JP6730075B2 - Supervisory control device - Google Patents

Description

Embodiments of the present invention relate to a monitoring control device capable of adjusting a balance between securing an energy saving effect and suppressing an influence on operation in a well-balanced manner.

In general, the contracted power, which is the basis of the electricity rate, is negotiated between the power company and the customer according to the power used by the customer. Contract power is the largest maximum power demand in the past year, including the current month. Maximum power demand is the maximum power in a month out of the values averaged every 30 minutes. Is. In other words, the maximum value for 30 minutes determines the electricity bill for one year. When the contracted power is exceeded, the surplus power used must be a new contracted power, and there is a problem that the electricity charge increases due to the increase in the contracted power.

In response to the above problem, a consumer may introduce a monitor control device that implements a demand monitor control function. The demand monitoring control function is a function intended to prevent the power used by the load facility to be monitored and controlled from exceeding the contracted power, and can be divided into a demand monitoring function and a demand control function.

The demand monitoring function calculates an estimated power consumption, which is a predicted value of the power consumption, in a 30-minute cycle so that the power consumption of the load facility to be monitored and controlled does not exceed the contracted power. In the demand monitoring function, if the actual value of the power used by the load equipment exceeds the contracted power, or if there is a risk that the estimated power usage will exceed the alarm power, an alarm will be issued to warn consumers. Evoke.

The outline of the demand monitoring function of the monitoring control device will be described with reference to FIG. In FIG. 13, in the demand monitoring of the 30-minute cycle, the actual value of the power used by the load equipment before the current time is shown, and the predicted value of the power used by the load equipment after the current time, that is, the expected power usage is shown. The consumer presets an alarm power line below the contract power line.

In demand monitoring, when the actual value of the power used by the load equipment exceeds the contracted power line, an alarm of contracted power excess is issued. Further, in the demand monitoring, if it is assumed that the predicted value of the power consumption of the load equipment exceeds the alarm power line at the end point of the demand monitoring (30 minutes after the start of the demand monitoring), the alarm power excess alarm is issued. Is issued. It should be noted that the judgment criteria for issuing an alarm vary depending on the monitoring control device.

Next, the outline of the demand control function will be described. The demand control function is a control that, when the predicted value of power consumption exceeds alarm power, the load equipment to be monitored and controlled is sequentially stopped until the power consumption falls within the range of contract power or alarm power. It is a function. The order in which the load equipment is stopped is registered in advance in order from the lowest control level to the highest control level.

Usually, load equipment that has a small effect on operation even if stopped is registered in the low control level, and load equipment that has a large effect on operation when stopped is registered in the high control level. Therefore, load equipment that must not be stopped, such as emergency equipment and security equipment, will be excluded from the demand control targets.

Since the setting of the alarm power in the demand monitoring control function involves stopping the load equipment, the consumer may save energy by using the stop of the load equipment. FIG. 14 shows the relationship between the daily power consumption fluctuation, the contract power, and the alarm power target value. In FIG. 14, the alarm power target value is a general setting to be a value slightly smaller than the contract power (alarm power target value 1), and in order to prevent the contract power from being exceeded, the power consumption is maximized during the time zone. This means performing demand control to stop the load equipment.

In addition, by setting the alarm power target value to a value much lower than the contract power (alarm power target value 2), demand control can be performed not only during the maximum power consumption period but also during the relatively low power consumption period. It is also possible to implement energy saving promotion by stopping the load equipment that is the subject of monitoring and control. However, in the demand monitoring control function that sets the alarm power target values 1 and 2 illustrated in FIG. 14, the demand control is performed only during the time period when the power consumption exceeds the alarm power target value, and the power consumption reaches the alarm power target value. Demand control is not performed in the lower time zone. Therefore, the problem is that the time period during which energy saving is possible is limited.

For the above problem, there is a demand monitoring control function that sets different alarm power target values in each time zone of the day and enables energy saving without limiting the time zone. This is because, in the operation of the equipment to be monitored, there is a demand to save energy not only in the time period when the used power exceeds the contracted power but also in all the time periods. Regarding the control for the purpose of energy saving, it is a function that is an extension of the demand monitoring control, but from the viewpoint of the purpose, this is called energy saving control.

FIG. 15 shows the relationship between the daily power consumption fluctuation, the contracted power, and the alarm power target value (hereinafter, the target value used for the energy saving control is referred to as the energy saving target value) set differently in each time zone. FIG. 15 shows that the energy saving control can be performed in all time zones based on the energy saving target value of each time zone set in a range that will not significantly affect the operation of the facility to be monitored and controlled.

