KR101664328B1 - Switching board capable of automatic power factor compensation using fuzzy-engine - Google Patents

Switching board capable of automatic power factor compensation using fuzzy-engine Download PDF

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KR101664328B1
KR101664328B1 KR1020160039521A KR20160039521A KR101664328B1 KR 101664328 B1 KR101664328 B1 KR 101664328B1 KR 1020160039521 A KR1020160039521 A KR 1020160039521A KR 20160039521 A KR20160039521 A KR 20160039521A KR 101664328 B1 KR101664328 B1 KR 101664328B1
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power factor
power
unit
ground
calculated
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KR1020160039521A
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Korean (ko)
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이성욱
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주식회사 한국이알이시
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/24—Circuit arrangements for boards or switchyards
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/006—Measuring power factor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
    • 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
    • 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
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

According to the present invention, the optimum reactive power is calculated in accordance with the power used on the load side, and the capacity of the condenser with respect to the calculated reactive power is learned, and the reactive power is controlled based on the capacity of the learned condenser, To an automatic power factor correction function using a fuzzy engine capable of compensating for a power factor correction function.
According to the present invention, it is possible to quickly control the reactive power according to the amount of power used by the load based on the learned reactive power, thereby reducing the number of operations of the switching unit to increase the use period, It is possible to control the forward current and the ground current in a bidirectional manner by determining the forward current and the ground current according to the mode of the power used by the load and compensating the power factor therefor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a switching power supply having an automatic power factor correction function using a fuzzy engine,

More particularly, the present invention relates to a power plant having an automatic power factor correction function using a fuzzy engine. More particularly, the present invention calculates an optimum reactive power according to a power used on a load side and learns a capacity of a capacitor with respect to the calculated reactive power And an automatic power factor compensation function using a fuzzy engine that can automatically compensate the power factor by controlling reactive power based on the capacity of the learned capacitor.

The switchgear is a facility for receiving and distributing power of extraordinary high voltage in the state of being installed on the side of power consumers such as apartments, buildings, factories and substations, and it is equipped with load switchgear, switchgear, breaker and protective relay inside.

AC power is characterized by a phase relationship between current and voltage. When the inductive load is large, the current is delayed more than the voltage. When the capacity load is large, the current is higher than the voltage. A common-mode relationship arises from a resistive load or from a balance of the inductive load and the capacitive load. Resistive power is generated from the in-phase current, and reactive power is generated from the abnormal current due to the inductance of the power circuit and the capacitive reactance. At this time, the power factor that is commonly used for measuring the phase relationship between the current and the voltage corresponds to the phase angle cosine between the voltage and the current.

In other words, the load current flowing in the power system follows the grid voltage in terms of frequency and coincides with the frequency of the voltage, but the phases are different from each other, so that they are in a relationship to each other. If a load of the C component (capacitive) is generated according to the load characteristics of the power distribution side (load side), a forward current having a current precedent to the voltage flows. When a load of the L component (inductive) is generated, Ground current flows.

The power factor control is to increase the power factor of the load by the target power factor, and it can be controlled by the reactive power control method, the voltage control method, the power factor control method, the current control method and the time control method according to the control method . Of these control methods, a power factor control scheme mainly used in a power plant uses a reactive power control scheme that compensates the power factor by lowering the apparent power. Apparent power is related to the reactive power. The higher the reactive power, the higher the apparent power, and the smaller the reactive power, the lower the apparent power. Therefore, the power factor is compensated by lowering the apparent power by lowering the reactive power.

On the other hand, the power factor control in the switchboard performs separate power factor control for various loads (eg, transformers, motors, etc.) installed in the switchboard, and a large number of capacitors are used for controlling the power factor for each load. For this reason, there is a problem that the installation cost is high due to the use of a lot of capacitors in the conventional switchgear. Since a separate power factor control is required for each load, a separate power factor controller must be installed. There is a problem in that the design is complicated.

As one of techniques for adjusting the power factor in the switchboard, a switchboard having an automatic power factor adjustment function is disclosed in Patent Publication No. 10-1370036.

