JP2017184299A - Instantaneous voltage drop compensator - Google Patents

Instantaneous voltage drop compensator Download PDF

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JP2017184299A
JP2017184299A JP2016063271A JP2016063271A JP2017184299A JP 2017184299 A JP2017184299 A JP 2017184299A JP 2016063271 A JP2016063271 A JP 2016063271A JP 2016063271 A JP2016063271 A JP 2016063271A JP 2017184299 A JP2017184299 A JP 2017184299A
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active power
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JP6642183B2 (en
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泰宏 金剌
Yasuhiro Kanesashi
泰宏 金剌
材津　寛
Hiroshi Zaitsu
寛 材津
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Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To solve a problem that when a power failure occurs in a power system connected with an AC motor, active power and reactive power suddenly change, so that the AC motor has a power swing.SOLUTION: A controller of an instantaneous voltage drop compensator includes a power calculation part. Output effective power Pis input into the power calculation part from an output voltage Vand a load current I, calculation is executed at every constant period for output to an output frequency calculation part. The output frequency calculation part calculates a frequency command value to lower a frequency for the output effective power Pobtained at every period calculated by the power calculation part when there is a negative active power deviation, and when there is a negative active power deviation, to raise the frequency, respectively.SELECTED DRAWING: Figure 1

Description

本発明は、瞬低補償装置に係わり、特に交流モータ駆動時の電源喪失時における並列型瞬低補償装置の制御に関するものである。   The present invention relates to a voltage sag compensator, and more particularly to control of a parallel voltage sag compensator when a power supply is lost when an AC motor is driven.

図５は、特許文献１などにより公知なっている並列型瞬低補償装置の構成図を示したもので、瞬低補償装置は１〜４の機能を備えている。ＡＣ／ＤＣ変換機能を有するインバータ１の直流リンクには、二次電池や電気二重層キャパシタなどの蓄電装置４が接続されている。平常時には高速スイッチ３がオン（閉路）状態となっており、この高速スイッチ３を介して電力系統５と負荷６が連系し、負荷の平準化や電力のピークカットを目的とした電力の充放電制御が行われる。また、インバータ１は瞬低補償動作に備え、蓄電装置４に直流エネルギーを充電した状態でゲートを停止し待機している。   FIG. 5 shows a configuration diagram of a parallel type voltage sag compensator known from Patent Document 1 and the like, and the voltage sag compensator has functions 1 to 4. A power storage device 4 such as a secondary battery or an electric double layer capacitor is connected to the DC link of the inverter 1 having an AC / DC conversion function. During normal operation, the high-speed switch 3 is on (closed), and the power system 5 and the load 6 are connected via the high-speed switch 3 to charge power for the purpose of load leveling and peak cutting of power. Discharge control is performed. In addition, the inverter 1 is in a standby state with the gate stopped in a state where the energy storage device 4 is charged with DC energy in preparation for the instantaneous drop compensation operation.

制御装置２は、瞬低検出器により系統電圧Vsを監視して予め設定された閾値以下となったとき瞬低発生と判断し、高速スイッチ３をオフにして電力系統５から負荷６を切り離すと共に、インバータ１を自立運転制御に移行することで所定の時間内で負荷６に対し安定した電力を供給する。なお、電力系統の瞬低発生から瞬低検出までに僅かな遅延時間を発生する。   The control device 2 monitors the system voltage Vs with a voltage sag detector and determines that a voltage sag has occurred when the voltage falls below a preset threshold value, turns off the high-speed switch 3 and disconnects the load 6 from the power system 5. By shifting the inverter 1 to the independent operation control, stable power is supplied to the load 6 within a predetermined time. It should be noted that a slight delay time is generated from the occurrence of an instantaneous drop in the power system to the detection of the instantaneous drop.

