JP2008054395A - Single operation detector - Google Patents

Single operation detector Download PDF

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JP2008054395A
JP2008054395A JP2006226762A JP2006226762A JP2008054395A JP 2008054395 A JP2008054395 A JP 2008054395A JP 2006226762 A JP2006226762 A JP 2006226762A JP 2006226762 A JP2006226762 A JP 2006226762A JP 2008054395 A JP2008054395 A JP 2008054395A
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output current
reactive power
output
circuit
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JP4735473B2 (en
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Masao Mabuchi
雅夫 馬渕
Kazuyoshi Imamura
和由 今村
Yasuhiro Tsubota
康弘 坪田
Shinichi Hosomi
伸一 細見
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Omron Corp
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Omron Tateisi Electronics Co
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    • 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
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E40/30—Reactive power compensation

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a single operation detector which can improve the power factor of an inverter circuit. <P>SOLUTION: The single operation detector 5 is provided, between a distributed power supply 2 and a commercial system 3, with an inverter circuit 11 for injecting the output current of reactive power; a filter circuit 12 for cutting the high-frequency components from the output current; a circuit 14 for detecting single operation, based on the variations in the injected reactive power; a section 30 for calculating the reactive energy of a desired output current; and an output current control section 31 performing drive control of the inverter circuit, in order to deliver an output current based on the reactive energy thus calculated. The single operation detector 5 is further provided with a correction gain section 28 for calculating the amount of inrush current flowing to a capacitor 12B, based on the system frequency and the voltage value of system voltage, and the capacitance of the capacitor and then delivering the reactive energy of the amount of the inrush current. The output current control section adds the reactive energy of the amount of inrush current and the reactive energy of the amount of the current that should be output and then performs drive control of the inverter circuit to deliver the output current, based on the addition result. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、例えば分散型電源及び商用系統間に、無効電力に相当する出力電流を注入出力するインバータ回路と、このインバータ回路にて注入した前記無効電力の周波数変動に基づき、前記分散型電源の単独運転を検出する単独運転検出回路とを有する単独運転検出装置に関する。   The present invention provides an inverter circuit that injects and outputs an output current corresponding to reactive power between, for example, a distributed power source and a commercial system, and a frequency variation of the reactive power injected by the inverter circuit. The present invention relates to an isolated operation detection device having an isolated operation detection circuit for detecting an isolated operation.

従来、このような単独運転検出装置としては、分散型電源及び商用系統間に、無効電力に相当する出力電流を注入出力するインバータ回路と、このインバータ回路のインバータ出力波形に、分散型電源の単独運転時に出力周波数に変動が生じる歪を与え、この歪で生じる周波数変動、若しくは周波数変動に起因する変動を検出し、分散型電源の単独運転を検出する単独運転検出回路とを備えた技術が広く知られている（例えば特許文献１参照）。   Conventionally, such an isolated operation detection device includes an inverter circuit that injects and outputs an output current corresponding to reactive power between a distributed power source and a commercial system, and an inverter output waveform of the inverter circuit, A wide variety of technologies are equipped with an isolated operation detection circuit that applies a distortion that causes fluctuations in the output frequency during operation, detects frequency fluctuations caused by this distortion, or fluctuations caused by the frequency fluctuations, and detects isolated operation of the distributed power supply. It is known (for example, see Patent Document 1).

また、特許文献１の単独運転検出装置によれば、リアクトル及びコンデンサで構成するフィルタ回路をインバータ回路の出力側に配置し、このフィルタ回路は、インバータ回路の出力電流から高周波成分を除去することができる。
特開平９−３２２５５４号公報（段落番号「００４３」及び図１参照） Moreover, according to the isolated operation detection device of Patent Document 1, a filter circuit constituted by a reactor and a capacitor is arranged on the output side of the inverter circuit, and this filter circuit can remove a high-frequency component from the output current of the inverter circuit. it can.
JP 9-322554 A (see paragraph number “0043” and FIG. 1)

しかしながら、特許文献１の単独運転検出装置によれば、図４に示すようにインバータ回路５１の無効電力に相当する出力電流からフィルタ回路５２を通じて高周波成分を除去し、高周波成分を除去した出力電流を単独運転検出装置の出力電流Ｉｏとして出力するものであるが、インバータ回路５１の出力電流量Ｉｓはフィルタ回路５２内部のコンデンサ５２Ａに流入した流入電流量Ｉｃを差し引いた出力電流量（Ｉｓ−Ｉｃ）が単独運転検出装置の出力電流Ｉｏとなるため、インバータ回路５１の力率は０．８５を満たない場合も考えられる。   However, according to the isolated operation detection device of Patent Document 1, as shown in FIG. 4, the high-frequency component is removed from the output current corresponding to the reactive power of the inverter circuit 51 through the filter circuit 52 and the high-frequency component is removed. Although the output current Io of the isolated operation detection device is output, the output current amount Is of the inverter circuit 51 is the output current amount (Is−Ic) obtained by subtracting the inflow current amount Ic flowing into the capacitor 52A in the filter circuit 52. Becomes the output current Io of the isolated operation detection device, and the power factor of the inverter circuit 51 may be less than 0.85.

本発明は上記点に鑑みてなされたものであり、その目的とするところは、インバータ回路の力率を改善することができる単独運転検出装置を提供することにある。   This invention is made | formed in view of the said point, The place made into the objective is to provide the independent operation detection apparatus which can improve the power factor of an inverter circuit.

