WO2007099767A1 - New energy generation system output fluctuation mitigating device - Google Patents

New energy generation system output fluctuation mitigating device Download PDF

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Publication number
WO2007099767A1
WO2007099767A1 PCT/JP2007/052599 JP2007052599W WO2007099767A1 WO 2007099767 A1 WO2007099767 A1 WO 2007099767A1 JP 2007052599 W JP2007052599 W JP 2007052599W WO 2007099767 A1 WO2007099767 A1 WO 2007099767A1
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Prior art keywords
power
power generation
unit
value
change rate
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PCT/JP2007/052599
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French (fr)
Japanese (ja)
Inventor
Keiji Takahara
Satoru Nakamura
Yusuke Kuniba
Hiromichi Matsuda
Masaru Miyagi
Naoto Higa
Katsuhiro Shinzen
Yasuo Kataoka
Masakatsu Nomura
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Meidensha Corporation
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Priority to CN200780006394XA priority Critical patent/CN101438476B/en
Publication of WO2007099767A1 publication Critical patent/WO2007099767A1/en

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

[PROBLEMS] Electric power generated by a generator for generating electric power by converting natural energy into electric energy is greatly affected by a meteorological condition and the generator of a generation facility cannot follow the power fluctuation of generated power. [MEANS FOR SOLVING PROBLEMS] Electric power generated by a generator is detected and inputted into a change ratio calculation unit. The change ratio calculation unit is supplied with a positive direction change ratio setting value and a negative direction change ratio setting value which are set to limit values as change amounts smaller than the largest power change amount which can be followed by a governor of the generator of the generation facility. The change ratio calculation unit calculates a charge/discharge instruction value according to each imputed signal.

Description

明 細 書  Specification
新エネルギー発電システム出力変動緩和装置  New energy generation system output fluctuation mitigation device
技術分野  Technical field
[0001] 本発明は、 自然エネルギーを利用した発電システムに係り、特に発電電力の変動 を緩和するための新エネルギー発電システム出力変動緩和装置に関するものである 背景技術  [0001] The present invention relates to a power generation system using natural energy, and more particularly to a new energy power generation system output fluctuation alleviating device for reducing fluctuation of generated power.
[0002] 風力や太陽光などの自然エネルギーを利用した発電システムは、それ自体では発 電電力が気象条件に大きく影響されるために種々の手法により電力変動の緩和が図 られ、例えば、太陽光発電システムとしては特許文献 1が公知となっている。  [0002] A power generation system using natural energy such as wind power or solar light can reduce power fluctuation by various methods because the generated power is greatly affected by weather conditions by itself. Patent Document 1 is known as a power generation system.
[0003] 特許文献 1のものは、複数設置された太陽電池の出力を集電し、系統連系型イン バータを介して電力系統に接続すると共に、太陽電池とインバータ間に蓄電装置を 有する充放電回路を接続し、太陽電池の出力が充放電回路を介して蓄電装置に充 電、或いは放電するように構成したものである。そして、この充放電時の制御は、太陽 電池の発電電力を検出し、その電力の移動平均値を算出して充放電制御を実施し て日射の変動による太陽電池の発電電力変動を吸収して電力系統への逆潮流電力 の変動を抑制している。  [0003] In the case of Patent Document 1, the output of a plurality of installed solar cells is collected and connected to a power system via a grid-connected inverter, and a charging device having a storage device between the solar cell and the inverter is provided. A discharge circuit is connected, and the output of the solar cell is configured to charge or discharge the power storage device through the charge / discharge circuit. And this control at the time of charge and discharge detects the generated electric power of the solar cell, calculates the moving average value of the electric power, implements charge and discharge control, and absorbs the generated electric power fluctuation of the solar cell due to the fluctuation of solar radiation. It controls the fluctuation of reverse flow power to the power system.
[0004] 特許文献 2には、離島等において商用電源としてディーゼノレ発電機を設置し、出力 変動の大きい風力発電システムを分散電源として接続したシステム構成のものが開 示されている。この文献 2には、有効電力及び無効電力変動による周波数変動をィ ンバータ及び電力貯蔵装置により抑制するに当たって、風力発電システムの有効電 力変動を検出し、ディーゼル発電機のガバナ特性のカットオフ周波数から割り出され たカットオフ周波数を有する高域フィルタにより有効電力変動から短周期変動分を抽 出し、インバータの有効電力指令値を作成することが記載されてレ、る。  Patent Document 2 discloses a system configuration in which a diesel generator is installed as a commercial power source on a remote island or the like, and a wind power generation system with large output fluctuation is connected as a distributed power source. In this reference 2, when suppressing the frequency fluctuation due to the active power and reactive power fluctuation by the inverter and the power storage device, the effective power fluctuation of the wind power generation system is detected, and the cutoff frequency of the governor characteristic of the diesel generator is It is described that the short cycle fluctuation is extracted from the active power fluctuation by the high-pass filter having the cut-off frequency determined, and the active power command value of the inverter is created.
[0005] 特許文献 1 :日本国の公開特許である特開 2001— 5543号公報  Patent Document 1: Japanese Patent Application Laid-Open No. 2001-5543, which is a published patent of Japan
特許文献 2 :日本国の公開特許である特開 2000— 4541号公報  Patent Document 2: Japanese Patent Application Laid-Open No. 2000-4541, which is a published patent of Japan
発明の開示 [0006] 上述のように、電力系統に自然エネルギーを利用した発電システムを電源として連 系する場合、電力貝宁蔵装置やインバータを用いて逆潮流電力の変動を抑制している 、その制御において、特許文献 1では電力の移動平均値を算出し、この算出値に 基づいた信号により充放電制御を実行しているため、以下の問題を有している。 すなわち、移動平均は、入力信号系列を x(nT)とすると、この入力信号系列 χ(ηΤ)から 順に Ν点 (Νは移動平均回数)を取り出し、それらを加算し、その結果を Νで割ることに よって入力信号系歹 IJx(nT)の移動平均である出力系歹 IJy(nT)を得ている。このため、移 動平均回数を大きくすると加算量が大きくなり、過去の入力を記憶するための領域も 大きくなつて制御演算装置の処理能力を超えてしまうか、若しくは高価な処理能力の 高い制御演算装置が必要となる。 Disclosure of the invention As described above, when a power generation system using natural energy is linked to a power system as a power source, fluctuations in reverse flow power are suppressed using a power storage device or an inverter. In Patent Document 1, a moving average value of electric power is calculated, and charge / discharge control is performed by a signal based on the calculated value. Therefore, the following problems occur. That is, assuming that the input signal sequence is x (nT), the moving average takes out Ν points (Ν is the number of moving averages) in order from this input signal sequence χ (ΤΤ), adds them, and divides the result by Ν Thus, an output system 歹 IJy (nT) which is a moving average of the input signal system 歹 IJx (nT) is obtained. Therefore, if the moving average number is increased, the amount of addition increases, and the area for storing past inputs also increases to exceed the processing capability of the control arithmetic device or an expensive control computation with high processing capability. Equipment is required.