特開２００９−２０１２３８JP 2009-201238 A

負荷６として交流モータが接続され、交流モータによりポンプやコンプレッサ等のように慣性モーメントの大きい装置を駆動する場合、瞬低が発生した際に交流モータは回生動作となって逆電力を発生する発電機となり、系統電圧の低下が瞬時に起こらない。これにより、系統電圧値の低下による瞬低検出に遅れが生じる。   When an AC motor is connected as the load 6 and a device having a large moment of inertia, such as a pump or a compressor, is driven by the AC motor, the AC motor regenerates and generates reverse power when an instantaneous drop occurs. The system voltage does not drop instantaneously. As a result, a delay occurs in the instantaneous voltage drop due to a decrease in the system voltage value.

瞬低発生により交流モータへの電力供給源がなくなるためトルクが発生されず、交流モータの負荷損失によるモータ端子電圧の周波数は低下していく。周波数が低下した状態で、瞬低補償装置から５０Hzまたは６０Hzの周波数一定の電力が供給されると、モータ端子電圧の低下した交流モータは、瞬低補償装置からの出力周波数に追従するため急加速しようとする。これにより、交流モータの有効電力・無効電力が急変し、交流モータが脱調する虞がある。   Since there is no power supply source to the AC motor due to the instantaneous drop, no torque is generated, and the frequency of the motor terminal voltage due to the load loss of the AC motor decreases. When power with a constant frequency of 50 Hz or 60 Hz is supplied from the voltage sag compensator with the frequency lowered, the AC motor whose motor terminal voltage has decreased suddenly accelerates to follow the output frequency from the voltage sag compensator. try to. As a result, the active power / reactive power of the AC motor may change suddenly, causing the AC motor to step out.

本発明が目的とするところは、交流モータの端子電圧周波数と略一致した周波数で動作させる瞬低補償装置を提供することにある。   An object of the present invention is to provide a voltage sag compensator that is operated at a frequency substantially equal to the terminal voltage frequency of an AC motor.

本発明は、電力系統に高速スイッチを介して定常運転時に力行運転される交流モータを接続し、電力系統の異常を瞬低検出器で検出し、検出した異常検出による信号で高速スイッチをオフにし、蓄電装置及びインバータを介して交流モータに電力を供給する瞬低補償装置において、
前記瞬低補償装置の制御装置は、インバータの出力電圧V0と負荷電流ILから出力有効電力PLOを定周期毎に演算する電力演算部と、
電力演算部が演算した出力有効電力PLOに対応して、正の有効電力の偏差があるときには周波数を下げ、負の有効電力の偏差があるときには周波数を上げる周波数指令値を演算する出力周波数演算部とを備えたものである。 The present invention connects an AC motor that is power-run during steady operation to a power system via a high-speed switch, detects an abnormality in the power system with a voltage sag detector, and turns off the high-speed switch with a signal from the detected abnormality detection. In the sag compensation device that supplies power to the AC motor via the power storage device and the inverter,
Said controller sag compensator includes a power calculator for calculating output active power P LO every fixed cycle and the output voltage V 0 which inverter from the load current I L,
Corresponding to the output active power P LO calculated by the power calculation unit, the output frequency calculation calculates the frequency command value that decreases the frequency when there is a positive active power deviation and increases the frequency when there is a negative active power deviation Part.

本発明の電力演算部での出力有効電力PLOの演算は、次式で行う。
PLO＝（（出力電圧RS相×負荷電流R相）−（出力電圧ST相×負荷電流T相））
×２／√３
ただし、Ｒ，Ｓ，Ｔは、三相電力系統の相、
また、本発明の電力演算部は、負荷有効電力PLを演算する機能を備え、演算された負荷有効電力PLを前記瞬低検出器に出力し、瞬低検出器は負荷有効電力PLが予め設定された閾値以下となったとき前記高速スイッチに対するオフ信号として出力する。 The calculation of the output active power PLO in the power calculation unit of the present invention is performed by the following equation.
P LO = ((Output voltage RS phase x Load current R phase)-(Output voltage ST phase x Load current T phase))
× 2 / √3
Where R, S, T are the phases of the three-phase power system,
The power calculation unit of the present invention has a function of calculating the load active power P L, and outputs the calculated load active power P L to the voltage sag detector, the voltage sag detector load active power P L Is output as an OFF signal for the high-speed switch.

