JP5348529B2

JP5348529B2 - Distributed power system

Info

Publication number: JP5348529B2
Application number: JP2008278442A
Authority: JP
Inventors: 茂生沼田; 俊博山根; 英介下田
Original assignee: Shimizu Corp
Current assignee: Shimizu Corp
Priority date: 2008-10-29
Filing date: 2008-10-29
Publication date: 2013-11-20
Anticipated expiration: 2028-10-29
Also published as: JP2010110088A

Abstract

<P>PROBLEM TO BE SOLVED: To provide a distributed power supply system that achieves high-accuracy load-following operation when executing operation control of each distributed power supply. <P>SOLUTION: The distributed power supply system is configured such that a distributed power supply having the highest load-following performance is connected to the vicinity of a connection point with a commercial system in order to reduce a load on the commercial system by integratively controlling a plurality of distributed power supplies each having different following performance with respect to load variations. The distributed power supply system includes a power measuring means for measuring power of a secondary-side position of the connection point, and a control means for controlling output power of the distributed power supply, having the highest load-following performance, on the basis of the power value measured by the power measuring means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、負荷変動に対する追従性能の異なる複数種類の分散型電源を統合的に制御することによって負荷変動補償を行う分散型電源システムに関する。 The present invention relates to a distributed power supply system that performs load fluctuation compensation by comprehensively controlling a plurality of types of distributed power supplies having different tracking performance with respect to load fluctuation.

電力市場自由化後の社会動向として、以下の（１）〜（４）に示す理由からさまざまな分散型電源（天然ガスコージェネレーションや燃料電池）がエネルギー供給設備として建物内に進出してくる可能性が高くなっている。
（１）熱電併給により、相当高い総合エネルギー効率（８０％強）を期待できる。
（２）ＣＯ_２排出量削減が期待できる。
（３）商用系統からの契約電力量の削減や配電施設の低減によるコスト削減が期待できる。
（４）震災、火災時の自立安定性が高い。 As social trends after the liberalization of the electric power market, various distributed power sources (natural gas cogeneration and fuel cells) may enter the building as energy supply facilities for the reasons shown in (1) to (4) below. Is high.
(1) A considerably high total energy efficiency (over 80%) can be expected by cogeneration.
(2) Reduction of CO ₂ emissions can be expected.
(3) It can be expected to reduce costs by reducing the amount of contracted power from the commercial grid and by reducing distribution facilities.
(4) High independence during earthquakes and fires.

現在これらの分散型電源は、主に需要家のエネルギーコスト削減を目的として導入されており、稼働率が高くなり経済性を発揮しやすい「ベースロード運転」（図５（ａ）参照）によって定格運転されている。今後、より多くの分散型電源が需要家サイドに入り、ベースロード運転にて商用系統に接続されると、商用系統は負荷変動の補償ばかりを求められ、電圧や周波数変動の調整機能（これをアンシラリー機能という）を一手に引き受けることになる。端的に言えば、電力会社が損な役割を担うことになる。 Currently, these distributed power sources are introduced mainly for the purpose of reducing energy costs for customers, and are rated by “base load operation” (see Fig. 5 (a)), which is easy to achieve high operating rate and economy. It is driving. In the future, when more distributed power sources enter the consumer side and are connected to the commercial grid by base load operation, the commercial grid will only be required to compensate for load fluctuations and adjust voltage and frequency fluctuation adjustment functions (this (This is called an ancillary function). In short, the power company will play a detrimental role.

一方、国の施策として、分散型電源の負荷追従運転によって商用系統への負担を軽減して協調関係の構築を目指す動きがある。近年、議論が始まった「マイクログリッド」である。マイクログリッドの思想を取り込んだ分散型電源によるエネルギー供給システムでは、商用系統連系時には買電一定運転（図５（ｂ）参照）が、また自立運転時には自立範囲内に安定した品質の電力を供給することが求められている。 On the other hand, as a national measure, there is a movement aiming to build a cooperative relationship by reducing the burden on the commercial system by load following operation of distributed power sources. The “microgrid” has recently been discussed. In an energy supply system using a distributed power supply that incorporates the idea of microgrids, constant power purchase operation (see Fig. 5 (b)) is connected during commercial grid connection, and stable quality power is supplied within the independent range during autonomous operation. It is requested to do.

