JP2000020150A - Solar power generation inverter device - Google Patents
Solar power generation inverter deviceInfo
- Publication number
- JP2000020150A JP2000020150A JP10184406A JP18440698A JP2000020150A JP 2000020150 A JP2000020150 A JP 2000020150A JP 10184406 A JP10184406 A JP 10184406A JP 18440698 A JP18440698 A JP 18440698A JP 2000020150 A JP2000020150 A JP 2000020150A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- power
- output
- solar cell
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
- Photovoltaic Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、太陽電池の出力を
直流電源回路を介して異なる直流電圧に変換し、その直
流電圧をインバータ回路を用いて交流電圧に変換する太
陽光発電インバータ装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photovoltaic power inverter which converts the output of a solar cell into a different DC voltage via a DC power supply circuit, and converts the DC voltage into an AC voltage using an inverter circuit.
【０００２】[0002]
【発明が解決しようとする課題】この種の太陽光発電イ
ンバータ装置の系統連系時における構成の一例を図３に
示す。この図３において、太陽光発電インバータ装置１
は、太陽電池２、昇圧チョッパ回路として構成された直
流電源回路３、単相のインバータ回路４、ＬＣ形のフィ
ルタ回路５、ブレーカ６、及び制御回路７から構成され
ている。また、電圧検出器８、９、１０及び電流検出器
１１、１２が設けられており、夫々太陽電池２の出力電
圧値ＶD1、直流電源回路３の出力電圧値ＶD2、交流電圧
ＶAC、太陽電池２の出力電流値ＩD1、交流電流ＩACを検
出するようになっている。太陽電池２からの出力電圧
は、直流電源回路３により昇圧された後インバータ回路
４によってＰＷＭ波形を持つ交流電圧に変換され、フィ
ルタ回路５を通して正弦波状電圧とされた後、ブレーカ
６を介して電力系統である交流電源１３に連系可能とな
っている。FIG. 3 shows an example of a configuration of this type of photovoltaic power generation inverter device at the time of system interconnection. In FIG. 3, the solar power inverter 1
Comprises a solar cell 2, a DC power supply circuit 3 configured as a boost chopper circuit, a single-phase inverter circuit 4, an LC-type filter circuit 5, a breaker 6, and a control circuit 7. Further, voltage detectors 8, 9, and 10 and current detectors 11 and 12 are provided, and the output voltage value VD1 of the solar cell 2, the output voltage value VD2 of the DC power supply circuit 3, the AC voltage VAC, and the Output current value ID1 and the alternating current IAC. The output voltage from the solar cell 2 is boosted by the DC power supply circuit 3, is converted into an AC voltage having a PWM waveform by the inverter circuit 4, is converted into a sine wave voltage through the filter circuit 5, and is output through the breaker 6. It can be connected to an AC power supply 13 which is a system.
【０００３】制御回路７は、直流電源回路３を制御する
直流電源制御回路１４と、インバータ回路４を制御する
インバータ制御回路１５とから構成されている。直流電
源制御回路１４は、電力検出回路１６において太陽電池
２の出力電力を演算し、最大電力点検出回路１７におい
て太陽電池２が最大電力を出力する基準電圧値ＶD1*を
求める。直流電源制御回路１４は、基準電圧値ＶD1* と
出力電圧値ＶD1との差分を減算回路１８により求め、制
御器１９により基準電流値ＩD1* を得た後、さらにその
基準電流値ＩD1* と出力電流値ＩD1との差分を減算回路
２０により求め、制御器２１に入力してＰＷＭ回路２２
の変調信号を生成する。ＰＷＭ回路２２は、この変調信
号に従って直流電源回路３のスイッチング素子（図示せ
ず）をオンオフ制御する。The control circuit 7 includes a DC power supply control circuit 14 for controlling the DC power supply circuit 3 and an inverter control circuit 15 for controlling the inverter circuit 4. The DC power supply control circuit 14 calculates the output power of the solar cell 2 in the power detection circuit 16, and obtains the reference voltage value VD1 * at which the solar cell 2 outputs the maximum power in the maximum power point detection circuit 17. The DC power supply control circuit 14 obtains a difference between the reference voltage value VD1 * and the output voltage value VD1 by the subtraction circuit 18, obtains the reference current value ID1 * by the controller 19, and further obtains the reference current value ID1 * and the output. The difference between the current value ID1 and the current value ID1 is obtained by the subtraction circuit 20, and is input to the controller 21 to be input to the PWM circuit 22.
Is generated. The PWM circuit 22 controls on / off of a switching element (not shown) of the DC power supply circuit 3 according to the modulation signal.
【０００４】さらに、直流電源制御回路１４は、直流電
源回路３の出力電圧値ＶD2と制限電圧値ＶD2L*との差分
を減算回路２３により求め、制御器２４を介してオフ回
路２５に入力する。オフ回路２５は、ＶD2L*＜ＶD2とな
ったときにＰＷＭ回路２２をオフさせるように機能す
る。Further, the DC power supply control circuit 14 obtains a difference between the output voltage value VD2 of the DC power supply circuit 3 and the limit voltage value VD2L * by a subtraction circuit 23, and inputs the difference to a OFF circuit 25 via a controller 24. The OFF circuit 25 functions to turn off the PWM circuit 22 when VD2L * <VD2.
【０００５】一方、インバータ制御回路１５は、直流電
源回路３の出力電圧値ＶD2と基準電圧値ＶD2* との差分
を減算回路２６により求めて制御器２７に入力し、除算
回路２８において、制御器２７の出力を電圧値検出回路
２９により求めた交流電圧の実効値で割ることにより基
準交流電流ＩAC* の実効値（振幅）を得る。乗算回路３
０は、この実効値と、力率調整回路３１及び正弦波発生
回路３２から得られる正弦波信号（位相）とを掛け合わ
せて基準交流電流ＩAC* を出力する。インバータ制御回
路１５は、基準交流電流ＩAC* と交流電流ＩACとの差分
を減算回路３３により求め、制御器３４に入力してＰＷ
Ｍ回路３５の変調信号を生成する。ＰＷＭ回路３５は、
この変調信号に従ってインバータ回路４の各スイッチン
グ素子（図示せず）をオンオフ制御する。On the other hand, the inverter control circuit 15 obtains the difference between the output voltage value VD2 of the DC power supply circuit 3 and the reference voltage value VD2 * by a subtraction circuit 26 and inputs the difference to a controller 27. The output of 27 is divided by the effective value of the AC voltage obtained by the voltage value detection circuit 29 to obtain the effective value (amplitude) of the reference AC current IAC *. Multiplication circuit 3
0 multiplies the effective value by a sine wave signal (phase) obtained from the power factor adjustment circuit 31 and the sine wave generation circuit 32 to output a reference AC current IAC *. The inverter control circuit 15 obtains the difference between the reference AC current IAC * and the AC current IAC by the subtraction circuit 33, inputs the difference to the controller 34,
A modulation signal of the M circuit 35 is generated. The PWM circuit 35 is
Each switching element (not shown) of the inverter circuit 4 is turned on / off in accordance with the modulation signal.
【０００６】上述の系統連系時の構成に対し、自立運転
時においては制御回路７は図４に示す構成をとる。即
ち、直流電源制御回路１４は、最大電力点追従制御では
なく直流電源回路３の定電圧出力制御を行い、制御器１
９には直流電源回路３の出力電圧値ＶD2と基準電圧値Ｖ
D2* との差分が入力される。また、インバータ制御回路
１５も定電圧出力制御を行い、制御器３４には電圧基準
発生回路３６から出力される基準交流電圧ＶAC* と交流
電圧ＶACとの差分が入力される。[0006] In contrast to the above-described configuration at the time of system interconnection, the control circuit 7 has the configuration shown in FIG. That is, the DC power supply control circuit 14 performs the constant voltage output control of the DC power supply circuit 3 instead of the maximum power point tracking control.
Reference numeral 9 denotes an output voltage value VD2 of the DC power supply circuit 3 and a reference voltage value V
The difference from D2 * is input. The inverter control circuit 15 also performs constant voltage output control, and the controller 34 receives the difference between the reference AC voltage VAC * output from the voltage reference generation circuit 36 and the AC voltage VAC.
【０００７】さらに、系統連系運転中において、雨の日
や朝夕など太陽電池２の出力が低下したときには、制御
回路７は図５に示す構成をとる。この低出力連系運転に
おいては、直流電源制御回路１４は自立運転と同様に定
電圧出力制御を行う。また、インバータ制御回路１５
は、インバータ回路４に対し定電流出力制御を行い、制
御器３４には、電流基準発生回路３７から出力される基
準交流電流ＩAC* と交流電流ＩACとの差分が入力される
ようになっている。Further, when the output of the solar cell 2 is reduced during a grid connection operation, such as on a rainy day or in the morning and evening, the control circuit 7 has the configuration shown in FIG. In this low output interconnection operation, the DC power supply control circuit 14 performs constant voltage output control as in the self-sustaining operation. In addition, the inverter control circuit 15
Performs constant current output control on the inverter circuit 4, and the controller 34 receives the difference between the reference AC current IAC * output from the current reference generation circuit 37 and the AC current IAC. .
【０００８】以上の構成によれば、直流電源制御回路１
４は、低出力運転時を除く系統連系時においては、太陽
電池２が最大電力を出力可能なようにその動作点を制御
し、低出力連系運転時及び自立運転時においては、直流
電源回路３の出力電圧を定電圧制御する。一方、インバ
ータ制御回路１５は、低出力運転時を除く系統連系時に
おいては、直流電源回路３の出力電圧を定電圧制御する
ことによって太陽電池２の出力電力に等しい電力を系統
に対して出力するよう制御し、低出力連系運転時には定
格電流の数％程度の一定電流を系統に対して出力するよ
う制御し、さらに自立運転時においては、インバータ回
路４の交流電圧を定電圧に制御する。According to the above configuration, the DC power supply control circuit 1
4 controls the operating point of the solar cell 2 so that the solar cell 2 can output the maximum power during the grid connection except during the low-output operation. The output voltage of the circuit 3 is controlled at a constant voltage. On the other hand, the inverter control circuit 15 outputs a power equal to the output power of the solar cell 2 to the grid by controlling the output voltage of the DC power supply circuit 3 at a constant voltage during the grid connection except for the low output operation. Control to output a constant current of about several percent of the rated current to the system during low-output interconnection operation, and to control the AC voltage of the inverter circuit 4 to a constant voltage during independent operation. .
