JP2014230429A - Power consumption controller, program used for the same, recording medium, power consumption apparatus, power consumption control system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control operation of a power consumption apparatus in such a manner as to track electric power varying with time.SOLUTION: A power consumption controller (21) has a function of controlling operation of a power consumption apparatus such as a turbo refrigerator 23, and includes: a receiving part that receives a signal of a power consumption command value; and a power consumption adjustment part. The power consumption adjustment part adjusts electric power consumed by the power consumption apparatus so as to reduce a difference between the power consumption command value and the electric power value consumed by the power consumption apparatus.

Description

  The present invention relates to a power consumption control device, a program and a recording medium used therefor, a power consumption device, and a power consumption control system using the same.

  The electric power supplied to the commercial power system is managed by the electric power company adjusting the power generation amount of the hydroelectric power plant and the thermal power plant.

  On the other hand, with the aim of realizing a sustainable society in the future, solar energy, wind power, tidal power and other renewable energy are being actively introduced. In addition to renewable energy, the spread of distributed power sources including fuel cells, power generation gas engines and the like is also being promoted.

  When a distributed power source is connected to a commercial system (electric power company's power grid, also referred to as “commercial power system”), renewable energy whose output fluctuates depending on the weather will increase in the future. There is a concern that the stability of the frequency of commercial power may be adversely affected, and there is a need for a technique that compensates for output fluctuation due to renewable energy.

  As a countermeasure, a method for securing the stability of the commercial power system using a storage battery has been studied. However, there is a charge / discharge loss (about 20%) and the installation cost is expensive. The challenges are clear.

  Therefore, from the viewpoint of suppressing investment in social infrastructure using an existing gas engine generator or fuel cell as an alternative to a storage battery, Patent Document 1 describes the power of a distributed power source that performs integrated control by combining a gas engine and a fuel cell. A power generation output control system that suppresses output fluctuation when a fluctuation in output of renewable energy or load fluctuation occurs in a supply system is disclosed.

  Also, in recent years, due to the tightness of power supply and demand, an operator called an aggregator bundles those that own distributed power sources or consume power, and the total of multiple customers according to the tight situation of power supply and demand It is assumed that power is managed (for example, Non-Patent Document 1).

  However, existing gas engine generators and fuel cells have problems such as limited installation capacity and sacrificing energy saving.

JP 2012-231568 A

http://www.enecho.meti.go.jp/policy/cogeneration/2-1-2.pdf: Agency for Natural Resources and Energy: Efforts to promote the introduction of cogeneration (cogeneration system) (2012 July)

  Patent Document 1 does not suggest a technique for compensating for output fluctuations of a distributed power source including a renewable energy source by controlling power consuming devices.

  The above aggregator supplies the control device of the power consuming device to the owner of the distributed power source or the owner of the power consuming device such as the centrifugal chiller, and reduces the power consumption in the power consuming device according to the output fluctuation of the distributed power source. In order to control, it is also conceivable to manage the power in such a manner that a command value is transmitted for the upper limit value of the usable power or the power desired to be used. In this case, at present, whether or not it is possible to operate the power consuming device with the power that fluctuates in time according to the command value is not sufficiently confirmed.

  An object of the present invention is to control the operation of a power consuming device so as to follow power that varies with time.

  The power consumption control device of the present invention has a function of controlling the operation of a power consuming device, and includes a reception unit that receives a signal of a power consumption command value, and a power consumption adjustment unit. The power consumed by the power consuming device is adjusted so as to reduce the difference between the command value and the value of the power consumed by the power consuming device.

  ADVANTAGE OF THE INVENTION According to this invention, the driving | running of an electric power consumption apparatus can be controlled in the form which follows the electric power which fluctuates temporally. Thereby, the electric power of the electric power system containing renewable energy seen from the commercial power system can be stabilized. In addition, it is possible to easily cope with a case where a command for suppressing power consumption of each power consuming device is issued in response to tightness of power supply and demand.