A phase detector configured to detect a phase of any one of the three phases and output the detected phase to a square wave having a common frequency; A phase setting unit configured to set an intermediate phase of the remaining two phases not detected by the phase detecting unit and output it as a square wave of a commercial frequency; A dividing unit configured to receive the output of the phase setting unit and to divide the output of the phase setting unit to a predetermined square wave frequency and output the frequency; A power factor adjustment control signal generator for up-counting or down-counting an output of the phase detector according to an output of the power divider to output a power factor adjusting control signal; A power factor adjustment switching unit including a plurality of switching elements to be switched to the power factor adjustment control signal; And a power factor adjusting unit configured to limit at least part or all of a plurality of capacitors having different capacitances to the commercial power according to the switching of the power factor adjusting switching unit.

However, since the above-described technology is configured to automatically compensate the power factor at predetermined intervals, the power factor must be re-calculated at regular intervals, and as the number of switching times of the power factor adjustment switching unit increases with the power factor variation, There is a problem that can occur.

KR 10-1370036 B1 (Registered on April 26, 2014)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art, and it is an object of the present invention to provide a method and an apparatus for calculating optimal reactive power according to a used electric power of a load, And to provide an automatic power factor compensating function using a fuzzy engine that can automatically adjust the power factor by controlling reactive power based on the capacity of the learned capacitor.

The present invention also provides a power distribution board having an automatic power factor correction function using a fuzzy engine capable of controlling the power factor in both directions according to the ground current and the phase current.

In order to solve the above problems, a switchboard having an automatic power factor correcting function using a fuzzy engine according to the present invention is a switchgear installed in a line of a system for providing an output signal proportional to a current flowing in a line, And a power factor control device that is connected to the system using the current and voltage measured by the instrumental current transformer and the instrumental transformer to automatically control the power factor A power factor detecting unit for detecting and providing voltage, current, active power and reactive power using output signals respectively detected from the meter transformer (PT) and the meter current transformer (CT); A power factor calculating unit that calculates a power factor based on data detected by the power factor detecting unit, compares the calculated output power factor with a target power factor, and calculates a capacity of the capacitor whose output power factor satisfies the target power factor; A learning control unit for collecting the calculated output power factor, the capacity information of the capacitor, the power factor information of the load, and the time information calculated by the power factor calculation unit with respect to the target power factor, and storing and managing the power factor; Calculating a matching rate by matching an output power factor calculated by the power factor calculating unit with a learning power factor stored and managed by the learning control unit and, when the calculated matching ratio is equal to or greater than a set value, And outputs a power factor control signal according to the power factor control signal; And a ground power factor compensator configured to include a condenser and a series reactor connected in series with the condenser, and connected to the system according to the power factor control signal output from the controller.

Here, the power factor control unit may include a display unit for displaying the power factor and the target power factor compensated according to the power factor control signal output from the controller, an input unit for inputting a target power factor displayed on the display unit, And an alarm unit for outputting an alarm message when the target power factor is not compensated.

The power factor control device may further include an AC reactor and a true power factor compensator connected to the system according to the power factor control signal output from the controller.

The ground power factor compensating unit may include a circuit breaker for blocking an abnormal current; A contact switch for controlling the connection to the system according to the power factor control signal output from the controller; A capacitor connected in parallel to the system by a contact of the contact switch; And a series reactor installed between the contact switch and the condenser, wherein the ground power factor compensating unit may be constituted by a plurality of units.

In this case, the capacities of the capacitors provided in the ground power factor correction unit are different from those of the adjacent capacitors.

According to the present invention, it is possible to quickly control the reactive power according to the amount of power used by the load based on the learned reactive power, thereby reducing the number of operations of the switching unit to improve the use period and minimizing the operation error .

Further, there is an advantage that bidirectional control of the leading current and the ground current can be performed by determining the leading current and the ground current according to the mode of the power used on the load side and compensating the power factor therefor.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a switchboard having an automatic power factor correction function using a fuzzy engine according to the present invention; FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an automatic power factor correction function using a fuzzy engine according to the present invention.
3 is an internal configuration view of a power factor control device applied to a switchboard having an automatic power factor correction function using a fuzzy engine according to the present invention.
4 is a configuration diagram of a ground power factor compensator and a phase power factor compensator applied to a switchboard having an automatic power factor correction function using a fuzzy engine according to the present invention.
FIG. 5 is a block diagram of a ground power factor compensator and a true phase power factor compensator for group control using a fuzzy engine according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

According to the present invention, the optimum reactive power is calculated in accordance with the power used on the load side, and the capacity of the condenser with respect to the calculated reactive power is learned, and the reactive power is controlled based on the capacity of the learned condenser, To an automatic power factor correction function using a fuzzy engine capable of compensating for a power factor correction function.