本発明による電力演算部による負荷有効電力PLの演算は、次式で行う。
PL＝（（系統電圧RS相×負荷電流R相）−（系統電圧ST相×負荷電流T相））
×２／√３
ただし、Ｒ，Ｓ，Ｔは、三相電力系統の相、 The calculation of the load active power P L by the power calculation unit according to the present invention is performed by the following equation.
P L = ((system voltage RS phase x load current R phase)-(system voltage ST phase x load current T phase))
× 2 / √3
Where R, S, T are the phases of the three-phase power system,

以上のとおり、本発明によれば、出力有効電力PLOの演算機能のみで交流モータの有効電力・無効電力の急変を抑制し、交流モータの脱調が防止できるものである。更に、電力演算部に負荷有効電力PLの演算機能を持たせることで、交流モータに逆起電力が発生しても、瞬低の瞬時検出が可能となるものである。 As described above, according to the present invention, to suppress the sudden change in the active power and reactive power of the AC motor only by the calculation function of the output effective power P LO, in which the step-out of the AC motor can be prevented. Furthermore, by providing the power calculation unit with a function for calculating the load active power P L , even if a counter electromotive force is generated in the AC motor, instantaneous detection of a sag is possible.

本発明の実施形態を示す構成図。The block diagram which shows embodiment of this invention. 出力有効電力に対する出力周波数の制御説明図。Control explanatory drawing of the output frequency with respect to output active power. 出力周波数の下げ時の説明図。Explanatory drawing at the time of reduction of an output frequency. 瞬低補償期間の出力周波数決定のフローチャート。The flowchart of the output frequency determination of a sag low compensation period. 並列型瞬低補償装置の概略構成図。The schematic block diagram of a parallel type voltage sag compensator.

図１は本発明の実施例を示したもので、図５で示す従来と同一部分若しくは相当する部分に同一符号を付している。瞬低補償装置の制御装置１０は、電力演算部１１、瞬低検出器１２及び出力周波数制御部１３を備えている。電力演算部１１は負荷有効電力PLと出力有効電力PLOの演算機能を備え、負荷有効電力PLは、電圧検出部Tr1によって検出された系統電圧Vsと電流検出部CTによって検出された負荷電流ILを用いて所定の周期毎に次式により求める。
PL＝（（系統電圧RS相×負荷電流R相）−（系統電圧ST相×負荷電流T相））
×２／√３
ただし、Ｒ，Ｓ，Ｔは、三相電力系統の相、
出力有効電力PLOは、電流検出部CTによって検出された負荷電流ILと電圧検出部Tr2によって検出されたインバータ１の出力電圧V0を用いて所定の周期毎に次式により求める。
PLO＝（（出力電圧RS相×負荷電流R相）−（出力電圧ST相×負荷電流T相））
×２／√３
ただし、Ｒ，Ｓ，Ｔは、三相電力系統の相、
瞬低検出器１２は、算出された負荷有効電力PL、若しくは系統電圧Vsが設定された閾値より低下したことを判定して高速スイッチ３に対してオフ信号を出力し、高速スイッチ３が開路（解放）することで電力系統５からの負荷６に対する電力の供給を停止する。同時にインバータ１をゲートオンして蓄電装置４を電源として負荷６に対する電力供給を開始する。 FIG. 1 shows an embodiment of the present invention, in which the same or corresponding parts as those shown in FIG. The control device 10 of the voltage sag compensator includes a power calculation unit 11, a voltage sag detector 12, and an output frequency control unit 13. The power calculation unit 11 has a calculation function of the load active power P L and the output active power P LO , and the load active power P L is the load detected by the system voltage Vs detected by the voltage detection unit Tr1 and the current detection unit CT. calculated by the following equation at every predetermined period using the current I L.
P L = ((system voltage RS phase x load current R phase)-(system voltage ST phase x load current T phase))
× 2 / √3
Where R, S, T are the phases of the three-phase power system,
Output active power P LO is determined by the following equation at every predetermined period using the output voltage V 0 which inverter 1 detected by the load current I L and the voltage detection unit Tr2 detected by the current detector CT.
P LO = ((Output voltage RS phase x Load current R phase)-(Output voltage ST phase x Load current T phase))
× 2 / √3
Where R, S, T are the phases of the three-phase power system,
The voltage sag detector 12 determines that the calculated load active power P L or the system voltage Vs has fallen below a set threshold value, and outputs an OFF signal to the high-speed switch 3 so that the high-speed switch 3 is opened. (Release) stops power supply from the power system 5 to the load 6. At the same time, the inverter 1 is turned on, and power supply to the load 6 is started using the power storage device 4 as a power source.