It is a schematic block diagram which shows the example of the electric power system of a power consumption control system. It is a schematic block diagram which shows the connection relation of a solar energy power generation system and a turbo refrigerator. It is a flowchart which shows the case classification by step control among control of the power consumption requested | required of a turbo refrigerator corresponding to the output of a solar power generation system. It is a flowchart which shows the power consumption control of a turbo refrigerator when the output of a solar power generation system reduces. It is a flowchart which shows the power consumption control of a turbo refrigerator when the output of a solar power generation system increases. It is a flowchart which shows the power consumption control of a turbo refrigerator when the inverter output correction | amendment electric current becomes more than a rated current in FIG. 5A. It is a flowchart which shows the power consumption control of a turbo refrigerator in case the output of a solar power generation system reduces rapidly. It is a flowchart which shows the power consumption control of a turbo refrigerator when the vane opening degree becomes below a lower limit in FIG.4 and FIG.6. It is a flowchart which shows PID control among control of the power consumption requested | required of a turbo refrigerator corresponding to the output of a solar power generation system. It is a flowchart which shows the detail of PID control among control of the power consumption requested | required of a turbo refrigerator corresponding to the output of a solar power generation system. It is a graph which shows the example of the area | region where inverter control and vane control operate | move in the relationship between freezing capacity and cooling water inlet temperature. It is a graph which shows the example (step control) of the tracking property in the inverter control area | region of the power consumption of a turbo refrigerator with respect to the output of a solar power generation system. It is a graph which shows the example (PID control) of the follow-up property in the inverter control area | region of the power consumption of a turbo refrigerator with respect to the output of a solar power generation system. It is a graph which shows the example (step control) of the followability in the vane control area | region of the power consumption of a turbo refrigerator with respect to the output of a solar energy power generation system. It is a graph which shows the example (PID control) of the followability in the vane control area | region of the power consumption of a turbo refrigerator with respect to the output of a solar power generation system.

  Hereinafter, a power consumption control device, a program, a computer-readable recording medium storing the program, a power consumption device, and a power consumption control system according to an embodiment of the present invention will be described.

  The power consumption control device has a function of controlling the operation of a power consuming device, and includes a reception unit that receives a power consumption command value signal and a power consumption adjustment unit, and the power consumption adjustment unit includes a power consumption command value. The power consumed by the power consuming device is adjusted so as to reduce the difference between the power consumed by the power consuming device and the value of the power consumed by the power consuming device.

  The power consumption command value may be a value corresponding to a temporal change in power output from a power generation system connected to the commercial power system, or corresponds to a temporal change in supply power in the commercial power system. It may be a value.

  The program receives a power consumption command value related to the value of power consumed, and controls the operation of the power consumption device so as to reduce the difference between the power consumption command value and the value of power consumed by the power consumption device. Is to make the computer realize. The program can be uploaded and downloaded using a telecommunication line (such as the Internet).

  A computer-readable recording medium in which the program is recorded can be used by being connected to or incorporated in the power consumption control device.

  The power consuming device includes a power consumption control unit including a reception unit that receives a signal of a power consumption command value and a power consumption adjustment unit, and the power consumption adjustment unit includes a power consumption command value and a value of power to be consumed. The structure which has the function to adjust the electric power consumed so that the difference of may be reduced may be sufficient. Here, the power consumption control unit has the function of the power consumption control device. In other words, the power consuming device may have a configuration in which the power consumption control device is incorporated.

  The power consuming device preferably has a configuration in which a plurality of types of electric devices are connected in parallel to the power generation system.

  It is desirable that the power consuming device includes at least one selected from the group consisting of a turbo refrigerator, an absorption refrigerator, a heat storage device, and a water heater.

  When the power consuming device includes a turbo chiller, the turbo chiller is preferably configured to be controlled using step control or PID control.

  The turbo chiller preferably has a configuration capable of inverter control, and is configured to be controlled using the inverter frequency and the chilled water outlet set temperature as parameters.

  The turbo chiller preferably has a configuration capable of inverter control, and is configured to be controlled using the inverter frequency and the capacity control mechanism opening as parameters.

  Hereinafter, the power consumption control system will be described with reference to the drawings, taking a turbo refrigerator as an example.

  FIG. 1 is a schematic configuration diagram illustrating an example of a power system of a power consumption control system.

