JP6407730B2 - Generation power smoothing system - Google Patents

Generation power smoothing system Download PDF

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JP6407730B2
JP6407730B2 JP2015001545A JP2015001545A JP6407730B2 JP 6407730 B2 JP6407730 B2 JP 6407730B2 JP 2015001545 A JP2015001545 A JP 2015001545A JP 2015001545 A JP2015001545 A JP 2015001545A JP 6407730 B2 JP6407730 B2 JP 6407730B2
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power
steam
generated
generated power
flow path
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JP2016127755A (en
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松隈 正樹
正樹 松隈
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株式会社神戸製鋼所
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/46Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
    • Y02E10/723
    • Y02E10/763
    • Y02P80/21

Description

  The present invention relates to a generated power smoothing system.

  In power generation using solar energy such as solar power generation and solar thermal power generation, the power generation output greatly fluctuates due to the influence of the day's sunshine. For example, power generation cannot be performed at night, and power generation output greatly decreases on rainy or cloudy days. In addition, in the case of sunshine conditions from dawn to sunset, which are examples of relatively long-period fluctuations (hereinafter sometimes referred to as long-period fluctuations) that occur over several hours, The power generation output fluctuates greatly during the day. Furthermore, solar cells that are examples of relatively short-cycle fluctuations (hereinafter sometimes referred to as short-cycle fluctuations) that occur within a period of, for example, 20 minutes from a few seconds so that the solar cells enter and leave the shadow of a cloud. Even in this case, the power generation output fluctuates significantly in a short time.

  In Japan, the power transmission system (transmission line) is weaker in remote areas and remote islands near the end of the transmission system. Connecting the transmission line with the power generation output that fluctuates as described above to the transmission system close to the end may not be permitted by the power company because the transmission system becomes unstable.

  Patent Document 1 discloses a power generation facility including a solar power generation device having a solar receiver and a solar thermal power generation device having a solar heat receiver as a system that uses solar energy to stably supply electric power.

  In this facility, the solar power generation time is generated by the solar power generation apparatus using the solar energy concentrated on the solar receiver, and the heat medium is heated by the solar energy concentrated on the solar heat receiver. The heat is stored in the heat storage device. In the time zone when sunlight is weak, the heat medium is heated by the heat of the heat storage device to generate steam, and the steam is used to generate power by the solar power generator.

  Therefore, the heat storage device must be switched to a heat storage state during a time zone when sunlight is strong, and switched to a state where the stored heat is used during a time zone when sunlight is weak.

  However, in the above equipment, it is difficult to switch and use the heat storage device in a relatively short time. Moreover, in patent document 1, the countermeasure with respect to short period fluctuation | variation accompanying the change of the weather of solar energy etc. is not mentioned in particular.

JP 2013-105927 A

  An object of the present invention is to smooth the generated power that changes in a short period by power generation using sunlight or wind power.

As means for solving the above-mentioned problems, the generated power smoothing system according to the present invention includes a renewable energy power generation apparatus that generates first generated power by sunlight or wind power, and steam generation means for generating steam. A steam generator that drives a positive displacement rotary machine with the steam supplied from the steam generation means via a steam supply flow path to generate second generated power; the first generated power and the second A first power integration means capable of integrating the generated power; a power transducer for detecting the first generated power of the renewable energy-use power generation apparatus; the first generated power detected by the power transducer; The magnitude of the second generated power is controlled based on the magnitude of the first generated power so that the sum with the second generated power becomes a preset set generated power. And a control device, said control device, based on the first average value calculated by the plurality of detection values from said power transducer which is detected by the first interval set in advance, the rotational speed of the steam generator The set power generation based on a first control unit to be controlled and a second average value calculated from a plurality of detected values from the power transducer detected at a second interval preset in a longer interval than the first interval A second control unit for resetting the power .

According to this configuration, the magnitude of the second generated power generated by the steam generator so as to be a preset set generated power based on the magnitude of the first generated power generated by sunlight or wind power. Therefore, the set generated power can be generated stably. Therefore, it is possible to smooth the generated power that changes in a short period by power generation using sunlight or wind power. In addition, the rotation speed of the steam generator can be controlled based on the first average value every time a relatively short time set in advance elapses. As a result, the set power generation can be generated stably in the short term in accordance with the actual power generation state in the power generator using renewable energy. Moreover, every time a relatively long time set in advance elapses, the set generated power can be reset based on the second average value. As a result, the set power generation can be generated stably over a long period of time in accordance with the actual power generation state in the power generator using renewable energy.

