KR20190043297A - Apparatus for controlling voltage regulation based on voltage measurement, Method thereof, and Computer readable storage medium having the same - Google Patents

Abstract

The present invention relates to a voltage adjustment controlling technique and, more specifically, to a voltage adjustment controlling apparatus based on voltage measurement, which measures voltage in a distribution line in real time and determines a tap position of a voltage adjustment controlling apparatus such as a main transformer, an automatic voltage adjuster or the like of a distribution substation based on the measured voltage in real time, and a method thereof. In addition, the voltage adjustment controlling apparatus based on voltage measurement comprises a plurality of measuring instruments and a voltage adjuster.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage-based voltage control device, a method of controlling the same, and a computer-readable storage medium storing the method.

The present invention relates to a voltage regulation control technique, and more particularly, to a voltage measurement method for measuring a voltage in real time in a distribution line and determining a tap position of a voltage regulator such as a main transformer or an automatic voltage regulator of a substation Based voltage regulation control apparatus and method.

In particular, the present invention relates to a voltage measurement-based voltage adjustment control apparatus and method for determining a tap position of a voltage adjustment apparatus operated in an on-load tap changer (OLTC) system.

A typical voltage regulator for controlling the voltage of the power distribution system includes a main transformer of the substation of the substation or a step-voltage regulator (SVR) of the power line, all of which control the voltage of the secondary by tap adjustment of the transformer The device that controls the voltage in this manner with the device is called an on-load tap changer (OLTC) or an under-load tap changer (ULTC). Hereinafter, it is referred to as a voltage regulating device or an OLTC.

The OLTC can be operated by the manual control method and the automatic control method. Of these, the automatic control method adjusts the voltage of the secondary side by the determination part which determines the position (rising or falling) of the tap called AVR (Automatic Voltage Regulator) .

In general, the voltage regulator such as OLTC operates in an automatic control mode and there are various algorithms for determining the tap of the AVR. However, in general, by using Line Drop Compensation (LDC) .

In LDC operation, the input value used to estimate (predict) the magnitude of the voltage drop is called the constant value. Assuming that the LDC setting is properly calculated, it is easy to apply in a general power distribution system, There are advantages.

However, there is a problem that it is very difficult to calculate the LDC setting properly in the actual field, and accordingly, various methods of estimating the LDC correction value of the OLTC using the LDC operation method have been proposed.

A voltage regulator (OLTC), such as a main transformer of a distribution substation or a step-voltage regulator (SVR), which controls the secondary voltage by adjusting the taps of the transformer, It is operated by the automatic control method operated. In this case, the most common method of determining the tap position is the LDC operation method.

A diagram showing this LDC operation mode is shown in Fig. As shown in Fig. 1, the magnitude of the voltage drop to the load center point is calculated based on the load current I_load and the line equivalent impedance Z_eq measured by the voltage regulator, and the voltage value V_center (Rising or falling) of the voltage regulating device through comparison between the current delivery voltage V_send and a reference value V_ref to be maintained, by calculating a delivery voltage reference value V_ref to be maintained in the voltage regulating device on the basis of the delivery voltage reference value V_ref, . ≪ / RTI >

The following equation is a concept explaining a method of calculating a delivery voltage reference value in LDC operation.

At this time, the line from the OLTC to the load center point expressed by the voltage drop value (R_eq) due to the resistive current and the inductive current voltage drop value (X_eq), which is a variable used to calculate the voltage drop size from the LDC operation to the load center point The equivalent impedance (Z_eq) is called the LDC correction value.

However, due to the difficulty in estimating the LDC setting properly, there is a problem that the result of the calculation of the voltage drop size occurring from the LDC operation to the load center point estimated by the LDC operation is different from the voltage drop amount generated in the actual distribution line .

Particularly, due to the fact that the distributed power source is connected to the power distribution system recently, the local voltage fluctuation due to the distribution line and the size of the algae (load) measured by the voltage regulator are different from the actual load size, There is a problem that it is difficult to control the voltage appropriately.

