JP4488846B2 - Control method of static reactive power compensator - Google Patents

Control method of static reactive power compensator Download PDF

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JP4488846B2
JP4488846B2 JP2004261795A JP2004261795A JP4488846B2 JP 4488846 B2 JP4488846 B2 JP 4488846B2 JP 2004261795 A JP2004261795 A JP 2004261795A JP 2004261795 A JP2004261795 A JP 2004261795A JP 4488846 B2 JP4488846 B2 JP 4488846B2
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reactive power
power compensator
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vlow
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純也 篠原
喜延 植田
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Meidensha Corp
Chugoku Electric Power Co Inc
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Description

本発明は静止形無効電力補償装置の制御方法に係わり、特に既設の自動電圧調整装置に併設される静止形無効電力補償装置の制御方法に関するものである。   The present invention relates to a method for controlling a static reactive power compensator, and more particularly, to a method for controlling a static reactive power compensator provided in an existing automatic voltage regulator.

配電系統には、電圧変動の抑制や電圧安定化を目的として無効電力補償装置が設置されている。この無効電力補償装置としては、タップ付きトランスを使用したＳＶＲ（Step Voltage Regulator:自動電圧調整装置）のような機械式の装置と電力半導体素子を使用した静止形のものとが存在している。
これら無効電力補償装置のうち、ＳＶＲの場合には機械式接点制御となるために急激な変動には追従できなく、また、静止形無効電力補償装置の場合には、その高速応答性と繰り返し動作が可能のことから、配電系統における電圧変動対策としては、ＳＶＲに比較して電圧変動に対するより有効な解決方法となっている。
その反面、静止形のものは、電力半導体素子を適用しているので、ＳＶＲ等の機械式の装置と比較すると高価となる場合が多い。
したがって、既設のＳＶＲに併設して小容量・短時間動作の静止形無効電力補償装置を設け、ＳＶＲでは対応できない急激な変動を静止形無効電力補償装置にて補償し、緩やかな電圧変動に対してはＳＶＲ等で補償する方法が特許文献１等によって知られている。
特許第３３１８５０９号公報 In the power distribution system, a reactive power compensator is installed for the purpose of suppressing voltage fluctuation and stabilizing the voltage. As this reactive power compensator, there are a mechanical device such as an SVR (Step Voltage Regulator) using a tapped transformer and a static device using a power semiconductor element.
Among these reactive power compensators, in the case of SVR, since it is a mechanical contact control, it cannot follow rapid fluctuations, and in the case of a static reactive power compensator, its fast response and repetitive operation Therefore, as a countermeasure against voltage fluctuation in the distribution system, it is a more effective solution to voltage fluctuation than SVR.
On the other hand, since the power semiconductor element is applied to the stationary type, it is often more expensive than a mechanical device such as SVR.
Therefore, a static reactive power compensator with small capacity and short-time operation is provided alongside the existing SVR, and sudden fluctuations that cannot be handled by the SVR are compensated by the static reactive power compensator, so For example, Patent Document 1 discloses a method for compensating with SVR or the like.
Japanese Patent No. 3318509

特許文献１のものは、無効電力制御用のリアクトルと直列に接続された位相制御スイッチを制御するために、配電系統の無効電力を検出し、設定電圧に対して常に電圧一定制御を継続しながら、緩やかな負荷変動に対しては設定電圧を変化させて無効電力出力を目標範囲内に保持し、急激な負荷変動に対しては、静止形無効電力電圧補償装置で保持されている無効電力容量を活用して電圧変動を抑えるようにしたものである。このため、この制御方法の場合、無効電力検出装置等が必要となっている。   In Patent Document 1, in order to control a phase control switch connected in series with a reactor for reactive power control, the reactive power of the distribution system is detected, and constant voltage control is always continued with respect to the set voltage. The reactive power output is maintained within the target range by changing the set voltage for moderate load fluctuations, and the reactive power capacity held by the static reactive power voltage compensator for sudden load fluctuations Is used to suppress voltage fluctuations. For this reason, in the case of this control method, a reactive power detection device or the like is required.

そこで、本発明が目的とするところは、無効電力補償装置の電圧指令値を演算する際には、補償無効電力を参照することなく制御を可能とし、且つ他の電圧調整装置と自律的に協調動作可能な静止形無効電力補償装置の制御方法を提供することにある。   Therefore, an object of the present invention is to enable control without referring to the compensation reactive power when calculating the voltage command value of the reactive power compensation device, and to cooperate autonomously with other voltage regulation devices. An object of the present invention is to provide a control method for an operable static reactive power compensator.