  In this figure, the power consumption control system 100 includes a photovoltaic power generation system 1, a commercial power system 2, and a turbo chiller 3. Other electrical devices 4, 5, etc. may be connected in parallel with the turbo chiller 3 as necessary. Specific examples of the other electric devices 4 and 5 include a screw chiller, a heat pump water heater, an air conditioner, and an inverter fluorescent lamp.

  Since the output of the solar power generation system 1 varies greatly depending on the weather, a signal instructing the amount of power to be consumed in each of the turbo chiller 3 and the other electrical devices 4 and 5 is sent to the variation in the output. The commercial power system 2 is supplied with electric power with less fluctuation.

  In addition, in this figure, although the case where the solar power generation system 1 is used is shown, instead of the solar power generation system 1, a wind power generation system, a wave power generation system, a tidal power generation system, or the like may be used. . Similar to the solar power generation system 1, these are power generation systems in which the output greatly varies depending on weather, time, and the like.

  FIG. 2 is a schematic configuration diagram illustrating a connection relationship between the photovoltaic power generation system and the turbo chiller.

  In this figure, the photovoltaic power generation system 1 is connected to a turbo chiller 23 via a turbo chiller photovoltaic power generation output fluctuation suppression control unit 21. Here, the solar power generation output fluctuation suppression control unit 21 for the turbo chiller corresponds to a power generation system other than the solar power generation system 1 in FIG. 1 when used for controlling the other electric devices 4 and 5 in FIG. 1. As a term representing a component including a case where it is used for control, it may be simply referred to as an “output fluctuation suppression control unit”.

  The solar power generation system 1 sends a power consumption command value signal to the turbo chiller solar power generation output fluctuation suppression control unit 21. The solar power generation output fluctuation suppression control unit 21 for turbo chiller includes a signal receiving unit, and controls the operation of the turbo chiller 23 according to the signal. In other words, the photovoltaic power generation output fluctuation suppression control unit 21 (output fluctuation suppression control unit) for the turbo chiller includes a reception unit and a power consumption adjustment unit.

  The reception unit of the output fluctuation suppression control unit (also referred to as “power consumption control device”) receives power consumption command value signals from various power generation systems, command value signals from power companies or aggregators, and information on power demand. A signal or the like (also referred to as “power consumption command value”) as a command value is received. The power consumption adjusting unit of the output fluctuation suppression control unit adjusts the power consumption of the turbo chiller and other power consuming devices according to these signals and the like.

  The power consumption adjustment unit incorporates a small computer, receives a power consumption command value (command value related to the value of power consumed), receives the power consumption command value, and the value of power consumed by the power consuming device. A program for controlling the operation of the power consuming equipment so as to reduce the difference. In other words, the power consumption adjustment unit incorporates a computer-readable recording medium that records the program.

  In this figure, although the photovoltaic power generation output fluctuation suppression control part 21 (output fluctuation suppression control part) for turbo refrigerators and the turbo refrigerator 23 are arrange | positioned separately, this invention is not limited to this. Alternatively, the output fluctuation suppression control unit may be incorporated in the turbo refrigerator 23 or other power consuming equipment.

  FIG. 3 is a flowchart showing the case classification in the step control among the control of the power consumption required for the turbo chiller corresponding to the output of the photovoltaic power generation system. Here, step control refers to control in which a control command value is changed step by step.

  In this figure, during power consumption adjustment control operation 301 (during solar power generation output fluctuation suppression operation), a power consumption adjustment control loop is started (302). Here, “PV” is an abbreviation for photovoltaic power generation output fluctuation.

Calculates a difference delta ₁ between the power consumption command value and the turbo power (303), (a set value, for example, about 3 kW) delta ₁ is determined value 1 greater than the delta ₁ and delta ₃ (304), A determination value 3 (a set value, for example, about 15 kW) is determined. In the case of delta ₃ is determined value 3 or less is adapted to perform control to select the command value decreases following mode 306. Further, when the delta ₃ is greater than the determination value 3, performs control by selecting the command value suddenly decreases following mode 308.

