JP7317438B2 - Power controller for self-consumption photovoltaic power generation system - Google Patents
Power controller for self-consumption photovoltaic power generation system Download PDFInfo
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- JP7317438B2 JP7317438B2 JP2019046110A JP2019046110A JP7317438B2 JP 7317438 B2 JP7317438 B2 JP 7317438B2 JP 2019046110 A JP2019046110 A JP 2019046110A JP 2019046110 A JP2019046110 A JP 2019046110A JP 7317438 B2 JP7317438 B2 JP 7317438B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
Description
本発明は、電力会社からの受電電力量を抑制した節電効果の高い自家消費型太陽光発電システムの電力制御装置に関する。 TECHNICAL FIELD The present invention relates to a power control device for a self-consumption photovoltaic power generation system that suppresses the amount of power received from a power company and has a high power saving effect.
従来の太陽光発電は、国による固定価格買取制度（ＦＩＴ）により２０年間固定の高い単価で電気を売ることができるため、ＦＩＴ施行以降非常に高い人気が続いていた。 Conventional photovoltaic power generation has been extremely popular since the introduction of the FIT, as electricity can be sold at a fixed high unit price for 20 years under the government's feed-in tariff (FIT) system.
しかしながら、電力会社の買取価格の低下により、新規設置では買取価格は電気料金とほぼ同額、あるいはそれより低下するため、太陽光発電設備に対する投資妙味がなくなりつつある。また、電力会社の出力制御要請により発電した設備からの売電を抑制せざるをえない環境も生じている。 However, due to the decline in the purchase price of electric power companies, the purchase price for new installations is almost the same as or lower than the electricity rate, so the attractiveness of investing in solar power generation equipment is disappearing. In addition, there is an environment in which power companies have to curb the sale of power from equipment that has generated power due to output control requests.
かかる環境の下、太陽光発電設備は、発電した電力を電力会社に売るより自家消費することを目的とした設計が増えつつある。このような自家消費型の設計では、太陽光発電システムから電力会社への電力の逆潮流を防止するように制御することが必要である。 Under such circumstances, more and more photovoltaic power generation facilities are designed for the purpose of self-consumption rather than selling the generated power to electric power companies. Such self-consumption designs require controls to prevent reverse power flow from the photovoltaic system to the utility company.
逆潮流を防止した太陽光発電システムとしては、例えば特許文献１～３が挙げられる。特許文献１では、消費電力量に対する発電電力量の差分値が設定閾値以下となった場合に太陽光発電装置から供給される電力量を所定値まで低減すること、特許文献２では、負荷による消費電力量に対する発電電力量の不足分が閾値以下になった場合に太陽光発電装置から供給される電力量を抑制することが開示されている。しかし、特許文献１，２では、過剰に発電電力を抑制するために発電可能な電力を十分に活用できていない問題がある。 Patent Documents 1 to 3, for example, can be cited as examples of photovoltaic power generation systems that prevent reverse power flow. In Patent Document 1, the amount of power supplied from the photovoltaic power generation device is reduced to a predetermined value when the difference value of the amount of generated power with respect to the amount of power consumed is equal to or less than a set threshold. It is disclosed that the amount of power supplied from the photovoltaic power generation device is suppressed when the amount of power generation that is short of the amount of power falls below a threshold. However, in Patent Literatures 1 and 2, there is a problem that the power that can be generated cannot be fully utilized because the generated power is suppressed excessively.
特許文献１，２のこのような問題を低減するために、特許文献３では、発電電力の上限値を、発電電力の上限値と消費電力との差分が消費電力の一次関数となるように設定して、発電電力がこの上限値以下となるように制御することが開示されている。 In order to reduce such problems of Patent Documents 1 and 2, in Patent Document 3, the upper limit of generated power is set so that the difference between the upper limit of generated power and power consumption is a linear function of power consumption. Then, it is disclosed that the generated power is controlled so as to be equal to or less than this upper limit value.
しかしながら、特許文献３の制御方法では、もっぱら発電電力を特定値以下に低下するように制御することに注力しているため、発電電力が小さいときは電力会社から買電する量が増えるだけであり、また発電電力が負荷電力より大きいときには、逆潮流を防止するために太陽光発電の発電電力の抑制を行なわなければならず、せっかくの発電電力が有効に使えない問題があった。 However, the control method of Patent Document 3 focuses on controlling the generated power so that it falls below a specific value, so when the generated power is small, the amount of power purchased from the power company only increases. Also, when the generated power is greater than the load power, the power generated by the photovoltaic power generation must be suppressed in order to prevent reverse power flow.