本発明の第１は、配電系統に静止形のインバータを有する無効電力補償装置を接続し、制御部及びインバータを介して生成された無効電力量を配電系統に供給するものにおいて、
前記配電系統の電圧を導入して移動基準電圧を生成する移動基準電圧生成部と、この移動基準電圧と固定基準電圧とを比較して大きい方を選択する上限設定部、及び小さい方を選択する下限設定部よりなる電圧指令値演算部とを備え、上限設定部と下限設定部との各出力信号と前記系統電圧との大小関係によって電圧指令値を決定することを特徴としたものである。
本発明の第２は、前記電圧指令値演算部の上限設定部の出力に不感帯幅設定値dＶを加算した値をＶhighとし、前記下限設定値より不感帯幅設定値を減じた値をＶlowとし、それぞれの値と系統電圧Ｖとの大小関係により電圧指令値を決定することを特徴としたものである。
本発明の第３は、前記電圧指令値演算部からの電圧指令値Ｖcは、Ｖhigh＜Ｖ時はＶc＝Ｖhigh、Ｖhigh−dＶ＜Ｖ＜Ｖhigh時はＶcを変更せず、 Ｖlow＋dＶ＜Ｖ＜Ｖhigh−dＶ時にはＶc＝Ｖ、Ｖlow＜Ｖ＜Ｖlow＋dＶ時には Ｖcを変更せず、Ｖ＜Vlow時はＶc＝Ｖlowとしたことを特徴としたものである。
本発明の第４は、前記電圧指令値は、系統電圧の変動に対して緩やかに変動させることを特徴としたものである。
本発明の第５は、前記静止形無効電力補償装置は、自動電圧調整装置と併設されることを特徴としたものである。 In the first aspect of the present invention, a reactive power compensator having a stationary inverter is connected to a power distribution system, and the reactive power amount generated via the control unit and the inverter is supplied to the power distribution system.
A moving reference voltage generating unit that generates a moving reference voltage by introducing a voltage of the distribution system, an upper limit setting unit that compares the moving reference voltage with a fixed reference voltage and selects a larger one, and selects a smaller one A voltage command value calculation unit including a lower limit setting unit, and the voltage command value is determined according to the magnitude relationship between the output signals of the upper limit setting unit and the lower limit setting unit and the system voltage.
According to a second aspect of the present invention, a value obtained by adding a dead band setting value dV to the output of the upper limit setting unit of the voltage command value calculation unit is Vhigh, and a value obtained by subtracting the dead band setting value from the lower limit setting value is Vlow. The voltage command value is determined by the magnitude relationship between each value and the system voltage V.
According to a third aspect of the present invention, the voltage command value Vc from the voltage command value calculation unit is Vc = Vhigh when Vhigh <V, Vc is not changed when Vhigh−dV <V <Vhigh, and Vlow + dV <V <Vhigh. Vc = V when -dV, Vc is not changed when Vlow <V <Vlow + dV, and Vc = Vlow when V <Vlow.
A fourth aspect of the present invention is characterized in that the voltage command value is gradually changed with respect to the fluctuation of the system voltage.
According to a fifth aspect of the present invention, the static reactive power compensator is provided together with an automatic voltage regulator.

以上のとおり、本発明によれば、無効電力補償装置の電圧指令値を演算するに際して、補償するための無効電力を参照することなく演算できるため演算部分が簡単となり、また、この電圧指令値を系統電圧の変動に対して緩やかに変化させることで、ＳＶＲ等の電圧調整装置と組み合わせた場合、速い変動に関しては無効電力補償装置によって補償し、緩やかな変動はにＳＶＲ等によって補償することが可能になる。   As described above, according to the present invention, when calculating the voltage command value of the reactive power compensator, the calculation can be simplified without referring to the reactive power for compensation, and the voltage command value can be calculated. When combined with a voltage regulator such as SVR, it is possible to compensate for fast fluctuations with a reactive power compensator and compensate for moderate fluctuations with SVR, etc. become.