The switchboard 10 includes a body 11 having a plurality of divided spaces, a door being provided at one side or both sides of the body, a breakdown section automatic switch provided in the upper space of the body 11, A transformer 12 formed in the front space, a circuit breaker for interrupting the power supply, a circuit breaker for interrupting the power supply, a power fuse and a lightning arrester formed at the rear upper portion, a transformer 13 for a meter formed at the lower part, and a power factor control device 20 .

The inside of the body 11 may be partitioned into partitions having a predetermined thickness so as to distinguish the high pressure side from the low pressure side. The wall constituting the body 11 is formed by using a high- . Connected to the input terminal of the fault section automatic switch through an insulative connecting member formed on the upper portion of the body 11 from an inlet formed in the front lower side of the body 11 and a fixing member. A connecting cable is installed on the output-side terminal of the automatic breaker of the fault section so as to apply high-voltage electricity to the high-voltage side of the transformer 12 through the lightning arrester, the current-like power fuse and the transformer 14 for meters.

FIG. 2 is a schematic block diagram of a power factor control apparatus applied to a switchboard having an automatic power factor correction function using a fuzzy engine according to the present invention.

2, a circuit breaker CB for interrupting power supply to the system, a CT converter for providing an output signal proportional to the current flowing in the line, provided on one side of the line, (PT) connected to the system using the current and the voltage measured by the instrumental current transformer (CT) and the meter transformer (PT) to provide a power factor And a power factor control device 20 for automatically controlling the power factor.

3 is a block diagram illustrating an internal configuration of a power factor control apparatus applied to a switchboard having an automatic power factor correction function using a fuzzy engine according to the present invention.

3, the power factor control device 20 includes a power factor detection unit 100, a power factor calculation unit 200, a learning control unit 300, an input unit 400, a control unit 500, a ground power factor correction unit 600, a real power factor compensating unit 700, a display unit 800, and an alarm unit 900.

The power factor detecting unit 100 detects and provides voltage, current, active power, and reactive power using output signals respectively detected from the instrument transformer (PT) and the instrumental current transformer (CT).

The power factor calculating unit 200 calculates a power factor based on the data detected by the power factor detecting unit 100. The power factor calculating unit 200 calculates a power factor based on the data detected by the power factor detecting unit 100, And compares the calculated output power factor with a target power factor, and calculates a capacitance of the capacitor whose output power factor satisfies the target power factor.

Here, the power factor is calculated as the ratio of the active power to the apparent power, and the apparent power is calculated by the active power and the reactive power.

The term "high power factor (high)" means that the active power is close to the apparent power. If the power factor is high, it means that the electric appliance is used as effectively as possible for the electric power consumer. There is an advantage that the voltage drop is reduced and the utilization efficiency of the power supply facility is increased.

In addition, if the power factor is high, the power supplier alleviates the electricity bills of electric power consumers. In other words, KEPCO, which is a power supplier, applies the power factor surcharge system that surpasses the 90% power factor in proportion to the insufficiency of electricity rate. In contrast, the electricity rate is discounted in proportion to the power factor exceeding 90% .

The learning control unit 300 collects the calculated power factor, the capacity information of the capacitor, the power factor information of the load, and the time information calculated by the power factor computing unit 200 with respect to the target power factor, and stores and manages the power factor do.

On the other hand, the reactive power is divided into ground reactive power and phase reactive power.

Load-side power devices are largely composed of three kinds of R resistance load, C capacitive load (conductance) and L inductive load (inductance).

In a resistive load of R, the phase difference is the same between voltage and current. C When there is a large capacitive load (conductance), a phase ineffective power is generated when the current is 90 ° ahead of the voltage, and when the L inductive load (inductance) is large, ground reactive power is generated. Herein, when the power factor of the phase-ineffective power or the ground reactive power is detected as 90% or more, the power factor is considered to be good.

There are many L-inductive loads (inductance) at typical loads. In other words. This is because the R component and the L component exist even in a pure R resistance load, and the L component is included when the C component is connected to the electric wire. In addition, a motor for consuming a large amount of electric power among power devices used in industrial plants is an inductive load, and therefore, a method for improving ground reactive power generated by an L inductive load (inductance) is generally used.

In order to reduce the ground reactive power, the power factor is improved by connecting a phase capacitor (capacitor) to the system in parallel. However, when the phase capacitor is put into the power system at the midnight time zone when the power equipment is not used, There arises a problem that the reactive power increases. Accordingly, a timer is provided to separate the input capacitor from the power system in a predetermined time range to adjust the power factor.

