JP5127513B2 - Output fluctuation suppression device for natural energy generator - Google Patents

Output fluctuation suppression device for natural energy generator Download PDF

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JP5127513B2
JP5127513B2 JP2008055764A JP2008055764A JP5127513B2 JP 5127513 B2 JP5127513 B2 JP 5127513B2 JP 2008055764 A JP2008055764 A JP 2008055764A JP 2008055764 A JP2008055764 A JP 2008055764A JP 5127513 B2 JP5127513 B2 JP 5127513B2
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操 木村
仁 韮沢
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Toshiba Corp
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Description

本発明は、商用系統と自然エネルギー発電装置との間に接続され自然エネルギー発電装置の出力変動を抑制する自然エネルギー発電装置の出力変動抑制装置に関する。   The present invention relates to an output fluctuation suppressing device for a natural energy power generation apparatus that is connected between a commercial system and a natural energy power generation apparatus and suppresses output fluctuation of the natural energy power generation apparatus.

近年、風力発電装置や太陽光発電装置のような自然エネルギーを利用する自然エネルギー発電装置が商用系統に連系されるようになっている。一般に、自然エネルギー発電装置は出力が不安定であるので、出力電力変動を平滑化するようにしている。   In recent years, natural energy power generation devices that use natural energy, such as wind power generation devices and solar power generation devices, have been linked to commercial systems. In general, since the output of a natural energy power generation apparatus is unstable, output power fluctuations are smoothed.

図６は従来の出力変動抑制装置の構成図である。出力変動抑制装置３は商用系統１と自然エネルギー発電装置２との間に接続される。自然エネルギー発電装置２から出力される有効電力は電力検出器８ａで検出され出力変動抑制装置３の変動抑制制御装置４に入力される。   FIG. 6 is a configuration diagram of a conventional output fluctuation suppressing device. The output fluctuation suppressing device 3 is connected between the commercial system 1 and the natural energy power generation device 2. The active power output from the natural energy power generation device 2 is detected by the power detector 8 a and input to the fluctuation suppression control device 4 of the output fluctuation suppression device 3.

変動抑制制御装置４の移動平均演算手段１１は、電力検出器８ａの出力信号を入力して移動平均値を演算し、減算器１５で移動平均値と電力検出器８ａの出力信号との差分を演算し変換器制御装置７に出力する。変換器制御装置７は移動平均値と電力検出器８ａの出力信号との差分に基づいて、電力貯蔵部６に貯蔵された電力を電力変換器５で変換し商用系統１に出力する。なお、電力検出器８ｂは電力変換器５から商用系統１に出力される有効電力を検出するものであり、電力変換器５の有効電力が変動抑制制御装置４の出力信号と等しくなるように制御するために変換器制御装置７に入力される。   The moving average calculation means 11 of the fluctuation suppression control device 4 calculates the moving average value by inputting the output signal of the power detector 8a, and the subtractor 15 calculates the difference between the moving average value and the output signal of the power detector 8a. Calculate and output to the converter controller 7. Based on the difference between the moving average value and the output signal of the power detector 8 a, the converter control device 7 converts the power stored in the power storage unit 6 by the power converter 5 and outputs it to the commercial system 1. The power detector 8b detects the active power output from the power converter 5 to the commercial system 1, and is controlled so that the active power of the power converter 5 is equal to the output signal of the fluctuation suppression control device 4. In order to do so, it is input to the converter controller 7.

このように、従来の出力変動抑制装置では、自然エネルギー発電装置２の出力変化を移動平均演算手段１１で鈍化させたものと、自然エネルギー発電装置２の出力との差分に応じて電力変換器５で充放電するようにしている。   As described above, in the conventional output fluctuation suppressing device, the power converter 5 according to the difference between the output change of the natural energy power generation device 2 made slow by the moving average calculation means 11 and the output of the natural energy power generation device 2. To charge and discharge.

図７は自然エネルギー発電装置２の出力が急減したときの出力変動抑制装置の信号波形図である。図７に示すように、自然エネルギー発電装置２の出力が時点ｔ１で急減したとすると、移動平均演算手段１１の出力は時間をかけて追従する特性となる。従って、電力変換器５による充放電量である、自然エネルギー発電装置２の出力と移動平均演算手段１１の出力との差分はある期間正の値（放電）となる。その間、商用系統１への出力電力は移動平均演算手段１１の出力と等しい変動の小さいものになるとともに電力貯蔵部６の残量は減少し続ける。   FIG. 7 is a signal waveform diagram of the output fluctuation suppressing device when the output of the natural energy power generation device 2 suddenly decreases. As shown in FIG. 7, if the output of the natural energy power generation device 2 suddenly decreases at the time point t1, the output of the moving average calculation means 11 has a characteristic of following over time. Therefore, the difference between the output of the natural energy power generation device 2 and the output of the moving average calculation means 11, which is the charge / discharge amount by the power converter 5, becomes a positive value (discharge) for a certain period. In the meantime, the output power to the commercial system 1 has a small variation equal to the output of the moving average calculation means 11 and the remaining amount of the power storage unit 6 continues to decrease.

逆に、図８のように自然エネルギー発電装置２の出力が時点ｔ１で急増したとすると、電力変換器５による充放電量である、自然エネルギー発電装置２の出力と移動平均演算手段１１の出力の差分はある期間負の値（充電）となる。その間、商用系統１への出力電力は移動平均演算手段１１の出力と等しい変動の小さいものになるとともに、電力貯蔵部６の残量は増加し続ける。   On the other hand, if the output of the natural energy power generation device 2 suddenly increases at the time t1 as shown in FIG. 8, the output of the natural energy power generation device 2 and the output of the moving average calculation means 11 are the charge / discharge amount by the power converter 5. Is a negative value (charge) for a certain period. In the meantime, the output power to the commercial system 1 has a small fluctuation equal to the output of the moving average calculation means 11, and the remaining amount of the power storage unit 6 continues to increase.

