JP4253598B2 - Solar power generation system with power storage function - Google Patents

Solar power generation system with power storage function Download PDF

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JP4253598B2
JP4253598B2 JP2004043845A JP2004043845A JP4253598B2 JP 4253598 B2 JP4253598 B2 JP 4253598B2 JP 2004043845 A JP2004043845 A JP 2004043845A JP 2004043845 A JP2004043845 A JP 2004043845A JP 4253598 B2 JP4253598 B2 JP 4253598B2
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誠司 原田
利夫 吉田
喜三郎 服部
勝 清水
一穂 長谷川
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株式会社さとうベネック
株式会社明電舎
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この発明は、電力貯蔵機能を備えた太陽光発電システムに関するものである。   The present invention relates to a photovoltaic power generation system having a power storage function.

図3に示す太陽光発電システムにおいて、昼間には、太陽電池1が発電した直流電力を蓄電池等からなる電力貯蔵手段2に貯蔵するとともに、順逆変換装置3を用いて直流電力を交流電力に変換し、商用系統4と連系してその電力を負荷5に供給し、夜間には、順逆変換装置3を用いて商用系統4からの交流電力を直流電力に変換して電力貯蔵手段2に直流電力を貯蔵するように構成したものである。なお、図中、6〜8は遮断器、9は逆流防止用ダイオード、10は積算電力量計である。   In the solar power generation system shown in FIG. 3, in the daytime, the DC power generated by the solar cell 1 is stored in the power storage means 2 composed of a storage battery or the like, and the DC power is converted into AC power using the forward / reverse conversion device 3. Then, the power is connected to the commercial system 4 and the power is supplied to the load 5, and at night, the AC power from the commercial system 4 is converted into DC power using the forward / reverse conversion device 3, and the power is stored in the power storage means 2. It is configured to store electric power. In the figure, 6 to 8 are circuit breakers, 9 is a backflow prevention diode, and 10 is an integrated watt-hour meter.

上記のように構成された太陽光発電システムにおいては、太陽電池1の発電電力が負荷5の消費電力より小さい時には、発電電力は、すべて負荷5にて消費され、発電電力の不足分は商用系統4から供給される。   In the photovoltaic power generation system configured as described above, when the generated power of the solar cell 1 is smaller than the power consumption of the load 5, all the generated power is consumed by the load 5, and the shortage of the generated power is the commercial system. 4 is supplied.

しかし、発電電力が負荷5の消費電力より大きい時には、余剰電力が発生するので、その余剰電力は、商用系統4に逆潮流電力として供給される手段が採られている。
特開平11−018317号公報 特許第3239106号 特開2002−171674号公報
However, when the generated power is larger than the power consumption of the load 5, surplus power is generated, and therefore, the surplus power is supplied to the commercial system 4 as reverse power flow.
Japanese Patent Laid-Open No. 11-018317 Japanese Patent No. 3239106 JP 2002-171694 A

上述した太陽光発電システムにおいて、余剰電力は、商用系統4に逆潮流電力として供給される手段が採られているが、近年、電力会社の電力料金の関係で、逆潮流電力が太陽電池1で得た発電電力であるのか、電力貯蔵手段2から得た電力であるのかを特定する必要がある.
しかし、従来の太陽光発電システムにおいては、上記逆潮流電力が太陽電池1で得た発電電力であるのか、電力貯蔵手段2から得た電力であるのかが判別できないために、電力料金算定を行なうに当たり困難を極めていた。
In the above-described solar power generation system, means for supplying surplus power to the commercial grid 4 as reverse power flow has been adopted. However, in recent years, the reverse power flow has been reduced by the solar cell 1 due to the power charge of the power company. It is necessary to specify whether the generated power is obtained or the power obtained from the power storage means 2.
However, in the conventional solar power generation system, it is not possible to determine whether the reverse power flow is the power generated by the solar cell 1 or the power obtained from the power storage means 2, so the power rate is calculated. It was extremely difficult.