[0007] また、このような移動平均を用いた場合、通常、スタートアップ時にリングバッファの すべてのフィールド (フィールド数は上記した Nに対応)を初回検出値で埋める方式が よく採用され、この初回検出値が不安定な入力データなどから得られた異常な検出 値であると、リングバッファのすべてのフィールド分の検出が終了するまで異常な検 出値の景響が残ってしまうという問題がある。  [0007] When such a moving average is used, usually, a method is often employed in which all fields (the number of fields correspond to N described above) of the ring buffer are filled with an initial detection value at startup. If the value is an abnormal detection value obtained from an unstable input data etc., there is a problem that the reflection of the abnormal detection value remains until detection of all fields in the ring buffer is completed.
[0008] さらに、特許文献 2のように、有効電力の変動量を検出して高域フィルタを介してィ ンバータの指令値を生成する場合、変動量の大きさによって変動抑制後の系統に与 える変動量の傾きが変わってくる。一般に、系統に接続された発電機が変動に追従 できる出力の変化率には限界があり、そのため系統に与える変動を発電機が追従で きる限界内に収めるような移動平均数カットオフ周波数を設定する必要がある。しか し、自然エネルギーを用いた発電装置の出力変化量は大きぐ高域フィルタによる出 力の変動抑制を行った場合でも変動量の大きさによって出力変動の急変に追従でき ず、系統側の発電機の追従範囲を超えた変化率が出力されることがある。同様に、 移動平均による出力変動抑制の場合も、発電機の追従範囲を超えた変化率が出力 されることがある。  Furthermore, as in Patent Document 2, when detecting the fluctuation amount of active power and generating an inverter command value through a high-pass filter, the system after fluctuation suppression is given according to the fluctuation amount. The inclination of the amount of fluctuation changes. In general, there is a limit to the rate of change of output that generators connected to the grid can follow fluctuations, so a moving average number cut-off frequency is set to keep the fluctuations given to the grid within the limits that the generator can follow. There is a need to. However, even if output fluctuation is suppressed by the high-pass filter, the output fluctuation of the power generator using natural energy can not follow the sudden fluctuation of the output fluctuation due to the magnitude of fluctuation, even if power fluctuation is suppressed. The rate of change beyond the range of the aircraft may be output. Similarly, in the case of output fluctuation suppression by moving average, a change rate beyond the generator's tracking range may be output.
[0009] したがって本発明が目的とするところは、異常な検出値の影響が残らないことおよ び発電部の出力変動の急変時においても発電設備の発電機用ガバナまたは Zおよ び電力系統が追従可能な電力変動となるような自然エネルギーを利用した発電シス テムに用いる新エネルギー発電システム出力変動緩和装置を提供することにある。 [0009] Therefore, the object of the present invention is to ensure that the influence of abnormal detected values does not remain and that the governor or generator for the generator of the power generation facility or the power system is Generation system using natural energy that makes it possible to follow power fluctuations It is an object of the present invention to provide a new energy power generation system output fluctuation mitigating device used for the system.
[0010] 本発明の 1つの観点によれば、電力系統から独立した発電設備に自然エネルギー を電気エネルギーに変換して電力を発電する発電部を連系し、この発電設備と発電 部との間に電力貯蔵部を有する充放電部を接続し、電力貯蔵部に蓄えたエネルギ ーを充放電部で充電または放電制御することにより前記発電部の出力と充放電部の 出力とを加減算して電力の変動を緩和するものにおいて、  [0010] According to one aspect of the present invention, a power generation unit independent of the electric power system is interconnected with a power generation unit that converts natural energy into electric energy and generates power, and the power generation unit is connected to the power generation unit. The charge / discharge unit having the power storage unit is connected to the power storage unit, and the energy stored in the power storage unit is charged or discharged by the charge / discharge unit to add / subtract the output of the power generation unit and the output of the charge / discharge unit. In mitigating
前記発電部の発電電力を検出して変化率演算部に入力し、且つこの変化率演算部 に前記発電設備のガバナの最大追従可能な電力変化量よりも小さい変化量となるよ うな制限値に設定された前記発電電力の正方向変化率設定値、及び負方向変化率 設定値とを導入し、この変化率演算部の出力と発電部の発電電力検出値との差分を 前記充放電部の充放電指令値とすることを特徴としたものである。  The power generated by the power generation unit is detected and input to the change rate calculation unit, and the change rate calculation unit is set to a limit value smaller than the maximum change in power of the governor of the power generation facility. The set value of the change rate in the positive direction and the set value of the change rate in the negative direction of the generated power are introduced, and the difference between the output of the change rate calculation unit and the detected value of the generated power of the power generation unit The charge / discharge command value is characterized.
[0011] 本発明の他の観点によれば、電力系統に自然エネルギーを電気エネルギーに変 換して電力を発電する発電部を連系し、この電力系統と発電部との間に電力貯蔵部 を有する充放電部を接続し、電力貯蔵部に蓄えたエネルギーを充放電部で充電ま たは放電制御することにより前記発電部の出力と充放電部の出力とを加減算して電 力の変動を緩和するものにおいて、  [0011] According to another aspect of the present invention, a power generation unit is connected to the power system, which converts natural energy into electric energy to generate electric power, and the power storage unit is interposed between the power system and the power generation unit. The charge / discharge unit is connected, and the energy stored in the power storage unit is charged or discharged by the charge / discharge unit, thereby adding / subtracting the output of the power generation unit and the output of the charge / discharge unit to change the power In what eases
前記発電部の発電電力を検出して変化率演算部に入力し、且つこの変化率演算部 に前記電力系統の最大追従可能な電力変化量よりも小さい変化量となるような制限 値に設定された前記発電電力の正方向変化率設定値、及び負方向変化率設定値と を導入し、この変化率演算部の出力と発電部の発電電力検出値との差分を前記充 放電部の充放電指令値とすることを特徴としたものである。  The generated power of the power generation unit is detected and input to a change rate calculation unit, and the change rate calculation unit is set to a limit value smaller than the maximum changeable power change amount of the power system. Introducing the set value of the change rate in the positive direction and the set value of the change rate in the negative direction of the generated power, and calculating the difference between the output of the change rate calculator and the It is characterized in that it is a command value.
