JP2015162925A - power management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to efficiently perform power supply from a storage battery while mitigating processing operation of a management apparatus (BEMS), in an energy management system capable of reducing frequency for limiting demand power by power supply from a storage battery.SOLUTION: A BEMS 10 predicts power demand (demand) in a facility to be a management target; and sets limitation periods in which power consumption in loads 22, 24, 20, ... is to be limited, while setting a forced discharge period in which forced discharge from a storage battery 38 to a load is performed in a period having a high electric charge. The BEMS 10 limits power consumption in each load and makes the storage battery 38 perform forced discharge, according to the set limitation periods and the forced discharge period. One of the loads is a supply and demand management apparatus 20 that limits power consumption in a subordinate load according to an instruction from the BEMS 10 and makes discharge from the storage battery 38 to the load be performed.

Description

  The present invention relates to a power management system that predicts a load power demand in a facility to be managed and regulates power consumption of a load when a prediction result exceeds an allowable amount.

  Conventionally, in this type of power management system, the management device predicts the power demand of the load and supplies power from the storage battery to the load within a period when the prediction result exceeds the allowable amount, thereby consuming commercial power from the load. It has been proposed to restrict power consumption of a load when the power demand of a commercial power supply by the load exceeds an allowable amount by suppressing power and only supplying power from a storage battery (see, for example, Patent Document 1).

JP 2013-2115012 A

According to the proposed power management system, the frequency of regulating the power consumption of the load can be reduced by supplying power from the storage battery to the load.
However, since the storage battery supplies load driving power to the power line of a commercial power source that supplies power to the load, when multiple loads are connected to the power line, the power is supplied to each load. Cannot be supplied efficiently, and the frequency of regulating the power consumption of the load cannot be sufficiently reduced.

  In other words, when a plurality of loads are connected to the power line, the storage battery supplies power to the plurality of loads via the power line, but when supplying power from the storage battery to the plurality of loads, Since the power supply path to the load becomes long, the transmission loss in the path increases, and the power of the storage battery cannot be used efficiently.

  Further, in the proposed power management system, the management device not only controls the operation of each load in order to regulate the power consumption in each load, but also charges the storage battery using the power line and from the storage battery to the power line. It is necessary to control the discharge. For this reason, there is a problem that the processing load on the management apparatus is increased and that the operation setting of the management apparatus by the administrator is troublesome.

  The present invention has been made in view of such problems, and in a power management system capable of reducing the frequency of regulating power consumption of a load by supplying power from a storage battery when the power demand of the load exceeds an allowable amount. It is an object of the present invention to be able to more efficiently supply power from a storage battery to a load, and to reduce the processing operation of the management device so that the operation setting can be easily performed.

  In the power management system according to claim 1 made to achieve such an object, the management device predicts power demands of a plurality of loads that receive power supply from a commercial power source in a facility to be managed, The power consumption of a plurality of loads is regulated within a period when the prediction result of the power demand of the facility exceeds the allowable amount.

  A specific load connected to a branch line branched from the power line from the commercial power supply among a plurality of loads that receive power supply from the commercial power supply is provided with a control device that controls power supply to the specific load, And the branch line to which the specific load was connected is equipped with the storage battery which can supply electric power to the specific load.

  The management device regulates power consumption to the specific load by transmitting a regulation command to the control device. When the control device receives the regulation command from the management device, the control device supplies power from the storage battery to the specific load. Start.

  Thus, according to the power management system of the present invention, since the storage battery is connected to the branch line to which the specific load is connected, power is directly supplied from the storage battery to the specific load via the branch line. Power loss that occurs in the power supply path (branch line) can be reduced.

  In addition, when the control device controls power supply to the specific load and receives a regulation command from the management device, the control device starts power supply from the storage battery to the specific load. Therefore, the management device controls charging / discharging of the storage battery. The power supply to the specific load using the storage battery can be carried out.

  Therefore, according to this invention, while being able to reduce the processing burden of a management apparatus, the frequency which regulates the power consumption of a specific load can be suppressed by supplying electric power from a storage battery to a specific load.

  Next, in the power management system according to claim 2, the management device uses the control device including the specific load as one load, and powers according to a preset priority order for each of a plurality of loads connected to the power line. Regulate consumption.

  Therefore, according to the power management system of the second aspect, the management apparatus simultaneously regulates power consumption for all loads that receive power supply from the commercial power supply via the power line and the branch line from the power line. Compared with the case where it does in this way, the electric power consumption in each load can be appropriately controlled now, and each load can be operated efficiently.

  Further, in the power management system according to claim 3, the management device predicts the power demand within the next control period based on the past power demand, and regulates the power consumption of each load according to the prediction result. The power consumption of each load is controlled for each control period by making a regulation plan to regulate and regulating the power consumption of each load according to the regulation plan.

  In addition, the management device calculates a prediction error of the power demand based on the measured value of the demand power of each load and the change of the surrounding environment within the control period in which the power consumption of each load is actually regulated. Revise the regulatory plan based on this.

  Therefore, according to the power management system of the third aspect, not only can the power consumption of each load be regulated by setting the regulation plan of the power consumption of each load for each control period, but also the actual power consumption of each load. By modifying the regulation plan according to the power demand, it is possible to control the power demand of each load according to the actual operation of the load.