系統連系時の買電一定運転ならびに自立運転時の安定した品質での電力供給は、マイクログリッド内の負荷変動と分散型電源による出力の需給バランスを常に一致すること（負荷追従運転）によって実現される。特に自立運転時においては需給バランスがずれてしまうと周波数や電圧といった電力品質が著しく悪化してしまい、最悪の場合には分散型電源が停止して自立運転が維持できなくなる。 Constant power purchase during grid interconnection and stable power supply during independent operation are realized by always matching the load fluctuation in the microgrid and the output supply / demand balance by the distributed power supply (load following operation). Is done. In particular, if the supply and demand balance is shifted during the independent operation, the power quality such as frequency and voltage is remarkably deteriorated. In the worst case, the distributed power supply is stopped and the independent operation cannot be maintained.

負荷追従運転を実現するための方法は２つに大別することができる。１つ目は特許文献１に記載の系統安定化装置のように、各分散型電源が自律的に負荷電力を計測して負荷追従運転を行う方法（分散制御）であり、この方法を用いると高速な負荷変動に対する追従運転が実現できる。しかし、複数の分散型電源が導入されるケースにおいては、各分散型電源が同時に同じ負荷変動に対して負荷追従運転を行ってしまうことで出力の干渉が発生してしまい、結果として負荷追従運転が失敗する恐れがある。 Methods for realizing the load following operation can be roughly divided into two methods. The first is a method (distributed control) in which each distributed power source autonomously measures load power and performs load following operation like the system stabilization device described in Patent Document 1, and this method is used. Follow-up operation for high-speed load fluctuation can be realized. However, in cases where multiple distributed power sources are introduced, each distributed power source simultaneously performs load following operation for the same load fluctuation, resulting in output interference, resulting in load following operation. There is a risk of failure.

２つ目の方法としては特許文献２に記載の分散型電源の制御方法（統合制御）がある。これは計測した負荷電力を基に、追従性能の異なる複数種類の分散型電源（図６参照）を組み合わせて当該周波数帯域を分担させることで負荷追従運転を実現するとしている。そのため統合的な出力調整を行うために、「負荷、買電、分散型電源出力の計測系」と「分散型電源出力の制御系」を持つ制御システム（制御の頭脳部）を構築する必要がある。 As a second method, there is a distributed power control method (integrated control) described in Patent Document 2. Based on the measured load power, load follow-up operation is realized by combining a plurality of types of distributed power sources (see FIG. 6) having different follow-up performance and sharing the frequency band. Therefore, in order to perform integrated output adjustment, it is necessary to construct a control system (the brain of control) that has a "load, power purchase, distributed power output measurement system" and a "distributed power output control system". is there.

一方、特許文献３に記載されているように分散型電源が商用系統に繋がっている（系統連系）エネルギー供給システムが知られている。図４は、特許文献３に記載されているエネルギー供給システムの構成を示すブロック図である。図４に示すように、負荷５に対して商用系統７が繋がっており、商用系統７が供給している電力を計測する電力計測器１７が備えられている。また、分散型電源は、ガスエンジン１、二次電池２、電気二重層キャパシタ等の電力貯蔵装置３及び電力出力を制御する制御コンピュータ４から構成する。ガスエンジン１には、有効電力（Ｐ_ＧＥ）を計測して、制御コンピュータ４に対して出力する電力計測器１１を備えている。二次電池２には、有効電力（Ｐ_ＢＥＳ）を計測して、制御コンピュータ４に対して出力する電力計測器１２を備えている。電力貯蔵装置３には、有効電力（Ｐ_ＥＤＬＣ）を計測して、制御コンピュータ４に対して出力する電力計測器１３を備えている。 On the other hand, as described in Patent Document 3, an energy supply system in which a distributed power source is connected to a commercial system (system interconnection) is known. FIG. 4 is a block diagram showing the configuration of the energy supply system described in Patent Document 3. As shown in FIG. As shown in FIG. 4, a commercial system 7 is connected to the load 5, and a power measuring instrument 17 that measures the power supplied by the commercial system 7 is provided. The distributed power source includes a gas engine 1, a secondary battery 2, a power storage device 3 such as an electric double layer capacitor, and a control computer 4 that controls power output. The gas engine 1 includes a power meter 11 that measures active power (P _GE ) and outputs the measured power to the control computer 4. The secondary battery 2 includes a power measuring instrument 12 that measures active power (P _BES ) and outputs it to the control computer 4. The power storage device 3 includes a power _meter 13 that measures active power (P _EDLC ) and outputs it to the control computer 4.