Meanwhile, delta ₁ if greater than the judgment value 1, the delta ₁ and delta ₂ (305), (a set value, for example, about -3KW) judgment value 2 to determine the magnitude of the. Here, if the delta ₂ is determined value smaller than 2, the control is performed by selecting the command value increases following mode 307. For delta ₂ determination value 2 or more, it is determined that the substantially same value as the power instruction value to the turbo power, returns to the power adjustment control loop starts (302).

  FIG. 4 shows the details of the control when the command value decrease follow-up mode 304 of FIG. 3 is selected, and is a flowchart showing the power consumption control of the turbo chiller when the output of the photovoltaic power generation system decreases. is there.

  In this figure, the main parameters are the inverter frequency and the vane opening.

  When the command value decrease follow-up mode 401 is started, it is determined whether the inverter frequency is higher or lower than the inverter required frequency (402). Here, the inverter required frequency refers to the frequency of the inverter corresponding to the boundary between the inverter control region and the vane control region (described in FIG. 9 described later) in the command value decrease follow-up mode 401.

  When the inverter frequency is higher than the inverter required frequency, the timer 403 determines whether the time count value of the timer 403 and the inverter frequency correction span are high or low. Here, the inverter frequency correction span refers to the update time interval of the inverter frequency correction amount in the command value decrease tracking mode 401. When the inverter frequency correction span is shortened, the response becomes faster. In the examples described later, the minimum value of the inverter frequency correction span is set to 0.1 seconds.

  When the time count value of the timer 403 is equal to or greater than the inverter frequency correction span, a predetermined additional amount is added to the inverter frequency correction amount to update the inverter frequency correction amount (404). On the other hand, when the time count value of the timer 403 is lower than the inverter frequency correction span, the process returns to the timer 403 again. Increasing the value of the additional amount speeds up the response but roughens the control. In the examples described later, the minimum value of the additional amount is set to 0.1%.

  A value obtained by adding the updated inverter frequency correction amount to the inverter frequency is set as an inverter correction frequency (405).

  Thereafter, the inverter correction frequency is set as a new inverter frequency, and the power consumption adjustment control loop is started again (406). That is, the process returns to the power consumption adjustment control loop start 302 of FIG.

  The above 403 to 405 is the flow of inverter control.

  On the other hand, when it is determined in 402 that the inverter frequency is equal to or lower than the inverter required frequency, the vane opening degree is determined (407). Here, the vane opening is also referred to as a capacity control mechanism opening.

  When the vane opening is equal to or greater than the minimum vane opening, the timer 408 determines whether the time count value of the timer 408 and the cold water outlet set temperature correction span are high or low. Here, the minimum vane opening is the minimum value in the power consumption adjustment control loop.

  When the time count value of the timer 408 is equal to or greater than the chilled water outlet set temperature correction span, a predetermined additional amount is added to the chilled water outlet set temperature correction amount to update the chilled water outlet set temperature correction amount (410). Here, the chilled water outlet set temperature correction span refers to the update time interval of the chilled water outlet set temperature correction amount in the command value decrease tracking mode 401. When the chilled water outlet set temperature correction span is shortened, the response becomes faster. The minimum span is 0.1 seconds. Moreover, since the switching time of the set temperature of the turbo refrigerator main body is 0.1 ° C./6 seconds, the following time is required on the turbo refrigerator side.

| (Cooling water outlet temperature)-(Cooling water outlet correction set temperature) | x 60 (seconds)
That is, it is a value obtained by multiplying the absolute value of the difference between the cold water outlet temperature and the cold water outlet correction set temperature by 60.

  A value obtained by adding the updated chilled water outlet set temperature correction amount to the chilled water outlet set temperature is set as the chilled water outlet corrected set temperature (411), and the power consumption adjustment control loop is started again (406). That is, the process returns to the power consumption adjustment control loop start 302 of FIG.

  On the other hand, when the time count value of the timer 408 is lower than the cold water outlet set temperature correction span, the process returns to the timer 408 again.

  When the vane opening degree is lower than the minimum vane opening degree at the vane opening degree 407, the process proceeds to * 1 (701 in FIG. 7) (409).

  FIG. 7 is a flowchart showing power consumption control of the turbo chiller when the vane opening is lower than the minimum vane opening (lower limit).