風力発電装置や太陽光発電装置などの分散電源による電力系統への出力変動を平滑化するものとしては、分散電源の出力と蓄電部の蓄電量を検出し、分散電源の出力の予め設定された期間の移動平均値を蓄電量に応じて予め設定された出力目標調整値で補正して、電力系統側への出力目標値を設定し、分散電源の出力が出力目標値よりも大きいときは、その余剰分を蓄電部に充電し、出力目標値よりも小さいときは、その不足分を蓄電部から放電して、電力系統側への出力が出力目標値になるように制御するようにしたものがある（例えば、特許文献１参照）。
特開２００２−１７０４４号公報 For smoothing output fluctuations to the power system by distributed power sources such as wind power generators and solar power generators, the output of the distributed power source and the amount of power stored in the power storage unit are detected, and the output of the distributed power source is preset. Correct the moving average value of the period with the output target adjustment value set in advance according to the amount of stored electricity, set the output target value to the power system side, and when the output of the distributed power source is larger than the output target value, The power storage unit is charged with the surplus, and when it is smaller than the output target value, the shortage is discharged from the power storage unit so that the output to the power system side is controlled to the output target value. (For example, refer to Patent Document 1).
JP 2002-17044 A

ところが、従来の出力変動抑制装置においては、自然エネルギー発電装置２の出力変動及び移動平均演算手段１１の設定によっては放電または充電が長く続くことがある。また、充放電量には偏りが生じるため、電力貯蔵部６の残量が充放電末に達して充放電による変動抑制ができなくなることがある。   However, in the conventional output fluctuation suppression device, depending on the output fluctuation of the natural energy power generation device 2 and the setting of the moving average calculation means 11, discharge or charging may continue for a long time. Moreover, since the amount of charging / discharging is biased, the remaining amount of the power storage unit 6 may reach the end of charging / discharging, and fluctuation suppression due to charging / discharging may not be possible.

そこで、特許文献１のものでは、分散電源の出力が出力目標値よりも大きいときは、その余剰分を蓄電部に充電し、出力目標値よりも小さいときは、その不足分を蓄電部から放電して、電力系統側への出力が出力目標値になるように制御しているが、出力目標値は蓄電部の蓄電量に応じて調整されるので、蓄電部の残量が充放電末に達したかどうかの確認はできていない。   Therefore, in Patent Document 1, when the output of the distributed power source is larger than the output target value, the surplus is charged into the power storage unit, and when the output is smaller than the output target value, the shortage is discharged from the power storage unit. Therefore, the output to the power system is controlled so as to become the output target value, but the output target value is adjusted according to the amount of power stored in the power storage unit, so the remaining amount of the power storage unit is at the end of charge / discharge It has not been confirmed whether it has been reached.

本発明の目的は、電力貯蔵部の残量が充放電末に達しにくくするとともに、充放電末に達した場合は速やかに変動抑制制御が可能な状態に復帰することのできる自然エネルギー発電装置の出力変動抑制装置を得ることである。   The object of the present invention is to make the remaining amount of the power storage unit difficult to reach the end of charging / discharging, and when it reaches the end of charging / discharging, a natural energy power generation device that can quickly return to a state in which fluctuation suppression control is possible. An output fluctuation suppressing device is obtained.

本発明に係わる自然エネルギー発電装置の出力変動抑制装置は、電力を貯蔵するための電力貯蔵部の電力を放電または充電する電力変換器と、自然エネルギー発電装置の出力変動値を平滑化して系統出力基準値とする移動平均演算手段と、前記電力貯蔵部のエネルギー残量と残量基準との差分から系統出力基準値の補正量を算出し系統出力基準値に補正を加える補正値演算手段と、前記電力貯蔵部のエネルギー残量から放電末を検出する放電末検出手段と、前記放電末検出手段で放電末が検出された場合に前記補正値演算手段で算出された補正量に基づき系統出力基準値を増加させる放電末対応手段と、前記充電末検出手段で充電末が検出された場合に前記補正値演算手段で算出された補正量に基づき系統出力基準値を減少させる充電末対応手段と、前記系統出力基準値と自然エネルギー発電装置の出力の差分を指令値として前記電力変換器の出力を制御する変換器制御装置とを備えたことを特徴とする。
An output fluctuation suppressing device for a natural energy power generation apparatus according to the present invention includes a power converter that discharges or charges power in a power storage unit for storing electric power, and a system output by smoothing an output fluctuation value of the natural energy power generation apparatus. A moving average calculating means as a reference value; a correction value calculating means for calculating a correction amount of the system output reference value from the difference between the remaining energy and the remaining capacity reference of the power storage unit and correcting the system output reference value; Discharge end detection means for detecting the end of discharge from the remaining energy of the power storage unit, and system output reference based on the correction amount calculated by the correction value calculation means when the discharge end is detected by the discharge end detection means a discharge end corresponding means of increasing the value, the correction value charging end corresponding to reduce the channel output reference value based on the correction amount calculated by the calculating means when the charging end is detected by the charging end detection means And the step, characterized by comprising a transducer controller for controlling the output of the power converter a difference output of the line output reference value and the natural energy power generation device as a command value.

本発明によれば、電力貯蔵部の残量が充放電末に達しにくくするとともに、充放電末に達した場合は速やかに変動抑制制御が可能な状態に復帰することのできる自然エネルギー発電装置の出力変動抑制装置を得ることができる。   According to the present invention, it is difficult for the remaining amount of the power storage unit to reach the end of charging / discharging, and when the end of charging / discharging reaches the end of charging / discharging, the natural energy power generation device capable of quickly returning to a state in which fluctuation suppression control is possible. An output fluctuation suppressing device can be obtained.

図１は本発明の実施の形態に係わる自然エネルギー発電装置の出力変動抑制装置の構成図である。商用系統１には太陽光発電などの自然エネルギー発電装置２が接続されている。出力変動抑制装置３は、商用系統１と自然エネルギー発電装置２との間に位置し、自然エネルギー発電装置２の出力変動を抑制するものである。自然エネルギー発電装置２から出力される有効電力は電力検出器８ａで検出され出力変動抑制装置３に入力される。   FIG. 1 is a configuration diagram of an output fluctuation suppressing device for a natural energy power generation device according to an embodiment of the present invention. A natural energy power generation device 2 such as solar power generation is connected to the commercial system 1. The output fluctuation suppression device 3 is located between the commercial system 1 and the natural energy power generation device 2 and suppresses output fluctuation of the natural energy power generation device 2. The active power output from the natural energy power generation device 2 is detected by the power detector 8 a and input to the output fluctuation suppressing device 3.