本発明は、上記従来技術の問題を解消するために創案されたものであり、その目的は、自家消費電型太陽光発電システムにおいて、電力会社への電力の逆潮流を防止しながら、太陽電池の発電電力の抑制を避けて太陽電池の発電効率を高めることができる電力制御装置、及びそれを使用した自家消費型太陽電池システムを提供することにある。 The present invention was invented to solve the above-described problems of the prior art. To provide a power control device capable of increasing the power generation efficiency of a solar cell by avoiding suppression of the generated power, and a self-consumption solar cell system using the same.
本発明者は、上記目的を達成するために鋭意検討した結果、逆潮流を防止するために発電電力を抑制するように制御するのではなく、発電電力が少ない場合に負荷による消費電力を抑制し、発電電力が多い場合に負荷による消費電力を高めるように制御することによって発電電力の効率を従来より高めることができることを見出し、本発明の完成に至った。 As a result of intensive studies to achieve the above object, the present inventors have found that power consumption by the load is suppressed when the generated power is low, rather than controlling to suppress the generated power in order to prevent reverse power flow. Furthermore, the inventors have found that the efficiency of generated power can be increased more than before by controlling the power consumption by the load to increase when the generated power is large, and have completed the present invention.
即ち、本発明は、以下の（１）～（９）の構成を有するものである。
（１）太陽光発電設備からの発電電力と電力会社からの受電電力とによって負荷による消費電力を賄う自家消費型太陽光発電システムの電力制御装置であって、前記電力制御装置が、前記発電電力、前記受電電力、及び前記消費電力の計測データをそれぞれ取得することができる計測データ取得部と、前記計測データ取得部による発電電力、受電電力、及び消費電力の計測データ結果に基づいて発電電力、受電電力、又は消費電力を変更することができる制御部とを含み、前記制御部は、電力会社への電力の逆潮流を防止するために受電電力＝負荷による消費電力－発電電力≧０の式の条件を満足させながら、計測した発電電力が第一参照値より少ない場合は、負荷による消費電力を抑制するように、計測した発電電力が第二参照値より多い場合は、負荷による消費電力を高めるように制御するように構成され、第一参照値は、第二参照値より低い値で設定されていること、及び負荷が空調設備であり、かつダミー負荷を含まないことを特徴とする電力制御装置。
（２）第一参照値が、太陽光発電設備の定格発電量の１０％以上９０％以下の範囲の値であることを特徴とする（１）に記載の電力制御装置。
（３）第二参照値が、太陽光発電設備の定格発電量の７０％超９５％以下の範囲の値であることを特徴とする（１）又は（２）に記載の電力制御装置。
（４）（１）に記載の条件式中の負荷による消費電力が、実際の計測結果より消費電力の一定の変動幅を控除した値であることを特徴とする（１）～（３）のいずれかに記載の電力制御装置。
（５）消費電力の一定の変動幅が消費電力の計測結果の１～１０％であることを特徴とする（４）に記載の電力制御装置。
（６）制御部が、発電電力を太陽光発電設備の定格発電量の１００％未満から０％までの範囲で抑制することができるように構成されていることを特徴とする（１）～（５）のいずれかに記載の電力制御装置。
（７）計測データ取得部による発電電力、受電電力、及び消費電力の計測間隔が１～６０秒であることを特徴とする（１）～（６）のいずれかに記載の電力制御装置。
（８）計測データ取得部による発電電力、受電電力、及び消費電力の計測間隔が３～２０秒であることを特徴とする（１）～（７）のいずれかに記載の電力制御装置。
（９）（１）～（８）のいずれかに記載の電力制御装置を含むことを特徴とする自家消費型太陽光発電システム。
That is, the present invention has the following configurations (1) to ( 9 ).
