JP2005218193A - Cogeneration system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cogeneration system that can obtain the effect of cost and energy saving. <P>SOLUTION: This cogeneration system is provided with a forecast atmospheric temperature output portion 53 that outputs data of a today's forecast representative atmospheric temperature; a memory 54 that stores time change data of load electric energy at each representative atmospheric temperature in advance; a data-extracting portion 55 that extracts time change the data that correspond to the representative atmospheric temperatures of the data outputted by the forecast atmospheric temperature output portion 53; and an operation time setting portion 56 that sets the operation time of a cogeneration facility 4 where the operation time includes peak load electric energy and load electric energy less than power source electric energy generated by the cogeneration facility 4. This facility 4 is operated during the operation time, an electricity-accumulating facility 32 is charged during a charging period, and the electric power of the electricity-accumulating facility 32 is used as load electric power during the period other than the charging period. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention comprises a cogeneration facility and a power storage facility that is charged with surplus power excluding the load power supplied to each load out of the power generated by the power source, and is linked to a commercial power source. This is related to the cogeneration system.

  In recent years, it has been accepted that low-pollution and small-scale power generation efficiency is high, and there are increasing cases of introducing cogeneration equipment that generates a power source and a heat source from fuel and supplies them to each load.

  By the way, with the emergence of power storage equipment consisting of sodium-sulfur (NaS) batteries, the power storage equipment must be charged with a low-cost commercial power source at night, and the power of the power storage equipment can be used in the daytime when prices are high. Thus, a system for reducing the overall utility cost has been proposed.

Patent Document 1 discloses an operation control system that operates a cogeneration facility (cogeneration apparatus) in accordance with staying home.
JP 2002-190309 A

  However, even if the power storage equipment as described above is combined with the cogeneration equipment, the power storage equipment is charged with a low-priced night commercial power source, and the power of the power storage equipment is used in the daytime when the charge is high, the cogeneration equipment In connection with, energy saving effect is not obtained though it is cost-saving.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a cogeneration system capable of obtaining cost saving and energy saving effect.

  The invention according to claim 1 for solving the above-mentioned problem is a cogeneration facility that generates a power source and a heat source from fuel and supplies the load to each load, and among the power of the power source generated by the cogeneration facility, each load Is a cogeneration system that is connected to a commercial power source and is configured with power storage equipment that is charged with surplus power excluding load power supplied to the vehicle, and outputs at least the predicted representative temperature data for today Output means, storage means for preliminarily storing time variation data of load electric energy in a predetermined time zone for each representative temperature, and time fluctuation corresponding to the representative temperature of the data output from the storage means by the predicted temperature output means Data extraction means for extracting data and each load of time variation data in a predetermined time zone extracted by the data extraction means An operation time setting means for setting a time zone including a load power amount that is lower than a peak load power amount and a power amount generated by the cogeneration facility as an operation time of the cogeneration facility. In the charging period during which the operation time set by the operation time setting means is operated, the cogeneration facility is operated, and the power amount of the power generated by the cogeneration facility exceeds the load power amount supplied to each load. The power storage facility is charged, and the power of the power storage facility is used as the load power outside the charging period.

  In this configuration, the time variation of the load power amount related to the temperature in the predetermined time zone of the day is predicted by extracting the time variation data of the load power amount in the predetermined time zone corresponding to the representative temperature predicted today. The time period that includes the peak load energy and the load power that is lower than the power generated by the cogeneration facility based on the predicted fluctuation in load energy over time In addition to being able to charge the power storage facility, the operation time of the cogeneration facility can be suitably set, and an energy saving effect can be obtained. Furthermore, the cost saving effect can be obtained by using the power of the power storage equipment as the load power outside the charging period.

  According to a second aspect of the present invention, in the cogeneration system according to the first aspect, the operation time setting means is configured to fully charge the power storage facility during the charging period based on the time variation data extracted by the data extraction means. The operation time is set so as to be a period to perform. In this configuration, it is possible to secure the maximum power of the power storage facility outside the charging period, and it is also possible to secure a power source during instantaneous determination and power outage.