As means for solving the above-mentioned problems, the generated power smoothing system according to the present invention includes a renewable energy power generation apparatus that generates first generated power by sunlight or wind power, and steam generation means for generating steam. A steam generator that drives a positive displacement rotary machine with the steam supplied from the steam generation means via a steam supply flow path to generate second generated power; the first generated power and the second A first power integration means capable of integrating the generated power; a power transducer for detecting the first generated power of the renewable energy-use power generation apparatus; the first generated power detected by the power transducer; The magnitude of the second generated power is controlled based on the magnitude of the first generated power so that the sum with the second generated power becomes a preset set generated power. Heat exchange is possible between the control device and the primary side flow path through which the first heat medium, which is the steam in the steam supply flow path downstream from the steam generator, and the secondary side flow path through which the working medium flows. And a second power integration unit capable of integrating the power integrated by the first power integration unit and the third power generated by the binary power generation unit. I did it.

  A binary power generation device having an evaporator in which a primary flow path through which the first heat medium flows and a secondary flow path through which the working medium flows are configured to be capable of exchanging heat; It is preferable that the first heat medium is steam in the steam supply channel downstream of the steam generator. According to this configuration, it is possible to recover the steam energy that is not used by the steam generator with the binary power generator, and to improve the energy efficiency.

  A bypass having one end connected to the steam supply channel between the steam generating means and the steam generator and the other end connected to the steam supply channel between the steam generator and the binary power generator It is preferable to provide a flow path. According to this configuration, surplus steam energy can be directly recovered by the binary power generation device by circulating the surplus steam excluding the steam used in the steam generator among the steam from the steam generating means through the bypass passage. And energy efficiency can be improved.

  Preferably, at least one of the steam supply channel and the bypass channel is provided with an on-off valve that can be switched so that the steam from the steam generating means is circulated. According to this configuration, it is possible to effectively generate power by controlling the opening of the on-off valve.

  It is preferable to have a second power integration unit capable of integrating the power integrated by the first power integration unit and the third generated power generated by the binary power generator. According to this configuration, the total amount of generated power can be increased while smoothing.

  The primary channel has the steam supply channel and a reflux channel, and one end of the reflux channel is connected to the steam supply channel via an evaporator of the binary power generation device. The other end is connected to the steam generating means, and the reflux flow path preferably includes a pump for refluxing the first heat medium condensed by the evaporator of the binary power generation apparatus to the steam generating means. According to this configuration, the first heat medium condensed by the evaporator of the binary power generator is recirculated to the steam generation means by the pump, so that the heat energy of the first heat medium can be used by the steam generation means.

  It is preferable to include a heat exchanger provided in the return flow path upstream of the pump to exchange heat between the first heat medium and the second heat medium in the return flow path. According to this configuration, part of the heat energy of the first heat medium that is circulated to the steam generating means can be transmitted to the second heat medium via the heat exchanger, and the second heat medium can be obtained at a relatively low cost. The medium can be heated.

  The steam generating means preferably generates the steam using at least one of biomass fuel, geothermal heat, or solar heat. According to this configuration, steam can be generated using unused energy.

  The steam generating means is preferably a biomass boiler that uses woody biomass fuel. According to this structure, the woody biomass fuel which is not a dangerous substance can be used as a fuel of a steam generation means, and fuel management can be easily performed.

  According to the present invention, the magnitude of the second generated power generated by the steam generator so as to be a preset set generated power based on the magnitude of the first generated power generated by sunlight or wind power. Therefore, the set generated power can be generated stably. Therefore, it is possible to smooth the generated power that changes in a short period by power generation using sunlight or wind power.

Schematic which shows the smoothing system of the generated electric power of this invention. Schematic which shows a binary power generator.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a schematic diagram of a generated power smoothing system according to the present invention. The generated power smoothing system 10 includes a steam generator 11, a steam generator 12, steam binary power generators 13 </ b> A and 13 </ b> B, a renewable energy utilizing power generator 14, and a controller 15.

  The steam generating means of this embodiment is a woody biomass boiler 11. The woody biomass boiler 11 generates a certain amount of steam per unit time using woody biomass fuel.

  The steam generator 12 is disposed in a steam supply flow path 16 downstream of the woody biomass boiler 11. The steam generator 12 includes a positive displacement rotary machine 17 and a generator main body 18. The positive displacement rotary machine of this embodiment is a screw turbine. The screw turbine 17 is driven by steam (first heat medium) from the woody biomass boiler 11 supplied via the steam supply flow path 16. The generator body 18 is connected to the rotating shaft 19 of the screw turbine 17 and generates electric power (second generated electric power) by the driving force of the screw turbine 17. The generator body 18 is provided with a power transmission line 20 for transmitting the second generated power, and the power transmission line 20 is electrically connected to a first power integration panel (first power integration means) 50 described later. ing.

