JP3426961B2 - Autonomous distribution line voltage regulator and voltage control method for high voltage distribution line using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for controlling a voltage of a power system by coordinating a plurality of autonomous distribution line voltage regulators arranged in a distributed manner.

[0002]

2. Description of the Related Art At present, the voltage of a distribution line is managed so that the voltage drop between the distribution line bus and the terminal of the distribution line is within 600V. A high voltage distribution line as shown in FIG.
B, C, and D. In these four pole transformers, four taps are set according to the voltage of the high voltage line in order to properly maintain the low voltage side power supply.

[0003] When the output voltage of the substation is 6,900 V, general consumers using the pole transformer of A are:
Electricity is supplied from a pole transformer using a 750V tap through a low voltage line and a service line, and within this range, the voltage can be controlled within a voltage management range (101 ± 6V).

A pole transformer using a 6,600V tap of B, a pole transformer using a 6,450V tap of C, and a pole transformer using a 6,300V tap of D will be described below. In a certain section, it can be kept within the voltage management range.

At present, as a method of keeping the voltage of a high-voltage distribution line within an allowable range, a reference voltage adjustment by LRT, a high-voltage automatic voltage regulator (hereinafter, SVR), a switched capacitor (hereinafter, SC), and a static voltage regulator (hereinafter, referred to as SVR). (SVC) and the like.

In the LRT system, a voltage drop is calculated based on a time load assumed in advance, and a delivery voltage of a substation is adjusted every time so that a customer terminal voltage is optimized. It can be switched eight times a day.
The setting value and the timing of switching are determined by the person based on the distribution line voltage drop calculation value and the sending current individual measurement value,
Adjustments are made in units of distribution transformers.

[0007] The SVR system aims at making the voltage at the load center point in the system constant, and uses a line voltage drop compensator (LD).
C), the voltage is adjusted according to the line condition (changes in voltage, current, and power factor). The voltage adjustment range of the SVR is eight steps of 120V width. In this system, it is possible to install on a pole for each line.

[0008] The SC (timer) system is a system in which an SC is installed in a distribution line and advancing reactive power is generated to reduce a voltage drop, and voltage compensation of a power supply side of about 100 V per SC is performed. This system can be installed on a pole for each line, and the connection and disconnection of the capacitor to the high-voltage distribution line is managed individually by the timer value set by calculating the injection time based on the distribution line voltage drop calculation value or individual measurement value. is necessary.

In the SVC method, a capacitor that generates a leading reactive power and a reactor that generates a lagging reactive power are combined with a thyristor to perform phase control to adjust a voltage.
Since there is no contact, the voltage is continuously controlled from the lead to the delay. This method has a high response speed, so that it can follow a temporary voltage drop, and can be installed on a pole for each line (for example, JP-A-6-289946, JP-A-6-301432, etc.). ).

[0010]

The conventional pole transformer is:
6,700V, 6,600V, 6,450V, 6,30
In order to properly maintain the low voltage side power supply among the four taps of 0 V, taps corresponding to the voltage of the high voltage line are set.
This tap setting is performed in advance according to the system and load conditions at the time of new installation or replacement of pole transformers.Therefore, if there is a system change or a sudden increase or decrease of the load, a large number of You need to change the tap settings. For this reason, for the purpose of labor saving of the tap change work of the transformer and appropriate voltage management, the use of one tap of the pole transformer is being pursued. However, when one tap is used, the above-described current methods have the following problems.

(1) The LRT system only adjusts the delivery voltage, and does not take measures against a voltage drop of a long and long distribution line, that is, measures against a single tap. Further, fine adjustment of the voltage cannot be performed because the set value is not determined by actual measurement but is stepwise adjusted. (2) In the SVR system, it is necessary to install a plurality of SVRs for one tap, and the construction cost is high. (3) In the SC (timer) system, it is necessary to install a plurality of units in order to make one tap, and the system lacks resilience against load fluctuations and system changes, so that the reliability of voltage control is low. (4) In the SVC method, it is necessary to install a plurality of SVCs for one tap, so that the construction cost is high and the cost is higher than other devices.