  According to a third aspect of the present invention, in the cogeneration system according to the first aspect, the operation time setting means is based on time variation data corresponding to at least the representative temperature predicted today, extracted by the data extraction means. Determining the amount of load power supplied to each load in the daytime power hours of the commercial power source, and this load power amount from the cogeneration facility and the power storage facility to each load in the daytime power hours of the commercial power source. The operation time is set by adjusting the charging period so as to be supplied. In this configuration, the cogeneration facility and the power storage facility supply the load power to each load during the daytime power hours of the commercial power supply, so that the contract power can be set to the power used in the midnight hours. Depending on the capacity of the power storage facility, the utility cost can be reduced as compared with the invention of claim 3.

  According to a fourth aspect of the present invention, in the cogeneration system according to any one of the first to third aspects, the operation time setting means has at least one of a start time and an end time of the operation time as the charging period becomes longer. Is shifted to at least one of a start time and an end time of a daytime power time zone of the commercial power supply, and the operation time is set, and both the start time and the end time of the operation time are If there is a shortage in the charging period even after shifting to the start time and end time of the daytime power hours of the power supply, the start time of the operation time is shifted to the midnight power hours of the commercial power supply. The operation time is set. In this configuration, the cogeneration facility can be operated mainly during the daytime power hours of high-priced commercial power supplies, so it is possible to reduce utility costs and the operating hours have entered the midnight power hours of commercial power supplies. In some cases, the effect of reducing utility costs is slightly reduced, but the cogeneration facility is operating stably when it enters the daytime power hours of commercial power sources that require more load power. Stable supply of load power by cogeneration facilities is possible.

  A fifth aspect of the present invention is the cogeneration system according to any one of the first to fourth aspects, wherein the cogeneration facility is operated at an operation time and a rated output set by the operation time setting means. And In this configuration, the cogeneration facility can be operated with high efficiency, and the utility cost can be further reduced.

  A sixth aspect of the present invention is the cogeneration system according to any one of the first to fifth aspects, further comprising date specifying means for specifying a date, wherein the storage means is load power for each season, month or day. Time variation data of quantity is stored in advance for each representative temperature, and the data extraction means is a representative of the data corresponding to the date specified by the date specifying means and output by the predicted temperature output means from the storage means Time variation data corresponding to the temperature is extracted. In this configuration, since the sunshine time can be taken into consideration, the time variation data of the load power amount can be stored in the storage means in advance so that the variation of the illumination load power amount can be predicted. As a result, by extracting the time fluctuation data of the load power amount based on the season, the month, or the day, it is possible to more appropriately predict the time fluctuation of the load power amount.

  The invention according to claim 7 is the cogeneration system according to any one of claims 1 to 6, wherein the temperature measuring means for measuring the temperature and the temperature data storage for storing the data of the temperature measured by the temperature measuring means. And the predicted temperature output means predicts and outputs at least the representative temperature of the day based on the data stored in the temperature data storage means. In this configuration, since today's representative temperature is predicted based on the temperature at the location where the cogeneration system is installed, it is possible to more appropriately predict the time variation of the load power related to the temperature.

  According to an eighth aspect of the present invention, in the cogeneration system according to any one of the first to sixth aspects, the predicted temperature output means receives at least representative temperature data predicted today from an external device via a communication network. It is characterized by receiving and outputting. In this configuration, for example, by connecting to an external device that predicts today's representative temperature using a weather satellite or the like, it is possible to obtain more accurate representative temperature data predicted today.

  ADVANTAGE OF THE INVENTION According to this invention, the cogeneration system from which a cost saving and an energy saving effect are acquired can be provided.

(Embodiment 1)
FIG. 1 is a configuration diagram of a cogeneration system according to a first embodiment of the present invention.

  As shown in FIG. 1, the cogeneration system according to the first embodiment includes a power facility 1 and a waste heat utilization facility 2 as in the conventional case. The cogeneration facility 4 and the control device 5 are provided.

  Since the power equipment 1 and the waste heat utilization equipment 2 are the same as those in the prior art, the former power equipment 1 includes a power receiving / transforming equipment 11 and a distribution board 12 connected to a commercial power source. Power is supplied from 12 to each power load LD. Further, on the downstream side of the power receiving / transforming equipment 11, for example, the distribution board 12 is connected to a disconnector from the outputs of the secondary power supply equipment 3 and the cogeneration equipment 4, and detection of the load power amount to each power load LD. A load power detector is provided.