図１は、無効電力補償装置の構成図を示したもので、ＳＶＲ等の既設の電圧調整装置は省略して図示している。１は一次側が配電系統に接続された連系変圧器、２はリアクトル、３は電力変換装置で、ここでは自励式インバータが使用されるが、この電力変換装置３としては、高調波電流を補償するアクティブフィルタや不平衡電流補償機能を有した多機能の補償装置、及びサイリスタとリアクトルの組み合わせによる無効電力補償装置でもよい。この電力変換装置３は、リアクトル２，連系変圧器１を介して配電系統との電力の授受を実行する。４は制御部で、連系変圧器１の一次側電圧Ｖとリアクトル２を流れた電流Ｉをそれぞれ導入して電力変換装置３の制御信号を演算する。そして、１〜４によって静止形の無効電力補償装置が構成される。   FIG. 1 shows a configuration diagram of a reactive power compensator, in which an existing voltage regulator such as SVR is omitted. Reference numeral 1 is an interconnection transformer whose primary side is connected to the power distribution system, 2 is a reactor, 3 is a power converter, and a self-excited inverter is used here, but the power converter 3 compensates for harmonic current. A multi-function compensator having an active filter or an unbalanced current compensation function, and a reactive power compensator using a combination of a thyristor and a reactor may be used. The power conversion device 3 executes power transfer with the power distribution system via the reactor 2 and the interconnection transformer 1. A control unit 4 introduces the primary voltage V of the interconnection transformer 1 and the current I flowing through the reactor 2 to calculate a control signal of the power converter 3. Then, 1 to 4 constitute a static reactive power compensator.

本発明における無効電力補償装置は、系統電圧に合わせて緩やかに変化する移動基準電圧に対して、不感帯分の電圧差を残して一致するように系統電圧を制御するものである。すなわち、高速な変動のみを補償し、低速な変動は既設のＳＶＲ等によって補償させる。また、系統電圧と固定基準電圧との差が許容電圧幅を超えた場合は、装置容量の範囲内で系統電圧が許容電圧範囲に入るよう制御することで、低速な電圧変動であっても、変動幅が大きい場合には、本発明による無効電力補償装置によって補償を行うようにしたものである。
図２は移動基準電圧の演算回路と動作範囲の説明図で、（ａ）は演算回路、（ｂ）は変動範囲を示したものである。検出された配電系統の電圧（実効値）Ｖは、ローパスフィルタ２１を通ってリミッタ回路２２に導入され、移動基準電圧Ｖrefとして出力される。このリミッタ回路２２は、移動基準電圧Ｖrefの生成部となる。ここで、固定基準電圧をＶ0、不感帯幅をｄＶ、許容電圧をｄＶlimとすると、Ｖrefの移動許容電圧の変動幅は図２（ｂ）のようになる。
すなわち、移動基準電圧Ｖrefは、系統電圧Ｖに対して遅れをもって追従し、且つリミッタ回路２２により、Ｖ0−（ｄＶlim−ｄＶ）〜Ｖ0＋（ｄＶlim−ｄＶ）の範囲で変化する。
なお、不感帯幅ｄＶとしては、系統電圧Ｖが固定基準電圧Ｖ0から離れる所定の範囲と、移動基準電圧Ｖrefの移動上限範囲と系統電圧Ｖの上下限値間に設けられ、系統電圧Ｖの上下限値と固定基準電圧Ｖ0間が許容電圧幅Ｖlimとなっている。 The reactive power compensator according to the present invention controls the system voltage so that the moving reference voltage that changes gently according to the system voltage is matched with the voltage difference corresponding to the dead band. That is, only high-speed fluctuations are compensated, and low-speed fluctuations are compensated by an existing SVR or the like. In addition, when the difference between the system voltage and the fixed reference voltage exceeds the allowable voltage range, by controlling the system voltage to enter the allowable voltage range within the device capacity range, When the fluctuation range is large, compensation is performed by the reactive power compensator according to the present invention.
FIG. 2 is an explanatory diagram of a calculation circuit and an operation range of the moving reference voltage. The detected voltage (effective value) V of the distribution system is introduced into the limiter circuit 22 through the low-pass filter 21 and output as the movement reference voltage Vref. The limiter circuit 22 serves as a generation unit for the movement reference voltage Vref. Here, assuming that the fixed reference voltage is V 0 , the dead band width is dV, and the allowable voltage is dVlim, the fluctuation width of the movement allowable voltage of Vref is as shown in FIG.
That is, the movement reference voltage Vref follows the system voltage V with a delay, and is changed by the limiter circuit 22 in the range of V 0 − (dVlim−dV) to V 0 + (dVlim−dV).
The dead band width dV is provided between a predetermined range in which the system voltage V is separated from the fixed reference voltage V 0 , a moving upper limit range of the moving reference voltage Vref, and an upper and lower limit value of the system voltage V. The allowable voltage width Vlim is between the lower limit value and the fixed reference voltage V0.