Therefore, the problem to be solved by the present invention is as follows.
An object of the present invention is to provide an autonomous distribution line voltage regulator that realizes one tap at low cost and enables optimization of voltage management, and a voltage control method for a high-voltage distribution line using the same.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an autonomously operating constant voltage controllable voltage adjusting method applied to a high-voltage distribution line, the method comprising the steps of: A capacitor or reactor connected and connected to increase or decrease the voltage of the high-voltage distribution line,
A voltage detector that measures the voltage of the high-voltage distribution line, and a three-phase average value of the voltage measurement values measured by the voltage detector when the voltage measured by the voltage detector deviates from a set voltage. The moving average value at a predetermined time is compared with the lower limit value and the upper limit value of the voltage adjustment range, and the automatically adjusted delay is set.
After the elapse of the delay time, several cycles before the switch operation again
Comparing the equalized voltage value with the upper and lower limits of the voltage adjustment range
And the three-phase average voltage value of the several cycles is higher than the lower limit value.
The switch is turned on smaller size than the upper limit value
Open the switch and connect the capacitor to the high-voltage distribution line.
Connect and open, measure the voltage measured by the voltage detector
Moving average value and voltage adjustment of the three-phase average value for a predetermined time
The upper limit and lower limit of the adjustment range are compared and automatically adjusted.
After the specified delay time elapses, several cycles before the switch operation again
And the upper and lower limit of the voltage adjustment range
The three-phase average voltage value of the several cycles is
If it is larger than the upper limit, turn on the switch, and
If it is smaller than the value, open the switch and
Was a control device connected and open to the high-pressure distribution line
Connect the autonomous distribution line voltage regulator to the high-voltage distribution line on the power supply side.
From the substation at regular intervals from
Voltage drop or voltage rise in each section of the distribution line to the end
Distributed installation according to the installation standard so that it is within the constant voltage range
The voltage of the high-voltage distribution line is maintained in a constant voltage range over the entire length.
It is characterized in that the adjustment is made within a predetermined range. Ma
In addition, the autonomous distribution line voltage regulator of the present invention is a high-voltage distribution line.
A voltage regulating system applied to the high-voltage distribution line;
Connected via a switch to increase the voltage of the high-voltage distribution line
Or the capacitor or reactor to be dropped and
A voltage detector for measuring the voltage of the high-voltage distribution line;
When the voltage deviates from the set voltage, release the switch.
With a control device that opens and closes
Moving average of the measured values of the three phases of the measured voltage for a predetermined time
Value and the lower and upper limits of the voltage adjustment range.
If the moving average is smaller than the lower limit, the switch
And if it is larger than the upper limit, open the switch.
Connecting and disconnecting the capacitor to the high voltage distribution line
Is a three-phase average of the voltage measurement values measured by the voltage detector.
The moving average value and the upper limit of the voltage adjustment range during the specified time of the value
The moving average value is compared with the lower limit value.
If it is larger than the value, turn on the switch, and
If it is smaller, open the switch and raise the reactor
Means for connecting and disconnecting to a distribution line, and the voltage detector
The three-phase average value of the voltage measurement values measured at
Compared with the lower limit and the upper limit, the three-phase average
Lower than the limit value by more than the specified voltage value and continue for more than the specified time
In this case, the switch is turned on after the delay time, and the upper limit is set.
The voltage has risen from the value by more than the specified voltage and has continued for the specified time.
In this case, open the switch after the delay time and raise the capacitor.
Connect to and disconnect from the distribution line or detect the voltage
The three-phase average value of the voltage measurement value measured by the instrument is the voltage adjustment range
Compared with the upper limit and lower limit of the above, the three-phase average value is
The voltage rises from the upper limit by more than a predetermined voltage value and is
If it continues, close the switch after the delay time and
From the limit value for more than the specified voltage and continue for more than the specified time
If the switch is open after the delay time,
Means for connecting and disconnecting to the high voltage distribution line;
Means for automatically adjusting the delay time of the closing / opening control,
The voltage compensation value exceeds the dead band value obtained by subtracting the lower limit value from the upper limit value.
If the line voltage is not less than the open circuit voltage,
Means for correcting the upper limit value such that the upper limit value becomes higher.
And the number before the switch operation again after the set delay time
Three-phase average voltage value of cycle and upper limit value of the voltage adjustment range
.Comparing with the lower limit, the three-phase average voltage value of the above several cycles
Exceeds the upper and lower limits of the voltage adjustment range.
Turn the switch on and off to open the condenser or reactor.
Means for connecting / disconnecting to the high voltage distribution line
In addition, the dead zone voltage value is
Means to automatically increase or decrease in consideration of the switching phenomenon
It is characterized by the following.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the following development concept was developed in order to make it possible to maintain an appropriate voltage at low cost and without maintenance. (1) SC so that the voltage drop in each section of the distribution line from the substation delivery to the terminal is within one tap of the pole transformer
To control the voltage. (2) Develop a control device that measures the voltage at the SC installation location and autonomously controls the opening and closing of switches. (3) A plurality of SCs are distributed and installed on one distribution line to enable coexistence with SVR.