【０００９】しかしながら、上記太陽光発電インバータ
装置１については、以下に述べる３つの問題が存在す
る。第１の問題は、例えば雲の流れが速い日など日照が
ある程度周期的に変化すると、系統連系運転中において
太陽電池２が安定して最大電力を出力できなくなる現象
の発生である。即ち、日照変化により太陽電池２の出力
電力が急変すると、太陽電池２から直流電源回路３に送
られる電力もそれに追従して変化するが、インバータ制
御回路１５によるインバータ回路４の制御には遅れが存
在するので、太陽電池２から直流電源回路３への送出電
力とインバータ回路４から系統への送出電力とがバラン
スできず、本来基準電圧値ＶD2* に定電圧制御されるべ
き直流電源回路３の出力電圧値ＶD2が大きく変動する。
その結果、オフ回路２５が動作して直流電源回路３の制
御が不連続となり、太陽電池２の最大電力点追従制御が
不安定或いは不可能となる場合があった。However, the photovoltaic power generation inverter device 1 has the following three problems. The first problem is that when the sunshine changes periodically to some extent, for example, when the cloud flow is fast, the phenomenon that the solar cell 2 cannot stably output the maximum power during the system interconnection operation occurs. That is, when the output power of the solar cell 2 changes abruptly due to a change in sunlight, the power transmitted from the solar cell 2 to the DC power supply circuit 3 changes accordingly, but the control of the inverter circuit 4 by the inverter control circuit 15 has a delay. Therefore, the power transmitted from the solar cell 2 to the DC power supply circuit 3 and the power transmitted from the inverter circuit 4 to the system cannot be balanced, and the DC power supply circuit 3 which should be constant-voltage controlled to the reference voltage value VD2 * The output voltage value VD2 fluctuates greatly.
As a result, the off-circuit 25 operates and the control of the DC power supply circuit 3 becomes discontinuous, and the maximum power point tracking control of the solar cell 2 may become unstable or impossible.
【００１０】第２の問題は、自立運転時において、太陽
電池２の出力可能な最大電力のうち１／３〜１／５程度
の電力しか利用することができないことである。一般
に、太陽電池２は図６に示す出力特性を有しており、図
中のＡ2 点において最大電力を得ることができる。自立
運転時においては、直流電源制御回路１４は、この太陽
電池２の出力特性とは無関係に直流電源回路３の出力電
圧ＶD2を定電圧に制御するので、インバータ回路４の負
荷が増加して図６に示すＡ2 点を一瞬でも越えてしまう
と、太陽電池２の出力が急減しそのまま運転停止に至っ
てしまう。従って、自立運転時においては、このＡ2 点
における最大電力に対し十分な余裕を持った電力でしか
安定運転することができず、利用効率が著しく低下す
る。A second problem is that only about 1/3 to 1/5 of the maximum output power of the solar cell 2 can be used during the self-sustaining operation. Generally, the solar cell 2 has the output characteristics shown in FIG. 6, and the maximum power can be obtained at the point A2 in the figure. During the self-sustaining operation, the DC power supply control circuit 14 controls the output voltage VD2 of the DC power supply circuit 3 to a constant voltage irrespective of the output characteristics of the solar cell 2, so that the load on the inverter circuit 4 increases. When the point A2 shown in FIG. 6 is exceeded even for a moment, the output of the solar cell 2 suddenly decreases and the operation is stopped as it is. Therefore, at the time of the self-sustaining operation, stable operation can be performed only with electric power having a sufficient margin with respect to the maximum electric power at the point A2, and the use efficiency is significantly reduced.
【００１１】第３の問題は、雨の日や朝夕など太陽電池
２の出力が低下したときにも、太陽電池２の出力可能な
最大電力のうち１／３〜１／５程度の電力しか利用する
ことができないことである。即ち、こうした出力の低下
時には最大電力点追従制御が不安定となるので、制御回
路７は系統に対し一定電力を出力する低出力連系運転に
切り換える。その結果、自立運転時と同様に、太陽電池
２の出力特性とは無関係に直流電源回路３の定電圧出力
制御が行われるので、図６に示すＡ2 点に対して余裕を
持った小電力領域でしか安定運転できなくなる。曇天の
多い日本では、この低出力連系運転における利用効率の
低下が特に問題となる。The third problem is that even when the output of the solar cell 2 is reduced on a rainy day or in the morning and evening, only about 1/3 to 1/5 of the maximum output power of the solar cell 2 is used. That is not possible. That is, since the maximum power point follow-up control becomes unstable when the output decreases, the control circuit 7 switches to a low output interconnection operation that outputs constant power to the system. As a result, the constant voltage output control of the DC power supply circuit 3 is performed irrespective of the output characteristics of the solar cell 2 as in the case of the self-sustained operation. Can only be operated stably. In Japan where there is a lot of cloudy weather, the reduction of the utilization efficiency in the low-power interconnection operation is particularly problematic.
【００１２】本発明は、上記事情に鑑みてなされたもの
で、その第１の目的は、日照変化が大きい場合であって
も安定して最大電力点追従制御を行うことができる太陽
光発電インバータ装置を提供することにあり、第２の目
的は、自立運転時及び低出力連系運転時においても電力
の利用効率が高い太陽光発電インバータ装置を提供する
ことにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a first object of the present invention is to provide a photovoltaic power generation inverter capable of stably performing maximum power point tracking control even when sunshine changes greatly. A second object of the present invention is to provide a photovoltaic power generation inverter device having a high power use efficiency even in the self-sustaining operation and the low output interconnection operation.
【００１３】[0013]
【課題を解決するための手段】上記目的を達成するた
め、本発明の太陽光発電インバータ装置は、太陽電池
と、この太陽電池の出力電圧レベルを変換する直流電源
回路と、この直流電源回路の出力電圧を交流電圧に変換
するインバータ回路と、前記太陽電池の出力電力を前記
インバータ回路の交流出力電力に変換するように前記直
流電源回路及びインバータ回路を制御する制御手段とを
備えた太陽光発電インバータ装置において、前記制御手
段は、前記太陽電池の出力電圧値と当該太陽電池に対す
る所定の基準電圧値との電圧偏差に基づいて当該太陽電
池に対する基準電流値を求めるとともに、前記直流電源
回路の出力電圧値と当該直流電源回路に対する所定の制
限電圧値との電圧偏差に基づいて前記基準電流値を制限
し、この制限された基準電流値と前記太陽電池の出力電
流値が一致するように前記直流電源回路を制御するよう
に構成する（請求項１）。In order to achieve the above object, a photovoltaic power generation inverter device according to the present invention comprises a solar cell, a DC power supply circuit for converting the output voltage level of the solar cell, and a DC power supply circuit. A photovoltaic power generation comprising: an inverter circuit that converts an output voltage to an AC voltage; and a control unit that controls the DC power supply circuit and the inverter circuit so as to convert the output power of the solar cell to the AC output power of the inverter circuit. In the inverter device, the control unit obtains a reference current value for the solar cell based on a voltage deviation between an output voltage value of the solar cell and a predetermined reference voltage value for the solar cell, and outputs an output of the DC power supply circuit. Limiting the reference current value based on a voltage deviation between a voltage value and a predetermined limit voltage value for the DC power supply circuit; Current value and output current value of the solar cell is arranged to control the DC power supply circuit to match (claim 1).
【００１４】この構成によれば、制御手段は、太陽電池
の出力電流を制御するマイナーループを備え、この出力
電流の制御を介して太陽電池の出力電圧を制御すること
になる。その結果、太陽電池の出力電圧値及び出力電流
値が、夫々基準電圧値及び基準電流値に一致し、太陽電
池の出力電力は、太陽電池の出力特性と上記出力電圧値
とにより決定される電力に制御される。According to this configuration, the control means has a minor loop for controlling the output current of the solar cell, and controls the output voltage of the solar cell through control of the output current. As a result, the output voltage value and the output current value of the solar cell match the reference voltage value and the reference current value, respectively, and the output power of the solar cell is the power determined by the output characteristics of the solar cell and the output voltage value. Is controlled.
【００１５】この場合、直流電源回路の出力電圧値と所
定の制限電圧値との差分に基づいて前記マイナーループ
における基準電流値を制限するので、直流電源回路の出
力電圧の異常上昇を抑制することができる。特に、この
基準電流は、オンオフによる不連続な制限とは異なり連
続した値を保持しながら制限されるので、太陽電池の動
作点が不連続に変化することがなく、太陽電池から直流
電源回路へ電力が安定して送られる。In this case, since the reference current value in the minor loop is limited based on the difference between the output voltage value of the DC power supply circuit and the predetermined limit voltage value, it is possible to suppress an abnormal increase in the output voltage of the DC power supply circuit. Can be. In particular, since this reference current is limited while maintaining a continuous value unlike the discontinuous limitation due to on / off, the operating point of the solar cell does not change discontinuously, and the solar cell is connected to the DC power supply circuit. Power is sent stably.
【００１６】このとき、制御手段は、太陽電池の出力電
力が最大となるように当該太陽電池に対する基準電圧値
を決定することが好ましい（請求項２）。この構成によ
れば、太陽光発電インバータ装置は最大電力点追従制御
が可能となり、最も効率良く電力を供給可能となる。At this time, it is preferable that the control means determines a reference voltage value for the solar cell so that the output power of the solar cell becomes maximum (claim 2). According to this configuration, the photovoltaic power generation inverter device can perform maximum power point tracking control, and can supply power most efficiently.