上記目的を達成するために本発明の単独運転検出装置は、分散型電源及び商用系統間に、無効電力に相当する出力電流を注入出力するインバータ回路と、このインバータ回路の出力電流から高周波成分をカットするフィルタ回路と、前記分散型電源及び商用系統間に注入された前記無効電力の周波数変動に基づき、前記分散型電源の単独運転を検出する単独運転検出回路と、前記無効電力の周波数変動に基づき、所望出力電流量を出力するために所望出力電流量に相当する無効電力量を算出する無効電力量算出回路と、この無効電力量算出回路にて算出した前記無効電力量に基づき、前記所望出力電流量を出力すべく、前記インバータ回路を駆動制御する出力電流制御回路とを有する単独運転検出装置であって、前記インバータ回路の出力電流の内、前記フィルタ回路内部のコンデンサに流入する流入電流量を検出する流入電流検出手段と、この流入電流検出手段にて検出した前記流入電流量に対応した無効電力量を、前記単独運転検出装置として出力すべき、前記所望出力電流量に相当する無効電力量に加算する無効電力量加算手段とを有し、前記出力電流制御回路は、前記単独運転検出装置として前記所望出力電流量を出力するために、前記無効電力量加算手段の加算結果に相当する無効電力量に基づき出力電流を出力すべく、前記インバータ回路を駆動制御するようにした。   In order to achieve the above object, an isolated operation detection device of the present invention includes an inverter circuit that injects and outputs an output current corresponding to reactive power between a distributed power source and a commercial system, and a high-frequency component from the output current of the inverter circuit. A filter circuit for cutting, an isolated operation detection circuit for detecting isolated operation of the distributed power source based on a frequency variation of the reactive power injected between the distributed power source and a commercial system, and a frequency variation of the reactive power Based on the reactive power amount calculated by the reactive power amount calculating circuit, the reactive power amount calculating circuit for calculating the reactive power amount corresponding to the desired output current amount to output the desired output current amount An independent operation detection device having an output current control circuit for driving and controlling the inverter circuit to output an output current amount, wherein the output current of the inverter circuit is Inflow current detection means for detecting the amount of inflow current flowing into the capacitor in the filter circuit, and the reactive power amount corresponding to the amount of inflow current detected by the inflow current detection means Reactive power amount adding means for adding to the reactive power amount corresponding to the desired output current amount, and the output current control circuit outputs the desired output current amount as the isolated operation detection device Therefore, the inverter circuit is driven and controlled to output an output current based on the reactive power amount corresponding to the addition result of the reactive power amount adding means.

従って、本発明の単独運転検出装置によれば、前記インバータ回路の出力電流の内、コンデンサに流入する流入電流量を検出し、前記単独運転検出装置として出力する前記所望出力電流量に相当する無効電力量に、前記流入電流量に相当する無効電力量を加算し、この加算結果の無効電力量に基づき、出力電流を出力すべく、前記インバータ回路を駆動制御するようにしたので、前記インバータ回路の出力電流の一部が前記コンデンサに流入したとしても、前記単独運転検出装置として所望出力電流を出力することができるため、インバータ回路の出力電流の力率を改善することができる。   Therefore, according to the isolated operation detection device of the present invention, the inflow current amount flowing into the capacitor among the output currents of the inverter circuit is detected, and the invalidity corresponding to the desired output current amount output as the isolated operation detection device. Since the reactive power amount corresponding to the inflow current amount is added to the power amount, and the inverter circuit is driven and controlled to output an output current based on the reactive power amount of the addition result, the inverter circuit Even if a part of the output current flows into the capacitor, since the desired output current can be output as the isolated operation detection device, the power factor of the output current of the inverter circuit can be improved.

また、本発明の単独運転検出装置の前記流入電流検出手段は、前記商用系統の系統電圧に関わる系統周波数を計測する周波数計測手段と、前記商用系統の系統電圧に関わる電圧値を計測する電圧計測手段と、前記周波数計測手段にて計測した系統周波数、前記電圧計測手段にて計測した電圧値及び前記コンデンサの静電容量に基づき、前記コンデンサに流入する流入電流量を算出する流入電流量算出手段とを有するようにしても良い。   Further, the inflow current detection means of the isolated operation detection device of the present invention includes a frequency measurement means for measuring a system frequency related to the system voltage of the commercial system, and a voltage measurement for measuring a voltage value related to the system voltage of the commercial system. And an inflow current amount calculation means for calculating an inflow current amount flowing into the capacitor based on a system frequency measured by the frequency measurement means, a voltage value measured by the voltage measurement means, and a capacitance of the capacitor You may make it have.

従って、本発明の単独運転検出装置によれば、前記系統電圧に関わる系統周波数、前記系統電圧に関わる電圧値、前記コンデンサの静電容量に基づき、前記コンデンサに流入する流入電流量を算出することができる。   Therefore, according to the isolated operation detection device of the present invention, the amount of inflow current flowing into the capacitor is calculated based on the system frequency related to the system voltage, the voltage value related to the system voltage, and the capacitance of the capacitor. Can do.

