力補償出力および直流電圧Ｖｄｃの変化を基にした有効電力補償出力が得られるよう、交直変換装置１３０ゲート信号ＩＮＶ１，ＩＮＶ２を生成するＩＮＶ制御装置１４２，１４３から構成される。   The SVC control device 140 includes detectors (not shown) of the system voltage Vs, the inverter current Iinv, and the DC voltage Vdc, and suppresses a difference (voltage fluctuation) between the detected system voltage Vs and the reference system voltage. The reactive power command value calculation unit 141 for calculating the reactive power command value Q_ref necessary for the power supply, and the reactive power command value Q_ref, the inverter current Iinv, and the detected values of the DC voltage Vdc are invalidated to the two AC / DC converters 130 The AC / DC converter 130 includes INV controllers 142 and 143 that generate the gate signals INV1 and INV2 so that an active power compensation output based on the power compensation output and the change in the DC voltage Vdc can be obtained.

無効電力指令値演算部１４１は、図６に具体例を示すように、実効値演算器１では系統電圧検出値Ｖｓをその実効値Ｖｓ＿ｒｍｓとして求める。電圧変動補償制御器２では実効値の系統電圧指令値Ｖｓ＿ｒｍｓ＿ｒｅｆと実効値演算器１で求める実効値の系統電圧Ｖｓ＿ｒｍｓの偏差に応じて電圧変動補償演算（例えばＰＩ演算など）することで、系統電圧Ｖｓ＿ｒｍｓを系統電圧指令値Ｖｓ＿ｒｍｓ＿ｒｅｆ通りにするための無効電力量を演算し、この演算結果は無効電力指令値Ｑ＿ｒｅｆとしてＩＮＶ制御装置１４２，１４３に出力する。   As shown in a specific example in FIG. 6, the reactive power command value calculation unit 141 obtains the system voltage detection value Vs as its effective value Vs_rms in the effective value calculator 1. The voltage fluctuation compensation controller 2 performs voltage fluctuation compensation calculation (for example, PI calculation) according to the deviation between the effective system voltage command value Vs_rms_ref and the effective value system voltage Vs_rms obtained by the effective value calculator 1. The reactive power amount for making Vs_rms equal to the system voltage command value Vs_rms_ref is calculated, and the calculation result is output to the INV control devices 142 and 143 as the reactive power command value Q_ref.

ＩＮＶ制御装置１４２，１４３は、図６に具体例を示すように、系統電圧検出値ＶｓからＰＬＬ（位相同期）回路３とＣＯＳ関数演算器４とＳＩＮ関数演算器５によって系統電圧と同期したＣＯＳ波成分とＳＩＮ波成分を計算する。直流電圧制御器（ＤＣＡＶＲ）６では直流電圧指令値Ｖｄｃ＿ｒｅｆとその検出値ＶｄｃのＰＩ演算で交直変換装置（ＩＮＶ）の直流電圧補償値を求め、この直流電圧補償値にＳＩＮ波成分を掛けあわせることで、ＩＮＶの有効電流指令値を求める。   As shown in a specific example in FIG. 6, the INV controllers 142 and 143 are configured to detect the COS synchronized with the system voltage from the system voltage detection value Vs by the PLL (phase synchronization) circuit 3, the COS function calculator 4, and the SIN function calculator 5. Wave component and SIN wave component are calculated. The DC voltage controller (DCAVR) 6 calculates the DC voltage compensation value of the AC / DC converter (INV) by the PI calculation of the DC voltage command value Vdc_ref and the detected value Vdc, and multiplies the DC voltage compensation value by the SIN wave component. Thus, the effective current command value of INV is obtained.

ＩＮＶに発生させる無効電力は、ＣＯＳ波成分と無効電力指令値Ｑ＿ｒｅｆをかけあわせることで無効電流指令値を求める。この無効電流指令値と有効電流指令値とを足し合わせたものをＩＮＶ電流指令値とし、このＩＮＶ電流指令値とＩＮＶ電流検出値Ｉｉｎｖとの偏差を電流制御器（ＡＣＲ）７でＰＩ演算することで、ＩＮＶの電圧指令値を求め、これを基にしてＰＷＭ回路８でＰＷＭ波形のＩＮＶゲート信号を生成する。   The reactive power generated in the INV is obtained by multiplying the COS wave component and the reactive power command value Q_ref, thereby obtaining a reactive current command value. The sum of the reactive current command value and the active current command value is used as the INV current command value, and the current controller (ACR) 7 performs PI calculation on the deviation between the INV current command value and the INV current detection value Iinv. Thus, the INV voltage command value is obtained, and based on this, the PWM circuit 8 generates an INV gate signal having a PWM waveform.

以上のような構成により、ＳＶＣは、モータ負荷などの始動電流によって系統電圧が変動した時、系統電圧変動を電圧または実効値で検出して系統電圧変動を抑制するための無効電力量を演算し、これを指令値として交直変換装置や無効電力制御装置に制御した無効電力量を発生させ、系統電圧の変動を抑制する（例えば、特許文献１，２参照）。   With the above configuration, when the system voltage fluctuates due to a starting current such as a motor load, the SVC calculates a reactive energy for detecting the system voltage fluctuation with a voltage or an effective value and suppressing the system voltage fluctuation. Then, the reactive power amount controlled by the AC / DC converter or the reactive power control device is generated using this as a command value, and fluctuations in the system voltage are suppressed (for example, see Patent Documents 1 and 2).

特開２００８−４０７３３JP2008-40733 特開２００８−１０４２５８JP2008-104258

（１）従来の技術では、制御装置の電圧変動補償部２の電圧指令値を固定としている。例えば、電力系統の公称電圧が６．６ｋＶであれば、電圧指令値は６．６ｋＶに固定している。   (1) In the conventional technique, the voltage command value of the voltage fluctuation compensator 2 of the control device is fixed. For example, if the nominal voltage of the power system is 6.6 kV, the voltage command value is fixed at 6.6 kV.