[0012] 本発明の別の観点によれば、電力系統と、この電力系統に接続される発電設備に 自然エネルギーを電気工ネルギ一に変換して電力を発電する発電部を連系し、この 電力系統および発電設備を有する系統と発電部との間に電力貯蔵部を有する充放 電部を接続し、電力貯蔵部に蓄えたエネルギーを充放電部で充電または放電制御 することにより前記発電部の出力と充放電部の出力とを加減算して電力の変動を緩 和するものにおいて、  According to another aspect of the present invention, an electric power system and a power generation unit for converting natural energy into electric energy to generate electric power are interconnected to a power generation facility connected to the electric power system. The charge / discharge unit having a power storage unit is connected between a power system and a power system having a power generation facility and a power generation unit, and the energy stored in the power storage unit is charge or discharge controlled by the charge / discharge unit. In the one that reduces the fluctuation of power by adding / subtracting the output of the charge / discharge unit and the output of the
前記発電部の発電電力を検出して変化率演算部に入力し、且つこの変化率演算部 に前記発電設備のガバナの最大追従可能な電力変化量よりも小さい変化量となるよ うな制限値に設定された前記発電電力の正方向変化率設定値、及び負方向変化率 設定値とを導入し、この変化率演算部の出力と発電部の発電電力検出値との差分を 前記充放電部の充放電指令値とすることを特徴としたものである。 The power generated by the power generation unit is detected and input to a change rate calculation unit, and the change rate calculation unit Introducing the set value of the change rate in the forward direction of the generated power and the set value of the change rate in the negative direction of the power generation set to a limit value such that the change amount is smaller than the maximum followable power change amount of the governor of the power generation facility. The difference between the output of the change rate calculation unit and the power generation detection value of the power generation unit is used as the charge / discharge command value of the charge / discharge unit.
[0013] 本発明の更に別の観点によれば、前記変化率演算部は、前回サンプリング時の変 化率制限部の演算値と 1サンプリング当たりの許容変化量上限値との和の値と、入力 された前記発電部の発電電力検出値とを比較し、発電部の発電電力検出値が大き レ、ときに前記和の値を変化率演算部の出力とすると共に、前回サンプリング時の変 化率制限部の演算値と 1サンプリング当たりの許容変化量下限値との差の値と、入力 された前記発電部の発電電力検出値とを比較し、発電部の発電電力検出値が小さ レ、ときに前記差の値を変化率演算部の出力とし、発電部の発電電力検出値が前記 和の値以下で、且つ前記差の値以上のときに前記発電電力検出値を変化率演算部 の出力とすることを特徴としたものである。  According to still another aspect of the present invention, the change rate calculation unit is a value of the sum of the calculation value of the change rate restriction unit at the time of the previous sampling and the allowable change amount upper limit value per one sampling; The power generation detection value of the power generation unit is compared with the input power generation detection value of the power generation unit, and when the power generation detection value of the power generation unit is large, the sum value is used as the output of the change rate calculation unit. The difference between the calculated value of the rate limiting unit and the lower limit value of allowable change per sampling is compared with the input detection value of generated power of the power generation unit, and the detected value of generated power of the generation unit is small, When the difference value is the output of the change rate calculation unit, and the generated power detection value of the power generation unit is less than or equal to the sum value and greater than or equal to the difference value, It is characterized in that it is an output.
[0014] 本発明の他の観点によれば、前記電力貯蔵部の残量を検出して制限値補正部に 出力し、この制限値補正部による補正値を前記正方向変化率設定値、及び負方向 変化率設定値としたことを特徴としたものである。 According to another aspect of the present invention, the remaining amount of the power storage unit is detected and output to the limit value correction unit, and the correction value by the limit value correction unit is set to the forward direction change rate setting value, It is characterized in that it is set as the negative change rate setting value.
[0015] 本発明の更に他の観点によれば、前記発電設備を、小水力発電設備、ディーゼル 発電設備又はガスエンジン発電設備としたことを特徴としたものである。 [0015] According to still another aspect of the present invention, the power generation facility is a small hydraulic power generation facility, a diesel power generation facility, or a gas engine power generation facility.
図面の簡単な説明  Brief description of the drawings
[0016] [図 1]本発明の第 1の実施形態を示す構成図。  FIG. 1 is a block diagram showing a first embodiment of the present invention.
[図 2]変化率演算部の構成図。  [FIG. 2] The block diagram of a change rate calculating part.
[図 3]変化率演算部の動作フローチャート。  [FIG. 3] An operation flowchart of the change rate calculation unit.
[図 4]電力変動緩和の比較図で、 (a)は平準化不実施時の発電機の負荷状態、(b) は変動緩和実施時の発電機の負荷状態図。  [Fig. 4] A comparison diagram of the power fluctuation mitigation, (a) shows the load condition of the generator when the leveling is not implemented, and (b) shows the load condition of the generator when the fluctuation mitigation is implemented.
[図 5]本発明の第 2の実施形態を示す構成図。  [FIG. 5] The block diagram which shows the 2nd Embodiment of this invention.
[図 6]本発明の第 3の実施形態を示す構成図。  FIG. 6 is a block diagram showing a third embodiment of the present invention.
[図 7]本発明の第 4の実施形態を示す構成図。  FIG. 7 is a block diagram showing a fourth embodiment of the present invention.
発明を実施するための最良の形態 [0017] 以下、図面を参照しつつ、本発明の実施の形態を詳細に説明する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0018] 図 1は、本発明の実施例を示す構成図である。 1は自然エネルギーを電気工ネルギ 一に変換して電力を発電する発電部で、ここでは太陽電池で示され、太陽電池の場 合には図示省略されてレ、るが複数並列設置されてレ、る。 2は DC/DCコンバータで 、太陽電池の出力電力が最大になるよう制御される。 3は充放電部で DC/DCコン バータ等より構成されている。 4は充放電部に接続された電力貯蔵部で、蓄電池や 電気二重層キャパシタ等が使用され、出力変動の急変には大電流出力が可能な電 気二重層キャパシタが好適である。 FIG. 1 is a block diagram showing an embodiment of the present invention. Reference numeral 1 denotes a power generation unit that converts natural energy into electric energy and generates electric power, which is shown here by a solar cell, and in the case of a solar cell, not shown, but a plurality of parallel installed parallel . A DC / DC converter 2 is controlled to maximize the output power of the solar cell. 3 is a charge / discharge unit which is composed of a DC / DC converter and so on. Reference numeral 4 denotes a power storage unit connected to the charge / discharge unit. A storage battery, an electric double layer capacitor, etc. are used, and an electric double layer capacitor capable of large current output is preferable for sudden change of output fluctuation.