Since the energy saving target value is naturally set to a value equal to or less than the contracted power, it also prevents the contracted power from being exceeded. In the energy-saving control, the load equipment is stopped from the low level to the high level of the control level as necessary so that the energy-saving target value is not exceeded. This is the same as the demand control for the purpose of preventing the contract power excess.

JP, 2013-1888078, A JP, 2013-188079, A

The following problems have been pointed out in the conventional supervisory control devices. That is, in the conventional supervisory control device, the demand control function for preventing contractual power excess is expanded and energy saving control is possible by setting the energy saving target value in each time zone. If it becomes unexpectedly large, load equipment with a high control level will also stop. FIG. 16 shows the relationship between the expected power consumption, the actual power consumption, and the energy saving target value.

The energy-saving target value is usually set in a range (low control level, arrow a in FIG. 16) that does not seem to have a great influence on the operation with respect to the expected power consumption. However, when the power consumption of the load equipment exceeds the expected power (broken line in FIG. 16), it is necessary to suppress the power consumption higher than expected (arrow b in FIG. 16), and the load equipment with a higher control level is stopped. .. As a result, there was a problem that the influence on the operation unintentionally increased.

In other words, if the load equipment is stopped more than expected, too much to achieve the energy saving target value, the operation will be greatly affected. On the other hand, if the number of load facilities to be stopped is small and load control is insufficient in order to eliminate the influence on the operation, the energy saving effect will be reduced. As described above, it is difficult for the consumer to adjust the load suppression in a well-balanced manner between the energy saving effect and the degree of influence on the operation.

The present embodiment has been proposed to solve the above problems, and its purpose is to adjust the load suppression in a well-balanced manner between the energy saving effect and the degree of influence on the operation, thereby achieving economic efficiency and reliability. It is to provide a supervisory control device with improved performance.

In order to achieve the above-mentioned object, the embodiment of the present invention is a monitoring control device capable of implementing energy-saving control by stopping load equipment, and can set a reduction target total power amount for an arbitrary unit period, Based on the reduction target total electric energy, the energy saving target value used for energy saving control can be set in each time zone of the day, and the predicted value of the power consumption of the load equipment in each time zone. And a difference calculation unit capable of calculating the difference between the expected power consumption and the actual demand load of the load facility in an arbitrary time zone, and the time at which the difference is obtained. And a correction unit capable of correcting the energy saving target value by adding or subtracting the difference to or from the energy saving target value in the time zone next to the band .

The block diagram which shows the structure of a typical embodiment. The graph for explaining the expected power consumption of the load facility. The graph which shows the example of setting of an energy saving target value. The graph which shows the example of setting of an energy saving target value. The graph which shows an example of each calculation method when unit time per day is divided into 24 pieces. Table 1 which shows an example of the calculation result of each calculation method of an energy saving target value. The graph which shows the image when the actual load demand is large with respect to the power consumption forecast. The graph which shows the image of correction of the energy saving target value. The graph which shows the image of correction of the energy saving target value. The graph which shows the image of correction of the energy saving target value. The graph which shows the image of correction of the energy saving target value. The graph which shows the example of setting of the energy saving target value in other embodiment. The graph for explaining the outline of the demand monitoring function. The graph which shows the relationship between power consumption fluctuation, contract power, and alarm power target value. The graph which shows the relationship between power consumption fluctuation, contract power, and the alarm power target value set differently in each time zone. The graph which shows the relationship between expected power consumption, actual power consumption, and energy saving target value.

(1) Embodiment [Configuration]
The configuration of a representative embodiment of the present invention is shown with reference to the block diagram of FIG. The monitoring control device 1 according to the present embodiment is a device in which the load facilities a1 to an are subjected to monitoring control. The monitoring control device 1 is a device that can perform demand monitoring control for the purpose of preventing contract power excess and energy saving control by stopping the load facilities a1 to an.

Therefore, the monitoring control device 1 includes a setting input unit 7 capable of setting two types of target values, an alarm power target value for contract power excess prevention control and an energy saving target value for energy saving control. The setting input unit 7 can set the energy saving target value for each predetermined time period.

The monitoring control device 1 can use the function for realizing the demand monitoring control and the function for realizing the energy saving control as one function, or can use the energy saving control function alone. To do. In the following description, the case where the monitor control device 1 uses the energy saving control function alone will be described.

In the monitoring control device 1, the network N is connected and arranged with input/output units b1 to bn. The input/output units b1 to bn send and receive various signals to and from the load facilities a1 to an that are the monitoring control targets. For example, the input/output units b1 to bn receive status signals from the load equipments a1 to an and send control signals to the load equipments a1 to an.