そうした場合、系統電圧検出値と電圧指令値が少しでも異なる時、ＳＶＣは系統電圧実効値と電圧指令値を一致させるために無効電力を発生させる。この無効電力の発生がＳＶＣの定格容量に近い状態にあって、急激な電圧変動が発生すると、ＳＶＣはさらに無効電力を発生させる必要があるが、すでに定格容量に近い無効電力を出力しているため、電圧変動を抑えるために必要な無効電力を発生できず（容量不足）、電圧変動を抑制できない場合がある。   In such a case, when the system voltage detection value and the voltage command value are slightly different, the SVC generates reactive power to match the system voltage effective value and the voltage command value. If the generation of reactive power is close to the rated capacity of the SVC and a sudden voltage fluctuation occurs, the SVC needs to generate additional reactive power, but already outputs reactive power close to the rated capacity. For this reason, reactive power necessary for suppressing voltage fluctuation cannot be generated (capacity shortage), and voltage fluctuation may not be suppressed.

この点について、特許文献１は、制御対象電圧変動に対応した無効電力容量を確保するため、制御対象電圧の変動に一定の時間遅れ特性で追従させた比較電圧を生成し、両者の差を制御対象電圧の変動分として検出し、この変動分で無効電力を制御することを提案している。この無効電力制御では、電圧変動に対して無効電力補償量を制限することで補償容量不足を回避しようとするが、無効電力補償で電圧変動が０になった後にも無効電力補償量が０に戻されることがないため、そのときの補償量によっては次回の電圧変動発生時に補償容量不足を起こすことが想定される。   In this regard, Patent Document 1 generates a comparison voltage that follows the fluctuation of the control target voltage with a certain time delay characteristic in order to secure a reactive power capacity corresponding to the control target voltage fluctuation, and controls the difference between the two. It has been proposed to detect the fluctuation of the target voltage and control the reactive power with this fluctuation. In this reactive power control, an attempt is made to avoid a shortage of compensation capacity by limiting the reactive power compensation amount with respect to the voltage fluctuation. However, the reactive power compensation quantity is reduced to 0 even after the voltage fluctuation becomes 0 by the reactive power compensation. Since it is not returned, depending on the compensation amount at that time, it is assumed that the compensation capacity is insufficient when the next voltage fluctuation occurs.

また、特許文献２は、電圧検出値を一定時間遅延させたものとの差分が一定レベルに達したときに無効電力指令値を補正することで高速、低速の電圧変動にも対応できるようにしているが、特許文献１と同様に、定常時に無効電力補償が行なわれている場合には電圧変動発生時に補償容量不足を起こすことが想定される。   Japanese Patent Laid-Open No. 2004-26883 is adapted to cope with high-speed and low-speed voltage fluctuations by correcting the reactive power command value when the difference from the voltage detection value delayed by a certain time reaches a certain level. However, as in Patent Document 1, when reactive power compensation is performed in a steady state, it is assumed that the compensation capacity is insufficient when voltage fluctuation occurs.

（２）負荷の軽重状態に合わせて、ＩＮＶ（無効電力制御装置）の運転台数を変更することで必要な無効電力補償量を得る無効電力補償装置の場合、この構成に従来の無効電力補償技術を適用するとしても、制御装置はＩＮＶ運転台数の変更にも電圧変動補償の制御パラメータは固定されたままになる。   (2) In the case of a reactive power compensator that obtains a necessary reactive power compensation amount by changing the number of INVs (reactive power control devices) that are operated in accordance with the light load state, this configuration has a conventional reactive power compensation technique. Even when the control device is applied, the control parameter of the voltage fluctuation compensation remains fixed even when the number of INV operation units is changed.

この制御パラメータの固定では、ＩＮＶの運転台数が異なると電圧変動補償の応答性が異なるため（運転台数が多いと応答が速くなり、運転台数が少なくなると応答が遅くなる）、ＳＶＣの運転台数によって電圧変動補償の応答性に過不足を起こす問題がある。   When this control parameter is fixed, the response of voltage fluctuation compensation is different when the number of INV operated is different (the response is faster when the number of operating is large, and the response is slow when the number of operating is small). There is a problem that the response of voltage fluctuation compensation is excessive or insufficient.

本発明の目的は、無効電力補償の容量不足を起こすことなく、しかも無効電力制御装置の運転台数の変更にも同等の応答性を持たせることができる無効電力補償装置を提供することにある。   An object of the present invention is to provide a reactive power compensator that does not cause a capacity shortage of the reactive power compensation and that can have equivalent responsiveness to changes in the number of operating reactive power control devices.

本発明は、前記の課題を解決するため、定常時は系統電圧に一致した電圧指令値を出力することで系統電圧との偏差を０にして無効電力補償量を０に制御しておき、系統電圧が変動したときに電圧指令値の出力を単位時間当たり所定の増減量を有して系統電圧に追従変化させることで系統電圧との偏差に応じた無効電力補償量に制御し、最終的には系統電圧検出値に一致した電圧指令値に収束させるもので、以下の構成を特徴とする。   In order to solve the above-described problem, the present invention outputs a voltage command value that matches the system voltage in a steady state so that the deviation from the system voltage is 0 and the reactive power compensation amount is controlled to 0. When the voltage fluctuates, the output of the voltage command value has a predetermined increase / decrease amount per unit time, and changes to follow the system voltage to control the reactive power compensation amount according to the deviation from the system voltage, and finally Is to converge to a voltage command value that matches the system voltage detection value, and is characterized by the following configuration.