  In the power management system according to claim 4, the management device sets an allowable amount of power demand according to a fluctuating electricity rate (dynamic pricing) when making a regulation plan for power consumption of each load. .

  Therefore, according to the power management system of the fourth aspect, the regulation plan is made while changing the regulation amount of the power consumption of each load between the period when the electricity charge of the commercial power source is high and the period when the electricity charge is low. The electricity bill paid to the electric power company etc. can be reduced more efficiently.

  In this way, when the regulation plan is made based on the dynamic pricing of the commercial power supply, as described in claim 5, the management device detects a high toll period with a high electricity bill based on the dynamic pricing, During a high fee period, even when there is little demand power and it is not necessary to regulate the power consumption of the load, it is preferable to discharge the storage battery to the branch line or power line.

And if it does in this way, the power consumption paid to an electric power company etc. can be reduced by suppressing the power consumption of a commercial power supply by the discharge from a storage battery in the period when an electricity charge is high.
On the other hand, the dynamic pricing of the commercial power supply may be changed by an electric power company or the like depending on the weather conditions of the day. Therefore, when the management device is configured to make a regulation plan based on the dynamic pricing of the commercial power source as described above, the management device actually uses the power consumption of each load as described in claim 6. It is preferable to monitor the change in the dynamic pricing of the commercial power supply within the control period to be regulated, and correct the regulation plan based on the monitoring result.

  That is, in this way, even when dynamic pricing is changed by an electric power company or the like, the regulatory plan can be reviewed according to the changed dynamic pricing, and the electricity bill can be more reliably reduced.

  Next, when one of the loads that the power management device regulates the power consumption is an air conditioner, the management device controls the air conditioning in the facility when regulating the power consumption of the air conditioning device. The regulated amount may be controlled in accordance with a change in the power demand of the device or the environmental temperature around the facility.

  In other words, in this way, for example, when the power demand of the air conditioner is increasing at high temperatures in summer or when the temperature is rising, the power consumption of the air conditioner is suppressed too much and the environment in the facility is reduced. It is possible to reduce the power consumption of the air conditioner while preventing the deterioration of the air conditioner.

  In addition, when one of the loads that the management device regulates power consumption is a lighting device, when the management device regulates the power consumption of the lighting device, the illuminance in the facility as described in claim 8 It is preferable to control the amount of restriction according to or to restrict the power consumption according to the installation position of the lighting device.

  In other words, in this way, by reducing the power consumption of the lighting device within a range where the illuminance in the facility is not excessively reduced, or by turning off the lighting device in a place where illumination by the lighting device is unnecessary, The power consumption of the entire apparatus can be reduced.

  In addition, when controlling the regulated amount of power consumption of the lighting device according to the illuminance in the facility as described in claim 8, it is necessary to measure the illuminance in the facility. If there is no illuminometer to measure, the illuminance may be estimated from the amount of solar radiation. Further, when there is no illuminometer that measures the amount of solar radiation, the amount of solar radiation (and thus the illuminance in the facility due to solar radiation) can be estimated from the output of a solar power generation device or the like.

  On the other hand, when the power consumption is regulated according to the installation position of the lighting device as described in claim 9, for example, the illumination of the entire facility is turned off, and the illumination at hand in the facility is not turned off. And so on. In this case, it is possible to set in advance the place where the light is turned off and the place where the light is not turned off. However, using a human sensor or the like, it automatically determines where there is no person and adjusts the light. You may make it do.

It is a block diagram showing the structure of the whole power management system of embodiment. It is a flowchart showing the control plan setting process performed in BEMS of embodiment. It is a flowchart showing the restriction plan correction process performed in BEMS. It is explanatory drawing explaining the regulation plan set by the process of FIG. 3, FIG. It is a flowchart showing the load control process performed in BEMS. It is a flowchart showing the regulatory plan review process performed in BEMS. It is explanatory drawing explaining operation | movement of the regulatory plan review process shown in FIG. It is a flowchart showing the air-conditioning load regulation process performed in BEMS. It is a flowchart showing the illumination load regulation process performed in BEMS. It is a flowchart showing the supply-and-demand management process performed with a supply-and-demand management apparatus.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the power management system according to the present embodiment is for managing power demand by a load connected to a power line 4 that receives power supply from a commercial power supply 2 within a predetermined facility. A BEMS (Building Energy Management System) 10 provided on the network 8 is provided as a demand management device.

A plurality of loads such as an air conditioner 22, a lighting device 24, a supply and demand management device 20,... Are connected to the power line 4 in the facility as loads that consume power.
Each of these loads (air conditioner 22, lighting device 24, supply and demand management device 20,...) Incorporates a microcomputer (not shown) having a communication function, and this microcomputer is connected to a wireless or wired communication path. 12 and the gateway (GW) to communicate with the BEMS on the network 8 to regulate its own power consumption.

  Here, the supply and demand management device 20 is a subordinate management device (corresponding to the control device of the present invention) for the BEMS 10, and controls the power consumption of the commercial power supply 2 at the branch lines 4 a and 4 b branched from the power line 4.

