JP4913849B2 - System-linked inverter device and control method thereof - Google Patents

System-linked inverter device and control method thereof Download PDF

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JP4913849B2
JP4913849B2 JP2009176907A JP2009176907A JP4913849B2 JP 4913849 B2 JP4913849 B2 JP 4913849B2 JP 2009176907 A JP2009176907 A JP 2009176907A JP 2009176907 A JP2009176907 A JP 2009176907A JP 4913849 B2 JP4913849 B2 JP 4913849B2
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circuit
inverter
switch
current
filter capacitor
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JP2011035956A (en
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実 柳沢
小林　　隆
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Sanyo Denki Co Ltd
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Sanyo Denki Co Ltd
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Priority to TW099124919A priority patent/TWI514762B/en
Priority to CN201010241849.XA priority patent/CN101989747B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0064—Magnetic structures combining different functions, e.g. storage, filtering or transformation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Description

本発明は、系統連係インバータ装置及び系統連係インバータ装置の制御方法に関するものである。   The present invention relates to a grid-linked inverter device and a control method for the grid-linked inverter device.

特開平１１−２９８０２８号公報の図１には、太陽電池からなる直流電源１に接続されたインバータ回路が、限流抵抗及び第１の開閉器からなる直列回路と、この直列回路または限流抵抗に並列接続された第２の開閉器とからなる開閉回路を介して電力系統に接続され、インバータ回路と開閉回路との間にインダクタ及びコンデンサを含むフィルタが配置された系統連係インバータ装置が開示されている。 FIG 1 of JP-A-11-298028, JP-inverter circuit connected to a DC power source 1 consisting of solar cell, and a series circuit consisting of current limiting resistor and the first switch, the series circuit or the current limiting Disclosed is a system-linked inverter device that is connected to an electric power system via a switching circuit including a second switch connected in parallel to a resistor, and a filter including an inductor and a capacitor is disposed between the inverter circuit and the switching circuit. Has been.

特開平１１−２９８０２８号公報 図１Japanese Patent Laid-Open No. 11-298028 FIG.

従来の装置では、第１の開閉器をオン状態にした後に、第２の開閉器をオン状態にするときに、フィルタ用コンデンサへ突入電流が流れる。そこで、これを抑えるために限流抵抗の抵抗値を小さくし、コンデンサの充電電圧を高くする必要があった。そのため限流抵抗の損失が大きくなって、大きな電力定格の限流抵抗が必要であった。また大きな電力定格の限流抵抗を用いると、第１の開閉器も電流定格の大きなものが必要となっていた。 In the conventional device, an inrush current flows to the filter capacitor when the second switch is turned on after the first switch is turned on. Therefore, in order to suppress this, it is necessary to reduce the resistance value of the current limiting resistor and increase the charging voltage of the capacitor. Therefore, the loss of the current limiting resistance is increased, and a current limiting resistance having a large power rating is necessary. If a current limiting resistor with a large power rating is used, the first switch must have a large current rating.

本発明の目的は、電力定格の大きな限流抵抗及び電流定格の大きな開閉器を必要としない系統連係インバータ装置及び該装置の制御方法を提供することにある。   An object of the present invention is to provide a system-linked inverter device that does not require a current limiting resistor having a large power rating and a switch having a large current rating, and a control method for the device.

本発明は、直流電源に接続されたインバータ回路が、限流抵抗及び第１の開閉器からなる直列回路と、この直列回路の限流抵抗または該直列回路に並列接続された第２の開閉器とからなる開閉回路を介して電力系統に接続され、インバータ回路と開閉回路との間にフィルタ用コンデンサが配置されている系統連係インバータ装置を改良の対象とする。本発明の装置及び方法においては、インバータ回路を制御する制御回路が、第１の開閉器がオン状態になった後第２の開閉器がオン状態になるまでは、インバータ回路の出力電流がゼロになるように、インバータ回路を制御する。このように第１の開閉器がオン状態になった後第２の開閉器がオン状態になるまで（起動開始期間）は、インバータ回路の出力電流がゼロになるように、インバータ回路を制御すると、第２の開閉器をオン状態にしたときに、フィルタ用コンデンサへ突入電流が流れるのを阻止することができる。その結果、突入電流対策のために、電力定格の大きな限流抵抗を用いたり、電流定格の大きな開閉器を用意する必要がなくなる。 The present invention relates to a series circuit in which an inverter circuit connected to a DC power source includes a current limiting resistor and a first switch, and a current limiting resistor of the series circuit or a second switch connected in parallel to the series circuit . A system-linked inverter device in which a filter capacitor is arranged between the inverter circuit and the switching circuit is an object of improvement. In the apparatus and method of the present invention, the output current of the inverter circuit is zero until the control circuit for controlling the inverter circuit is turned on after the first switch is turned on. The inverter circuit is controlled so that When the inverter circuit is controlled such that the output current of the inverter circuit becomes zero until the second switch is turned on after the first switch is turned on (starting start period) in this way. When the second switch is turned on, the inrush current can be prevented from flowing into the filter capacitor. As a result, there is no need to use a current limiting resistor with a large power rating or to prepare a switch with a large current rating as a countermeasure against inrush current.