電力の需給においては瞬時々々における需要と供給が一致するという前提がある。すなわち図４に示すシステムにおいては、ＰＬ＝Ｐ_ＧＥ＋Ｐ_ＢＥＳ＋Ｐ_ＥＤＬＣ＋Ｐ_ＧＲＩＤが必ず成立する。このＰＬから各分散型電源の出力を決定することにより買電電力を一定とすることができる。すなわち、負荷推定値ＰＬから買電目標値Ｐ_ＧＲＩＤを減算した差分によってガスエンジン１の出力指令値を決定し、これにより負荷変動の主成分を補償する。また、負荷推定値ＰＬから買電目標値Ｐ_ＧＲＩＤとガスエンジン１の出力値Ｐ_ＧＥを減算することにより、二次電池２の補償するべきＰ_ＢＥＳが得られ、ガスエンジン１で補償できなかった高速な負荷変動を補償する。さらに、負荷推定値ＰＬから買電目標値Ｐ_ＧＲＩＤとガスエンジン１の出力値Ｐ_ＧＥ並びに二次電池２の出力値Ｐ_ＢＥＳを減算することで、電力貯蔵装置３が補償すべき成分が得られ、さらに高速な負荷変動を補償することができる。ガスエンジン１、二次電池２及び電力貯蔵装置３によって負荷追従が実現できた場合、商用系統７からの買電電力はＰ_ＧＲＩＤで一定となる。
特開２００７−０２０３６１号公報特開２００６−２４６５８４号公報特開２００８−２２８４２２号公報 In the supply and demand of electric power, there is a premise that the demand and supply in an instant will coincide. That is, in the system shown in FIG. 4, PL = P _GE + P _BES + P _EDLC + P _GRID is always established. The purchased power can be made constant by determining the output of each distributed power source from this PL. That is, the output command value of the gas engine 1 is determined by the difference obtained by subtracting the power purchase target value _PGRID from the load estimated value PL, thereby compensating for the main component of load fluctuation. Further, by subtracting the power purchase target value P _GRID and the output value P _GE of the gas engine 1 from the estimated load value PL, P _BES to be compensated for the secondary battery 2 was obtained, and the gas engine 1 could not compensate. Compensates for fast load fluctuations. Further, by subtracting the power purchase target value P _GRID , the output value P _GE of the gas engine 1 and the output value P _BES of the secondary battery 2 from the estimated load value PL, a component to be compensated for by the power storage device 3 is obtained. Further, it is possible to compensate for faster load fluctuations. When load following can be realized by the gas engine 1, the secondary battery 2, and the power storage device 3, the purchased power from the commercial system 7 is constant at _PGRID .
JP 2007-020361 A JP 2006-246484 A JP 2008-228422 A