電力系統に対し、無効電力量を制御できる無効電力制御装置を負荷と並列接続し、無効電力指令値演算部は、系統電圧検出値と系統電圧指令値との偏差に応じて電圧変動補償部で演算し、前記無効電力制御装置の無効電力指令値（Ｑ＿ｒｅｆ）を求める無効電力補償装置において、
前記系統電圧指令値を設定する電圧指令値演算部は、定常時は系統電圧検出値に一致した電圧指令値を出力し、系統電圧が変動したときに単位時間当たり所定の増減量を有して系統電圧に追従変化する電圧指令値（Ｖｓ＿ｒｍｓ＿ｒｅｆ）を出力し、最終的には系統電圧検出値に一致した電圧指令値に収束させる演算手段を備えると共に、
前記電圧指令値演算部は、
前記無効電力指令値（Ｑ＿ｒｅｆ）の正負極性を判定する符号判定器と、
前記符号判定器の正負判定出力に単位時間当たりの所定の増減量を掛け合わせて電圧指令値の正負増減分（±ΔＶ＿ｒｍｓ）を演算周期毎に求める乗算器と、
演算周期１周期前（Ｚ−１）の前記電圧指令値の出力を保持する保持回路と、
前記乗算器で求める正負増減分を前記保持回路に保持する電圧指令値に足し合わせて現在の電圧指令値として記憶更新しておき、無効電力補償を開始したときには現在の系統電圧検出値に初期化するリセット機能付レジスタと、
前記レジスタで記憶更新した電圧指令値を一定範囲に制限して前記電圧指令値（Ｖｓ＿ｒｍｓ＿ｒｅｆ）として出力するリミッタと、
を備えたことを特徴とする。 A reactive power control device capable of controlling the reactive power amount is connected in parallel to the load for the power system, and the reactive power command value calculation unit is a voltage fluctuation compensation unit according to the deviation between the system voltage detection value and the system voltage command value. In the reactive power compensator that calculates and obtains the reactive power command value (Q_ref) of the reactive power control device,
The voltage command value calculation unit for setting the system voltage command value outputs a voltage command value that matches the system voltage detection value in a steady state, and has a predetermined increase / decrease amount per unit time when the system voltage fluctuates. A voltage command value (Vs_rms_ref) that changes following the system voltage is output, and finally includes calculation means for converging to a voltage command value that matches the system voltage detection value.
The voltage command value calculator is
A sign determiner for determining positive and negative polarity of the reactive power command value (Q_ref);
A multiplier for multiplying a positive / negative determination output of the sign determination unit by a predetermined increase / decrease amount per unit time to obtain a positive / negative increase / decrease (± ΔV_rms) of the voltage command value for each calculation cycle;
A holding circuit for holding the output of the voltage command value one cycle before the calculation cycle (Z-1);
The positive / negative increase / decrease obtained by the multiplier is added to the voltage command value held in the holding circuit to be stored and updated as the current voltage command value, and initialized to the current system voltage detection value when reactive power compensation is started. Register with reset function to
A limiter that limits the voltage command value stored and updated in the register to a certain range and outputs the voltage command value (Vs_rms_ref);
It is provided with.

前記無効電力制御装置を複数台並列に設けると共に、前記電圧指令値演算部の出力側に台数制御部を設け、
前記台数制御部は、前記電圧変動補償部の演算値を入力して前記無効電力制御装置の運転台数（Ｂ）に比例したリミッタ値に制限する可変リミッタと、
前記可変リミッタの出力（Ａ）を前記運転台数（Ｂ）で除算して前記無効電力指令値（Ｑ＿ｒｅｆ）とする除算器とを備えたことを特徴とする。 A plurality of reactive power control devices are provided in parallel, and a number control unit is provided on the output side of the voltage command value calculation unit,
The number control unit inputs a calculated value of the voltage fluctuation compensation unit and limits a limiter value proportional to the number of operating reactive power control devices (B), and a variable limiter,
Characterized in that a divider to an output of the variable limiter said reactive power command value is divided by (A) the number of operating (B) (Q_ref).

以上のとおり、本発明によれば、系統電圧指令値を設定する電圧指令値演算部は、定常時は系統電圧に一致した電圧指令値を出力することで系統電圧との偏差を０にして無効電力補償量を０に制御しておき、系統電圧が変動したときに電圧指令値の出力を単位時間当たり所定の増減量を有して系統電圧に追従変化させることで系統電圧との偏差に応じた無効電力補償量に制御し、最終的には系統電圧検出値に一致した電圧指令値に収束させるため、急激な電圧変動が発生した場合にも電圧変動を抑制するために必要な無効電力を容量不足を起こすことなく発生して電圧変動を抑制することができる。   As described above, according to the present invention, the voltage command value calculation unit for setting the system voltage command value outputs a voltage command value that matches the system voltage in a steady state, thereby invalidating the deviation from the system voltage to zero. The power compensation amount is controlled to 0, and when the system voltage fluctuates, the output of the voltage command value has a predetermined increase / decrease amount per unit time, and changes according to the system voltage according to the deviation from the system voltage. In order to control the reactive power compensation amount and finally converge to the voltage command value that matches the system voltage detection value, the reactive power required to suppress the voltage fluctuation even when a sudden voltage fluctuation occurs It can occur without causing a shortage of capacity and suppress voltage fluctuations.

また、無効電力制御装置が運転を開始したとき、電圧変動補償の指令値と検出値（系統電圧実効値）が同じになるため、無効電力を急激に発生させることがない。   Further, when the reactive power control device starts operation, the command value for voltage fluctuation compensation and the detected value (system voltage effective value) are the same, so that reactive power is not generated abruptly.