出力変動抑制装置３は、変動抑制制御装置４と、電力変換器５と、電力貯蔵部６と、変換器制御装置７と、電力検出器８ｂと、残量検出器９とから構成される。電力貯蔵部６は出力変動抑制に必要な電力を貯蔵するものであり、電力貯蔵部６の電力貯蔵量は残量検出器９で検出され変動抑制制御装置４に入力される。変動抑制制御装置４は電力検出器８ａの出力信号と残量検出器９の出力信号とに基づいて、出力変動抑制するための指令を変換器制御装置７に出力する。電力検出器８ｂは電力変換器５から入出力される電力を検出するものであり、変換器制御装置７は電力検出器８ｂの出力信号と変動抑制制御装置４の出力信号に基づいて、電力変換器５を制御し、電力貯蔵部６に貯蔵された電力を商用系統１に出力する。   The output fluctuation suppression device 3 includes a fluctuation suppression control device 4, a power converter 5, a power storage unit 6, a converter control device 7, a power detector 8 b, and a remaining amount detector 9. The power storage unit 6 stores power necessary for output fluctuation suppression, and the power storage amount of the power storage unit 6 is detected by the remaining amount detector 9 and input to the fluctuation suppression control device 4. The fluctuation suppression control device 4 outputs a command for suppressing the output fluctuation to the converter control device 7 based on the output signal of the power detector 8a and the output signal of the remaining amount detector 9. The power detector 8b detects power input / output from the power converter 5, and the converter control device 7 converts power based on the output signal of the power detector 8b and the output signal of the fluctuation suppression control device 4. The device 5 is controlled to output the power stored in the power storage unit 6 to the commercial system 1.

また、変動抑制制御装置４の移動平均演算手段１１は、電力検出器８ａの出力信号を入力して移動平均値を演算し、系統出力基準値として加算器１８ａに出力する。補正値演算手段２４は残量検出器９の出力信号に基づいて系統出力基準値の補正値を演算するものであり、残量検出器９の出力信号と残量基準値Ｒｒｅｆとの差分を減算器１５ａで演算し、その差分が不感帯１６の設定値の範囲を逸脱したときに、その逸脱量に応じた信号を乗算器１７に出力し、乗算器１７では定数設定手段１４に設定された係数を乗算して補正信号として加算器１８ａに出力する。   Moreover, the moving average calculating means 11 of the fluctuation suppression control device 4 receives the output signal of the power detector 8a, calculates a moving average value, and outputs it to the adder 18a as a system output reference value. The correction value calculation means 24 calculates the correction value of the system output reference value based on the output signal of the remaining amount detector 9, and subtracts the difference between the output signal of the remaining amount detector 9 and the remaining amount reference value Rref. When the difference deviates from the set value range of the dead zone 16, the signal corresponding to the deviation is output to the multiplier 17, and the multiplier 17 uses the coefficient set in the constant setting means 14. Is output to the adder 18a as a correction signal.

放電末検出手段１２は残量検出器９の出力信号を入力し、電力貯蔵部６の貯蔵された電力が放電末であることを検出する。放電末検出手段１２は残量検出器９の出力信号が放電末レベルであるか否かを判定するためのレベル検出器２２ａ、２２ｂと、放電末レベルであることを検出するレベル検出器２２ａの出力信号をセット信号とし、放電末レベルを回復したことを検出するレベル検出器２２ｂの出力信号をリセット信号とするフリップフロップ２３ａとから構成される。   The discharge end detection means 12 receives the output signal of the remaining amount detector 9 and detects that the power stored in the power storage unit 6 is the end of discharge. The end-of-discharge detection means 12 includes level detectors 22a and 22b for determining whether or not the output signal of the remaining amount detector 9 is at the end-of-discharge level, and a level detector 22a that detects the end-of-discharge level. The flip-flop 23a uses the output signal as a set signal and the output signal from the level detector 22b that detects that the end-of-discharge level has been recovered as a reset signal.

また、充電末検出手段１３は残量検出器９の出力信号を入力し、電力貯蔵部６の貯蔵された電力が充電末であることを検出する。充電末検出手段１３は残量検出器９の出力信号が充電末レベルであるか否かを判定するためのレベル検出器２２ｃ、２２ｄと、充電末レベルであることを検出するレベル検出器２２ｃの出力信号をセット信号とし、充電末レベルを回復したことを検出するレベル検出器２２ｄの出力信号をリセット信号とするフリップフロップ２３ｂとから構成される。   The end-of-charge detection means 13 receives the output signal of the remaining amount detector 9 and detects that the stored power in the power storage unit 6 is at the end of charge. The end-of-charge detection means 13 includes level detectors 22c and 22d for determining whether or not the output signal of the remaining amount detector 9 is at the end-of-charge level, and a level detector 22c for detecting the end-of-charge level. The output signal is a set signal, and a flip-flop 23b that uses the output signal of the level detector 22d that detects that the end-of-charge level has been recovered as a reset signal.

定数設定手段１４は、放電末検出手段１２の出力信号と充電末検出手段１３の出力信号に基づいて、補正値演算手段２４の不感帯１６の不感帯設定値及び乗算器１７の係数を設定するものである。   The constant setting unit 14 sets the dead zone set value of the dead zone 16 of the correction value calculation unit 24 and the coefficient of the multiplier 17 based on the output signal of the end of discharge detection unit 12 and the output signal of the end of charge detection unit 13. is there.

放電末対応手段２５は、放電末検出手段１２の出力信号に基づいて加算器１８ａの出力信号と０の出力信号とのいずれかを選択する選択回路１９ａと、系統出力基準値の増加側変化率に制限を加える増加側変化率制限手段２０と、増加側変化率制限手段２０の出力信号と加算器１８ａの出力信号の差分を演算する減算器１５ｂとから構成される。選択回路１９ａでは放電末レベルであるときに０の出力信号を選択する。   The discharge end handling unit 25 includes a selection circuit 19a that selects either the output signal of the adder 18a or the output signal of 0 based on the output signal of the discharge end detection unit 12, and the increasing rate of change of the system output reference value And an increase-side change rate limiting means 20 that limits the difference between the output signal of the increase-side change rate limiting means 20 and the output signal of the adder 18a. The selection circuit 19a selects an output signal of 0 when the discharge end level is reached.