【００１７】また、太陽電池の出力電力が最大となるよ
うに決定された当該太陽電池に対する基準電圧値を記憶
する記憶手段を備え、制御手段は、その記憶手段に記憶
された基準電圧値を用いて直流電源回路を制御すると良
い（請求項３）。この構成によれば、最大電力点追従制
御が正常に行われた時の太陽電池に対する基準電圧値を
記憶手段に記憶し、雨の日や朝夕など太陽電池の出力が
低下している低出力連系運転時或いは自立運転時には、
その記憶した基準電圧値を記憶手段から読み出して用い
るので、天候状態や運転モードによらず常に太陽電池の
出力を最大電力に近い値に制御可能となり、電力の利用
率を高めることができる。また、自立運転時において過
負荷が生じても、その過負荷状態が解消すれば、直ちに
交流電圧が回復するという復帰特性を持つことができ
る。[0017] Further, there is provided storage means for storing a reference voltage value for the solar cell determined so that the output power of the solar cell becomes maximum, and the control means uses the reference voltage value stored in the storage means. It is preferable to control the DC power supply circuit by using the DC power supply circuit. According to this configuration, the reference voltage value for the solar cell when the maximum power point tracking control is normally performed is stored in the storage unit, and the low output power in which the output of the solar cell is reduced such as on a rainy day or morning and evening. During system operation or autonomous operation,
Since the stored reference voltage value is read from the storage means and used, the output of the solar cell can always be controlled to a value close to the maximum power irrespective of the weather condition or the operation mode, and the power utilization rate can be increased. In addition, even if an overload occurs during the self-sustaining operation, the AC voltage can be restored immediately if the overload state is resolved.
【００１８】さらに、制御手段は、太陽電池の出力電圧
値または基準電圧値と当該太陽電池の出力電流値または
基準電流値との積から当該太陽電池の出力電力を求める
とともに、直流電源回路の出力電圧値と当該直流電源回
路に対する所定の基準電圧値との電圧偏差に応じた電力
補正値を求め、これら出力電力と電力補正値との和が交
流出力電力と一致するようにインバータ回路を制御する
ように構成することができる（請求項４）。Further, the control means obtains the output power of the solar cell from the product of the output voltage value or the reference voltage value of the solar cell and the output current value or the reference current value of the solar cell. A power correction value corresponding to a voltage deviation between the voltage value and a predetermined reference voltage value for the DC power supply circuit is obtained, and the inverter circuit is controlled such that the sum of the output power and the power correction value matches the AC output power. (Claim 4).
【００１９】この構成によれば、制御手段は、太陽電池
の出力電圧値または基準電圧値と太陽電池の出力電流値
または基準電流値とを乗算して、太陽電池から直流電源
回路へ送出される電力を求め、この電力をインバータ回
路におけるフィードフォワード制御に用いる。これによ
り、インバータ回路は、電力に対する高速応答を有する
ことになり、応答遅れによる最大電力点追従制御の不安
定化を抑制することができる。この電力の演算に際し、
直流電源回路の出力電圧値と直流電源回路に対する所定
の基準電圧値との電圧偏差に応じた電力補正値が加算さ
れるので、電力演算の誤差や外乱等があっても、太陽電
池の出力電力とインバータ回路の出力電力は常にバラン
スすることができる。According to this configuration, the control means multiplies the output voltage value or the reference voltage value of the solar cell by the output current value or the reference current value of the solar cell, and sends the multiplied value from the solar cell to the DC power supply circuit. Power is obtained, and this power is used for feedforward control in the inverter circuit. As a result, the inverter circuit has a high-speed response to electric power, and it is possible to suppress instability of the maximum power point tracking control due to a response delay. In calculating this power,
Since the power correction value according to the voltage deviation between the output voltage value of the DC power supply circuit and a predetermined reference voltage value for the DC power supply circuit is added, even if there is an error in power calculation or disturbance, the output power of the solar cell is And the output power of the inverter circuit can always be balanced.
【００２０】この場合、制御手段は、太陽電池の出力電
力と電力補正値との和をインバータ回路の交流電圧値と
出力力率のうち少なくとも交流電圧値で除すことにより
当該インバータ回路に対する基準交流電流値を求め、こ
の基準交流電流値と交流電流値が一致するように当該イ
ンバータ回路を制御すると良い（請求項５）。この構成
によれば、制御手段は、インバータ回路から出力される
交流電流を、太陽電池の出力電力と前記電力補正値との
和に基づいて演算された基準交流電流値と一致するよう
に高速に制御する。In this case, the control means divides the sum of the output power of the solar cell and the power correction value by at least the AC voltage value of the AC voltage value and the output power factor of the inverter circuit, thereby obtaining a reference AC voltage for the inverter circuit. It is preferable that a current value is obtained and the inverter circuit is controlled so that the reference AC current value and the AC current value match. According to this configuration, the control unit changes the AC current output from the inverter circuit at high speed so as to match the reference AC current value calculated based on the sum of the output power of the solar cell and the power correction value. Control.
【００２１】さらに、制御手段は、太陽電池の出力電力
に替えて、当該太陽電池の出力電力に更に直流電源回路
及びインバータ回路の効率を乗じて得た電力を用いて当
該インバータ回路を制御することが好ましい（請求項
６）。この構成によれば、インバータ回路から出力すべ
き電力をより正確に求めることができ、インバータ回路
はより速く且つ精度の高い制御性能を有することにな
る。従って、最大電力点追従制御をより安定化すること
ができ且つその追従性を一層向上することができる。Further, the control means controls the inverter circuit using the power obtained by multiplying the output power of the solar cell by the efficiency of the DC power supply circuit and the inverter circuit, instead of the output power of the solar cell. Is preferable (claim 6). According to this configuration, the power to be output from the inverter circuit can be more accurately obtained, and the inverter circuit has faster and more accurate control performance. Therefore, the maximum power point tracking control can be further stabilized and its tracking ability can be further improved.
【００２２】[0022]
【発明の実施の形態】以下、本発明の第１の実施例につ
いて、図１を参照しながら説明する。なお、図１におい
て、図３と同一部分には同一符号を付して示すものとす
る。システム全体の電気的構成を示した図１において、
太陽光発電インバータ装置３８は、太陽電池２、直流電
源回路３、インバータ回路４、フィルタ回路５、ブレー
カ６、制御手段としての制御回路３９、及び各部の電
圧、電流を検出するための検出器８〜１２から構成され
ている。この太陽電池２は、太陽光を受けることによ
り、例えば定格電圧２００Ｖ、開放電圧３００Ｖの直流
電圧を出力するものである。また、図示しないが、太陽
光発電インバータ装置３８の交流出力を電力系統である
交流電源１３に連系するための開閉器が設けられてい
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIG. In FIG. 1, the same parts as those in FIG. 3 are denoted by the same reference numerals. In FIG. 1 showing the electrical configuration of the entire system,
The photovoltaic power generation inverter device 38 includes a solar cell 2, a DC power supply circuit 3, an inverter circuit 4, a filter circuit 5, a breaker 6, a control circuit 39 as control means, and a detector 8 for detecting the voltage and current of each unit. ~ 12. The solar cell 2 outputs a DC voltage having a rated voltage of 200 V and an open voltage of 300 V, for example, by receiving sunlight. Although not shown, a switch for connecting the AC output of the photovoltaic power generation inverter device 38 to the AC power supply 13 which is a power system is provided.
【００２３】直流電源回路３は、リアクトル４０、ダイ
オード４１、コンデンサ４２、及びスイッチング素子例
えばＩＧＢＴ４３を周知の回路である昇圧チョッパ回路
として構成したものである。即ち、太陽電池２の正側の
出力線４４は、リアクトル４０及び図示方向のダイオー
ド４１を直列に介してインバータ回路４の正側の入力端
子に接続され、太陽電池２の負側の出力線４５は直流電
源回路３を通してインバータ回路４の負側の入力端子に
接続されている。ダイオード４１のアノードと出力線４
５との間にはＩＧＢＴ４３のコレクタ・エミッタ間が接
続されており、ダイオード４１のカソードと出力線４５
との間にはコンデンサ４２が接続されている。直流電源
回路３の出力端子間には例えば分圧用の抵抗を用いた電
圧検出器９が設けられている。この電圧検出器９は、直
流電源回路３から出力される昇圧された直流電圧を検出
し、出力電圧値ＶD2として制御回路３９に対し出力する
ように構成されている。The DC power supply circuit 3 comprises a reactor 40, a diode 41, a capacitor 42, and a switching element, for example, an IGBT 43, as a well-known circuit as a step-up chopper circuit. That is, the positive output line 44 of the solar cell 2 is connected to the positive input terminal of the inverter circuit 4 via the reactor 40 and the diode 41 in the illustrated direction in series, and the negative output line 45 of the solar cell 2 is connected. Is connected to the negative input terminal of the inverter circuit 4 through the DC power supply circuit 3. Anode of diode 41 and output line 4
5 is connected between the collector and the emitter of the IGBT 43, and the cathode of the diode 41 and the output line 45 are connected.
Is connected to the capacitor 42. A voltage detector 9 using, for example, a voltage dividing resistor is provided between output terminals of the DC power supply circuit 3. The voltage detector 9 is configured to detect a boosted DC voltage output from the DC power supply circuit 3 and output the detected DC voltage to the control circuit 39 as an output voltage value VD2.
【００２４】また、太陽電池２の出力端子間には例えば
分圧用の抵抗を用いた電圧検出器８が設けられており、
その電圧検出器８は、太陽電池２が出力する直流電圧を
検出し出力電圧値ＶD1として制御回路３９に対し出力す
るように構成されている。さらに、出力線４５には例え
ばホール素子を用いた電流検出器１１が設けられてお
り、その電流検出器１１は、太陽電池２が出力する直流
電流を検出し出力電流値ＩD1として制御回路３９に対し
出力するようになっている。A voltage detector 8 using, for example, a voltage dividing resistor is provided between output terminals of the solar cell 2.
The voltage detector 8 is configured to detect a DC voltage output from the solar cell 2 and output the detected DC voltage to the control circuit 39 as an output voltage value VD1. Further, the output line 45 is provided with, for example, a current detector 11 using a Hall element. The current detector 11 detects a DC current output from the solar cell 2 and outputs the detected DC current to the control circuit 39 as an output current value ID1. Output.