この発明は、上記の事情に鑑みてなされたもので、逆潮流電力が太陽電池により得た発電電力であるものと明確に特定できるようにするとともに、太陽電池からの発電、電力貯蔵手段の充電放電の自由度を高め、システム効率、製品標準化度を高めた電力貯蔵機能を備えた太陽光発電システムを提供することを課題とする。   The present invention has been made in view of the above circumstances, and makes it possible to clearly specify that the reverse power flow power is generated power from a solar cell, as well as power generation from the solar cell and charging of power storage means. It is an object of the present invention to provide a photovoltaic power generation system having a power storage function that increases the degree of freedom of discharge and increases the system efficiency and the product standardization degree.

この発明は、上記の課題を達成するために、太陽電池と商用系統との間に接続され、負荷に交流電力を供給する逆変換装置と、この逆変換装置の交流出力端と商用系統に一端が接続され、他端が直流電力を貯蔵する電力貯蔵手段に接続された順逆変換装置と、負荷電流と順逆変換装置を流れる電力貯蔵手段からの電流が入力され、後者の電流が前者の電流より大きくならないようにチェックし、判定する差動アンプと、このアンプの判定出力、逆変換装置の出力電流と出力電圧及び順逆変換装置を流れる電流が供給され、これらを演算して逆変換装置と順逆変換装置の電流路に介挿された各別の開閉器を開放する出力を送出する連系保護機能部と、この連系保護機能部の出力が与えられて、前記逆変換装置を制御する第1制御部と、前記差動アンプの判定出力、負荷電流及び連系保護機能部の出力がそれぞれ与えられて演算を行いその値を出力として前記順逆変換装置に与える第2制御部とを有し、
前記第1制御部で制御される前記逆変換装置で太陽光発電出力制御を、
前記第2制御部で制御される前記順逆変換装置で電力貯蔵手段への充電・放電出力制御をそれぞれ同時刻に独立して行うことを特徴とするものである。
In order to achieve the above object, the present invention provides an inverter that is connected between a solar cell and a commercial system and supplies AC power to a load, and an AC output terminal of the inverter and one end of the commercial system. Is connected, and the other end is connected to the power storage means for storing DC power, and the load current and the current from the power storage means flowing through the forward / reverse conversion apparatus are input, the latter current from the former current A differential amplifier for checking and judging not to increase, a judgment output of this amplifier, an output current and output voltage of the inverse conversion device, and a current flowing through the forward / reverse conversion device are supplied, and these are calculated to be forward- reverse with the inverse conversion device. An interconnection protection function unit that outputs an output for opening each other switch inserted in the current path of the conversion device, and an output of the interconnection protection function unit is given to control the inverse conversion device 1 control unit and the differential Amplifier of judgment output, and a second control unit which outputs of the load current and the interconnection protection unit has on the forward and reverse conversion device as an output the value performs calculation given respectively,
Photovoltaic power generation output control by the inverse conversion device controlled by the first control unit,
The forward / reverse conversion device controlled by the second control unit performs charge / discharge output control to the power storage unit independently at the same time .

以上述べたように、この発明によれば、逆潮流電力が発生するエネルギー源は太陽光発電からのみと認識できるように電力貯蔵手段を回路から切り離す構成としたことにより、明確に逆潮流電力発生が太陽光発電からのものと特定できる。また、この発明によれば、太陽電池からの発電、電力貯蔵手段の充電放電の自由度を高め、システム効率、製品標準化度の向上を図ることができる。   As described above, according to the present invention, the power storage means is separated from the circuit so that the energy source for generating the reverse flow power can be recognized only from the photovoltaic power generation, thereby clearly generating the reverse flow power. Can be identified from solar power. Moreover, according to this invention, the freedom degree of the electric power generation from a solar cell and the charge / discharge of an electric power storage means can be raised, and the improvement of system efficiency and a product standardization degree can be aimed at.