  The steam supply channel 16 is a channel for supplying steam from the woody biomass boiler 11. The steam supply channel 16 has an upstream steam supply channel 16A and a downstream steam supply channel 16B on the upstream side and the downstream side of the steam generator 12. One end of the upstream steam supply channel 16 </ b> A is connected to the woody biomass boiler 11, and the other end is connected to the steam inlet 17 a of the steam generator 12. The upstream end of the downstream steam supply channel 16 </ b> B is connected to the steam outlet 17 b of the steam generator 12. The downstream steam supply channel 16B has two branch channels (first branch channels) 21A and 21B on the downstream side, and the downstream ends of the first branch channels 21A and 21B are respectively shown in FIG. Are connected to the steam inlets 23A and 23B of the evaporators 22A and 22B of the steam binary power generation devices 13A and 13B.

  The generated power smoothing system 10 is provided with two steam binary power generation devices 13 </ b> A and 13 </ b> B arranged in parallel to the steam generator 12. As shown in FIG. 2, each of the steam binary power generation devices 13A and 13B includes power generation units 24A and 24B, condensers 25A and 25B, working medium pumps 26A and 26B, and evaporators 22A and 22B. The constituent elements of the steam binary power generation devices 13A and 13B are sequentially provided in sealed pipe lines 27A and 27B through which the working medium circulates. The sealed pipe lines 27A and 27B are secondary side flow paths of the evaporators 22A and 22B. The working medium is, for example, an organic medium such as HFC245fa (alternative chlorofluorocarbon).

  The power generation units 24A and 24B include screw turbines 28A and 28B and generator main bodies 30A and 30B connected to the rotation shafts 29A and 29B of the screw turbines 28A and 28B. The generator main bodies 30A and 30B are provided with transmission lines 35A and 35B for transmitting the generated power. In the power generation units 24A and 24B, the sealed pipe lines 27A and 27B are connected to the steam inlets 31A and 31B and the steam outlets 32A and 32B of the screw turbines 28A and 28B. The generator main bodies 30A and 30B generate third generated power by passing the steam of the working medium through the screw turbines 28A and 28B and driving the screw turbines 28A and 28B.

  The condensers 25A and 25B are provided with heat medium flow passages 33A and 33B for circulating a heat medium (third heat medium) heated by exchanging heat with the working medium of the sealed pipe lines 27A and 27B. In the present embodiment, the third heat medium is water supplied to the heat medium flow passages 33A and 33B via the cooling tower or not.

  The working medium pumps 26A and 26B have a function of causing the working medium condensed in the condensers 25A and 25B to expand and vaporize in an adiabatic state to change the state to low pressure and low temperature.

  The evaporators 22A and 22B are provided with steam inlets 23A and 23B to which the first branch flow paths 21A and 21B of the downstream steam supply flow path 16B through which the steam (first heat medium) flows are connected. The evaporators 22A and 22B are provided with steam outlets 34A and 34B to which third branch passages 37A and 37B described later are connected. The evaporators 22A and 22B are configured such that heat exchange can be performed between the working medium of the sealed pipe lines 27A and 27B and the first heat medium that is the steam of the downstream steam supply passage 16B.

  A reflux passage 36 is provided downstream of the steam binary power generation devices 13A and 13B. The reflux flow path 36 has two branch flow paths (third branch flow paths) 37A and 37B on the upstream side, and the upstream ends of the third branch flow paths 37A and 37B are respectively connected to the evaporator 22A and the evaporator 22A. It is connected to the steam outlets 34A and 34B of 22B. The downstream end of the reflux flow path 36 is connected to the woody biomass boiler 11. The recirculation flow path 36 and the vapor supply flow path 16 are flow paths through which the first heat medium is circulated, and are primary flow paths of the evaporators 22A and 22B.

  A pump 38 is provided in the return flow path 36 downstream of the merged portion 36a of the third branch flow paths 37A and 37B. The pump 38 recirculates the first heat medium, which is hot water condensed by the evaporators 22A and 22B of the steam binary power generation devices 13A and 13B, to the woody biomass boiler 11.

  A heat exchanger 39 is provided in the reflux flow path 36 downstream of the merged portion 36a of the third branch flow paths 37A and 37B and upstream of the pump 38. The heat exchanger 39 is provided with a heating channel 40 through which a heat medium (second heat medium) heated by exchanging heat with the first heat medium is circulated. In the present embodiment, the second heat medium is cold spring water supplied from a hot bath facility.

  The renewable energy utilization power generation apparatus 14 of this embodiment is a solar power generation apparatus. The solar power generation device 14 includes a solar power generation unit 41 and a power transducer 42.