前述の起動開始期間において、インバータ回路の出力電流がゼロになるようにするためには、例えば、制御回路をフィルタ用コンデンサと開閉回路との間を流れる出力電流がゼロとなるように、フィードバック制御すればよい。また制御回路で、起動期間において、フィルタ用コンデンサと開閉回路との間を流れる出力電流がゼロとなるように、フィードフォーワード制御してもよい。具体的には、フィルタ用コンデンサの充電電流を含むインバータ電流を流すようにフィードフォーワード制御をすればよい。   In order to make the output current of the inverter circuit zero during the start-up period, for example, feedback control is performed so that the output current flowing between the filter capacitor and the open / close circuit becomes zero. do it. Further, the control circuit may perform feedforward control so that the output current flowing between the filter capacitor and the switching circuit becomes zero during the start-up period. Specifically, feedforward control may be performed so that an inverter current including a charging current for the filter capacitor flows.

フィードバック制御を利用した本発明の系統連係インバータ装置を太陽光発電システムに適用した本発明の第１の実施の形態の基本構成を示す回路図である。It is a circuit diagram which shows the basic composition of the 1st Embodiment of this invention which applied the system | strain connection inverter apparatus of this invention using feedback control to a solar power generation system. 制御回路の構成を示す図である。It is a figure which shows the structure of a control circuit. 動作波形を示す図である。It is a figure which shows an operation | movement waveform. 従来の制御回路の構成を示す図である。It is a figure which shows the structure of the conventional control circuit. 従来の装置の動作波形を示す図である。It is a figure which shows the operation | movement waveform of the conventional apparatus. 本発明の他の実施の形態の構成を示す回路図である。It is a circuit diagram which shows the structure of other embodiment of this invention. 図６の実施の形態で用いることができるゲート信号発生回路の構成を示す図である。It is a figure which shows the structure of the gate signal generation circuit which can be used in embodiment of FIG.

以下、図面を参照して本発明の実施の形態を詳細に説明する。図１は、フィードバック制御を利用した本発明の系統連係インバータ装置を太陽光発電システムに適用した実施の形態の基本構成を示す回路であり、図２は制御回路の構成を示す図である。図１においては、直流電源１は、太陽電池からなる直流電源である。そして直流電源１からの直流電力は、インバータ回路２により交流電力に変換される。インバータ回路２は、一対のトランジスタが直列に接続されてなるトランジスタ直列回路が２つ並列接続され、各トランジスタ直列回路の中間点が交流出力端子となる公知のインバータ回路である。２つのトランジスタ直列回路に含まれる複数のトランジスタは、制御回路１０からインバータ回路２に与えられるゲート信号Ｇ１により、導通が制御される。正常時であれば、直流電源１の直流電力は、インバータ回路２により交流電力に変換されて商用電力系統に供給される。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram showing a basic configuration of an embodiment in which a system linkage inverter device of the present invention using feedback control is applied to a photovoltaic power generation system, and FIG. 2 is a diagram showing a configuration of a control circuit. In FIG. 1, a DC power source 1 is a DC power source composed of a solar battery. The direct current power from the direct current power source 1 is converted into alternating current power by the inverter circuit 2. The inverter circuit 2 comprises a pair of transistors belt transistor series circuit are connected in series are two parallel connections is a known inverter circuit that intermediate point is AC output terminal of each transistor series circuit. The conduction of the plurality of transistors included in the two transistor series circuits is controlled by the gate signal G1 supplied from the control circuit 10 to the inverter circuit 2. When normal, the DC power of the DC power source 1 is converted into AC power by the inverter circuit 2 and supplied to the commercial power system.