【００２５】インバータ回路４は、４個のスイッチング
素子例えばＩＧＢＴ４６〜４９と４個の還流ダイオード
５０〜５３とを周知の回路である単相ブリッジ回路とし
て構成したものである。その出力線５４、５５は、リア
クトル５６及びコンデンサ５７からなるフィルタ回路５
及びブレーカ６を介して、例えば商用単相１００Ｖの交
流電源１３に連系可能に接続されている。ここで、フィ
ルタ回路５は、リアクトル５６が出力線５４に挿入さ
れ、コンデンサ５７がリアクトル５６の系統（交流電源
１３）側において出力線５４、５５の間に接続された回
路形態を有して構成されるものである。The inverter circuit 4 comprises four switching elements, for example, IGBTs 46 to 49 and four return diodes 50 to 53, as a well-known single-phase bridge circuit. The output lines 54 and 55 are connected to a filter circuit 5 including a reactor 56 and a capacitor 57.
And a breaker 6 for connection to a commercial single-phase 100V AC power supply 13, for example. Here, the filter circuit 5 has a circuit configuration in which a reactor 56 is inserted into the output line 54 and a capacitor 57 is connected between the output lines 54 and 55 on the system (AC power supply 13) side of the reactor 56. Is what is done.
【００２６】また、フィルタ回路５の出力端子間には、
例えばＰＴ（計器用変圧器）や差動アンプからなる電圧
検出器１０が設けられており、その電圧検出器１０は、
太陽光発電インバータ装置３８が出力する交流電圧（系
統連系時においては交流電源１３の電圧）を検出し、交
流電圧ＶACとして制御回路３９に対し出力するように構
成されている。さらに、出力線５５には例えばホール素
子を用いた電流検出器１２が設けられており、その電流
検出器１２は、インバータ回路４が出力する交流電流Ｉ
ACを検出し制御回路３９に対し出力するようになってい
る。Further, between the output terminals of the filter circuit 5,
For example, a voltage detector 10 including a PT (instrument transformer) and a differential amplifier is provided.
The AC voltage output from the photovoltaic power inverter device 38 (the voltage of the AC power supply 13 at the time of system interconnection) is detected and output to the control circuit 39 as the AC voltage VAC. Further, the output line 55 is provided with a current detector 12 using, for example, a Hall element, and the current detector 12 outputs the AC current I output from the inverter circuit 4.
AC is detected and output to the control circuit 39.
【００２７】一方、制御回路３９はマイクロコンピュー
タを主体として構成されるものであって、直流電源回路
３を制御する直流電源制御回路５８とインバータ回路４
を制御するインバータ制御回路５９とを備えている。こ
のうち、直流電源制御回路５８は以下のように構成され
ている。即ち、電力検出回路１６は、太陽電池２の出力
電圧値ＶD1と出力電流値ＩD1とを乗算器（図示せず）に
よって掛け合わせることにより太陽電池２の出力電力Ｐ
1 を求め、それを最大電力点検出回路１７に対して出力
するようになっている。On the other hand, the control circuit 39 is mainly composed of a microcomputer, and comprises a DC power supply control circuit 58 for controlling the DC power supply circuit 3 and an inverter circuit 4.
And an inverter control circuit 59 for controlling the Among them, the DC power supply control circuit 58 is configured as follows. That is, the power detection circuit 16 multiplies the output voltage value VD1 of the solar cell 2 and the output current value ID1 by a multiplier (not shown) to thereby obtain the output power P of the solar cell 2.
1 and outputs it to the maximum power point detection circuit 17.
【００２８】最大電力点検出回路１７は、ＭＰＰＴ制御
（Maximum Power Point Tracking：最大電力点追従制
御）を行うに際し、太陽電池２が最大電力を出力し得る
基準電圧値ＶD1* を求める回路であり、現在の基準電圧
値ＶD1* を所定の微少電圧値−ΔＶ* 、＋ΔＶ* の範囲
内で変動させたときの太陽電池２の出力電力Ｐ1 の変化
に基づいて、基準電圧値ＶD1* を最大電力点となる値に
調整するように構成されている。The maximum power point detection circuit 17 is a circuit for obtaining a reference voltage value VD1 * at which the solar cell 2 can output maximum power when performing MPPT control (Maximum Power Point Tracking control). Based on the change in the output power P1 of the solar cell 2 when the current reference voltage value VD1 * is varied within the range of the predetermined minute voltage values -.DELTA.V * and + .DELTA.V *, the reference voltage value VD1 * is set to the maximum power point. It is configured to adjust to a value such that
【００２９】減算回路１８は、太陽電池２の出力電圧値
ＶD1から上記基準電圧値ＶD1* を減算し、制御器１９
は、その減算結果である電圧偏差に対して例えば比例演
算と積分演算（以下、ＰＩ演算と称す）を行い、太陽電
池２に対する基準電流値ＩD1*を出力するようになって
いる。この制御器１９の後の減算回路２０は、上記基準
電流値ＩD1* から太陽電池２の出力電流値ＩD1を減算
し、制御器２１は、その減算結果である電流偏差に対し
て例えばＰＩ演算を行いＰＷＭ回路２２に対する変調信
号を生成するように構成されている。これにより、直流
電源制御回路５８は、電流マイナーループを有した電圧
制御回路を構成することになる。The subtraction circuit 18 subtracts the reference voltage value VD1 * from the output voltage value VD1 of the solar cell 2, and a controller 19
Performs a proportional operation and an integral operation (hereinafter, referred to as PI operation) on the voltage deviation as a result of the subtraction, and outputs a reference current value ID1 * for the solar cell 2. A subtraction circuit 20 after the controller 19 subtracts the output current value ID1 of the solar cell 2 from the reference current value ID1 *, and the controller 21 performs, for example, a PI operation on the current deviation resulting from the subtraction. It is configured to generate a modulation signal for the PWM circuit 22. As a result, the DC power supply control circuit 58 constitutes a voltage control circuit having a current minor loop.
【００３０】ＰＷＭ回路２２は、所定の周波数を有した
三角波信号を生成するキャリア信号発生回路、及びこの
生成した三角波信号と制御器２１から出力された変調信
号とを比較する比較器（何れも図示せず）から構成され
ている。そして、比較器から得られた方形波状の駆動信
号Ｓ1 は、図示しないドライブ回路を介してＩＧＢＴ４
３のゲートに与えられるようになっている。この場合、
制御器２１から出力された変調信号のレベルが高くなる
程、駆動信号Ｓ1 のデューティ比が大きくなり、ＩＧＢ
Ｔ４３のオン時間の割合が長くなるようになっている。The PWM circuit 22 includes a carrier signal generating circuit for generating a triangular wave signal having a predetermined frequency, and a comparator for comparing the generated triangular wave signal with the modulation signal output from the controller 21 (both in FIG. (Not shown). The square-wave drive signal S1 obtained from the comparator is supplied to the IGBT 4 via a drive circuit (not shown).
3 gates. in this case,
As the level of the modulation signal output from the controller 21 increases, the duty ratio of the drive signal S1 increases,
The ratio of the ON time of T43 becomes longer.
【００３１】さらに、直流電源制御回路５８には、直流
電源回路３の出力過電圧を防止するために、減算回路２
３、制御器２４、及びリミット回路６０が設けられてい
る。減算回路２３は、直流電源回路３の出力電圧値ＶD2
から直流電源回路３に対して予め設定された制限電圧値
ＶD2L*を減算し、その減算結果は制御器２４において増
幅された後リミット回路６０に入力される。リミット回
路６０は、その増幅結果に基づいて、ＶD2L*＜ＶD2とな
ったときに制御器１９に対し基準電流値ＩD1*を制限す
るための制限信号を与えるようになっている。Further, the DC power supply control circuit 58 includes a subtraction circuit 2 in order to prevent an output overvoltage of the DC power supply circuit 3.
3, a controller 24, and a limit circuit 60 are provided. The subtraction circuit 23 outputs the output voltage value VD2 of the DC power supply circuit 3.
Is subtracted from the DC power supply circuit 3 by a preset limit voltage value VD2L *. The result of the subtraction is amplified by the controller 24 and then input to the limit circuit 60. The limit circuit 60 supplies a limit signal for limiting the reference current value ID1 * to the controller 19 when VD2L * <VD2 based on the amplification result.
【００３２】これに対し、インバータ制御回路５９は以
下のように構成されている。即ち、発電電力演算回路６
１は、太陽電池２の出力電圧値ＶD1と太陽電池２に対す
る基準電流値ＩD1* とを乗算器（図示せず）によって掛
け合わせることにより太陽電池２の出力電力Ｐ1'を求
め、出力電力演算回路６２は、乗算器（図示せず）を用
いてこの出力電力Ｐ1'に更に直流電源回路３及びインバ
ータ回路４の効率を掛けることにより、インバータ回路
４の出力電力Ｐo を求めるようになっている。On the other hand, the inverter control circuit 59 is configured as follows. That is, the generated power calculation circuit 6
1 obtains an output power P1 'of the solar cell 2 by multiplying an output voltage value VD1 of the solar cell 2 and a reference current value ID1 * for the solar cell 2 by a multiplier (not shown). The output power Po of the inverter circuit 4 is obtained by multiplying the output power P1 'by the efficiency of the DC power supply circuit 3 and the inverter circuit 4 using a multiplier (not shown).
【００３３】減算回路２６は、直流電源回路３の出力電
圧値ＶD2から直流電源回路３に対して予め設定された基
準電圧値ＶD2* を減算し、制御器２７は、その減算結果
である電圧偏差に対してＰＩ演算を行って電力補正値Δ
Ｐo を求めるようになっている。そして、加算回路６３
は、出力電力演算回路６２にて演算された上記出力電力
Ｐo と、制御器２７から得た上記電力補正値ΔＰo とを
加算して、太陽光発電インバータ装置３８から出力すべ
き電力Ｐo*を求めるようになっている。The subtraction circuit 26 subtracts a reference voltage value VD2 * preset for the DC power supply circuit 3 from the output voltage value VD2 of the DC power supply circuit 3, and the controller 27 generates a voltage deviation as a result of the subtraction. To calculate the power correction value Δ
Po is being sought. Then, the addition circuit 63
Is obtained by adding the output power Po calculated by the output power calculation circuit 62 and the power correction value ΔPo obtained from the controller 27 to obtain the power Po * to be output from the photovoltaic power generation inverter device 38. It has become.