  The solar power generation unit 41 is a solar panel, and converts the energy of sunlight into electric energy and outputs electric power (first generated electric power). The solar power generation unit 41 is provided with a power transmission line 43 that transmits the first generated power, and the power transmission line 43 is electrically connected to the first power integration panel 50.

  The power transducer 42 detects the generated power in the solar power generation unit 41 and transmits the detected value to the control device 15.

  The control device 15 is connected to the power transducer 42 so as to receive the detection value of the first generated power from the power transducer 42. The control device 15 is electrically connected to the steam generator 12 and the steam binary power generation devices 13A and 13B.

  The control device 15 includes a first control unit 15a and a second control unit 15b. Each of the first control unit 15a and the second control unit 15b includes a CPU (not shown) and a memory (not shown).

  In the memory (not shown) of the first control unit 15a, the first power generation from the power transducer 42 is performed at a preset first interval (a relatively short cycle interval of 20 minutes or less, for example, an interval of 20 minutes). A first program that stores a plurality of detected values of power is stored. In addition, when a predetermined number (5 in this embodiment) of data is stored in the memory (not shown) in the first program, a CPU (not shown) is used based on the stored data. Further included is a program for executing a calculation based on the forward moving average method described below. The memory (not shown) stores a plurality of data about the generated power peak value Lmax of solar power generation and the preset average power generation amount Lave per year corresponding to the generated power peak value Lmax.

  The memory (not shown) of the second control unit 15b stores the first from the power transducer 42 at a preset second interval (relatively long cycle interval, for example, 6 hour interval) longer than the first interval. A second program for storing a plurality of detected values of the generated power is stored. Further, when a predetermined number of data (5 in this embodiment) is stored in the memory (not shown) in the second program, a CPU (not shown) is used based on the stored data. Further included is a program for executing a calculation based on the forward moving average method described below. The memory (not shown) stores a plurality of data about the generated power peak value Lmax of solar power generation and the preset average power generation amount Lave per year corresponding to the generated power peak value Lmax.

  In the forward moving average method, for example, when the number of preset data is 5, the past four values (calculated values) A1 to A4 of the detection values detected by the power transducer 42 and the current detection value B5 Is substituted into the number (1) to obtain a calculated value A5, and this calculated value A5 is employed instead of the detected value B5.

[Equation 1]
A5 = (A1 + A2 + A3 + A4 + B5) / 5 (1)

  Similarly, A6 is calculated by the order (2).

[Equation 2]
A6 = (A2 + A3 + A4 + A5 + B6) / 5 (2)

  Each of the first programs includes a program for storing a calculated value AX employed in place of the detected value BX in a memory (not shown) as a first average value and deleting the oldest calculated value.

  In the first program, the steam generator 12 is configured so that the sum of the first generated power that is the first average value and the second generated power generated by the steam generator 12 is set. A program to change the rotation speed is included.

  Each of the second programs includes a program for storing a calculated value AX employed instead of the detected value BX in a memory (not shown) as a second average value and deleting the oldest calculated value. Each of the second programs includes a program for reading the generated power peak value Lmax that matches the calculated value AX and resetting the average power generation amount Lave corresponding to the read generated power peak value Lmax to the set generated power. ing.

  In the second program, when the set generated power is reset, the set power generation in which the sum of the second average value as the first generated power and the second generated power generated by the steam generator 12 is reset A program for changing the rotation speed of the steam generator 12 so as to be electric power is included.

  The control device 15 controls the operation state of the steam generator 12 (rotational speed control, load control, unload control). That is, the control device 15 is based on the magnitude of the first generated power so that the sum of the first generated power and the second generated power becomes the preset set generated power output to the system 53. The magnitude of the second generated power is controlled. Accordingly, the first generated power and the second generated power are in an inversely proportional relationship.

  The generated power smoothing system 10 is provided with a bypass passage 46. The bypass channel 46 has two branch channels (second branch channels) 47A and 47B on the downstream side. The upstream end of the bypass channel 46 is connected to the upstream steam supply channel 16 </ b> A between the woody biomass boiler 11 and the steam generator 12. The ends of the second branch channels 47A and 47B are connected to the first branch channels 21A and 21B. The bypass passage 46 is provided with a steam pressure reducing valve 48 for reducing the upstream pressure (primary pressure) to a preset secondary pressure.

  The generated power smoothing system 10 is provided with a first power integration panel 50 capable of integrating the first generated power transmitted through the transmission line 43 and the second generated power transmitted through the transmission line 20. Yes. The sum of the integrated first generated power and second generated power is preset set generated power output to the grid 53. The first power integration panel 50 is connected to a later-described second power integration panel (second power integration means) 51 via a transmission line 56.