また、無効電力指令値演算部は、電圧変動補償演算の出力を無効電力制御装置の運転台数（Ｂ）に比例したリミッタ値に制限し、この出力（Ａ）を運転台数（Ｂ）で除算して無効電力指令値（Ｑ＿ｒｅｆ）とする台数制御部を備えたため、無効電力制御装置の運転台数が変更された場合にも電圧変動補償の制御パラメータを再調整することなく、同等の応答性を持たせることができる。   The reactive power command value calculation unit limits the output of the voltage fluctuation compensation calculation to a limiter value proportional to the number of operating reactive power control devices (B), and divides this output (A) by the operating number (B). Because it has a unit control unit that makes the reactive power command value (Q_ref), even if the number of operating reactive power control devices is changed, it has the same responsiveness without readjusting the control parameter for voltage fluctuation compensation Can be made.

本発明の実施形態を示す静止型無効電力補償装置（ＳＶＣ）の制御装置。The control apparatus of the static reactive power compensation apparatus (SVC) which shows embodiment of this invention. 従来の無効電力補償制御例。Conventional reactive power compensation control example. 実施形態による無効電力補償制御例。The reactive power compensation control example by embodiment. 実施形態による無効電力発生量の応答例。The example of a response of the reactive power generation amount by embodiment. 静止型無効電力補償装置（ＳＶＣ）の構成例。The structural example of a static reactive power compensation apparatus (SVC). 従来の静止型無効電力補償装置（ＳＶＣ）の制御装置。A control device for a conventional static reactive power compensator (SVC).

図１は本発明の実施形態を示す静止型無効電力補償装置（ＳＶＣ）の制御装置であり、図６と異なる部分は無効電力指令値演算部１４１に電圧指令値演算部１０と台数制御部２０を追加した点にある。以下、これらの構成と演算・制御動作の詳細を説明する。   FIG. 1 is a controller for a static reactive power compensator (SVC) showing an embodiment of the present invention. The difference from FIG. 6 is that a reactive power command value calculator 141 is replaced with a voltage command value calculator 10 and a number controller 20. It is in the point that was added. Hereinafter, the details of these configurations and calculation / control operations will be described.

（１）電圧指令値演算部
電圧指令値演算部１０は、定常時は系統電圧に一致した電圧指令値を出力することで系統電圧との偏差を０にして無効電力補償量も０に制御しておき、系統電圧が変動したときに電圧指令値の出力を単位時間当たり所定の増減量を有して系統電圧に追従変化させることで系統電圧との偏差に応じた無効電力補償量に制御し、無効電力補償によって最終的には電圧指令値を系統電圧に収束させて無効電力補償量を０に制御するもので、その構成を図１中に示す。 (1) Voltage command value calculation unit The voltage command value calculation unit 10 outputs a voltage command value that matches the system voltage in a steady state, thereby setting the deviation from the system voltage to 0 and controlling the reactive power compensation amount to 0. In addition, when the system voltage fluctuates, the output of the voltage command value has a predetermined increase / decrease amount per unit time, and is changed to follow the system voltage to control the reactive power compensation amount according to the deviation from the system voltage. The reactive power compensation finally converges the voltage command value to the system voltage and controls the reactive power compensation amount to 0, and the configuration is shown in FIG.

電圧指令値演算部１０は、無効電力指令値演算部１４１の出力になる無効電力指令値Ｑ＿ｒｅｆの正負極性を符号判定器１１で判定し、この判定が正であれば＋１、負であれば−１を出力する。符号判定器１１の判定出力は乗算器にてステップ電圧を掛け合わせることで電圧指令値の正負増減分（±ΔＶ＿ｒｍｓ）を求め、この正負増減分を保持回路１２に保持する演算周期１周期前（Ｚ-1）の電圧指令値出力（実効値）に足し合わせ、この結果をリセット機能付レジスタ１３に現在の電圧指令値（実効値）としてセットし、この現在値をリミッタ１４で一定範囲に制限して実効値の電圧指令値Ｖｓ＿ｒｍｓ＿ｒｅｆとして出力する。 The voltage command value calculation unit 10 determines the positive / negative polarity of the reactive power command value Q_ref that is output from the reactive power command value calculation unit 141 by the sign determination unit 11. If this determination is positive, it is +1, and if it is negative, − 1 is output. The determination output of the sign determination unit 11 is obtained by multiplying a step voltage by a multiplier to obtain a positive / negative increase / decrease (± ΔV_rms) of the voltage command value, and the calculation cycle one cycle before holding the positive / negative increase / decrease in the holding circuit 12 ( Z -1 ) is added to the voltage command value output (effective value), the result is set as the current voltage command value (effective value) in the register 13 with the reset function, and the current value is limited to a certain range by the limiter 14. And output as an effective voltage command value Vs_rms_ref.

なお、上記のステップ電圧は、電圧指令演算周期の１周期（単位時間当たり）で所定の増減量で電圧指令値を増減させる単位電圧（ΔＶ＿ｒｍｓ）として設定する。例えば、ステップ電圧は、電圧指令値演算時間１分間で電圧指令値を１％程度変化させる値に設定するもので、負荷としてのモータの始動電流期間（１０秒程度）などによる系統電圧の急峻な変動に対して十分に小さい増減量を設定する。上記のステップ電圧の具体的な設定例としては、電圧指令値の演算周期を１０ｍｓとすると、１分（６０００回演算）で電圧変動補償の指令値が１００から１０１に変化するような値に設定するので、（１０１−１００）／６０００＝１６６．７×１０-6という値を単位電圧（ΔＶ＿ｒｍｓ）として設定する。 The step voltage is set as a unit voltage (ΔV_rms) that increases or decreases the voltage command value by a predetermined increase / decrease amount in one cycle (per unit time) of the voltage command calculation cycle. For example, the step voltage is set to a value that changes the voltage command value by about 1% in a voltage command value calculation time of 1 minute, and the system voltage is steep due to the starting current period (about 10 seconds) of the motor as a load. Set an increase / decrease amount that is sufficiently small against fluctuations. As a specific setting example of the above step voltage, when the calculation cycle of the voltage command value is 10 ms, the voltage fluctuation compensation command value is set to a value that changes from 100 to 101 in 1 minute (6000 times calculation). Therefore, a value of (101−100) /6000=166.7×10 −6 is set as the unit voltage (ΔV_rms).