(1) A power control device for a self-consumption type photovoltaic power generation system in which power consumption by a load is covered by power generated from a photovoltaic power generation facility and power received from a power company, wherein the power control device controls the generated power , a measurement data acquisition unit capable of acquiring measurement data of the received power and the power consumption, and generated power based on the measurement data results of the generated power, the received power, and the power consumption by the measurement data acquisition unit, a controller that can change the received power or the consumed power, and the controller controls the formula of received power = power consumed by the load - generated power ≥ 0 in order to prevent reverse power flow to the power company. If the measured generated power is less than the first reference value while satisfying the conditions of , the power consumption by the load is suppressed, and if the measured generated power is greater than the second reference value, the power consumption by the load is It is configured to control to increase, the first reference value is set at a value lower than the second reference value, and the load is an air conditioner and does not include a dummy load. power controller.
(2) The power control device according to (1), wherein the first reference value is a value in the range of 10% or more and 90% or less of the rated power generation amount of the photovoltaic power generation equipment.
(3) The power control device according to (1) or (2), wherein the second reference value is a value within a range of more than 70% and 95% or less of the rated power generation amount of the photovoltaic power generation facility.
(4) The power consumption by the load in the conditional expression described in (1) is a value obtained by subtracting a certain fluctuation range of the power consumption from the actual measurement result. A power control device according to any one of the preceding claims.
(5) The power control device according to (4), wherein the constant fluctuation range of power consumption is 1 to 10% of the measured power consumption.
(6) The control unit is configured so that the generated power can be suppressed in a range from less than 100% to 0% of the rated power generation of the photovoltaic power generation equipment (1) ~ ( 5) The power control device according to any one of the items.
(7) The power control device according to any one of (1) to (6), wherein the measurement interval of the generated power, received power, and consumed power by the measurement data acquisition unit is 1 to 60 seconds.
(8) The power control device according to any one of (1) to (7), wherein the measurement interval of the generated power, received power, and consumed power by the measurement data acquisition unit is 3 to 20 seconds.
( 9 ) A self-consumption photovoltaic power generation system comprising the power control device according to any one of (1) to ( 8 ).
本発明の電力制御装置は、自家消費型太陽光発電システムにおいて、電力会社への電力の逆潮流を防止するために発電電力を抑制するのではなく、計測した発電電力に応じて負荷の消費電力を増減するように制御しているので、逆潮流の防止を確実にしながら、太陽光発電の発電電力を効率的に利用することができ、電力会社からの買電量を従来より削減することができる。特に、負荷が空調設備による場合、経時的な消費電力の推移が予想されるため、快適性を損わずに発電電力の変化に対応した省エネ性の高い空調制御の実現が可能である。 In a self-consumption solar power generation system, the power control device of the present invention does not suppress the generated power to prevent reverse power flow to the electric power company, but the power consumption of the load according to the measured generated power. is controlled to increase or decrease, it is possible to efficiently use the power generated by photovoltaic power generation while ensuring the prevention of reverse power flow, and reduce the amount of power purchased from the power company compared to before. . In particular, when the load is air-conditioning equipment, power consumption is expected to change over time, so it is possible to realize air-conditioning control with high energy efficiency that responds to changes in generated power without impairing comfort.
本発明の電力制御装置及びそれを使用した太陽光発電システムの実施形態の一例について図面を参照して説明するが、本発明は、これらに限定されるものではない。 An example of an embodiment of a power control device of the present invention and a photovoltaic power generation system using the same will be described with reference to the drawings, but the present invention is not limited thereto.
本発明の電力制御装置は、逆潮流を防止するために基本的に負荷による消費電力を制御するという新規な制御方法を使用することを除けば、従来公知のものと基本的に同じものを採用することができる。また、本発明の電力制御装置を使用して制御される太陽光発電システム本体は、それ自体、基本的に従来公知のものを採用することができる。 The power control apparatus of the present invention is basically the same as the conventionally known one, except that it uses a new control method of basically controlling the power consumption by the load to prevent reverse power flow. can do. Further, the main body of the photovoltaic power generation system controlled by using the power control device of the present invention itself can basically adopt a conventionally known one.