  In the generated power smoothing system 10, the power integrated by the first power integration panel 50 and transmitted by the transmission line 56, the power generated by the steam binary power generation devices 13A and 13B, and transmitted by the transmission lines 35A and 35B. A second power integration panel 51 capable of integrating the three generated powers is provided. The second power integration panel 51 is provided with a transmission line 52 for transmitting the integrated generated power. The power transmission line 52 is connected to the system 53.

  The operation of the generated power smoothing system 10 of the present invention having the above configuration will be described.

  When sunlight is irradiated to the solar power generation unit 41 during the day, the first power generation is generated in the solar power generation unit 41 and output to the transmission line 43. The first generated power is detected by the power transducer 42 and the detected value is transmitted to the control device 15.

  On the other hand, the woody biomass boiler 11 heats water using woody biomass as a fuel to generate a certain amount of water vapor per unit time. The generated water vapor is sent to the upstream-side steam supply channel 16 </ b> A and the bypass channel 46. The steam sent to the bypass passage 46 passes through the pressure reducing valve 48 only when the upstream pressure (primary pressure) of the bypass passage 46 exceeds a preset secondary pressure. That is, only surplus steam that has not been used by the steam generator 12 passes through the pressure reducing valve 48.

  The detection value received from the power transducer 42 is stored in the first control unit 15a of the control device 15 at a preset first interval (a relatively short cycle interval of 20 minutes or less, for example, an interval of 20 minutes) (see FIG. (Not shown). Data of a preset number in a memory (not shown) (5 in the present embodiment, the last four detection values (calculated values) A1 to A4, current detection value B5) detected by the power transducer 42) Is stored, a calculation based on the forward moving average method is executed by a CPU (not shown) based on the stored data. Thereby, the first control unit 15a obtains the calculated value A5 and adopts the calculated value A5 instead of the detected value B5. Thereafter, the first control unit 15a becomes the set generated power in which the sum of the first generated power which is the calculated value A5, that is, the first average value A5, and the second generated power generated by the steam generator 12 is set. Thus, the rotation speed of the steam generator 12 is changed. The rotation speed is changed, for example, by braking the steam generator 12 with an inverter (not shown) so as to control the supply pressure or exhaust pressure of the screw turbine (positive displacement rotating machine) 17.

  Under this control, the screw turbine 17 is driven by passing the water vapor sent to the upstream side steam supply passage 16 </ b> A through the inside of the steam generator 12. Thereby, the generator main body 18 generates the second generated power. The second generated power generated by the steam generator 12 is output to the transmission line 20 via an inverter and a converter (not shown), and the first generated power output to the transmission line 43 in the first power integration panel 50 Integrated. Thereafter, the generated power obtained by integrating the first generated power and the second generated power is transmitted to the transmission line 56, and then the second power integrated panel 51 generates power generated by the generator main bodies 30A and 30B. 3 and is transmitted to the system 53 via the transmission line 52.

  The steam discharged from the steam generator 12 passes through the downstream steam supply flow path 16B and is sent to the branch flow paths 21A and 21B. The steam in the branch channels 21A and 21B is sent to the evaporators 22A and 22B of the steam binary power generation devices 13A and 13B shown in FIG. In the evaporators 22A and 22B, the working medium in the sealed pipe lines 27A and 27B of the steam binary power generation devices 13A and 13B is vaporized by heat exchange, and the water vapor sent from the branch flow paths 21A and 21B is condensed. The condensed warm water is sent to the branch flow paths 37A and 37B. The warm water in the branch flow paths 37A and 37B merges at the merge portion 36a, flows into the reflux flow path 36, and is sent to the woody biomass boiler 11 by the pump 38. The hot water sent from the reflux channel 36 is heated by the biomass boiler 11 to become steam, and the steam is sent to the steam supply channel 16.

  In the heat exchanger 39, the cold spring water (second heat medium) in the heating flow path 40 is heated by heat exchange with the hot water in the reflux flow path 36, and is supplied as hot spring water to a hot bath facility (not shown).

  By passing the working medium vaporized by the evaporators 22A and 22B of the steam binary power generation devices 13A and 13B through the screw turbines 28A and 28B, the generator main bodies 30A and 30B are driven, and the power generation units 24A and 24B Generated power is generated. The third generated power generated by the power generation units 24A and 24B is output to the transmission lines 35A and 35B, and the generated power obtained by integrating the first generated power and the second generated power output to the transmission line 56, and Integrated in the second power integration panel 51. Thereafter, the generated power integrated by the second power integration panel 51 is transmitted to the system 53 via the transmission line 52.