  That is, a DC board 30 that converts AC power supplied from the commercial power source 2 to DC and supplies power to the DC load 32 is connected to the branch line 4a, and supplied from the commercial power source 2 to the branch line 4b. An AC board 40 for supplying the AC power to the AC load 42 is connected.

  The DC board 30 is connected to a storage battery 38 capable of charging / discharging direct-current power, and is connected to a solar cell panel (PV) 34 via a power conditioner (PCS) 36.

  The AC panel 40 is connected to an EV charger 48 capable of charging a storage battery (vehicle battery) mounted on an electric vehicle (EV) and taking in electric power from the storage battery, and a power conditioner ( A solar panel (PV) 44 is connected via a PCS) 46.

  The supply and demand management device 20 has a control function, and when receiving a power consumption regulation command from the BEMS 10, the supply and demand management device 20 communicates with a microcomputer provided in the DC board 30 and the AC board 40 via a wireless or wired communication path 14. By performing communication between them, power supply from the DC board 30 to the DC load 32 and power supply from the AC board 40 to the AC load 42 are controlled.

  In addition, when the supply and demand management device 20 controls the power supply to the DC load 32 and the AC load 42 in accordance with the regulation command from the BEMS 10, first, the power supply from the storage battery 38 to the DC load 32 and the AC load 42 is performed. As a result, the power consumption of the commercial power supply 2 on the branch lines 4a, 4b side is suppressed, and when the storage battery 38 alone cannot sufficiently suppress the power supply to the DC load 32 and the AC load 42.

  In addition, when the supply and demand management device 20 can use the power supplied from the solar cell panels (PV) 34 and 44, the power supply is supplied to the DC load 32 and the AC load 42, the storage battery 38, By using it for charging the in-vehicle battery, the power consumption of the commercial power source 2 is suppressed.

  Next, the BEMS 10 regulates the power consumption by the load (the air conditioner 22, the lighting device 24, the supply and demand management device 20,...) Connected to the power line 4 individually, thereby reducing the power demand of the entire facility within a predetermined target range. It is something that is constrained within, and is composed of a computer.

  A period (hereinafter referred to as a control period) for restricting power consumption by the load (air conditioner 22, lighting device 24, supply and demand management device 20,...) Is set in advance, such as every day from 0:00 am to afternoon xx hours. Has been.

  The BEMS 10 predicts the demand in the control period of the next day based on the power demand (hereinafter also referred to as demand) in the control period of the previous day (or the past), and the demand is the target value based on the prediction result. A regulation plan for making a regulation plan for regulating power consumption at each load (air conditioner 22, lighting device 24, supply and demand management device 20,...) Within a control period of the next day so as not to exceed Execute the setting process.

  In addition, during the control period of the next day, the BEMS 10 regulates power consumption at each load (the air conditioner 22, the lighting device 24, the supply and demand management device 20,...) According to the regulation plan set in the regulation plan setting process. In addition to executing the load regulation process to be performed, the regulation plan review process for reviewing the regulation plan is executed based on the actual power demand (actual demand) at each load (air conditioner 22, lighting device 24, supply and demand management device 20,...). To do.

Hereinafter, various control processes executed in the BEMS 10 will be described.
As shown in FIG. 2, in the regulation plan setting process, first, in S110 (S represents a step), loads are sequentially applied in accordance with the priority order of loads subject to regulation of power consumption (load regulation) and the priority order. A demand threshold for determining whether or not to perform restriction is set.

The priority order and the threshold value are set in advance according to the facility to be controlled. In S110, the set priority order and threshold value are read from the memory.
Next, in S120, the demand for the next control period is predicted from the past actual demand information. The demand prediction is performed in consideration of various environmental conditions such as day of the week, season, and weather. However, since the prediction may be performed in the same manner as in the past, detailed description thereof is omitted.

  When the demand of the next control period is predicted in S120, the predicted value of the demand is compared with the first threshold value corresponding to the load A having the highest priority set in S110 in S130. As shown in FIG. 4, a period T1 in which the demand predicted value is equal to or greater than the first threshold is searched, and in subsequent S140, the period T1 is set as a regulation period for regulating the power consumption of the load A.

  Next, in S150, the demand prediction value becomes equal to or higher than the second threshold value as shown in FIG. 4 by comparing the demand prediction value with the second threshold value corresponding to the load B having the second priority. The period T2 is searched, and in the subsequent S160, the period T2 is set as a regulation period for regulating the power consumption of the load B.

  Similarly, in the subsequent S170, the predicted demand value is compared with the third threshold value corresponding to the load C having the third priority (here, the lowest priority), as shown in FIG. As shown in FIG. 4, a period T3 in which the demand predicted value is equal to or greater than the third threshold is searched, and in subsequent S180, the period T3 is set as a regulation period for regulating the power consumption of the load C.

  Then, when the power consumption regulation periods T1 to T3 for the loads A to C are set in this way, the process proceeds to S190, and the regulation periods T1 to T3 are associated with the loads A to C to be regulated. Then, the restriction plan setting process is terminated.