上記のように構成された本発明の単独運転検出装置によれば、前記インバータ回路の出力電流の内、コンデンサに流入する流入電流量を検出し、前記単独運転検出装置として出力する前記所望出力電流量に相当する無効電力量に、前記流入電流量に相当する無効電力量を加算し、この加算結果の無効電力量に基づき、出力電流を出力すべく、前記インバータ回路を駆動制御するようにしたので、前記インバータ回路の出力電流の一部が前記コンデンサに流入したとしても、前記単独運転検出装置として所望出力電流を出力することができるため、インバータ回路の出力電流の力率を改善することができる。   According to the isolated operation detection device of the present invention configured as described above, the desired output current that is detected as the isolated operation detection device by detecting the amount of inflow current flowing into the capacitor from the output current of the inverter circuit. A reactive power amount corresponding to the inflow current amount is added to a reactive power amount corresponding to the amount, and the inverter circuit is driven and controlled to output an output current based on the reactive power amount of the addition result. Therefore, even if a part of the output current of the inverter circuit flows into the capacitor, the desired output current can be output as the isolated operation detection device, so that the power factor of the output current of the inverter circuit can be improved. it can.

以下、図面に基づいて本発明の単独運転検出装置の実施の形態を示す分散型電源システムについて説明する。図１は本実施の形態を示す分散型電源システム内部の概略構成を示すブロック図である。   Hereinafter, a distributed power supply system showing an embodiment of an isolated operation detection device of the present invention will be described based on the drawings. FIG. 1 is a block diagram showing a schematic configuration inside a distributed power supply system according to the present embodiment.

図１に示す分散型電源システム１は、直流電力を発電する、例えば太陽光発電機やガスエンジン発電機等の分散型電源２と、この分散型電源２と連系接続する商用系統３と、分散型電源２及び商用系統３間に配置され、電力変換機能を備えたパワーコンディショナ装置４と、パワーコンディショナ装置４及び商用系統３間に配置され、商用系統３停電時の分散型電源２の単独運転を検出する単独運転検出装置５とを有し、パワーコンディショナ装置４は、電力変換機能を通じて、分散型電源２にて発電した直流電力を商用系統３の交流電力に変換し、この変換した交流電力を一般家電機器等の負荷６に供給するものである。   A distributed power system 1 shown in FIG. 1 generates direct-current power, for example, a distributed power source 2 such as a solar power generator or a gas engine generator, and a commercial system 3 connected to the distributed power source 2. A power conditioner device 4 disposed between the distributed power source 2 and the commercial system 3 and having a power conversion function, and a distributed power source 2 disposed between the power conditioner device 4 and the commercial system 3 when a power failure occurs in the commercial system 3. The power conditioner device 4 converts the DC power generated by the distributed power source 2 into the AC power of the commercial system 3 through the power conversion function. The converted AC power is supplied to a load 6 such as a general household electrical appliance.

単独運転検出装置５は、分散型電源２及び商用系統３間に無効電力を注入するインバータ回路１１と、インバータ回路１１からの無効電力の高周波成分をカットするフィルタ回路１２と、商用系統３の系統電圧を検出する電圧検出回路１３と、電圧検出回路１３を通じてインバータ回路１１で注入した無効電力の周波数変動を分散型電源２及び商用系統３間で検出し、この周波数変動に基づき、商用系統３停電時の分散型電源２の単独運転を検出する単独運転検出回路１４と、分散型電源２及び商用系統３間で検出した無効電力の周波数変動に基づき、インバータ回路１１の無効電力の注入量（無効電力量）を算出し、この算出した注入量に基づきインバータ回路１１を駆動制御するインバータ駆動制御回路１５と、分散型電源２及び商用系統３間の連系接続を遮断する連系リレー回路１６と、分散型電源２及び商用系統３間のライン及びインバータ回路１１間の接続を遮断するリレー回路１７と、この単独運転検出装置５全体を制御する制御回路１８とを有している。   The isolated operation detection device 5 includes an inverter circuit 11 that injects reactive power between the distributed power source 2 and the commercial system 3, a filter circuit 12 that cuts high-frequency components of reactive power from the inverter circuit 11, and a system of the commercial system 3. A voltage detection circuit 13 for detecting the voltage, and a frequency fluctuation of the reactive power injected by the inverter circuit 11 through the voltage detection circuit 13 is detected between the distributed power source 2 and the commercial system 3, and based on this frequency fluctuation, a commercial system 3 power failure Independent operation injection circuit (invalid amount of reactive power) of inverter circuit 11 based on frequency variation of reactive power detected between distributed power source 2 and commercial system 3 The inverter drive control circuit 15 for controlling the inverter circuit 11 based on the calculated injection amount, the distributed power source 2 and the commercial system. An interconnection relay circuit 16 that cuts off the interconnection between the three, a line between the distributed power source 2 and the commercial system 3, and a relay circuit 17 that cuts off the connection between the inverter circuit 11 and the entire independent operation detection device 5 And a control circuit 18 for controlling.

フィルタ回路１２は、リアクトル１２Ａ及びコンデンサ１２Ｂで構成し、インバータ回路１１で注入した無効電力の高周波成分をカットするものである。   The filter circuit 12 includes a reactor 12A and a capacitor 12B, and cuts high frequency components of reactive power injected by the inverter circuit 11.