  When the amount of sunlight decreases due to the sun blocking by the clouds, the first amount of generated power generated in the photovoltaic power generation unit 41 decreases. Therefore, the first average value of the first generated electric power calculated by the first control unit 15a is decreased at every preset first interval (for example, every 20 minutes). Therefore, in order to maintain the set generated power, the second generated power is increased. That is, the 1st control part 15a raises the rotation speed of the steam generator 12. FIG.

  When the amount of sunlight increases, the first amount of generated power generated by the photovoltaic power generation unit 41 increases. Therefore, the first average value of the first generated power calculated by the first control unit 15a is increased at each preset first interval (for example, every 20 minutes). Accordingly, the second generated power is decreased in order to maintain the set generated power. That is, the 1st control part 15a reduces the rotation speed of the steam generator 12. FIG.

  Due to a decrease in the rotational speed of the steam generator 12, that is, a decrease in the amount of water vapor flowing into the upstream steam supply channel 16A, surplus steam is generated in the upstream steam supply channel 16A. Therefore, surplus steam is sent to the branch flow paths 21 </ b> A and 21 </ b> B through the pressure reducing valve 48 of the bypass flow path 46 that bypasses the steam generator 12. The sent steam merges with the steam discharged from the steam generator 12 and is sent to the evaporators 22A and 22B of the binary power generators 13A and 13B.

  Even if the amount of sunlight increases or decreases in a short time, as described above, for example, based on the first average value of the first generated power calculated at intervals of 20 minutes, the rotation speed of the steam generator 12 Therefore, the set power generation can be generated stably. Therefore, it is possible to smooth the generated electric power that fluctuates for a short period by power generation using sunlight.

  In this embodiment, as shown in FIG. 2, evaporators 22 </ b> A and 22 </ b> B configured such that heat exchange is possible between the primary flow path for circulating the first heat medium and the secondary flow path for circulating the working medium. Binary power generators 13A and 13B having Therefore, the thermal energy possessed by the steam that has passed or bypassed the steam generator 12 can be recovered by the binary power generators 13A and 13B, and the energy efficiency can be improved.

  The steam generator 12 is stopped when it is raining and when there is no power generated by the solar power generation unit 41 at night. As a result, the steam in the upstream steam supply flow path 16A can be allowed to flow into the bypass flow path 46 and pass through the pressure reducing valve 48 without passing through the steam generator 12. The steam that has passed through the pressure reducing valve 48 flows into the evaporators 22A and 22B of the binary power generators 13A and 13B through the branch flow paths 21A and 21B. Thereby, it is possible to generate power by driving the steam binary power generation devices 13A and 13B without depending on the amount of solar power generation, in other words, the power generation amount of the steam generator 12, and always generate stable power. .

  The detection value received from the power transducer 42 is stored in the second control unit 15b of the control device 15 at a preset second interval (a relatively long cycle interval longer than the first interval, for example, an interval of 6 hours). (Not shown). Data of a preset number in a memory (not shown) (5 in the present embodiment, the last four detection values (calculated values) A1 to A4, current detection value B5) detected by the power transducer 42) Is stored, a calculation based on the forward moving average method is executed by a CPU (not shown) based on the stored data. Thereby, the second control unit 15b obtains the calculated value A5 and adopts the calculated value A5 instead of the detected value B5. Then, the second control unit 15b stores the calculated value A5 as a second average value in a memory (not shown), and reads the generated power peak value Lmax that matches the calculated value A5. The second control unit 15b resets the average power generation amount Lave corresponding to the read generated power peak value Lmax to the set generated power. Thereafter, the second control unit 15b sets the set generated power in which the sum of the first generated power that is the calculated value A5, that is, the first average value A5, and the second generated power generated by the steam generator 12 is reset. Thus, the rotation speed of the steam generator 12 is changed. In this way, the magnitude of the second generated power generated by the steam generator 12 is controlled based on the magnitude of the first generated power generated by sunlight so as to be a preset set generated power. Since it can be controlled by the device 15, the set generated power can be generated stably for a long period. Therefore, it is possible to smooth the generated electric power that fluctuates for a short period by power generation using sunlight.

  As described above, in both the short period and the long period, it is possible to smooth the generated power that changes in a short period by power generation using sunlight.

  Of the steam from the woody biomass boiler 11, surplus steam excluding the steam used in the steam generator 12 is circulated through the bypass channel 46, whereby the energy of the surplus steam can be directly recovered by the binary power generators 13A and 13B. And energy efficiency can be improved.

  It has the 2nd electric power integration board 51 which can integrate the set generated electric power and the 3rd generated electric power generated by binary power generator 13A, 13B which collects the thermal energy which the steam which passed steam generator 12 holds. . Therefore, the total amount of generated power can be increased while smoothing the generated power.