しかしながら、図４に示すように二次電池２や電力貯蔵装置３が商用系統７から見て末端部に設置されている系統構成では、超急速な負荷変動に追従可能である（最も応答性に優れた）電力貯蔵装置３の出力指令値を決定する為に必要となる「Ｐ_ＬＯＡＤ−Ｐ_ＧＥ−Ｐ_ＢＥＳ」の値を直接測定することが不可能であるため、複数の測定値を利用して「Ｐ_ＬＯＡＤ−Ｐ_ＧＥ−Ｐ_ＢＥＳ」の値を推定する必要がある。電力貯蔵装置３の出力指令値を決定する為に必要となる「Ｐ_ＬＯＡＤ−Ｐ_ＧＥ−Ｐ_ＢＥＳ」とは、商用系統７からの一定買電以外に、分散型電源が出力しなければならない電力のうち、最も応答性に優れた電力貯蔵装置３が分担出力すべき電力指令値である。この「Ｐ_ＬＯＡＤ−Ｐ_ＧＥ−Ｐ_ＢＥＳ」の値を推定する際、測定値取得の時間同期をとる必要があるが、厳密に同期をとることは現実的には不可能なため、推定した「Ｐ_ＬＯＡＤ−Ｐ_ＧＥ−Ｐ_ＢＥＳ」の値には誤差を含んでしまうという問題がある。また、電力貯蔵装置３と連系点が離れているため、連系点電力を一定にするために出力した電力を一部損失してしまい、高精度な補償が行うことができないという問題もある。 However, in the system configuration in which the secondary battery 2 and the power storage device 3 are installed at the end as viewed from the commercial system 7 as shown in FIG. Since it is impossible to directly measure the value of “P _LOAD -P _GE -P _BES ”, which is necessary for determining the output command value of the power storage device 3 (excellent), a plurality of measured values are used. Therefore, it is necessary to estimate the value of “P _LOAD −P _GE −P _BES ”. “P _LOAD -P _GE -P _BES ” required to determine the output command value of the power storage device 3 is the power that the distributed power supply must output in addition to the constant power purchase from the commercial system 7. Among these, the power command value that should be shared and output by the power storage device 3 having the most responsiveness. When estimating the value of “P _LOAD -P _GE -P _BES ”, it is necessary to synchronize the time of measurement value acquisition. However, since it is practically impossible to strictly synchronize, the estimated “ There is a problem that the value of “P _LOAD −P _GE −P _BES ” includes an error. In addition, since the power storage device 3 and the connection point are separated, there is a problem in that a part of the output power is lost to make the connection point power constant, and high-precision compensation cannot be performed. .

本発明は、このような事情に鑑みてなされたもので、各分散型電源の運転制御を実施する際に高精度な負荷追従運転を実現することができる分散型電源システムを提供することを目的とする。 The present invention has been made in view of such circumstances, and an object of the present invention is to provide a distributed power supply system capable of realizing highly accurate load following operation when performing operation control of each distributed power supply. And

本発明は、負荷変動に対する追従性能が異なる複数の分散型電源を統合的に制御して商用系統への負担を軽減するために、負荷追従性能の最も高い分散型電源を除く分散型電源が前記商用系統と接続される第１接続点よりも前記商用系統に近い第２接続点に負荷追従性能の最も高い分散型電源が接続される分散型電源システムであって、前記第１接続点より上流において前記第２接続点の二次側位置の電力を計測することで、負荷の計測電力値から負荷追従性能の最も高い分散型電源を除く分散型電源の各計測電力値を減算した値を計測する電力計測手段と、前記電力計測手段による計測電力値に基づいて出力指令値を決定し、決定した出力指令値により前記負荷追従性能の最も高い分散型電源の出力電力を制御する制御手段とを備えたことを特徴とする。
In order to reduce the burden on the commercial system by comprehensively controlling a plurality of distributed power sources having different tracking performance with respect to load fluctuations, the distributed power sources except the distributed power source having the highest load following performance are A distributed power supply system in which a distributed power supply having the highest load following performance is connected to a second connection point that is closer to the commercial system than a first connection point that is connected to the commercial system, and is upstream of the first connection point Measures the value obtained by subtracting each measured power value of the distributed power supply excluding the distributed power supply with the highest load following performance from the measured power value of the load by measuring the power at the secondary side position of the second connection point in Power measuring means for determining the output command value based on the measured power value by the power measuring means, and a control means for controlling the output power of the distributed power source having the highest load following performance based on the determined output command value. Prepared And features.

本発明によれば、分散型電源システムにおいて、各分散型電源の運転制御を実施する際に高精度な負荷追従運転を実現することができるため、結果として商用系統連系時の買電一定制御を高精度で実現することができるという効果が得られる。 According to the present invention, in the distributed power supply system, it is possible to realize highly accurate load following operation when performing the operation control of each distributed power supply, and as a result, constant power purchase control during commercial grid connection Can be realized with high accuracy.