以下この発明の実施の形態を図面に基づいて説明するに、図3と同一部分には同一符号を付して述べる。図1はこの発明の実施の第1形態を示す概略構成図で、太陽電池1とパワーコンディショナからなる順逆変換装置3とを結ぶ電路にはチョッパ11を介挿する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same parts as those in FIG. FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention. A chopper 11 is inserted in an electric circuit connecting a solar cell 1 and a forward / reverse conversion device 3 composed of a power conditioner.

また、前記順逆変換装置3と蓄電池等からなる電力貯蔵手段2との電路には、商用系統4の電路に設けられる逆潮流継電器12の動作により開閉制御される開閉器13が介挿されている。なお、14は電磁開閉器である。   In addition, a switch 13 that is controlled to open and close by an operation of a reverse power relay 12 provided in the electric circuit of the commercial system 4 is inserted in an electric circuit between the forward / reverse converter 3 and the power storage unit 2 including a storage battery. . Reference numeral 14 denotes an electromagnetic switch.

上記のように構成された実施の第1形態において、太陽電池1で発電された直流電力は、チョッパ11を介して順逆変換装置3に供給されるとともに、電力貯蔵手段2へも開閉器13を介して供給されている。なお、開閉器13は、通常時は閉成されている。また、チョッパ11は、電力貯蔵手段2の放電状態に応じて直流電圧値が変動するので、その変動に応じて太陽光発電出力を最大限取り出すために設けられている。   In the first embodiment configured as described above, the DC power generated by the solar cell 1 is supplied to the forward / reverse converter 3 via the chopper 11, and the switch 13 is also connected to the power storage means 2. Is supplied through. The switch 13 is normally closed. Moreover, since the DC voltage value fluctuates according to the discharge state of the power storage means 2, the chopper 11 is provided in order to take out the photovoltaic power generation output to the maximum according to the fluctuation.

太陽電池1からの発電電力および電力貯蔵手段2からの合成直流電力が順逆変換装置3を介して交流電力に変換されて負荷5に供給される。   The generated power from the solar cell 1 and the combined DC power from the power storage means 2 are converted into AC power via the forward / reverse converter 3 and supplied to the load 5.

このとき、順逆変換装置3の出力電力は、負荷電流ilと交流電圧Vsを乗算部31で乗算し、有効電力を求め、演算部32に入力する。演算部32は、演算誤差による逆潮流を防ぐため、ゲインを1.0未満とした値を設定として動作する。 At this time, the output power of the forward / reverse conversion device 3 is obtained by multiplying the load current i l and the alternating voltage Vs by the multiplication unit 31 to obtain the effective power, and inputs it to the calculation unit 32. The calculation unit 32 operates by setting a value with a gain less than 1.0 in order to prevent reverse flow due to calculation errors.

この状態で負荷5の使用電力WLOADが減少し、太陽電池1の出力(チョッパ11の出力)WPVが上回った場合(WLOAD<WPV)余剰電力は、電力貯蔵手段2に充電電流として流れる。このため、この充電電流を検出器33で検出した場合、開閉器13を指令部34からの指令で開放する。 In this state, when the power consumption W LOAD of the load 5 decreases and the output of the solar cell 1 (output of the chopper 11) W PV exceeds (W LOAD <W PV ), surplus power is supplied to the power storage means 2 as a charging current. Flowing. For this reason, when this charging current is detected by the detector 33, the switch 13 is opened by a command from the command unit 34.

また、制御装置35の不具合にて、その交流電力が負荷5の消費電力より大きくなった場合には、逆潮流となって商用系統4に逆潮流電力が供給されるようになる。すると、逆潮流継電器12が動作して、その動作信号で開閉器13が開放される。   Further, when the AC power becomes larger than the power consumption of the load 5 due to the malfunction of the control device 35, the reverse power flow is generated and the reverse power flow is supplied to the commercial system 4. Then, the reverse power relay 12 operates and the switch 13 is opened by the operation signal.