充電末対応手段２６は、充電末検出手段１３の出力信号に基づいて加算器１８ａの出力信号と放電設定値Ｐｄｉｓとのいずれかを選択する選択回路１９ｂと、系統出力基準値の減少側変化率に制限を加える減少側変化率制限手段２１と、減少側変化率制限手段２１の出力信号と加算器１８ａの出力信号の差分を演算する減算器１５ｃとから構成される。選択回路１９ｂでは充電末レベルであるときに放電設定値Ｐｄｉｓの出力信号を選択する。   The end-of-charge handling means 26 includes a selection circuit 19b that selects either the output signal of the adder 18a or the discharge set value Pdis based on the output signal of the end-of-charge detection means 13, and a rate of change on the decrease side of the system output reference value. Decrease side change rate limiting means 21, and a subtractor 15c for calculating the difference between the output signal of the decrease side change rate limiting means 21 and the output signal of the adder 18a. The selection circuit 19b selects the output signal of the discharge set value Pdis when it is at the end-of-charge level.

加算器１８ｂは、加算器１８ａの出力信号と減算器１５ｂの出力信号及び減算器１５ｃの出力信号を合算し、加算器１８ｂの出力信号と電力検出器８ａの出力信号との差分を減算器１５ｄで演算し変換器制御装置７に出力する。   The adder 18b adds the output signal of the adder 18a, the output signal of the subtractor 15b, and the output signal of the subtractor 15c, and subtracts the difference between the output signal of the adder 18b and the output signal of the power detector 8a. And output to the converter controller 7.

次に、通常時の出力変動抑制装置３の動作を説明する。まず、補正値演算手段２４において、電力貯蔵部６の残量を表す残量検出器９の出力と残量基準値Ｒｒｅｆとの差分が定数設定手段１４によって設定された不感帯設定値の範囲内であれば不感帯１６の出力は０となる。これにより、乗算器１７の出力も０となり、補正値演算手段２４からの補正値は０となる。従って、移動平均演算手段１１の出力が加算器１８ａの出力となる。   Next, the operation of the normal output fluctuation suppressing device 3 will be described. First, in the correction value calculation unit 24, the difference between the output of the remaining amount detector 9 indicating the remaining amount of the power storage unit 6 and the remaining amount reference value Rref is within the range of the dead band set value set by the constant setting unit 14. If there is, the output of the dead zone 16 becomes zero. As a result, the output of the multiplier 17 is also zero, and the correction value from the correction value calculation means 24 is zero. Therefore, the output of the moving average calculation means 11 becomes the output of the adder 18a.

このとき、電力貯蔵部６の残量は放電末レベルＲｍｉｎに達しておらず、レベル検出器２２ａの出力は「０」となるので、フリップフロップ２３ａの出力、すなわち放電末検出手段１２の出力は「０」であり、増加側変化率制限手段２０には加算器１８ａの出力が入力される。また、電力貯蔵部６の残量は充電末レベルＲｍａｘに達しておらず、レベル検出器２２ｃの出力は「０」となるのでフリップフロップ２３ｂの出力、すなわち充電末検出手段１３の出力は「０」であり、減少側変化率制限手段２１にも加算器１８ａの出力が入力される。   At this time, the remaining amount of the power storage unit 6 has not reached the end-of-discharge level Rmin, and the output of the level detector 22a is “0”, so the output of the flip-flop 23a, that is, the output of the end-of-discharge detecting means 12 is It is “0” and the output of the adder 18 a is input to the increasing side change rate limiting means 20. Further, the remaining amount of the power storage unit 6 has not reached the end-of-charge level Rmax, and the output of the level detector 22c is “0”, so the output of the flip-flop 23b, that is, the output of the end-of-charge detecting means 13 is “0”. The output of the adder 18a is also input to the decrease side change rate limiting means 21.

増加側変化率制限手段２０の出力は入力信号が予め設定している変化率を増加側で上回るときにその変化率の単調増加となり、下回るときは入力信号と等しくなる。同様に、減少側変化率制限手段２１の出力は入力信号が予め設定している変化率を減少側で上回るときその変化率の単調減少となり、下回るときは入力信号と等しくなる。   The output of the increase-side change rate limiting means 20 is monotonically increasing when the input signal exceeds the preset change rate on the increase side, and is equal to the input signal when the input signal is below. Similarly, the output of the decrease-side change rate limiting means 21 is monotonically decreased when the input signal exceeds the preset change rate on the decrease side, and is equal to the input signal when the input signal is below.

移動平均演算手段１１では電力検出器８ａで検出された自然エネルギー発電装置２の有効電力出力値を増加側変化率制限手段２０及び減少側変化率制限手段２１に予め設定している変化率以下に鈍化させるので、増加側変化率制限手段２０及び減少側変化率制限手段２１の出力は加算器１８ａの出力と等しくなる。よって、増加側変化率制限手段２０の出力から加算器１８ａの出力を減じる減算器１５ｂ及び減少側変化率制限手段２１の出力から加算器１８ａの出力を減じる減算器１５ｃの出力は共に０となる。   In the moving average calculation means 11, the effective power output value of the natural energy power generation device 2 detected by the power detector 8 a is less than or equal to a change rate preset in the increase-side change rate limiting means 20 and the decrease-side change rate limiting means 21. Since the output is slowed down, the outputs of the increase-side change rate limiting means 20 and the decrease-side change rate limiting means 21 are equal to the outputs of the adder 18a. Accordingly, both the output of the subtractor 15b that subtracts the output of the adder 18a from the output of the increase side change rate limiting means 20 and the output of the subtractor 15c that subtracts the output of the adder 18a from the output of the decrease side change rate limiting means 21 are zero. .

その結果、加算器１８ｂの出力は加算器１８ａの出力と等しく、移動平均演算手段１１の出力と等しいことになる。加算器１８ｂの出力を商用系統へ出力する有効電力の基準値（系統出力基準値）とし、減算器１５ｄでは加算器１８ｂの出力から電力検出器８ａの出力を減じて電力変換器５の有効電力指令値とし、変換器制御装置７に入力され、有効電力指令値通りに電力変換器５の電力が制御されるので、商用系統への電力は移動平均演算手段１１の出力信号と等価になり、急峻な出力変動は抑制される。   As a result, the output of the adder 18b is equal to the output of the adder 18a and equal to the output of the moving average calculation means 11. The output of the adder 18b is used as a reference value (system output reference value) for the active power to be output to the commercial system, and the subtractor 15d subtracts the output of the power detector 8a from the output of the adder 18b to obtain the effective power of the power converter 5. The command value is input to the converter control device 7 and the power of the power converter 5 is controlled according to the active power command value. Therefore, the power to the commercial system is equivalent to the output signal of the moving average calculating means 11, Steep output fluctuations are suppressed.

