KR20160027710A - Energy management device - Google Patents
Energy management device Download PDFInfo
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- KR20160027710A KR20160027710A KR1020140116148A KR20140116148A KR20160027710A KR 20160027710 A KR20160027710 A KR 20160027710A KR 1020140116148 A KR1020140116148 A KR 1020140116148A KR 20140116148 A KR20140116148 A KR 20140116148A KR 20160027710 A KR20160027710 A KR 20160027710A
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- power
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- capacitors
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/70—Regulating power factor; Regulating reactive current or power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
Abstract
Description
The present invention relates to an energy management apparatus, and more particularly, to an energy management apparatus that receives input power and acquires power consumption information in real time, measures a maximum power information and predicts estimated maximum power information on a divided basis, And a load controller for receiving the information and adjusting the capacity of the capacitors according to the power factor state to switch the charging or unloading of the capacitors to the loads, thereby improving the power factor of the loads.
The power supply system used in the conventional home is not a distributed power supply but a central power supply. It is a vertical and centralized network system controlled by the producer and uses unidirectional communication for data transmission.
Recently, there is a growing interest in using energy efficiently as an alternative to high oil prices and energy shortages. Energy Management System (EMS) has been introduced as an alternative to efficient use of energy in homes or facilities.
The energy management system is a device that systematically improves the energy efficiency by reducing unnecessary energy wastage. Since it adopts bidirectional communication as a basic system, it can monitor not only the amount of electricity of home appliances but also the operation information in real time.
Also, the energy management device may include a function of controlling the home appliance itself, so that the energy management device automatically controls the energy consumption of the home appliance to prevent unnecessary energy wastage.
On the other hand, in order to reduce the effective electricity rate in a building or facility, it is consumed by a plurality of loads in the building or facility so as not to exceed the peak power determined by building or facility unit, There is a demand for an energy management device capable of reducing the power factor rate by improving the power factor of the load and the method of controlling the amount of power being supplied.
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a power management apparatus and a power management method thereof, which are capable of obtaining power consumption information in real time by receiving input power, And a load control unit for adjusting the capacity of the capacitors according to the power factor state to switch the charging or discharging of the capacitors to the loads, thereby improving the power factor of the loads.
According to an aspect of the present invention, there is provided an energy management apparatus connected physically between an input power source and an output power source and connected to loads to manage the loads, the energy management apparatus comprising: A power management unit for acquiring power usage information, estimating maximum power information on a divided basis, and estimating expected maximum power information; A load controller for receiving the measured power factor information and adjusting the capacitance of the capacitors according to the power factor state to switch the charging or unloading of the capacitors to the loads to improve the power factor of the loads; An input / output unit for transmitting to the load control unit a control signal for switching whether to open or close the capacitors according to the power factor state; A communication unit for performing wired, wireless or internet communication with an external device; And a central processing unit for controlling the power management unit, the load control unit, the input / output unit, and the communication unit.
The present invention has the technical effect of drastically reducing electric charges including improvement of electric power quality, base fee, usage fee and power factor rate.
1 shows a general physical connection configuration of an energy management apparatus according to the present invention.
2A shows a configuration of an energy management apparatus according to the present invention.
FIG. 2B is a view for explaining the connection configuration and functions of the energy management apparatus according to an embodiment of the present invention.
3 is a graph illustrating a method of measuring and predicting a maximum power value by the maximum power management unit according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating a load management method by a load control unit according to an embodiment of the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 shows a general physical connection configuration of an energy management apparatus according to the present invention.
1, an
FIG. 2A illustrates a configuration of an energy management apparatus according to the present invention, and FIG. 2B illustrates an exemplary configuration and function of an energy management apparatus according to an exemplary embodiment of the present invention.
2A, an
Hereinafter, with reference to FIG. 2A and FIG. 2B, the connection structure and functions of the
The
In this case, the
The maximum
The
In this case, the converting
The inverting unit 122 converts the DC voltage output from the converting
At this time, the inverting unit 122 controls the rotation speed of the load (such as a motor, a pump, a fan, etc.) by varying the voltage and frequency of the AC power supply to the
Where N is the rotational speed of the motor, p is the number of motor poles, f is the frequency, and s is the slip.
Referring to Equation (1), the rotation speed N of the motor can be controlled by adjusting the frequency f. If the frequency f is changed from 50 Hz to 50 Hz, the rotation speed N of the motor is about 17 %, So that the power consumption can be reduced.