この構成とすることにより、逆潮流が発生している間は、逆潮流継電器12が動作しているため、開閉器13の開放により電力貯蔵手段2は、回路より切り離され、太陽電池1のみをエネルギー源とした運転が担保される。   With this configuration, since the reverse power relay 12 is operating while the reverse power flow is occurring, the power storage means 2 is disconnected from the circuit by opening the switch 13, and only the solar cell 1 is connected. Operation as an energy source is guaranteed.

この開閉器13の開放により、電力貯蔵手段2からの直流電力は、順逆変換装置3には供給されなくなる。これにより、逆潮流が更に継続しているならば、開閉器13の開放も継続するため、商用系統4への逆潮流電力は、自然エネルギー源である太陽電池1による太陽光発電だけになることが特定される。このため、逆潮流電力による電力料金算定も確実にできるようになる。   By opening the switch 13, the DC power from the power storage unit 2 is not supplied to the forward / reverse converter 3. As a result, if the reverse flow continues further, the opening of the switch 13 is continued, so that the reverse flow power to the commercial system 4 is only solar power generation by the solar cell 1 which is a natural energy source. Is identified. For this reason, it becomes possible to reliably calculate the electricity rate based on the reverse power flow.

なお、実施の第1形態では、トータル効率を高めるため、太陽光発電の出力を優先する。すなわち、太陽光発電からの出力が有るときは、通常、電力貯蔵手段2への充電を避け(上記においては、電力貯蔵手段2に充電するように記載しているが)、夜間に太陽光発電出力が無いときにだけ、商用系統4から電力貯蔵手段2へ充電するようにしている。   In the first embodiment, priority is given to the output of photovoltaic power generation in order to increase the total efficiency. That is, when there is an output from the solar power generation, the power storage means 2 is usually avoided (in the above description, the power storage means 2 is charged), and the solar power generation is performed at night. The power storage means 2 is charged from the commercial system 4 only when there is no output.

しかし、電力貯蔵手段2の耐久性を維持するために、完全充電が必要であり、夜間だけでは、充電しきれないので、日中、太陽光発電出力が有る時間帯も電力貯蔵手段2に充電しなければならない。このため、実施の第1形態は、システムとしてのトータル効率が多少低下する虞がある。   However, in order to maintain the durability of the power storage means 2, it is necessary to fully charge the battery, and since it cannot be fully charged only at night, the power storage means 2 is charged even during the daytime when solar power output is present. Must. For this reason, in the first embodiment, there is a possibility that the total efficiency of the system is somewhat lowered.

図2はこの発明の実施の第2形態を示す概略構成図で、この実施の第2形態では、パワーコンデショナとして逆変換装置3aと順逆変換装置3bの2台を使用するもので、逆変換装置3aは太陽光発電電力を商用系統4の電力とともに、負荷5に供給するように制御され、順逆変換装置3bは商用電力と電力貯蔵手段2との間で充電、放電に利用するように制御される。   FIG. 2 is a schematic configuration diagram showing a second embodiment of the present invention. In the second embodiment, two inverters 3a and 3b are used as power conditioners. The device 3a is controlled so as to supply the photovoltaic power to the load 5 together with the power of the commercial system 4, and the forward / reverse conversion device 3b is controlled to be used for charging and discharging between the commercial power and the power storage means 2. Is done.

なお、上記制御動作は、逆変換装置3aが制御部21aにより、順逆変換装置3bが制御部21bにより、それぞれ行なわれる。   The control operation is performed by the control unit 21a for the inverse conversion device 3a and the control unit 21b for the forward / reverse conversion device 3b.