インバータ駆動制御回路１５は、電圧検出回路１３を通じて検出した系統電圧から商用系統３の系統周波数を計測周期単位で順次計測する周波数計測部２１と、この周波数計測部２１にて順次計測した計測周期単位の系統周波数に基づき、連続した所定移動平均時間分の系統周波数の移動平均値を順次算出する移動平均値算出部２２と、この移動平均値算出部２２にて移動平均値を順次記憶する移動平均値記憶部２３と、この移動平均値記憶部２３に記憶中の最新の移動平均値及び、この最新の移動平均値から所定時間前の過去の移動平均値を読み出し、これら読み出した最新の移動平均値及び過去の移動平均値の偏差量を計測周期単位の系統周期毎に算出する偏差量算出部２４と、この偏差量算出部２４にて算出した偏差量をゲイン調整するゲイン部２５と、ゲイン調整した偏差量を所定入力範囲に抑制するリミッタ部２６と、電圧検出回路１３を通じて系統電圧の電圧値を順次計測する電圧計測部２７と、この電圧計測部２７にて順次計測した電圧計測値及び周波数計測部２１にて順次計測した系統周波数に基づき、フィルタ回路１２内部のコンデンサ１２Ｂに流入する流入電流量を算出し、この算出した流入電流量に相当する無効電力量を出力する補正ゲイン部２８と、リミッタ部２６で抑制した偏差量に基づき、定期変動部２９からの定期無効電力量を補正すると共に、この補正した定期無効電力量に補正ゲイン部２８からの無効電力量を加算し、この加算結果をインバータ回路１１で出力する無効電力の出力電流量に相当する無効電力量として算出する無効電力量演算部３０と、この無効電力量演算部３０にて算出した無効電力量に基づき、無効電力に相当する出力電流を出力すべく、インバータ回路１１を駆動制御する出力電流制御部３１とを有している。   The inverter drive control circuit 15 includes a frequency measurement unit 21 that sequentially measures the system frequency of the commercial system 3 in units of measurement cycles from the system voltage detected through the voltage detection circuit 13, and a measurement cycle unit that is sequentially measured by the frequency measurement unit 21. Based on the system frequency, a moving average value calculating unit 22 that sequentially calculates a moving average value of system frequencies for a predetermined predetermined moving average time, and a moving average that sequentially stores the moving average value in the moving average value calculating unit 22 The value storage unit 23, the latest moving average value stored in the moving average value storage unit 23, and the past moving average value a predetermined time ago from the latest moving average value are read out, and the read out latest moving average A deviation amount calculation unit 24 that calculates a deviation amount between the value and the past moving average value for each system cycle in a measurement cycle unit, and gain adjustment is performed on the deviation amount calculated by the deviation amount calculation unit 24 The gain unit 25, the limiter unit 26 that suppresses the gain adjusted deviation amount within a predetermined input range, the voltage measurement unit 27 that sequentially measures the voltage value of the system voltage through the voltage detection circuit 13, and the voltage measurement unit 27 sequentially. Based on the measured voltage measurement value and the system frequency sequentially measured by the frequency measurement unit 21, the amount of inflow current flowing into the capacitor 12B in the filter circuit 12 is calculated, and the reactive power amount corresponding to the calculated amount of inflow current is calculated. The periodic reactive power amount from the periodic variation unit 29 is corrected based on the correction gain unit 28 to be output and the deviation amount suppressed by the limiter unit 26, and the reactive power from the correction gain unit 28 is corrected to the corrected periodic reactive power amount. A reactive power amount calculation unit that calculates the reactive power amount corresponding to the output current amount of the reactive power output by the inverter circuit 11 0 and an output current control unit 31 that drives and controls the inverter circuit 11 to output an output current corresponding to the reactive power based on the reactive power calculated by the reactive power calculation unit 30. .

周波数計測部２１は、電圧検出回路１３を通じて系統電圧から商用系統３の系統周波数を計測周期単位、例えば５ｍ秒単位で順次計測するものである。尚、商用系統３の系統周波数を５０Ｈｚ（１系統周期は２０ｍ秒）とした場合、その計測周期単位は、商用系統３の系統周期の１／３以下、例えば５ｍ秒単位にすることが望ましい。   The frequency measurement unit 21 sequentially measures the system frequency of the commercial system 3 from the system voltage through the voltage detection circuit 13 in a measurement cycle unit, for example, 5 msec unit. In addition, when the system frequency of the commercial system 3 is 50 Hz (one system period is 20 milliseconds), the measurement period unit is desirably 1/3 or less of the system period of the commercial system 3, for example, 5 milliseconds unit.

移動平均値算出部２２は、周波数計測部２１にて順次計測した５ｍ秒単位の系統周波数に基づき、連続した所定移動平均時間分、例えば４０ｍ秒分の系統周波数の移動平均値を順次算出するものである。尚、所定移動平均時間は、系統周期の一周期、例えば２０ｍ秒よりも長く、かつ所望する検出速度、例えば１００ｍ秒よりもできるだけ短い時間を条件とするため、例えば４０ｍ秒にすることが望ましい。   The moving average value calculating unit 22 sequentially calculates the moving average value of the system frequency for a predetermined predetermined moving average time, for example, 40 msec, based on the system frequency in units of 5 msec sequentially measured by the frequency measuring unit 21. It is. The predetermined moving average time is preferably set to 40 ms, for example, because it is longer than one cycle of the system cycle, for example, 20 ms and as short as possible for a desired detection speed, for example, 100 ms.

偏差量算出部２４は、移動平均値記憶部２３に記憶中の最新の移動平均値及び、この最新の移動平均値から所定時間前、例えば２００ｍ秒前の過去の移動平均値を読み出し、これら読み出した最新の移動平均値及び過去の移動平均値の偏差量を５ｍ秒単位の系統周期毎に算出するものである。尚、所定時間前の過去の移動平均値は、所望する検出速度、例えば１００ｍ秒よりも長く、かつできるだけ短い期間を条件とするため、例えば２００ｍ秒にすることが望ましい。   The deviation amount calculation unit 24 reads out the latest moving average value stored in the moving average value storage unit 23 and the past moving average value of a predetermined time before, for example, 200 msec from the latest moving average value. The deviation amount between the latest moving average value and the past moving average value is calculated for each system cycle in units of 5 milliseconds. Note that the past moving average value before the predetermined time is preferably set to, for example, 200 milliseconds because it is longer than the desired detection speed, for example, 100 milliseconds and is as short as possible.