インバータ回路２の出力部には、インダクタ４とフィルタ用コンデンサ５とからなるＬＣフィルタ回路が配置されている。インダクタ４は、インバータ回路２の出力に直列接続され、フィルタ用コンデンサ５は、インダクタ４の一端とアース間に接続されている。インダクタ４とフィルタ用コンデンサ５との接続点と商用電力系統９との間には、開閉回路ＳＷが配置されている。開閉回路ＳＷは、限流抵抗７及び第１の開閉器８の直列回路と、該直列回路に並列接続された第２の開閉器６とから構成されている。第１の開閉器８と第２の開閉器６とは、制御回路１０からの制御信号Ａ２及びＡ１によって開閉が制御される。第１及び第２の開閉器は、機械式の開閉器である。インバータ回路２とインダクタ４との間には、インバータ回路２の出力電流を検出する第１の電流検出器３が配置されて、インバータ電流Ｉ１が制御回路１０に入力されている。またインダクタ４とコンデンサ５との接続点からインバータ回路２の出力電圧が検出され、インバータ電圧Ｖ１が制御回路１０に入力されている。 An LC filter circuit including an inductor 4 and a filter capacitor 5 is disposed at the output portion of the inverter circuit 2. The inductor 4 is connected in series to the output of the inverter circuit 2, and the filter capacitor 5 is connected between one end of the inductor 4 and the ground. A switching circuit SW is arranged between the connection point between the inductor 4 and the filter capacitor 5 and the commercial power system 9. The switch circuit SW includes a series circuit of a current limiting resistor 7 and a first switch 8 and a second switch 6 connected in parallel to the series circuit. Opening and closing of the first switch 8 and the second switch 6 is controlled by control signals A2 and A1 from the control circuit 10. The first and second switches are mechanical switches. A first current detector 3 that detects an output current of the inverter circuit 2 is disposed between the inverter circuit 2 and the inductor 4, and the inverter current I 1 is input to the control circuit 10. The output voltage of the inverter circuit 2 is detected from the connection point between the inductor 4 and the capacitor 5, and the inverter voltage V 1 is input to the control circuit 10.

図２は制御回路１０内に構成されたインバータ回路２のゲート信号発生回路ＧＳＣの構成を示している。このゲート信号発生回路ＧＳＣでは、インバータ電圧Ｖ１を９０°進み要素ＡＥを通して位相を９０°進めて、更に振幅調整器ＡＡで振幅を調整することにより、フィルタ用コンデンサ５のコンデンサ電流に相当するコンデンサ電流相当値Ｉｃを作る。そしてインバータ電圧Ｖ１と電流基準Ｉrefとの乗算値に、コンデンサ電流相当値Ｉｃを加算した信号に、インバータ電流Ｉ１を加算して加算信号を作成し、加算信号を増幅器Ａｍｐで増幅した信号をパルス幅変調回路ＰＷＭに入力してインバータゲート信号Ｇ１を作成する。この例では、このようにして作成したインバータゲート信号Ｇ１を用いたフィードフォーワード制御を行う。すなわち本実施の形態では、第１の開閉器８がオン状態になった後第２の開閉器６がオン状態になるまでは、インバータ回路２の出力電流Ｉがゼロになるように（フィルタ用コンデンサ５と開閉回路ＳＷとの間を流れる出力電流Ｉがゼロとなるように）、フィードフォーワード制御をする。図３は、本実施の形態動作波形を示している。図３（５）に示すように、インバータ回路２の出力電流Ｉは、第２の開閉器６がオン状態になるまで０Ａになっている。その結果、フィルタ用コンデンサ５に突入電流が流れることはない。 FIG. 2 shows a configuration of the gate signal generation circuit GSC of the inverter circuit 2 configured in the control circuit 10. In this gate signal generation circuit GSC, the inverter voltage V1 is advanced by 90 °, the phase is advanced by 90 ° through the element AE, and the amplitude is further adjusted by the amplitude adjuster AA, whereby the capacitor current corresponding to the capacitor current of the filter capacitor 5 is obtained. The equivalent value Ic is created. Then, the inverter current I1 is added to the signal obtained by adding the capacitor current equivalent value Ic to the multiplication value of the inverter voltage V1 and the current reference Iref to create an addition signal, and the signal obtained by amplifying the addition signal by the amplifier Amp has a pulse width An inverter gate signal G1 is generated by inputting to the modulation circuit PWM. In this example, feedforward control is performed using the inverter gate signal G1 thus created . That is, in the present embodiment, until the second switch 6 is turned on after the first switch 8 is turned on, the output current I of the inverter circuit 2 becomes zero (filtering Feed forward control is performed so that the output current I flowing between the capacitor 5 and the switching circuit SW becomes zero. FIG. 3 shows operation waveforms of the present embodiment. As shown in FIG. 3 (5), the output current I of the inverter circuit 2 is 0 A until the second switch 6 is turned on. As a result, no inrush current flows through the filter capacitor 5.