【００３４】電圧値検出回路２９は、電圧検出器１０か
ら出力される交流電圧ＶACを整流、平滑して、太陽光発
電インバータ装置３８が出力する交流電圧（系統連系時
においては交流電源１３の電圧）の実効値ＶAC(rms) を
得るように構成されている。また、力率調整回路３１
は、進相無効電力制御を行うために設けられたもので、
交流電圧ＶACが所定の値例えば１０７Ｖ以上となったと
きに、本来１に調整する力率を進み力率に設定するよう
になっている。除算回路２８は、加算回路６３から出力
される電力Ｐo*を上記実効値ＶAC(rms) 及び上記力率で
割ることにより、後述する基準交流電流ＩAC* の振幅
（実効値）を得るようになっている。The voltage value detection circuit 29 rectifies and smoothes the AC voltage VAC output from the voltage detector 10, and outputs the AC voltage (the AC power supply 13 ), So as to obtain an effective value VAC (rms). The power factor adjusting circuit 31
Is provided to perform advanced phase reactive power control,
When the AC voltage VAC becomes a predetermined value, for example, 107 V or more, the power factor which is originally adjusted to 1 is set as the leading power factor. The dividing circuit 28 obtains the amplitude (effective value) of a reference AC current IAC * to be described later by dividing the power Po * output from the adding circuit 63 by the effective value VAC (rms) and the power factor. ing.
【００３５】正弦波発生回路３２は、交流電圧ＶACのゼ
ロクロス点を検出するゼロクロス検出回路と、予めメモ
リに記憶された正弦波データに基づいて交流電源１３の
周波数５０Ｈｚ（或いは６０Ｈｚ）と同じ周波数を有す
る正弦波形を生成する波形発生回路（何れも図示せず）
とを備えて構成されている。そして、検出したゼロクロ
ス点に同期し、且つ力率調整回路３１から与えられる力
率に対応して進相させた正弦波信号を生成するようにな
っている。The sine wave generation circuit 32 detects a zero cross point of the AC voltage VAC, and generates the same frequency as 50 Hz (or 60 Hz) of the AC power supply 13 based on sine wave data stored in a memory in advance. Waveform generating circuit for generating a sinusoidal waveform (not shown)
It is comprised including. Then, a sine wave signal synchronized with the detected zero-cross point and advanced in phase corresponding to the power factor given from the power factor adjustment circuit 31 is generated.
【００３６】乗算回路３０は、前記除算回路２８の出力
と前記正弦波発生回路３２から出力される正弦波信号と
を掛け合わせることにより、インバータ回路４に対する
基準交流電流ＩAC* を生成するようになっている。減算
回路３３は、この基準交流電流ＩAC* から交流電流ＩAC
を減算し、制御器３４は、その減算結果である電流偏差
に対して例えばＰＩ演算を行いＰＷＭ回路３５に対する
変調信号を生成するように構成されている。The multiplication circuit 30 generates a reference AC current IAC * for the inverter circuit 4 by multiplying the output of the division circuit 28 and the sine wave signal output from the sine wave generation circuit 32. ing. The subtracting circuit 33 calculates an AC current IAC from the reference AC current IAC *.
The controller 34 is configured to perform, for example, a PI operation on the current deviation as a result of the subtraction to generate a modulation signal for the PWM circuit 35.
【００３７】ＰＷＭ回路３５は、所定の周波数を有した
三角波信号を生成するキャリア信号発生回路、及びこの
生成した三角波信号と制御器３４から出力された変調信
号とを比較する比較器（何れも図示せず）から構成され
ている。この比較結果に基づいて、方形波状の駆動信号
Ｓ2 、Ｓ3 及びこれら駆動信号Ｓ2 、Ｓ3 に対し夫々反
転波形となる駆動信号Ｓ4 、Ｓ5 が生成され、これら駆
動信号Ｓ2 〜Ｓ5 は夫々図示しないドライブ回路を介し
てＩＧＢＴ４６〜４９のゲートに与えられるようになっ
ている。この場合、制御器３４から出力された変調信号
のレベルが高くなる程インバータ回路４の出力交流電圧
が大きくなるようになっている。The PWM circuit 35 includes a carrier signal generating circuit for generating a triangular wave signal having a predetermined frequency, and a comparator for comparing the generated triangular wave signal with the modulation signal output from the controller 34 (both in FIG. (Not shown). Based on the comparison result, square wave drive signals S2 and S3 and drive signals S4 and S5 having inverted waveforms with respect to the drive signals S2 and S3 are generated, and these drive signals S2 to S5 are respectively not shown in the drive circuit (not shown). Through the gates of the IGBTs 46 to 49. In this case, as the level of the modulation signal output from the controller 34 increases, the output AC voltage of the inverter circuit 4 increases.
【００３８】次に、系統連系時における本実施例の作用
について説明する。制御回路３９のうち直流電源制御回
路５８は、太陽電池２に対する最大電力点追従制御を行
うことにより、太陽電池２の出力電力が最も有効にイン
バータ回路４に送られるように直流電源回路３の制御を
行う。太陽電池２の出力電力は、図６の出力特性に示し
たように、特定の出力電圧値Ｖ2 （動作点Ａ2 ）におい
て最大となり、出力電圧値ＶD1がこの電圧値Ｖ2 からず
れると低下する特性を有している。そして、日照状態が
変化すると最大電力点における電力値が変化するととも
に最大電力点となる出力電圧値ＶD1も若干変化する。そ
こで、最大電力点検出回路１７は、系統連系運転中にお
いて現在の基準電圧値ＶD1* を所定の微少電圧値−ΔＶ
* （動作点Ａ1 ）、＋ΔＶ* （動作点Ａ3 ）だけ変動さ
せ、そのときの出力電力Ｐ1 の変化に基づいて最大電力
が出力され得る基準電圧値ＶD1* を求めるように動作す
る。Next, the operation of this embodiment at the time of system interconnection will be described. The DC power supply control circuit 58 of the control circuit 39 controls the DC power supply circuit 3 so that the output power of the solar cell 2 is transmitted to the inverter circuit 4 most effectively by performing the maximum power point tracking control for the solar cell 2. I do. As shown in the output characteristic of FIG. 6, the output power of the solar cell 2 becomes maximum at a specific output voltage value V2 (operating point A2), and decreases when the output voltage value VD1 deviates from this voltage value V2. Have. When the sunshine state changes, the power value at the maximum power point changes, and the output voltage value VD1 at the maximum power point also slightly changes. Therefore, the maximum power point detecting circuit 17 sets the current reference voltage value VD1 * to a predetermined minute voltage value -ΔV
* (Operating point A1) and + ΔV * (operating point A3), and the reference voltage value VD1 * at which the maximum power can be output is obtained based on the change in the output power P1 at that time.
【００３９】このようにして求めた基準電圧値ＶD1* に
対し、太陽電池２の出力電圧値ＶD1が低下した場合を考
える。太陽電池２は、出力電圧ＶD1の増加に伴って出力
電流ＩD1が単調に減少する出力特性（図示せず）を有し
ているので、制御器１９は太陽電池２の基準電流値ＩD1
* を下げるように動作する。その結果、制御器２１から
ＰＷＭ回路２２に対し出力される変調信号が低下し、直
流電源回路３におけるＩＧＢＴ４３のオン時間が短くな
る。これにより、太陽電池２の出力電流値ＩD1は低下
し、それに伴い出力電圧値ＶD1が上昇して基準電圧値Ｖ
D1* に一致するよう制御されることになる。Consider a case where the output voltage value VD1 of the solar cell 2 is lower than the reference voltage value VD1 * thus obtained. Since the solar cell 2 has an output characteristic (not shown) in which the output current ID1 monotonously decreases with an increase in the output voltage VD1, the controller 19 controls the reference current value ID1 of the solar cell 2.
* Works to lower. As a result, the modulation signal output from the controller 21 to the PWM circuit 22 decreases, and the ON time of the IGBT 43 in the DC power supply circuit 3 decreases. As a result, the output current value ID1 of the solar cell 2 decreases, and accordingly, the output voltage value VD1 increases to increase the reference voltage value VD1.
It will be controlled to match D1 *.
【００４０】さて、起動時について考えると、交流電流
が歪むことのないように、先ず直流電源回路３の出力電
圧ＶD2を上昇させ、その後インバータ回路４を起動する
必要がある。この場合、直流電源制御回路５８が制御を
開始すると、直流電源回路３の出力電圧値ＶD2が上昇し
やがて制限電圧値ＶD2L*に達する。出力電圧値ＶD2が更
に上昇すると、減算回路２３により演算される（ＶD2−
ＶD2L*）が正となるので、リミット回路６０は、制御器
１９に対して制御器２４で増幅された値に応じた制限信
号を出力するようになる。制御器１９は、この制限信号
の大きさに応じて基準電流値ＩD1* を下げるので、直流
電源回路３の出力電圧ＶD2の上昇を抑制することができ
る。Considering the start-up time, it is necessary to first increase the output voltage VD2 of the DC power supply circuit 3 and then start the inverter circuit 4 so that the AC current is not distorted. In this case, when the DC power supply control circuit 58 starts the control, the output voltage value VD2 of the DC power supply circuit 3 increases and eventually reaches the limit voltage value VD2L *. When the output voltage value VD2 further increases, a calculation is performed by the subtraction circuit 23 (VD2−
Since VD2L *) becomes positive, the limit circuit 60 outputs a limit signal to the controller 19 in accordance with the value amplified by the controller 24. The controller 19 reduces the reference current value ID1 * according to the magnitude of the limit signal, so that the output voltage VD2 of the DC power supply circuit 3 can be suppressed from rising.