一方、算出された出力有効電力PLOは出力周波数制御部１３に入力されてインバータ１の出力周波数を瞬低前の系統周波数ｆ0、または設定された固定の周波数ｆ1により負荷６に対する電力供給を開始する。電圧は所定値である。
以下の説明では負荷６が交流モータ負荷のみで、瞬低直後の出力周波数ｆをｆ0とする。瞬低後の交流モータの端子電圧の周波数は低下することで、装置から見ると電流が流れて有効電力か無効電力を発生している。 On the other hand, the calculated output active power P LO is input to the output frequency control unit 13 so that the output frequency of the inverter 1 is supplied to the load 6 by the system frequency f 0 before the instantaneous drop or the fixed frequency f 1 that is set. To start. The voltage is a predetermined value.
In the following description, the load 6 is only an AC motor load, and the output frequency f immediately after the instantaneous drop is assumed to be f 0 . Since the frequency of the terminal voltage of the AC motor after the voltage drop decreases, when viewed from the device, a current flows to generate active power or reactive power.

図２は横軸に有効電力値、縦軸に出力周波数の補正量を示し、インバータ１から供給される有効電力の変動分△PLOとインバータ出力周波数の変動分△ｆout関係を表したものである。正方向は瞬低補償装置から交流モータへ有効電力が流れている場合で、有効電力の増加に伴い出力周波数は下げる方向になる。これとは反対で、交流モータから瞬低補償装置へ有効電力が流れている場合には、出力周波数を上げる方向にしている。 Figure 2 is the active power value on the horizontal axis, the vertical axis indicates the correction amount of the output frequency is a representation of the variation △ fout relationship variation △ P LO and the inverter output frequency of the active power supplied from the inverter 1 is there. The positive direction is when active power is flowing from the voltage sag compensator to the AC motor, and the output frequency decreases in accordance with the increase in active power. On the other hand, when active power is flowing from the AC motor to the voltage sag compensator, the output frequency is increased.

出力周波数制御部１３は、出力有効電力の演算値が０のときには、出力周波数は瞬低前の系統周波数、または設定された固定の周波数である既定周波数の指令値信号を、図示省略されたゲート制御回路に出力してインバータ１の出力周波数を制御する。また、出力有効電力PLOが上昇して＋△PLO1に変動したとすると、出力周波数制御部１３は、出力周波数を−△ｆout下げた周波数指令値ｆ0−△ｆoutをゲート制御回路に出力する。逆に、出力有効電力PLOが降下して−△PLO1に変動したとすると、出力周波数制御部１３は、出力周波数を＋△ｆout上げた周波数指令値ｆ0＋△ｆoutをゲート制御回路に出力する。
ここで、図２における出力有効電力値０時における既定の出力周波数、および出力有効電力値と出力周波数の関係を示す傾きは、負荷となる交流モータの特性を勘案して所定の値に設定される。 When the calculated value of the output active power is 0, the output frequency control unit 13 outputs a command value signal of a predetermined frequency that is a system frequency before the instantaneous drop or a fixed frequency that is set to a gate that is not illustrated. Output to the control circuit to control the output frequency of the inverter 1. Also, assuming that the output active power PLO increases and fluctuates to + ΔPLO1 , the output frequency control unit 13 outputs the frequency command value f 0 -Δfout obtained by lowering the output frequency by −Δfout to the gate control circuit. To do. On the other hand, if the output active power PLO drops to fluctuate to -ΔPLO1 , the output frequency control unit 13 uses the frequency command value f 0 + Δfout obtained by raising the output frequency by + Δfout to the gate control circuit. Output.
Here, the predetermined output frequency at the time when the output active power value is 0 in FIG. 2 and the slope indicating the relationship between the output active power value and the output frequency are set to predetermined values in consideration of the characteristics of the AC motor serving as a load. The