[0019] 5は連系用のインバータで、発電部 1の発電出力若しくは電力貯蔵部 4によって貯 蔵された電力を連系する相手方の電圧と同じ大きさで、且つ同じ位相の交流電圧に 変換して連系する相手方の系統に逆潮流させる。 6は発電設備で、小水力発電設備 やディーゼル発電設備等が用いられ、発電設備の出力は変圧器 7を通って電力系 統に出力される。 8は負荷、 10は変化率演算部で、この変化率演算部 10は発電部 1 の発電電力検出値の変化率(1サンプリング当たりの変化量)に制限を持たせるため のもので、その制限値は電力系統に接続される発電設備 6の発電機用ガバナ、また は/および電力系統が最大追従可能な電力変化量よりも小さな変化率となるように 設定される。したがって、変化率演算部 10の出力は発電設備 6の発電機ガバナ、ま たは/および電力系統で追従可能な変動成分で、その出力は減算部 9において発 電部 1の発電電力検出値との差分がとられ、その信号の極性が正の場合には充放電 部 3に対する放電指令となり、負の極性時には充電指令となって充放電部 3に出力さ れる。 Reference numeral 5 denotes an inverter for interconnection, which converts the generated output of the power generation unit 1 or the electric power stored by the electric power storage unit 4 into an AC voltage of the same size and the same phase as the voltage of the other party to be interconnected. Then reverse power flow to the system of the connected partner. 6 is a power generation facility, which uses a small hydroelectric power generation facility, a diesel power generation facility, etc. The output of the power generation facility is output to the power system through the transformer 7. Reference numeral 8 is a load, 10 is a change rate calculation unit, and the change rate calculation unit 10 is for limiting the change rate (the amount of change per sampling) of the generated power detection value of the power generation unit 1. The value is set so that the change rate of the generator governor of the power generation facility 6 connected to the electric power system, and / or the electric power system can be smaller than the maximum amount of change in electric power. Therefore, the output of the change rate calculation unit 10 is a fluctuation component that can be followed by the generator governor of the power generation facility 6 and / or the power system, and the output thereof is detected by the power generation detection value of the generation unit 1 in the subtraction unit 9. When the polarity of the signal is positive, a discharge command to the charge / discharge unit 3 is given, and when the polarity is negative, the charge command is given to the charge / discharge unit 3.
[0020] なお、 DC/DCコンバータ 2は発電部 1が風力発電機で DCリンク方式の場合には AC/DCコンバータとなり、 ACリンク方式の場合にはコンバータ 2は不要となる。また 、 ACリンク方式の場合には、図 1で示すインバータ 5が双方向導通のインバータとし て構成され、充放電部 3で行われる充放電指令をインバータ 5で行レ、電力貯蔵部 4と 直列に接続されるか、若しくは、電力貯蔵部 4、充放電部 3と直列に接続され、これら 直列に接続された回路が発電設備 6と発電部 1との連系系統に接続される。  The DC / DC converter 2 is an AC / DC converter when the power generation unit 1 is a wind power generator and a DC link system, and the converter 2 is unnecessary in the AC link system. Further, in the case of the AC link system, the inverter 5 shown in FIG. 1 is configured as a bidirectionally conducting inverter, and charge / discharge commands performed by the charge / discharge unit 3 are lined with the inverter 5, and series with the power storage unit 4 The power storage unit 4 and the charge / discharge unit 3 are connected in series, and a circuit connected in series with each other is connected to an interconnection system of the power generation facility 6 and the power generation unit 1.
[0021] 図 2は変化率演算部 10のブロック図を示したものである。 11は自然エネルギーを 電気エネルギーに変換して電力を発電する発電部 1の発電電力検出値で、その検 出値は変化率制限部 20と減算部 9に出力される。 12は発電部 1による発電電力の 正方向変化率設定値、 13は負方向変化率設定値で、各設定値は発電設備 6または 電力系統が追従可能な許容変化率の上下限値となっている。 14は所定の時間間隔 で出力されるサンプリング信号、 16及び 17は乗算部で、乗算部 16はサンプリング信 号発生の都度、正方向変化率制限値を加算部 18に出力する。また、乗算部 17はサ ンプリング信号発生の都度、負方向変化率制限値を減算部 19に出力する。 15は遅 延部で、変化率演算部 10の出力となる変化率制限部 20の 1サンプリング前に演算さ れた演算値が記憶される。 FIG. 2 shows a block diagram of the change rate calculation unit 10. 11 is natural energy The detected value is output to the change rate limiting unit 20 and the subtracting unit 9 by the detected value of the generated power of the power generation unit 1 that converts the electric energy into electric power to generate power. 12 is a positive direction change rate set value of power generated by the power generation unit 1, 13 is a negative direction change rate set value, and each set value is an upper and lower limit value of allowable change rate that the power generation facility 6 or the power system can follow. There is. 14 is a sampling signal output at a predetermined time interval, and 16 and 17 are multiplication units. The multiplication unit 16 outputs a forward change rate limit value to the addition unit 18 each time a sampling signal is generated. Also, the multiplier 17 outputs the negative-direction change rate limit value to the subtractor 19 each time a sampling signal is generated. Reference numeral 15 denotes a delay unit, which stores the calculated value calculated one sampling before the change rate limiting unit 20 which is the output of the change rate computing unit 10.
[0022] なお、サンプリング間隔を変動周期に比べて短くし過ぎるとサンプリング間の変化率 が常に上下限値内に収まり補償動作が行われず、逆にサンプリング間隔を変動周期 に比べて長くし過ぎると補償が追いつかず、発電部の出力変動がそのまま電力系統 や負荷に出ることになる。そのため、サンプリング間隔は想定される最も短い発電部 1 の出力変動周期よりも長ぐ且つ出力変動がそのまま系統に出ても影響が出ない周 期よりも短く設定される。また、このサンプリング間隔の設定と同様に変化率の上下限 値の設定レベルが重要となり、これらを勘案して合理的に設定される。  If the sampling interval is too short compared to the fluctuation period, the rate of change between samplings will always fall within the upper and lower limit values, and the compensation operation will not be performed, conversely if the sampling interval is too long compared to the fluctuation period. Compensation can not catch up, and the output fluctuation of the power generation unit will be output to the power system and load as it is. Therefore, the sampling interval is set to be longer than the output fluctuation period of the shortest possible power generation unit 1 and shorter than the period in which the output fluctuation does not affect even if it is output to the system as it is. In addition, the setting level of the upper and lower limit value of the change rate becomes important as well as the setting of this sampling interval, and it is rationally set taking these into consideration.
[0023] 以上のように構成された本発明においてその作用を説明する。  The operation of the present invention configured as described above will be described.