For example, when the rotation speed (N) of the motor is reduced by 10%, the power consumption is reduced by 27%. When the rotation speed (N) is reduced by 20%, the power consumption can be reduced by 49% and the average power consumption can be reduced by about 34%.
The
When the
The
The
The input /
The
The
The
3 is a graph illustrating a method of measuring and predicting a maximum power value by the maximum power management unit according to an embodiment of the present invention.
Hereinafter, a method of measuring and predicting the maximum power value by the maximum
First, as shown in FIG. 3, the current demand power value can be calculated as the current demand power value / time variation based on the reference power value (for example, the current demand power value at the seventh minute is the demand power And the maximum power value is measured in terms of the used power dP / elapsed time dt, that is, the slope is the maximum value, and is generated in units of 15 minutes, and the generated maximum power value is transmitted through the
On the other hand, the minute measurement cycle can be arbitrarily set by the user, for example, 1 minute / 5 minutes / 15 minutes / 30 minutes / 60 minutes, and in the case of the present invention, the demand power measurement cycle is set to 15 minutes.
The 15-minute maximum peak prediction for the future based on the current demand time (15 minutes) is based on only the 15-minute maximum power and the current maximum power.
For the other systems, the maximum peak pattern for the next 15 minutes is predicted through the maximum peak pattern for 1 hour or 1 day. In the 15-minute prediction for the future, it is meaningless to manage the daily use pattern or the peak peak pattern for the immediately preceding 1 hour. The next 15-minute maximum peak is predicted based on the current peak, and the last 15-minute data required for the maximum peak prediction at the elapse of 15 minutes is reset and predicted.
That is, the maximum
FIG. 4 is a diagram illustrating a load management method by a load control unit according to an embodiment of the present invention.
Hereinafter, a load management by the
4, the first to Nth switches 123-1 to 123-N are connected to the first to Nth capacitors 124-1 to 124-N connected in parallel according to the respective switching operations, In this case, the switching operation is performed according to the control signal of the
That is, the
At this time, the ON / OFF method of the capacitors 124-1 to 124-N can be input / opened according to the process operation, but it may be automatically controlled by the scheduler depending on the usage pattern have.
The capacitance of the capacitors 124-1 to 124-N can be connected differently according to the plurality of loads 30-1 to 30-N, and it is possible to remotely adjust the capacitance by combining the capacitors .
The capacitance of the capacitors 124-1 to 124-N varies depending on the input of the loads 30-1 to 30-N, and the capacitors 124-1 to 124- (ON) / open (OFF) of the capacitors. Thus, the input / output of the capacitors is applied to the scheduler according to each power factor, and the corresponding command is executed when the corresponding event occurs.
At this time, the scheduling method can use a general method of opening / closing the capacitors according to the time zone.
Also, a method of performing automatic scheduling for the occurrence of a corresponding event may be used as a scheduling method.
For example, 1) When the power factor # 1 event occurs ----> Capacitor 1, 3 times, 2) Power factor # 2 event ----> Capacitor 1, 3, 5 times N) ----> It is possible to perform automatic scheduling such as opening all of the capacitors.
Meanwhile, the scheduling according to time and the scheduling for the event can be performed by checking the corresponding block, and applying the single scheduling and the multiple scheduling.
Hereinafter, a method of improving the power quality and significantly reducing each item of the electricity rate of Equation (2) will be described by using the
Generally, the electricity rate is represented by each item as shown in Equation (2) below.
In this case, the base fee W1 is a charge that becomes the basis of the one-year electricity bill. As described with reference to FIG. 3, by managing the maximum power through periodical power peak information management and prediction using the
The usage fee W2 can reduce the usage fee through power management using the power information of the
The power factor charge (W3) is able to reduce the power factor charge through the flexible capacity management of the capacitors according to the leading phase / the retardant phase and the switching of the parallel capacitors as described in FIG.
For example, when there is a process using an inductive load motor or when the power factor deteriorates due to the use of a specific load, a capacitor is analyzed by analyzing the usage pattern by real-time monitoring to improve the retardant phase power factor. In general, The motor is charged from 09 to 23 hours when the operation is in progress.
Also, to improve the power factor of the leading phase, the capacitor is opened from 23:00 to 09:00 the next time the operation is finished.
Hereinafter, a flexible capacity management method of the capacitors according to the leading phase / the retardant phase will be briefly described.