＜第１の実施形態＞
以下、本発明の一実施形態による分散型電源システムを図面を参照して説明する。図１は同実施形態の構成を示すブロック図である。この図において、図４に示す従来の装置と同一の部分には同一の符号を付し、その説明を省略する。この図に示す装置が従来の装置と異なる点は、負荷５と商用系統７との間に、複数の分散型電源のうち負荷追従性能の最も高い分散型電源（ここでは電力貯蔵装置３が該当する）を除く分散型電源（ガスエンジン１及び二次電池２）が接続点Ｐ１において接続され、接続点Ｐ１と商用系統７との間に負荷追従性能の最も高い分散型電源（電力貯蔵装置３）が接続点Ｐ２において接続されている点である。また、電力貯蔵装置３の接続位置の変更に伴い、接続点Ｐ１と、接続点Ｐ２との間の電力を電力計測器１３によって計測し、アナログの信号線Ｓ１により計測値を制御コンピュータ４へ出力するようにしている。なお図１に示す矢印Ａ１、Ａ２、Ａ３の方向を、各点における計測値の正方向とする。 <First Embodiment>
Hereinafter, a distributed power supply system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In this figure, the same parts as those of the conventional apparatus shown in FIG. The device shown in this figure is different from the conventional device in that the distributed power source having the highest load following performance among the plurality of distributed power sources (in this case, the power storage device 3 is applicable) between the load 5 and the commercial system 7. Distributed power sources (gas engine 1 and secondary battery 2) are connected at connection point P1, and the distributed power source (power storage device 3) having the highest load following performance is connected between connection point P1 and commercial system 7. ) Is a point connected at the connection point P2. Further, along with the change of the connection position of the power storage device 3, the power between the connection point P1 and the connection point P2 is measured by the power meter 13, and the measured value is output to the control computer 4 by the analog signal line S1. Like to do. Note that the directions of arrows A1, A2, and A3 shown in FIG. 1 are the positive directions of the measured values at each point.

このような接続形態にして、電力貯蔵装置３を商用系統７の連系点近傍に接続し、その二次側位置（下流側）にて電力計測器１３により電力計測を行えば、負荷追従性能の最も高い分散型電源である電力貯蔵装置３の出力指令値となる「Ｐ_ＬＯＡＤ−Ｐ_ＧＥ−Ｐ_ＢＥＳ」を直接計測することが可能となる。この計測値を、制御コンピュータ４に対して出力した上で、特に出力決定のための演算を行なうことなく制御コンピュータ４から最終的な出力指令値Ｐs_ＥＤＬＣを電力貯蔵装置３に対して出力することが可能となる。 If the power storage device 3 is connected in the vicinity of the connection point of the commercial system 7 in such a connection form, and the power measurement is performed by the power meter 13 at the secondary side position (downstream side), the load follow-up performance It is possible to directly measure “P _LOAD −P _GE −P _BES ” that is the output command value of the power storage device 3 that is the highest distributed power source. The measured value is output to the control computer 4, and the final output command value Ps _EDLC is output from the control computer 4 to the power storage device 3 without particularly performing an operation for determining the output. Is possible.

＜第２の実施形態＞
次に、図２を参照して、図１に示す分散型電源システムの変形例を説明する。この図において、図１に示す装置と同一の部分には同一の符号を付し、その説明を省略する。この図に示す装置が図１に示す装置と異なる点は、接続点Ｐ１と、接続点Ｐ２との間の電力を電力計測器１３によって計測し、この計測値をアナログの信号線Ｓ２により直接電力貯蔵装置３に対して出力し、電力貯蔵装置３のみを分散して制御を行うようにした点である。 <Second Embodiment>
Next, a modified example of the distributed power supply system shown in FIG. 1 will be described with reference to FIG. In this figure, the same parts as those in the apparatus shown in FIG. The difference between the apparatus shown in FIG. 1 and the apparatus shown in FIG. 1 is that the power between the connection point P1 and the connection point P2 is measured by the power measuring instrument 13, and the measured value is directly converted into power by the analog signal line S2. The output is to the storage device 3 and only the power storage device 3 is distributed and controlled.

このような接続形態にして、電力貯蔵装置３を商用系統７の連系点近傍に接続し、その二次側位置（下流側）にて電力計測器１３により電力計測を行えば、負荷追従性能の最も高い分散型電源である電力貯蔵装置３の出力指令値となる「Ｐ_ＬＯＡＤ−Ｐ_ＧＥ−Ｐ_ＢＥＳ」を直接計測することが可能となる。この計測値に基づいて電力貯蔵装置３の出力指令値を求めて、この出力指令値に基づいて電力貯蔵装置３の出力を制御することが可能となる。 If the power storage device 3 is connected in the vicinity of the connection point of the commercial system 7 in such a connection form, and the power measurement is performed by the power meter 13 at the secondary side position (downstream side), the load follow-up performance It is possible to directly measure “P _LOAD −P _GE −P _BES ” that is the output command value of the power storage device 3 that is the highest distributed power source. Based on this measured value, the output command value of the power storage device 3 can be obtained, and the output of the power storage device 3 can be controlled based on this output command value.