図１の装置の制御方法では、まず限流抵抗７が接続された第１の開閉器８をオン状態にした後、インバータ回路２をオン状態（動作状態）にし、インバータ電流がゼロになる（０Ａになる）ようにしてインバータ回路２を起動させる。出力電流を０Ａに制御すると、インバータ電圧Ｖ１は商用電力系統と電圧、位相が等しくなり、その後第２の開閉器６をオン状態にしても突入電流は流れない。また限流抵抗７も第２の開閉器６がオン状態になる前において、電流が０Ａで電力を消費しないため、小さな電力定格の抵抗を限流抵抗７として選定できる。さらに抵抗値を大きくできるため、商用電力系統への影響も無くすことができる。   In the control method of the apparatus of FIG. 1, first, the first switch 8 connected to the current limiting resistor 7 is turned on, then the inverter circuit 2 is turned on (operating state), and the inverter current becomes zero ( Inverter circuit 2 is started up as follows. When the output current is controlled to 0 A, the inverter voltage V1 has the same voltage and phase as those of the commercial power system. After that, even if the second switch 6 is turned on, no inrush current flows. Further, since the current limiting resistor 7 also has a current of 0 A and does not consume power before the second switch 6 is turned on, a resistor having a small power rating can be selected as the current limiting resistor 7. Further, since the resistance value can be increased, the influence on the commercial power system can be eliminated.

図４は従来の系統連係インバータ装置で用いられている制御回路の構成を示している。図４の従来の制御回路を用いると、第１の開閉器８がオン状態になった後第２の開閉器６がオン状態になるまでの間もインバータ電流Ｉ１が流れ続けて、インバータ電圧Ｖ１と商用電力系統の電圧、位相が違っているため、図５（５）に示すように、第２の開閉器６がオン状態になる際に、大きな突入電流Ｉが流れている。 FIG. 4 shows a configuration of a control circuit used in a conventional grid-connected inverter device. Using conventional control circuit of Figure 4, the first switch 8 is a second switch 6 after the ON state is continued even inverter current I 1 flows until turned on, the inverter voltage Since the voltage and phase of V1 and the commercial power system are different, as shown in FIG. 5 (5), a large inrush current I flows when the second switch 6 is turned on.