22は系統連系のための連系保護機能部で、この連系保護機能部22には、逆変換装置3aの出力電流ip、順逆変換装置3bを流れる電流ibと順逆変換装置3bへの交流電圧Vs及び差動アンプ23の出力が供給される。 Reference numeral 22 denotes an interconnection protection function unit for system interconnection. The interconnection protection function unit 22 includes an output current i p of the reverse conversion device 3a, a current i b flowing through the forward / reverse conversion device 3b, and a forward / reverse conversion device 3b. AC voltage Vs and the output of the differential amplifier 23 are supplied.

連系保護機能部22は、上記各電流、電圧値を演算して能動式単独運転検出用制御機能、過電流保護機能などの共通機能を得て、制御部21a、21bに信号を送って保護機能の共通化を図るようにしている。   The interconnection protection function unit 22 calculates the above current and voltage values to obtain a common function such as an active isolated operation detection control function and an overcurrent protection function, and sends a signal to the control units 21a and 21b for protection. The functions are shared.

差動アンプ23は負荷電流ilと順逆変換装置3bに流れる電流ibを比較し、後者の電流が大きくならないようにチェックするものである。このため、差動アンプ23の比率を設定することにより、負荷電流ilと電力貯蔵手段2からの放電電流ibの比率を変え、正負反転点を調整する。 The differential amplifier 23 compares the load current i 1 and the current i b flowing through the forward / reverse conversion device 3b, and checks that the latter current does not increase. Therefore, by setting the ratio of the differential amplifier 23 changes the ratio of the discharge current i b from the load current i l a power storage unit 2, for adjusting the positive and negative reversal point.

差動アンプ23からの状態信号(電流差、正負信号)出力は、制御部21bと連系保護機能部22に供給される。制御部21bは入力される状態信号と電源電圧とを組み合せた負荷電力演算を行い、その値を出力命令として順逆変換装置3bに送り、電力貯蔵手段2の放電電力を制御することに使用する。   A status signal (current difference, positive / negative signal) output from the differential amplifier 23 is supplied to the control unit 21 b and the interconnection protection function unit 22. The control unit 21b performs a load power calculation combining the input status signal and the power supply voltage, sends the value as an output command to the forward / reverse conversion device 3b, and is used to control the discharge power of the power storage means 2.

連系保護機能部22としては、太陽電池1、電力貯蔵手段2からの過電流監視や制御停止命令で、電磁開閉器14、24の開放を行なったり、単独運転検出のための能動式制御命令(無効電力などの変動量設定)送出をしたり、電磁開閉器24の開放条件確認、成立時の開放指令送出などを行なう。この他、連系保護機能として、保護制御、連系保護用制御量設定など逆変換装置3a、順逆変換装置3bの系統連系に関する共通管理、制御を行なう。   As the interconnection protection function unit 22, the electromagnetic switches 14 and 24 are opened by an overcurrent monitoring or control stop command from the solar cell 1 or the power storage unit 2, or an active control command for detecting an independent operation (Variable amount setting such as reactive power) is sent, the opening condition of the electromagnetic switch 24 is confirmed, and the opening command is sent when established. In addition, as the interconnection protection function, common management and control related to the grid interconnection of the reverse conversion device 3a and the forward / reverse conversion device 3b, such as protection control and connection protection control amount setting, are performed.

この実施の第2形態では、逆変換装置3a、順逆変換装置3bが互いに独立しているので、一方の逆変換装置3aは太陽光発電出力制御を、他方の順逆変換装置3bは電力貯蔵手段2への充電・放電出力制御をそれぞれ同時刻に独立して行なうことが可能となる。   In the second embodiment, since the reverse conversion device 3a and the forward / reverse conversion device 3b are independent of each other, one reverse conversion device 3a performs the photovoltaic power generation output control, and the other forward / reverse conversion device 3b uses the power storage means 2. It becomes possible to independently perform charge / discharge output control to the same time.