  The primary side flow path has a steam supply flow path 16 and a reflux flow path 36, and one end of the reflux flow path 36 passes through the evaporators 22A and 22B of the binary power generation devices 13A and 13B. Connected with. The other end of the reflux flow path 36 is connected to the wood biomass boiler 11 and includes a pump 38 that recirculates the warm water condensed by the evaporators 22A and 22B of the binary power generators 13A and 13B to the wood biomass boiler 11. Therefore, the hot water in the reflux flow path 36 condensed by the evaporators 22A and 22B of the binary power generators 13A and 13B is returned to the wood biomass boiler 11 by the pump 38, and the thermal energy of the hot water is reused in the wood biomass boiler 11. Can do. Thereby, energy efficiency can be improved.

  A heat exchanger 39 for exchanging heat between the hot water in the reflux channel 36 and the cold spring water in the heating channel 40 is provided in the reflux channel 36 upstream of the pump 38. Therefore, a part of the thermal energy of the warm water in the reflux channel 36 can be transmitted to the cold spring water in the heating channel 40 via the heat exchanger 39, and the cold spring water is heated at a lower cost than using fossil fuel. And you can get hot spring water. For example, hot water of about 90 ° C. that has been condensed by flowing into the binary power generators 13A and 13B can be heated to about 60 ° C. by exchanging heat with cold spring water of about 25 ° C. of the hot bath facility. Can be supplied to hot bath facilities. In hot bath facilities, it is common practice to use hot spring water by exchanging heat with hot water from a hot water boiler. The types of hot water boilers include city gas boilers, kerosene boilers, LPG boilers, and heavy oil boilers, and fuel costs account for most of their operating costs. Replacing these fossil fuel-fired boilers with a system in which the heat exchanger 39 is provided in the return flow path 36 as described above will greatly reduce the fuel consumption in the bathing facility in addition to the revenue from selling the generated power. Effect can be increased.

  Woody biomass fuel that is not a dangerous substance can be used as the fuel for the steam generating means 11, and the fuel can be easily managed.

  The steam consumption of the steam turbine generator 12 is at most several percent (for example, about 4%) of the passing steam amount. When the rotational speed of the steam turbine 12 varies, the steam turbine exhaust steam amount varies greatly. However, since the bypass passage 46 is provided in the steam supply passage 16, the combined flow rate of the steam flowing in from the pressure reducing valve 48 that bypasses the steam turbine 12 and the amount of steam passing through the steam turbine 12 is the generated power of the steam turbine 12. It is almost constant regardless of fluctuations. Therefore, the steam binary power generation devices 13A and 13B downstream of the steam turbine 12 can generate power stably and transmit power.

  In addition, the smoothing system 10 of the generated electric power of the present invention is not limited to the configuration of the above embodiment, and various modifications are possible as exemplified below.

  The renewable energy utilizing power generation device 14 may be a power generation device that generates power using wind power.

  The steam generation means 11 may be a boiler or an electric heater other than the woody biomass boiler as long as it generates steam.

  The steam generator 12 may be any positive displacement rotary machine such as a scroll, a rotary, a tooth compressor, and a screw.

  An opening / closing valve may be provided in the upstream steam supply flow path 16 </ b> A downstream of the branch portion, and the opening / closing of the opening / closing valve may be controlled by the control device 15. Alternatively, an opening / closing valve may be provided in each of the upstream steam supply passage 16A downstream of the branching portion and the bypass passage 46 upstream of the pressure reducing valve 48, and the control device 15 may control the opening / closing of each of the opening / closing valves. Good. Alternatively, a three-way valve may be provided as an on-off valve at the branch portion of the upstream side steam supply passage 16A, and the opening / closing may be controlled by switching the passage of the three-way valve by the control device 15. According to this configuration, the flow path can be switched so that the entire amount of the steam from the steam generating means 11 is circulated only to the bypass flow path 46 side without being circulated to the steam generator 12 side. In the case of not performing power generation, power can be generated only by the steam binary power generation devices 13A and 13B.

  The steam generation means 11 preferably generates the steam using at least one of biomass fuel, geothermal heat, or solar heat. According to this configuration, steam can be generated by utilizing unused renewable energy. The apparatus of the present invention can be suitably installed in a mountainous area in Japan where forest resources are blessed and thinned wood that is used as biomass fuel can be easily procured.

