Power grid reactive compensation method based on ip-iq method and phase-controlled switching technology

Abstract

The invention provides a power grid reactive compensation method based on ip-iq method and phase-controlled switching technology. The power grid reactive compensation method includes step S1, detecting reactive current in a power grid in real time by the ip-iq method; step S2 performing signal zero-crossing point extraction by adopting a digital filtering technology; S3, receiving a zero-crossingpoint signal through a phase controller, using switch on/off action to switch a capacitor bank to realize zero-current input and zero-voltage cutting. According to the method, reactive current of thesystem is detected by adopting the method, and the method is also applicable under the condition of system voltage distortion and asymmetry. By adopting digital filtering, high-frequency interferencecan be effectively eliminated, and the alternating-current signals collected by the system are subjected to filtering processing. Noise and temperature drift can be avoided, and the requirement for the phase characteristics of the filter can be met. The signal zero-crossing point in the power grid performs switching action, the electric energy quality and reliability of the system can be improved,the electric power system can be simplified, and the system investment is reduced.

Description

technical field [0001] The invention belongs to the field of electric energy quality and reactive power compensation, and in particular relates to a method for reactive power compensation of a power grid based on an ip-iq method and a phase control switching technology. Background technique [0002] In recent years, non-linear loads (power electronic devices) have been increasingly used in power supply systems, and a large number of reactive power and harmonics have entered the power grid, seriously affecting power quality problems, such as voltage flicker, frequency changes, etc., which have greatly affected The normal use and safe operation of electrical equipment. There are a large number of resistive and inductive loads in coal mining enterprises. During normal work, resistive and inductive loads absorb reactive power in the grid. The generator can provide a certain amount of reactive power, but it is unreasonable to often transmit it over long distances. It must be cons...

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Problems solved by technology

Because the p-q method does not consider the zero-sequence component in the modeling, there is a large error in the measurement of the three-phase unbalanced system, so it can only be applied to the harmonic detection of the three-phase balanced system

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