＜第３の実施形態＞
次に、図３を参照して、図２に示す分散型電源システムの変形例を説明する。この図において、図２に示す装置と同一の部分には同一の符号を付し、その説明を省略する。この図に示す装置が図２に示す装置と異なる点は、制御コンピュータ４と電力計測器１７を省き、ガスエンジン１及び二次電池２のそれぞれについても分散して制御を行うようにした点である。このために、電力計測器１１の出力を周波数フィルタ１８によって特定の周波数成分のみを抽出して、この特定の周波数成分の計測値に基づいてガスエンジン１の出力指令値を求めて、この出力指令値に基づいてガスエンジン１の出力を制御する。また、電力計測器１２の出力を周波数フィルタ１９によって特定の周波数成分のみを抽出して、この特定の周波数成分の計測値に基づいて二次電池２の出力指令値を求めて、この出力指令値に基づいて二次電池２の出力を制御する。 <Third Embodiment>
Next, a modification of the distributed power supply system shown in FIG. 2 will be described with reference to FIG. In this figure, the same parts as those of the apparatus shown in FIG. The apparatus shown in this figure is different from the apparatus shown in FIG. 2 in that the control computer 4 and the power meter 17 are omitted, and the gas engine 1 and the secondary battery 2 are also distributed and controlled. is there. For this purpose, only a specific frequency component is extracted from the output of the power meter 11 by the frequency filter 18, an output command value of the gas engine 1 is obtained based on the measured value of the specific frequency component, and this output command The output of the gas engine 1 is controlled based on the value. Further, only a specific frequency component is extracted from the output of the power meter 12 by the frequency filter 19, and an output command value of the secondary battery 2 is obtained based on the measured value of the specific frequency component. Is used to control the output of the secondary battery 2.

このような接続形態にして、電力貯蔵装置３を商用系統７の連系点近傍に接続し、その二次側位置（下流側）にて電力計測器１３により電力計測を行えば、負荷追従性能の最も高い分散型電源である電力貯蔵装置３の出力指令値となる「Ｐ_ＬＯＡＤ−Ｐ_ＧＥ−Ｐ_ＢＥＳ」を直接計測することが可能となる。この計測値に基づいて電力貯蔵装置３の出力指令値を求めて、この出力指令値に基づいて電力貯蔵装置３の出力を制御することが可能となる。また、電力貯蔵装置３を商用系統７の連系点近傍に接続したため、各分散型電源を分散制御としても問題なく出力の制御を行うことが可能となる。 If the power storage device 3 is connected in the vicinity of the connection point of the commercial system 7 in such a connection form, and the power measurement is performed by the power meter 13 at the secondary side position (downstream side), the load follow-up performance It is possible to directly measure “P _LOAD −P _GE −P _BES ” that is the output command value of the power storage device 3 that is the highest distributed power source. Based on this measured value, the output command value of the power storage device 3 can be obtained, and the output of the power storage device 3 can be controlled based on this output command value. Further, since the power storage device 3 is connected in the vicinity of the interconnection point of the commercial system 7, it is possible to control the output without any problem even if each distributed power source is used as distributed control.

なお、前述した説明においては、商用系統７の連系点近傍に接続する分散型電源を電力貯蔵装置３として説明したが、商用系統７の連系点近傍に接続する分散型電源は、分散型電源システムを構成する電源のうち、負荷追従性能の最も高い分散型電源を用いるようにすればよい。例えば、図１〜３に示す分散型電源システムは、図６に示す第１類〜第４類の全ての電源を備えている構成であるため、第４類の電力貯蔵装置３を商用系統７の連系点近傍に接続するようにしたが、第１類〜第３類の電源が備えられている場合は、第３類の二次電池等の電源を商用系統７の連系点近傍に接続するようにすればよい。 In the above description, the distributed power source connected near the interconnection point of the commercial system 7 has been described as the power storage device 3, but the distributed power source connected near the interconnection point of the commercial system 7 is distributed type. Of the power sources constituting the power system, a distributed power source having the highest load following performance may be used. For example, the distributed power supply system shown in FIGS. 1 to 3 is configured to include all of the first to fourth power sources shown in FIG. However, if a power source of type 1 to type 3 is provided, a power source such as a secondary battery of type 3 is connected to the vicinity of the connection point of the commercial system 7. What is necessary is just to make it connect.