図３は、制御回路４の具体的な制御ブロック図を示したものである。
２０は後述する電圧指令値演算部で、この演算部２０において演算された値が電圧指令値Ｖｃとして加算部１０に出力され、検出された系統電圧Ｖとの偏差が求められる。この偏差信号は制御ゲイン部１１に出力されて所定のゲインとされた後にリミッタ回路１２に出力される。リミッタ回路１２は無効電流を制限するためのもので、無効電力補償装置の容量に応じて制限を加え、固定基準電圧Ｖ0から離れる方向には補償は行わない機能、すなわち、Ｖ＜Ｖ0の場合には電圧下げ方向の補償は実行しない機能を持たせており、このリミッタ回路１２から補償電流指令値として電流制御部１３に出力される。電流制御部１３には、検出された電力変換装置（自励式インバータ）３の出力電流が入力され、各入力信号に基づいてインバータの電圧指令値が演算される。１４はインバータのＰＷＭ制御回路で、このＰＷＭ制御回路は電圧指令値に基づいてＰＷＭ制御信号を生成し、インバータのスイッチング素子用ゲート信号としてインバータに出力し、このインバータを電流源として動作させる。 FIG. 3 shows a specific control block diagram of the control circuit 4.
Reference numeral 20 denotes a voltage command value calculation unit which will be described later. A value calculated by the calculation unit 20 is output to the addition unit 10 as a voltage command value Vc, and a deviation from the detected system voltage V is obtained. The deviation signal is output to the control gain unit 11 to obtain a predetermined gain, and then output to the limiter circuit 12. The limiter circuit 12 is for limiting the reactive current. The limiter circuit 12 limits the reactive power according to the capacity of the reactive power compensator, and does not perform compensation in the direction away from the fixed reference voltage V 0 , that is, V <V 0 . In this case, a function of not performing compensation in the voltage lowering direction is provided, and the limiter circuit 12 outputs a compensation current command value to the current control unit 13. The detected output current of the power conversion device (self-excited inverter) 3 is input to the current control unit 13, and a voltage command value of the inverter is calculated based on each input signal. Reference numeral 14 denotes an inverter PWM control circuit. The PWM control circuit generates a PWM control signal based on the voltage command value, outputs the PWM control signal to the inverter as a switching element gate signal, and operates the inverter as a current source.

電圧指令演算部２０は図４のように構成されている。２１，２２は図２（ａ）で示したローパスフィルタとリミッタ回路の移動基準電圧生成部で、この生成部から出力された移動基準電圧Ｖrefは、上限設定部２３と下限設定部２４との各一方の端子にそれぞれ印加される。また、各設定部２３，２４の他方の端子には、固定基準電圧Ｖ0がそれぞれ印加されている。上限設定部２３は、入力された移動基準電圧Ｖrefと固定基準電圧Ｖ0のうち大きい方の値を選択し、加算部２５において選択値に不感帯幅ｄＶを加えたものを電圧Ｖhighとされる。また、下限設定部２４では、移動基準電圧Ｖrefと固定基準電圧Ｖ0のうちから小さい方の値を選択し、加算部２６においてこの選択値から不感帯幅ｄＶを減じたものを電圧Ｖlowとして出力する。２７は選択部で、この選択部において系統電圧ＶとＶhigh、Ｖlowとの大小関係により電圧指令値Ｖｃを決定する。 The voltage command calculation unit 20 is configured as shown in FIG. Reference numerals 21 and 22 denote moving reference voltage generators of the low-pass filter and limiter circuit shown in FIG. 2A. The moving reference voltage Vref output from the generator is the same as that of the upper limit setting unit 23 and the lower limit setting unit 24. Applied to one terminal respectively. A fixed reference voltage V 0 is applied to the other terminal of each setting unit 23, 24. The upper limit setting unit 23 selects the larger value of the input movement reference voltage Vref and fixed reference voltage V 0 , and the addition unit 25 adds the dead band width dV to the selected value as the voltage Vhigh. The lower limit setting unit 24 selects a smaller value from the movement reference voltage Vref and the fixed reference voltage V 0 , and the addition unit 26 outputs a value obtained by subtracting the dead band width dV from the selected value as the voltage Vlow. . Reference numeral 27 denotes a selection unit which determines a voltage command value Vc based on the magnitude relationship between the system voltage V and Vhigh and Vlow.