  The loads A to C are selected according to the priority from the loads connected to the power line 4 (air conditioner 22, lighting device 24, supply and demand management device 20,...). Since the number and the number of loads selected for each priority are set according to the facility to be controlled, they are simply described as loads A to C here.

Next, FIG. 3 shows a regulation plan correction process that is performed in the BEMS 10 after the regulation plan setting process shown in FIG. 2 is executed.
This regulation plan correction process is a process for setting the period T4 during which forced supply from the storage battery 38 is performed with respect to the supply and demand management device 20 and including it in the regulation plan. Then, based on the electricity charge data corresponding to the dynamic pricing of the commercial power supply 2, a high charge period during which the electricity charge becomes high is set (see FIG. 4).

  In S220, as shown in FIG. 4, a period T4 that does not overlap with the regulation periods T1 to T3 set in the regulation plan setting process of FIG. 2 is selected from the high fee period, and the period T4 is selected. Is set as a forced discharge period for forced discharge from the storage battery 38.

  Next, in S230, whether or not forced discharge is performed from the storage battery 38 within the forced discharge period T4 based on the remaining capacity of the storage battery 38, the amount of electric power of the storage battery 38 necessary for the implementation of load regulation, or the like (No. That is, it is determined whether or not forced discharge is possible.

  And if forced discharge is possible, it will transfer to S240 and will memorize | store the forced discharge period T4 set in S220 in memory as one of the regulation plans of the next control period, and complete | finish the said regulation plan correction process To do.

If the forced discharge is not possible, the process proceeds to S250 to store in the memory that the storage battery 38 is not forcibly discharged in the next control period, and the regulation plan correction process is terminated.
In other words, in the present embodiment, even if the predicted demand value is lower than the first threshold T1 by setting the forced discharge period T4 in the regulation plan correction process, it is not necessary to implement load regulation. During the high charge period that does not overlap with the regulation periods T1 to T3, the storage battery 38 is discharged to reduce the power consumption (and hence the electricity charge) of the commercial power supply 2.

Next, the load restriction process for actually carrying out the load restriction during the control period is periodically executed in the BEMS 10 every predetermined time (for example, every few minutes).
As shown in FIG. 5, in the load regulation process, first, in S310, it is determined whether or not it is currently the regulation period T1 of the load A. If so, the process proceeds to S320 and the regulation process of the load A is performed. The load regulation for the load A is carried out by starting or continuing. If it is not currently the load A restriction period T1, the process proceeds to S330, and the load A restriction process is terminated, thereby releasing the load restriction on the load A.

  Further, after the load A is regulated in S320, it is determined in S340 whether or not it is currently the regulation period T2 of the load B. If so, the process proceeds to S350, and the load B The load regulation for the load B is performed by starting or continuing the regulation process. If it is not currently the load B regulation period T2, the process proceeds to S360, and the load B regulation process is terminated, thereby releasing the load regulation for the load B.

  Also, after the load B is regulated in S350, it is determined in S370 whether or not it is currently the regulation period T3 of the load C. If so, the process proceeds to S380, and the load C Load regulation for the load C is performed by starting or continuing the regulation process. If it is not the regulation period T3 of the load C at present, the process proceeds to S360, and the regulation of the load C is terminated to cancel the regulation of the load C.

  In addition, the restriction | limiting process of load A, B, C is a process for the power consumption reduction preset for every load (The air conditioner 22, the illuminating device 24, the supply-and-demand management apparatus 20, ...) connected to the power line 4. A specific example of the restriction process for the air conditioner 22 and the lighting device 24 will be described later.

In addition, the regulation process for the supply and demand management device 20 simply transmits a load regulation command to the supply and demand management device 20, and control for reducing power consumption is performed on the supply and demand management device 20 side.
Next, when the load regulation for the load C is performed in S380 or the load regulation for the loads A, B, and C is canceled in S330, S360, and S390, the process proceeds to S400, and the forced discharge period T4 of the storage battery 38 is currently set. It is determined whether or not.

  Then, if it is currently in the forced discharge period T4, the forced discharge command is transmitted to the supply and demand management device 20, and then the load regulation process is terminated. If it is not currently in the forced discharge period T4, the forced supply to the supply and demand management device 20 is forced. After stopping the transmission of the discharge command, the load regulation process is terminated.

  When the forced discharge command is transmitted to the supply and demand management device 20 in S410, the supply and demand management device 20 discharges the storage battery 38 to the DC load 32 or the branch line 4b side through the DC panel 30 to supply and demand. The power consumed on the terminal side of the management device 20 is reduced.

  Next, during the control period, the BEMS 10 also executes a regulation plan review process shown in FIG. 6 separately from the load regulation process. Similar to the load regulation process, this regulation plan review process is a process that is periodically performed in the BEMS 10 every predetermined time (for example, every few minutes).

  As shown in FIG. 6, in the regulation plan review process, first, in S510, the amount of power per unit time currently consumed in the facility is detected as the actual demand, and in S520, the regulation shown in FIG. An error (prediction error) with the predicted value of demand obtained when executing the plan setting process is calculated.