次に、図２を用いて、充電末に達しないものの電力貯蔵部６の残量が多くなり、補正値演算手段２４により系統出力基準値が増加する場合の動作の一例を説明する。いま、時点ｔ１で自然エネルギー発電装置２の出力が急増したとすると、移動平均演算手段１１の出力は時間をかけて追従する特性となる。   Next, an example of the operation when the remaining power of the power storage unit 6 increases but the system output reference value is increased by the correction value calculation unit 24 will be described with reference to FIG. Now, assuming that the output of the natural energy power generation device 2 suddenly increases at the time t1, the output of the moving average calculation means 11 has a characteristic of following over time.

また、補正値演算手段２４の不感帯１６の出力は残量検出器９の出力と残量基準値Ｒｒｅｆとの差分に比例した正の数値となり、乗算器１７の出力は不感帯１６の出力と常に正の数値である定数設定手段１４の出力との積である正の数値となる。   The output of the dead zone 16 of the correction value calculation means 24 is a positive value proportional to the difference between the output of the remaining amount detector 9 and the remaining amount reference value Rref, and the output of the multiplier 17 is always positive with the output of the dead zone 16. It is a positive numerical value that is a product of the output of the constant setting means 14 that is a numerical value of.

加算器１８ａの出力は移動平均演算手段１１の出力と乗算器１７の出力との和であり、移動平均演算手段１１の出力より増加する。電力貯蔵部６は充電末及び放電末に達していないので放電末検出手段１２及び充電末検出手段１３の出力信号は「０」であり、選択回路１９ａ及び１９ｂの出力は加算器１８ａの出力となる。   The output of the adder 18a is the sum of the output of the moving average calculating means 11 and the output of the multiplier 17, and increases from the output of the moving average calculating means 11. Since the power storage unit 6 has not reached the end of charge or discharge, the output signals of the discharge end detection means 12 and the charge end detection means 13 are “0”, and the outputs of the selection circuits 19a and 19b are the outputs of the adder 18a. Become.

加算器１８ａの出力が増加なので減少側変化率制限手段２１の出力は加算器１８ａと等しくなり、減算器１５ｃの出力は０となる。加算器１８ａの出力が変化率設定値より低い場合は、増加側変化率制限手段２０の出力も加算器１８ａと等しくなり、減算器１５ｂの出力は０となる。その結果、系統出力基準値である加算器１８ｂの出力は加算器１８ａと等しく、移動平均演算手段１１の出力より大きいものとなる。系統出力が増加することで時点ｔ２から電力変換器５による充電量の減少が加速し、時点ｔ３からは放電となって電力貯蔵部６の残量が残量基準値Ｒｒｅｆに近づくように作用する。   Since the output of the adder 18a is increased, the output of the decrease side change rate limiting means 21 is equal to that of the adder 18a, and the output of the subtractor 15c is 0. When the output of the adder 18a is lower than the change rate set value, the output of the increasing side change rate limiting means 20 is also equal to the adder 18a, and the output of the subtractor 15b is 0. As a result, the output of the adder 18b, which is the system output reference value, is equal to that of the adder 18a and is larger than the output of the moving average calculation means 11. The increase in the system output accelerates the decrease in the amount of charge by the power converter 5 from time t2, and discharges from time t3 to act so that the remaining amount of the power storage unit 6 approaches the remaining amount reference value Rref. .

なお、加算器１８ａの出力の変化率が変化率設定値より高い場合は、増加側変化率制限手段２０の出力が加算器１８ａよりも低値の変化率設定値による単調増加となるので、減算器１５ｂの出力は変化率の超過分に応じた負の数値となる。その結果、加算器１８ｂの出力は変化率設定値を超過しない系統出力基準値となるので、商用系統１への出力電力を一定の変化率に抑えるように作用する。   When the change rate of the output of the adder 18a is higher than the change rate set value, the output of the increase-side change rate limiting means 20 is monotonically increased due to a lower change rate set value than the adder 18a. The output of the device 15b is a negative value corresponding to the excess of the change rate. As a result, the output of the adder 18b becomes a system output reference value that does not exceed the change rate set value, and thus acts to suppress the output power to the commercial system 1 to a constant change rate.

次に、図３を用いて、放電末に達しないものの電力貯蔵部６の残量が少なくなり、補正値演算手段２４により系統出力基準値が減少する場合の動作の一例を説明する。自然エネルギー発電装置２の出力が時点ｔ１で急減したとすると、移動平均演算手段１１の出力は時間をかけて追従する特性となる。   Next, an example of the operation when the remaining power of the power storage unit 6 is reduced but the system output reference value is decreased by the correction value calculation means 24 will be described with reference to FIG. Assuming that the output of the natural energy power generation device 2 suddenly decreases at the time point t1, the output of the moving average calculation means 11 has a characteristic of following over time.

また、補正値演算手段２４の不感帯１６の出力は残量検出器９の出力と残量基準値Ｒｒｅｆとの差分に比例した負の数値となり、乗算器１７の出力は不感帯１６の出力と常に正の数値である定数設定手段１４の出力との積である負の数値となる。   The output of the dead zone 16 of the correction value calculation means 24 is a negative value proportional to the difference between the output of the remaining amount detector 9 and the remaining amount reference value Rref, and the output of the multiplier 17 is always positive with the output of the dead zone 16. This is a negative numerical value that is a product of the output of the constant setting means 14 that is a numerical value of.

加算器１８ａの出力は移動平均演算手段１１と乗算器１７の和であり、移動平均演算手段１１の出力より小さくなる。充電末及び放電末に達していないので放電末検出手段１２及び充電末検出手段１３の出力信号は「０」であり、選択回路１９ａ及び１９ｂの出力は加算器１８ａの出力となる。加算器１８ａの出力が減少なので増加側変化率制限手段２０の出力は加算器１８ａと等しくなり、減算器１５ｃの出力は０となる。加算器１８ａの出力が変化率設定値より低い場合は、減少側変化率制限手段２１の出力も加算器１８ａと等しくなり、減算器１５ｂの出力は０となる。その結果、系統出力基準値である加算器１８ｂの出力は加算器１８ａと等しく、移動平均演算手段１１の出力より小さいものとなる。系統出力が減少することで時点ｔ２から電力変換器５による放電の減少が加速し、時点ｔ３からは充電となって電力貯蔵部６の残量が残量基準値Ｒｒｅｆに近づくように作用する。   The output of the adder 18a is the sum of the moving average calculation means 11 and the multiplier 17, and is smaller than the output of the moving average calculation means 11. Since the end of charge and the end of discharge have not been reached, the output signals of the discharge end detection means 12 and the end of charge detection means 13 are “0”, and the outputs of the selection circuits 19a and 19b become the output of the adder 18a. Since the output of the adder 18a is decreased, the output of the increasing side change rate limiting means 20 is equal to that of the adder 18a, and the output of the subtractor 15c is 0. When the output of the adder 18a is lower than the change rate set value, the output of the decreasing side change rate limiting means 21 is also equal to the adder 18a, and the output of the subtractor 15b is 0. As a result, the output of the adder 18b, which is the system output reference value, is equal to that of the adder 18a and is smaller than the output of the moving average calculation means 11. As the system output decreases, the decrease in discharge by the power converter 5 is accelerated from time t2, and charging starts from time t3 so that the remaining amount of the power storage unit 6 approaches the remaining amount reference value Rref.