  The latter waste heat utilization facility 2 uses the waste heat from the cogeneration facility 4 for heating, cooling, hot water supply, etc. As an example, the waste heat utilization from the cogeneration facility 4 is used for heating, etc. An exhaust heat boiler 21 that outputs steam, an absorption refrigerator 22 and a cooling tower 23 that output cooling water using the steam, and a heat exchanger that outputs hot water for hot water supply using the steam described above 24 and a hot water tank 25.

  The secondary power supply facility 3 includes a converter 31 that converts AC power from the cogeneration facility 4 into DC power, a power storage facility 32 that is charged with the DC power of the converter 31, and a DC power stored in the power storage facility 32. Is converted to AC power and output by an inverter 33. The power storage facility 32 is composed of, for example, a sodium / sulfur (NaS) battery, and is charged with surplus power excluding the load power supplied to each power load LD among the power of the power generated by the cogeneration facility 4. . If the cogeneration facility 4 is configured to output DC power, the converter 31 can be omitted.

  For example, the cogeneration facility 4 generates a power source and a heat source from fuel such as gas and oil and supplies the generated power to each load (the load on the power load LD and the waste heat utilization facility 2 side). And a generator 42 that outputs AC power according to the driving of the turbine engine 41. The cogeneration facility of the present invention is not limited to the turbine engine 41, and may be a gas engine or a fuel cell.

  The control device 5 includes a computer, a semiconductor storage device, a hard disk device, a communication device, and the like, and executes various controls of the exhaust heat utilization facility 2, the secondary power supply facility 3, and the cogeneration facility 4, and uses the exhaust heat. The facility 2 is controlled in the same manner as in the prior art, and the secondary power supply facility 3 and the cogeneration facility 4 are controlled by the communication unit 51, the date specifying unit 52, , A predicted temperature output unit 53, a storage unit 54, a data extraction unit 55, and an operation time setting unit 56.

  Since the control for the waste heat utilization equipment 2 is the same as the conventional one, for example, the absorption refrigeration machine 22 is controlled by proportional control of the heat source water three-way valve according to the cold water outlet temperature, operation of the absorption chiller 22. Then, control such as two-position control of the cooling water three-way valve and start / stop of the cooling water pump by the stop signal is executed. The control of the heat exchanger 24 includes proportional control of the three-way valve based on the return temperature, selective proportional control on the three-way valve based on the signal from the hot water temperature and the heat source water temperature, controller control based on the heat source water pump operation, and two positions of the hot water circulation pump Control etc. are executed.

  The communication unit 51 is configured by a communication device such as a router, for example, and performs bidirectional communication via a communication network L such as the Internet.

  The date specifying unit 52 includes a timer with a calendar function and specifies today's date. The communication unit 51 may periodically access the time server via the communication network L to synchronize the date.

  The predicted temperature output unit 53 is a processing function unit configured by, for example, a computer and a program, and based on today's date by the date specifying unit 52, at least the current day from the external device 6 via the communication network L by the communication unit 51. In the first embodiment, the data of the predicted maximum temperature is received and output today. The representative temperature predicted today is not limited to today, and may be acquired on the previous day, as long as the configuration is acquired before the specified earliest operation time described later of today's cogeneration facility 4. Moreover, the representative temperature of the present invention is not limited to the maximum temperature, and may be an average temperature or a combination thereof.

  The storage unit 54 is configured by a semiconductor storage device, a hard disk device, or the like, and time-variation data of the load power amount (total load power amount) to each power load LD in a predetermined time zone (for example, 24 hours if it is 1 day) Are stored in advance for each representative temperature. In the first embodiment, as shown in (Table 1) and (Table 2), the time variation data of the load power amount for each time of month is stored in advance for each representative temperature.

  In addition, the memory | storage means of this invention may memorize | store beforehand the time fluctuation data of load electric energy not only according to time according to a month but according to time according to season, according to time of day, etc. according to representative temperature. Further, an air temperature measurement unit (air temperature detection sensor) is provided, and based on the representative air temperature detected by the air temperature measurement unit and the load power amount obtained from the detection result of the load power detector, the data in the storage unit 54 is stored. The corresponding contents may be automatically updated.

  The data extraction unit 55 is a processing function unit configured by, for example, a computer and a program, and extracts time variation data corresponding to the representative temperature of the data output by the predicted temperature output unit 53 from the storage unit 53. . In the first embodiment, time variation data corresponding to the representative temperature of the data corresponding to the date specified by the date specifying unit 52 and output by the predicted temperature output unit 53 is extracted from the storage unit 53.