Next, in S530, it is determined whether or not the prediction error calculated in S520 is larger than the allowable value. If the prediction error is equal to or smaller than the allowable value, the process proceeds to S570.
On the other hand, when the prediction error is larger than the allowable value, the process proceeds to S540, and based on the change in the actual demand amount within the current control period, the change in the weather conditions such as the temperature, the operating state of each load, etc. The power demand (demand) within the current control period is predicted (see FIG. 7).

  In the subsequent S550, based on the demand predicted value predicted in S540 (predicted value indicated by a dotted line in FIG. 7) and the electricity price data corresponding to the current dynamic pricing, those shown in FIGS. By resetting the regulation periods T1 to T3 and the forced discharge period T4 in the same procedure, the regulation plan is reviewed, and the process proceeds to S560.

  In S570, it is determined whether or not the dynamic pricing of the commercial power source 2 has been changed since the execution of the regulation plan setting process of FIG. If the dynamic pricing of the commercial power supply 2 has been changed, the regulatory plan is reviewed by resetting the forced discharge period based on the electricity rate data corresponding to the changed dynamic pricing in S580, and S560. Migrate to

  In S560, the regulation plan in the memory is updated with the regulation plan reviewed in S550 or S580, and the regulation plan review process ends. Further, when it is determined in S570 that the dynamic pricing of the commercial power source 2 has not been changed, the regulatory plan review process is also terminated.

  Next, in the load regulation process of FIG. 5, when the air conditioner 22 is selected as the load A, B, or C subject to load regulation, the air conditioning is performed to reduce the power consumption of the air conditioner 22 A description will be given of the load regulation process, and the illumination load regulation process that is performed to reduce the power consumption of the illumination device 24 when the illumination device 24 is selected.

  As shown in FIG. 8, in the air conditioning load regulation process, in S610, it is determined whether or not there is a load regulation command (air conditioning load regulation command) for the air conditioner 22, and if there is no air conditioning load regulation command, the process again in S610. By executing the determination process, the process waits for the air conditioning load regulation command to be set in S320, S350, or S380 of FIG.

  If it is determined in S610 that the air conditioning load regulation command is set, the process proceeds to S620, and the regulation mode for the air conditioner 22 is selected from the preset modes 1 to 3.

  This mode selection is executed according to, for example, the increase in power demand of the entire facility to be controlled or the air conditioner 22 alone, and when the power demand growth is high, the mode 3 with the restriction level “high” is selected. When the power demand growth is low, mode 1 with the regulation level “low” is selected, and when the power demand growth is intermediate between high and low, mode 2 with the regulation level “medium” Is selected.

  When the restriction mode is selected in S620, it is determined in S630 whether the selected restriction mode is mode 1 with a restriction level of “low”. If the restriction mode is mode 1, The process proceeds to S640, and the power consumption of the air conditioner 22 is regulated to “low level” by adjusting the operation settings of the air conditioner 22 (for example, the air conditioner temperature, the amount of conditioned air blown, the number of air conditioners to be operated, etc.). The amount of power corresponding to "is reduced.

  In S640, if the power consumption of the air conditioner 22 is reduced at the restriction level “low”, the process proceeds to S650, and a restriction additional condition for increasing the restriction level of the air conditioner 22 is established by reviewing the above-described restriction plan or the like. Determine whether or not.

  Then, when the additional restriction condition is satisfied, the process proceeds to S690 to be described later in order to change the restriction mode of the air conditioner 22 to mode 2, and when the additional restriction condition is not satisfied, the process proceeds to S660. Then, it is determined whether or not a condition for canceling the load restriction on the air conditioner 22 is satisfied.

  If it is determined in S660 that the release condition is not satisfied, the process proceeds to S650. If it is determined that the release condition is satisfied in S660, the restriction in mode 1 of the air conditioner 22 is performed in S670. Is released and the process proceeds to S610.

  Next, in S630, if it is determined that the restriction mode is not mode 1, the process proceeds to S680, and the restriction mode selected in S620 is mode 2 having a restriction level of “medium”. Determine whether.

  If the restriction mode is mode 2, the process proceeds to S690, and the operation settings of the air conditioner 22 are adjusted to reduce the power consumption of the air conditioner 22 by the amount of power corresponding to the restriction level “medium”.

  Note that the process of S690 is also executed when it is determined in S650 that the restriction addition condition is satisfied. In this case, the restriction mode is switched from mode 1 to mode 2.

  Next, in S690, if the power consumption of the air conditioner 22 is reduced at the regulation level “medium”, the process proceeds to S700, and additional regulation conditions for increasing the regulation level of the air conditioner 22 by reviewing the regulation plan described above or the like. It is determined whether or not is established.

  If the additional regulation condition is satisfied, the process proceeds to S730 to be described later in order to change the regulation mode of the air conditioner 22 to mode 3. If the additional condition is not established, the process proceeds to S710. Then, it is determined whether or not a condition for canceling the load restriction on the air conditioner 22 is satisfied.

  If it is determined in S710 that the release condition is not satisfied, the process proceeds to S700. If it is determined that the release condition is satisfied in S710, the restriction in mode 2 of the air conditioner 22 is performed in S720. After canceling, the control mode of the air conditioner 22 is switched to mode 1 by shifting to S640.