【００４１】一方、インバータ制御回路５９は、太陽光
発電インバータ装置３８の電力の入出力をバランスさせ
るように、太陽電池２から直流電源回路３に送られた電
力に略等しい電力を、交流電力として系統に出力するよ
うインバータ回路４を制御する。この制御において、太
陽電池２の出力電力Ｐ1 、出力電圧値ＶD1、出力電流値
ＩD1、インバータ回路４の出力電力Ｐo 、交流電圧ＶA
C、交流電流ＩAC、力率ｃｏｓφ、直流電源回路３及び
インバータ回路４の効率ηの関係は、以下の各式に示す
通りになる。On the other hand, the inverter control circuit 59 converts power substantially equal to the power transmitted from the solar cell 2 to the DC power supply circuit 3 into AC power so as to balance the input and output of power of the solar power generation inverter device 38. The inverter circuit 4 is controlled so as to output to the system. In this control, the output power P1 of the solar cell 2, the output voltage value VD1, the output current value ID1, the output power Po of the inverter circuit 4, the AC voltage VA
The relationship among C, AC current IAC, power factor cos φ, and efficiency η of DC power supply circuit 3 and inverter circuit 4 is as shown in the following equations.
【００４２】 Ｐ1 ＝ＶD1・ＩD1 …（１） Ｐo ＝ＶAC・ＩAC・ｃｏｓφ …（２） Ｐo ＝η・Ｐ1 …（３）P1 = VD1 · ID1 (1) Po = VAC · IAC · cosφ (2) Po = η · P1 (3)
【００４３】電圧制御及び電流制御が高速且つ高精度に
行われるものとすれば、更に以下の関係式が成立する。 ＶD1＝ＶD1* …（４） ＩD1＝ＩD1* …（５） ＩAC＝ＩAC* …（６）Assuming that voltage control and current control are performed at high speed and with high accuracy, the following relational expressions are further satisfied. VD1 = VD1 * (4) ID1 = ID1 * (5) IAC = IAC * (6)
【００４４】従って、インバータ制御回路５９は、イン
バータ回路４に対する基準交流電流ＩAC* として、以下
の式により求めた値を設定すれば良い。 ＩAC* ＝（ＶD1・ＩD1* ・η）／（ＶAC・ｃｏｓφ） …（７）Therefore, the inverter control circuit 59 may set the value obtained by the following equation as the reference AC current IAC * for the inverter circuit 4. IAC * = (VD1 · ID1 * · η) / (VAC · cosφ) (7)
【００４５】この（７）式における（ＶD1・ＩD1* ・
η）、（ＶAC・ｃｏｓφ）、及びこれらの除算は、夫々
図１において、発電電力演算回路６１と出力電力演算回
路６２、電圧値検出回路２９と力率調整回路３１、及び
除算回路２８において演算される。この除算回路２８
は、（７）式に従って系統の電圧である交流電圧値ＶAC
による除算を実行しているので、動力負荷接続等の外乱
によって交流電圧値ＶACが低下しても、直ちに基準交流
電流ＩAC* が増加して、インバータ回路４の出力電力の
低下を抑制することができる。In the equation (7), (VD1 · ID1 * ·
η), (VAC · cos φ), and their division are calculated by the generated power calculation circuit 61 and the output power calculation circuit 62, the voltage value detection circuit 29, the power factor adjustment circuit 31, and the division circuit 28 in FIG. Is done. This division circuit 28
Is an AC voltage value VAC which is a system voltage according to the equation (7).
Therefore, even if the AC voltage value VAC decreases due to disturbance such as connection of a power load, the reference AC current IAC * immediately increases and the decrease in the output power of the inverter circuit 4 can be suppressed. it can.
【００４６】なお、制御応答が速い場合には、この
（７）式においてＶD1をＶD1* に置き替え、ＩD1* をＩ
D1に置き替えても略同様の制御結果を得ることができ
る。この場合には、発電電力演算回路６１を省略し、出
力電力Ｐ1'に代えて電力検出回路１６の出力電力Ｐ1 を
用いても良い。また、直流電源回路３及びインバータ回
路４の効率ηが高い場合には、出力電力演算回路６２を
省いた構成とし、力率ｃｏｓφが高い場合には、除算回
路２８は加算回路６３から出力される電力Ｐo*を実効値
ＶAC(rms) のみで割る構成としても略同様の制御結果を
得ることができる。When the control response is fast, VD1 is replaced by VD1 * in the equation (7), and ID1 * is replaced by Id *.
Substantially the same control result can be obtained even if the D1 is replaced. In this case, the generated power calculation circuit 61 may be omitted, and the output power P1 of the power detection circuit 16 may be used instead of the output power P1 '. When the efficiency η of the DC power supply circuit 3 and the inverter circuit 4 is high, the output power calculation circuit 62 is omitted, and when the power factor cos φ is high, the division circuit 28 is output from the addition circuit 63. Even when the power Po * is divided by only the effective value VAC (rms), substantially the same control result can be obtained.
【００４７】さらに、演算誤差や外乱等による演算のず
れを補正するため、出力電力Ｐo に対し、出力電圧値Ｖ
D2と基準電圧値ＶD2* との差分に基づく電力補正値ΔＰ
o が加算される。例えば、出力電圧値ＶD2が基準電圧値
ＶD2* よりも増加した場合には、電力補正値ΔＰo が正
になり、インバータ制御回路５９は、基準電力Ｐo*を増
やしてインバータ回路４からの出力電力を増加させ、出
力電圧値ＶD2の上昇を抑制するように制御する。Further, in order to correct a calculation error due to a calculation error or a disturbance, the output voltage value V
Power correction value ΔP based on the difference between D2 and reference voltage value VD2 *
o is added. For example, when the output voltage value VD2 is higher than the reference voltage value VD2 *, the power correction value ΔPo becomes positive, and the inverter control circuit 59 increases the reference power Po * to reduce the output power from the inverter circuit 4. The output voltage VD2 is controlled so as to suppress the increase.
【００４８】以上述べたように、本実施例の太陽光発電
インバータ装置３８によれば、起動時等において直流電
源回路３の出力過電圧を防止するため、直流電源制御回
路５８にリミット回路６０を設け、基準電流値ＩD1* に
対して制限をかけるように構成した点に特徴を有する。
このとき基準電流値ＩD1* は、オンオフによる不連続な
制限とは異なり、連続した値を保持しながら徐々に制限
されるので、太陽電池２の動作点が不連続に変化するこ
とがなく、太陽電池２から直流電源回路３への電力の送
出が安定して行われる。As described above, according to the photovoltaic power generation inverter device 38 of the present embodiment, the limit circuit 60 is provided in the DC power supply control circuit 58 in order to prevent the output overvoltage of the DC power supply circuit 3 at the time of startup or the like. Is characterized in that the reference current value ID1 * is limited.
At this time, unlike the discontinuous limitation by ON / OFF, the reference current value ID1 * is gradually limited while maintaining a continuous value, so that the operating point of the solar cell 2 does not change discontinuously, Transmission of power from the battery 2 to the DC power supply circuit 3 is performed stably.
【００４９】また、インバータ制御回路５９において
は、発電電力演算回路６１と出力電力演算回路６２を設
けてインバータ回路４の出力電力Ｐo を演算し、その出
力電力Ｐo をフィードフォワード制御として用いた点に
特徴を有する。この制御構成によれば、直流電源回路３
の出力電圧ＶD2をフィードバックすることのみによる制
御（図３参照）に比べ制御系の応答速度が速くなる。従
って、例えば雲の流れが速い日など日照が周期的に変化
する場合であっても、直流電源回路３の出力電圧値ＶD2
は基準電圧値ＶD2* に近い値に保持され、リミット回路
６０による基準電流値ＩD1* の制限を受けにくくなるの
で、太陽電池２に対して安定した最大電力点追従制御を
行うことができる。さらに、リミット回路６０による電
流制限が一時的に発生したとしても、上述したように太
陽電池２の動作点が不連続に変化することがないので、
最大電力点追従制御が大きく乱れることがない。The inverter control circuit 59 is provided with a generated power calculation circuit 61 and an output power calculation circuit 62 to calculate the output power Po of the inverter circuit 4 and to use the output power Po for feedforward control. Has features. According to this control configuration, the DC power supply circuit 3
The response speed of the control system is faster than the control (see FIG. 3) only by feeding back the output voltage VD2. Therefore, even when the sunshine changes periodically, for example, on a day when the cloud flow is fast, the output voltage value VD2 of the DC power supply
Is maintained at a value close to the reference voltage value VD2 *, and is less likely to be limited by the reference current value ID1 * by the limit circuit 60, so that stable maximum power point tracking control for the solar cell 2 can be performed. Furthermore, even if the current limitation by the limit circuit 60 occurs temporarily, the operating point of the solar cell 2 does not change discontinuously as described above.
The maximum power point tracking control is not greatly disturbed.
【００５０】この場合、出力電力Ｐo*の演算に際し、直
流電源回路３の出力電圧値ＶD2と基準電圧値ＶD2* との
電圧偏差に応じた電力補正値ΔＰo が加算されるので、
電力演算の誤差や外乱等があっても、太陽電池２の出力
電力とインバータ回路４の出力電力とを常にバランスさ
せることができ、より高精度で安定した最大電力点追従
制御が可能となる。In this case, when calculating the output power Po *, the power correction value ΔPo corresponding to the voltage deviation between the output voltage value VD2 of the DC power supply circuit 3 and the reference voltage value VD2 * is added.
Even if there is a power calculation error, disturbance, or the like, the output power of the solar cell 2 and the output power of the inverter circuit 4 can always be balanced, and more accurate and stable maximum power point tracking control can be performed.
【００５１】次に、本発明の第２の実施例について、図
２を参照しながら説明する。なお、図２において、図１
と同一部分には同一符号を付し、ここでは異なった部分
についてのみ説明する。図２は、自立運転時又は低電力
連系運転時における直流電源制御回路のブロック図であ
る。ここで、自立運転とは系統に連系することなく発電
電力を負荷によって消費する運転モードであり、低電力
連系運転とは雨の日や朝夕等における低発電電力時にお
ける系統連系運転モードである。この図２において、直
流電源制御回路６４は、最大電力点検出回路１７（図１
参照）と減算回路１８との間に、書込制御回路６５、記
憶手段としてのメモリ回路６６、及び電圧基準回路６７
を備えている。また、自立運転時には、ブレーカ６が開
放されるとともに、負荷（図示せず）がフィルタ回路５
とブレーカ６との間に接続される。Next, a second embodiment of the present invention will be described with reference to FIG. In FIG. 2, FIG.