補正ゲイン部２８は、周波数計測部２１にて順次計測した系統周波数ｆと、電圧計測部２７にて順次計測した電圧値Ｖと、コンデンサ１２Ｂの静電容量Ｃとに基づき、Ｖ＊２πｆｃの数式でコンデンサ１２Ｂに流入する流入電流量Ｉｃを算出し、この算出した流入電流量に相当する無効電力量を出力するものである。   The correction gain unit 28 is based on the system frequency f sequentially measured by the frequency measurement unit 21, the voltage value V sequentially measured by the voltage measurement unit 27, and the capacitance C of the capacitor 12B, and a formula of V * 2πfc. Then, an inflow current amount Ic flowing into the capacitor 12B is calculated, and a reactive power amount corresponding to the calculated inflow current amount is output.

無効電力量演算部３０は、リミッタ部２６で抑制した偏差量に基づき、定期変動部２９からの定期無効電力量を補正すると共に、この補正した定期無効電力量に補正ゲイン部２８の流入電流量に相当する無効電力量を加算し、この加算結果の無効電力量を出力電流制御部３１に通知するものである。   The reactive power amount calculation unit 30 corrects the periodic reactive power amount from the periodic variation unit 29 based on the deviation amount suppressed by the limiter unit 26, and the amount of inflow current of the correction gain unit 28 to the corrected periodic reactive power amount. The reactive power amount corresponding to is added, and the reactive power amount as a result of the addition is notified to the output current control unit 31.

出力電流制御部３１は、無効電力量演算部３０にて算出した無効電力量に基づき、インバータ回路１１から出力電流を出力すべく、インバータ回路１１を駆動制御するものである。その結果、インバータ回路１１は、出力電流制御部３１の駆動制御に応じて、無効電力量演算部３０にて算出した無効電力量に相当する出力電流を出力することになる。この際、インバータ回路１１が出力する出力電流量Ｉｓは、図２に示すように、単独運転検出装置５として出力する出力電流量Ｉｏと、コンデンサ１２Ｂに流入する流入電流量Ｉｃとの和となる。そして、単独運転検出装置５では、コンデンサ１２Ｂの流入電流量Ｉｃを差し引いた所望出力電流が出力電流Ｉｏとして出力されることになる。   The output current control unit 31 drives and controls the inverter circuit 11 to output an output current from the inverter circuit 11 based on the reactive power amount calculated by the reactive power amount calculation unit 30. As a result, the inverter circuit 11 outputs an output current corresponding to the reactive power amount calculated by the reactive power amount calculation unit 30 in accordance with the drive control of the output current control unit 31. At this time, the output current amount Is output from the inverter circuit 11 is the sum of the output current amount Io output as the isolated operation detection device 5 and the inflow current amount Ic flowing into the capacitor 12B, as shown in FIG. . In the isolated operation detection device 5, the desired output current obtained by subtracting the inflow current amount Ic of the capacitor 12B is output as the output current Io.

単独運転検出装置５の制御回路１８は、単独運転検出回路１４を通じて分散型電源２の単独運転を検出すると、連系リレー回路１６を通じて、分散型電源２及び商用系統３間の連系接続を遮断すると共に、リレー回路１７を通じて、分散型電源２及び商用系統３間のライン及び、インバータ回路１１間の接続を遮断するものである。   When the control circuit 18 of the isolated operation detection device 5 detects the isolated operation of the distributed power supply 2 through the isolated operation detection circuit 14, the connected connection between the distributed power supply 2 and the commercial system 3 is cut off through the connected relay circuit 16. At the same time, the connection between the distributed power source 2 and the commercial system 3 and the inverter circuit 11 is cut off through the relay circuit 17.

尚、請求項記載の単独運転検出装置は単独運転検出装置５、分散型電源は分散型電源２、商用系統は商用系統３、インバータ回路はインバータ回路１１、フィルタ回路はフィルタ回路１２、コンデンサはコンデンサ１２Ｂ、単独運転検出回路は単独運転検出回路１４、無効電力量算出回路は無効電力量演算部３０、出力電流制御回路は出力電流制御部３１、流入電流検出手段は周波数計測部２１、電圧計測部２７及び補正ゲイン部２８、無効電力量加算手段は補正ゲイン部２８及び無効電力量演算部３０、周波数計測手段は周波数計測部２１、電圧計測手段は電圧計測部２７、流入電流量算出手段は補正ゲイン部２８に相当するものである。   The isolated operation detection device according to the claims is the isolated operation detection device 5, the distributed power supply is the distributed power supply 2, the commercial system is the commercial system 3, the inverter circuit is the inverter circuit 11, the filter circuit is the filter circuit 12, and the capacitor is the capacitor. 12B, the isolated operation detection circuit is the isolated operation detection circuit 14, the reactive energy calculation circuit is the reactive energy calculation unit 30, the output current control circuit is the output current control unit 31, the inflow current detection means is the frequency measurement unit 21, and the voltage measurement unit. 27, the correction gain section 28, the reactive power amount adding means is the correction gain section 28 and the reactive power amount calculating section 30, the frequency measuring means is the frequency measuring section 21, the voltage measuring means is the voltage measuring section 27, and the inflow current amount calculating means is the correction. This corresponds to the gain unit 28.