このように、第2形態では、逆変換装置3aとして太陽光発電用標準インバータを、順逆変換装置3bとして電池(電力貯蔵手段)充電用標準インバータを適用できるので、量産、コストメリットが得られる。   Thus, in the second embodiment, a standard inverter for photovoltaic power generation can be applied as the reverse conversion device 3a, and a standard inverter for battery (power storage means) charging can be applied as the forward / reverse conversion device 3b, so that mass production and cost merit can be obtained.

上記構成の第2形態では、日中、太陽電池1による太陽光発電出力がある時、その出力は、負荷5に逆変装置3aを通して供給されると共に、電力貯蔵手段2からも順逆変換装置3bを通して、負荷5に供給される。   In the second form of the above configuration, when there is a solar power generation output by the solar cell 1 during the day, the output is supplied to the load 5 through the reverse transformation device 3a and the forward / reverse conversion device 3b from the power storage means 2 as well. And supplied to the load 5.

このとき、電力貯蔵手段2からの出力は、負荷電力と電力貯蔵手段2の電力とを比較して常に、負荷電力以上は、電力貯蔵手段2より供給しないようにする。すなわち、電力貯蔵手段2からの逆潮流が生じないようにする。   At this time, the output from the power storage means 2 always compares the load power with the power stored in the power storage means 2 so that the power storage means 2 does not supply more than the load power. That is, reverse power flow from the power storage means 2 is prevented from occurring.

ここで、逆潮流時と電力料金計量について以下若干補足する。太陽光発電出力からの電力は逆潮流時に、発電電力として電力料金を計量しても良いが、商用系統から電力貯蔵手段2に充電した電力が逆潮流しているときは、発電電力として電力料金を計量することは好ましくない。   Here, a few supplements will be made regarding reverse power flow and electricity rate measurement. The electric power from the photovoltaic power generation output may be measured as a generated power during reverse power flow, but when the power charged in the power storage means 2 from the commercial system is flowing in reverse power, It is not preferable to weigh.

そこで、その状況を確認して、電力貯蔵手段2からの出力を停止し、電力料金を計量する。このため、順逆変換装置3bの電路に介挿されている電磁開閉器24を開放して電力料金計量の誤りを防止する手段として、次の2段階にて行なう。   Therefore, the situation is confirmed, the output from the power storage means 2 is stopped, and the power charge is measured. For this reason, the following two steps are performed as means for preventing an error in power charge measurement by opening the electromagnetic switch 24 inserted in the electric path of the forward / reverse conversion device 3b.

(a)負荷電流と電力貯蔵手段2からの電流との差が正でなくなったとき(即ち、負荷電力より電力貯蔵手段2の電力が大きくなったとき)、電磁開閉器24を開放する(電力貯蔵手段からの放電が負荷電流を上まわったら開放する)。 (A) when the difference between the current from the load current and the power storage unit 2 is no longer positive (i.e., when the power of the power storage unit 2 from the load power is increased), it opens the electromagnetic switch 24 ( It opens when the discharge from the power storage means exceeds the load current).

(b)電磁開閉器14がOFFの状態において、商用系統4への電源電流がマイナス(逆潮流)となった時、電磁開閉器24を開放する。   (B) In the state where the electromagnetic switch 14 is OFF, when the power supply current to the commercial system 4 becomes negative (reverse power flow), the electromagnetic switch 24 is opened.

上記第1形態は、計画システムや容量が小型の場合、コスト優先の場合に適する。第2形態は太陽光発電電力、電力貯蔵手段とも電力容量が大きい場合に適する。即ち、第2形態では、逆変換装置3a、順逆変換装置3bを個別に設置することで、(1)標準ユニット適用によるコストメリット、(2)制御の自由度、そして(3)太陽光からの電力優先取得というメリットが得られる。   The first form is suitable when the plan system and capacity are small, and when cost is a priority. The second form is suitable when both the photovoltaic power generation and the power storage means have a large power capacity. That is, in the second embodiment, by installing the inverse conversion device 3a and the forward / reverse conversion device 3b separately, (1) cost merit by applying the standard unit, (2) freedom of control, and (3) from sunlight The advantage of power priority acquisition is obtained.

