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TCR type SVC voltage control method for transformer substation

A voltage control method and technology of voltage control, applied in AC network voltage adjustment, flexible AC transmission system, reactive power compensation, etc., can solve the problem of SVC voltage without separate compensation bus, avoid frequent switching and improve stability , strong practical effect

Inactive Publication Date: 2010-10-20
ELECTRIC POWER RES INST STATE GRID JIANGXI ELECTRIC POWER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is: in order to solve the problem of SVC voltage control without a separate compensation bus, the present invention provides a TCR type SVC voltage control method for substations

Method used

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  • TCR type SVC voltage control method for transformer substation
  • TCR type SVC voltage control method for transformer substation
  • TCR type SVC voltage control method for transformer substation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] See figure 1 , According to the basic flow of TCR type SVC used in substation voltage control, first set the 220 / 500kV voltage control target fixed value and adjust the dead zone. Among them, the voltage control target setting is mainly issued by the dispatching department based on actual operating experience and daily system voltage requirements. The adjustment dead zone is determined based on operating experience and system accounting. Usually, the 220 / 500kV voltage change of a capacitive compensation branch system is the largest 1.2 times the value, the interval obtained by the 220 / 500kV voltage control target fixed value plus or minus the dead zone is regarded as the control target fixed value range. SVC uses this to detect whether the current high voltage side voltage is within the target range. The second step is to set the upper and lower limits of the 10 / 35kV voltage and the upper and lower limits of the TCR output. The 10 / 35kV voltage upper and lower limits are ...

Embodiment 2

[0021] In this embodiment, the adjustment dead zone is 1.15 times of the maximum voltage change of 220 / 500kV of a capacitive compensation branch. The interval obtained by adding or subtracting the dead zone of the 220 / 500kV voltage control target is regarded as the control target set value range. . The upper limit of 10 / 35kV voltage is taken as the fixed value of capacitive compensation branch overvoltage protection minus 1.25 times the maximum value that the 10 / 35kV voltage of a capacitive compensation branch may rise. The limit is taken as the minimum value of 10 / 35kV voltage acceptable for normal operation of the substation plus the maximum value of the 10 / 35kV voltage drop of a capacitive compensation branch. If the 220 / 500kV voltage is lower than the control target fixed value range, if it drops below 0.8 standard unit within 3 cycles, it is considered as a system failure, and the TCR output drops to zero immediately to release all capacitive reactive power to quickly supp...

Embodiment 3

[0024] In this embodiment, when the 220 / 500kV and 10 / 35kV voltages are measured and judged, the 220 / 500kV voltage drops below 0.8 standard unit within 3 cycles, which is regarded as a system failure, and the TCR output immediately drops to zero, releasing all capacitive components. Work to support the voltage. The adjustment dead zone is 1.3 times of the maximum voltage change of 220 / 500kV of a capacitive compensation branch. The interval obtained by adding or subtracting the adjustment dead zone to the 220 / 500kV voltage control target is regarded as the control target setting range. The upper limit of 10 / 35kV voltage is taken as the fixed value of capacitive compensation branch overvoltage protection minus 1.15 times the maximum value that 10 / 35kV voltage may rise when a capacitive compensation branch is put into use; the lower limit of 10 / 35kV voltage is taken as normal substation The minimum value of 10 / 35kV voltage acceptable for operation plus the maximum value of the 10 / 3...

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Abstract

The invention discloses a TCR type SVC voltage control method used in a transformer substation. The method comprises the following steps: the control objective fixed value as well as the adjusting dead area of 220 / 500 kV voltage and the limit value as well as the TCR power output upper and lower limit values of 10 / 35 kV voltage are set respectively; the 220 / 500 kV voltage and the 10 / 35 kV voltageare measured and judged; aiming at the different 220 / 500 kV and 10 / 35 kV voltages, different TCRs as well as the adjusting order and the adjusting method of a capacitive compensating branch are adopted. The method can effectively integrates the level of the 10 / 35 kV voltage while controlling the 220 / 500 kV voltage of the transformer substation, thereby avoiding the frequent switch of the capacitive compensating branch, considering the demands of various complicated working conditions, and having wider applicability; at the same time, a self-regulating factor fuzzy controller is adopted to control the TCR output, and an error weighting coefficient which automatically adjusts according to the error magnitude is introduced to satisfy the demands of different control stages, thereby improvingthe whole control effect.

Description

Technical field [0001] The invention relates to a TCR-type SVC voltage control method for substations, in particular to a TCR-type SVC voltage control method that takes the 220 / 500kV voltage of the substation as the control target and takes into account the 10 / 35kV voltage adjustment. Background technique [0002] Reactive power is very important for the operation of the power supply system and the load. With the development of power systems, the demand for fast dynamic compensation of reactive power is increasing. The traditional reactive power dynamic compensation device is a synchronous camera, but its loss and noise are large, operation and maintenance are complicated, and the response speed is slow. In recent years, it has been gradually replaced by a static reactive power compensation device (SVC). Early SVCs were mainly of the saturable reactor (SR) type, but because their cores needed to be magnetized to a saturated state, the loss and noise were also large, and there we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/16
CPCY02E40/34Y02E40/12Y02E40/10Y02E40/30
Inventor 范瑞祥孙旻肖红霞
Owner ELECTRIC POWER RES INST STATE GRID JIANGXI ELECTRIC POWER CO
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