The status signals that the input/output units b1 to bn receive from the load equipments a1 to an are digital values or analog values of the operation status data of the load equipments a1 to an that are the result of the control of the load equipments a1 to an. The control signals sent from the input/output units b1 to bn to the load equipments a1 to an include digital values such as on/off of the load equipments a1 to an and analog values such as temperature setting and illuminance setting. In the monitoring control device 1, the input/output units b1 to bn output these control signals to the load equipments a1 to an to control the load equipments a1 to an.

Further, in the supervisory control device 1, the input unit 2 is connected and arranged in the network N. The input unit 2 takes in the received power or the amount of received power, that is, how much power is being purchased from a power company from the power receiving equipment c. The input unit 2 takes in weather observation data such as temperature and humidity from the weather observation equipment d. The meteorological observation data is one of the data used to calculate the expected power consumption of the load facilities a1 to an in each time zone of the day.

Further, the monitoring control device 1 includes a display/report output unit 3, a storage unit 4, an external information input unit 5, a probability calculation unit 6, a setting input unit 7, a difference calculation unit 8, and a correction unit 9 in the network N. It is connected. Of these, the display/report output unit 3 is an output device that graphically displays the status of energy saving control and the operating status of the load equipment a1 to an. The storage unit 4 is a storage device that saves various settings and accumulates a control operation history in the monitoring control device 1. The external information input unit 5 is an input device that performs an input process for information from the outside of the monitoring control device 1 such as a weather forecast.

The estimation calculation unit 6 can calculate the estimation of power consumption of the load equipments a1 to an in each time zone of the day. The estimated power consumption of the load equipments a1 to an will be described with reference to the graph of FIG. In the graph of FIG. 2, the horizontal axis represents time (h), the vertical axis represents power consumption (kW), and the total expected power amount of the load equipments a1 to an can be calculated by the product of the horizontal axis and the vertical axis. .. The shaded portion in FIG. 2 corresponds to the total expected power amount of the load equipments a1 to an.

Various existing methods can be applied as the calculation method of the estimated power consumption of the load facilities a1 to an in the estimation calculation unit 6. Specifically, a method of making a human judgment based on the past actual value, a method of automatically reflecting the actual value of the total load power (that is, received power) on the same day or the same day in the past, or pattern matching and so on.

Pattern matching is the total load power stored by accumulating actual parameter values of meteorological observation data (temperature, humidity, etc.) together with past total load power, and linking past data of similar weather values from the weather forecast data of the next day. It is a method of reflecting the actual value of. Furthermore, a method of calculating the actual value of the total load power by various algorithms from the weather forecast data is also known.

The setting input unit 7 presets the reduction target total electric energy in an arbitrary unit period, for example, a period such as one day or one month, and based on this reduction target total electric energy, Allows setting of energy saving target values. The reduction target total power amount is a value obtained by multiplying the total expected power amount in an arbitrary unit period by a predetermined reduction percentage number. Further, the setting input unit 7 can set the energy-saving target value for each time zone with respect to the expected power consumption of the load facilities a1 to an on the next day at the time of the previous day.

The difference calculation unit 8 is configured to obtain the difference between the expected power consumption of the load equipment a1 to an and the actual demand load. The difference calculation unit 8 can obtain the actual demand load by adding the energy saving target value and the load suppression amount due to the stop of the load facilities a1 to an. Further, as described above, the estimated power consumption of the load equipments a1 to an is calculated by the estimation calculation unit 6, so the difference calculation unit 8 takes in this and calculates the difference from the actual demand load of the load equipments a1 to an. It is possible to ask.

The correction unit 9 can correct the energy-saving target value by taking in the difference by the difference calculation unit 8 and adding or subtracting the difference to or from the energy-saving target value in the time zone next to the time zone when the difference is obtained. And The correction unit 9 can correct the energy-saving target value by adjusting the difference calculated by the difference calculation unit 8 with respect to the energy-saving target value in the next time zone as follows.

That is, the correction unit 9 compares the estimated power consumption obtained on the previous day with the actual demand load of the current day, and when the demand load of the current day is smaller than the estimated power consumption of the current day, the correction unit 9 calculates the difference. The energy saving target value is corrected by subtracting the difference obtained by the unit 8 from the energy saving target value in the next time zone. On the other hand, when the demand load of the day is larger than the estimated power consumption, the correction unit 9 adds the difference calculated by the difference calculation unit 8 to the energy saving target value in the next time zone, thereby saving the energy saving target. Correct the value.

Further, it is assumed that the corrected load suppression amount due to the stop of the load facilities a1 to an after the correction of the energy saving target value becomes the same value as the energy saving reduction target, which is a value obtained by subtracting the energy saving target value from the expected power usage. In this case, the correction unit 9 makes it possible to correct the energy-saving target value after correction again by subtracting the amount of power for the energy-saving reduction target in the time zone from the energy-saving target value after correction in the next time zone.