The same parts as those described above are denoted by the same reference numerals, and only different parts will be described here. FIG. 2 is a block diagram of the DC power supply control circuit during the self-sustaining operation or the low-power interconnection operation. Here, the self-sustained operation is an operation mode in which the generated power is consumed by the load without being connected to the grid, and the low-power interconnected operation is a grid-connected operation mode when the power generation is low on a rainy day or morning and evening. It is. 2, DC power supply control circuit 64 includes maximum power point detection circuit 17 (FIG. 1).
Write control circuit 65, a memory circuit 66 as storage means, and a voltage reference circuit 67.
It has. Further, at the time of the self-sustaining operation, the breaker 6 is opened, and the load (not shown) is connected to the filter circuit 5.
And the breaker 6.
【００５２】書込制御回路６５は、ＭＰＰＴ制御（最大
電力点追従制御）の実行中を示すＭＰＰＴ信号が与えら
れている間、最大電力点検出回路１７から出力される基
準電圧値ＶD1* を所定の時間間隔毎にメモリ回路６６に
書き込むようになっている。このメモリ回路６６は、例
えば不揮発性メモリであるＥＥＰＲＯＭから構成される
ものであり、制御電源がオフしてもその記憶された値を
保持できるようになっている。また、電圧基準回路６７
は、所定の時間間隔毎にメモリ回路６６に記憶されてい
る値を読み出して、その値に基づいて基準電圧値ＶD1*
を生成するように構成されている。なお、メモリ回路６
６には、基準電圧値ＶD1* に代えて、太陽電池２の出力
電圧値ＶD1を書き込むように構成しても良い。The write control circuit 65 determines the reference voltage value VD1 * output from the maximum power point detection circuit 17 while the MPPT signal indicating that the MPPT control (maximum power point follow-up control) is being executed is given. Is written to the memory circuit 66 at every time interval of. The memory circuit 66 is constituted by, for example, an EEPROM which is a nonvolatile memory, and can retain the stored value even when the control power supply is turned off. Also, the voltage reference circuit 67
Reads a value stored in the memory circuit 66 at predetermined time intervals, and, based on the value, reads a reference voltage value VD1 *
Is configured to generate Note that the memory circuit 6
6, the output voltage value VD1 of the solar cell 2 may be written in place of the reference voltage value VD1 *.
【００５３】自立運転時におけるインバータ回路４の制
御は、図４に示したインバータ制御回路１５によって行
われる。この図４における電圧基準発生回路３６は、交
流電源１３と同じ単相１００Ｖ、５０Ｈｚ（或いは６０
Ｈｚ）に対応した基準交流電圧ＶAC* を生成するもので
ある。また、低電力連系運転時におけるインバータ回路
４の制御は、図１に示したインバータ制御回路５９によ
って行われる。The control of the inverter circuit 4 during the self-sustaining operation is performed by the inverter control circuit 15 shown in FIG. The voltage reference generation circuit 36 in FIG. 4 is the same as the single-phase 100 V, 50 Hz (or 60
Hz) corresponding to the reference AC voltage VAC *. The control of the inverter circuit 4 during the low power interconnection operation is performed by the inverter control circuit 59 shown in FIG.
【００５４】次に、自立運転時及び低電力連系運転時に
おける本実施例の作用について説明する。まず、自立運
転又は低電力連系運転に先立って最大電力点追従制御が
行われているときには、最大電力点検出回路１７から出
力される基準電圧値ＶD1* は、書込制御回路６５によっ
て所定の時間間隔毎にメモリ回路６６に書き込まれる。
電圧基準回路６７は、所定の時間間隔毎にこの書き込ま
れた値を読み出して基準電圧値ＶD1* を生成し、減算回
路１８に対して出力する。従って、直流電源制御回路６
４は、前述した直流電源制御回路５８と同様にして最大
電力点追従制御を行うことができる。Next, the operation of this embodiment during the self-sustaining operation and the low-power interconnection operation will be described. First, when the maximum power point tracking control is performed prior to the self-sustained operation or the low power interconnection operation, the reference voltage value VD1 * output from the maximum power point detection circuit 17 is determined by the write control circuit 65 to a predetermined value. The data is written to the memory circuit 66 at each time interval.
The voltage reference circuit 67 reads out the written value at predetermined time intervals, generates a reference voltage value VD1 *, and outputs it to the subtraction circuit 18. Therefore, the DC power supply control circuit 6
4 can perform the maximum power point tracking control in the same manner as the DC power supply control circuit 58 described above.
【００５５】さて、最大電力点追従制御から自立運転又
は低電力連系運転に切り換えられると、書込制御回路６
５はメモリ回路６６への書き込みを中止する。その結
果、メモリ回路６６は、最大電力点追従制御が終了する
直前の基準電圧値ＶD1* を記憶した状態に保持される。
電圧基準回路６７は、自立運転に切り換わった後も、メ
モリ回路６６に記憶された（最大電力点追従制御が終了
する直前の）一定値の基準電圧値ＶD1* を読み続け、直
流電源制御回路６４は、その基準電圧値ＶD1* に基づい
て直流電源回路３の制御を続行する。その結果、太陽電
池２は、その基準電圧値ＶD1* に対応した一定の動作点
において動作し続ける。When the operation is switched from the maximum power point tracking control to the self-sustaining operation or the low-power interconnection operation, the write control circuit 6
5 stops writing to the memory circuit 66. As a result, the memory circuit 66 is kept in a state in which the reference voltage value VD1 * immediately before the end of the maximum power point tracking control is stored.
The voltage reference circuit 67 continues to read the constant reference voltage value VD1 * (immediately before the end of the maximum power point tracking control) stored in the memory circuit 66 even after the switching to the self-sustained operation. 64 continues the control of the DC power supply circuit 3 based on the reference voltage value VD1 *. As a result, the solar cell 2 continues to operate at a certain operating point corresponding to the reference voltage value VD1 *.
【００５６】前述したように、太陽電池２は、日照状態
が変化すると最大電力点となる出力電圧値ＶD1が若干変
化する。従って、自立運転時又は低電力連系運転時にお
いては、太陽電池２から常時最大電力を得ることは難し
い。しかし、その最大電力点の変化は小さいので、上記
一定値の基準電圧値ＶD1* を用いても太陽電池２から最
大電力の９０〜９５％程度の出力を安定して得ることが
できる。As described above, in the solar cell 2, the output voltage value VD1 at the maximum power point slightly changes when the sunshine state changes. Therefore, it is difficult to always obtain the maximum power from the solar cell 2 during the self-sustaining operation or the low-power interconnection operation. However, since the change in the maximum power point is small, an output of about 90 to 95% of the maximum power can be stably obtained from the solar cell 2 even when the reference voltage value VD1 * having the constant value is used.
【００５７】さらに、自立運転中においては、太陽電池
２から出力可能な上記電力（日照状態に応じて刻々変化
する）が負荷の消費電力に対し不足すると交流電圧ＶAC
が低下するが、太陽電池２の動作点が固定されているの
で、直流電源制御回路６４の制御が不安定状態（動作点
が電力低下方向に制御される状態）になることがなく、
負荷が軽減されれば交流電圧ＶACが回復する復帰特性を
持つことができる。Further, during the self-sustaining operation, if the power that can be output from the solar cell 2 (which changes every moment according to the sunshine state) is insufficient for the power consumption of the load, the AC voltage VAC
However, since the operating point of the solar cell 2 is fixed, the control of the DC power supply control circuit 64 does not become unstable (the operating point is controlled in the power decreasing direction),
If the load is reduced, it is possible to have a return characteristic in which the AC voltage VAC recovers.
【００５８】以上述べたように、本実施例によれば、直
流電源制御回路６４は、最大電力点追従制御時の基準電
圧値ＶD1* をメモリ回路６６に記憶するように構成さ
れ、自立運転時及び低電力連系運転時においては、この
メモリ回路６６に記憶された基準電圧値ＶD1* に基づい
て太陽電池２の動作点を決定するように制御する点に特
徴を有する。この場合、日照変化による太陽電池２の最
大電力点の変化は比較的小さいので、自立運転時及び低
電力連系運転時においても、太陽電池２から最大電力の
９０〜９５％程度の出力を安定して得ることができ、従
来の制御回路７による運転と比較して電力の利用率が高
く運転可能範囲が２〜３倍に広がる。As described above, according to the present embodiment, the DC power supply control circuit 64 is configured to store the reference voltage value VD1 * at the time of the maximum power point follow-up control in the memory circuit 66. Also, during low-power interconnection operation, control is performed to determine the operating point of the solar cell 2 based on the reference voltage value VD1 * stored in the memory circuit 66. In this case, since the change in the maximum power point of the solar cell 2 due to the change in sunlight is relatively small, the output of about 90 to 95% of the maximum power from the solar cell 2 is stabilized even during the self-sustaining operation and the low-power interconnection operation. As compared with the operation by the conventional control circuit 7, the power utilization rate is high and the operable range is expanded to two to three times.
【００５９】また、自立運転時においては、一時的に負
荷が増加しても運転を継続することが可能となり、さら
に低電力連系運転時においては、太陽電池２から得られ
る電力を制限することなく全て系統に送出することが可
能となる。Further, in the independent operation, the operation can be continued even if the load temporarily increases, and in the low power interconnection operation, the power obtained from the solar cell 2 is limited. And it can be sent to all systems.
【００６０】なお、本発明は上記し且つ図面に示す実施
例に限定されるものではなく、以下のような拡張または
変更が可能である。第２の実施例において、最大電力点
追従制御時には基準電圧値ＶD1* をメモリ回路６６を介
さず直接減算回路１８に入力するようにし、最大電力点
追従制御が終了する時点でその時の基準電圧値ＶD1* を
メモリ回路６６に記憶するように構成しても良い。The present invention is not limited to the embodiment described above and shown in the drawings, but can be extended or modified as follows. In the second embodiment, at the time of the maximum power point tracking control, the reference voltage value VD1 * is directly input to the subtraction circuit 18 without passing through the memory circuit 66. When the maximum power point tracking control ends, the reference voltage value at that time is ended. VD1 * may be stored in the memory circuit 66.