リセット機能付レジスタ１３は、定常時には電圧指令値を記憶更新しておき、ＳＶＣが停止状態から運転を開始したとき（無効電力補償を開始したとき）にはそのリセットによって現在の系統電圧検出値（実効値）に初期化する。これにより、電圧指令値（実効値）の初期値は、電圧変動が発生していない定常時や安定時には系統電圧検出値（実効値）に一致させ、その偏差を０にして電圧変動補償量を０に制御し、無効電力補償量も０に保持する。   The register 13 with a reset function stores and updates the voltage command value in a steady state, and when the SVC starts operation from a stopped state (when reactive power compensation is started), the reset causes the current system voltage detection value ( (Effective value). As a result, the initial value of the voltage command value (effective value) is made to coincide with the system voltage detection value (effective value) at the steady or stable time when no voltage fluctuation occurs, the deviation is set to 0, and the voltage fluctuation compensation amount is set. The reactive power compensation amount is also kept at 0.

したがって、電圧指令値演算部１０は、無効電力指令値Ｑ＿ｒｅｆが正極性（＋）であれば、電圧変動補償の指令値（Ｖｓ＿ｒｍｓ＿ｒｅｆ）をステップ電圧分で少しずつ大きくし、無効電力指令値Ｑ＿ｒｅｆが０になるまで電圧変動補償の指令値を大きくする。逆に、無効電力指令値Ｑ＿ｒｅｆが負極性（−）であれば、電圧変動補償の指令値をステップ電圧分で少しずつ小さくし、無効電力指令値Ｑ＿ｒｅｆが０になるまで電圧変動補償の指令値を小さくする。   Therefore, if the reactive power command value Q_ref is positive (+), the voltage command value calculation unit 10 gradually increases the voltage fluctuation compensation command value (Vs_rms_ref) by the step voltage, and the reactive power command value Q_ref is Increase the command value for voltage fluctuation compensation until zero. On the contrary, if the reactive power command value Q_ref is negative (−), the voltage fluctuation compensation command value is gradually reduced by the step voltage, and the voltage fluctuation compensation command value is reduced until the reactive power command value Q_ref becomes zero. Make it smaller.

このように、電圧指令値演算部１０の電圧指令値出力は、定常時は実効値演算部１からの電圧検出値（実効値）との偏差を０にしておき、電圧変動補償制御器２により求める無効電力指令値を０近くにしておく。そして、負荷となるモータの始動時など、電圧検出値が変動した場合には単位時間当たり一定の増減量を有して系統電圧に追従できる電圧指令値を出力することでの電圧指令値との偏差に応じた無効電力補償量に制御する。   As described above, the voltage command value output from the voltage command value calculation unit 10 is set so that the deviation from the voltage detection value (effective value) from the effective value calculation unit 1 is set to 0 in the steady state. The reactive power command value to be obtained is kept close to zero. When the voltage detection value fluctuates, such as when the motor that is the load is started, the voltage command value is output by outputting a voltage command value that can follow the system voltage with a constant increase / decrease amount per unit time. The reactive power compensation amount is controlled according to the deviation.

図２は図６の構成による従来の無効電力補償制御例を示し、図３は図１の電圧指令値演算部１０による無効電力補償制御例を示す。図２に示す従来例では、系統電圧指令値Ｖｓ＿ｒｍｓ＿ｒｅｆが固定の場合、つまり図１の電圧指令値演算部１０の出力が固定の場合、系統電圧実効値指令値と系統電圧検出値Ｖｓ＿ｒｍｓに差があるため、指令値Ｑ＿ｒｅｆが０にならず、定常的に無効電力を発生している。この無効電力量がすでに定格容量に近い状態で系統電圧が急変すると（時刻ｔ１）、指令値と検出値の差によって無効電力指令値Ｑ＿ｒｅｆが急速に上昇するが、無効電力発生量としては電圧急変前の値から装置定格で制限された最大値（リミッタ値）に制限され、系統電圧を充分に補償できる無効電力量を発生できず（容量不足）、電圧変動を抑制できないことになる。   2 shows an example of conventional reactive power compensation control with the configuration of FIG. 6, and FIG. 3 shows an example of reactive power compensation control by the voltage command value calculation unit 10 of FIG. In the conventional example shown in FIG. 2, when the system voltage command value Vs_rms_ref is fixed, that is, when the output of the voltage command value calculation unit 10 in FIG. 1 is fixed, there is a difference between the system voltage effective value command value and the system voltage detected value Vs_rms. Therefore, the command value Q_ref does not become 0, and reactive power is constantly generated. When the system voltage suddenly changes when the reactive power amount is already close to the rated capacity (time t1), the reactive power command value Q_ref rises rapidly due to the difference between the command value and the detected value. It is limited to the maximum value (limiter value) limited by the device rating from the previous value, cannot generate reactive power that can sufficiently compensate the system voltage (insufficient capacity), and cannot suppress voltage fluctuation.