  Next, when it is determined in S680 that the restriction mode is not mode 2 (that is, when the restriction mode is mode 3), the process proceeds to S730 and the operation setting of the air conditioner 22 is adjusted. Thus, the power consumption of the air conditioner 22 is reduced by the amount of power corresponding to the regulation level “high”.

  Note that the process of S730 is also executed when it is determined in S700 that the restriction addition condition is satisfied. In this case, the restriction mode is switched from mode 2 to mode 3.

  When the power consumption of the air conditioner 22 is reduced at the restriction level “high” in S730, the process proceeds to S740, where it is determined whether the condition for releasing the load restriction on the air conditioner 22 is satisfied, and the release condition is determined. If it is determined that is not satisfied, the process of S740 is executed again to wait for the cancellation condition to be satisfied.

  If it is determined in S740 that the condition for canceling the load restriction on the air conditioner 22 is satisfied, the restriction in mode 3 of the air conditioner 22 is released in S750, and then the process proceeds to S690. The restriction mode of the device 22 is switched to mode 2.

  Thus, in the air conditioning load regulation process, the power consumption in the air conditioner 22 is set to “small”, “medium”, “large” according to the control modes 1 to 3 set according to the increase in power demand. Since the reduction is made by three kinds of reduction amounts, it is possible to prevent the power consumption in the facility from exceeding the target value to be regulated due to a rapid increase in power demand.

  Further, when the condition for canceling the load restriction on the air conditioner 22 is established, the restriction mode is changed step by step from mode 3 to mode 2 and mode 1 instead of immediately stopping the load restriction on the air conditioner 22. By releasing the load regulation, it is possible to prevent the power consumption in the air conditioner 22 from temporarily increasing and the power consumption in the facility from exceeding the target value to be regulated.

Next, the illumination load regulation process will be described.
As shown in FIG. 9, in the lighting load regulation process, it is determined in S810 whether there is a load regulation command (illumination load regulation command) for the lighting device 24. If there is no lighting load regulation command, the process again in S810. By executing the determination process, the process waits for an illumination load regulation command to be set in S320, S350, or S380 of FIG.

  If it is determined in S810 that the lighting load regulation command is set, the process proceeds to S820, and the illuminance in the facility is measured using, for example, an illuminometer (not shown), and the measurement is performed in S830. It is determined whether or not the illuminance that has been exceeded exceeds a reference value that can regulate the illuminance of the lighting device 24.

  When measuring the illuminance in the facility, it is not always necessary to use an illuminometer installed in the facility, and the power generated by the solar cell panels (PV) 34 and 44 obtained on the supply and demand management device 20 side, etc. Therefore, the illuminance in the facility that changes according to the amount of solar radiation may be estimated.

  Here, the reference value of the illuminance indicates whether the inside of the facility becomes too dark when the lighting device 24 in the facility is turned off or the illuminance of the lighting device 24 is lowered in order to reduce the power consumption of the lighting device 24. It is for judging.

  In this embodiment, if it is determined in S830 that the illuminance around the facility is equal to or less than the reference value, it is determined that a problem occurs when load regulation (illuminance regulation) of the lighting device 24 is performed. After moving to S860 and canceling the load restriction (illuminance restriction) of the lighting device 24, the process moves to S810 again.

  On the other hand, if it is determined in S830 that the illuminance around the facility exceeds the reference value, the process proceeds to S840, and the amount of current flowing through the illuminating device 24 is limited, thereby reducing the illuminance of the illuminating device 24. Regulate and reduce power consumption in the lighting device 24.

  In S840, when the illuminance regulation of the lighting device 24 is performed, all the lighting devices 24 in the facility are turned off, or the power (current) supplied to the entire lighting device 24 is reduced. However, like the load regulation of the air conditioner 22 described above, the regulated power amount may be changed in stages.

  Further, the lighting device 24 can be used for lighting equipment for illuminating the entire facility, lighting equipment for illuminating a place where a person passes in the facility, lighting equipment for illuminating a place where a person works, and so on. Different lighting devices are used depending on the situation, and each lighting device is distributed in the facility. Therefore, when the power consumption in the lighting device 24 is regulated in stages, the lighting device to be turned off is used or You may make it set according to an installation place.

  In this case, a human sensor or the like is used to detect a place where a person is present in the facility, and power is preferentially supplied to the lighting equipment at that place, and the lighting equipment at other places is turned off or the illuminance is reduced. You may make it make it.

  Next, in S850, it is determined whether a condition for canceling the load restriction on the lighting device 24 is satisfied. If the release condition is satisfied, the illuminance restriction of the lighting device 24 is released in S860, and the process proceeds to S810.

In S850, if it is determined that the condition for releasing the load restriction on the lighting device 24 is not satisfied, the process proceeds to S820, and the above-described series of processing is executed again.
As described above, in the illumination load regulation process, the illuminance in the facility is detected when the load regulation (illuminance regulation) of the lighting device 24 is performed. For this reason, by implementing illumination regulation, the inside of a facility becomes too dark and it can prevent that a malfunction generate | occur | produces.

  Next, FIG. 10 shows a supply and demand management process executed to reduce power consumption on the supply and demand management apparatus 20 side when the BEMS 10 transmits a load regulation command to the supply and demand management apparatus 20.

