Voltage reactive power comprehensive control method of extra-high voltage transformer substation

Abstract

The invention relates to a voltage reactive power comprehensive control method of an extra-high voltage transformer substation. The process include a first of calculating changing situations of extra-high voltage medium voltage and reactive power when reactive power output changes in a machine group, a second step of calculating changing situations of the extra-high voltage medium voltage and reactive power in the process of switching changes in low capacity and low resistance in the extra-high valve station, a third step of calculating changing situations of the extra-high voltage medium voltage and reactive power when different active power flows are sent downwards by an extra-high main transformer, a fourth step of drawing a voltage reactive power comprehensive control nine-zone diagram according to the calculating results of the first step and the third step, and a fifth step of controlling the system and enabling the system to run in an normal operation area according to the corresponding position of a present operating point in the nine-zone diagram. Compared with the prior art, according to the voltage reactive power comprehensive control method of the extra-high voltage transformer substation, the problems that opposite voltage regulating measures are repeatedly adopted, and the system vibrates in the adjacent area are effectively solved. Operation times of reactive power voltage regulating equipment are reduced, and the voltage reactive power comprehensive control method of the extra-high voltage transformer substation has the advantages of guaranteeing the quality of network voltage and controlling fast and efficiently.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method for comprehensively controlling voltage and reactive power of an ultra-high voltage substation. Background technique [0002] Due to the large reactive power throughput capacity of UHV AC transmission, the operation mode of the 500kV power grid in the vicinity of its landing point is more complex and changeable, which is bound to have a greater impact on voltage. Voltage is an important indicator to measure power quality. Excessive voltage fluctuations will not only affect the operating life and efficiency of electrical equipment, but also endanger the safe and stable operation of the system. In severe cases, it may even cause voltage collapse and cause large-scale power outages. East China is economically developed, and the power grid has particularly strict requirements on voltage quality. In order to ensure the voltage quality and reactive power balance near the UHV dro...

AI Technical Summary

Problems solved by technology

The upper and lower limits of the voltage and reactive power of the traditional control strategy are fixed, and the impact of changes in the operation mode is not considered. In some operation modes, it may be difficult to regulate the reactive power due to the limited reactive power and voltage regulation capacity in the station.

At the same time, this strategy cannot timely adjust the coordination relationship between voltage and reactive power in the process, and it is prone to the problem that the system operating point repeatedly oscillates in the adjacent abnormal area after the voltage regulating device operates

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