However, the above-described configuration is disadvantageous in that the use time of the power device must be kept constant on a daily basis, and the user's operation is required if necessary.

Accordingly, the learning control unit 300 of the present invention is configured to determine the power factor information of the load based on whether the calculated output power factor is the ground reactive power or the phase reactive power. In addition, the learning control unit 300 may be configured to collect the time information (year, month, day, hour, day of the week, etc.) of the calculated output power factor and store and manage the data table.

The input unit 400 is for inputting a target power factor displayed on the display unit, and may include a numeric button or a vertical operation button.

The control unit 500 calculates a matching rate by matching an output power factor calculated by the power factor calculating unit 200 and a learning power factor stored and managed by the learning control unit 300 and if the calculated matching ratio is equal to or greater than a set value And outputs a power factor control signal according to the capacity information of the capacitor with respect to the matched learning power factor.

That is, the control unit 500 matches the currently calculated power factor information based on the learned power factor information obtained by collecting the capacity information of the capacitor with respect to the past output power factor, the load power factor information, and the time information, When the information belongs to the matching rate range, the learning power factor information is set as the current power factor information to control the power factor. Further, the learning power factor information is continuously stored and managed to compensate the power factor with the learning power factor information learned in the same situation.

Here, the matching rate may be configured to be given differently according to learning elapsed time. That is, since the learned power factor information is insufficient for a certain period of time (one year or quarterly), the matching rate may be set low and applied, and thereafter, the matching rate may be applied relatively high. For example, if the matching rate is 85% or more for a period of 3 months and the matching rate is 85% or more, it is determined that the same situation is satisfied and the power factor is compensated. After that, the matching rate is 95%.

That is, the controller 500 calculates the power condition for the apparent power, the active power, and the reactive power of the AC power based on the detected current and the detected voltage. Next, the calculated power situation is compared and analyzed to calculate the capacity of the capacitor to be charged so as to be controlled to the set target power factor. When the capacity of the condenser is calculated, a power factor control signal is transmitted to the terrestrial power factor compensator 600 corresponding to the calculated capacity of the power capacitor to control the corresponding terrestrial power factor compensator 600 to be supplied to the system. Also, the ground power factor compensating unit 600, which has not been selected, is configured to output a shutoff signal to be disconnected from the system.

The ground power factor compensating unit 600 includes a capacitor 630 and a series reactor 640 connected in series with the capacitor 630 and is connected to the system according to the power factor control signal output from the controller The ground reactive power is compensated. The ground power factor compensating unit 600 includes a wiring breaker 610 for interrupting the abnormal current, a contact switch 620 for controlling connection to the system according to the power factor control signal output from the controller 500, A condenser 630 charged in parallel to the system by a contact of the contact 620 and a series reactor 640 installed between the contact switch 620 and the condenser.

The series reactors 640 and SR prevent distortion of the voltage waveform due to harmonics when the power capacitor is used, suppress the inrush current when the capacitor is charged, suppress the overvoltage of the system when the capacitor is re- It suppresses the inflow of harmonic current by the source and prevents malfunction of the relay.

As described above, since the L-induced load (inductance) of the load generated by the power device is large, the ground reactive power is generated which is lagging current. Accordingly, the ground power factor compensating unit 600 is configured to be supplied to the power system under the control of the controller 500 to supply the phase ineffective power to improve the ground power factor.

On the other hand, power factor can be improved by separating the ground power factor compensating unit 600, which is not used during no-load, light load, or night-time, without using the power device, from the power system.

However, in recent years, a true power factor may be generated due to an increase in the demand for electric power devices using capacitive loads (conductances) of C, such as computers and charging devices.

Like the ground power factor, the actual power factor is applied at a discount rate over a certain range. However, the electric power rate is applied at a lower rate. In fact, if we look at the electricity rate according to the power factor at KEPCO, we will charge an additional 0.2% per 1% up to 60% if the ground power factor is below 90%, and if the average power factor is less than 95% It is stipulated that 0.2% of the basic charge per 1% is to be given as an additional charge.

Accordingly, in the present invention, a true phase power factor compensator 700 for compensating the phase power factor is provided.

The true power factor compensating unit 700 is connected to the system according to the power factor control signal output from the controller 500 and supplies ground reactive power to the system to compensate the real power factor.

