JPS61231836A - Power demand controller for building equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a power demand control device for building equipment, and particularly relates to an improvement of a power demand control device that can suitably control equipment to be controlled in a building.

[Background of the invention]

Conventionally, power demand control has involved multiple technologies, as explained in Hitachi Hyoron, Vo L, 62NQ2 (February 1980), titled ``Building Air Conditioning Software for Energy Saving.''゛′Register power loads (devices to be controlled) by group,
It is known to limit the power load when an excess of power usage is predicted, according to priorities set in advance between groups or within a group.

However, the environment inside the building is not constant and should change depending on the season, weather, etc.

Therefore, it has been found that the conventional method, in which devices to be controlled can only be controlled in a pre-registered order, causes a problem in that the building environment is damaged due to demand control.

[Purpose of the invention]

An object of the present invention is to provide a power demand control device for building equipment that can reduce the deterioration of the building environment caused by power demand control.

[Summary of the invention]

A feature of the present invention is that it focuses on the fact that the necessity of window lighting changes depending on the daylight illuminance from outside the building, and the control priority of lighting equipment during demand control is switched according to the daylight illuminance. be.

[Embodiments of the invention]

In power demand control in buildings such as buildings, the objects to be controlled include lighting, air conditioners, fans, etc., but the importance of window lighting in particular changes more than the illuminance of daylight entering from outside the window.

FIG. 1 is a block diagram illustrating a power demand control device for building equipment according to the present invention.

A power receiving power meter 2 and a power receiving power meter 3 necessary for demand prediction are connected to the demand control device main body 1 as input, and daylight sensors (5 for south side) installed near the windows of the building are connected.
a and 5b) for the north side are connected. As control outputs, in addition to the lighting equipment in the building (6a to 6b for the south side, 7a to 7b for the north side), air conditioners, fans, etc. 8 to 9 are connected, and the demand control device 1 can perform start/stop control. The configuration is as follows.

The demand control device 1 uses predictive calculations to calculate available power so that the amount of power used does not exceed the maximum demand power, and if the current power usage exceeds this, load limit control is performed to reduce the power load. I do. Control at this time is performed on devices registered in advance as control targets, but
Regarding the control priority order, the priority order of lighting equipment is determined based on the daylight illuminance measured by the daylight sensor.

FIG. 2 is a schematic flowchart of demand control.

In block 1, the available power in the remaining time is calculated from the amount of power used and the demand elapsed time. In block 2,
The control priority of the demand-controlled equipment is determined based on the setting data and daylight sensor power. In block 3, the currently used power is compared with the available power calculated in block 1, and if the currently used power exceeds the available power, it is determined that load restriction is necessary and the process moves to block 4. In block 4,
According to the control priority determined in block 2, devices are sequentially stopped until the currently used power becomes less than or equal to the available power. Further, in block 3, if the currently used power is less than the available power, the process moves to block 5. Block 5
Now, it is determined whether the equipment that was stopped by demand control can be restarted. In order to prevent hunting in the control for determining whether or not it is possible to re-energize, the current power consumption is compared with the value obtained by subtracting the surplus weight from the available power, and if there is still margin, it is determined that re-charging will occur six times, and block 6 Move on to re-input control. If it is determined that re-input is not possible, re-input control is skipped and the current control state is maintained. In the load re-input control in block 6, contrary to the load stop control, only the surplus power is re-introduced in descending order of priority.

Conventionally, the priority order of the devices in block 2 is a preset order, or rotation control is performed such that the devices are controlled equally within the set group. As mentioned above, such a method does not allow flexible ranking determination according to the environment inside the building.

In this device priority determination, the present invention determines the priority of lighting devices by taking daylight illuminance conditions into consideration.

FIG. 3 shows an example of the priority order determination method of the present invention. The illuminance inside the building changes depending on the location and the weather when the building opens at 2:00.

This illuminance is measured for each zone by a daylight sensor, and the weighting coefficient for each zone is determined. In this example in Figure 3, the south zone A and the north zone
There are two types of side zone B. Also, within each zone, the daylight illuminance differs depending on the distance from the window, so the location coefficient should also be set when setting the controlled equipment.When the daylight illuminance in the south zone is X, the weighting coefficient y1 is calculated,
In this yl, each location coefficient S of the south lighting equipment, (n=1.2
．． 3...)) to determine the priority index. Do the same for the lighting in the north zone and increase the daylight illuminance x2
The weighting coefficient and location coefficient N, (n=1.2.3...
...) to determine the priority index. For equipment other than lighting equipment, a priority index is set for each equipment as shown in C. At the time of demand control, the order of these devices arranged in ascending order of priority index as shown in D is used as the control priority order.

〔Effect of the invention〕

According to the present invention, the control priority order of lighting devices during power demand control can be automatically determined to an appropriate order according to daylight illuminance, so power demand control can be performed without damaging the lighting environment. .

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the power demand control device for building equipment according to the present invention, FIG. 2 is a flowchart for explaining the demand control process of the present invention, and FIG. 3 is a method for determining equipment priority in demand control of the present invention. FIG. 1... Demand control device, 2... Power receiving electricity meter, 3
...Receiving power meter, 4...Building cross section, 5a, 5b...
・Daylight sensor, 6a, 6b, 7a,
7 b-Lighting equipment, 8-10...Low equipment (air conditioner,
fans, etc.).

Claims (1)

[Scope of Claims] 1. A building equipment having a plurality of power loads including lighting equipment, a means for monitoring the power consumption of the building equipment, and an excess of the power usage with respect to the allowable demand power amount of the building equipment. means for predicting daylight illuminance from outside the building, and in accordance with the prediction result, performs load limiting control in descending order of control priority among the plurality of electric loads, comprising: means for detecting daylight illuminance from outside the building; A power demand control device for building equipment, comprising means for determining control priority of the lighting equipment according to daylight illuminance. 2. The building equipment according to claim 1, characterized in that the lighting equipment comprises a plurality of lighting lights, and control priority is determined among the lighting lights according to the daylight illuminance. Power demand control device.