自然エネルギーを電気エネルギーに変換して電力を発電する発電部 1の発電電力 は、インバータ 5に供給されて連系する相手方と同じ大きさの電圧で、且つ同じ位相 の交流電圧に変換されて連系する相手方に送出される。発電部 1の発電電力は図 示省略された検出部により検出され、変化率演算部 10の変化率制限部 20と減算部 9に出力される。変化率演算部 10には予め図示省略された設定部から発電電力の 正方向変化率設定値と負方向変化率設定値がそれぞれ入力される。各設定値は乗 算部 16と 17にそれぞれ印加され、サンプリング信号が発振されたときに加算部 18と 減算部 19にそれぞれ出力されて 1サンプリング前の演算値と加算及び減算が実行さ れる。その結果の各信号は変化率制限部 20に出力される。  The generated power of the power generation unit 1 that converts natural energy into electric energy and generates power is supplied to the inverter 5 and converted into an AC voltage of the same magnitude and phase as the partner to be interconnected, It is sent to the other party who is involved. The power generated by the power generation unit 1 is detected by a detection unit (not shown) and is output to the change rate limiting unit 20 and the subtraction unit 9 of the change rate calculation unit 10. The change ratio calculation unit 10 receives the set value of change in the positive direction and the set value of change in the negative direction of the generated power from the setting unit (not shown). Each set value is applied to multiplication units 16 and 17, respectively, and when the sampling signal is oscillated, it is output to addition unit 18 and subtraction unit 19 respectively, and the operation value one sampling before and addition and subtraction are executed. The resulting signals are output to change rate limiter 20.
[0024] 図 3は変化率制御部 20の動作フローを示したもので、ステップ S1では、入力された 発電部 1の発電電力検出値と加算部 18の出力信号との比較、すなわち、発電電力 検出値 PDと 1サンプリング前の演算値 +許容変化率の上限値 SULとの比較判定が 行われ、発電電力検出値が当該演算値と上限値との和より大きい場合にはステップ S3に移行して、変化率制御部 20の演算値 (変化率制御部 10の出力)を 1サンプリン グ前の値 +許容変化率 (加算部 18の出力 SUUとするための処理が実行される。 FIG. 3 shows an operation flow of the change rate control unit 20. In step S1, the generated power detection value of the power generation unit 1 and the output signal of the addition unit 18 are compared, ie, the generated power Comparison between the detection value PD and the calculated value before one sampling + upper limit value of allowable change rate SUL is performed. If the generated power detection value is larger than the sum of the calculated value and the upper limit, the process proceeds to step S3. Then, processing for setting the operation value of change rate control unit 20 (output of change rate control unit 10) to the value before sampling 1 + allowable change rate (output SUU of addition unit 18) is executed.
[0025] 一方、 S1で入力された発電電力が加算部 18の出力値より小さい場合、ステップ S2 に移行して発電部 1の発電電力と減算部 19の出力信号 SLLとの比較、すなわち、発 電電力検出値と 1サンプリング前の演算値一許容変化率の下限値との比較判定が行 われ、発電電力検出値が当該演算値と下限値との差より小さい場合にはステップ S4 に移行して、変化率制御部 20の演算値 (変化率制御部 10の出力〇V)を 1サンプリ ング前の演算値一許容変化率 (減算部 19の出力 SLL)とするための処理が実行され る。 On the other hand, when the generated power input in S1 is smaller than the output value of the adding unit 18, the process proceeds to step S2, and the generated power of the power generating unit 1 is compared with the output signal SLL of the subtracting unit 19, ie A comparison between the detected electric power value and the lower limit value of the calculated value before the sampling and the allowable change rate is performed. If the generated power detected value is smaller than the difference between the calculated value and the lower limit value, the process proceeds to step S4. A process is performed to convert the calculated value of change rate control unit 20 (output VV of change rate control unit 10) into the calculated value / permissible change rate of 1 sampling before (output SLL of subtraction unit 19). .
ステップ S2で発電電力検出値が減算部 19の出力値より大きい場合、ステップ 5で変 化率制御部 20の演算値 (変化率制御部 10の出力)を発電電力検出値 PDとするた めの処理が実行される。そして、変化率制御部 20の演算値 COVと発電電力検出値 PDとの減算を減算部 9において実行し、電力貯蔵部 4に対する充放電指令値として 充放電部 3に出力する。これにより、発電部 1の発電電力の変動分で、発電機 6の原 動機用ガバナの追従性を超えた分が電力貯蔵部 4の充放電指令値となり、発電部 1 の出力と電力貝宁蔵部 4の出力との和による電力変動分はガバナの追従可能な範囲 に抑えることができる。  If it is determined in step S2 that the generated power detection value is larger than the output value of the subtraction unit 19, then in step 5, the calculated value of the change rate control unit 20 (output of the change rate control unit 10) is used as the generated power detection value PD. Processing is performed. Then, the subtraction unit 9 subtracts the calculated value COV of the change rate control unit 20 and the generated power detection value PD, and outputs the result to the charge / discharge unit 3 as a charge / discharge command value for the power storage unit 4. As a result, the fluctuation of the power generated by the power generation unit 1 and the follow-up capability of the motor governor of the generator 6 become the charge / discharge command value of the power storage unit 4. The output of the power generation unit 1 and the power shell The power fluctuation due to the sum with the output of the storage unit 4 can be suppressed within the range that can be followed by the governor.
[0026] したがって、この実施例によれば、変化率演算部 10から出力される充放電量の指 令値は発電機 6のガバナが十分に追従できる電力変動内に抑えることが可能となつ たことにより系統連系点の電力は安定し、発電部 1の出力変動による電力系統への 悪影響はなくなる。  Therefore, according to this embodiment, it is possible to suppress the command value of the charge / discharge amount output from change rate calculation unit 10 within the power fluctuation that the governor of generator 6 can sufficiently follow. As a result, the power at the grid connection point becomes stable, and the output fluctuation of the power generation unit 1 will not adversely affect the power grid.
[0027] 図 4は、本発明による電力変動の緩和制御による発電機の負荷変動を示したもの で、(a)は電力変動緩和制御を実施しなかった場合、(b)は本発明による発電機の 負荷変動を示したものである。  [0027] FIG. 4 shows load fluctuation of the generator due to the power fluctuation mitigation control according to the present invention, where (a) is the power generation according to the present invention when power fluctuation mitigation control is not performed. It shows the load fluctuation of the aircraft.