Specifically, the moving average value of the three-phase average value of the voltage measurement values measured by the voltage detector for a predetermined time is compared with the lower limit value and the upper limit value of the voltage adjustment range, and the moving average value is determined. If it is smaller than the lower limit, the switch is turned on. If it is larger than the upper limit, the switch is opened to connect and open the capacitor to the high-voltage distribution line.

Further, a moving average value of a three-phase average value of the voltage measurement values measured by the voltage detector in a predetermined time is compared with an upper limit value and a lower limit value of a voltage adjustment range, and the moving average value is compared with the upper limit value. If it is larger than this, the switch is turned on, and if it is smaller than the lower limit, the switch is opened to connect and open the reactor to the high-voltage distribution line.

The three-phase average value of the voltage measurement values measured by the voltage detector is compared with the lower limit value and the upper limit value of the voltage adjustment range,
If the three-phase average value falls below the lower limit by a predetermined voltage value or more and continues for a predetermined time or more, the switch is turned on after a delay time, and rises by a predetermined voltage or more from the upper limit value,
And when it continues for a predetermined time or more, the switch is opened after the delay time, and the capacitor is connected and opened to the high voltage distribution line.

The three-phase average value of the measured voltage values measured by the voltage detector is compared with the upper limit value and the lower limit value of the voltage adjustment range,
When the three-phase average value rises by a predetermined voltage value or more from the upper limit value and continues for a predetermined time or more, the switch is turned on after a delay time, and falls by a predetermined voltage or more from the lower limit value,
And when it continues more than a predetermined time, the said switch is opened after a delay time, and a reactor is connected and opened to a high voltage distribution line.

The delay time of the closing / opening control of the switch is automatically and randomly adjusted to prevent hunting by a capacitor or a reactor.

When the voltage compensation value exceeds a dead band value obtained by subtracting the lower limit value from the upper limit value, and when the line voltage is not less than the upper limit value, the upper limit value is automatically corrected so that the upper limit value is increased. Prevents hunting due to capacitors or reactors.

After the set delay time has elapsed, the three-phase average voltage values of several cycles before the switch operation and the upper and lower limits of the voltage adjustment range are compared again, and the three-phase average voltage values of the several cycles are compared. If the voltage exceeds the upper and lower limits of the voltage adjustment range, the switch is turned on and off to connect and open the capacitor or reactor to the high-voltage distribution line, thereby preventing hunting due to the capacitor or reactor.

The number of times the switch is operated by a capacitor or a reactor is smoothed by automatically increasing or decreasing the dead band voltage value in consideration of the voltage drop of the distribution line system and the Ferranci phenomenon every time the switch operates.