図５は電圧指令値演算部の演算結果に伴う判定区分図で、電圧値Ｖhighと系統電圧Ｖとの関係が、No.１〜No.５の状態に区分され、各状態に対応して制御目標となる電圧指令値Ｖｃが選択され出力される。
すなわち、電圧指令値演算部２０により演算された電圧値Ｖhighと系統電圧Ｖとの関係が、Ｖhigh＜Ｖのとき（Ｎｏ.１）には、Ｖｃ＝Ｖhighを電圧指令値として加算部１０に出力され系統電圧Ｖとの偏差信号が得られる。また、Ｎｏ.２のようにＶhigh−ｄＶ＜Ｖ＜ＶhighのときにはＶｃは変更しなく、以下図５のＮｏ３〜Ｎｏ５で示すような演算を実行する。 FIG. 5 is a determination division diagram according to the calculation result of the voltage command value calculation unit. The relationship between the voltage value Vhigh and the system voltage V is divided into No. 1 to No. 5 states, and control is performed corresponding to each state. A target voltage command value Vc is selected and output.
That is, when the relationship between the voltage value Vhigh calculated by the voltage command value calculation unit 20 and the system voltage V is Vhigh <V (No. 1), Vc = Vhigh is output to the addition unit 10 as a voltage command value. Thus, a deviation signal from the system voltage V is obtained. Further, as in No. 2, when Vhigh−dV <V <Vhigh, Vc is not changed, and the calculations as shown in No. 3 to No. 5 in FIG.

図６は、図5の判定区分に基づく具体的な動作モードである。ここでは、初期条件として、系統電圧Ｖが固定基準電圧Ｖ0に一致しているものとする。このときは、Ｖref＝Ｖ0，Ｖlow＝Ｖ0−ｄＶ，Ｖhigh＝Ｖ0＋ｄＶである。
例えば、負荷投入などによって系統電圧ＶがＶlow以下に低下すると、無効電力補償装置は目標電圧Ｖｃ＝Ｖlowに向けて電圧上げ補償を開始する。図６（ａ）は系統電圧Ｖが、時刻ｔ0でＶ0−dVlim＜Ｖ＜Ｖ0−ｄＶに低下した場合で、無効電力補償装置（ＳＶＣ）は目標電圧Ｖｃ＝Ｖlowに向けて電圧上げ補償を開始する。この電圧上げ制御開始後の時刻ｔ1となると、時間の経過に伴って移動基準電圧Ｖrefが次第に低下するため、電圧指令値演算部２０からの出力Ｖlowも次第に低下してＶ＝Ｖlowとなった時刻ｔ2の時点で次第に補償電流が絞られる（実際の動作としては、Ｖ＝Ｖlowを保ったままＶが低下する）。やがては、無効電力補償装置の補償電流は０となるが、補償電流０となった時点で、Ｖ＞Ｖ0−ｄＶlim（Ｖlow＝Ｖ0−ｄＶlim＋ｄＶ）となっていれば、以後は無効電力補償装置による補償動作は行わない。しかし、Ｖ＝Ｖ0−ｄＶlimとなったとき、無効電力補償装置による補償電流が０になっていなければ、図6（ｂ）で示すように無効電力補償装置及びＳＶＣは補償動作を継続する。 FIG. 6 shows a specific operation mode based on the determination category of FIG. Here, as an initial condition, it is assumed that the system voltage V matches the fixed reference voltage V0. At this time, Vref = V0, Vlow = V0-dV, and Vhigh = V0 + dV.
For example, when the system voltage V drops below Vlow due to loading or the like, the reactive power compensator starts compensation for voltage increase toward the target voltage Vc = Vlow. FIG. 6A shows the case where the system voltage V drops to V0−dVlim <V <V0−dV at time t0, and the reactive power compensator (SVC) starts compensation for increasing the voltage toward the target voltage Vc = Vlow. To do. At time t1 after the start of this voltage increase control, the movement reference voltage Vref gradually decreases with the passage of time, and therefore the output Vlow from the voltage command value calculation unit 20 also gradually decreases to V = Vlow. The compensation current is gradually reduced at time t2 (in actual operation, V decreases while V = Vlow is maintained). Eventually, the compensation current of the reactive power compensator becomes zero, but if V> V 0 -dVlim (Vlow = V 0 -dVlim + dV) when the compensation current becomes zero, reactive power compensation is performed thereafter. No compensation operation is performed by the device. However, when V = V 0 −dVlim, if the compensation current by the reactive power compensator is not zero, the reactive power compensator and the SVC continue the compensation operation as shown in FIG.