次に本実施の形態を示す分散型電源システム１の動作について説明する。図３は本実施の形態に関わる単独運転検出装置５の出力電流制御処理に関わるインバータ駆動制御部１５内部の処理動作を示すフローチャートである。   Next, the operation of the distributed power supply system 1 showing this embodiment will be described. FIG. 3 is a flowchart showing the processing operation inside the inverter drive control unit 15 related to the output current control processing of the isolated operation detection device 5 according to the present embodiment.

図３に示す出力電流制御処理とは、単独運転検出装置５から所望出力電流Ｉｏを出力する場合、この所望出力電流量Ｉｏにフィルタ回路１２内のコンデンサ１２Ｂに流入する流入電流量Ｉｃを加算した出力電流量Ｉｓに相当する出力電流を出力するようにインバータ回路１１を駆動制御することでインバータ回路１１の出力電流の力率を、例えば０．８５以上に改善する処理である。   In the output current control process shown in FIG. 3, when the desired output current Io is output from the isolated operation detection device 5, the inflow current amount Ic flowing into the capacitor 12B in the filter circuit 12 is added to the desired output current amount Io. This is a process for improving the power factor of the output current of the inverter circuit 11 to, for example, 0.85 or more by driving and controlling the inverter circuit 11 so as to output an output current corresponding to the output current amount Is.

図３においてインバータ駆動制御部１５内部の周波数計測部２１は、電圧検出回路１３を通じて商用系統３の系統電圧を検出すると、この系統電圧の系統周波数ｆを計測する（ステップＳ１１）。   In FIG. 3, when the frequency measurement unit 21 in the inverter drive control unit 15 detects the system voltage of the commercial system 3 through the voltage detection circuit 13, the system 15 measures the system frequency f of the system voltage (step S11).

さらに、電圧計測部２７は、電圧検出回路１３を通じて商用系統３の系統電圧を検出すると、この系統電圧の電圧値Ｖを計測する（ステップＳ１２）。   Further, when the voltage measuring unit 27 detects the system voltage of the commercial system 3 through the voltage detection circuit 13, the voltage measuring unit 27 measures the voltage value V of the system voltage (step S12).

補正ゲイン部２８は、ステップＳ１１にて計測した系統電圧の系統周波数ｆ、ステップＳ１２にて計測した系統電圧の電圧値Ｖ、フィルタ回路１２内のコンデンサ１２Ｂの静電容量Ｃに基づき、フィルタ回路１２Ｂ内のコンデンサ１２Ｂに流入する流入電流量Ｉｃを算出する（ステップＳ１３）。尚、補正ゲイン部２８では、Ｖ＊２πｆＣの数式に基づき、コンデンサ１２Ｂに流入する流入電流量Ｉｃを算出するものである。   Based on the system frequency f of the system voltage measured in step S11, the voltage value V of the system voltage measured in step S12, and the electrostatic capacitance C of the capacitor 12B in the filter circuit 12, the correction gain unit 28 performs the filter circuit 12B. The inflow current amount Ic flowing into the capacitor 12B is calculated (step S13). The correction gain unit 28 calculates the inflow current amount Ic flowing into the capacitor 12B based on the formula V * 2πfC.

補正ゲイン部２８は、コンデンサ１２Ｂの流入電流量Ｉｃを算出すると、この流入電流量Ｉｃに相当する無効電力量を無効電力量演算部３０に通知する（ステップＳ１４）。   After calculating the inflow current amount Ic of the capacitor 12B, the correction gain unit 28 notifies the reactive power amount calculation unit 30 of the reactive power amount corresponding to the inflow current amount Ic (step S14).

無効電力量演算部３０は、リミッタ部２６で抑制した偏差量に基づき、定期変動部２９からの定期無効電力量を補正し、この補正した定期無効電力量、すなわち単独運転検出装置５として出力すべき所望出力電流量Ｉｏに相当する無効電力量に補正ゲイン部２８で取得したコンデンサ１２Ｂの流入電流量Ｉｃに相当する無効電力量を加算し（ステップＳ１５）、この加算結果の無効電力量を出力電流制御部３１に通知する（ステップＳ１６）。   The reactive power amount calculation unit 30 corrects the periodic reactive power amount from the periodic fluctuation unit 29 based on the deviation amount suppressed by the limiter unit 26 and outputs the corrected periodic reactive power amount, that is, the isolated operation detection device 5. The reactive power amount corresponding to the inflow current amount Ic of the capacitor 12B acquired by the correction gain unit 28 is added to the reactive power amount corresponding to the desired output current amount Io (step S15), and the reactive power amount of the addition result is output. The current control unit 31 is notified (step S16).

出力電流制御部３１は、加算結果の無効電力量に相当する出力電流量をインバータ回路１１から出力すべく、このインバータ回路１１を駆動制御することで（ステップＳ１７）、この処理動作を終了する。   The output current control unit 31 drives and controls the inverter circuit 11 so as to output the output current amount corresponding to the reactive power amount as a result of the addition from the inverter circuit 11 (step S17), and ends this processing operation.

インバータ回路１１は、単独運転検出装置５として所望出力電流量Ｉｏを出力する場合、所望出力電流量Ｉｏにコンデンサ１２Ｂ内に流入する流入電流量Ｉｃを加算した出力電流量Ｉｓを出力することになる。その結果、インバータ回路１１は、その出力電流量Ｉｓの一部がコンデンサ１２Ｂに流入したとしても、単独運転検出装置５として出力すべき出力電流量Ｉｏを出力することができるため、インバータ回路１１の力率を０．８５以上に改善することができる。   When the inverter circuit 11 outputs the desired output current amount Io as the isolated operation detection device 5, the inverter circuit 11 outputs the output current amount Is obtained by adding the inflow current amount Ic flowing into the capacitor 12B to the desired output current amount Io. . As a result, the inverter circuit 11 can output the output current amount Io to be output as the isolated operation detection device 5 even if a part of the output current amount Is flows into the capacitor 12B. The power factor can be improved to 0.85 or more.