[Action]
(Setting of energy saving target value)
In the present embodiment having the above configuration, the setting input unit 7 sets the energy saving target value as follows. The setting input unit 7 first sets the reduction target total electric energy in an arbitrary unit period, for example, a period such as one day or one month. Then, the setting input unit 7 divides the reduction target total electric energy by the number of unit hours per day for setting the energy saving target value, that is, 48 for 30 minutes and 24 for 1 hour, and Calculate and set the energy saving target value in time.

Samples when the setting input unit 7 sets the energy saving target value are shown in FIGS. In FIG. 3 and FIG. 4, the unit time per day is divided into 48 pieces in 30-minute units, and the graphs shown by the curves show the power usage prospects of the load equipments a1 to an, and have a step-like shape. The graph shows the energy saving target value. In FIG. 5, the unit time per day is divided into 24 units in units of one hour. FIG. 6 shows a calculation sample of each method of setting the energy saving target value in Table 1.

In the example shown in FIG. 3, the setting input unit 7 sets the energy saving target value by subtracting the same value from the estimated power consumption for each time period. For this reason, the curve of the graph showing the expected power consumption and the curve of the graph showing the energy saving target value have the same gradient, except that the latter is stepwise. The calculation method when setting such an energy saving target value is referred to as “calculation method 1” (see Table 1 in FIG. 6).

In the example shown in FIG. 4, the setting input unit 7 sets the energy-saving target value in a time zone that is equal to or less than the minimum expected power (for example, 10 kW) preset for the estimated power consumption to 0, and uses it in the remaining time zones. Subtract the minimum expected power from the expected power (column A in the table of FIG. 6). Then, after multiplying that value by the same ratio (column B in the table of FIG. 6), the minimum estimated power is added in all time zones, and the sum of these is the total estimated power amount after reduction. In this way, the energy saving target value for each time period is set by performing a regression calculation while changing the% number. The calculation method for setting the energy saving target value in this manner is referred to as “calculation method 3”.

In Table 1 shown in FIG. 6, the energy saving target value is set to 0 in the time zones of 0:00, 1:00 and 23:00. That is, in this time period, as shown in the graphs of FIGS. 4 and 5, the graph showing the estimated power consumption and the graph showing the energy saving target value are in agreement. Further, as shown in FIG. 4 and FIG. 5, when the energy saving target value is derived by the “calculation method 3”, the difference between the expected power usage and the energy saving target value becomes large in a portion where the expected power consumption is large, and The peak of the energy saving target value is lower than the peak of the energy saving target value in the "calculation method 1" shown in the graph.

Although not shown in the graph in which the number of unit hours per day is divided into 48, the setting input unit 7 may set the energy saving target value by multiplying the estimated power consumption by the same ratio. The calculation method when setting the energy saving target value is referred to as “calculation method 2”. In addition to the graphs of "calculation method 1" and "calculation method 3", FIG. 5 also shows a graph of "calculation method 2".

As shown in Table 1 of FIG. 6, the total expected electric energy is 1090 kW, and the reduction target total electric energy that is the set value is 218 kW. Therefore, the total expected power after reduction is 1090-218=872kW. In the present embodiment, whichever of the “calculation methods 1 to 3” is adopted, the energy saving target value for each time zone is determined based on the reduction target total electric energy of 218 kW.

For example, in "calculation method 1," 9.1 kW, which is a value obtained by dividing the reduction target total electric power amount of 218 kW by 24, is a reduction target output for each hour, that is, a common value subtracted from the power consumption estimate. In the "calculation method 2," 20%, which is a value obtained by dividing the reduction target total electric energy of 218 kW by the total expected electric energy of 1090 kW, is the reduction target% for each hour, that is, the ratio of the power consumption expected. Further, in "calculation method 3", 25.7% is the reduction target% for each hour.

(Correction of energy saving target value)
As described above, the setting input unit 7 sets the energy-saving target value for each time zone with respect to the estimated power usage of the load facilities a1 to an on the next day at the time of the previous day. However, the energy saving target value for each time period set by the setting input unit 7 is the value set at the time of the previous day, so the next day of the set day, that is, the demand situation of the load facilities a1 to an of the day and the estimated power consumption of the previous day. And do not always match.

Therefore, in the monitoring control device 1 according to the present embodiment, the correction unit 9 corrects the energy saving target value in anticipation that the demand situation of the load equipments a1 to an on the current day and the expected power consumption on the previous day are different. The correction of the energy saving target value by the correction unit 9 will be specifically described with reference to the graphs of FIGS. 7 to 11.