以上説明したように、電力貯蔵装置３（負荷追従性能の最も高い分散型電源）を商用系統７との連系点近傍に接続するようにしたため、電力貯蔵装置３の出力指令値を決定する為に必要な「Ｐ_ＬＯＡＤ−Ｐ_ＧＥ−Ｐ_ＢＥＳ」を一箇所で直接計測でき、電力貯蔵装置３からの出力によって高精度に系統連系時の買電一定制御を実現することが可能となる。また、電力貯蔵装置３の出力指令値を決定する為に必要な「Ｐ_ＬＯＡＤ−Ｐ_ＧＥ−Ｐ_ＢＥＳ」を一箇所で直接計測できるため、測定の時間同期をとるための装置が不要となり、システム構成を簡単にすることができる。また、商用系統７の連系点直近に電力貯蔵装置３を設置することにより、電力貯蔵装置３の出力損失がほぼゼロになるため、高精度に系統連系時の買電一定制御が可能となる。 As described above, since the power storage device 3 (distributed power source having the highest load following performance) is connected in the vicinity of the connection point with the commercial system 7, the output command value of the power storage device 3 is determined. It is possible to directly measure “P _LOAD -P _GE -P _BES ” required for the power supply, and it is possible to realize constant power purchase control at the time of grid interconnection with high accuracy by the output from the power storage device 3. In addition, since “P _LOAD -P _GE -P _BES ” necessary for determining the output command value of the power storage device 3 can be directly measured at one place, an apparatus for taking time synchronization of the measurement becomes unnecessary, and the system The configuration can be simplified. Moreover, since the output loss of the power storage device 3 becomes almost zero by installing the power storage device 3 in the immediate vicinity of the connection point of the commercial system 7, it is possible to control power purchase constant at the time of system connection with high accuracy. Become.

本発明の第１の実施形態の構成を示すブロック図である。It is a block diagram which shows the structure of the 1st Embodiment of this invention. 本発明の第２の実施形態の構成を示すブロック図である。It is a block diagram which shows the structure of the 2nd Embodiment of this invention. 本発明の第３の実施形態の構成を示すブロック図である。It is a block diagram which shows the structure of the 3rd Embodiment of this invention. 従来技術のシステム構成を示すブロック図である。It is a block diagram which shows the system configuration of a prior art. ベースロード運転と買電一定運転の状態を示す説明図である。It is explanatory drawing which shows the state of a base load driving | operation and a power purchase fixed driving | operation. 分散型電源の特徴を示す説明図である。It is explanatory drawing which shows the characteristic of a distributed power supply.

Explanation of symbols

１・・・ガスエンジン、２・・・二次電池、３・・・電力貯蔵装置、４・・・制御コン
ピュータ、５・・・負荷、６・・・計測できない負荷、７・・・商用系統、１１、１２、
１３、１５、１７・・・電力計測器、１８、１９・・・周波数フィルタ DESCRIPTION OF SYMBOLS 1 ... Gas engine, 2 ... Secondary battery, 3 ... Electric power storage apparatus, 4 ... Control computer, 5 ... Load, 6 ... Load which cannot be measured, 7 ... Commercial system , 11, 12,
13, 15, 17 ... power meter, 18, 19 ... frequency filter

Claims

In order to reduce the burden on the commercial system through integrated control of multiple distributed power supplies with different follow-up performance against load fluctuations, distributed power sources other than the distributed power source with the highest load-following performance are connected to the commercial system. A distributed power supply system in which a distributed power supply having the highest load following performance is connected to a second connection point closer to the commercial system than the first connection point,
By measuring the power at the secondary side position of the second connection point upstream from the first connection point , each measured power of the distributed power source excluding the distributed power source having the highest load following performance from the measured power value of the load A power measuring means for directly measuring a value obtained by subtracting the value ;
Control means for determining an output command value based on a measured power value by the power measuring means, and controlling output power of the distributed power source having the highest load following performance based on the determined output command value. Features a distributed power supply system.