SU1473003A1 - Method of regulating voltage in electric network - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to regulating the voltage of transformers in electric networks x 35-500 kV. The purpose of the invention is to increase the efficiency of regulation by preventing an unacceptable increase in the controlled voltage with any quantity and any values of the input currents. The method is to measure the magnitude of the input voltage and input currents, to form a voltage compensation current. This voltage is constantly monitored and compared with the specified limit value. If the current compensation voltage exceeds the limit value, the voltage regulator setting is automatically changed.

In addition, the current compensation voltage is summed with the input voltage, the resulting amount is compared with the voltage regulator setting and, if the mismatch exceeds the deadband, form a control command. 1 il.

Description

. .one

The invention relates to electrical engineering, in particular to regulating the voltage of transformers in networks of 35 to 500 kV.

The purpose of the invention is to increase the efficiency of regulation by preventing an unacceptable increase in the controlled voltage for any number and value of input currents.

The drawing shows a block diagram for implementing the method.

The circuit contains series-connected current sensors 1 and 2, current compensation block 3, automatic control unit 4, start body 5, time delay element 6, actuator 7, voltage transformer 8, drive 9, power transformer 10

The method is carried out as follows.

Permanently measured by i-lt inu w-sd voltage and input currents

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 1473003

they reconcile the voltage of the current compensation, control this voltage, compare it with a predetermined limit value and, when the voltage exceeds the current compensation limit, automatically change the setting of the voltage regulator; the current compensation voltage is summed with the input voltage, the resulting Q sum is compared with the controller setting by voltage, and when the dead zone mismatch value is exceeded, a command is generated at regulation 6, it controls the current compensation block 3 and adjusts the automatic 4 block regulation. The automatic control unit 4 measures the input voltage supplied from the voltage transformer 8, adds the input voltage to the current compensation voltage, compares the sum obtained with the voltage setting and controls the drive 9 of the control device under the load of the power trans

lirovanie. formatter (autotransformer) 10.

When the voltage reaches the current When the total voltage exceeds the limit, then the max. Automatically changes the setting of the automatic control unit of the current compensation of the triggering voltage of the trigger body 5 to the input of the actuator 7 of the regulator, and the current 20 drops the signal from the specified delay value is blocked. The new value of the setting of the automatic control unit U is determined by the maximum permissible value of the voltage Id, taking into account the dead zone of the regulator

and; and ,,, - oh, 5e,

where is the width of the dead zone.

meni The time delay for actuator actuation is necessary for the detuning from short-term changes of input currents; its value is set at several (by 3-5 s) less than the delay time for actuation of the automatic control unit 4. The executive authority 7 commands the measurement of the regulator with this setting of the setpoint of the unit 4 to ensure that the regulated voltage is maintained within,

When the voltage of the current compensation becomes less than the value because the max. Value automatically restores the initial setting of the automatic control unit U, and the action of the current compensation is released.

This scheme implements the method as follows.

The total voltage of the current compensation from the output

the connected sensors 1 and 2 of the current supplying the initial compensation to the automatic control unit 4 via the block 3 of the current compensation block. The number of current sensors, each of which has two current inputs, can be pro CQ

arbitrary (depending on the number of control variables).

The trigger 5 measures the total voltage of the current.

state, m recovery of the initial setting of the automatic adjustment block and the effect of current compensation.

Claims (1)

Formula from the range and The method of regulating the voltage in the electrical network, consisting in compensation at the output of sensors 1 and 2 that measure the input voltage current and has a threshold characteristic srabatshani. Executive body 7, receiving a signal from the starting organ 5 through the charge element  When exceeding, the total the current compensation voltage srabatshan starting body 5 to the input of the executive body 7 postumeni. The time delay for actuator actuation is necessary for the detuning from short-term changes of input currents; its value is set somewhat (by 3–5 s) less than the delay time for actuation of the automatic control unit 4. Executive body 7 leads teams to measure 0 Whose regulation and blocking of the current compensation, which ensures stabilization of the regulated voltage in accordance with the changed 5 setting of the automatic control unit 4. By reducing the total voltage of the current compensation to the voltage of the return of the starting body 5, the signal at the input of the executive body 7 disappears. In this case, the executive body 7 issues a command to carry out the automatic control unit 4 and the block 3. state, m restoration of the initial setting of the automatic control unit and the action of current compensation. Formula from the range and and The method of regulating the voltage in the electrical network, consisting in and currents, form the voltage of the current compensation, sum up the voltage TOf of the compensation, with the input voltage, compare the received with a voltage regulator setpoint and a control command is formed, characterized in that, in order to improve the control efficiency by preventing an unacceptable increase in the regulated voltage with any quantity and any input current values, the total current compensation voltage is controlled and compared with a given limit and when this limit is reached, the voltage is maintained at the maximum allowable voltage level.