なお、加算器１８ａの出力の変化率が変化率設定値より高い場合は、減少側変化率制限手段２１の出力が加算器１８ａよりも低値の変化率設定値による単調減少となるので、減算器１５ｃの出力は変化率の超過分に応じた正の数値となる。その結果、加算器１８ｂの出力は変化率設定値を超過しない系統出力基準値となるので、系統への出力電力を一定の変化率に抑えるように作用する。   When the change rate of the output of the adder 18a is higher than the change rate set value, the output of the decrease side change rate limiting means 21 is monotonously decreased due to the change rate set value lower than that of the adder 18a. The output of the device 15c is a positive value corresponding to the excess of the change rate. As a result, the output of the adder 18b becomes a grid output reference value that does not exceed the change rate set value, and thus acts to suppress the output power to the grid at a constant rate of change.

次に、図４を用いて、充電末に達した場合の動作の一例を説明する。いま、時点ｔ１で自然エネルギー発電装置２の出力が急増したとすると、移動平均演算手段１１の出力は時間をかけて追従する特性となる。また、電力貯蔵部６の残量が増加していくと、時点ｔ２で不感帯を超過して不感帯１６の出力が正の値となり、不感帯１６の出力に定数設定手段１４の出力を乗じた分だけ加算器１８ａ、１８ｂの出力（系統出力基準値）は移動平均演算手段１１の出力より増加する。   Next, an example of the operation when the end of charging is reached will be described with reference to FIG. Now, assuming that the output of the natural energy power generation device 2 suddenly increases at the time t1, the output of the moving average calculation means 11 has a characteristic of following over time. Further, when the remaining amount of the power storage unit 6 increases, the dead zone is exceeded at time t2, the output of the dead zone 16 becomes a positive value, and the output of the dead zone 16 is multiplied by the output of the constant setting means 14. The outputs (system output reference values) of the adders 18 a and 18 b are increased from the output of the moving average calculation means 11.

その増加分が足りなければ時点ｔ２以降も自然エネルギー発電装置２の出力が系統出力より大きい状態、すなわち充電状態が継続するため電力貯蔵部の残量は増加し時点ｔ３で充電末に達する。充電末に達して充電末検出手段１３の出力が「１」になると、選択回路１９ｂによって減少側変化率制限手段２１の入力が加算器１８ａの出力から放電設定値Ｐｄｉｓに切り替わる。放電設定値Ｐｄｉｓは自然エネルギー発電装置２の定格出力に１．０を超える係数（例えば１．２）を乗じたものであり、選択回路１９ｂの切り替わりによって減少側変化率制限手段２１の出力は瞬時に放電設定値Ｐｄｉｓとなる。   If the increase is not sufficient, the state of the output of the natural energy power generation device 2 is greater than the system output after time t2, that is, the state of charge continues, so the remaining amount of the power storage unit increases and reaches the end of charging at time t3. When the end of charge is reached and the output of the end of charge detecting means 13 becomes “1”, the input of the decreasing side change rate limiting means 21 is switched from the output of the adder 18a to the discharge set value Pdis by the selection circuit 19b. The discharge set value Pdis is obtained by multiplying the rated output of the natural energy power generation device 2 by a coefficient exceeding 1.0 (for example, 1.2), and the output of the decrease-side change rate limiting means 21 is instantaneous when the selection circuit 19b is switched. Becomes the discharge set value Pdis.

このとき、減算器１５ｂの出力は０なので、加算器１８ｂの出力は減少側変化率制限手段２１の出力となる（加算器１８ｂの出力＝加算器１８ａの出力＋減少側変化率制限手段２１の出力−加算器１８ａの出力）。系統出力基準値である加算器１８ｂの出力は時点ｔ３で急増し、系統出力基準値が自然エネルギー発電装置２の出力を超過する放電状態となるので電力貯蔵部６の残量は減少に転じる。   At this time, since the output of the subtractor 15b is 0, the output of the adder 18b becomes the output of the decreasing side change rate limiting means 21 (output of the adder 18b = output of the adder 18a + decreasing side change rate limiting means 21). Output-output of adder 18a). The output of the adder 18b, which is the grid output reference value, rapidly increases at time t3, and the grid output reference value is in a discharge state exceeding the output of the natural energy power generation device 2, so the remaining amount of the power storage unit 6 starts to decrease.

そして、電力貯蔵部６の残量が復帰基準Ｒｍｉｄ（例えば、充放電量の中間点）に達する時点ｔ４では充電末検出手段１３がリセットされて出力が「０」となり、選択回路１９ｂの出力が加算器１８ａの出力に切り替わる。減少側変化率制限手段２１の出力は変化率設定値に応じて単調減少し、加算器１８ａの出力と等しくなる時点ｔ５以降は充放電末に達しない場合と同様の作用となる。   Then, at the time t4 when the remaining amount of the power storage unit 6 reaches the return reference Rmid (for example, the middle point of the charge / discharge amount), the charge end detection means 13 is reset and the output becomes “0”, and the output of the selection circuit 19b is The output is switched to the output of the adder 18a. The output of the decrease-side change rate limiting means 21 monotonously decreases in accordance with the change rate set value, and has the same effect as when the charge / discharge end is not reached after time t5 when it becomes equal to the output of the adder 18a.