[0028] 図 5は、他の実施例を示したもので、図 1の実施例との相違点は変化率制限値 (変 化率設定値)を電力貯蔵量に関連付けて可変するようにしたことである。すなわち、 2 1は電力貯蔵量の検出部で、この検出部によって検出された検出値は制限値補正部 22に出力される。制限値補正部 22は、電力貯蔵量に対する正方向変化率制限値と 負方向変化率制限値との補正量がテーブル状に形成され、貯蔵量に応じて各変化 率の制限値を設定している。他は前述の実施例と同じであるのでその説明を省略す る。 FIG. 5 shows another embodiment, and the difference with the embodiment of FIG. 1 is that the change rate limit value (change rate setting value) is made variable in relation to the amount of stored electric power. It is. That is, 2 Reference numeral 1 denotes a power storage amount detection unit, and the detection value detected by the detection unit is output to the limit value correction unit 22. Limit value correction unit 22 forms correction amounts of positive direction change rate limit value and negative direction change rate limit value with respect to electric power storage amount in the form of a table, and sets the limit value of each change rate according to the storage amount. There is. The other aspects are the same as those of the above-described embodiment, so the description thereof is omitted.
[0029] この実施例によれば、電力貝宁蔵部の残量を考慮した変化率の上限、下限が設定さ れるので、より安定した電力の制御が可能となる。  According to this embodiment, since the upper limit and the lower limit of the change rate are set in consideration of the remaining amount of the power storage unit, more stable power control is possible.
[0030] 図 6は、図 1の構成から発電設備 6を取り除き、発電部 1を電力系統に連系した場合 の実施例を示したものである。この実施例での変化率演算部 10は、発電部 1の発電 電力検出値の変化率に制限を持たせるために、連系された電力系統の最大追従可 能な電力変化量よりも小さい変化量となるように設定される。その制御は、図 1〜図 3 と同様であるので説明は省略する。また、図 5のように、変化率演算部 10に電力貯蔵 量検出部 21及び制限値補正部 22を追加してもよいことは勿論である。  FIG. 6 shows an embodiment in the case where the power generation facility 6 is removed from the configuration of FIG. 1 and the power generation unit 1 is connected to the electric power system. In order to impose a limit on the rate of change of the detection value of the generated power of the power generation unit 1, the change rate calculation unit 10 in this embodiment is smaller than the changeable power change amount of the interconnected power system. Set to be an amount. The control is the same as in FIG. 1 to FIG. Further, as shown in FIG. 5, it is needless to say that the power storage amount detection unit 21 and the limit value correction unit 22 may be added to the change rate calculation unit 10.
[0031] この実施例によれば、電力系統が追従できる電力変動内に抑えることができるので 、この電力系統に接続される負荷への電力変動が緩和できるものである。また、発電 部 1を電力系統と連系した場合において、発電部 1の出力に対して、例えば、離島の ような小規模な電力系統で発電部出力の依存度が高い場合、または電力系統の末 端で系統内の協調が得難い場合など、発電部 1の出力変動の影響を受け易く出力 変動が大きくなる。しかし、本発明では、このような場合でも電力系統の出力が安定し 、電力変動緩和制御による効果が顕著となるものである。  According to this embodiment, since it can be suppressed within the power fluctuation that the power system can follow, the power fluctuation to the load connected to this power system can be alleviated. In addition, when the power generation unit 1 is interconnected with the power system, for example, when the power generation unit output is highly dependent on the power generation unit 1 output in a small power system such as a remote island, or The output fluctuation is likely to be affected by the output fluctuation of the power generation unit 1, for example, when coordination within the system is difficult to obtain at the end. However, in the present invention, the output of the power system is stable even in such a case, and the effect of the power fluctuation mitigation control becomes remarkable.
[0032] 図 7は、図 1又は図 5の実施例に電力系統を連系した場合の実施例を示したもので ある。この実施例での変化率演算部 10も、図 1などで示す実施例と同様に、発電部 1 の発電電力検出値の変化率に制限を持たせるために、発電設備の発電機用ガバナ が最大追従可能な電力変化量よりも小さい変化量となるように設定され、且つ図 1な どで示す実施例と同様の演算が実施されて充放電指令値が出力される。  FIG. 7 shows an embodiment in the case where a power system is linked to the embodiment of FIG. 1 or FIG. Similarly to the embodiment shown in FIG. 1 and the like, the change rate calculation unit 10 in this embodiment also has a generator governor for power generation equipment in order to limit the change rate of the generated power detection value of the power generation unit 1. A change amount smaller than the maximum followable power change amount is set, and the same calculation as in the embodiment shown in FIG. 1 and the like is performed to output a charge / discharge command value.
[0033] この実施例によれば、発電設備の発電機用ガバナが追従できる電力変動内に抑え ることができるので、他の電力系統に接続される負荷への電力変動が緩和できるもの である。 なお、図 6で示す実施例以外での発電設備 6としては、発電設備であれば特に限定 するものではないが、特に小水力発電設備、ディーゼル発電設備又はガスエンジン 発電設備とした場合、従来力 備えているガバナによる出力調整機能の利用が可能 となる。これによつて、既設の小水力発電設備、ディーゼル発電設備又はガスェンジ ン発電設備への電力変動の緩和制御の適用が可能である。また、小水力発電設備 、ディーゼル発電設備又はガスエンジン発電設備を併用した発電システムとしたこと で、発電部からの電力潮流を一定に保持できると共に、発電部を太陽光発電するこ とで日中の前記発電設備の発電電力を低減し、夜間の発電設備による発電電力を 増加させて、太陽光発電と発電設備との相互補完効果を得ることができる。 According to this embodiment, since it can be suppressed within the power fluctuation that can be followed by the generator governor of the power generation facility, the power fluctuation to the load connected to the other power system can be mitigated. . The power generation equipment 6 other than the embodiment shown in FIG. 6 is not particularly limited as long as it is a power generation equipment, but in the case of a small hydraulic power generation equipment, a diesel power generation equipment or a gas engine power generation equipment, It is possible to use the output adjustment function by the included governor. As a result, it is possible to apply mitigation control of power fluctuation to existing small hydro power generation facilities, diesel power generation facilities or gas engine power generation facilities. In addition, by using a small hydroelectric power generation facility, a diesel power generation facility, or a gas engine power generation system in combination, power flow from the power generation unit can be kept constant, and the power generation unit can generate solar power. By reducing the power generated by the power generation facility and increasing the power generated by the power generation facility at night, it is possible to obtain a complementary effect between the solar power generation and the power generation facility.