図6（ｃ）は、ＳＶＣの補償中に負荷が緩やかに減少した場合の動作モードである。すなわち、無効電力補償装置並びにＳＶＣが補償動作を実行している時刻ｔ1より負荷が減少などして系統電圧Ｖが緩やかに上昇しようとした場合、無効電力補償装置は、時刻ｔ1から補償電流が０になるまで目標電圧Ｖc一定で動作し、時刻ｔ2で補償電流０となると補償を停止する。その後、系統電圧Ｖは緩やかに固定基準電圧Ｖ0向かって上昇し、時刻ｔ3で一定となる。
図6（ｄ）は無効電力補償装置の補償動作中に、Ｖ＜Ｖ0となった場合を示したものである。補償中である時刻ｔ1で、併設されるＳＶＲの電圧上げ動作や負荷解放などにより系統電圧Ｖがステップ状に上昇し、その上昇幅が小さくて固定基準電圧Ｖ0以下であった場合には、目標電圧一定で動作する。
図6（ｅ）無効電力補償装置の補償動作中の時刻ｔ1に、ＳＶＲの電圧上げ動作や負荷解放などにより系統電圧Ｖがステップ状に上昇し、その上昇幅が大きくて固定基準電圧を超えた場合を示したものである。この場合、無効電力補償装置による補償動作は中止する。
以上のように、図5で示す判断区分に対応して無効電力補償装置は補償動作を実行する。 FIG. 6C shows an operation mode in the case where the load gradually decreases during the SVC compensation. That is, when the system voltage V is about to rise gradually due to a decrease in load or the like from time t1 when the reactive power compensator and the SVC are performing the compensation operation, the reactive power compensator has a compensation current of 0 from time t1. The operation is performed at a constant target voltage Vc until the compensation current is reached. When the compensation current becomes 0 at time t2, the compensation is stopped. Thereafter, the system voltage V gradually increases toward the fixed reference voltage V0 and becomes constant at time t3.
FIG. 6D shows a case where V <V0 during the compensation operation of the reactive power compensator. At the time t1 during compensation, when the system voltage V rises stepwise due to the voltage increase operation of the SVR and load release, etc., and the increase width is small and is below the fixed reference voltage V0, the target Operates at a constant voltage.
FIG. 6 (e) At time t1 during the compensation operation of the reactive power compensator, the system voltage V rises stepwise due to the SVR voltage raising operation or the load release, and the rise is large and exceeds the fixed reference voltage. The case is shown. In this case, the compensation operation by the reactive power compensator is stopped.
As described above, the reactive power compensator performs the compensation operation in accordance with the judgment category shown in FIG.

本発明の実施形態を示す無効電力補償装置の構成図。The block diagram of the reactive power compensation apparatus which shows embodiment of this invention. 移動基準電圧生成部の説明図で、（ａ）は回路図、（ｂ）は変動範囲図。It is explanatory drawing of a movement reference voltage generation part, (a) is a circuit diagram, (b) is a fluctuation range figure. 本発明の制御ブロック図。The control block diagram of this invention. 電圧指令演算部の構成図。The block diagram of a voltage command calculating part. 電圧指令演算部の判定区分図。FIG. 3 is a determination division diagram of a voltage command calculation unit. 補償動作モード図で、（ａ）はＶ0−ｄＶlim＜Ｖ＜Ｖ0−ｄＶの場合、（ｂ）はＶ＜Ｖ0−ｄＶlimの場合、（ｃ）は補償中に負荷減少の場合、（ｄ）は補償中のＶ＜Ｖ0の場合、（ｅ）補償中のＶ＞Ｖ0の場合。In the compensation operation mode diagram, (a) is V0−dVlim <V <V0−dV, (b) is V <V0−dVlim, (c) is a load decrease during compensation, (d) is When V <V0 during compensation, (e) When V> V0 during compensation.