In the graphs of FIGS. 7 to 11, the broken line indicates the power consumption of the load facilities a1 to an when the load is not suppressed by stopping the load facilities a1 to an, and the solid line indicates the estimated power consumption of the load facilities a1 to an and the staircase shape. The solid line indicates the energy-saving target value in each time period, and the alternate long and short dash line overlapping the stepwise solid line indicates the actual power consumption of the load equipments a1 to an when the energy-saving control is performed.

In FIGS. 8 to 11, arrows A to G in the graph indicate the next electric energy. That is, A is the estimated power consumption of the load facilities a1 to an, B is the energy saving target value, and C is the load suppression amount due to the stop of the load facilities a1 to an. D is the power used (that is, the actual demand load) when the load facilities a1 to an are not stopped and the load is not suppressed, and E is the difference between the power consumption estimate A and the actual demand load D. F is the amount of electric power that is the energy saving reduction target obtained by subtracting the energy saving target value B from the expected power consumption A.

The estimated power consumption A is calculated by the estimation calculation unit 6 and stored in the storage unit 4. The energy saving target value B is set by the setting input unit 7 and stored in the storage unit 4. The load suppression amount C is the amount of electric power derived from the result of actually suppressing the load equipments a1 to an to achieve the energy saving target value B in the time zone, and the power consumption of the load equipments a1 to an in the time zone. It can be calculated backward from the quantity.

The power consumption when the load is not suppressed, that is, the actual demand load D is obtained by adding the energy saving target value B and the load suppression amount C in the relevant time zone (D=B+C). The difference E is a difference between the actual demand load D and the expected power usage A. These D and E are obtained by the difference calculation unit 8. The energy-saving reduction target F is the amount of power obtained by subtracting the energy-saving target value B from the expected power consumption A, and is set by the setting input unit 7 and stored in the storage unit 4.

<a> When the actual demand load is larger than the estimated power consumption The energy saving target value B is set on the previous day, even though the demand load D for the current day is greater than the estimated power consumption A obtained the previous day. If it is operated as it is, the load facilities a1 to an are stopped more than expected, and the degree of influence on the operation becomes large. Therefore, it is necessary to prevent the load facilities a1 to an from being stopped more than expected, and the correction unit 9 corrects the initial energy-saving target value B so as to increase it.

The graph of FIG. 7 shows an image when the power usage (broken line) when the load is not suppressed, that is, the actual demand load of the day is larger than the power usage prospect (solid line). For example, as shown in the time zone from 7:00 to 30 in FIG. 8, when the actual load demand D is larger than the estimated power usage A, the difference calculation unit 8 calculates the actual demand load D from the actual demand load D. By subtracting the estimated power consumption A, the difference E between the two is obtained (E=DA).

When the actual demand load D is larger than the estimated power consumption A (A<D), the correction unit 9 calculates the difference E calculated by the difference calculation unit 8 in the relevant time zone in the next unit time zone. The energy saving target value is corrected by adding it to the initial energy saving target value B. That is, the corrected energy-saving target value is the sum of the energy-saving target value B and the difference E in the time period when the difference E is obtained (B+E).

The correction unit 9 repeats the correction of the energy saving target value by repeating such calculation every unit time period. In the graph of FIG. 9, the corrected energy saving target value is indicated by a stepwise slightly thick solid line. In FIG. 9, a value obtained by subtracting the corrected energy saving target value (B+E) from the power consumption (actual demand load) D when the load is not suppressed is set as the corrected load suppression amount C1.

Thus, the corrected energy-saving target value (B+E) is a value that is increased by a difference E from the initial energy-saving target value B, and the corrected load suppression amount C1 is greater than the initial load suppression amount C. Is reduced by the difference E. As a result of the corrected load suppression amount C1 becoming smaller, it becomes unnecessary to stop the load equipments a1 to an more than expected, and the degree of influence on operation can be suppressed.

<b> Recorrection of corrected energy saving target value The corrected load suppression amount C1 is the difference between the actual demand load D and the corrected energy saving target value (B+E). At this time, if the actual demand load D becomes smaller and the difference from the corrected energy saving target value (B+E) becomes smaller, the corrected load suppression amount C1 becomes smaller. That is, the number of load equipments a1 to an is reduced, and it becomes difficult to achieve the energy saving reduction target F.

Therefore, in the correction unit 9 of the present embodiment, when the corrected load suppression amount C1 has the same value as the energy saving reduction target F, the corrected load suppression amount C1 is increased again so as to be increased. Correct the energy saving target value (B+E). For example, assume that the corrected load suppression amount C1 and the energy saving reduction target F have the same value in the time zone from 16:00 to 16:30 in the graph of FIG.