[0034] 以上のとおり、本発明によれば、変化率演算部の出力と発電部の発電電力検出値 との差分となる充放電量の指令値は、異常な検出値が入力された場合でも当該異常 値以降の指令値に影響せず、発電設備の発電機用ガバナまたは/および電力系統 が十分に追従できる範囲内に電力変動を抑えたことにより、発電設備または/およ び電力系統に発電部を連系したときの電力は安定し、発電部の出力変動による電力 系統、発電設備または負荷への悪影響は緩和される。 As described above, according to the present invention, the command value of the charge / discharge amount, which is the difference between the output of the change rate calculation unit and the power generation detection value of the power generation unit, is an abnormal detection value. By suppressing power fluctuations within the range where the generator governor and / or power system of the power generation facility can sufficiently follow without affecting the command value after the abnormal value, it is possible to When the power generation unit is connected, the power is stabilized, and the adverse effect on the power system, the power generation facility or the load due to the output fluctuation of the power generation unit is mitigated.
[0035] また、電力変動の緩和制御のために、変化率の演算信号を用いているので、移動平 均を用いたものと比較すると加減算と比較とがそれぞれ 2回と前回値を 1つ記憶する だけでよいため、少ない演算で電力変動の緩和制御が可能となり、電力変動に即応 した追従制御が可能になる。且つ、移動平均 ·高域フィルタを用いる方法と比較して 、発電部における発電電力の変動量が大きい場合でも電力貯蔵部を充放電制御す ることで、変動緩和後の電力変動を発電機用ガバナまたは/および電力系統が追 従できる範囲内に抑えることができるので電力品質の向上が図れる。  Further, since the calculation signal of the change rate is used to control the power fluctuation, two additions and two comparisons and one previous value are stored as compared with those using the moving average. Since it is only necessary to do so, it is possible to control the power fluctuation with a small amount of calculation, and follow-up control can be performed promptly in response to the power fluctuation. And, compared to the method using moving average and high-pass filter, even if the amount of fluctuation of generated power in the generator is large, charge and discharge control of the power storage unit allows power fluctuation after fluctuation mitigation for the generator. Power quality can be improved because the governor and / or power system can be kept within the range that can be followed.
[0036] さらに、電力系統や発電設備と電力貝宁蔵部とを協調した電力変動の緩和制御とする ことで、発電設備を取り除いて発電部を電力系統に接続したときには、電力系統が追 従できる範囲内に電力変動を抑えることで系統に接続される負荷への電力変動を緩 和することができ、発電設備が電力系統に接続されたときには、発電設備の発電機 用ガバナが追従できる範囲内に電力変動内に抑えることで、系統に接続される負荷 及び電力系統への電力変動の波及はなくなる。そして、前記の協調を行うことで、電 力系統や発電設備が応答出来ない時間のみ電力貯蔵部で補償すれば良いので電 力貯蔵部の設備容量を小さくすることが出来る。 Furthermore, when the power generation facility is removed and the power generation unit is connected to the power system, the power system is added to the power system by reducing the power fluctuation by coordinating the power system or the power generation facility with the power shell storage unit. By suppressing the power fluctuation within the possible range, the power fluctuation to the load connected to the grid can be mitigated, and when the power generation facility is connected to the power grid, the range where the generator governor for the power generation facility can follow By keeping the power fluctuation within, there is no spread of the power fluctuation to the load connected to the grid and the power grid. And, by performing the above-mentioned coordination, The capacity of the power storage unit can be reduced because the power storage unit only needs to compensate for the time when the power system and the power generation facility can not respond.
また、小水力発電設備、ディーゼル発電設備又はガスエンジン発電設備とした場合 、本発明の電力変動の緩和制御は、前記発電設備が従来力 備えているガバナに よる出力調整機能の利用が可能となり、既設のこれら発電設備への適用が可能であ る。そのうえ、小水力発電設備、ディーゼル発電設備又はガスエンジン発電設備を併 用した発電システムとすることで、発電部からの電力潮流を一定に保持できると共に 発電部を太陽光発電することで、 日中の前記発電設備の発電電力を低減し、夜間の 発電設備による発電電力を増加させて、太陽光発電と発電設備との相互補完効果を 得ること力 Sできる。 Further, in the case of a small hydraulic power generation facility, a diesel power generation facility, or a gas engine power generation facility, the power fluctuation mitigation control of the present invention makes it possible to use the power adjustment function by the governor which the power generation facility conventionally comprises. It can be applied to existing power generation facilities. Moreover, by using a small hydroelectric power generation facility, a diesel power generation facility, or a gas engine power generation system as a power generation system, it is possible to maintain a constant power flow from the power generation unit and generate solar power from the power generation unit. It is possible to reduce the power generated by the power generation facility and increase the power generated by the power generation facility at night to obtain a complementary effect between the solar power generation and the power generation facility.
なお、発電部が電力系統と連系した場合において、発電部と接続する電力系統が小 規模な場合や発電部と接続する電力系統が末端にある場合には、当該電力系統は 発電部の出力変動の影響を受け易いが、本発明の出力変動緩和制御によって電力 系統の出力は安定し、出力変動抑制の効果が顕著となる。 When the power generation unit is linked to the power grid, if the power grid connected to the power generation unit is small in scale or if the power grid connected to the power generation unit is at the end, the power grid is the output of the power generation unit. Although it is susceptible to fluctuation, the output fluctuation mitigation control of the present invention stabilizes the output of the power system, and the effect of output fluctuation suppression becomes remarkable.

Claims

請求の範囲 The scope of the claims
[1] 電力系統から独立した発電設備に自然エネルギーを電気工ネルギ一に変換して電 力を発電する発電部を連系し、この発電設備と発電部との間に電力貝宁蔵部を有する 充放電部を接続し、電力貯蔵部に蓄えたエネルギーを充放電部で充電または放電 制御することにより前記発電部の出力と充放電部の出力とを加減算して電力の変動 を緩和するものにおいて、  [1] A power generation unit that converts natural energy into electric energy and generates electric power is interconnected to a power generation facility independent of the power system, and the power shell storage unit is connected between the power generation facility and the power generation unit. Connect the charge / discharge unit, charge / discharge control the energy stored in the power storage unit by the charge / discharge unit, add / subtract the output of the power generation unit and the output of the charge / discharge unit, and reduce the fluctuation of the power In
前記発電部の発電電力を検出して変化率演算部に入力し、且つこの変化率演算 部に前記発電設備のガバナの最大追従可能な電力変化量よりも小さい変化量となる ような制限値に設定された前記発電電力の正方向変化率設定値、及び負方向変化 率設定値とを導入し、この変化率演算部の出力と発電部の発電電力検出値との差分 を前記充放電部の充放電指令値とすることを特徴とした自然エネルギーを利用した 発電システムに用いる新エネルギー発電システム出力変動緩和装置。  The generated power of the power generation unit is detected and input to the change rate calculation unit, and the change rate calculation unit is set to a limit value such that the change amount is smaller than the maximum changeable power change amount of the governor of the power generation facility. The set value of the change rate in the positive direction and the set value of the change rate in the negative direction of the generated power are introduced, and the difference between the output of the change rate calculation unit and the detected value of the generated power of the power generation unit A new energy generation system output fluctuation mitigating device used for a power generation system that uses natural energy, which is characterized by using charge and discharge command values.