この従来例に対し、本実施形態になる、図３に示す電圧指令値演算部１０による無効電力補償制御では、定常的には、電圧指令値Ｖｓ＿ｒｍｓ＿ｒｅｆは系統電圧検出値Ｖｓ＿ｒｍｓに一致するよう制御され、無効電力発生量も０に制御されている。そして、系統電圧が急変（図示では低下）すると（時刻ｔ１）、指令値と検出値の偏差によって無効電力発生量を０から急峻に増加させる。このときの無効電力補償は直前の補償量が０にあるため、装置定格に制限されることなく充分な補償量を得ることができ、しかも電圧変動指令値は無効電力発生に伴って一定の増減量で系統電圧に向かって追従変化させ、これによって無効電力発生量も徐々に低下する。その後、系統電圧が基の値に復帰した場合（時刻ｔ２）、電圧変動指令値と検出値の差が正負逆転し、無効電力発生量はマイナスに反転し、この状態から０に向かって上昇制御される（時刻ｔ３）。   In contrast to this conventional example, in the reactive power compensation control by the voltage command value calculation unit 10 shown in FIG. 3 according to the present embodiment, the voltage command value Vs_rms_ref is controlled to be consistent with the system voltage detection value Vs_rms. The reactive power generation amount is also controlled to zero. When the system voltage changes abruptly (decreases in the drawing) (time t1), the reactive power generation amount is sharply increased from 0 by the deviation between the command value and the detected value. The reactive power compensation at this time is zero immediately before the compensation amount, so that a sufficient compensation amount can be obtained without being restricted by the device rating, and the voltage fluctuation command value is increased or decreased by a certain amount as the reactive power is generated. The amount of reactive power generated is gradually reduced toward the system voltage, thereby gradually reducing the amount of reactive power generated. After that, when the system voltage returns to the original value (time t2), the difference between the voltage fluctuation command value and the detected value is reversed positively and negatively, and the reactive power generation amount is reversed negatively. (Time t3).

上記のように、電圧指令値演算部１０は、系統電圧が変動したときに、電圧変動補償の指令値の出力を単位時間当たり所定の増減量を有して系統電圧に追従変化させることで無効電力補償を行い、最終的には無効電力補償量を０に制御しておく。ただし、リミッタ１４で電圧変動補償の指令値を一定範囲に制限し、例えば定格電圧の±１０％でリミッタをかけることで、系統電圧が異常な値にならないようにする。   As described above, the voltage command value calculation unit 10 is ineffective by changing the command value output of the voltage fluctuation compensation by following the system voltage with a predetermined increase / decrease amount per unit time when the system voltage fluctuates. Power compensation is performed, and finally the reactive power compensation amount is controlled to zero. However, the voltage fluctuation compensation command value is limited to a certain range by the limiter 14, and the limiter is applied at ± 10% of the rated voltage, for example, so that the system voltage does not become an abnormal value.

すなわち、電圧指令値演算部１０は、系統電圧の変動に対して、一定の無効電力を供給しないと元の電圧を維持できない場合、電圧変動補償の指令値を少しずつ変化させて無効電力補償量を小さくしていくが、電圧変動補償のリミッタにかかったらそれ以上電圧変動補償の指令値を変化させない。その時、無効電力はある程度発生している状態になる。また、元の系統電圧が維持されなくなるが、許容される電圧範囲内になるようにＳＶＣが動作することになる。   That is, the voltage command value calculation unit 10 changes the command value for voltage fluctuation compensation little by little to change the reactive power compensation amount when the original voltage cannot be maintained unless constant reactive power is supplied with respect to fluctuations in the system voltage. However, if the voltage fluctuation compensation limiter is applied, the command value for voltage fluctuation compensation is not changed any further. At that time, reactive power is generated to some extent. Further, the original system voltage is not maintained, but the SVC operates so as to be within an allowable voltage range.

また、電圧指令値演算部１０は、リセット機能付レジスタ１３によって、電圧変動補償指令値を系統電圧（Ｖｓ＿ｒｍｓ）の現在値で初期化（リセット）することで、ＳＶＣ運転時の電圧変動補償の指令値と系統電圧実効値の偏差がほぼ０になり、ＳＶＣ起動時の無効電力発生量を抑制することができる。   In addition, the voltage command value calculation unit 10 initializes (resets) the voltage fluctuation compensation command value with the current value of the system voltage (Vs_rms) by the register 13 with a reset function, so that the voltage fluctuation compensation command value during SVC operation is reset. The deviation between the value and the system voltage effective value becomes almost zero, and the amount of reactive power generated when the SVC is activated can be suppressed.

また、電圧変動補償の指令値の変化は、ステップ電圧によって、例えば１分で電圧変動補償の指令値を１％増減させる程度の値に設定する。これにより、非常にゆっくりした速度で電圧指令値が変化するため、モータ負荷などの始動電流によって系統電圧が急激に変化した時の補償に影響はない。   The change in the command value for voltage fluctuation compensation is set to a value that increases or decreases the command value for voltage fluctuation compensation by 1% in one minute, for example, by the step voltage. As a result, the voltage command value changes at a very slow speed, so that there is no effect on compensation when the system voltage changes suddenly due to a starting current such as a motor load.

（２）台数制御部
台数制御部２０は、交直変換装置（無効電力制御装置）の運転台数の変更に比例して無効電力補償指令値を調節することで、電圧変動補償の制御パラメータの変更を不要にして、電圧変動補償に安定した応答性を得るもので、そのブロック構成を図１中に示す。 (2) Number Control Unit The number control unit 20 changes the control parameter for voltage fluctuation compensation by adjusting the reactive power compensation command value in proportion to the change in the number of operating AC / DC converters (reactive power control devices). A block configuration is shown in FIG. 1, which eliminates the need and obtains stable response to voltage fluctuation compensation.

台数制御部２０は、電圧変動補償部２の出力を可変リミッタ２１で運転台数Ｂに応じたリミッタ値に制限し、このリミッタ出力Ａを除算器２２で運転台数Ｂで除算して無効電力補償の指令値とする。   The number control unit 20 limits the output of the voltage fluctuation compensation unit 2 to a limiter value corresponding to the number of operating units B with a variable limiter 21 and divides this limiter output A by the number of operating units B with a divider 22 to compensate for reactive power. Use command value.

