Method of determining demand threshold, and method and system of demand control

• US 8,311,680 B2
• Filed: 08/12/2009
• Issued: 11/13/2012
• Est. Priority Date: 12/26/2008
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Tseng, Wen-Hsiang, Lin, Cheng-Ting
• Primary Examiner(s): Ali, Mohammad
• Assistant Examiner(s): Norton, Jennifer L
• Application Number:
  US12/539,761
• Publication Number:
  US 20100168929A1
• Time in Patent Office: 1,189 Days
• Field of Search: 700/291, 700/295, 700/297, 700/22, 700/90, 123/350, 123/359, 434/430, 706/16, 708/207, 702/57, 702/61, 702/127, 702/176, 702/186, 705/7.11, 705/7.25
• US Class Current: 700/295
• CPC Class Codes: G06Q 10/06 Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
• CPC Class Codes: G06Q 50/06 Energy or water supply

Abstract

A method of setting a demand threshold is provided. A control unit arranges a plurality of demand data in a descending or an ascending order as a curve. The control unit connects a maximum demand datum and a minimum demand datum with a line. The control unit sets a demand datum with a longest perpendicular distance to the line as a demand threshold.

Claims

1. A method of determining a demand threshold, the method comprising:

a control unit arranging a plurality of demand datum in a descending or an ascending order represented by a vertical axis at equal intervals along a horizontal axis to form a curve, the demand datum related to a power consumption of an electric apparatus;

the control unit connecting a maximum demand datum and a minimum demand datum of the curve with a straight line, wherein the curve only intersects the straight line at the maximum demand datum and the minimum demand datum;

the control unit constructing and moving a perpendicular line along an entire distance of the straight line, wherein a perpendicular distance between each point on the straight line and curve is calculated to determine the perpendicular line of a longest perpendicular distance between the straight line and the curve,

the control unit setting the demand threshold as the perpendicular line of the longest perpendicular distance between the straight line and the curve;

a measuring unit measuring the demand datum related to the power consumption of the electric apparatus at an end of a time unit of a time segment, and calculating a demand of the time segment according to the measured power consumption; and

shutting down the electric apparatus when the calculated demand is greater than the demand threshold.

2. The method according to claim 1 further comprising:

the control unit checking if there is updated demand datum; and

if yes, updating the demand threshold accordingly.

3. The method according to claim 1, further comprising:

the measure unit measuring a power consumption at an end of another time unit in the time segment, and calculating another demand of the time segment according to the measured power consumption; and

shutting down another electric apparatus when the calculated demand exceeds the demand threshold.

4. The method according to claim 1, further comprising;

turning on the electric apparatus at a beginning of a time segment.

5. The method according to claim 1, wherein the time segment comprises N time units, a neglecting time comprises n time units, n≦

N, and the method further comprises;

the measure unit determining if it is the neglecting time; and

if yes, the measure unit defining a demand according to a power consumption of the neglecting time.

6. A demand control system, comprising:

a measure unit, measuring a power consumption at an end of a time unit and calculating a demand data of a time segment accordingly, wherein the time segment comprises a plurality of time units; and

a control unit, calculating a demand threshold according to a plurality of demand data, and shutting down an electric apparatus when the demand is greater than the demand threshold;

wherein the demand threshold is updated by the control unit based on a power consumption of a neglecting time in the time segment, the neglecting time including at least one of the time units; and

a power consumption of one of the time units, which is not in the neglecting time, is measured by the measure unit for calculating the demand data;

the control unit arranging a plurality of demand datum in a descending or an ascending order represented by a vertical axis at equal intervals along a horizontal axis to form a curve, the demand datum related to the power consumption of the electric apparatus;

the control unit connecting a maximum demand datum and a minimum demand datum of the curve with a straight line, wherein the curve only intersects the straight line at the maximum demand datum and the minimum demand datum;

the control unit constructing and moving a perpendicular line along an entire distance of the straight line, wherein a perpendicular distance between each point on the straight line and curve is calculated to determine the perpendicular line of a longest perpendicular distance between the straight line and the curve, and

the control unit setting the demand threshold as the perpendicular line of the longest perpendicular distance between the straight line and the curve.