図６は、フィルタ用コンデンサ５と開閉回路ＳＷとの間を流れる出力電流Ｉｏがゼロとなるようにフィードバック制御をする、本発明の系統連係インバータ装置の他の実施の形態の構成を示しており、図７はこの実施の形態のゲート信号発生回路ＧＳＣの構成を示している。図６及び図７においては、図１及び図２に示した実施の形態と同じ構成には、図１及び図２に付した符号と同じ符号を付して説明を省略する。本実施の形態では、インダクタ４とフィルタ用コンデンサ５との接続点と開閉回路ＳＷとの間に、インバータ回路２の出力電流を検出する第２の電流検出器１１が設けられている。第２の電流検出器１１が検出する出力電流Ｉｏを見ると、フィルタ用コンデンサ５に電流が流れているか否かの判定ができる。そこで図７のゲート信号発生回路ＧＳＣでは、フィルタ用コンデンサ５と開閉回路ＳＷ（第１の開閉器８）との間を流れる出力電流Ｉｏがゼロとなるように、出力電流Ｉｏをフィードバックする。そこで図７のゲート信号発生回路ＧＳＣでは、出力電流Ｉｏと出力電流基準（＝０）との差分を増幅器Ａｍｐ′で増幅した値を、インバータ電圧Ｖ１と電流基準Ｉrefとの乗算値にインバータ電流Ｉ１を加算した値に加算した値を増幅器Ａｍｐに入力する。このようにすると、フィルタ用コンデンサ５と開閉回路ＳＷ（第１の開閉器８）との間を流れる出力電流Ｉｏがゼロとなるようにフィードバック制御をすることができる。なお開閉器６を投入した後は、電流を系統に流すことになるので、フィードバック回路を切り離すか、増幅器Ａｍｐ′のゲインを０にしておけばよい。本実施の形態を用いても先の実施例と同様に［図３（５）の信号と同様に］、突入電流の発生を防止することができる。 FIG. 6 shows the configuration of another embodiment of the system-linked inverter device of the present invention that performs feedback control so that the output current Io flowing between the filter capacitor 5 and the switching circuit SW becomes zero. FIG. 7 shows the configuration of the gate signal generation circuit GSC of this embodiment. 6 and 7, the same components as those in the embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals as those in FIGS. 1 and 2, and the description thereof is omitted. In the present embodiment, a second current detector 11 that detects the output current of the inverter circuit 2 is provided between the connection point between the inductor 4 and the filter capacitor 5 and the switching circuit SW. Looking at the output current Io second current detector 11 detects, it is determined whether or not a current flows into the filter capacitor 5. Therefore, in the gate signal generation circuit GSC of FIG. 7, the output current Io is fed back so that the output current Io flowing between the filter capacitor 5 and the switch circuit SW (first switch 8) becomes zero. Therefore, in the gate signal generating circuit GSC of FIG. 7, the value obtained by amplifying the difference between the output current Io and the output current reference (= 0) by the amplifier Amp ′ is multiplied by the product of the inverter voltage V1 and the current reference Iref to the inverter current I1. Is added to the amplifier Amp. In this way, feedback control can be performed so that the output current Io flowing between the filter capacitor 5 and the switch circuit SW (first switch 8) becomes zero. Since the current flows through the system after the switch 6 is turned on, the feedback circuit may be disconnected or the gain of the amplifier Amp ′ may be set to zero. Even if this embodiment is used, the inrush current can be prevented in the same manner as in the previous example [similar to the signal in FIG. 3 (5)].

上記実施の形態では、限流抵抗７と第１の開閉器８から構成される直列回路に対して第２の開閉器６を並列接続しているが、本発明は、限流抵抗７に対して第２の開閉器６を並列接続する場合にも、当然にして適用することができるのは勿論である。 In the above embodiment, the second switch 6 is connected in parallel to the series circuit composed of the current limiting resistor 7 and the first switch 8. Of course, the present invention can be applied to the case where the second switch 6 is connected in parallel.

本発明によれば、第１の開閉器がオン状態になった後第２の開閉器がオン状態になるまでは、インバータ回路の出力電流がゼロになるように、インバータ回路を制御するため、第２の開閉器をオン状態にしたときに、フィルタ用コンデンサに突入電流が流れるのを阻止することができる。その結果、突入電流対策のために、電力定格の大きな限流抵抗を用いたり、電流定格の大きな開閉器を用意する必要がなくなる。   According to the present invention, the inverter circuit is controlled so that the output current of the inverter circuit becomes zero until the second switch is turned on after the first switch is turned on. When the second switch is turned on, an inrush current can be prevented from flowing through the filter capacitor. As a result, there is no need to use a current limiting resistor with a large power rating or to prepare a switch with a large current rating as a countermeasure against inrush current.

