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Trajectory sensitivity method-based phase-shifting transformer phase angle adjusting method

A technology of phase-shifting transformer and sensitivity method, applied in AC network voltage adjustment, reducing/preventing power oscillation, flexible AC transmission system, etc., can solve problems such as long data analysis time and inability to make real-time decisions

Inactive Publication Date: 2015-08-05
CHONGQING UNIV
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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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Embodiment Construction

[0042] The present invention will be further described below in conjunction with drawings and embodiments.

[0043] Aiming at the increasingly prominent problem of transient stability in the power system, the present invention selects a suitable FACTS——phase-shifting transformer (PST), and provides a real-time adjustment method for the angle of the phase-shifting transformer in combination with the trajectory sensitivity algorithm. When the system fails or interferes, the appropriate phase angle can be accurately calculated and adjusted in real time, so that the adjusted phase shift angle can suppress voltage fluctuations and ensure that the voltage is within a safe range, thereby improving the transient stability of the power system.

[0044] The following describes the phase angle adjustment process of this method in conjunction with a specific flow:

[0045] 1) The specific steps of high-voltage power system modeling are as follows:

[0046] 1. When the line length is with...

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Abstract

The invention discloses a trajectory sensitivity method-based phase-shifting transformer phase angle adjusting method. The method comprises the following specific steps: 1, modeling is carried out on a high-voltage power system, and the model is simplified into the simplest circuit model; 2, the phase-shifting transformer (PST) is added between two nodes, voltage at a power utilization end can be controlled through adjusting the phase angle between the two nodes, and power flow between the nodes is thus adjusted; 3, the trajectory sensitivity method is adopted to predict and adjust the phase angle, the current voltage state is judged according to the offset degree of the current voltage on the best voltage, when the offset distance at the next time point is predicted to be over large and exceeds a safety range according to the algorithm, the phase angle is timely adjusted to enable the voltage range at the next time point to be in the safety range, and voltage stability is ensured; and 4, the third step is repeated for real-time detection and control.

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...

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Application Information

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IPC IPC(8): H02J3/12H02J3/24
CPCY02E40/10H02J3/12H02J3/24
Inventor 柴毅张可冯晓卉田甜邱翊峰
Owner CHONGQING UNIV
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