In this case, the correction unit 9 adjusts the power consumption amount of the energy saving reduction target F in the time zone in the next time zone, that is, from 16:30 to 17:00 in the corrected energy saving target value (B+E). ) To make the energy-saving target value after re-correction (shown by the bold line). By such recorrection of the energy saving target value, the load suppression amount C2 after recorrection exceeds the energy saving reduction target F′ in the next time zone. As a result, it is possible to suppress the number of load facilities a1-an that are stopped and enhance the energy saving effect. As a result, the initial energy saving reduction target F′ can be reliably achieved.

When the actual load demand is smaller than the estimated power consumption It is possible that the actual demand load is smaller than the estimated power consumption obtained the day before. In this case, if the energy saving target value is set and set on the previous day, the number of the load facilities a1 to an that continue to operate without stopping increases, and there is a problem that the energy saving effect cannot be obtained.

Therefore, if the actual demand load is smaller than the expected power consumption, it is required to increase the number of stopped load facilities a1 to an. In order to meet this request, the correction unit 9 corrects the energy saving target value so as to be low. The correction of the energy saving target value by the correction unit 9 will be described with reference to the graph of FIG.

The graph of FIG. 11 shows an image when the power consumption when the load control is not performed, that is, the actual demand load is smaller than the expected power consumption. As shown in the time period from 7:00 to 30 minutes in FIG. 11, when the actual load demand D is smaller than the estimated power usage A, the difference calculation unit 8 calculates the actual consumed power A from the estimated power usage A. The difference E between the two is obtained by subtracting the demand load D of (E=A−D).

When the actual demand load D is smaller than the estimated power consumption A (A>D), the correction unit 9 calculates the difference E obtained by the difference calculation unit 8 in the relevant time zone as the next unit time. The energy-saving target value is corrected by subtracting it from the initial energy-saving target value B′ of the band. That is, the corrected energy-saving target value is (B′−E) obtained by subtracting the difference E from the initial energy-saving target value B′.

The correction unit 9 repeats these calculations every unit time period to repeat the correction of the energy saving target value. In the graph of FIG. 11, the corrected energy-saving target value is indicated by a stepwise slightly thick solid line. In the time period from 7:30 to 8:00 in FIG. 11, the corrected energy saving target value (B′-E) is calculated from the power consumption (actual demand load) D′ when the load is not suppressed. The subtracted value is the corrected load suppression amount C3.

As described above, the corrected energy-saving target value (B′−E) is a value that is reduced from the initial energy-saving target value B′ by the difference E, and the corrected load suppression amount C3 is the initial load. It is larger than the suppression amount C by the difference E. The increase in the corrected load suppression amount C3 means that the number of stopped load facilities a1 to an has increased, and the energy saving effect can be improved.

[effect]
[1] As described above, in the monitoring control device 1 according to the present embodiment, the energy saving target for each time zone of the day is based on the reduction target total power amount preset in an arbitrary unit period. It is provided with a setting input unit 7 capable of setting a value. Therefore, the setting input unit 7 can set the energy saving target value while considering the degree of influence on the operation based on the reduction target total electric energy in any unit period. As a result, it is possible to avoid an unexpected stoppage of the load equipment, and it is possible to accurately eliminate the influence on the operation.

Further, since the energy saving target value is set on the basis of the reduction target total power amount, the reduction target total power amount can be reliably ensured, and the desired energy saving effect can be obtained. According to the present embodiment as described above, it is possible to realize a well-balanced load suppression between the energy saving effect and the degree of influence on the operation, and it is possible to contribute to the improvement of economic efficiency and reliability. ..

[2] In addition, in the present embodiment, an estimation calculation unit 6 that can calculate the estimated power consumption of the load equipment in each time zone is provided, and the setting input unit 7 adopts the “calculation method 1” and uses it. The target value can be set by subtracting the same value from the power forecast. Therefore, the setting input unit 7 uniformly sets the energy saving target value stably throughout the day. The monitoring control device 1 including the setting input unit 7 that adopts the "calculation method 1" is particularly effective when the load facilities a1 to an are operating uniformly for 24 hours.

[3] In the present embodiment, the estimated power consumption of the load equipment in each time zone can be calculated, and the setting input unit 7 adopts “calculation method 2” to estimate the consumed power. The energy saving target value can be set by multiplying by the same ratio. Therefore, the setting input unit 7 can change and set the magnitude of the energy saving target value according to the magnitude of the expected power consumption. Therefore, the energy saving target value can be set more flexibly, and the balance between the energy saving effect and the degree of influence on operation can be easily adjusted.

[4] In the present embodiment, the setting input unit 7 adopts “calculation method 3” to set the energy saving target value in the time zone indicating the lowest value of the estimated power consumption to 0, and the power consumption in each of the remaining time zones. The target value can be set by subtracting the minimum expected power from the estimate, multiplying by the same ratio, and then adding the minimum expected power. According to such a setting input unit 7, since the energy saving target value in the time zone showing the lowest value of the estimated power consumption is set to 0, the load facilities a1 to an can be stopped in the time zone in which the estimated power consumption is low. Therefore, it is possible to accurately exclude the influence on the operation.