【００６１】直流電源回路３は、昇圧チョッパ回路に限
らず、降圧チョッパ回路や、変圧器（例えば高周波トラ
ンス）を用いた昇圧・降圧チョッパ回路であっても良
い。また、交流電源１３が三相の場合には、インバータ
制御回路５９は、三相電力を有効電力と無効電力に分け
て直流分として制御した後、三相のＰＷＭ制御を行う構
成とすることができる。The DC power supply circuit 3 is not limited to a step-up chopper circuit, but may be a step-down chopper circuit or a step-up / step-down chopper circuit using a transformer (for example, a high-frequency transformer). When the AC power supply 13 is three-phase, the inverter control circuit 59 may perform a three-phase PWM control after controlling the three-phase power into DC power by dividing the three-phase power into active power and reactive power. it can.
【００６２】[0062]
【発明の効果】以上の説明によって明らかなように、請
求項１の発明では、太陽電池の動作点を決める直流電源
回路の制御において、直流電源回路の出力電圧値と所定
の制限電圧値との差分に基づいて電流マイナーループに
おける基準電流値を制限するように構成したので、太陽
電池の動作点を不連続に変化させることなく安定した状
態で太陽電池の出力を制限可能となる。As is apparent from the above description, according to the first aspect of the present invention, in controlling the DC power supply circuit for determining the operating point of the solar cell, the output voltage value of the DC power supply circuit and the predetermined limit voltage value are controlled. Since the configuration is such that the reference current value in the current minor loop is limited based on the difference, it is possible to limit the output of the solar cell in a stable state without discontinuously changing the operating point of the solar cell.
【００６３】請求項３の発明では、最大電力点追従制御
時における基準電圧値を記憶する記憶手段を設け、制御
手段は、その記憶された基準電圧値を用いて直流電源回
路を制御するよう構成したので、天候状態や運転モード
によらず常に太陽電池の出力を最大電力に近い値に制御
可能となる。According to a third aspect of the present invention, there is provided storage means for storing a reference voltage value at the time of maximum power point tracking control, and the control means controls the DC power supply circuit using the stored reference voltage value. Therefore, the output of the solar cell can always be controlled to a value close to the maximum power regardless of the weather condition or the operation mode.
【００６４】請求項４の発明では、太陽電池の出力電力
と直流電源回路の出力電圧値及び基準電圧値に基づく電
力補正値との和が交流出力電力と一致するようにインバ
ータ回路を制御するので、インバータ制御の応答性が向
上し、日照状態の急変時においても直流電源回路の出力
電圧を安定化できる。従って、太陽電池の基準電流が制
限されることが少なくなり、安定した電力制御（特に最
大電力点追従制御）を行うことができる。According to the present invention, the inverter circuit is controlled so that the sum of the output power of the solar cell and the output voltage value of the DC power supply circuit and the power correction value based on the reference voltage value coincides with the AC output power. In addition, the responsiveness of the inverter control is improved, and the output voltage of the DC power supply circuit can be stabilized even when the sunshine condition changes suddenly. Therefore, the reference current of the solar cell is less restricted, and stable power control (particularly, maximum power point tracking control) can be performed.
【図１】本発明の第１の実施例を示す太陽光発電インバ
ータ装置の電気的構成図FIG. 1 is an electrical configuration diagram of a photovoltaic power generation inverter device according to a first embodiment of the present invention.
【図２】本発明の第２の実施例を示す直流電源制御回路
のブロック図FIG. 2 is a block diagram of a DC power supply control circuit showing a second embodiment of the present invention.
【図３】従来構成を示す図１相当図FIG. 3 is a diagram corresponding to FIG. 1 showing a conventional configuration.
【図４】自立運転時における制御回路のブロック図FIG. 4 is a block diagram of a control circuit during self-sustaining operation.
【図５】低出力連系運転時における制御回路のブロック
図FIG. 5 is a block diagram of a control circuit at the time of low output interconnection operation.
【図６】太陽電池の出力特性図FIG. 6 is an output characteristic diagram of a solar cell.
１、３８は太陽光発電インバータ装置、２は太陽電池、
３は直流電源回路、４はインバータ回路、７、３９は制
御回路（制御手段）、１４、５８、６４は直流電源制御
回路、１５、５９はインバータ制御回路、６６はメモリ
回路（記憶手段）である。1, 38 is a solar power generation inverter device, 2 is a solar cell,
3 is a DC power supply circuit, 4 is an inverter circuit, 7 and 39 are control circuits (control means), 14, 58 and 64 are DC power control circuits, 15 and 59 are inverter control circuits, and 66 is a memory circuit (storage means). is there.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 秦野 幸彦 三重県三重郡朝日町大字繩生2121番地 株 式会社東芝三重工場内 Ｆターム(参考） 5G066 HA30 HB06 5H420 BB02 BB03 BB12 BB14 CC03 DD03 DD10 EA10 EA45 EB04 EB09 EB39 FF03 FF04 FF22 FF25 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yukihiko Hatano 2121 Nao, Asahimachi, Mie-gun, Mie Prefecture F-term in the Toshiba Mie Plant (reference) 5G066 HA30 HB06 5H420 BB02 BB03 BB12 BB14 CC03 DD03 DD10 EA10 EA45 EB04 EB09 EB39 FF03 FF04 FF22 FF25
Claims (6)
ベルを変換する直流電源回路と、この直流電源回路の出
力電圧を交流電圧に変換するインバータ回路と、前記太
陽電池の出力電力を前記インバータ回路の交流出力電力
に変換するように前記直流電源回路及びインバータ回路
を制御する制御手段とを備えた太陽光発電インバータ装
置において、 前記制御手段は、前記太陽電池の出力電圧値と当該太陽
電池に対する所定の基準電圧値との電圧偏差に基づいて
当該太陽電池に対する基準電流値を求めるとともに、前
記直流電源回路の出力電圧値と当該直流電源回路に対す
る所定の制限電圧値との電圧偏差に基づいて前記基準電
流値を制限し、この制限された基準電流値と前記太陽電
池の出力電流値が一致するように前記直流電源回路を制
御することを特徴とする太陽光発電インバータ装置。1. A solar cell, a DC power supply circuit for converting an output voltage level of the solar cell, an inverter circuit for converting an output voltage of the DC power supply circuit to an AC voltage, and an inverter for converting an output power of the solar cell to the inverter. A photovoltaic power generation inverter device comprising: a control unit that controls the DC power supply circuit and the inverter circuit so as to convert the DC power into AC output power of a circuit. A reference current value for the solar cell is determined based on a voltage deviation from a predetermined reference voltage value, and based on a voltage deviation between an output voltage value of the DC power supply circuit and a predetermined limit voltage value for the DC power supply circuit. A reference current value is limited, and the DC power supply circuit is controlled such that the limited reference current value matches the output current value of the solar cell. Photovoltaic inverter apparatus characterized by.
となるように当該太陽電池に対する基準電圧値を決定す
ることを特徴とする請求項１記載の太陽光発電インバー
タ装置。2. The photovoltaic power generation inverter device according to claim 1, wherein the control means determines a reference voltage value for the solar cell so that the output power of the solar cell becomes maximum.
決定された当該太陽電池に対する基準電圧値を記憶する
記憶手段を備え、制御手段は、その記憶手段に記憶され
た基準電圧値を用いて直流電源回路を制御することを特
徴とする請求項１記載の太陽光発電インバータ装置。3. A storage unit for storing a reference voltage value for the solar cell determined to maximize the output power of the solar cell, wherein the control unit uses the reference voltage value stored in the storage unit. 2. The photovoltaic power generation inverter device according to claim 1, wherein the direct current power supply circuit is controlled by the power generation device.
は基準電圧値と当該太陽電池の出力電流値または基準電
流値との積から当該太陽電池の出力電力を求めるととも
に、直流電源回路の出力電圧値と当該直流電源回路に対
する所定の基準電圧値との電圧偏差に応じた電力補正値
を求め、これら出力電力と電力補正値との和が交流出力
電力と一致するようにインバータ回路を制御することを
特徴とする請求項１乃至３の何れかに記載の太陽光発電
インバータ装置。4. The control means obtains the output power of the solar cell from a product of the output voltage value or the reference voltage value of the solar cell and the output current value or the reference current value of the solar cell, and outputs the output power of the DC power supply circuit. A power correction value corresponding to a voltage deviation between the voltage value and a predetermined reference voltage value for the DC power supply circuit is obtained, and the inverter circuit is controlled such that the sum of the output power and the power correction value matches the AC output power. The photovoltaic power generation inverter device according to any one of claims 1 to 3, wherein
補正値との和をインバータ回路の交流電圧値と出力力率
のうち少なくとも交流電圧値で除すことにより当該イン
バータ回路に対する基準交流電流値を求め、この基準交
流電流値と交流電流値が一致するように当該インバータ
回路を制御することを特徴とする請求項４記載の太陽光
発電インバータ装置。5. The control circuit according to claim 5, wherein the control unit divides the sum of the output power of the solar cell and the power correction value by at least the AC voltage value of the AC voltage value and the output power factor of the inverter circuit to thereby obtain a reference AC current for the inverter circuit. 5. The photovoltaic power generation inverter device according to claim 4, wherein a value is obtained, and the inverter circuit is controlled so that the reference AC current value matches the AC current value.
て、当該太陽電池の出力電力に更に直流電源回路及びイ
ンバータ回路の効率を乗じて得た電力を用いて当該イン
バータ回路を制御することを特徴とする請求項４又は５
記載の太陽光発電インバータ装置。6. The control means controls the inverter circuit using power obtained by multiplying the output power of the solar cell by the efficiency of the DC power supply circuit and the inverter circuit, instead of the output power of the solar cell. 6. The method according to claim 4, wherein
The photovoltaic power inverter device as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10184406A JP2000020150A (en) | 1998-06-30 | 1998-06-30 | Solar power generation inverter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10184406A JP2000020150A (en) | 1998-06-30 | 1998-06-30 | Solar power generation inverter device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000020150A true JP2000020150A (en) | 2000-01-21 |
Family
ID=16152621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10184406A Pending JP2000020150A (en) | 1998-06-30 | 1998-06-30 | Solar power generation inverter device |
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| JP (1) | JP2000020150A (en) |
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