図１は、本発明の電力制御装置を使用した自家消費型太陽光発電システムの一例を概略的に示したものである。図１に示されるように、本発明の太陽光発電システム１は、太陽光発電設備２からの発電電力２Ａと、電力会社３からの受電電力３Ａと、任意選択的に蓄電池からの供給電力（図示せず）とによって負荷４による消費電力４Ａを賄う自家消費型太陽光発電システムである。本発明の太陽光発電システム１は、本発明の電力制御装置を使用して前述の各電力を制御することができるように構成されている。図１の太陽光発電システム１では、建造物の屋上に太陽光発電設備２が設置され、負荷電力４Ａを要求するものとして建造物内の空調設備５を含む負荷４が示されている。 FIG. 1 schematically shows an example of a self-consumption photovoltaic power generation system using the power control device of the present invention. As shown in FIG. 1, the photovoltaic power generation system 1 of the present invention includes generated power 2A from a photovoltaic power generation facility 2, received power 3A from an electric power company 3, and optionally supplied power from a storage battery ( (not shown) to cover the power consumption of 4A by the load 4. The photovoltaic power generation system 1 of the present invention is configured to be able to control each power described above using the power control device of the present invention. In the photovoltaic power generation system 1 of FIG. 1, a photovoltaic power generation facility 2 is installed on the roof of a building, and a load 4 including an air conditioning facility 5 in the building is shown as requiring load power of 4A.
太陽光発電システム１では、電力会社３の系統電力網から電力３Ａが受電されて分電盤９に送られる。このときの受電電力３Ａは、例えばスマートメーター８によって計測される。また、太陽光発電設備２で発電した電力は、直流電力で出力され、パワーコンディショナー（図示せず）によって交流電力に変換され、発電電力２Ａとして分電盤９に送られる。分電盤９に集められた受電電力３Ａ及び発電電力２Ａは、合わせて負荷４に送られ、消費電力４Ａとして使用される。 In the photovoltaic power generation system 1 , electric power 3 A is received from the system power network of the electric power company 3 and sent to the distribution board 9 . The received power 3A at this time is measured by the smart meter 8, for example. The power generated by the photovoltaic power generation facility 2 is output as DC power, converted to AC power by a power conditioner (not shown), and sent to the distribution board 9 as generated power 2A. The received power 3A and the generated power 2A collected in the distribution board 9 are sent together to the load 4 and used as the consumed power 4A.
本発明の電力制御装置は、太陽光発電設備２からの発電電力２Ａ、電力会社３からの受電電力３Ａ、負荷４による消費電力４Ａの計測データをそれぞれ取得することができる計測データ取得部６と、それらの計測データ結果に基づいて発電電力２Ａ、受電電力３Ａ、消費電力４Ａを変更することができる制御部７とを含む。計測データ取得部６は、それ自体、各電力を計測するものでなくてもよく、各電力の計測データを取得することができれば十分である。計測データ取得部６で取得された計測データは、例えばインターネット１０を介してクラウドサーバー１１に送ることができ、制御部７は、そこから計測データを与えられることができる。制御部７は、計測データ取得部６と一体的に設けられてもよいし、計測データ取得部６から離れて設けられてもよい。また、制御部７は、パワーコンディショナーの中に一体的に設けられてもよいし、パワーコンディショナーとは別に設けられてもよい。 The power control device of the present invention includes a measurement data acquisition unit 6 that can acquire measurement data of 2A of power generated from the solar power generation facility 2, 3A of power received from the power company 3, and 4A of power consumed by the load 4. , and a control unit 7 that can change the generated power 2A, the received power 3A, and the consumed power 4A based on the measurement data results thereof. The measurement data acquisition unit 6 itself does not have to measure each power, and it is sufficient if it can acquire the measurement data of each power. The measurement data acquired by the measurement data acquisition unit 6 can be sent to the cloud server 11 via, for example, the Internet 10, and the control unit 7 can receive the measurement data therefrom. The control unit 7 may be provided integrally with the measurement data acquisition unit 6 or may be provided separately from the measurement data acquisition unit 6 . Also, the control unit 7 may be provided integrally in the power conditioner, or may be provided separately from the power conditioner.