次に、図５を用いて、放電末に達した場合の動作の一例を説明する。自然エネルギー発電装置２の出力が時点ｔ１で急減したとすると、移動平均演算手段１１の出力は時間をかけて追従する特性となる。これにより、電力貯蔵部６の残量が減少していくと、時点ｔ２で不感帯を超過して不感帯１６の出力が負の値となり、不感帯１６の出力に定数設定手段１４の出力を乗じた分だけ加算器１８ａ、１８ｂの出力（系統出力基準値）は移動平均演算手段１１の出力より減少する。   Next, an example of the operation when the end of discharge is reached will be described with reference to FIG. Assuming that the output of the natural energy power generation device 2 suddenly decreases at the time point t1, the output of the moving average calculation means 11 has a characteristic of following over time. As a result, when the remaining amount of the power storage unit 6 decreases, the dead zone is exceeded at time t2 and the output of the dead zone 16 becomes a negative value, and the output of the dead zone 16 is multiplied by the output of the constant setting means 14. Therefore, the outputs (system output reference values) of the adders 18a and 18b are smaller than the output of the moving average calculating means 11.

その減少分が足りなければ時点ｔ２以降も自然エネルギー発電装置２の出力が系統出力より小さい状態、すなわち放電状態が継続するため電力貯蔵部６の残量は減少し、時点ｔ３で放電末に達する。放電末に達して放電末検出手段１２の出力が「１」になると、選択回路１９ａによって増加側変化率制限手段２０の入力が加算器１８ａの出力から０に切り替わり、増加側変化率制限手段２０の出力は瞬時に０となる。このとき、減算器１５ｃの出力は０なので、加算器１８ｂの出力は増加側変化率制限手段２０の出力となる（加算器１８ｂの出力＝加算器１８ａの出力＋増加側変化率制限手段２０の出力−加算器１８ａの出力）。系統出力基準値である加算器１８ｂの出力は時点ｔ３で急減し、系統出力基準値が自然エネルギー発電装置２の出力を下回る充電状態となるので電力貯蔵部６の残量は増加に転じる。   If the decrease is not enough, the output of the natural energy power generation device 2 is smaller than the system output after time t2, that is, the discharge state continues, so the remaining amount of the power storage unit 6 decreases and reaches the end of discharge at time t3. . When the end of discharge is reached and the output of the discharge end detection means 12 becomes “1”, the input of the increase side change rate limiting means 20 is switched from the output of the adder 18a to 0 by the selection circuit 19a, and the increase side change rate limiting means 20 The output immediately becomes zero. At this time, since the output of the subtracter 15c is 0, the output of the adder 18b becomes the output of the increasing side change rate limiting means 20 (output of the adder 18b = output of the adder 18a + increasing change rate limiting means 20). Output-output of adder 18a). The output of the adder 18b, which is the grid output reference value, suddenly decreases at time t3, and the grid output reference value is in a charging state that is lower than the output of the natural energy power generation device 2, so the remaining amount of the power storage unit 6 starts to increase.

そして、電力貯蔵部６の残量が復帰基準Ｒｍｉｄ（例えば、充放電量の中間点）に達する時点ｔ４では放電末検出手段１２がリセットされて出力が「０」となり、選択回路１９ａの出力が加算器１８ａの出力に切り替わる。増加側変化率制限手段２０の出力は変化率設定値に応じて単調増加し、加算器１８ａの出力と等しくなる時点ｔ５以降は充放電末に達しない場合と同様の作用となる。   At the time t4 when the remaining amount of the power storage unit 6 reaches the return reference Rmid (for example, the middle point of the charge / discharge amount), the discharge end detection means 12 is reset and the output becomes “0”, and the output of the selection circuit 19a is The output is switched to the output of the adder 18a. The output of the increase-side change rate limiting means 20 monotonously increases in accordance with the change rate set value, and has the same effect as when the charge / discharge end is not reached after time t5 when it becomes equal to the output of the adder 18a.

次に、定数設定手段１４の動作を説明する。定数設定手段１４には予め不感帯１６の初期設定値と乗算器１７に対する係数の初期値、及び不感帯設定値の変更幅と乗算器１７に対する係数の変更幅、係数の最大値が設定される。初期設定値を用いて制御する過程において、放電末検出手段１２または充電末検出手段１３の出力のいずれかが「１」になる度に定数設定手段１４は乗算器１７に対する係数を変更幅分だけ増加させていく。   Next, the operation of the constant setting unit 14 will be described. In the constant setting means 14, an initial setting value of the dead zone 16 and an initial value of the coefficient for the multiplier 17, a change range of the dead zone setting value, a change range of the coefficient for the multiplier 17, and a maximum value of the coefficient are set. In the process of controlling using the initial setting value, the constant setting unit 14 sets the coefficient for the multiplier 17 by the amount of change every time one of the outputs of the discharge end detection unit 12 or the charge end detection unit 13 becomes “1”. Increase it.

そして、係数の最大値に達したら、不感帯設定値を変更幅分だけ減少させた上で乗算器１７に対する係数を初期値に戻す。以上により、充放電末に達する度に乗算器１７に対する係数が増加するので、電力貯蔵部６の残量に応じた系統出力基準値の補正量が増加するとともに、係数が最大値に達した場合には不感帯設定値を減少させることでさらに補正量が増加するので、電力貯蔵部６の残量が充放電末に達しにくくなるように作用する。   When the maximum value of the coefficient is reached, the dead band set value is decreased by the change width, and the coefficient for the multiplier 17 is returned to the initial value. As described above, the coefficient for the multiplier 17 increases every time the end of charge / discharge is reached, so that the correction amount of the system output reference value corresponding to the remaining amount of the power storage unit 6 increases and the coefficient reaches the maximum value Since the correction amount is further increased by decreasing the dead zone setting value, the remaining amount of the power storage unit 6 is less likely to reach the end of charge / discharge.

本発明の実施の形態によれば、移動平均演算手段１１の出力を系統出力基準値として、過不足を電力変換器５で充放電することにより自然エネルギー発電装置２の出力変動を抑制できるとともに、電力貯蔵部６の残量に応じて系統出力基準値を補正することで残量が多くなると放電となるように、残量が少なくなると充電となるように動作するので、充放電末に達して制御不能となる頻度を減少させることができる。   According to the embodiment of the present invention, the output fluctuation of the natural energy power generation device 2 can be suppressed by charging / discharging the excess or deficiency with the power converter 5 using the output of the moving average calculation means 11 as the system output reference value, By correcting the grid output reference value according to the remaining amount of the power storage unit 6, it operates so as to be discharged when the remaining amount is increased, and to be charged when the remaining amount is decreased. It is possible to reduce the frequency of being out of control.