  In this figure, it is determined whether the difference between the turbo power consumption and the power consumption command value is larger or smaller than the stop power (702).

  When the difference between the turbo power consumption and the power consumption command value becomes equal to or less than the stop power, the power consumption adjustment control loop is started again (703).

  When the difference between the turbo power consumption and the power consumption command value becomes larger than the stop power, the power consumption adjustment control is stopped (704).

  The command value sudden decrease follow-up mode 601 is set separately from the normal control, and is provided for the case where the power consumption adjustment control needs to be stopped (704).

  FIG. 5A shows the details of the control when the command value increase follow-up mode 305 of FIG. 3 is selected, and is a flowchart showing the power consumption control of the turbo chiller when the output of the photovoltaic power generation system increases. is there.

  In this figure, the main parameters are the inverter frequency and the chilled water outlet set temperature.

  When the command value increase follow-up mode 501 is selected, the inverter output correction current and the rated current are distinguished from each other (502).

  When the inverter output correction current is smaller than the rated current, the inverter frequency correction amount is determined (503). When the inverter frequency correction amount is less than 0%, the timer 504 determines whether the time count value of the timer 504 and the inverter frequency correction cancellation span are large or small.

  If the time count value of the timer 504 is equal to or greater than the inverter frequency correction cancellation span, a predetermined additional amount is added to the inverter frequency correction amount to update the inverter frequency correction amount (505). On the other hand, when the time count value of the timer 504 is lower than the inverter frequency correction span, the process returns to the timer 504 again. Here, the inverter frequency correction cancellation span refers to an update time interval of the inverter frequency correction amount in the command value increase tracking mode 501. When the inverter frequency correction cancellation span is shortened, the response becomes faster. In the examples described later, the minimum value of the inverter frequency correction cancellation span is set to 0.1 second.

  A value obtained by adding the updated inverter frequency correction amount to the inverter frequency is set as an inverter correction frequency (506).

  Thereafter, the inverter correction frequency is set as a new inverter frequency, and the process returns to 503.

  When the inverter frequency correction amount is 0% or more, the power consumption adjustment control loop is started again (507). That is, the process returns to the power consumption adjustment control loop start 302 of FIG.

  If the inverter output correction current is equal to or greater than the rated current at 502, the process proceeds to * 2 (551 in FIG. 5B) (508).

  FIG. 5B is a flowchart showing power consumption control of the turbo chiller when the inverter output correction current is equal to or higher than the rated current in FIG. 5A.

  In this figure, the inverter output current correction amount is set to 0 (552), and the control for forcibly closing the vane of the turbo chiller is canceled (553). That is, the load restriction of the turbo chiller is released.

  In FIG. 5A, when the inverter output correction current is smaller than the rated current, the magnitude of the chilled water outlet set temperature correction amount is determined simultaneously with the determination of the inverter frequency correction amount (503) (509). When the chilled water outlet set temperature correction amount is larger than 0 ° C., the timer 510 determines whether the time count value of the timer 510 and the chilled water outlet set temperature correction cancellation span are large or small.

  When the time count value of the timer 510 is equal to or greater than the chilled water outlet set temperature correction cancellation span, a predetermined additional amount is added to the chilled water outlet set temperature correction amount to update the chilled water outlet set temperature correction amount (511). On the other hand, when the time count value of the timer 510 is lower than the cold water outlet set temperature correction cancellation span, the process returns to the timer 510 again. Here, when the additional amount is increased, the response becomes faster, but the control becomes rougher. In the examples described later, the minimum value of the additional amount was set to 0.1 ° C. The minimum value of the cold water outlet set temperature correction cancellation span was set to 0.1 seconds.

  A value obtained by adding the updated cold water outlet set temperature correction amount to the cold water outlet set temperature is set as a cold water outlet correction set temperature (512).

  Thereafter, the cold water outlet correction set temperature is set as a new cold water outlet set temperature, and the process returns to 509.

  In 509, when the cold water outlet set temperature correction amount is 0 ° C. or less, 509 is repeated.