制御部７は、太陽光発電設備２での発電電力２Ａが負荷による消費電力４Ａより大きくなって電力会社３の系統電力網に発電電力２Ａが逆潮流することを防止するために受電電力＝負荷による消費電力－発電電力≧０の式の条件を満足するように制御する。制御部７は、発電電力を太陽光発電設備の最大発電量（定格発電量）の１００％未満から０％までの範囲で抑制することができる。条件式中の負荷による消費電力は、負荷の消費電力の変動がある程度見込まれることから、変動マージンとして実際の計測した消費電力より消費電力の一定の変動幅を控除した値であることが好ましい。この場合、消費電力の一定の変動幅は、消費電力の計測結果の１～１０％に設定することが好ましい。また、制御部７は、負荷による消費電力が、例えば負荷が空調設備のように一日の中での消費電力の増減のスケジュールを予想できる場合には、予め決められた時間推移のスケジュールの値に基づく条件式も満足させることができることが好ましい。 In order to prevent the generated power 2A from the photovoltaic power generation equipment 2 from flowing in reverse to the system power grid of the electric power company 3 when the generated power 2A at the photovoltaic power generation facility 2 becomes larger than the power consumption 4A by the load, the control unit 7 controls the received power=depending on the load. Control is performed so as to satisfy the condition of the formula of power consumption−generated power≧0. The control unit 7 can suppress the generated power within a range from less than 100% to 0% of the maximum power generation (rated power generation) of the photovoltaic power generation equipment. The power consumption due to the load in the conditional expression is expected to fluctuate to some extent in the power consumption of the load, so it is preferable that it is a value obtained by subtracting a certain fluctuation range of the power consumption from the actually measured power consumption as a fluctuation margin. In this case, it is preferable to set the constant fluctuation range of power consumption to 1 to 10% of the measured power consumption. In addition, if the power consumption by the load can be predicted to increase or decrease in a day, such as when the load is an air conditioner, the control unit 7 determines a predetermined time transition schedule value. It is preferable that the conditional expression based on can also be satisfied.
本発明の電力制御装置では、制御部７が、上述のように逆潮流を防止するために上記の式の条件を満足させながら、さらに、計測した発電電力が第一参照値より少ない場合は、負荷による消費電力を抑制するように、計測した発電電力が第二参照値より多い場合は、負荷による消費電力を高めるように制御するように構成されていることが大きな特徴である。従来の装置では、もっぱら発電電力を抑制することにより逆潮流を防止していたが、本発明の装置では、制御部で積極的に負荷の消費電力を増減して制御することが特徴である。特に発電電力が少ない場合に消費電力を制御して受電電力を減少することにより節電を図ることができ、発電電力が多い場合に消費電力を高めることにより逆潮流を有効に防止することができる。ここで第一参照値とは、太陽光発電設備の定格発電量の１０％以上９０％以下、さらには１０％以上８０％以下、さらには１０％以上７０％以下の範囲の値であることができる。また、第二参照値とは、太陽光発電設備の定格発電量の７０％超９５％以下、さらには８０％超９５％以下、さらには８５％超９５％以下の範囲の値であることができる。但し、上述の判断時に基準となる第一参照値は、第二参照値より低い値で設定されることが好ましい。 In the power control device of the present invention, while the control unit 7 satisfies the conditions of the above formula to prevent reverse power flow as described above, when the measured generated power is less than the first reference value, A significant feature is that, when the measured generated power is greater than the second reference value, control is performed to increase the power consumption by the load so as to suppress the power consumption by the load. In the conventional device, the reverse power flow was prevented by suppressing the generated power, but in the device of the present invention, the control section actively controls the power consumption of the load by increasing or decreasing it. In particular, when the generated power is small, the power consumption can be controlled to reduce the received power, thereby saving power, and when the generated power is large, the reverse power flow can be effectively prevented by increasing the power consumption. Here, the first reference value is a value in the range of 10% to 90%, further 10% to 80%, further 10% to 70% of the rated power generation of the photovoltaic power generation facility. can. In addition, the second reference value is a value in the range of more than 70% to 95%, more than 80% to 95%, further more than 85% to 95% of the rated power generation of the photovoltaic power generation facility. can. However, it is preferable that the first reference value, which is used as a reference for the above determination, be set to a value lower than the second reference value.
本発明の電力制御装置では、原則として発電電力を抑制するように制御していないので、発電電力を有効に活用することができ、従来の電力制御装置より太陽光発電設備の発電効率が極めて高いメリットがある。一方、負荷の消費電力を増減することによって負荷に対して生じるデメリットは、一日の中での負荷のきめ細かい使用状況の設定で軽減することができる。負荷の快適性を損わずにこのデメリットを軽減するには、負荷が空調設備からのものを含むことが好ましい。空調設備の場合、人がいないところでの強めの冷房を緩和したり、気温が上がった場合に当初の設定温度を上げて快適性を向上したりするなどの細かい制御と組み合わせることができ、負荷の快適性を損わずに省エネ性を効率的に高めることができる。 In principle, the power control device of the present invention does not control to suppress the generated power, so the generated power can be effectively used, and the power generation efficiency of the photovoltaic power generation facility is extremely high compared to the conventional power control device. There are merits. On the other hand, the demerit caused to the load by increasing or decreasing the power consumption of the load can be reduced by setting detailed usage conditions of the load during the day. To mitigate this disadvantage without compromising load comfort, it is preferred that the load include that from the air conditioner. In the case of air-conditioning equipment, it can be combined with detailed control, such as easing strong cooling in places where there are no people, or raising the initial set temperature to improve comfort when the temperature rises. Energy efficiency can be efficiently improved without impairing comfort.