本実施の形態によれば、インバータ回路１１の出力電流の内、フィルタ回路１２内部のコンデンサ１２Ｂに流入する流入電流量Ｉｃを算出し、この流入電流量Ｉｃに対応した無効電力量を、単独運転検出装置５として出力すべき所望出力電流量Ｉｏに相当する無効電力量に加算し、この加算結果の無効電力量に基づき出力電流量Ｉｓを出力すべく、インバータ回路１１を駆動制御するようにしたので、インバータ回路１１の出力電流量Ｉｓの一部がコンデンサ１２Ｂに流入したとしても、単独運転検出装置５として出力すべき所望出力電流量Ｉｏを出力することができるため、インバータ回路１１の出力電流の力率を改善、例えば０．８５以上にすることができる。   According to the present embodiment, the inflow current amount Ic flowing into the capacitor 12B in the filter circuit 12 among the output current of the inverter circuit 11 is calculated, and the reactive power amount corresponding to the inflow current amount Ic is calculated as an independent operation. The inverter circuit 11 is driven and controlled to add the reactive power amount corresponding to the desired output current amount Io to be output as the detection device 5 and to output the output current amount Is based on the reactive power amount of the addition result. Therefore, even if a part of the output current amount Is of the inverter circuit 11 flows into the capacitor 12B, the desired output current amount Io to be output as the isolated operation detection device 5 can be output. The power factor can be improved, for example, 0.85 or more.

本発明の単独運転検出装置によれば、インバータ回路の出力電流の内、コンデンサに流入する流入電流量を検出し、単独運転検出装置として出力する所望出力電流量に相当する無効電力量に、流入電流量に相当する無効電力量を加算し、この加算結果の無効電力量に基づき、出力電流を出力すべく、インバータ回路を駆動制御するようにしたので、インバータ回路の出力電流の一部が前記コンデンサに流入したとしても、前記単独運転検出装置として所望出力電流を出力することができるため、インバータ回路の出力電流の力率を改善することができるため、例えば分散型電源及び商用系統間を連系接続する分散型電源システムに有用である。   According to the isolated operation detection device of the present invention, the amount of inflow current flowing into the capacitor is detected from the output current of the inverter circuit, and the amount of reactive current corresponding to the desired output current amount output as the isolated operation detection device is Since the reactive power amount corresponding to the current amount is added, and the inverter circuit is driven and controlled to output the output current based on the reactive power amount of the addition result, a part of the output current of the inverter circuit is Even if it flows into the capacitor, since the desired output current can be output as the isolated operation detecting device, the power factor of the output current of the inverter circuit can be improved. For example, the distributed power source and the commercial system are connected. This is useful for distributed power systems that are connected to each other.

本発明の単独運転検出装置に関わる実施の形態を示す分散型電源システム内部の概略構成を示すブロック図である。It is a block diagram which shows schematic structure inside the distributed power supply system which shows embodiment in connection with the isolated operation detection apparatus of this invention. 本実施の形態に関わる単独運転検出装置内部のインバータ回路の出力電流の流れを端的に示す説明図である。It is explanatory drawing which shows directly the flow of the output current of the inverter circuit inside the independent operation detection apparatus in connection with this Embodiment. 本実施の形態に関わる単独運転検出装置の出力電流制御処理に関わるインバータ駆動制御部内部の処理動作を示すフローチャートである。It is a flowchart which shows the processing operation inside the inverter drive control part in connection with the output current control process of the isolated operation detection apparatus in connection with this Embodiment. 従来の単独運転検出装置内部のインバータ回路の出力電流の流れを端的に示す説明図である。It is explanatory drawing which shows directly the flow of the output current of the inverter circuit inside the conventional independent operation detection apparatus.

符号の説明Explanation of symbols

２ 分散型電源
３ 商用系統
５ 単独運転検出装置
１１ インバータ回路
１２ フィルタ回路
１２Ｂ コンデンサ
１４ 単独運転検出回路
２１ 周波数計測部（流入電流検出手段）
２７ 電圧計測部（流入電流検出手段）
２８ 補正ゲイン部（無効電力量加算手段、流入電流検出手段及び流入電流量算出手段）
３０ 無効電力量演算部（無効電力量算出回路及び無効電力量加算手段）
３１ 出力電流制御部（出力電流制御回路）


DESCRIPTION OF SYMBOLS 2 Distributed type power supply 3 Commercial system 5 Independent operation detection apparatus 11 Inverter circuit 12 Filter circuit 12B Capacitor 14 Independent operation detection circuit 21 Frequency measurement part (inflow current detection means)
27 Voltage measurement unit (inflow current detection means)
28 correction gain section (reactive power amount adding means, inflow current detecting means, inflow current amount calculating means)
30 Reactive energy calculation unit (reactive energy calculation circuit and reactive energy addition means)
31 Output current control unit (Output current control circuit)


Claims (2)

