A method and apparatus for determining a configuration region of a dynamic reactive power compensation device

Abstract

The invention discloses a method for determining a configuration area of a dynamic reactive power compensation device. The method comprises the following steps: building a system simulation model of apower network to be studied, wherein the system simulation model includes: M candidate stations and N faults of dynamic reactive power compensation equipment to be configured; performing static stability simulation calculation on candidate stations to obtain the first voltage weakness index of the candidate stations in static stability dimension; performing transient stability simulation calculation on the candidate stations to obtain the second voltage weakness index of the candidate stations in the transient stability dimension; calculating a comprehensive voltage weakness index of the candidate stations according to the first voltage weakness index and the second voltage weakness index. The method considers the priority of static stability angle and transient stability angle comprehensively based on the voltage variation of candidate station buses, the variation of reactive power and the influence factors of adjacent candidate stations, and can obtain the configuration area of dynamic reactive power compensation devices effectively and accurately.

Description

Technical field [0001] The invention relates to the technical field of power systems, and in particular to a method and device for determining the configuration area of ​​a dynamic reactive power compensation device. Background technique [0002] At present, the voltage and reactive power problems of my country's main receiving end power grids (such as the Beijing-Tianjin-Hebei power grid, the Yangtze River Delta power grid, and the Pearl River Delta power grid) are becoming more and more prominent. There are two main reasons. On the one hand, multi-circuit DC is fed into the receiving-end power grid (multi-feeding receiving-end system). Under steady-state conditions, the reactive power consumption of conventional DC is generally determined by the capacitors and filters configured in the converter station. However, in the process of DC power recovery after a large disturbance in the system, the reactive power output of the capacitors and filters configured in the converter statio...

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Problems solved by technology

There are two main reasons. On the one hand, the reactive power consumption of conventional DC is generally completely consumed by the capacitors and filters configured in the converter station under steady-state conditions. However, during the recovery process of DC power after a large disturbance in the system, due to the large drop in the bus voltage, the reactive power output of the capacitors and filters configured in the converter station cannot meet the reactive power consumption requirements of the DC system, and the DC system needs to receive power from the AC grid. Absorb a large amount of reactive power. If the dynamic reactive power supporting capacity of the receiving end system is insufficient, the bus voltage may not be restored for a long time after a large disturbance, and voltage instability may occur. On the other hand, due to the continuous increase in the proportion of motor loads in the grid, During the fault recovery process after the fault disappears, the motor load will absorb a large amount of reactive power, so the higher the proportion of the motor load, the greater the dynamic reactive power that needs to be provided by the system. If the dynamic reactive power support capacity of the system is insufficient, the system voltage may It cannot be recovered for a long time, and the problem of voltage instability occurs

[0003] In order to improve the dynamic reactive power support capability of the power grid, it is necessary to install dynamic reactive power compensation equipment (such as condensers, STATCOM, SVC, etc.) The problem to be solved is that although there are some methods for configuring the installation location of dynamic reactive power compensation equipment, the configuration scheme cannot comprehensively consider the priority order of static stability angle and transient stability angle and the interaction between candidate sites, and cannot accurately obtain the dynamic Configuration area of ​​reactive power compensation equipment

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