可変リミッタ２１は、運転台数１台のときのリミッタ値を１．０とすると、運転台数２台のときにはリミッタ値を２．０とし、運転台数４台のときにはリミッタ値を４．０とすることで、無効電力補償量のリミッタ値は運転中の全交直変換装置がもつ無効電力補償量の総和に制限する。   The variable limiter 21 has a limiter value of 2.0 when the number of operating units is 1.0, and a limiter value of 2.0 when the number of operating units is four, and a limiter value of 4.0 when the number of operating units is four. Therefore, the limit value of the reactive power compensation amount is limited to the total reactive power compensation amount of all the AC / DC converters in operation.

除算器２２は、運転中の全交直変換装置による無効電力補償量の総和を運転台数で除算することで、各交直変換装置に対する無効電力補償量を均等にする。   The divider 22 divides the total amount of reactive power compensation by all the AC / DC converters in operation by the number of operating units, thereby equalizing the amount of reactive power compensation for each AC / DC converter.

図４は無効電力発生量の応答例を示す。同図の（ａ）は１台運転時の応答例を示し、（ｂ）は２台運転時の従来の応答例を示し、従来の制御では運転台数が異なることで、無効電力発生量の応答が異なる。制御ゲインの再調整（台数ごとにゲインを調整）する必要がある。   FIG. 4 shows a response example of the reactive power generation amount. (A) of the figure shows an example of response during operation of one unit, (b) shows an example of conventional response during operation of two units, and the response of the reactive power generation amount due to the difference in the number of units operated in conventional control. Is different. It is necessary to readjust the control gain (adjust the gain for each unit).

（ｃ）は本実施形態による２台運転時の応答例を示し、（ａ）に示す１台運転時とは同等の応答性を呈し、電圧変動補償の制御パラメータを再調整する必要がない。また、１台当たりの無効電力発生量のリミッタ値は均等になる。   (C) shows an example of the response at the time of two-unit operation according to this embodiment, exhibits the same responsiveness as that at the time of one-unit operation shown in (a), and does not need to readjust the control parameter for voltage fluctuation compensation. Further, the limit value of the amount of reactive power generated per unit is equalized.

したがって、台数制御部２０は、ＳＶＣ装置全体としての無効電力発生量は無効電力指令値×運転台数に調節するが、各交直変換装置による無効電力補償量は変化しない。また、運転台数に合わせて電圧変動補償のリミッタ値を変化させることで、電圧変動補償出力を台数で割っても運転台数１台の場合と同スケールの無効電力指令値を発生させることができる。   Therefore, the number control unit 20 adjusts the reactive power generation amount as the entire SVC device to the reactive power command value × the number of operating units, but the reactive power compensation amount by each AC / DC converter does not change. Further, by changing the voltage fluctuation compensation limiter value in accordance with the number of operating units, even if the voltage fluctuation compensating output is divided by the number of units, a reactive power command value of the same scale as in the case of one operating unit can be generated.

１００ ＳＶＣ（静止型無効電力補償装置）
２００ 負荷
１１０ 連系変圧器
１２０ ＬＣフィルタ
１３０ 交直変換装置（ＩＮＶ）
１４０ ＳＶＣ制御装置
１４１ 無効電力指令値演算部
１４２，１４３ ＩＮＶ制御装置
１ 実効値演算部
２ 電圧変動補償部
１０ 電圧指令値演算部
２０ 台数制御部 100 SVC (Static reactive power compensator)
200 Load 110 Interconnection transformer 120 LC filter 130 AC / DC converter (INV)
140 SVC Control Device 141 Reactive Power Command Value Calculation Unit 142, 143 INV Control Device 1 RMS Value Calculation Unit 2 Voltage Fluctuation Compensation Unit 10 Voltage Command Value Calculation Unit 20 Number Control Unit

Claims (2)

電力系統に対し、無効電力量を制御できる無効電力制御装置を負荷と並列接続し、無効電力指令値演算部は、系統電圧検出値と系統電圧指令値との偏差に応じて電圧変動補償部で演算し、前記無効電力制御装置の無効電力指令値（Ｑ＿ｒｅｆ）を求める無効電力補償装置において、
前記系統電圧指令値を設定する電圧指令値演算部は、定常時は系統電圧検出値に一致した電圧指令値を出力し、系統電圧が変動したときに単位時間当たり所定の増減量を有して系統電圧に追従変化する電圧指令値（Ｖｓ＿ｒｍｓ＿ｒｅｆ）を出力し、最終的には系統電圧検出値に一致した電圧指令値に収束させる演算手段を備えると共に、
前記電圧指令値演算部は、
前記無効電力指令値（Ｑ＿ｒｅｆ）の正負極性を判定する符号判定器と、
前記符号判定器の正負判定出力に単位時間当たりの所定の増減量を掛け合わせて電圧指令値の正負増減分（±ΔＶ＿ｒｍｓ）を演算周期毎に求める乗算器と、
演算周期１周期前（Ｚ−１）の前記電圧指令値の出力を保持する保持回路と、
前記乗算器で求める正負増減分を前記保持回路に保持する電圧指令値に足し合わせて現在の電圧指令値として記憶更新しておき、無効電力補償を開始したときには現在の系統電圧検出値に初期化するリセット機能付レジスタと、
前記レジスタで記憶更新した電圧指令値を一定範囲に制限して前記電圧指令値（Ｖｓ＿ｒｍｓ＿ｒｅｆ）として出力するリミッタと、
を備えたことを特徴とする無効電力補償装置。 A reactive power control device capable of controlling the reactive power amount is connected in parallel to the load for the power system, and the reactive power command value calculation unit is a voltage fluctuation compensation unit according to the deviation between the system voltage detection value and the system voltage command value. In the reactive power compensator that calculates and obtains the reactive power command value (Q_ref) of the reactive power control device,
The voltage command value calculation unit for setting the system voltage command value outputs a voltage command value that matches the system voltage detection value in a steady state, and has a predetermined increase / decrease amount per unit time when the system voltage fluctuates. Rutotomoni an arithmetic means for outputting a voltage command value to follow changes in the system voltage (Vs_rms_ref), and finally converge to the voltage command value that matches the system voltage detection value,
The voltage command value calculator is
A sign determiner for determining positive and negative polarity of the reactive power command value (Q_ref);
A multiplier for multiplying a positive / negative determination output of the sign determination unit by a predetermined increase / decrease amount per unit time to obtain a positive / negative increase / decrease (± ΔV_rms) of the voltage command value for each calculation cycle;
A holding circuit for holding the output of the voltage command value one cycle before the calculation cycle (Z-1);
The positive / negative increase / decrease obtained by the multiplier is added to the voltage command value held in the holding circuit to be stored and updated as the current voltage command value, and initialized to the current system voltage detection value when reactive power compensation is started. Register with reset function to
A limiter that limits the voltage command value stored and updated in the register to a certain range and outputs the voltage command value (Vs_rms_ref);
A reactive power compensator characterized by comprising: 前記無効電力制御装置を複数台並列に設けると共に、前記電圧指令値演算部の出力側に台数制御部を設け、
前記台数制御部は、前記電圧変動補償部の演算値を入力して前記無効電力制御装置の運転台数（Ｂ）に比例したリミッタ値に制限する可変リミッタと、
前記可変リミッタの出力（Ａ）を前記運転台数（Ｂ）で除算して前記無効電力指令値（Ｑ＿ｒｅｆ）とする除算器とを備えたことを特徴とする請求項１に記載の無効電力補償装置。 A plurality of reactive power control devices are provided in parallel, and a number control unit is provided on the output side of the voltage command value calculation unit,
The number control unit inputs a calculated value of the voltage fluctuation compensation unit and limits a limiter value proportional to the number of operating reactive power control devices (B), and a variable limiter,
Reactive power compensator according to claim 1, characterized in that a divider to divide to the reactive power command value (Q_ref) in the variable limiter the number of operating output (A) of (B) .
JP2011186729A 2011-08-30 2011-08-30 Reactive power compensator Active JP5760860B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011186729A JP5760860B2 (en) 2011-08-30 2011-08-30 Reactive power compensator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011186729A JP5760860B2 (en) 2011-08-30 2011-08-30 Reactive power compensator