  FIG. 6 shows the details of the control when the command value sudden decrease follow-up mode 306 of FIG. 3 is selected. The power consumption control of the turbo chiller when the output of the photovoltaic power generation system suddenly decreases is shown. It is a flowchart to show.

  When the command value sudden decrease follow-up mode 601 is selected, the magnitude of the vane opening and the minimum vane opening is determined (602).

  When the vane opening is larger than the minimum vane opening, the inverter output correction current is determined (603). If the inverter output correction current is less than 105% of the rated current, the inverter output correction current is corrected to 105% of the rated current (604).

  Thereafter, an operation (605) of forcibly closing the vanes of the turbo refrigerator is performed to start or maintain the load limit, and the process returns to 602.

  On the other hand, if the vane opening is equal to or lower than the minimum vane opening at 602, the process proceeds to * 1 (701 in FIG. 7) (606).

  FIG. 8A is a flowchart in the PID control among the control of the power consumption required for the turbo chiller corresponding to the output of the photovoltaic power generation system. Here, PID control is an abbreviation for Proportional Integral Derivative Control.

  In this figure, during the power consumption adjustment control operation 801 by PID control, a PID control mode loop is started (802).

  When the PID control mode is started, it is determined whether the inverter frequency is higher or lower than the inverter required frequency (803).

  If the inverter frequency is higher than the inverter required frequency, PID control of the inverter frequency is performed (804). A value obtained by multiplying the control output value (MV value) of the PID control by the correction coefficient is set as an inverter frequency correction value (805). Next, the inverter frequency command value is obtained by adding the inverter frequency correction value to the inverter frequency (806). Thereafter, the inverter frequency is determined according to the inverter frequency command value, and a PID control mode loop is started again (810).

  On the other hand, when the inverter frequency is equal to or lower than the inverter required frequency in 803, the vane opening PID control is performed (807). A value obtained by multiplying the control output value of the PID control by the correction coefficient is set as a vane opening correction value (808). Next, a value obtained by adding the vane opening correction value to the vane opening is set as the vane opening command value (809). Thereafter, the vane opening is determined according to the vane opening command value, and the PID control mode loop is started again (810).

  Note that the above-described PID control of the vane opening from 807 to 809 is desirably applied, but even when not applied, it may be possible to control only by inverter frequency PID control.

  FIG. 8B shows in more detail the PID control of the inverter frequency from 804 to 806 in FIG. 8A. The PID control of the vane opening degrees from 807 to 809 will be described in more detail.

  In FIG. 8B, in the inverter frequency PID control (804) executed when the inverter frequency is higher than the inverter required frequency, the power consumption command value as the target value is compared with the turbo power consumption as the current value. Then, a control output value (MV value) of PID control is calculated. When the current value is larger than the target value, the control output value (MV value) is subtracted MV (negative value). On the other hand, when the current value is smaller than the target value, the control output value (MV value) is set to addition MV (positive value). The absolute values of the subtraction MV and the addition MV are values proportional to the difference between the power consumption command value and the turbo power consumption.

  In addition, the correction coefficient used when calculating the inverter frequency correction value in 805 can be changed. In other words, the correction coefficient can be changed by the operator to confirm and adjust the operating state of the turbo chiller, etc. It is also possible to change.

  In FIG. 8B, in the PID control (807) of the vane opening performed when the inverter frequency is lower than the inverter required frequency, the magnitude of the power consumption command value that is the target value and the turbo power consumption that is the current value are changed. In comparison, a control output value (MV value) of PID control is calculated. When the current value is larger than the target value, the control output value (MV value) is subtracted MV (negative value). On the other hand, when the current value is smaller than the target value, the control output value (MV value) is set to addition MV (positive value). The absolute values of the subtraction MV and the addition MV are values proportional to the difference between the power consumption command value and the turbo power consumption.

  Moreover, the correction coefficient used when calculating the vane opening correction value at 808 can be changed. In other words, the correction coefficient can be changed by the operator to confirm and adjust the operating state of the turbo chiller, etc. It is also possible to change.

  The above PID control is a special improvement of the normal PID control, and it is difficult to control the operation of the turbo chiller or the like by the normal PID control of the inverter frequency due to this PID control. In addition, the operation of the turbo refrigerator or the like can be controlled.

