A Phase Angle Adjustment Method of Phase-shifting Transformer Based on Trajectory Sensitivity Method

Abstract

A phase angle adjustment method of a phase-shifting transformer based on the trajectory sensitivity method. The specific steps are as follows: 1. Model the high-voltage power system and simplify it to the simplest line model; 2. Add a phase-shifting transformer between two nodes ( PST). By adjusting the phase angle between the two nodes, the voltage of the power consumption terminal can be controlled, thereby adjusting the power flow between the nodes; 3. The trajectory sensitivity method is used to predict and adjust the phase angle, according to the deviation of the current voltage from the optimal voltage To judge the current voltage state, when the algorithm predicts that the offset distance to the next time point is too large and exceeds the safe range, adjust the phase angle in time so that the voltage value at the next time point is within the safe range , to ensure the stability of the voltage; 4. Repeat step 3 for real-time detection and control. The present invention designs a method for adjusting the phase angle of the phase-shifting transformer based on the trajectory sensitivity method. When a fault or interference occurs in the power system, the method is used to adjust the phase angle of the circuit so that the voltage value of the power system is within the safe range. It can ensure the stability of the power system.

Description

technical field [0001] The invention relates to the technical field of control in smart grids, in particular to a method for adjusting the phase angle of a phase-shifting transformer based on a trajectory sensitivity method. Background technique [0002] Modern power systems are often on the edge of transient security and stability constraints. The statistics of power system stability failure accidents at home and abroad show that the accident rate of transient stability failures ranks first. However, most of the current transient stability emergency control strategies are formulated based on the expected accident set. Therefore, it is of great significance to strengthen the research on the safety and stability analysis of large power grids. [0003] At present, there are three main methods for analyzing the transient stability of power systems: time-domain simulation method, direct Lyapunov method, and artificial intelligence method. The transient stability analysis method...

AI Technical Summary

Problems solved by technology

The advantage of the time domain simulation method is that it is accurate and reliable, but the disadvantage is that the data analysis time is too long to make real-time decisions; the direct method is currently the only method based on stability theory to analyze the transient stability of power systems, and it is also the most promising online application method. Transient stability analysis method, fast calculation speed, can quantitatively analyze the degree of transient stability

Due to some problems in this method, so far, there is no direct method that can compare with the conventional time-domain simulation method in terms of model detail, accuracy and reliability, and it can only be used as a power system transient stability analysis. Auxiliary means

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