この発明の実施の第1形態を示す概略構成図。BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram which shows 1st Embodiment of this invention. この発明の実施の第2形態を示す概略構成図。The schematic block diagram which shows 2nd Embodiment of this invention. 従来の太陽光発電システムの概略構成図。The schematic block diagram of the conventional solar power generation system.

符号の説明Explanation of symbols

1…太陽電池
2…電力貯蔵手段
3,3b…順逆変換装置
3a…逆変換装置
4…商用系統
5…負荷
11…チョッパ
12…逆潮流継電器
13…開閉器
14,24…電磁開閉器
21a,21b…制御部
22…連系保護機能部
23…差動アンプ
DESCRIPTION OF SYMBOLS 1 ... Solar cell 2 ... Electric power storage means 3, 3b ... Forward / reverse conversion device 3a ... Reverse conversion device 4 ... Commercial system 5 ... Load 11 ... Chopper 12 ... Reverse power relay 13 ... Switch 14, 24 ... Electromagnetic switch 21a, 21b ... Control part 22 ... Interconnection protection function part 23 ... Differential amplifier

Claims (1)

  1. 太陽電池と商用系統との間に接続され、負荷に交流電力を供給する逆変換装置と、
    この逆変換装置の交流出力端と商用系統に一端が接続され、他端が直流電力を貯蔵する電力貯蔵手段に接続された順逆変換装置と、
    負荷電流と順逆変換装置を流れる電力貯蔵手段からの電流が入力され、後者の電流が前者の電流より大きくならないようにチェックし、判定する差動アンプと、
    このアンプの判定出力、逆変換装置の出力電流と出力電圧及び順逆変換装置を流れる電流が供給され、これらを演算して逆変換装置と順逆変換装置の電流路に介挿された各別の開閉器を開放する出力を送出する連系保護機能部と、
    この連系保護機能部の出力が与えられて、前記逆変換装置を制御する第1制御部と、
    前記差動アンプの判定出力、負荷電流及び連系保護機能部の出力がそれぞれ与えられて演算を行いその値を出力として前記順逆変換装置に与える第2制御部とを有し、
    前記第1制御部で制御される前記逆変換装置で太陽光発電出力制御を、
    前記第2制御部で制御される前記順逆変換装置で電力貯蔵手段への充電・放電出力制御をそれぞれ同時刻に独立して行うことを特徴とする電力貯蔵機能を備えた太陽光発電システム。
    An inverse converter connected between the solar cell and the commercial system and supplying AC power to the load;
    A forward / reverse conversion device in which one end is connected to the AC output end of this reverse conversion device and a commercial system, and the other end is connected to power storage means for storing DC power;
    A load amplifier and a differential amplifier that receives and inputs the current from the power storage means that flows through the forward / reverse converter and checks that the latter current does not become larger than the former current, and
    The judgment output of this amplifier, the output current and output voltage of the reverse conversion device, and the current flowing through the forward / reverse conversion device are supplied, and these are calculated to be separately opened and closed inserted in the current paths of the reverse conversion device and the forward / reverse conversion device An interconnection protection function unit that sends out output to open the device,
    A first control unit that receives the output of the interconnection protection function unit and controls the inverse conversion device;
    A determination output of the differential amplifier, a load current and an output of the interconnection protection function unit are respectively given, and a calculation is performed, and a second control unit which gives the value to the forward / reverse conversion device as an output;
    Photovoltaic power generation output control by the inverse conversion device controlled by the first control unit,
    A photovoltaic power generation system having a power storage function, wherein the forward / reverse conversion device controlled by the second control unit independently performs charge / discharge output control to the power storage means at the same time .
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