An example of a method of calculating the LDC correction value is Korean Registered Patent No. 10-1123936 (registered on February 28, 2012) and Korean Patent Laid-Open No. 10-2015-0026243. However, in the case of Korean Patent No. 10-1123936, there is a large error in the magnitude of the voltage drop from the LDC to the center of the load calculated by the LDC to be solved. This is due to the fact that in the distribution line connected with the distributed power supply, There is a problem that it is difficult to expect a control effect.

In the case of Korean Patent Laid-Open Publication No. 10-2015-0026243, a problem about the error caused by the fact that the value of the voltage drop from the LDC operation to the load center point is different from the voltage at the actual load center point is effective There is a problem that it can not be solved.

The voltage drop size from the load center point predicted by the LDC to the load center point when the AVR (Automatic Voltage Regulator) operation of the OLTC-type voltage regulator (main transformer substation of distribution substation or SVR) It is possible to expect an effective voltage control result and an effective tap position determination of the OLTC.

However, when the OLTC-type voltage regulator used in the prior art determines the tap position by the LDC operation method, there is a problem that it is difficult to escape the limitation on the voltage control due to the error between the predicted value and the actual value at the load center point.

1. Korean Registered Patent No. 10-1123936 (Registration date: Feb. 28, 2012) 2. Korean Patent Publication No. 10-2015-0026243

The present invention has been proposed in order to solve the problem according to the above background art, and it is an object of the present invention to provide a voltage measuring device for measuring a voltage in real time on an electric wire line and measuring the voltage of the voltage adjusting device such as a main transformer of a substation or an automatic voltage regulator And to provide a measurement-based voltage adjustment control apparatus and method.

In addition, unlike the LDC, which estimates the magnitude of the voltage drop to the load center point, the present invention can solve the problem of the conventional technique of controlling the proper voltage control due to the error between the predicted value and the actual value, The present invention also provides a voltage measurement control apparatus and method based on voltage measurement.

In addition, the present invention is a method for determining the tap position of the voltage regulating device, which includes ① upper and lower limit value control for operating the voltage regulating device within the proper voltage range, ② voltage average value control for operation near the target voltage, (3) Upper limit of boundary value control for driving for the purpose of reducing the load (CVR), (4) Voltage regulation based control device and method for implementing the lower limit threshold value control, and There is a purpose.

In order to accomplish the above-mentioned object, the present invention provides a voltage measurement-based voltage adjustment control device for measuring a voltage in real time on an electric line and determining a tap position of a voltage adjustment device such as a main transformer or an automatic voltage regulator of a substation to provide.

The voltage measurement-based voltage adjustment control device includes:

Multiple instruments; And

A voltage regulator for determining a tap position according to a predetermined control purpose using actual measurement information obtained from the plurality of meters and keeping the tap position within a predetermined set value or a set range for controlling a voltage value of the power distribution line .

At this time, the voltage regulator includes an input unit for acquiring actual measurement information from a plurality of meters installed in a power distribution line; A determining unit for determining a tap position according to a control purpose preset based on the actual measurement information; And an output unit for outputting a control command for maintaining a voltage value of a secondary or lower distribution line within a predetermined setting value or a preset range for controlling the voltage value.

In addition, the plurality of meters may have an installation point including an overvoltage vulnerability point and a low voltage vulnerability point.

The actual measurement information may be an actual voltage value of the plurality of meters and an actual voltage value measured by the secondary side transformer.

Further, the tab position may be a rise or a fall.

In addition, the control command includes upper and lower threshold value control for operating within an appropriate voltage range, voltage average value control for operation near the target voltage, upper limit threshold value control for operation to prevent grid loss, And a lower limit threshold value control for the lower limit threshold value.

Here, the upper and lower limit value control may be performed to maintain the voltage between the maximum reference voltage value and the minimum reference voltage value, which is set in advance, to be less than the maximum reference voltage value when the maximum measurement voltage value exceeds the maximum reference voltage value. And determines the size of the tab to be equal to or greater than the minimum reference voltage value when the minimum measurement voltage value is less than the preset minimum reference voltage value, And if the minimum reference voltage value is greater than or equal to the minimum reference voltage value, the size of the tab may be zero.