The power factor compensated according to the power factor control signal output from the controller 500 and the target power factor are displayed on the display unit 800. The alarm unit 900 outputs an alarm message when the target power factor is not compensated .

4 is a configuration diagram of a ground power factor compensator and a true phase power factor compensator applied to a switchboard having an automatic power factor correction function using a fuzzy engine according to the present invention.

The ground power factor compensating unit 600 and the true phase power factor compensating unit 700 applied to the switchboard having the automatic power factor correcting function using the fuzzy engine according to the present invention may be composed of a plurality of units.

The power factor correcting unit 700 includes a wiring breaker 710 for interrupting the abnormal current, a contact switch 720 for interrupting the connection to the system according to the power factor control signal output from the controller 500, And an AC reactor 730 charged into the system by the contact of the switch 720.

In addition, reference numerals 601 to 606 denote a plurality of terrestrial power factor compensators 600, and reference numerals 701 and 702 denote a plurality of phase power factor compensators 700, respectively.

At this time, the number of the ground power factor correcting units 600 may be relatively larger than the number of the true power factor compensating units 700. That is, since the fluctuation range of the ground reactive power is relatively larger than the width of the ground reactive power according to whether the power equipment is driven or not, in order to control the ground ineffectiveness with a large variation range, A relatively large number of power factor correcting units 600 should be provided.

According to the design conditions, the capacity of each of the capacitors provided in the terrestrial power factor compensation unit may be different from that of the neighboring capacitors.

For example, as shown in FIG. 4, the capacitance of the capacitors provided in the ground power factor correction unit 601 to the ground power factor correction unit 603 is 100KVA, and the ground power factor correction unit 604 to the ground power factor correction The capacity of the capacitor provided in the unit 606 can be configured to be 60KVA.

According to this configuration, since the capacity of the condenser is variously configured, there is an advantage that the output power factor calculated from the active power, the reactive power and the apparent power can be precisely adjusted closer to the target power factor.

If it is determined that the calculated power factor is a true power factor, the controller 500 may be configured such that the true power factor compensator 700 is set to have a ground power factor under different design conditions. That is, in the above explanation, the discount range of the electricity rate based on the ground power factor is based on 90%, and since the discount range of the electricity rate based on the true power factor is based on 95%, the range of the discount rate And can be configured to be controlled with a wide ground power factor. In addition, if the phase power factor is converted into the ground power factor and controlled, the variation of the ground power factor is wide, so that it is advantageous to cope with the abrupt demand power flexibly.

FIG. 5 is a configuration diagram of a ground power factor compensator and a true phase power factor compensator for controlling the group applied to a switchboard having an automatic power factor correction function using a fuzzy engine according to the present invention.

In the case where the power consumption of the customer is greatly varied, it may take a long time to calculate the capacitor capacity when the ground power factor compensating unit 600 or the true power factor compensating unit 700 is individually controlled, A power factor control signal must be transmitted to the compensator 600 or the true power factor compensator 700, which may require a lot of switching operations.

The ground power factor compensator 600 or the true power factor compensator 700 may be configured to perform group control by setting two to five of them as one group.

For example, as described above, the capacity of the capacitors provided in the ground power factor correction unit 601 to the ground power factor correction unit 603 is 100 KVA, and the ground power factor correction unit 604 to the ground power factor correction unit 606 The first group G1 can supply the phase ineffective power in total 200 KVA and the second group G1 can supply the total 160 KVA as the phase ineffective power, The third group (G3) will be able to supply a total of 120 kVA with phase reactive power.

Further, the high-stage power factor correcting units 701 and 702 may be set as the fourth group, and may be configured to be input to or separated from the system by the same control signal.

That is, by controlling the ground power factor compensator 600 or the true power factor compensator 700 as a group, there is an advantage that a sudden change in power demand can be coped with quickly.

According to the present invention, it is possible to quickly control the reactive power according to the amount of power used by the load based on the learned reactive power, thereby reducing the number of operations of the switching unit to improve the use period and minimizing the operation error .