図３は、停電発生から瞬低補償期間における出力周波数ｆの低下状態を示したものであり、また、図４は出力周波数の決定方法を示すフローチャートしである。
出力周波数をｆとすると、定周期毎に演算した出力有効電力PLOに対して偏差を求め、その偏差が正の場合と負の場合に応じてそれぞれ前回値との偏差を求めて出力周波数ｆを増減させる。 FIG. 3 shows a state in which the output frequency f is reduced during the sag compensation period from the occurrence of a power failure, and FIG. 4 is a flowchart showing a method for determining the output frequency.
Assuming that the output frequency is f, a deviation is obtained with respect to the output active power P LO calculated every fixed period, and the deviation from the previous value is obtained depending on whether the deviation is positive or negative, and the output frequency f Increase or decrease.

すなわち、図４において、瞬低が発生して当該周期で求まった有効電力演算値がP0であるとき、ステップＳ１で前回周期に演算された有効電力演算値P0と今回周期での演算値P1との差分をステップＳ２で比較判断し、偏差が出力有効電力の変動分△PLOより大きいときにはステップＳ３で出力周波数を−△ｆout下げた周波数指令値を演算する。また、ステップＳ２で偏差が出力有効電力の変動分△PLOより小さいときにはステップＳ４で出力周波数を＋△ｆout上げた周波数指令値を演算する。ステップＳ５では、演算された出力周波数と出力有効電力演算値を指令値として設定し、ステップＳ１に戻って次回周期の演算を行う。 That is, in FIG. 4, when an instantaneous power drop occurs and the active power calculation value obtained in the period is P 0 , the active power calculation value P 0 calculated in the previous period in step S1 and the calculation value in the current period the difference between P 1 and comparative judgment in step S2, when the deviation is variation △ greater than P LO output active power output frequencies in step S3 - △ fout calculates a frequency command value was lowered. When the deviation is smaller than the fluctuation amount ΔP LO of the output active power in step S2, a frequency command value obtained by raising the output frequency by + Δfout is calculated in step S4. In step S5, the calculated output frequency and output active power calculation value are set as command values, and the process returns to step S1 to calculate the next cycle.

なお、図１で示す実施例では、電力演算部１１は負荷有効電力PLと出力有効電力PLOの演算機能を有しているが、出力有効電力PLOの演算機能のみで交流モータの有効電力・無効電力の急変を抑制し、交流モータの脱調が防止できるものである。更に、電力演算部１１に負荷有効電力PLの演算機能を持たせることで、交流モータに逆起電力が発生しても、瞬低検出が瞬時に可能となる効果が生じるものである。 In the embodiment shown in FIG. 1, the power calculation unit 11 has a calculation function for the load active power P L and the output active power P LO , but the AC motor is effective only by the calculation function for the output active power P LO. It suppresses sudden changes in power and reactive power, and prevents AC motor step-out. Furthermore, by providing a calculation function of the load active power P L to the power calculation unit 11, even if back electromotive force is generated in the AC motor, in which the effect of voltage sag detection is possible instantaneously occurs.

１… インバータ
３… 高速スイッチ
４… 蓄電装置
５… 電力系統
６… 負荷
１０… 制御装置
１１… 電力演算部
１２… 瞬低検出器
１３… 出力周波数制御部 DESCRIPTION OF SYMBOLS 1 ... Inverter 3 ... High-speed switch 4 ... Power storage device 5 ... Electric power system 6 ... Load 10 ... Control apparatus 11 ... Electric power calculation part 12 ... Instantaneous voltage drop detector 13 ... Output frequency control part

Claims (4)