The voltage average value control may determine a tap position that is the smallest among average values obtained by squaring the difference between the average reference voltage value and the measured voltage value so as to be kept close to the average reference voltage value to be maintained in the electric line.

The upper limit threshold value control may be performed such that the tap size is determined so that the maximum value of the measured voltage exceeds the maximum reference voltage value and the maximum value of the tap voltage is less than the maximum reference voltage value, And the size of the tab is determined so as to be operated close to the reference voltage value.

The lower limit threshold value control may further include determining a tap size such that the measured voltage minimum value is greater than or equal to a minimum reference voltage value if the measured voltage minimum value is less than the minimum reference voltage value, The size of the tab may be determined so as to be operated close to the predetermined value.

On the other hand, another embodiment of the present invention provides a method of measuring a measurement signal, comprising the steps of: (a) (b) a voltage regulator acquiring actual measurement information from the plurality of meters; And (c) the voltage regulator determines a tap position according to a control application set in advance using the actual measurement information, and maintains the tap position within a preset value or a preset range for controlling the voltage value to the power distribution line; And a control unit.

The step (c) may further include the steps of: acquiring actual measurement information from a plurality of meters provided in an input-side distribution line; Determining a tap position according to a control application that is preset based on the actual measurement information; And outputting a control command to maintain the voltage value of the output section of the secondary or lower distribution line within a predetermined set value or a preset range for controlling the voltage value.

On the other hand, another embodiment of the present invention can provide a computer-readable storage medium storing the program code for executing the voltage measurement-based voltage adjustment control method described above.

According to the present invention, since voltage control of the on-load tap changer (OLTC) is controlled based on the voltage measured in the actual distribution line, the voltage drop size is not predicted as in the case of LDC (Line Drop Compensation) Since the current measured by the adjusting device is not utilized in determining the tap, it is possible to solve the problems of the prior art.

In addition, as another effect of the present invention, the voltage of the voltage regulating device is adjusted based on the voltage of the distribution line directly below the secondary side, which is provided with the voltage regulating device and controls the voltage, so that the voltage regulator And that it can be effectively and appropriately controlled depending on the operational purpose of the device.

Further, as another effect of the present invention, there are (1) upper and lower limit value control for operation within an appropriate voltage range, ( 2) voltage average value control for operation near the target voltage, (3) upper limit threshold value control for operation for minimizing system loss, (CVR: Conservation Voltage Reduction), and (4 ) lower limit threshold value control .

Further, as another effect of the present invention, the measuring voltage of the distribution line necessary for determining the tap of the voltage regulating device in the voltage regulating device control device can be acquired through a separate measuring device. However, And can be obtained through a separate operating system (distribution operation system or MDMS (Metering Data Management System) of AMI (Advanced Metering Infrastructure) system), which is highly utilizable.

1 is a diagram showing a general LDC (Line Drop Compensation) operation mode.
2 is a conceptual diagram of a voltage measurement-based voltage regulation and control apparatus according to an embodiment of the present invention.
3 is a flowchart illustrating a voltage measurement-based voltage adjustment process according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for similar elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term " and / or " includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Should not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a voltage measurement-based voltage regulation and control apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a conceptual diagram of a voltage measurement-based voltage regulation and control apparatus according to an embodiment of the present invention. Referring to FIG. 2, the apparatus includes a plurality of instruments 201 to 204, a voltage regulator 210 that maintains a preset value or a voltage within a preset range using actual measurement information acquired from the plurality of instruments, and the like Lt; / RTI >

The first to fourth meters 201 to 204 may be a relay, a voltage sensor, or the like.

The voltage regulator 210 determines a tap position according to a predetermined control purpose using the actual measurement information obtained from the plurality of meters and sets a preset value for controlling the voltage value of the power distribution line 20 or And keeps it within the setting range.