Further, there is an advantage that bidirectional control of the leading current and the ground current can be performed by determining the leading current and the ground current according to the mode of the power used on the load side and compensating the power factor therefor.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: switchboard 11: body
12: Transformer 13: Transformer current transformer
20: Power factor control device
100: Power factor detection unit 200: Power factor calculation unit
300: Learning control section 400: Input section
500:
600, 601 to 606: ground power factor compensator
610: Circuit Breaker 620: Contact Switch
630: Capacitor 640: series reactor
700, 701, 702:
800:
900: Alarm Department

Claims (5)

And a meter transformer provided in one line of the line and providing an output signal proportional to a current flowing in the line, and a meter transformer converting the voltage of the line into a low voltage proportional to the voltage, And a power factor control device connected to the system using the current and voltage measured by the meter transformer to automatically control the power factor,
The power factor control device includes:
A power factor detecting unit for detecting and providing voltage, current, active power, and reactive power using an output signal detected from each of the meter transformer (PT) and the meter current transformer (CT);
A power factor calculating unit that calculates a power factor based on data detected by the power factor detecting unit, compares the calculated output power factor with a target power factor, and calculates a capacity of the capacitor whose output power factor satisfies the target power factor;
Calculating and outputting the calculated power factor, the capacity information of the capacitor, the power factor information of the load, and the time information calculated by the power factor calculating unit with respect to the target power factor, and storing and managing the power factor and the calculated power factor, A learning control unit for determining power factor information of the load with respect to the reactive power;
Calculating a matching rate by matching an output power factor calculated by the power factor calculating unit with a learning power factor stored and managed by the learning control unit, and when the calculated matching ratio is equal to or greater than a set value, And outputs a power factor control signal according to the power factor control signal;
A ground power factor compensator configured to include a capacitor, a series reactor connected in series with the capacitor, and connected to the system according to a power factor control signal output from the controller;
An actual reactor power factor compensator configured to include an AC reactor and connected to the system according to the power factor control signal output from the controller and to compensate for a phase power factor by supplying ground reactive power to the system;
A display unit for displaying the compensated power factor and the target power factor according to the power factor control signal output from the controller;
An input unit for inputting a target power factor displayed on the display unit; And
An alarm unit for outputting an alarm message when the target power factor is not compensated;
/ RTI >
Wherein,
The calculated power factor information is matched with the currently calculated power factor information on the basis of the capacity information of the capacitor with respect to the past output power factor, the power factor information of the load, and the learned learning power factor information by combining the time factor information, The learned power factor information is set as the current power factor information to control the power factor, and the matching rate is configured to be given differently according to the learning elapsed time,
The ground power factor correcting unit and the true power factor correcting unit are composed of a plurality of units,
Wherein the number of the ground power factor correcting units is relatively larger than the number of the true power factor correcting units.
delete delete The method according to claim 1,
Wherein the ground power factor compensator comprises:
A circuit breaker for blocking an abnormal current;
A contact switch for controlling the connection to the system according to the power factor control signal output from the controller;
A capacitor connected in parallel to the system by a contact of the contact switch; And
A series reactor installed between the contact switch and the capacitor;
Wherein the automatic power factor correction function is implemented by a fuzzy engine.
The method of claim 4,
Wherein the capacitance of each of the capacitors provided in the ground power factor compensating unit is different from that of each of the adjacent capacitors.
KR1020160039521A 2016-03-31 2016-03-31 Switching board capable of automatic power factor compensation using fuzzy-engine KR101664328B1 (en)

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KR101850299B1 (en) * 2017-11-30 2018-04-19 주식회사 디투엔지니어링 Distributing board euipped with auto power factor adjustment and fire detection synthesis function using fuzzy engine
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KR102155669B1 (en) * 2019-10-31 2020-09-14 백윤종 Power factor improvement and ambient temperature control apparatus using piezoelectric member
KR102158087B1 (en) * 2019-12-17 2020-10-23 백승현 Power factor improvement and power generation apparatus using piezoelectric element
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KR101779909B1 (en) * 2017-01-19 2017-09-20 오성기전주식회사 Electrical panel including automatic power factor compansation system
KR101850299B1 (en) * 2017-11-30 2018-04-19 주식회사 디투엔지니어링 Distributing board euipped with auto power factor adjustment and fire detection synthesis function using fuzzy engine
KR101862054B1 (en) * 2018-02-07 2018-05-29 주식회사 디투엔지니어링 Distributing board sensing anomaly using fuzzy engine
KR102155669B1 (en) * 2019-10-31 2020-09-14 백윤종 Power factor improvement and ambient temperature control apparatus using piezoelectric member
KR102158087B1 (en) * 2019-12-17 2020-10-23 백승현 Power factor improvement and power generation apparatus using piezoelectric element
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