10 Smoothing system for generated power 11 Woody biomass boiler (steam generation means)
DESCRIPTION OF SYMBOLS 12 Steam generator 13A, 13B Steam binary power generator 14 Renewable energy utilization power generator 15 Control apparatus 15a 1st control part 15b 2nd control part 16 Steam supply flow path 16A Upstream steam supply flow path 16B Downstream steam supply flow path 17 Displacement type rotary machine 17a Steam inlet 18 Generator body 19 Rotating shaft 20 Transmission line 21A, 21B Branch flow path (first branch flow path)
22A, 22B Evaporator 23A, 23B Steam inlet 24A, 24B Power generation unit 25A, 25B Condenser 26A, 26B Working medium pump 27A, 27B Sealed pipe line 28A, 28B Expander 29A, 29B Rotating shaft 30A, 30B Generator body 31A, 31B Steam inlet 32A, 32B Steam outlet 33A, 33B Heat medium flow path 34A, 34B Steam outlet 35A, 35B Transmission line 36 Reflux flow path 36a Merged portion 37A, 37B Branch flow path (third branch flow path)
38 Pump 39 Heat exchanger 40 Heating channel 41 Photovoltaic power generation unit 42 Power transducer 43 Power transmission line 46 Bypass channel 47A, 47B Branch channel (second branch channel)
48 Pressure reducing valve 49 Three-way valve 50 First power integration panel (first power integration means)
51 Second power integration panel (second power integration means)
52 Transmission line 53 System 56 Transmission line

Claims (10)

  1. A renewable energy-based power generation device that generates first generated power by sunlight or wind power;
    Steam generating means for generating steam;
    A steam generator for generating second generated power by driving a positive displacement rotary machine with the steam supplied from the steam generation means via a steam supply flow path;
    First power integration means capable of integrating the first generated power and the second generated power;
    A power transducer for detecting the first generated power of the renewable energy power generation device;
    Based on the magnitude of the first generated power, the sum of the first generated power and the second generated power detected by the power transducer becomes a preset set generated power. And a control device for controlling the magnitude of the generated power of 2 .
    The control device controls a rotation speed of the steam generator based on a first average value calculated from a plurality of detection values from the power transducer detected at a preset first interval. And resetting the set generated power based on a second average value calculated from a plurality of detected values from the power transducer detected at a second interval preset in advance at an interval longer than the first interval. A smoothing system for generated power , comprising two control units .
  2. A renewable energy-based power generation device that generates first generated power by sunlight or wind power;
    Steam generating means for generating steam;
    A steam generator for generating second generated power by driving a positive displacement rotary machine with the steam supplied from the steam generation means via a steam supply flow path;
    First power integration means capable of integrating the first generated power and the second generated power;
    A power transducer for detecting the first generated power of the renewable energy power generation device;
    Based on the magnitude of the first generated power, the sum of the first generated power and the second generated power detected by the power transducer becomes a preset set generated power. A control device for controlling the magnitude of the generated power of 2;
    The primary side flow path for circulating the first heat medium, which is the steam in the steam supply flow path downstream from the steam generator, and the secondary side flow path for circulating the working medium are configured to be able to exchange heat. A binary power generator with an evaporator,
    A smoothing system for generated power , comprising second power integration means capable of integrating the power integrated by the first power integration means and the third generated power generated by the binary power generator .
  3. A binary power generation apparatus having an evaporator in which a primary flow path for circulating the first heat medium and a secondary flow path for circulating the working medium are configured to be able to exchange heat;
    2. The generated power smoothing system according to claim 1, wherein the first heat medium in the primary flow path is steam in the steam supply flow path downstream of the steam generator.
  4.   A bypass having one end connected to the steam supply channel between the steam generating means and the steam generator and the other end connected to the steam supply channel between the steam generator and the binary power generator The smoothing system of the generated electric power of Claim 3 provided with a flow path.
  5.   5. The generated power smoothing system according to claim 4, further comprising an on-off valve that can be switched so that the steam from the steam generating unit flows in at least one of the steam supply channel and the bypass channel.
  6.   6. The apparatus according to claim 3, further comprising a second power integration unit capable of integrating the power integrated by the first power integration unit and the third generated power generated by the binary power generation device. A smoothing system for generated power.
  7. The primary channel has the steam supply channel and a reflux channel,
    The reflux channel has one end connected to the steam supply channel via the evaporator of the binary power generation device and the other end connected to the steam generating means.
    7. The smoothing of generated power according to claim 3, wherein the reflux flow path includes a pump that recirculates the first heat medium condensed by the evaporator of the binary power generation apparatus to the steam generation unit. System.
  8.   The generated electric power according to claim 7, further comprising a heat exchanger provided in the return flow path upstream of the pump to exchange heat between the first heat medium and the second heat medium in the return flow path. Smoothing system.
  9.   The generated steam smoothing system according to any one of claims 1 to 8, wherein the steam generating means generates the steam by using at least one of biomass fuel, geothermal heat, and solar heat.
  10.   The generated steam smoothing system according to any one of claims 1 to 8, wherein the steam generating means is a biomass boiler that uses woody biomass fuel.
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