In particular, the voltage regulator 210 may be a voltage measurement based voltage regulator (OLTC).

The voltage regulator 210 may be configured to include the control device 220. The device 220 includes an input unit 223 for obtaining actual measurement information from a plurality of meters 201 to 204 installed in the distribution line 20, An output unit 221 for outputting a control command for keeping the voltage value of the secondary or less distribution line 20 within a preset range or a preset range for controlling the voltage value, .

The number of meters 201 to 204 provided in the distribution line 20 is preferably as many as possible, but it may be installed in a location where voltage is weak to minimize the number of meters to be installed. The instrument installation points include overvoltage vulnerability points and low voltage vulnerability points.

The information transmitted from the input unit 223 to the determination unit 222 is transmitted to a power transformer (PT) of the voltage regulator 210 through the voltage value of the meters installed in the voltage weak point of the power distribution line 20, Is the voltage value measured at the time t.

The determination unit 222 determines the tap position of the voltage regulator according to the purpose of operation (control) of the voltage regulator 210.

The output unit 221 is a portion for instructing the voltage regulator of the tap position of the voltage regulator 210 determined by the determination unit 222. In other words, the output unit 221 outputs the rising or falling of the tap position based on the value determined by the determination unit 222 (Not shown) of the voltage regulator 210. In the present embodiment,

3 is a flowchart illustrating a voltage measurement-based voltage adjustment process according to an embodiment of the present invention. Referring to Fig. 3, an input unit (223 in Fig. 2) acquires actual measurement information from a plurality of meters 201 to 204 installed in the distribution line 20 (step S300). Thereafter, a determination unit 301 for determining the tap position of the voltage regulator 210 according to its operation purpose is configured based on the actual measurement information received from the input unit 223. In particular, the actual measurement information received at the input unit 223 includes an actual voltage value of the plurality of meters and an actual voltage value measured at the secondary side transformer.

The determination unit 222 determines the measured voltage maximum value VM_max and the measured voltage minimum value VM_min among the actual measurement information received from the input unit 223 (step S310).

Thereafter, a detailed portion 303 for determining the tap position (rising or falling) of the voltage regulator 210 based on the maximum value of the measured voltage and the minimum value of the measured voltage is configured according to the operation purpose thereof.

The determination reference value for determining the tap position of the voltage regulator 210 includes a maximum reference voltage value VL_max, a minimum reference voltage value VL_min, an average reference voltage value VL_avg, (V_tap) of the voltage fluctuation per one tap of the voltage regulator, and this judgment reference value can be set by the user (system operator) as needed.

In this detail section 303, (1) upper and lower limit boundary value control, (2) voltage average value control, (3) upper limit boundary value control, and (4) lower limit boundary value control are executed (steps S320, S321, S322 and S323).

① Upper and lower limit boundary value control

The upper and lower limit threshold value control is intended to maintain the voltage values of all the busbars within the appropriate voltage range, that is, between the maximum reference voltage value and the minimum reference voltage value to be maintained in the distribution line (20 in FIG. 2).

The tap position of the voltage manipulator 210 determined by the upper and lower limit threshold value control is determined by the following criteria.

When the measured voltage maximum value (VM_max) exceeds the maximum reference voltage value (VL_max), the size of the tap to be adjusted by the voltage regulator is determined to be equal to or less than the maximum reference voltage value. This can be expressed by the following equation.

Here, VM_max is a measured maximum voltage value, VL_max is a maximum reference voltage value, and [Delta] V_tap is a magnitude value of a voltage varying per one tap of the voltage regulator.

When the measured voltage minimum value VM_min is less than the minimum reference voltage value VL_min, the size of the tap to be adjusted by the voltage regulator is determined to be equal to or greater than the minimum reference voltage value.

Here, VL_min is a minimum reference voltage value, VM_min is a minimum measurement voltage value, and V_tap is a magnitude value of a voltage fluctuation per tap of the voltage regulator.

