Method for controlling reactive voltages of transformer substation based on magnetic control reactor (MCR)

Abstract

The invention discloses a method for controlling reactive voltages of a transformer substation based on a magnetic control reactor (MCR). The method comprises the following three steps of: voltage time-shared control, counter-voltage adjustment control and closed loop control. By using the characteristics of the MCR capable of smoothly outputting reactive power, the MCR is matched with the conventional capacitor bank and a loaded high-voltage tap in the transformer substation, and comprehensive control and real-time control of the reactive voltages of the transformer substation and the stepless adjustment of the reactive power are realized.

Description

technical field [0001] The invention relates to a substation reactive voltage control method, in particular to a substation reactive voltage control method based on MCR (Magnetically Controlled Reactor). Background technique [0002] The voltage of the power system is one of the important indicators to measure the power quality. Common electrical equipment in power systems, such as asynchronous motors and various electric heating equipment, can only achieve the best results when they are operated at rated voltage. If the voltage deviation is too large, it will inevitably affect the life and efficiency of the equipment. In severe cases, even It will jeopardize the stability and economic operation of the grid. [0003] In the operation of the power system, the regulation of voltage and reactive power has a close relationship. Because the operating voltage level of the power system depends on the balance of reactive power, insufficient reactive power will cause the voltage to...

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Problems solved by technology

[0005] (1) This method is based on the fixed upper and lower limits of voltage reactive power, without considering the mutual coordination relationship between reactive power and voltage;

[0006] (2) The information used for calculation and analysis is random and dispersed, leading to blind uncertainty in control decisions, which is actually manifested as frequent adjustment of devices, which is likely to cause voltage instability;

[0007] (3) The sequence of actions of the two types of equipment has a great influence on the control results. If the sequence is improper, frequent actions, switching oscillations, etc. will occur;

[0008] (4) As long as it enters the qualified area, it will no longer be adjusted, which may cause the system to run on the edge of the voltage or power qualified state for a long time, and fail to control the system in the rated optimal operating state;

[0009] (5) The control of capacitors and on-load tap taps is a step-by-step voltage regulation method, and is strictly limited by the number of switching times per day. It cannot adjust the output reactive power smoothly in real time to ensure line voltage stability and reactive power balance.

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