In order to implement these voltage control methods for a high-voltage distribution line, the autonomous distribution line voltage regulator of the present invention uses a moving average of a three-phase average value of the voltage measurement values measured by the voltage detector in a predetermined time. The value is compared with the lower limit value and the upper limit value of the voltage adjustment range.If the moving average value is smaller than the lower limit value, the switch is turned on. Connect to and disconnect from the distribution line, or compare the moving average value of the three-phase average value of the voltage measurement values measured by the voltage detector in a predetermined time period with the upper limit value and the lower limit value of the voltage adjustment range. If the average value is larger than the upper limit value, the switch is turned on, and if the average value is smaller than the lower limit value, the switch is opened, and the reactor is connected to the high-voltage distribution line and opening means,
The three-phase average value of the voltage measurement values measured by the voltage detector is compared with a lower limit value and an upper limit value of a voltage adjustment range, and the three-phase average value falls by a predetermined voltage value or more from the lower limit value for a predetermined time. If the above continues, the switch is turned on after a delay time, the voltage rises by a predetermined voltage or more from the upper limit, and if the switch continues for a predetermined time or more, the switch is opened after the delay time and the capacitor is connected to the high voltage distribution line. Connect or disconnect, or compare the three-phase average value of the voltage measurement value measured by the voltage detector with the upper limit value and the lower limit value of the voltage adjustment range, and the three-phase average value is a predetermined voltage value from the upper limit value. When the voltage rises above and continues for a predetermined time or more, the switch is closed after a delay time, falls below the lower limit by a predetermined voltage or more, and when continued for a predetermined time or more, opens the switch after the delay time. High reactor Means for connecting and disconnecting from the distribution line, means for automatically adjusting the delay time of the switching on / off control of the switch, and when the voltage compensation value exceeds a dead band value obtained by subtracting the lower limit value from the upper limit value, Means for automatically correcting the upper limit so that the upper limit is increased when the line voltage is not lower than the open-circuit voltage; and a three-phase average voltage of several cycles after a set delay time and before the switch operation. The value is compared with the upper limit and lower limit of the voltage adjustment range, and if the three-phase average voltage value of the several cycles exceeds the upper limit and lower limit of the voltage adjustment range, the switch is turned on and off. Means for connecting and disconnecting the capacitor or reactor to the high-voltage distribution line, and means for automatically increasing or decreasing the dead band voltage value in consideration of the voltage drop and the ferranci phenomenon of the distribution line system each time the switch operates. Configuration.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings. FIG. 1 shows the system configuration of the present invention.
Shown in In the figure, 1 is a distribution substation, 2 is a high voltage distribution line, 3 is a dry transformer for voltage measurement as a voltage detector, 4
Is a control box for SC (hereinafter SCC), 5 is a switch, 6 is SC
(Or reactor), 7 is a power transformer.

FIG. 2 is a block diagram showing the internal configuration of the voltage regulator 4. In the figure, 8 is a measurement circuit, 9 is a power supply circuit, 10 is a logic circuit, and 11 is a control circuit.

In FIGS. 1 and 2, two 0.5 kVA voltage measuring dry transformers 3 installed on the same column as the SC 6 are converted into a three-phase low voltage by V connection. The measurement circuit 8 of the SCC 4 takes in the converted low voltage, converts it to a high voltage, and measures the voltage of each phase of the high voltage line. The SC 6 is connected in parallel to the high-voltage distribution line 2, and compensates for the reactive current of the distribution line 2 with the leading current of the SC 6, thereby reducing the voltage drop of the high-voltage distribution line.

The system is distributed and installed at a plurality of locations on one distribution line, and the voltage of each installation location is autonomously managed and controlled to maintain the voltage of the entire distribution line within a predetermined range. FIG. 3 shows the set values of the on-voltage and the off-voltage that determine the on / off voltage control of the switch in the SCC. In this embodiment, the voltage control width is set to 20 in order to keep the tap of the transformer 3 within one tap range.
The voltage was determined to be 0 V, and the SC compensation voltage was set to 100 V in consideration of the influence on the consumer equipment due to a sudden voltage change due to the SC operation. In SCC4 of the present embodiment, an average voltage value for 5 minutes was adopted to prevent unnecessary operation due to instantaneous voltage fluctuation of the distribution line. In addition, a fixed tolerance voltage was set at the upper and lower limits to maintain the voltage control width (200 V).