符号の説明Explanation of symbols

１…連系変圧器
２…リアクトル
３…自励式インバータ
４…制御回路
１１…制御ゲイン
１２…リミッタ
１３…電流制御部
１４…ＰＷＭ制御回路
２０…電圧指令値演算部
２１…ローパスフィルタ
２２…リミッタ
２３…上限設定部
２４…下限設定部
２５、２６…加算部
２７…選択部 1 ... Interconnection transformer
2 ... Reactor
3 ... Self-excited inverter
4 ... Control circuit
11 ... Control gain
12 ... Limiter
13 ... Current controller
14 ... PWM control circuit
20 ... Voltage command value calculation unit
21 ... Low-pass filter
22 ... Limiter
23 ... Upper limit setting section
24 ... Lower limit setting section
25, 26 ... adder
27 ... Selection part

Claims (5)

配電系統に静止形のインバータを有する無効電力補償装置を接続し、制御部及びインバータを介して生成された無効電力量を配電系統に供給するものにおいて、
前記配電系統の電圧を導入して移動基準電圧を生成する移動基準電圧生成部と、この移動基準電圧と固定基準電圧とを比較して大きい方を選択する上限設定部、及び小さい方を選択する下限設定部よりなる電圧指令値演算部とを備え、上限設定部と下限設定部との各出力信号と前記系統電圧との大小関係によって電圧指令値を決定することを特徴とした静止形無効電力補償装置の制御方法。 In the case of connecting a reactive power compensator having a stationary inverter to the distribution system and supplying the reactive power generated through the control unit and the inverter to the distribution system,
A moving reference voltage generating unit that generates a moving reference voltage by introducing a voltage of the distribution system, an upper limit setting unit that compares the moving reference voltage with a fixed reference voltage and selects a larger one, and selects a smaller one A static reactive power comprising a voltage command value calculation unit comprising a lower limit setting unit, wherein the voltage command value is determined by the magnitude relationship between each output signal of the upper limit setting unit and the lower limit setting unit and the system voltage. Compensation device control method. 前記電圧指令値演算部の上限設定部の出力に不感帯幅設定値dＶを加算した値をＶhighとし、前記下限設定値より不感帯幅設定値を減じた値をＶlowとし、それぞれの値と系統電圧Ｖとの大小関係により電圧指令値を決定することを特徴とした請求項１記載の静止形無効電力補償装置の制御方法。 The value obtained by adding the dead band setting value dV to the output of the upper limit setting unit of the voltage command value calculation unit is defined as Vhigh, and the value obtained by subtracting the dead band setting value from the lower limit setting value is defined as Vlow. The method of controlling a static reactive power compensator according to claim 1, wherein the voltage command value is determined based on a magnitude relationship between 前記電圧指令値演算部からの電圧指令値Ｖcは、Ｖhigh＜Ｖ時はＶc＝Ｖhigh、Ｖhigh−dＶ＜Ｖ＜Ｖhigh時はＶcを変更せず、 Ｖlow＋dＶ＜Ｖ＜Ｖhigh−dＶ時にはＶc＝Ｖ、Ｖlow＜Ｖ＜Ｖlow＋dＶ時には Ｖc を変更せず、Ｖ＜Vlow時はＶc＝Ｖlowとしたことを特徴とした請求項２記載の静止形無効電力補償装置の制御方法。 The voltage command value Vc from the voltage command value calculation unit is Vc = Vhigh when Vhigh <V, Vc is not changed when Vhigh−dV <V <Vhigh, Vc = V when Vlow + dV <V <Vhigh−dV, 3. The method of controlling a static reactive power compensator according to claim 2, wherein Vc is not changed when Vlow <V <Vlow + dV, and Vc = Vlow when V <Vlow. 前記電圧指令値は、系統電圧の変動に対して緩やかに変動させることを特徴とした請求項１乃至３記載の静止形無効電力補償装置の制御方法。 4. The method of controlling a static reactive power compensator according to claim 1, wherein the voltage command value is gradually changed with respect to a change in system voltage. 前記静止形無効電力補償装置は、自動電圧調整装置と併設されることを特徴とした請求項１乃至４記載の静止形無効電力補償装置の制御方法。 5. The method for controlling a static reactive power compensator according to claim 1, wherein the static reactive power compensator is provided together with an automatic voltage regulator.
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