In other cases, that is, when the VM_max is equal to or less than VL_max and the VM_min is equal to or greater than VL_min, the size of the tap to be adjusted by the voltage regulator 210 is 0, which is expressed by the following equation.

② voltage average control

The voltage average value control aims to keep the voltages of all the bus lines as close as possible to the target voltage, that is, close to the average reference voltage value to be held in the power distribution line 20.

The average reference voltage value (VL_avg) in the voltage average control can generally be set to the nominal voltage of the power distribution system (about 1.0 p.u.). In order to achieve the purpose of the voltage average value control, the tap position of the voltage regulator which minimizes the following objective function can be determined.

Where Vi is the actual measured voltage value and VL_avg is the average reference voltage value.

However, if the voltage acquisition point is limited to the voltage weak point of the distribution line 20, the objective function for achieving the purpose of the voltage average value control can be simplified by the following equation.

Here, VL_avg is an average reference voltage value, and VM_avg is an average value of the measured voltage values, which can be calculated as follows.

(I) an average of the measurement voltage maximum value VM_max and the measurement voltage minimum value VM_min,

Ii) the average of all measured voltage values

The voltage average value control can determine the tap position of the voltage regulator as shown in Equation (5) or (6).

③ Upper limit threshold value control

The upper limit threshold control refers to controlling the tap of the voltage regulator to keep the voltage value of all buses close to the maximum reference voltage value to be kept in the distribution line. This is because the higher the voltage to the distribution line reduces the loss of the system, the upper limit threshold control can be said to operate for the purpose of minimizing the system loss. The tap position of the voltage regulator determined by the upper limit threshold value control is determined by the following criteria.

I) If the measured voltage maximum value (VM_max) exceeds the maximum reference voltage value (VL_max), determine the tap size to be adjusted by the voltage regulator so as to be equal to or less than the maximum reference voltage value. This can be expressed by the following equation.

Here, VM_max is a measured maximum voltage value, VL_max is a maximum reference voltage value, and [Delta] V_tap is a magnitude value of a voltage varying per one tap of the voltage regulator.

When the measured voltage maximum value VM_max is equal to or less than the maximum reference voltage value VL_max, the size of the tap to be adjusted by the voltage regulator is determined to be close to the maximum reference voltage value.

④ Lower limit threshold value control

Lower bound threshold control refers to controlling the tap of the voltage regulator so that the voltage value of all buses is kept close to the minimum reference voltage value to be maintained in the distribution line. This is because, generally, when the supply voltage decreases, the load power consumption also decreases proportionally. Therefore, the lower limit value control can be said to operate for the purpose of reducing the load by lowering the voltage to the distribution line.

The tap position of the voltage regulator determined by the lower limit threshold value control is determined by the following criteria.

I) If the minimum measurement voltage VM_mix is less than the minimum reference voltage VL_min, the size of the tap to be adjusted by the voltage regulator is determined to be equal to or greater than the minimum reference voltage value.

Ii) When the minimum measurement voltage VM_min is equal to or greater than the minimum reference voltage value VL_min, the size of the tap to be adjusted by the voltage regulator is adjusted so as to operate close to the minimum reference voltage value.

Thereafter, the output unit outputs a control command according to this control (step S330).

The terms "input unit", "determination unit", "output unit", and the like described in the specification mean units for processing at least one function or operation, and may be implemented by hardware or software or a combination of hardware and software.

(DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, a microprocessor, and the like, which are designed to perform the above- , Other electronic units, or a combination thereof. In software implementation, it may be implemented as a module that performs the above-described functions. The software may be stored in a memory unit and executed by a processor. The memory unit or processor may employ various means well known to those skilled in the art.

The voltage measurement based voltage adjustment control method according to the present invention can be implemented in the form of a program command which can be executed through various computer means and recorded in a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination.

The program code (command) recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like.