Table 1 shows the main functions of the SCC.

[Table 1]

Next, the SC setting standard of the present invention will be described. (1) Number of installed units (maximum voltage drop -200) ÷ 100 ・ ・ ・ ・ ・ Rounded up

(2) Capacity and installation range

[Table 2]

(3) Positioning procedure (a) First unit (from the load side) Section where voltage is high by about 10 to 20 V from the end (b) Second unit and thereafter See FIG. 4 On the voltage axis, SC1 voltage to SC1 compensation voltage Find points. (Point A) A straight line is drawn from SC1 on the curve to A, and an intersection with the curve is obtained. (SC2) When they do not intersect, the SC1 adjacent section is set as the SC2 installation section. Repeat the above to the power supply side to perform positioning for the number of units. If the required number is not satisfied even when the reactance becomes 1.7Ω, it is appropriately arranged near the center of the positioned SC. After positioning as described above, the compensation voltage for each SC is calculated, and if it is insufficient, the number of units is added.

FIG. 5 shows a processing flow of the voltage regulator in the embodiment of the present invention. Step 100 (moving average value control processing) In this step, after performing a moving average calculation processing for 5 minutes, the moving average calculation processing is compared with the dead zone value and controlled. Step 110 (Instantaneous Voltage Control Processing) In this step, when the line voltage rises or falls by more than a predetermined voltage value from the open / close voltage value of the SC and continues for a predetermined time or more, the SC is opened or turned on. Step 120 (delay time control processing) In this step, a switch is turned on for each voltage regulator.
Automatically and randomly set and control the delay of the opening operation. Step 130 (Instantaneous Value Comparison Processing) In this step, the instantaneous value (5 cycle average voltage) immediately before the opening / closing control is compared with the lower limit value and the upper limit value of the voltage adjustment range for control. Step 140 (Hunting prevention control processing) In this step, when the voltage compensation value exceeds the dead band value or when the line voltage is not less than the upper limit value, the increase / decrease of the upper limit value is automatically controlled. Step 150 (operation number smoothing control processing) In this step, the dead band voltage value is automatically increased / decreased in consideration of the voltage drop of the distribution line system and the ferranci phenomenon for each operation of the switch. Step 160 (Result Record Processing) In this step, the result record is recorded on the IC card.

FIG. 6 shows a daily voltage transition (a) and an SCC operation state (b) in a certain high-voltage distribution line system when the present invention is carried out. 4 SC1-SC4
Were distributed and installed in the distribution system to control the voltage. The operation timing in this operation test is shown below. 10:00 Start SCC operation 10:37 SVR1 tap fixed 10:52 SVR3 tap fixed 11:18 SCC4 start 11:30 SVR4 tap fixed 11:37 SCC1 start 13:10 SCC2 start 13:35 SCC3 start 14:10 Start operation with SVR1, LDC first setting change 15:50 Start operation with SVR1, LDC second setting change As can be seen from FIG. 6 (a), after starting operation, the line voltage is 6,750. It is controlled within a setting range of up to 6,550 V.

Although the above embodiment has been described with respect to an example in which the SCs are dispersedly arranged in the high-voltage distribution line, when the distribution line voltage increases toward the end due to the ferranci phenomenon,
A reactor is used instead of SC.

[0035]

As described above, according to the present invention, the following effects can be obtained. (1) There is no hunting phenomenon due to mutual interference of SCs (or reactors) dispersedly arranged in the high-voltage distribution line, and the voltage can be controlled within a predetermined voltage range even in the event of a distribution line accident or system change. (2) According to the present invention, voltage control within one tap range of the transformer can be performed, so that tap change is unnecessary, and maintenance-free and low-cost voltage management accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a system configuration of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a voltage regulator according to the present invention.

FIG. 3 is an explanatory diagram showing set values of a closing voltage and an open voltage according to the present invention.