  As shown in FIG. 10, in this supply and demand management process, in S910, it is determined whether or not the load regulation command transmitted from the BEMS 10 has been received. If the load regulation command has not been received, the process proceeds to S990, and the load If a restriction command has been received, the process proceeds to S920.

  In S920, a discharge path to be discharged from the storage battery 38 via the DC board 30 is set based on the operating states of the DC load 32 and the AC load 42, and the DC load 32 or the AC load 42 or both from the storage battery 38 is set. To discharge.

  Next, in S930, it is determined whether or not the battery capacity of the storage battery 38 has become equal to or lower than a preset lower limit value due to discharge. If the battery capacity is equal to or lower than the lower limit value, the discharge from the storage battery 38 is terminated in S940, and then the process proceeds to S950. If the battery capacity is not equal to or lower than the lower limit value, the process proceeds to S950.

  In S950, the power consumption of the commercial power supply 2 at the load under the supply and demand management device 20 (DC board 30, AC board 40, DC load 32, AC load 42, EV charger 48, etc.) is a load regulation command from the BEMS 10. It is determined whether or not the load regulation condition by the supply and demand management device 20 is satisfied by determining whether or not the electric power is less than or equal to the predetermined electric power that is satisfied.

  In S940, the discharge from the storage battery 38 is stopped, or the discharge from the storage battery 38 started in S920 cannot be sufficiently suppressed, and it is determined in S950 that the load regulation condition is satisfied. Then, the process proceeds to S960, where the power supplied from the DC board 30 to the DC load 32, the power supplied from the AC board 40 to the AC load 42, and the EV charger 48 are limited according to a predetermined priority, and the process goes to S970. Transition. If it is determined in S950 that the load regulation condition is not satisfied, the process also proceeds to S970.

  In S970, it is determined whether or not a load regulation release command transmitted from BEMS 10 has been received. If the load regulation release command from the BEMS 10 is not received, the process proceeds to S930. If the load regulation release instruction is received from the BEMS 10, the process proceeds to S980, and the load regulation started in S960 is terminated. Then, the process proceeds to S910. In S980, when the discharge from the storage battery 38 started in S920 is continued, the discharge from the storage battery 38 is also terminated.

  Next, in S990, it is determined whether or not the forced discharge command transmitted from the BEMS 10 is received. If the forced discharge command is not received, the process proceeds to S910. If the forced discharge command is received, the process proceeds to S1000. Transition.

  In S1000, a discharge path to be discharged from the storage battery 38 via the DC board 30 is set based on the operating state of the DC load 32 and the AC load 42, and the storage battery 38 is connected to the DC load 32, the AC load 42, or both. Let the discharge occur.

  Next, in S1010, as in S930, it is determined whether or not the battery capacity of the storage battery 38 has become equal to or lower than a preset lower limit value due to discharge. If the battery capacity is equal to or lower than the lower limit value, the discharge from the storage battery 38 (forced discharge) is terminated in S1030, and then the process proceeds to S910.

  If it is determined in S1010 that the battery capacity is not equal to or lower than the lower limit value, the process proceeds to S1020, and it is determined whether or not a forced discharge release command transmitted from BEMS 10 has been received. If the forced discharge cancel command from the BEMS 10 has not been received, the process proceeds to S1010. If the forced discharge cancel command has been received, the discharge (forced discharge) of the storage battery 38 is terminated in S1030, and the process proceeds to S910. Transition.

  As described above, in the power management system of this embodiment, the BEMS 10 predicts the power demand (demand) of the load that receives power supply from the commercial power supply 2 in the facility to be managed, and the prediction result By comparing the first threshold value to the third threshold value, regulation periods T1 to T3 in which power consumption should be regulated are set.

  Further, the BEMS 10 sets a forced discharge period T4 for discharging from the storage battery 38 to the load even when the predicted value of demand is low and it is not necessary to regulate the power consumption of the load within a period when the electricity rate is high. .

  The BEMS 10 regulates the power consumption of each load in accordance with the regulation periods T1 to T3 and the forced discharge period T4 set in this way, and performs the forced discharge from the storage battery 38. In this embodiment, one of the loads In addition, a supply and demand management device 20 is provided, and the supply and demand management device 20 regulates power consumption in the subordinate load according to a command from the BEMS 10 and discharges the storage battery 38 to the load.

  For this reason, BEMS10 controls the discharge from the storage battery 38 to the supply-and-demand management apparatus 20, without controlling the discharge from the storage battery 38 directly, and suppresses the power consumption of the commercial power supply 2 by the DC load 32 and the AC load 42 be able to.

  Further, the supply and demand management device 20 sets a discharge path from the storage battery 38 or specifies a load that regulates power consumption in accordance with a command from the BEMS 10, so that when the BEMS 10 controls a load under the supply and demand management device 20. In comparison, each load can be operated efficiently while suppressing power consumption at the load under the supply and demand management device 20.