[5] In the present embodiment, the difference calculation unit 8 that can calculate the difference between the expected power consumption in an arbitrary time zone and the actual usage demand load of the load facilities a1 to an, and the difference calculation unit 8 calculates the difference. The correction unit 9 is capable of correcting the energy-saving target value by adding or subtracting the difference to the energy-saving target value in the time zone next to the predetermined time zone.

According to the present embodiment as described above, when the demand situation of the load facilities a1 to an on the current day does not match the power usage prospect obtained on the previous day, the demand situation of the load facilities a1 to an of the day is determined. In addition, it is possible to correct the energy saving target value. That is, when the demand load on the day is smaller than the power consumption forecast calculated on the previous day, the demanded power on the day is small, but even if the number of stopped load equipments a1 to an is increased, The effect is hard to come out. Therefore, the correction unit 9 can perform correction so as to reduce the energy-saving target value and increase the number of stopped load facilities a1 to an to enhance the energy-saving effect.

On the contrary, when the demand load on the day is larger than the expected power consumption obtained on the previous day, there is a concern that the load equipments a1 to an will stop more than expected, and the operation is likely to be affected. Therefore, the correction unit 9 corrects the energy saving target value so as to increase it, avoids the load equipments a1 to an from stopping more than expected, and suppresses the degree of influence on the operation.

Moreover, in the correction unit 9 of the present embodiment, when the demand load of the day is large with respect to the estimated power consumption obtained on the previous day, when the corrected load suppression amount and the energy saving reduction target become the same value, The corrected energy saving target value is corrected again so that the amount of the energy saving reduction target in the time period is reduced from the corrected energy saving target value in the next time period. As a result, the load suppression amount after recorrection becomes larger than the energy saving reduction target, the energy saving reduction target can be reliably achieved, and an excellent energy saving effect can be secured.

[6] In the present embodiment, the setting input unit 7 can set two types of target values, that is, an alarm power target value for contract power excess prevention control and an energy saving target value for energy saving control. Therefore, it is possible to perform both the demand monitoring control for the purpose of preventing the contract power excess and the energy saving control by stopping the load facilities a1 to an. Furthermore, since the setting input unit 7 can set the energy-saving target value for energy-saving control for each predetermined time period, an excellent energy-saving effect can be obtained.

(2) Other Embodiments The above embodiments are presented as examples in the present specification, and are not intended to limit the scope of the invention. That is, the invention can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. The embodiments and the modifications thereof are included in the scope of the invention and the scope of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.

[a] For example, the setting input unit 7 sets the energy-saving target value in a time period in which the estimated power consumption is equal to or less than the preset minimum estimated power to 0, and subtracts the same value from the estimated power consumption in each remaining time period. Therefore, the energy saving target value may be set, or the energy saving target value may be set by multiplying the estimated power consumption in each of the remaining time zones by the same ratio. According to the setting input unit 7 as described above, like the setting input unit 7 that employs the above-described “calculation method 3,” the load facilities a1 to an are operated without being stopped during a time period when the expected power consumption is low. It is possible to accurately exclude the effect on the.

[b] The setting input unit 7 may be configured to be able to set a time period in which the energy saving control is performed. For example, in the graph of FIG. 12, the energy saving target value can be set in the time zone from 18:00 to 18:00. According to the setting input unit 7 as described above, the time period in which the energy saving control is performed can be set, so that the time period in which the energy saving control is performed can be freely selected. Therefore, even if the time period when the expected power consumption is low fluctuates, it is possible to immediately cope with it. As a result, it is possible to reliably suppress the number of load facilities a1 to ann that are stopped, and to reliably eliminate the influence on the operation.

[c] A mode setting unit may be provided that can selectively set a maintenance priority mode for maintaining the energy saving target value at the initial setting or a correction priority mode for correcting the energy saving target value. In such an embodiment, when the mode setting unit selects the maintenance priority mode, the energy saving target value is not corrected and the next time zone is controlled with the original energy saving target value.

For example, if it is assumed that the forecast accuracy of power consumption is high and the error between the power consumption forecast and the actual load demand is small, it is better to maintain the energy saving target value rather than considering the effect of changing the energy saving target value. However, it can contribute to the stabilization of operation. On the other hand, when the mode setting unit selects the correction priority mode, the energy saving target value is corrected, so that the energy saving target value is optimized. This mode is particularly effective when it is difficult to predict the expected power consumption and the error from the actual load demand is likely to increase.