[2] 電力系統に自然エネルギーを電気エネルギーに変換して電力を発電する発電部を 連系し、この電力系統と発電部との間に電力貯蔵部を有する充放電部を接続し、電 力貯蔵部に蓄えたエネルギーを充放電部で充電または放電制御することにより前記 発電部の出力と充放電部の出力とを加減算して電力の変動を緩和するものにおレ、て 前記発電部の発電電力を検出して変化率演算部に入力し、且つこの変化率演算 部に前記電力系統の最大追従可能な電力変化量よりも小さい変化量となるような制 限値に設定された前記発電電力の正方向変化率設定値、及び負方向変化率設定 値とを導入し、この変化率演算部の出力と発電部の発電電力検出値との差分を前記 充放電部の充放電指令値とすることを特徴とした自然エネルギーを利用した発電シ ステムに用いる新エネルギー発電システム出力変動緩和装置。  [2] Connect a power generation unit that converts natural energy into electric energy and generates power by connecting to a power system, connect a charge / discharge unit with a power storage unit between this power system and the power generation unit, The energy stored in the storage unit is controlled by charging or discharging in the charge / discharge unit, thereby adding / subtracting the output of the power generation unit and the output of the charge / discharge unit to reduce the fluctuation of the electric power. The generated power is detected and input to a change rate calculation unit, and the change rate calculation unit is set to a limit value such that the change amount is smaller than the maximum changeable power change amount of the power system. Introducing the forward direction change rate setting value and the negative direction change rate setting value of electric power, the difference between the output of the change rate operation unit and the generated power detection value of the power generation unit with the charge / discharge command value of the charge / discharge unit. Power generation system using natural energy New energy generation system output fluctuation mitigating device used for the stem.
[3] 電力系統と、この電力系統に接続される発電設備に自然エネルギーを電気工ネルギ 一に変換して電力を発電する発電部を連系し、この電力系統および発電設備を有す る系統と発電部との間に電力貯蔵部を有する充放電部を接続し、電力貯蔵部に蓄え たエネルギーを充放電部で充電または放電制御することにより前記発電部の出力と 充放電部の出力とを加減算して電力の変動を緩和するものにおいて、 前記発電部の発電電力を検出して変化率演算部に入力し、且つこの変化率演算 部に前記発電設備のガバナの最大追従可能な電力変化量よりも小さい変化量となる ような制限値に設定された前記発電電力の正方向変化率設定値、及び負方向変化 率設定値とを導入し、この変化率演算部の出力と発電部の発電電力検出値との差分 を前記充放電部の充放電指令値とすることを特徴とした自然ェネルギーを利用した 発電システムに用いる新エネルギー発電システム出力変動緩和装置。 [3] A power grid and a grid having a power grid and a power generation facility that interconnects a power generation unit that converts natural energy into electric energy and generates electric power in a power generation facility connected to the power grid. The charge / discharge unit having the power storage unit is connected between the power generation unit and the power generation unit, and the energy stored in the power storage unit is charged or discharged by the charge / discharge unit to control the output of the power generation unit and the output of the charge / discharge unit. To reduce power fluctuation by adding or subtracting The generated power of the power generation unit is detected and input to the change rate calculation unit, and the change rate calculation unit is set to a limit value such that the change amount is smaller than the maximum changeable power change amount of the governor of the power generation facility. The set value of the change rate in the positive direction and the set value of the change rate in the negative direction of the generated power are introduced, and the difference between the output of the change rate calculation unit and the detected value of the generated power of the power generation unit A new energy generation system output fluctuation mitigating device used for a power generation system that uses natural energy, which is characterized by using charge and discharge command values.
[4] 前記変化率演算部は、前回サンプリング時の変化率制限部の演算値と 1サンプリン グ当たりの許容変化量上限値との和の値と、入力された前記発電部の発電電力検出 値とを比較し、発電部の発電電力検出値が大きいときに前記和の値を変化率演算部 の出力とすると共に、前回サンプリング時の変化率制限部の演算値と 1サンプリング 当たりの許容変化量下限値との差の値と、入力された前記発電部の発電電力検出 値とを比較し、発電部の発電電力検出値が小さいときに前記差の値を変化率演算部 の出力とし、発電部の発電電力検出値が前記和の値以 [4] The change rate calculation unit is a value of the sum of the calculation value of the change rate limitation unit at the time of the previous sampling and the allowable change amount upper limit value per one sampling, and the generated power detection value of the power generation unit input. When the power generation detection value of the power generation unit is large, the sum value is used as the output of the change rate calculation unit, and the calculated value of the change rate restriction unit at the previous sampling and the allowable change per sampling The value of the difference from the lower limit value is compared with the input detection value of the generated power of the power generation unit, and when the detected value of the generated power of the power generation unit is small, the value of the difference is taken as the output of the change rate calculation unit The power generation detection value of the
下で、且つ前記差の値以上のときに前記発電電力検出値を変化率演算部の出力と することを特徴とした請求項 1乃至 3記載の自然エネルギーを利用した発電システム に用いる新エネルギー発電システム出力変動緩和装置。  The power generation system according to any one of claims 1 to 3, characterized in that the generated power detection value is used as an output of the change rate calculation unit when the generated power value is lower than the difference value or more than the difference value. System output fluctuation mitigation device.
[5] 前記電力貯蔵部の残量を検出して制限値補正部に出力し、この制限値補正部によ る補正値を前記正方向変化率設定値、及び負方向変化率設定値としたことを特徴と した請求項 1乃至 4記載の自然エネルギーを利用した発電システムに用いる新エネ ルギー発電システム出力変動緩和装置。  [5] The remaining amount of the power storage unit is detected and output to the limit value correction unit, and the correction value by the limit value correction unit is set as the forward direction change rate set value and the negative direction change rate set value. The new energy generation system output fluctuation mitigating device for use in a power generation system using natural energy according to any one of claims 1 to 4, characterized in that:
[6] 前記発電設備を、小水力発電設備、ディーゼル発電設備又はガスエンジン発電設 備としたことを特徴とした請求項 1又は 3乃至 5記載の自然エネルギーを利用した発 電システムに用いる新エネルギー発電システム出力変動緩和装置  [6] A new energy used for a power generation system using natural energy according to any one of claims 1 to 5, characterized in that the power generation facility is a small hydro power facility, a diesel power facility or a gas engine power facility. Power generation system output fluctuation mitigation device
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