  FIG. 2 shows an example of setting the operation time according to representative temperatures of summer, for example, 20 ° C. (a) and 30 ° C. (b), and FIG. 3 shows representative examples of winter, for example, 10 ° C. (a) and 0 ° C. (b). An example of setting the operation time according to the temperature is shown. 2 and 3, A indicates the time variation of the load power amount due to the data extracted by the data extraction unit 55, and B indicates the operation time of the cogeneration facility 4.

  The operation time setting unit 56 is a processing function unit configured by, for example, a computer and a program. As shown in each example of FIGS. 2 and 3, the operation time setting unit 56 stores time variation data in a predetermined time zone extracted by the data extraction unit 55. Of each load power amount (total load power amount), cogeneration is performed for a time zone including a peak load power amount and a load power amount lower than the power amount of the power source (generator 42) generated by the cogeneration facility 4. The operation time of the facility 4 is set.

  In the first embodiment, based on the time variation data extracted by the data extraction unit 55, processing for setting the operation time is performed so that the charging period becomes a period in which the power storage facility 32 is fully charged. In the processing, as the charging period necessary for fully charging the power storage facility 32 becomes longer, at least one of the start time and the end time of the operation time of the cogeneration facility 4 is set, for example, from the initial setting time to the commercial power supply. By shifting to at least one of the start time and the end time of the daytime power period, a process for setting the operation time is executed.

  In addition, if both the start time and end time of the operation time are shifted to the start time and end time of the daytime power hours of the commercial power source, respectively, Processing for setting the operation time by shifting to the specified foremost operation time (2:00 in the example of FIGS. 2 and 3) at the maximum during the midnight power time zone (22:00 to 7:00) of the commercial power source Is executed. The specified foremost operation time is set according to the startup performance of the cogeneration facility 4, the output capabilities of the secondary power supply facility 3 and the cogeneration facility 4, the effect of reducing utility costs, and the like. From the above maximum operation time, according to the charging time, the maximum operation time is shortened in the reverse procedure to the above, and today's operation time is set so as to include the peak load electric energy time zone. You may do it.

  Then, the control device 5 operates the cogeneration facility 4 at the rated output for the operation time set by the operation time setting unit 56, and the power amount of the power generated by the cogeneration facility 4 is applied to each power load LD. The power storage facility 32 is charged in a charging period that exceeds the supplied load power amount, and basically all the power of the power storage facility 32 is used as load power outside the charging period. More specifically, for example, the control device 5 compares the load power detected by the load power detector in the distribution board 12 with the output of the cogeneration facility 4, and the output of the cogeneration facility 4 is the load power. When the load power detected by the detector is exceeded, the surplus power excluding the load power detected by the load power detector from the output of the cogeneration facility 4 is stored up to the maximum allowable input power of the power storage facility 32 Control (output control) for driving the converter 31 is performed so as to be input to the facility 32. In addition, the surplus electric power exceeding the allowable maximum input electric power of the power storage facility 32 is sent to the power sale.

  Next, the operation of the first embodiment will be described. When the predetermined time before the specified earliest operation time is reached, the predicted temperature output unit 53 acquires the representative temperature predicted today from the external device 6 based on today's date by the date specifying unit 52. Subsequently, the data extraction unit 55 extracts time variation data corresponding to the representative temperature of the data output by the predicted temperature output unit 53 from the storage unit 53.

  Subsequently, among the load power amounts of the time variation data extracted by the data extraction unit 55 by the operation time setting unit 56, the load power amount that is a peak and the power amount of the power source generated by the cogeneration facility 4 are below. The time zone including the load power amount is set as the operation time of the cogeneration facility 4. The operation time is set such that the charging period is a period in which the power storage facility 32 is fully charged. At this time, as the charging period becomes longer, at least one of the start time and the end time of the operation time of the cogeneration facility 4 is shifted to at least one of the start time and the end time of the daytime power hours of the commercial power supply. The operation time is set. If both the start time and the end time of the operation time are shifted to the start time and the end time of the daytime power hours of the commercial power source, respectively, The operation time is set by shifting up to the specified foremost operation time during the midnight power hours of the commercial power source.

  Thereafter, the control device 5 operates the cogeneration facility 4 at the rated output for the operation time set by the operation time setting unit 56, and the power amount of the power generated by the cogeneration facility 4 is applied to each power load LD. While the power storage facility 32 is charged during the charging period exceeding the supplied load power amount, basically all the power of the power storage facility 32 is used as load power outside the charging period.