  FIG. 9 is a graph showing an example of a region in which inverter control and vane control operate in the relationship between the refrigeration capacity of the centrifugal chiller and the cooling water inlet temperature.

  In this figure, the centrifugal chiller can obtain a rated refrigeration capacity (cooling output) of 100% at a cooling water inlet temperature of 32 ° C. When the cooling water inlet temperature is lower than 32 ° C., the refrigerating capacity increases (solid line with downward slanting lines). The lower limit of the freezing capacity (load factor) is 20%. The allowable lower limit value of the cooling water inlet temperature is 12 ° C. These states are represented by squares indicated by solid lines in the figure.

  In addition, the rectangular area is separated by a solid line and a diagonal line rising to the right. The right side of the oblique line is an inverter control area (INV control area), and the left side of the oblique line is a vane control area. This oblique line shows the boundary between the inverter control region and the vane control region. As indicated by the oblique lines, the lower limit value of the inverter control region decreases as the cooling water inlet temperature decreases. In other words, when the cooling water inlet temperature is lowered, the inverter control area is expanded.

  In the case of the turbo chiller shown in the figure, the inverter control is performed in the control for reducing the power consumption, and then the vane control is performed. Therefore, when the cooling water inlet temperature is low, when the refrigeration capacity is lowered, the inverter control is performed up to a region where the refrigeration capacity is relatively small.

  Further, in this figure, a curve with power consumption as a parameter is represented by an equal power consumption line (broken line). From this broken line, it can be seen that when the cooling water inlet temperature is high, the control shifts to vane control even if the power consumption is large.

  FIG. 10 is a graph showing an example (step control) of the follow-up property of the power consumption of the turbo chiller with respect to the output of the solar power generation system, and shows the follow-up property in the inverter control region.

  In the figure, the power command value (broken line) and the power consumption (TR power consumption, solid line) of the turbo refrigerator following this are shown on the upper side. Moreover, in the figure, the lower side shows the difference between the power command value and the TR power consumption as a power deviation (dotted line).

  From this figure, it can be seen that the power deviation is controlled within a range of about ± 5 kW.

  FIG. 11 is a graph showing an example (PID control) of the follow-up property of the power consumption of the turbo chiller with respect to the output of the photovoltaic power generation system, and shows the follow-up property in the inverter control region as in FIG. .

  From this figure, it can be seen that the power deviation is controlled so that the power deviation converges in the range of about 2 to 3% for the power command value having a low frequency. On the other hand, it is understood that the power deviation is controlled in the range of about −3 to 0 kW for the power command value having a high frequency.

  FIG. 12 is a graph showing an example (step control) of the followability of the power consumption of the turbo chiller with respect to the output of the photovoltaic power generation system, and shows the followability in the vane control region.

  From this figure, the power deviation is controlled within a range of ± 15 kW.

  FIG. 13 is a graph showing an example (PID control) of the follow-up property of the power consumption of the turbo chiller with respect to the output of the solar power generation system, and shows the follow-up property in the vane control region as in FIG. .

  From this figure, it is understood that the power deviation is controlled in the range of about ± 5 kW for the power command value having a low frequency. On the other hand, it is understood that the power deviation is controlled in the range of about ± 8 kW for the power command value having a high frequency.

  Comparing Example 1 and Example 2, it can be seen that inverter control using PID control shown in FIG. 11 is effective for a power command value having a low frequency. In other words, inverter control using PID control is more desirable than that using step control.

  Moreover, when Example 3 and Example 4 are compared, it turns out that the vane control using PID control shown in FIG. 13 is effective with respect to the electric power command value with a low frequency. In other words, the vane control using PID control is more desirable than that using step control.

  Hereinafter, the effects of the present invention will be described.

  Electric output from photovoltaic power generation systems and other renewable energy sources varies depending on weather conditions. The present invention uses a power consuming device such as a turbo refrigerator attached to a renewable energy source to consume fluctuations in electrical output from the renewable energy source on the spot. Thereby, the said electrical output can be stably supplied to a commercial power system (system power).