Publications (2)

Publication Number Publication Date
JP2013051743A JP2013051743A (en) 2013-03-14
JP5760860B2 true JP5760860B2 (en) 2015-08-12

Family

ID=48013380

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2011186729A Active JP5760860B2 (en) 2011-08-30 2011-08-30 Reactive power compensator

Country Status (1)

Country Link
JP (1) JP5760860B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104037775B (en) * 2014-05-14 2016-01-27 浙江大学 A kind of power-system short-term Voltage Stability Control method
CN104362642B (en) * 2014-10-27 2017-01-11 国家电网公司 Dynamic reactive reserved optimizing method for improving long-term voltage stabilization in AC/DC (Alternating Current/Direct Current) power grid
CN110148951B (en) * 2019-06-25 2021-01-08 许继集团有限公司 Double-target voltage coordination control method and control device for dynamic reactive power compensation device
CN110808591B (en) * 2019-11-03 2021-01-26 国网湖北省电力有限公司电力科学研究院 Phase modulator excitation control parameter setting method considering direct current dynamic characteristic influence

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3443681B2 (en) * 1997-11-21 2003-09-08 株式会社日立製作所 Reactive power compensation system
JP3408966B2 (en) * 1998-04-07 2003-05-19 三菱電機株式会社 Power command device and power command method
JP4198404B2 (en) * 2002-07-08 2008-12-17 株式会社三社電機製作所 Reactive power compensation system
JP2007097373A (en) * 2005-09-30 2007-04-12 Hitachi Ltd Electric power controlling device
JP4908192B2 (en) * 2006-12-28 2012-04-04 株式会社東芝 Reactive power compensation apparatus and method

Also Published As

Publication number Publication date
JP2013051743A (en) 2013-03-14

Similar Documents

Publication Publication Date Title
CN107836077B (en) Motor control device
JP6510741B1 (en) SYSTEM, CONTROL DEVICE, AND CONTROL METHOD OF SYSTEM
JP5893057B2 (en) Isolated operation detection device and isolated operation detection method
JP6398414B2 (en) Power storage system, power conversion device, self-sustaining operation system, and power storage system control method
JP6059757B2 (en) System voltage suppression control device and system voltage suppression control method
JP5760860B2 (en) Reactive power compensator
US20160087530A1 (en) Ringing Suppression Method and Apparatus for Power Converters
JP2018196182A (en) Control device and reactive power compensation apparatus
WO2012169013A1 (en) Operation control device for photovoltaic power generation system
JP5338353B2 (en) Voltage control method for parallel sag compensator and parallel sag compensator
JP2019003454A (en) Ac-dc converter control system
JP2012175753A (en) Reactive power compensation device
JP6183190B2 (en) Power converter
JP2018121379A (en) Controller of frequency conversion system
JP7078463B2 (en) Power system stabilization system
JP4896044B2 (en) Power converter
WO2017016485A1 (en) Method and device for regulating pulse in multi-level converter, and multi-level converter
JP2013212021A (en) Reactive power compensator
JP2017034737A (en) Power conversion device controller, control method, and control program, and power conversion system
JP6500738B2 (en) Power converter and control method thereof
JP4875547B2 (en) Reactive power compensator and control method thereof
JP2022148986A (en) Grid-connected power conversion device and control method for grid-connected power conversion device
RU2573599C1 (en) Device to compensate high harmonics and correct grid asymmetry
KR101287887B1 (en) Control apparatus of thyristor controlled reactor for static var compensator
JP5678844B2 (en) Control device for power converter

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20140725

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20150304

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20150310

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20150421

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20150512

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20150525

R150 Certificate of patent or registration of utility model

Ref document number: 5760860

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150