  FIG. 4 shows an operation example in the summer, and FIG. 5 shows an operation example in the winter. 4 (a), (c), (e) and FIGS. 5 (a), (c), (e) show a conventional operation example of only the cogeneration facility 4 for comparison, and FIG. ), (D), (f) and FIGS. 5 (b), (d), (f) show operation examples of the first embodiment.

  Conventionally, as shown in FIGS. 4A and 4C and FIGS. 5A and 5C, the output level LE4 of the electric energy and the output level LC4 of the heat quantity only by the cogeneration facility 4 are respectively supplied to each load. In order not to exceed the power level LE and the heat level LC, and as shown in FIGS. 4 (e) and 5 (e), the power purchase amount P from the commercial power source is constant throughout the day. Be controlled. In addition, P4 in FIG.4 (e) and FIG.5 (e) shows the electric energy by the cogeneration equipment 4. FIG.

  In contrast, in the first embodiment, as shown in FIGS. 4B and 4D and FIGS. 5B and 5D, the cogeneration facility 4 uses the cogeneration facility 4 to secure a charging period for the power storage facility 32. As shown in FIGS. 4 (f) and 5 (f), the power output level LE4 and the heat output level LC4 exceed the power level LE and the heat level LC to each load, respectively. The power purchase amount P at least during the daytime power hours of the commercial power supply is controlled to be reduced to zero.

  Specifically, in the case of summer, as shown in FIG. 4 (f), the control device 5 mainly uses the power of the power storage facility 32 accumulated in the second half of the previous day's operation time and the first half of the current operation time. Control (actual peak cut control) for driving the inverter 33 is performed so as to be used in the daytime power hours of today's commercial power supply. On the other hand, in the case of winter, as shown in FIG. 5 (f), the control device 5 causes the power of the power storage equipment 32 accumulated during the current operation time to be calculated from the end of the operation time to the next operation time. Control for driving the inverter 33 (constant output control) is performed so that the inverter 33 is used up to the start point (for example, the start point of today's operation time). In addition, P34 in FIG.4 (f) and FIG.5 (f) shows the electric energy by the electrical storage equipment 32 and the cogeneration equipment 4. FIG.

  Here, the effects of the case of only the cogeneration facility 4 and the case of the power storage facility 32 and the cogeneration facility 4 differ depending on the simple recovery years and the energy saving rate. For cogeneration equipment 4, consider power generation efficiency, thermal efficiency, overall efficiency, initial cost (main body, construction), and maintenance costs. For power storage equipment 32, consider overall efficiency, maintenance cost, initial cost (main body, construction). To do. As for energy costs, power unit price and gas unit price are considered.

  When the above items are taken into consideration, if the capacity of the cogeneration facility 4 is the same, the simple recovery years and the energy saving rate are as follows. That is, in a hospital with contracted power of 864 kW, a cogeneration facility 4 with an output of 610 kW class (for example, CGS 610 kW) is used in partial load operation, and there is no power storage facility 32, the simple recovery period is 13.50 years, and the energy saving rate is 18 8%. On the other hand, in the configuration in which the operation mode is full load operation and the power storage facility 32 is provided, the simple recovery years are 10.52 years and the energy saving rate is 22.7%.

  Moreover, when the capacity | capacitance of the cogeneration equipment 4 changes with the presence or absence of the electrical storage equipment 32, a simple collection years and an energy saving rate are as follows. That is, in a hospital with a contract power of 1440 kW, a cogeneration facility 4 with an output of 305 kW (for example, CGS 305 kW) is used at full load operation, and the configuration without the power storage facility 32 has a simple recovery period of 17.30 years and an energy saving rate of 23. .3%. On the other hand, when the cogeneration facility 4 having an output of 610 kW class (for example, CGS 610 kW) is used in full load operation and the power storage facility 32 is provided, the simple recovery years are 7.26 years and the energy saving rate is 25.7%. .

  As described above, according to the first embodiment, by extracting the time variation data of the load power amount in the predetermined time zone corresponding to the representative temperature predicted today, the load power amount related to the temperature in the predetermined time zone of today is extracted. Time fluctuation can be predicted, and based on the predicted time fluctuation of the load power amount, a time zone including a peak load power amount and a load power amount lower than the power amount of the power source generated by the cogeneration facility 4 is obtained. By setting the operation time of the cogeneration facility 4, the power storage facility 3 can be charged, and the operation time of the cogeneration facility 4 can be suitably set, so that the above energy saving effect is obtained. Furthermore, the cost saving effect can be obtained by using the power of the power storage facility 3 as the load power outside the charging period.