  Also, the BEMS 10 monitors the actual power consumption in the facility during the control period, and when there is a large error from the demand forecast value when the regulation plan is made, the demand forecast is performed again and forced discharge based on dynamic pricing is performed. By reviewing the regulatory plan, it is possible to more optimally manage the power demand and the electricity rate in the facility.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, a various aspect can be taken.
For example, in the above embodiment, in the air conditioning load regulation process, the regulation mode is selected according to the increase in demand power. However, for example, the regulation mode is gradually changed according to the outside air temperature. May be.

  That is, for example, when the outside air temperature is high during cooling, the regulated amount of power consumption of the air conditioner 22 is gradually increased in consideration of comfort (for example, the set temperature is increased stepwise). When the outside air temperature is low, the regulated amount of power consumption of the air conditioner 22 is increased immediately after the start of load regulation.

  In addition, for example, when the outside air temperature is low during heating, the regulated amount of power consumption of the air conditioner 22 is gradually increased in consideration of comfort (for example, the set temperature is decreased stepwise). When the outside air temperature is high, the regulated amount of power consumption of the air conditioner 22 is increased immediately after the start of load regulation.

By doing in this way, the electric power demand of the air conditioner 22 can be suppressed, without making the person in a facility feel a rapid temperature change (in other words, uncomfortable feeling).
On the other hand, in the above embodiment, the BEMS 10 has been described as merely regulating the power consumption of the load in the facility. For example, switching the on / off state of the load in the facility is also one of the regulation plans. It may be set and the load on / off state may be switched according to the set regulation plan.

  Further, in this case, the load to be switched between the on and off states is, for example, as the air conditioner 22 increases in power consumption immediately after startup and becomes stable in operation (in the case of the air conditioner 22, the air conditioning temperature is the target). In the case of a load whose power consumption decreases as the temperature approaches, the on-timing may be shifted for each load.

  That is, for example, when there are a plurality of air conditioners 22 in a facility, the period of maximum power consumption in each air conditioner 22 is prevented from overlapping by shifting the on-timing for starting each air conditioner 22. It is.

  And if it does in this way, the power consumption in the some load provided in the facility can be disperse | distributed temporally, and the peak of the power consumption in a control period can be suppressed.

  2 ... Commercial power supply, 4 ... Power line, 4a, 4b ... Branch line, 10 ... BEMS (management device), 12, 14 ... Communication path, 20 ... Supply / demand management device, 22 ... Air conditioner, 24 ... Lighting device, 30 ... DC Panel, 32 ... DC load, 34, 44 ... Solar cell panel (PV), 36, 46 ... Power conditioner (PCS), 38 ... Storage battery, 40 ... AC panel, 42 ... AC load, 48 ... EV charger.

Claims (9)

Predict the power demand of multiple loads that receive power supply from commercial power supply in the facility to be managed, and regulate the power consumption of the multiple loads within a period when the predicted result of the power demand exceeds the allowable amount A power management system comprising a management device,
A control device for controlling power supply to a specific load connected to a branch line branched from a power line from the commercial power source among the plurality of loads;
A storage battery connected to the branch line and capable of supplying power to the specific load;
With
The management device performs regulation of power consumption to the specific load by transmitting a regulation command to the control device,
The control device starts power supply from the storage battery to a specific load when the control command is received from the management device.   The management device regulates power consumption according to a preset priority for each of a plurality of loads connected to the power line, with the control device including the specific load as one load. The power management system according to 1. The management device
Based on the past power demand, the power demand in the next control period is predicted, a regulation plan for regulating the power consumption of each load according to the forecast result is made, and the power consumption of each load is regulated according to the regulation plan By controlling the power consumption of each load for each control period,
Within a control period in which the power consumption of each load is actually regulated, a prediction error of the power demand is obtained based on the measured value of the demand power of each load and a change in the surrounding environment, and the regulation based on the prediction error is obtained. Modify the plan,
The power management system according to claim 1, wherein the power management system is a power management system. The management device
Setting the allowable amount of power demand according to the dynamic pricing of the commercial power supply, and making the regulatory plan;
The power management system according to claim 3. The management device
Based on the dynamic pricing of the commercial power supply, a high charge period with a high electricity bill is detected, and when there is no need to regulate the power consumption of the load during the high charge period, the branch line or the The power management system according to claim 4, wherein the regulation plan is made so as to discharge the power line. The management device
In a control period for actually regulating the power consumption of each load, the change in the dynamic pricing of the commercial power supply is monitored, and the regulation plan is corrected based on the monitoring result.
6. The power management system according to claim 4 or 5, wherein: One of the loads that the management device regulates power consumption is an air conditioner,
The said management apparatus controls the amount of regulation according to the change of the said electric power demand, or the environmental temperature around the said facility, when regulating the electric power consumption of the said air conditioner. The power management system according to any one of 6. One of the loads that the management device regulates power consumption is a lighting device,
The said management apparatus controls the amount of regulation according to the illumination intensity in the said facility, when regulating the power consumption of the said illuminating device, The any one of Claims 1-7 characterized by the above-mentioned. Power management system. One of the loads that the management device regulates power consumption is a lighting device distributed in the facility,
The said management apparatus regulates power consumption according to the installation position of the said illuminating device, when regulating the power consumption of the said illuminating device, The any one of Claims 1-7 characterized by the above-mentioned. The power management system described in 1.

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