また、充電末に達した場合には放電に、放電末に達した場合には充電に切り替わる系統出力基準値とすることにより、充放電末から回復することができる。さらに、充放電末に達する度に定数設定手段１４で系統出力基準値の補正に関わる不感帯設定値と係数を変更させることにより、充放電末に達しにくい制御定数に自動的に調整することができる。   Moreover, it can recover | recover from the end of charging / discharging by setting it as the system | strain output reference value which switches to charge when it reaches the end of charge, and switches to charge when it reaches the end of discharge. Furthermore, by changing the dead zone setting value and coefficient related to the correction of the system output reference value by the constant setting means 14 every time the charge / discharge end is reached, it is possible to automatically adjust to a control constant that does not easily reach the end of charge / discharge. .

本発明の実施の形態に係わる自然エネルギー発電装置の出力変動抑制装置の構成図。The block diagram of the output fluctuation suppression apparatus of the natural energy power generation apparatus concerning embodiment of this invention. 本発明の実施の形態における補正値演算手段により系統出力基準値が増加する場合の動作の一例を示す信号波形図。The signal waveform diagram which shows an example of operation | movement in case a system | strain output reference value increases by the correction value calculating means in embodiment of this invention. 本発明の実施の形態における補正値演算手段により系統出力基準値が減少する場合の動作の一例を示す信号波形図。The signal waveform diagram which shows an example of operation | movement in case a system | strain output reference value reduces by the correction value calculating means in embodiment of this invention. 本発明の実施の形態における電力貯蔵部が充電末に達した場合の動作の一例を示す信号波形図。The signal waveform diagram which shows an example of operation | movement when the electric power storage part in embodiment of this invention has reached the end of charge. 本発明の実施の形態における電力貯蔵部が放電末に達した場合の動作の一例を示す信号波形図。The signal waveform diagram which shows an example of operation | movement when the electric power storage part in embodiment of this invention reaches the end of discharge. 従来の出力変動抑制装置の構成図。The block diagram of the conventional output fluctuation suppression apparatus. 自然エネルギー発電装置の出力が急減したときの従来の出力変動抑制装置の信号波形図。The signal waveform diagram of the conventional output fluctuation suppression apparatus when the output of a natural energy power generation device falls rapidly. 自然エネルギー発電装置の出力が急増したときの従来の出力変動抑制装置の信号波形図。The signal waveform diagram of the conventional output fluctuation suppression apparatus when the output of a natural energy power generation device increases rapidly.

符号の説明Explanation of symbols

１…商用系統、２…自然エネルギー発電装置、３…出力変動抑制装置、４…変動抑制制御装置、５…電力変換器、６…電力貯蔵部、７…変換器制御装置、８…電力検出器、９…残量検出手段、１１…移動平均演算手段、１２…放電末検出手段、１３…充電末検出手段、１４…定数設定手段、１５…減算器、１６…不感帯、１７…乗算器、１８…加算器、１９…選択回路、２０…増加側変化率制限手段、２１…減少側変化率制限手段、２２…レベル検出器、２３…フリップフロップ、２４…補正値演算手段、２５…放電末対応手段、２６…、充電末対応手段 DESCRIPTION OF SYMBOLS 1 ... Commercial system, 2 ... Natural energy power generation device, 3 ... Output fluctuation suppression apparatus, 4 ... Fluctuation suppression control apparatus, 5 ... Power converter, 6 ... Electric power storage part, 7 ... Converter control apparatus, 8 ... Electric power detector , 9 ... Remaining amount detection means, 11 ... Moving average calculation means, 12 ... Discharge end detection means, 13 ... End of charge detection means, 14 ... Constant setting means, 15 ... Subtractor, 16 ... Dead band, 17 ... Multiplier, 18 DESCRIPTION OF SYMBOLS ... Adder, 19 ... Selection circuit, 20 ... Increase side change rate limiting means, 21 ... Decrease side change rate limiting means, 22 ... Level detector, 23 ... Flip-flop, 24 ... Correction value calculation means, 25 ... Corresponding to discharge end Means, 26...

Claims (2)

電力を貯蔵するための電力貯蔵部の電力を放電または充電する電力変換器と、自然エネルギー発電装置の出力変動値を平滑化して系統出力基準値とする移動平均演算手段と、前記電力貯蔵部のエネルギー残量と残量基準との差分から系統出力基準値の補正量を算出し系統出力基準値に補正を加える補正値演算手段と、前記電力貯蔵部のエネルギー残量から放電末を検出する放電末検出手段と、前記放電末検出手段で放電末が検出された場合に前記補正値演算手段で算出された補正量に基づき系統出力基準値を増加させる放電末対応手段と、前記充電末検出手段で充電末が検出された場合に前記補正値演算手段で算出された補正量に基づき系統出力基準値を減少させる充電末対応手段と、前記系統出力基準値と自然エネルギー発電装置の出力の差分を指令値として前記電力変換器の出力を制御する変換器制御装置とを備えたことを特徴とする自然エネルギー発電装置の出力変動抑制装置。 A power converter that discharges or charges the power of the power storage unit for storing power, a moving average calculation means that smoothes the output fluctuation value of the natural energy power generation device and sets it as a system output reference value, and the power storage unit A correction value calculating means for calculating a correction amount of the system output reference value from the difference between the remaining energy level and the remaining capacity reference and correcting the system output reference value, and discharge for detecting the end of discharge from the remaining energy of the power storage unit End detection means , discharge end corresponding means for increasing a system output reference value based on the correction amount calculated by the correction value calculation means when the discharge end is detected by the discharge end detection means, and the end of charge detection means a charging end corresponding means for reducing the correction value system output reference value based on the calculated correction amount calculating means when the charging end is detected in, the output of the line output reference value and the natural energy power generation device Min the output fluctuation suppressing device of natural energy power generation device being characterized in that a converter controller for controlling the output of the power converter as a command value. 前記放電末検出手段で放電末が検出された場合、または充電末検出手段で充電末が検出された場合に、前記補正値演算手段で計算される補正値が増加するように計算に用いる定数を変更する定数設定手段を備えたことを特徴とする請求項１に記載の自然エネルギー発電装置の出力変動抑制装置。   When a discharge end is detected by the discharge end detection means, or when a charge end is detected by the charge end detection means, a constant used for calculation so that the correction value calculated by the correction value calculation means increases. The output fluctuation suppressing device for a natural energy power generator according to claim 1, further comprising constant setting means for changing.
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