  In addition, the operation time setting unit 56 sets the operation time based on the time variation data extracted by the data extraction unit 55 such that the charging period for the power storage facility 32 is a period for fully charging the power storage facility 32. As a result, it is possible to secure the maximum power of the power storage facility 32 outside the charging period, and it is also possible to secure the power supply during the instantaneous determination and power failure.

  In addition, as the charging period becomes longer, the operation time is shifted to the start / end time of the daytime power hours of the commercial power supply, so that even if the operation time is set and shifted to the start / end time, the battery is charged. When there is a shortage in the period, the operation time is set by shifting the start time of the operation time into the midnight power hours, so the cogeneration facility 4 can be operated mainly in the daytime hours when the charges are high. In addition to being able to reduce utility costs, if the operation time enters the midnight power hours, the utility cost reduction effect will be slightly reduced, but it will enter the daytime electricity hours that require more load power. Since the cogeneration facility 4 is operating stably at the time, the load power can be stably supplied. Here, at the time of start-up, in the case of a 1000 to 1500 kW class gas turbine, it shifts to rated operation in about 40 seconds to 1 minute, and in the case of a gas turbine of several thousand kW to 30,000 kW class, several minutes to 30 minutes. In the case of a gas turbine of 50,000 kW class, it is common to shift to rated operation in about 30 minutes to 1 hour, and to reduce the output over time required for start-up when stopping. It is. Moreover, in the case of a gas engine, it is common to shift to a rated operation in about 6 to 15 minutes when starting, and to reduce the output over several minutes when stopping.

  In addition, when the cogeneration facility 4 is operated at the set operation time and rated output, the high-efficiency operation is possible, and the utility cost can be further reduced.

  In addition, since the storage unit 54 stores the time variation data of the load power amount for each time of month in advance for each representative temperature, the daylight hours can be taken into account, so that the variation of the illumination load power amount can be predicted. Thus, the time variation data of the load power amount can be stored in the storage unit 54 in advance. As a result, it is possible to more appropriately predict the time variation of the load power amount.

  Further, the predicted temperature output unit 53 receives and outputs at least the predicted representative temperature data of the current day from the external device 6 via the communication network 51 by the communication unit 51, and outputs the current temperature using, for example, a weather satellite. By connecting to an external device that predicts the representative temperature thereafter, it is possible to obtain at least the data of the representative temperature predicted today, which is more certain.

(Embodiment 2)
FIG. 6 is a configuration diagram of a control device in the cogeneration system according to the second embodiment of the present invention.

  The cogeneration system according to the second embodiment includes the power facility 1, the exhaust heat utilization facility 2, the secondary power source facility 3, and the cogeneration facility 4 as in the first embodiment, as shown in FIG. In addition, a control device 5A different from the first embodiment is provided.

  In addition to the communication unit 51, the date specifying unit 52, the storage unit 54, and the data extracting unit 55 similar to those in the first embodiment, the control device 5A includes a predicted temperature output unit 53A and an operation time setting unit that are features of the second embodiment. 56A.

  The predicted temperature output unit 53A receives at least the representative temperature, for example, the highest temperature data predicted today, from the external device 6 via the communication network L by the communication unit 51 based on today's date by the date specifying unit 52. Output. In the second embodiment, the representative temperature data predicted today and tomorrow is received and output from the external device 6.

  Based on the time variation data extracted by the data extraction unit 55, the operation time setting unit 56A performs processing for setting the operation time of the cogeneration facility 4 so that the charging period becomes a period for fully charging the power storage facility 32. Instead, the configuration is the same as the operation time setting unit 56 of the first embodiment except that the following processing is executed.

  That is, based on the time fluctuation data corresponding to at least the representative temperature predicted today, which is extracted by the data extraction unit 55, the power load LD in the daytime power hours (7:00 to 22:00) of the commercial power source is calculated. Obtain the amount of load power to be supplied, and adjust the charging period for the power storage facility 32 so that the load power amount is supplied from the power storage facility 32 and the cogeneration facility 4 to each power load LD in the daytime power hours of the commercial power supply. Then, processing for setting the operation time is performed.