FIG. 4 is an explanatory diagram showing a positioning procedure of a parallel capacitor installation reference in the present invention.

FIG. 5 is a processing flowchart of the voltage adjusting device according to the embodiment of the present invention.

FIG. 6 shows a daily voltage transition (a) and an SCC operation state (b) in a certain distribution system when the invention is implemented.

FIG. 7 is an explanatory diagram showing a voltage management method based on tap adjustment of a pole transformer.

[Explanation of symbols]

1 distribution substation, 2 high-voltage distribution lines, 3 dry transformers for voltage measurement (voltage detector), 4 SCC (control box for SC),
5 switch, 6 SC (switched capacitor) or reactor, 7 power transformer, 8 measuring circuit, 9 power circuit, 10 logic circuit, 11 control circuit

Continuation of the front page (72) Inventor Fumitaka Morita 2-1-2, Watanabe-dori, Chuo-ku, Fukuoka, Fukuoka Prefecture (72) Inventor Katsuki Kabemura 2-1-1, Watanabe-dori, Chuo-ku, Fukuoka, Fukuoka No. 82 Kyushu Electric Power Co., Inc. (56) References JP-A-2-189610 (JP, A) JP-A-3-92912 (JP, A) JP-A-6-38374 (JP, A) Kinya Ikemoto, power factor Considering the adjustment, the field engineer library power factor adjustment technique, Japan, Denki Shoin Co., Ltd., May 25, 1985, 1st edition, pages 4 and 5, especially "3. (58) Field surveyed (Int. Cl. ⁷ , DB name) H02J 3/00-5/00

Claims (7)