  ADVANTAGE OF THE INVENTION According to this invention, the power consumption of the electric power system containing renewable energy seen from the commercial power grid | system can be stabilized. In addition, even when a command for suppressing the power consumption of each power consuming device is issued in response to the tightness of power supply and demand, it can be handled by continuous control.

  Further, the present invention expands options and capacity for stabilizing commercial power by making it possible to utilize not only power generation equipment such as the gas engine and fuel cell of Patent Document 1 but also power consuming equipment. be able to. It is also an excellent technique in that it does not sacrifice energy saving like a gas engine or a fuel cell.

  1: solar power generation system, 2: commercial power system, 3: turbo chiller, 4, 5: other electrical equipment, 21: solar power generation output fluctuation suppression control unit for turbo chiller, 23: turbo chiller, 100 : Power consumption control system.

Claims (20)

  A power receiving device having a function of controlling operation of a power consuming device and receiving a power consumption command value signal; and a power consumption adjusting unit, wherein the power consumption adjusting unit includes the power consumption command value and the power consumption A power consumption control device that adjusts power consumed by the power consuming device so as to reduce a difference from a value of power consumed by the device.   2. The power consumption control device according to claim 1, wherein the power consumption command value is a value corresponding to a temporal change in power output from a power generation system connected to a commercial power system.   2. The power consumption control apparatus according to claim 1, wherein the power consumption command value is a value corresponding to a change with time of supply power in a commercial power system.   A function of receiving a power consumption command value relating to a value of consumed power and controlling the operation of the power consuming device so as to reduce a difference between the power consumption command value and a value of power consumed by the power consuming device. A program to make it happen.   The program according to claim 4, wherein the power consumption command value is a value corresponding to a temporal change in power output from a power generation system connected to a commercial power system.   The program according to claim 4, wherein the power consumption command value is a value corresponding to a change with time of supply power in a commercial power system.   The computer-readable recording medium which recorded the program as described in any one of Claims 4-6.   The power consumption control unit includes a reception unit that receives a power consumption command value signal and a power consumption adjustment unit, and the power consumption adjustment unit reduces a difference between the power consumption command value and a value of consumed power. A power consuming device having a function of adjusting power consumption so that the power is consumed.   The power consumption apparatus according to claim 8, wherein the power consumption command value is a value corresponding to a change with time of power output from a power generation system connected to a commercial power system.   The power consumption apparatus according to claim 8, wherein the power consumption command value is a value corresponding to a change with time of supply power in a commercial power system.   The power consuming device according to any one of claims 8 to 10, wherein the device that mainly consumes power is selected from the group consisting of a turbo refrigerator, an absorption refrigerator, a heat storage device, and a water heater. .   The apparatus that mainly consumes the electric power is a turbo refrigerator, and the turbo refrigerator is configured to be controlled using step control or PID control. The power consuming equipment described in 1.   13. The power consuming device according to claim 12, wherein the turbo chiller has a configuration capable of inverter control and is controlled using the inverter frequency and the chilled water outlet set temperature as parameters.   13. The power consuming device according to claim 12, wherein the turbo chiller has a configuration capable of inverter control and is controlled using the inverter frequency and the capacity control mechanism opening as parameters.   The apparatus that mainly consumes the electric power is a turbo chiller, and the turbo chiller is configured to be controlled using PID control of an inverter frequency. The PID control is obtained by multiplying a control output value by a correction coefficient. The obtained value is used as an inverter frequency correction value, and a value obtained by adding the inverter frequency correction value to the inverter frequency is used as an inverter frequency command value. Power consuming equipment.   The control output value is a negative value when the current value of the power is larger than the power consumption command value, a positive value when the current value is smaller than the power consumption command value, and the correction coefficient is The power consuming device according to claim 15, which can be changed.   A power consumption control system comprising a power consumption device and the power consumption control device according to any one of claims 1 to 3.   A power consumption control system comprising the power consuming device according to any one of claims 8 to 16.   The power consumption control system according to claim 17 or 18, further comprising a power generation system.   The power consumption control system according to claim 19, wherein the power consumption device has a configuration in which a plurality of types of electric devices are connected in parallel to the power generation system.

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