  The representative temperature predicted tomorrow may be used as tomorrow's representative temperature. However, in the second embodiment, since today's and tomorrow's representative temperatures are acquired, time variation data corresponding to tomorrow's predicted representative temperatures are used as the basis. Next, the amount of load power supplied to each power load LD in the daytime power time zone of tomorrow's commercial power supply is obtained, and this load power amount is obtained from the power storage facility 32 and the cogeneration facility 4 in the daytime power time zone of tomorrow's commercial power supply. Based on the time variation data corresponding to today's predicted representative temperature, a process for adjusting the charging period for the power storage facility 32 and setting the operation time is executed so as to be supplied to each power load LD.

  Next, the operation of the second embodiment will be described. When the predetermined time before the specified earliest operation time is reached, the predicted temperature output unit 53 acquires the representative temperature predicted today and tomorrow from the external device 6 based on today's date by the date specifying unit 52. Subsequently, the data extraction unit 55 extracts time variation data corresponding to the representative temperature of the data output by the predicted temperature output unit 53 from the storage unit 53.

  Subsequently, among the load power amounts of the time variation data extracted by the data extraction unit 55 by the operation time setting unit 56, the load power amount that is a peak and the power amount of the power source generated by the cogeneration facility 4 are below. The time zone including the load power amount is set as the operation time of the cogeneration facility 4. The operation time is set so that power is supplied from the power storage facility 32 and the cogeneration facility 4 to each power load LD in the daytime power time zone of tomorrow's commercial power supply. At this time, as the charging period becomes longer, at least one of the start time and the end time of the operation time of the cogeneration facility 4 is shifted to at least one of the start time and the end time of the daytime power hours of the commercial power supply. The operation time is set. If both the start time and the end time of the operation time are shifted to the start time and the end time of the daytime power hours of the commercial power source, respectively, The operation time is set by shifting up to the specified foremost operation time during the midnight power hours of the commercial power source.

  Thereafter, the control device 5 operates the cogeneration facility 4 at the rated output for the operation time set by the operation time setting unit 56, and the power amount of the power generated by the cogeneration facility 4 is applied to each power load LD. While the power storage facility 32 is charged in a charging period exceeding the supplied load power amount, the power of the power storage facility 32 is used as load power mainly in the daytime power hours of tomorrow's commercial power supply outside the charging period.

  As described above, according to the second embodiment, the load power amount in the daytime power time zone of the commercial power source is obtained, and this load power amount is basically supplied to each power load LD only from the power storage facility 3 and the cogeneration facility 4. In addition, by adjusting the charging period and setting the operation time, the contract power can be set to the power used in the midnight time zone, and the utility cost can be reduced more than in the first embodiment.

  That is, in the first embodiment, since the power storage facility 3 is fully charged, the start time of the operation time of the cogeneration facility 4 is likely to enter the midnight power time zone as shown in FIGS. 4 and 5. According to the mode 2, it is possible to make it difficult for the start time of the operation time to enter the midnight power time zone.

  In the second embodiment, the charging period is adjusted so that the load electric energy is basically supplied from each of the power storage facility 3 and the cogeneration facility 4 to each power load LD. In some cases, it is not possible to completely reduce the amount of power purchased in the daytime power hours of the vehicle according to the predicted load power amount in order to consume the power of the power storage facility 3 as predicted. You may make it adjust the output of the inverter 33 so that the electric power of the electrical storage equipment 3 may be used.

(Embodiment 3)
FIG. 7 is a configuration diagram of a control device in the cogeneration system according to the second embodiment of the present invention.

  As a difference from the first and second embodiments, the cogeneration system of the third embodiment replaces the communication unit 51, the storage unit 54, and the predicted temperature output units 53 and 53A with an air temperature measurement unit that measures the temperature (outside air temperature). 57, a storage unit 54A that further stores the data of the temperature measured by the temperature measurement unit 57, and a predicted temperature output that predicts and outputs today's representative temperature based on the data stored in the storage unit 54A And 53B.

  More specifically, the predicted temperature output unit 53B obtains the average value of the representative temperatures for a predetermined number of days (for example, one week) based on the data stored in the storage unit 54A, and uses this average value as the representative temperature of today. Is configured to output as

  According to the third embodiment, when the weather is stable by predicting today's representative temperature based on the temperature of the location where the cogeneration system is installed, today's representative temperature is not so different from the above average value. As a result, it is possible to more suitably predict the time variation of the load power related to the temperature.