計測した発電電力が第一参照値より少ないかどうか、そして計測した発電電力が第二参照値より多いかどうかの制御部７の判断は、計測データ取得部６による発電電力、受電電力、及び消費電力の計測間隔ごとに行なわれることが好ましい。連続的に計測する場合は、判断を連続的に間欠的に行なうことができる。間欠的に計測する場合は、判断を計測間隔ごとに間欠的に行なうことができる。この場合、計測間隔は、１～６０秒、さらには３～２０秒、さらには４～１５秒であることができる。 The determination by the control unit 7 as to whether the measured generated power is less than the first reference value and whether the measured generated power is greater than the second reference value is based on the generated power, the received power, and the consumption by the measurement data acquisition unit 6. It is preferable that the measurement is performed at each power measurement interval. If measured continuously, the determination can be made continuously and intermittently. In the case of intermittent measurement, determination can be made intermittently at each measurement interval. In this case, the measurement interval can be 1-60 seconds, furthermore 3-20 seconds, furthermore 4-15 seconds.
図２は、本発明の電力制御装置を使用した自家消費型太陽光発電システムにおける節電効果を従来設備と比較した節電シミュレーションの結果を経時的にグラフで示したものである。図２からわかるように、本発明設備では、計測した発電電力が特定の値より少ない場合（１２：００前後以外の作業時）は負荷による消費電力を抑制する制御がなされるため、消費電力が従来設備より低くなり、その結果、電力会社からの買電量（受電電力）についても本発明設備が従来設備より少なくなっている。従って、発電電力に応じて消費電力を抑制できるように制御される本発明設備は、従来設備より省エネ効果が高いと言える。一方、本発明設備では、計測した発電電力が多いために消費電力を超える場合（１２：００前後の昼食時）は、消費電力を高める制御がなされて逆潮流が防止されるが、従来設備では、発電電力を抑制する制御がなされている。 FIG. 2 is a graph showing the results of a power saving simulation over time comparing the power saving effect in a self-consumption photovoltaic power generation system using the power control device of the present invention with conventional equipment. As can be seen from FIG. 2, in the equipment of the present invention, when the measured generated power is less than a specific value (during work other than around 12:00), control is performed to suppress the power consumption by the load. As a result, the amount of power purchased (receiving power) from the electric power company is also less in the equipment of the present invention than in the conventional equipment. Therefore, it can be said that the equipment of the present invention, which is controlled so as to suppress the power consumption according to the generated power, has a higher energy-saving effect than the conventional equipment. On the other hand, in the equipment of the present invention, when the measured power generation exceeds the power consumption (during lunch around 12:00), control is performed to increase the power consumption to prevent reverse power flow, but in the conventional equipment , is controlled to suppress the generated power.
本発明の電力制御装置は、上述のような構成を採用しているので、太陽光発電設備による発電状況と、負荷によって消費されている電力などを連続的に又は間欠的に計測し、電力会社の系統網への逆潮流を防止する自家消費型太陽光発電に相応しい監視・制御システムと併せて、電力会社からの買電を抑制できる省エネソリューションを提供し、経済性、環境貢献、快適性の全てを満足させることができる。 Since the power control device of the present invention employs the configuration described above, it continuously or intermittently measures the state of power generation by the photovoltaic power generation facility and the power consumed by the load, thereby Together with a monitoring and control system suitable for self-consumption solar power generation that prevents reverse power flow to the grid, we provide an energy-saving solution that can reduce power purchases from electric power companies. can satisfy all.