電力系統に高速スイッチを介して定常運転時に力行運転される交流モータを接続し、電力系統の異常を瞬低検出器で検出し、検出した異常検出による信号で高速スイッチをオフにし、蓄電装置及びインバータを介して交流モータに電力を供給する瞬低補償装置において、
前記瞬低補償装置の制御装置は、インバータの出力電圧V0と負荷電流ILから出力有効電力PLOを定周期毎に演算する電力演算部と、
電力演算部が演算した出力有効電力PLOに対応して、正の有効電力に偏差があるときには周波数を下げ、負の有効電力に偏差があるときには周波数を上げる周波数指令値を演算する出力周波数演算部と、
を備えたことを特徴とする瞬低補償装置。 An AC motor that is powered by power during steady operation is connected to the power system through a high-speed switch, an abnormality in the power system is detected by a voltage sag detector, the high-speed switch is turned off by a signal from the detected abnormality, In the voltage sag compensator that supplies power to the AC motor via the inverter,
Said controller sag compensator includes a power calculator for calculating output active power P LO every fixed cycle and the output voltage V 0 which inverter from the load current I L,
Corresponding to the output active power P LO calculated by the power calculation unit, the output frequency calculation calculates the frequency command value that decreases the frequency when there is a deviation in the positive active power and increases the frequency when there is a deviation in the negative active power And
A voltage sag compensator characterized by comprising: 前記電力演算部での出力有効電力PLOの演算は、次式で行うことを特徴とする請求項１記載の瞬低補償装置。
PLO＝（（出力電圧RS相×負荷電流R相）−（出力電圧ST相×負荷電流T相））
×２／√３
ただし、Ｒ，Ｓ，Ｔは、三相電力系統の相、 2. The voltage sag compensator according to claim 1, wherein the calculation of the output active power PLO in the power calculation unit is performed by the following equation.
P LO = ((Output voltage RS phase x Load current R phase)-(Output voltage ST phase x Load current T phase))
× 2 / √3
Where R, S, T are the phases of the three-phase power system, 前記電力演算部は、負荷有効電力PLを演算する機能を備え、演算された負荷有効電力PLを前記瞬低検出器に出力し、瞬低検出器は負荷有効電力PLが予め設定された閾値以下となったとき前記高速スイッチに対するオフ信号として出力することを特徴とする請求項１又は２記載の瞬低補償装置。 The power calculation unit has a function of calculating the load active power P L, and outputs the calculated load active power P L to the voltage sag detector, voltage sag detector load active power P L is set in advance 3. The voltage sag compensator according to claim 1, wherein an off signal is output to the high-speed switch when the threshold value is below a predetermined threshold value. 4. 前記電力演算部による負荷有効電力PLの演算は、次式で行うことを特徴とする請求項３記載の瞬低補償装置。
PL＝（（系統電圧RS相×負荷電流R相）−（系統電圧ST相×負荷電流T相））
×２／√３
ただし、Ｒ，Ｓ，Ｔは、三相電力系統の相、 4. The voltage sag compensator according to claim 3, wherein the calculation of the load active power P L by the power calculation unit is performed by the following equation.
P L = ((system voltage RS phase x load current R phase)-(system voltage ST phase x load current T phase))
× 2 / √3
Where R, S, T are the phases of the three-phase power system,
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JPH01129786A (en) * 1987-11-12 1989-05-23 Fuji Electric Co Ltd Method of controlling induction motor upon momentarily stopping and restarting
JP2009194981A (en) * 2008-02-13 2009-08-27 Meidensha Corp Instantaneous voltage drop compensator
JP2013044676A (en) * 2011-08-25 2013-03-04 Yokogawa Electric Corp Three-phase electric power measuring apparatus

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Publication number Priority date Publication date Assignee Title
JPH01129786A (en) * 1987-11-12 1989-05-23 Fuji Electric Co Ltd Method of controlling induction motor upon momentarily stopping and restarting
JP2009194981A (en) * 2008-02-13 2009-08-27 Meidensha Corp Instantaneous voltage drop compensator
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109672198A (en) * 2018-11-29 2019-04-23 中国电力科学研究院有限公司 A kind of method and device controlling wind storing cogeneration system management of charging and discharging
CN109672198B (en) * 2018-11-29 2021-10-22 中国电力科学研究院有限公司 Method and device for controlling charging and discharging management of wind power storage combined power generation system

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