(57) [Claims] 1. A voltage adjusting method applied to a high-voltage distribution line and capable of autonomously operating and controlling a constant voltage, wherein the capacitor is connected to the high-voltage distribution line via a switch to increase or decrease the voltage of the high-voltage distribution line. Or a reactor, a voltage detector for measuring the voltage of the high-voltage distribution line, and three of the voltage measurement values measured by the voltage detector when the voltage measured by the voltage detector deviates from a set voltage. The moving average value of the phase average value for a predetermined time is compared with the lower limit value and upper limit value of the voltage adjustment range, and the adjustment is automatically made.
After the specified delay time elapses, several cycles before the switch operation again
And the upper and lower limit of the voltage adjustment range
The three-phase average voltage value of the several cycles is
If it is smaller than the lower limit, the switch is turned on and the upper limit is set.
If larger, open the switch and set the capacitor to high pressure
Connected to the distribution line and opened, measured by the voltage detector
Moving average of the measured values of the three phases of the measured voltage for a predetermined time
Value and the upper and lower limits of the voltage adjustment range.
After the delay time adjusted and set by the operation, before the switch operation again
Above the three-phase average voltage value of several cycles
Limit value and lower limit value, and compare the three-phase average
If the pressure value is greater than the upper limit, turn on the switch
If it is smaller than the lower limit, open the switch.
An autonomous distribution line voltage regulator having a control device for connecting and disconnecting the reactor to the high-voltage distribution line.
At predetermined intervals, change the power distribution line from the power supply side to the terminal.
Voltage drop in each section of distribution line from
Must meet the installation standards so that the voltage rise is within a certain voltage range.
The distribution of the voltage of the high-voltage distribution line is
Adjustment within a certain range, which is within a certain voltage range.
High voltage distribution line voltage control method . 2. The method according to claim 1, wherein the voltage measured by the voltage detector is three.
Compare the phase average with the lower and upper limits of the voltage adjustment range
And the three-phase average value is lower than the lower limit value by a predetermined voltage value or more.
If the switch is lowered and continues for a predetermined time or more,
Input after the delay time, and rise above the upper limit by a predetermined voltage or more
And if it continues for more than a predetermined time, the switch is delayed.
Open after a while to connect and open the capacitor to the high voltage distribution line.
2. The high-voltage distribution line according to claim 1,
Pressure control method . 3. The voltage measurement value 3 measured by a voltage detector.
Compare the phase average with the upper and lower limits of the voltage adjustment range
And the three-phase average value is higher than the upper limit value by a predetermined voltage value or more.
If the switch has risen and has continued for a predetermined time or more,
Turn on after the delay time and drop below the lower limit by more than a predetermined voltage
And if it continues for more than a predetermined time, the switch is delayed.
Open after a while and connect and open the reactor to the high voltage distribution line.
2. The high-voltage distribution line according to claim 1,
Pressure control method. 4. A delay time of closing / opening control of said switch.
Automatically and randomly adjust and set the capacitor or reactor
Claims to prevent hunting due to torque
Item 4. The voltage control method for a high-voltage distribution line according to Item 2 or 3. 5. The voltage compensation value is obtained by subtracting a lower limit value from an upper limit value.
Line voltage is not below the upper limit value
In such a case, the upper limit is automatically set so that the upper limit is increased.
Hunting with capacitor or reactor with compensation
2. The high-voltage distribution line according to claim 1, wherein the high-voltage distribution line is prevented.
Voltage control method. 6. A dead zone voltage value is distributed for each operation of the switch.
Automatically taking into account the voltage drop and ferranci phenomenon in the line system
By increasing or decreasing the capacitor or reactor
Smoothing the number of operations of the switch by the
The voltage control method for a high-voltage distribution line according to claim 1. 7. A voltage adjustment system applied to a high-voltage distribution line.
Before being connected to the high-voltage distribution line via a switch
A capacitor that raises or lowers the voltage of the high-voltage distribution line
Or measure the voltage of the reactor and the high-voltage distribution line
The voltage detector and the detected voltage are outside the set voltage.
A control device for closing and opening the switch when the switch is opened.
Of the three-phase average of the voltage measured by the voltage detector
The moving average and the lower limit of the voltage
And the moving average value is compared with the lower limit value.
If it is smaller, turn on the switch and make it larger than the upper limit.
If necessary, open the switch to connect the capacitor to the high-voltage distribution line.
Connect and disconnect or measure with the voltage detector
Moving average of the measured three-phase average value of the measured voltage for a predetermined time
The average value is compared with the upper and lower limits of the voltage adjustment range.
If the moving average value is larger than the upper limit value,
And if it is smaller than the lower limit, the switch
Open and connect and open the reactor to the high voltage distribution line.
Means for measuring the voltage measured by the voltage detector.
Compare the phase average with the lower and upper limits of the voltage adjustment range
And the three-phase average value is lower than the lower limit value by a predetermined voltage value or more.
If the switch is lowered and continues for a predetermined time or more,
Input after the delay time, and rise above the upper limit by a predetermined voltage or more
And if it continues for more than a predetermined time, the switch is delayed.
Open after a while to connect and open the capacitor to the high voltage distribution line.
Release or measure the voltage measured by the voltage detector
The average value of the three phases is calculated as the upper and lower limits of the voltage adjustment range.
And comparing the three-phase average value with a predetermined voltage value from the upper limit value.
If it rises and continues for more than a predetermined time,
After the delay time, and lower than the lower limit by a predetermined voltage or more.
If the switch is lowered and continues for a predetermined time or more, the switch is delayed.
Open after the delay time, connect the reactor to the high voltage distribution line and
Opening means and delay of closing / opening control of the switch
Means to automatically adjust the voltage and whether the voltage compensation value is
If the lower limit is subtracted from the dead band, the line voltage will open.
If not below the discharge voltage, the upper limit automatically increases.
Means to correct the upper limit so that the set delay time
After the lapse of time, the three-phase average voltage for several cycles before the switch operation again
Value and the upper and lower limits of the voltage adjustment range, and
The three-phase average voltage value in the numbered cycles is above the voltage adjustment range.
If the limit or lower limit is exceeded, turn the switch on and off.
To connect and open the capacitor or reactor to the high-voltage distribution line.
Discharge means and dead band voltage value distribution for each switch operation
Automatically taking into account the voltage drop and ferranci phenomenon in the line system
Autonomous type characterized by comprising means for increasing and decreasing
Distribution line voltage regulator.