上述では、本発明の電力制御装置は、負荷による消費電力を、太陽光発電設備からの発電電力と電力会社からの受電電力とによって賄う自家消費型太陽光発電システムにおいて使用するものとして説明してきたが、さらに蓄電池からの供給電力によっても負荷による消費電力を賄うシステムにおいても使用することができる。この場合、電力制御装置の計測データ取得部は、発電電力、受電電力、蓄電池からの供給電力、及び消費電力の計測データをそれぞれ取得し、制御部は、これらの各電力の計測データ結果に基づいて発電電力、受電電力、蓄電池からの供給電力、及び消費電力を変更し、蓄電池への充電電力を変更することができる。制御部は、電力会社への電力の逆潮流を防止するために受電電力＝負荷による消費電力－発電電力－蓄電池からの供給電力＋蓄電池への充電電力≧０の式の条件式を満足させるのに加えて、計測した発電電力が第一参照値より少ない場合は、負荷による消費電力を抑制するか、及び／又は蓄電池による供給電力を生じるように、計測した発電電力が第二参照値より多い場合は、負荷による消費電力を高めるか、及び／又は発電電力から蓄電池への充電電力を生じるように制御するように構成され、第一参照値は、第二参照値より低い値で設定されている。この蓄電池を追加して使用したシステムにおける本発明の電力制御装置の詳細な制御設定は、基本的に前述した説明がそのまま適用されることができる。このシステムでは、逆潮流の防止がさらに確実になるとともに、消費電力の増減が少なくなり、負荷の快適性を向上したうえで発電効率を大幅に高めることができる。このシステムでは、蓄電池は、太陽光発電設備からの発電電力を余剰の場合に蓄電することができ、また蓄電池に蓄電された電力は、余剰の場合に必要により負荷の消費電力として供給することができる。 In the above description, the power control device of the present invention is used in a self-consumption type photovoltaic power generation system in which the power consumption by the load is covered by the power generated by the photovoltaic power generation facility and the power received from the power company. However, it can also be used in a system in which power consumption by the load is also covered by the power supplied from the storage battery. In this case, the measurement data acquisition unit of the power control device acquires the measurement data of the generated power, the received power, the power supplied from the storage battery, and the power consumption, and the control unit acquires the measurement data of each power based on the results of the measurement data. can change the generated power, the received power, the power supplied from the storage battery, and the power consumption, and can change the charging power to the storage battery. In order to prevent reverse power flow to the electric power company, the control unit satisfies the following conditional expression: received power = power consumed by the load - generated power - power supplied from the storage battery + power charged to the storage battery ≥ 0. In addition, if the measured generated power is less than the first reference value, the measured generated power is greater than the second reference value so as to suppress the power consumption by the load and / or cause the power supplied by the storage battery the first reference value is set at a value lower than the second reference value. there is For the detailed control settings of the power control device of the present invention in a system that additionally uses this storage battery, basically the above description can be applied as it is. This system further ensures the prevention of reverse power flow, reduces fluctuations in power consumption, improves load comfort, and significantly increases power generation efficiency. In this system, the storage battery can store the power generated by the photovoltaic power generation equipment in the case of surplus, and the power stored in the storage battery can be supplied as power consumption to the load if necessary in the case of surplus. can.
本発明の電力制御装置は、自家消費型太陽光発電システムにおいて使用すると、電力会社への電力の逆潮流を確実に防止できるとともに太陽電池の発電電力の抑制を避けて太陽電池の発電効率を大幅に高めることができる。また、負荷による消費電力も抑制することができる。従って、本発明の電力制御装置は、ＦＩＴ施行以降の太陽光発電設備の業界において極めて有用である。 When the power control device of the present invention is used in a self-consumption type photovoltaic power generation system, it is possible to reliably prevent the reverse flow of power to the electric power company and to avoid suppression of the power generated by the photovoltaic cells, thereby greatly increasing the power generation efficiency of the photovoltaic cells. can be increased to Also, power consumption by the load can be suppressed. Therefore, the power control device of the present invention is extremely useful in the industry of photovoltaic power generation facilities after the enforcement of FIT.
１ 太陽光発電システム
２ 太陽光発電設備
２Ａ 発電電力
３ 電力会社
３Ａ 受電電力
４ 負荷
４Ａ 消費電力
５ 空調設備
６ 計測データ取得部
７ 制御部
８ スマートメーター
９ 分電盤
１０ インターネット
１１ クラウドサーバー
1 photovoltaic power generation system 2 photovoltaic power generation equipment 2A generated power 3 electric power company 3A received power 4 load 4A power consumption 5 air conditioner 6 measurement data acquisition unit 7 control unit 8 smart meter 9 distribution board 10 internet 11 cloud server
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