It is a block diagram of the cogeneration system of Embodiment 1 by this invention. It is a figure which shows the example of a setting of the driving time according to the summer representative temperature. It is a figure which shows the example of a setting of the driving time according to the winter representative temperature. It is a figure which shows the operation example in the case of summer. It is a figure which shows the operation example in the case of winter. It is a block diagram of the control apparatus in the cogeneration system of Embodiment 2 by this invention. It is a block diagram of the control apparatus in the cogeneration system of Embodiment 2 by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric power equipment 11 Power receiving and transformation equipment 12 Distribution board 2 Waste heat utilization equipment 21 Waste heat boiler 22 Absorption-type refrigerator 23 Cooling tower 24 Heat exchanger 25 Hot water storage tank 3 Secondary power supply equipment 31 Converter 32 Power storage equipment 33 Inverter 4 Cogeneration equipment 41 Turbine engine 42 Generator 5, 5A, 5B Control device 51 Communication unit 52 Date specifying unit 53, 53A, 53B Predicted temperature output unit 54, 54A Storage unit 55 Data extraction unit 56, 56A Operating time setting unit 57 Temperature measurement unit

Claims (8)

Cogeneration facility that generates power and heat source from fuel and supplies it to each load, and of the power of the power generated by this cogeneration facility, it is charged with surplus power excluding load power supplied to each load It is a cogeneration system that consists of power storage equipment and is linked to commercial power.
Predicted temperature output means for outputting at least the representative temperature data predicted today,
Storage means for storing time variation data of load electric energy in a predetermined time zone in advance for each representative temperature;
Data extraction means for extracting time fluctuation data corresponding to the representative temperature of the data output by the predicted temperature output means from the storage means;
Of each load power amount of the time variation data extracted by this data extraction means, a time including a load power amount that is a peak and a load power amount that is lower than the power amount of the power generated by the cogeneration facility An operation time setting means for setting a belt to the operation time of the cogeneration facility,
The cogeneration facility is operated for the operation time set by the operation time setting means, and the power storage is performed during a charging period in which the amount of power generated by the cogeneration facility exceeds the amount of load power supplied to each load. A cogeneration system characterized by charging equipment and using the power of the power storage equipment as the load power outside the charging period.   The operation time setting means sets the operation time so that the charging period becomes a period for fully charging the power storage facility, based on the time variation data extracted by the data extraction means. The cogeneration system according to claim 1.   The operating time setting means is a load supplied to each load in the daytime power time zone of the commercial power source based on time fluctuation data extracted by the data extraction means and corresponding to at least the representative temperature predicted today. The amount of electric power is obtained, and the operation time is set by adjusting the charging period so that the load electric energy is supplied from the cogeneration facility and the power storage facility to the loads in the daytime power hours of the commercial power source. The cogeneration system according to claim 1. The operation time setting means includes
As the charging period becomes longer, the operation time is shifted by shifting at least one of the start time and the end time of the operation time to at least one of the start time and the end time of the daytime power time zone of the commercial power supply. Set,
If both the start time and end time of the operation time are shifted to the start time and end time of the daytime power hours of the commercial power source, respectively, and the charging period is insufficient, the start of the operation time The cogeneration system according to any one of claims 1 to 3, wherein the operation time is set by shifting the time during a midnight power time zone of the commercial power source.   The cogeneration system according to any one of claims 1 to 4, wherein the cogeneration facility is operated at an operation time and a rated output set by the operation time setting means. A date specifying means for specifying the date,
The storage means stores in advance the time variation data of the load electric energy for each season, month or day, for each representative temperature,
The data extracting means extracts time variation data corresponding to the representative temperature of the data corresponding to the date specified by the date specifying means and output by the predicted temperature output means from the storage means. The cogeneration system according to any one of claims 1 to 5. A temperature measuring means for measuring the temperature;
Temperature data storage means for storing temperature data measured by the temperature measurement means,
The cogeneration system according to any one of claims 1 to 6, wherein the predicted temperature output means predicts and outputs at least a representative temperature of today based on data stored in the temperature data storage means. system.   7. The cogeneration system according to claim 1, wherein the predicted temperature output means receives and outputs at least representative temperature data predicted today from an external device via a communication network. .

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