１ 直流電源
２ インバータ回路
３ 第１の電流検出器
４ インダクタ
５ フィルタ用コンデンサ
６ 第２の開閉器
７ 限流抵抗
８ 第１の開閉器
９ 商用電力系統
１０ 制御回路
１１ 第２の電流検出器 DESCRIPTION OF SYMBOLS 1 DC power supply 2 Inverter circuit 3 1st current detector 4 Inductor 5 Filter capacitor 6 2nd switch 7 Current limiting resistance 8 1st switch 9 Commercial power system 10 Control circuit
11 Second current detector

Claims (7)

直流電源に接続されたインバータ回路が、限流抵抗及び第１の開閉器から構成される直列回路と、該直列回路の前記限流抵抗または該直列回路に並列接続された第２の開閉器とからなる開閉回路を介して電力系統に接続され、
前記インバータ回路と前記開閉回路との間にフィルタ用コンデンサが配置されている系統連係インバータ装置であって、
前記インバータ回路を制御する制御回路は、前記第１の開閉器がオン状態になった後前記第２の開閉器がオン状態になるまでは、前記インバータ回路の出力電流がゼロになるように、前記インバータ回路を制御することを特徴とする系統連係インバータ装置。 Inverter circuit connected to a DC power source, a series circuit composed of current limiting resistor and a first switch, a second switch connected in parallel with the current limiting resistor or the series circuit of the series circuit Connected to the power system through a switching circuit consisting of
A grid-linked inverter device in which a filter capacitor is disposed between the inverter circuit and the switching circuit,
The control circuit for controlling the inverter circuit is configured such that the output current of the inverter circuit becomes zero until the second switch is turned on after the first switch is turned on. A grid-linked inverter device that controls the inverter circuit. 前記制御回路は、前記フィルタ用コンデンサと前記開閉回路との間を流れる前記出力電流がゼロとなるように、フィードバック制御することを特徴とする請求項１に記載の系統連係インバータ装置。   2. The system linkage inverter apparatus according to claim 1, wherein the control circuit performs feedback control so that the output current flowing between the filter capacitor and the switching circuit becomes zero. 前記制御回路は、前記フィルタ用コンデンサと前記開閉回路との間を流れる前記出力電流がゼロとなるように、フィードフォーワード制御することを特徴とする請求項１に記載の系統連係インバータ装置。   2. The system linkage inverter apparatus according to claim 1, wherein the control circuit performs feedforward control so that the output current flowing between the filter capacitor and the switching circuit becomes zero. 前記フィルタ用コンデンサの充電電流を含むインバータ電流を流すように前記フィードフォーワード制御をすることを特徴とする請求項３に記載の系統連係インバータ装置。   The system-linked inverter device according to claim 3, wherein the feedforward control is performed so that an inverter current including a charging current of the filter capacitor flows. 直流電源に接続されたインバータ回路が、限流抵抗及び第１の開閉器から構成される直列回路と、該直列回路の前記限流抵抗または該直列回路に並列接続された第２の開閉器とからなる開閉回路を介して電力系統に接続され、
前記インバータ回路と前記開閉回路との間にフィルタ用コンデンサが配置されている系統連係インバータ装置の制御方法であって、
前記第１の開閉器がオン状態になった後前記第２の開閉器がオン状態になるまでは、前記インバータ回路の出力電流がゼロになるように、前記インバータ回路を制御することを特徴とする系統連係インバータ装置の制御方法。 Inverter circuit connected to a DC power source, a series circuit composed of current limiting resistor and a first switch, a second switch connected in parallel with the current limiting resistor or the series circuit of the series circuit Connected to the power system through a switching circuit consisting of
A control method for a grid-linked inverter device in which a filter capacitor is disposed between the inverter circuit and the switching circuit,
Until said first switch is the second switch after the ON state is turned on, as the output current of the inverter circuit becomes zero, and wherein the controller controls the inverter circuit To control the grid-linked inverter device. 前記フィルタ用コンデンサと前記開閉回路との間を流れる前記出力電流がゼロとなるように、フィードバック制御することを特徴とする請求項５に記載の系統連係インバータ装置の制御方法。   6. The control method for a grid-linked inverter device according to claim 5, wherein feedback control is performed so that the output current flowing between the filter capacitor and the switching circuit becomes zero. 前記フィルタ用コンデンサと前記開閉回路との間を流れる前記出力電流がゼロとなるように、フィードフォーワード制御することを特徴とする請求項５に記載の系統連係インバータ装置の制御方法。   6. The control method for a grid-linked inverter device according to claim 5, wherein feedforward control is performed so that the output current flowing between the filter capacitor and the switching circuit becomes zero.
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