WO2007099767A1 - Nouveau dispositif de limitation de fluctuation de production de systeme de generation d'energie - Google Patents

Nouveau dispositif de limitation de fluctuation de production de systeme de generation d'energie 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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WO
WIPO (PCT)
Prior art keywords
power
power generation
unit
value
change rate
Prior art date
Application number
PCT/JP2007/052599
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English (en)
Japanese (ja)
Inventor
Keiji Takahara
Satoru Nakamura
Yusuke Kuniba
Hiromichi Matsuda
Masaru Miyagi
Naoto Higa
Katsuhiro Shinzen
Yasuo Kataoka
Masakatsu Nomura
Original Assignee
Meidensha Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Meidensha Corporation filed Critical Meidensha Corporation
Priority to CN200780006394XA priority Critical patent/CN101438476B/zh
Publication of WO2007099767A1 publication Critical patent/WO2007099767A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices

Definitions

  • 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.
  • Patent Document 1 is known as a power generation system.
  • 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.
  • 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.
  • 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.
  • 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.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2001-5543, which is a published patent of Japan
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2000-4541, which is a published patent of Japan
  • 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.
  • 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.
  • 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.
  • 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
  • the power storage unit is interposed between the power system and the power generation unit.
  • 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.
  • 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.
  • 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.
  • 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,
  • 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.
  • 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.
  • the power generation facility is a small hydraulic power generation facility, a diesel power generation facility, or a gas engine power generation facility.
  • FIG. 1 is a block diagram showing a first embodiment of the present invention.
  • FIG. 2 The block diagram of a change rate calculating part.
  • FIG. 3 An operation flowchart of the change rate calculation unit.
  • 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.
  • FIG. 5 The block diagram which shows the 2nd Embodiment of this invention.
  • FIG. 6 is a block diagram showing a third embodiment of the present invention.
  • FIG. 7 is a block diagram showing a fourth embodiment of the present invention.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • 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.
  • 14 is a sampling signal output at a predetermined time interval
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 3 shows an operation flow of the change rate control unit 20.
  • 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.
  • step S2 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). .
  • step S2 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the power fluctuation to the load connected to this power system can be alleviated.
  • 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.
  • the output of the power system is stable even in such a case, and the effect of the power fluctuation mitigation control becomes remarkable.
  • FIG. 7 shows an embodiment in the case where a power system is linked to the embodiment of FIG. 1 or FIG.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • 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.
  • 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.
  • 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.
  • the power generation unit 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.

Abstract

La présente invention concerne l'alimentation électrique produite par un générateur qui convertit une énergie naturelle en énergie électrique et qui présente le problème d'être grandement affectée par les conditions météorologiques, ce qui fait que le générateur d'une installation de production ne peut pas suivre la fluctuation d'alimentation générée. Pour résoudre le problème, l'alimentation électrique produite par le générateur est détectée et acheminée dans une unité de calcul de rapport de variation. Cette unité est accompagnée d'une valeur de configuration de rapport de variation de sens positif et une de sens négatif qui sont configurées pour limiter les valeurs comme montants de variation inférieurs au montant de variation d'alimentation le plus grand qui peut être suivi par un gouverneur du générateur de l'installation de production. L'unité de calcul de rapport de variation calcule une valeur d'instruction de charge/décharge selon chaque signal reçu.
PCT/JP2007/052599 2006-02-24 2007-02-14 Nouveau dispositif de limitation de fluctuation de production de systeme de generation d'energie WO2007099767A1 (fr)

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CN200780006394XA CN101438476B (zh) 2006-02-24 2007-02-14 新的能量发电系统输出起伏缓和装置

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JP2006-047648 2006-02-24
JP2006047648A JP5354840B2 (ja) 2006-02-24 2006-02-24 新エネルギー発電システム出力変動緩和装置

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WO2011122681A1 (fr) * 2010-03-30 2011-10-06 三洋電機株式会社 Système de stabilisation de systèmes, système d'alimentation, procédé pour commander un dispositif de gestion central, et programme pour dispositif de gestion central

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WO2011122681A1 (fr) * 2010-03-30 2011-10-06 三洋電機株式会社 Système de stabilisation de systèmes, système d'alimentation, procédé pour commander un dispositif de gestion central, et programme pour dispositif de gestion central

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CN101438476B (zh) 2012-04-11
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