The medium may be a transmission medium such as an optical or metal line, a wave guide, or the like, including a carrier wave for transmitting a signal designating a program command, a data structure, or the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

20: Distribution line
201 to 204: First to fourth relays
210: Voltage regulator
220: Control device
221: Output section
222:
223:

Claims (17)

Multiple instruments; And
A voltage regulator for determining a tap position according to a predetermined control application by using actual measurement information acquired from the plurality of meters and maintaining the tap position within a preset value or a preset range for controlling the voltage value of the power distribution line;
Wherein the voltage-regulated voltage-regulating controller includes:
The method according to claim 1,
The voltage regulator includes:
An input unit for acquiring actual measurement information from a plurality of meters installed in the distribution line;
A determining unit for determining a tap position according to a control purpose preset based on the actual measurement information; And
And an output unit for outputting a control command to maintain a voltage value of a secondary or lower power distribution line within a predetermined set value or a set range to be controlled.
The method according to claim 1,
Wherein the plurality of meters have an installation point including an overvoltage weak point and a low voltage vulnerable point.
The method of claim 3,
Wherein the actual measurement information is an actual voltage value of the plurality of meters and an actual voltage value measured by the secondary side transformer.
The method according to claim 1,
Wherein the tap position is a rising or falling position.
3. The method of claim 2,
The control command includes an upper limit lower limit value control for operating within an appropriate voltage range, a voltage average value control for operating near the target voltage, an upper limit threshold value control for operating to prevent the system loss, And the threshold value control.
The method according to claim 6,
The upper and lower limit value control is performed so as to keep the voltage between the maximum reference voltage value and the minimum reference voltage value set in advance so that the maximum value of the measured voltage is less than the maximum reference voltage value, And determines the size of the tab to be equal to or greater than the minimum reference voltage value when the minimum measurement voltage value is less than the preset minimum reference voltage value, And the size of the tab is zero when the minimum reference voltage value is equal to or greater than the minimum reference voltage value.
The method according to claim 6,
Wherein the voltage average value control unit determines a minimum tap position among a mean value obtained by squaring the difference between the average reference voltage value and the measured voltage so as to maintain the average voltage value close to the average reference voltage value to be maintained in the electric line, .
The method according to claim 6,
The upper limit threshold value control is performed,
And when the maximum value of the measurement voltage exceeds the maximum reference voltage value, determines the size of the tab to be less than the maximum reference voltage value, and if the maximum value of the measurement voltage is less than the maximum reference voltage value, And the size of the voltage adjustment control unit is determined.
The method according to claim 6,
The lower limit threshold value control
And determines the size of the tab to be closer to the minimum reference voltage value if the measured voltage minimum value is greater than or equal to the minimum reference voltage value, and if the measured voltage minimum value is greater than or equal to the minimum reference voltage value, Voltage-based voltage-regulation control device.
(a) generating a plurality of actual measurement information by an instrument;
(b) a voltage regulator acquiring actual measurement information from the plurality of meters; And
(c) determining, by the voltage regulator, a tap position according to a predetermined control application using the actual measurement information, and maintaining the tap position within a preset value or a preset range for controlling a voltage value to the power distribution line;
Wherein the voltage adjustment control method comprises:
12. The method of claim 11,
The step (c)
Acquiring actual measurement information from a plurality of measuring instruments installed in an input part distribution line;
Determining a tap position according to a control application that is preset based on the actual measurement information; And
And outputting a control command to maintain the voltage value of the output section of the secondary or lower voltage distribution line within a preset range or a preset range for controlling the voltage value.
12. The method of claim 11,
Wherein the plurality of meters have an installation point including an overvoltage vulnerable portion and a low voltage vulnerable portion.
14. The method of claim 13,
Wherein the actual measurement information is an actual voltage value of the plurality of meters and an actual voltage value measured by the secondary side transformer.
12. The method of claim 11,
Wherein the tap position is a rising or falling position.
13. The method of claim 12,
The control command includes an upper limit lower limit value control for operating within an appropriate voltage range, a voltage average value control for operating near the target voltage, an upper limit threshold value control for operating to prevent the system loss, And the threshold value control.
A computer readable storage medium storing a program code for executing a voltage measurement based voltage adjustment control method according to any one of claims 11 to 16.

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