Herein, the leading phase means a state in which the consumed current phase is ahead of the voltage phase supplied by a capacitive load (a load including a capacitor capacity) in the alternating current, and the retardant phase is induced in the alternating current (-) in which the consumed current phase is inferior to the voltage phase supplied by the negative load (load including the inductor capacity of the coil component).
On the other hand, in the industry, the ground power factor is deteriorated because most of the process uses a motor in which a coil component exists as a load. In order to improve the ground power factor, the capacitors are connected in parallel with the power source. Conduct.
As described in Equation (1), since the
While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention.
10: Input power 20: Output power
30: load 40: heat-dissipating fan
100: Energy management device
110:
111: Power metering section 112: Maximum power management section
120:
121: converting part 122: inverting part
123: switching unit 124: condenser unit
130: sensing unit
140: Input / output unit
150:
160:
170:
Claims (4)
A power management unit that receives the input power and acquires power usage information in real time, and measures the maximum power information and predicts the expected maximum power information on a divided basis;
A load controller for receiving the measured power factor information and adjusting the capacitance of the capacitors according to the power factor state to switch the charging or unloading of the capacitors to the loads to improve the power factor of the loads;
An input / output unit for transmitting to the load control unit a control signal for switching whether to open or close the capacitors according to the power factor state;
A communication unit for performing wired, wireless or internet communication with an external device; And
And a central processing unit for controlling the power management unit, the load control unit, the input / output unit, and the communication unit.
A power metering unit that receives the input power and acquires power usage information in real time and transmits the power usage information to the central processing unit; And
And a maximum power management unit receiving the power usage information and estimating the maximum power information and the estimated maximum power information on a divided basis.
A converter for converting an inputted AC power into a DC voltage;
An inverting unit that receives the DC voltage output from the converting unit and converts the DC voltage into an alternating current (AC) voltage of a variable voltage and a variable frequency to transmit the alternating current (AC) voltage to the loads;
A switching unit for switching on or off the loads of the capacitors according to a control signal of the input / output unit; And
And a capacitor unit including a plurality of capacitors connected in parallel and selectively turning on or off the capacitors according to a switching operation of the switching unit to selectively apply or not to power the loads. .
Wherein the capacitors are opened or turned on according to the use time of the loads, or the capacitors are opened or closed according to scheduling that is automatically set in consideration of occurrence of an event depending on a power factor state.
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KR1020140116148A KR101635541B1 (en) | 2014-09-02 | 2014-09-02 | Energy management device |
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KR1020140116148A KR101635541B1 (en) | 2014-09-02 | 2014-09-02 | Energy management device |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109213054A (en) * | 2018-11-19 | 2019-01-15 | 国网江西省电力有限公司培训中心 | A kind of capacitor intelligence control system and its control method |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3146514B2 (en) * | 1990-07-30 | 2001-03-19 | 富士電機株式会社 | Automatic power factor adjustment device |
JP2005057846A (en) * | 2003-08-07 | 2005-03-03 | Hitachi Ltd | Motor drive system and elevator drive system |
KR20110008890A (en) | 2009-07-21 | 2011-01-27 | 에스케이이노베이션 주식회사 | Multi operation apparatus for the multi utility complex |
JP2012210151A (en) * | 2010-10-01 | 2012-10-25 | Shimizu Corp | Operation management device, and operation management program |
JP2013070513A (en) * | 2011-09-22 | 2013-04-18 | Mitsubishi Electric Corp | Phase advance capacitor control device, and power factor adjuster |
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2014
- 2014-09-02 KR KR1020140116148A patent/KR101635541B1/en active IP Right Grant
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3146514B2 (en) * | 1990-07-30 | 2001-03-19 | 富士電機株式会社 | Automatic power factor adjustment device |
JP2005057846A (en) * | 2003-08-07 | 2005-03-03 | Hitachi Ltd | Motor drive system and elevator drive system |
KR20110008890A (en) | 2009-07-21 | 2011-01-27 | 에스케이이노베이션 주식회사 | Multi operation apparatus for the multi utility complex |
JP2012210151A (en) * | 2010-10-01 | 2012-10-25 | Shimizu Corp | Operation management device, and operation management program |
JP2013070513A (en) * | 2011-09-22 | 2013-04-18 | Mitsubishi Electric Corp | Phase advance capacitor control device, and power factor adjuster |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109213054A (en) * | 2018-11-19 | 2019-01-15 | 国网江西省电力有限公司培训中心 | A kind of capacitor intelligence control system and its control method |
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