[d] The unit period for obtaining the reduction target total electric energy can be set as appropriate, and may be a long unit period such as a season or a year, or a short unit period such as a half day or an hour. Good. Also, regarding the specific value of the reduction target total power consumption, the magnitude of the set power consumption depends on the scale of the load facility to be monitored, the degree of impact on the stabilization of operation, the required energy saving effect, etc. Therefore, it can be changed appropriately.

[e] The correction unit 9 may be able to set a time period in which the energy saving target value is corrected. For example, regarding the correction of the energy saving target value, the time period in which the correction is performed may be set in consideration of the time period in which the suppression of the load facility reduces the work efficiency.

DESCRIPTION OF SYMBOLS 1... Monitoring/control device 2... Input part 3... Display/report output part 4... Storage part 5... External information input part 6... Prospect calculation part 7... Setting input part 8... Difference calculation part 9... Correction parts a1-an... Load equipment b1 to bn... Input/output section c... Power receiving equipment d... Meteorological observation equipment N... Network

Claims (11)

It is a monitoring control device that can perform energy saving control by stopping load equipment, can set a reduction target total power amount for an arbitrary unit period, and based on the reduction target total power amount, an energy saving target value used for energy saving control. And a setting input section that can be set at each time of day,
An estimation calculation unit capable of calculating an estimated power consumption that is a predicted value of the power consumption of the load equipment in each of the time zones,
A difference calculation unit capable of calculating the difference between the expected power consumption and the actual demand load of the load facility in an arbitrary time zone,
A correction unit capable of correcting the energy saving target value by adding or subtracting the difference to or from the energy saving target value in a time zone next to the time zone in which the difference is obtained,
Monitoring and control device equipped with. The monitoring control device according to claim 1, wherein the setting input unit can set the energy saving target value by subtracting the same value from the expected power consumption. The setting input unit sets the energy saving target value to 0 in a time period in which the estimated power consumption is equal to or less than a preset minimum estimated power, and subtracts the same value from the estimated power consumption in each of the remaining time periods. The monitoring control device according to claim 2, wherein the energy saving target value can be set. The monitoring control device according to claim 1, wherein the setting input unit can set the energy-saving target value by multiplying the expected power consumption by the same ratio. The setting input unit sets the energy-saving target value in a time period that is equal to or less than the minimum expected power preset for the estimated power consumption to 0, and multiplies the estimated power consumption in each remaining time period by the same ratio. The monitoring control device according to claim 4, wherein an energy saving target value can be set. The setting input unit makes it possible to set the energy saving target value by subtracting the minimum estimated power from the estimated used power in each of the remaining time zones, multiplying by the same ratio, and further adding the minimum estimated power. The monitoring control device according to claim 5. The monitoring control device according to claim 1, wherein the setting input unit can set a time period in which the energy saving control is performed. The correction unit, when the load suppression amount due to the stop of the load equipment after correcting the energy-saving target value is the same value as the energy-saving reduction target which is a value obtained by subtracting the energy-saving target value from the expected power consumption, in the time zone The monitoring control device according to claim 1, wherein the corrected energy saving target value can be corrected again by subtracting the energy saving reduction target amount from the corrected energy saving target value in the next time zone. .. The monitoring control according to any one of claims 1 to 8, further comprising a mode setting unit configured to selectively set a maintenance priority mode for maintaining the energy saving target value or a correction priority mode for correcting the energy saving target value. apparatus. A monitoring control device capable of performing contract power excess prevention control and energy saving control by stopping load equipment,
A setting input unit capable of setting two kinds of target values, that is , an alarm power target value for contract power excess prevention control and an energy saving target value for energy saving control in each time zone of the day ,
An estimation calculation unit capable of calculating an estimated power consumption that is a predicted value of the power consumption of the load equipment in each of the time zones,
A difference calculation unit capable of calculating the difference between the expected power consumption and the actual demand load of the load facility in an arbitrary time zone,
A correction unit capable of correcting the energy saving target value by adding or subtracting the difference to or from the energy saving target value in a time zone next to the time zone in which the difference is obtained,
Monitoring and control device equipped with. A monitoring control device capable of implementing energy-saving control by stopping load equipment,
A setting input unit that can set an energy saving target value for energy saving control for each predetermined time period,
An estimation calculation unit capable of calculating an estimated power consumption that is a predicted value of the power consumption of the load equipment in each of the time zones,
A difference calculation unit capable of calculating the difference between the expected power consumption and the actual demand load of the load facility in an arbitrary time zone,
A correction unit capable of correcting the energy saving target value by adding or subtracting the difference to or from the energy saving target value in a time zone next to the time zone in which the difference is obtained,
Monitoring and control device equipped with.

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