分散型電源及び商用系統間に、無効電力に相当する出力電流を注入出力するインバータ回路と、このインバータ回路の出力電流から高周波成分をカットするフィルタ回路と、前記分散型電源及び商用系統間に注入された前記無効電力の周波数変動に基づき、前記分散型電源の単独運転を検出する単独運転検出回路と、前記無効電力の周波数変動に基づき、所望出力電流量を出力するために所望出力電流量に相当する無効電力量を算出する無効電力量算出回路と、この無効電力量算出回路にて算出した前記無効電力量に基づき、前記所望出力電流量を出力すべく、前記インバータ回路を駆動制御する出力電流制御回路とを有する単独運転検出装置であって、
前記インバータ回路の出力電流の内、前記フィルタ回路内部のコンデンサに流入する流入電流量を検出する流入電流検出手段と、
この流入電流検出手段にて検出した前記流入電流量に対応した無効電力量を、前記単独運転検出装置として出力すべき、前記所望出力電流量に相当する無効電力量に加算する無効電力量加算手段とを有し、
前記出力電流制御回路は、
前記単独運転検出装置として前記所望出力電流量を出力するために、前記無効電力量加算手段の加算結果に相当する無効電力量に基づき出力電流を出力すべく、前記インバータ回路を駆動制御することを特徴とする単独運転検出装置。 An inverter circuit that injects and outputs an output current corresponding to reactive power between the distributed power source and the commercial system, a filter circuit that cuts high frequency components from the output current of the inverter circuit, and an injection between the distributed power source and the commercial system An isolated operation detection circuit that detects isolated operation of the distributed power source based on the frequency variation of the reactive power, and a desired output current amount to output a desired output current amount based on the frequency variation of the reactive power. Reactive power amount calculation circuit for calculating the corresponding reactive power amount, and output for driving and controlling the inverter circuit to output the desired output current amount based on the reactive power amount calculated by the reactive power amount calculation circuit A single operation detection device having a current control circuit,
Inflow current detection means for detecting the amount of inflow current flowing into the capacitor in the filter circuit among the output current of the inverter circuit,
Reactive power amount adding means for adding the reactive power amount corresponding to the inflow current amount detected by the inflow current detecting means to the reactive power amount corresponding to the desired output current amount to be output as the isolated operation detecting device. And
The output current control circuit is
In order to output the desired output current amount as the isolated operation detection device, drive control of the inverter circuit is performed to output an output current based on the reactive power amount corresponding to the addition result of the reactive power amount adding means. An isolated operation detection device. 前記流入電流検出手段は、
前記商用系統の系統電圧に関わる系統周波数を計測する周波数計測手段と、
前記商用系統の系統電圧に関わる電圧値を計測する電圧計測手段と、
前記周波数計測手段にて計測した系統周波数、前記電圧計測手段にて計測した電圧値及び前記コンデンサの静電容量に基づき、前記コンデンサに流入する流入電流量を算出する流入電流量算出手段とを有することを特徴とする請求項１記載の単独運転検出装置。

The inflow current detection means includes
Frequency measuring means for measuring a system frequency related to a system voltage of the commercial system;
Voltage measuring means for measuring a voltage value related to a system voltage of the commercial system;
An inflow current amount calculation means for calculating an inflow current amount flowing into the capacitor based on a system frequency measured by the frequency measurement means, a voltage value measured by the voltage measurement means, and a capacitance of the capacitor; The isolated operation detection device according to claim 1.

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011188690A (en) * 2010-03-10 2011-09-22 Toshiba It & Control Systems Corp Islanding detection device of inverter and method of detecting islanding
JP2012044815A (en) * 2010-08-20 2012-03-01 Toshiba Corp Individual operation detector and individual operation detection method
CN104052070A (en) * 2014-07-02 2014-09-17 上海雷诺尔电力自动化有限公司 Dynamic active filter compensation device
WO2014171043A1 (en) * 2013-04-15 2014-10-23 オムロン株式会社 Control device, power conditioner, dispersed power source system, program, and control method
WO2014171044A1 (en) * 2013-04-15 2014-10-23 オムロン株式会社 Control device, power conditioner, dispersed power source system, program, and control method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0923584A (en) * 1995-07-05 1997-01-21 Shinko Electric Co Ltd Filter compensating circuit and reactive power compensating apparatus
JPH09322554A (en) * 1996-05-29 1997-12-12 Sharp Corp Detection method of single operation of inverter and inverter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0923584A (en) * 1995-07-05 1997-01-21 Shinko Electric Co Ltd Filter compensating circuit and reactive power compensating apparatus
JPH09322554A (en) * 1996-05-29 1997-12-12 Sharp Corp Detection method of single operation of inverter and inverter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011188690A (en) * 2010-03-10 2011-09-22 Toshiba It & Control Systems Corp Islanding detection device of inverter and method of detecting islanding
JP2012044815A (en) * 2010-08-20 2012-03-01 Toshiba Corp Individual operation detector and individual operation detection method
WO2014171043A1 (en) * 2013-04-15 2014-10-23 オムロン株式会社 Control device, power conditioner, dispersed power source system, program, and control method
WO2014171044A1 (en) * 2013-04-15 2014-10-23 オムロン株式会社 Control device, power conditioner, dispersed power source system, program, and control method
JP2014207808A (en) * 2013-04-15 2014-10-30 オムロン株式会社 Control device, power conditioner, dispersed power source system, program and control method
JP2014207811A (en) * 2013-04-15 2014-10-30 オムロン株式会社 Control device, power conditioner, dispersed power source system, program and control method
CN104052070A (en) * 2014-07-02 2014-09-17 上海雷诺尔电力自动化有限公司 Dynamic active filter compensation device

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