Determination method for partition D-STATCOM integrated optimization configuration scheme of large-scale power grid

Abstract

The invention discloses a determination method for a partition D-STATCOM integrated optimization configuration scheme of a large-scale power grid. The method comprises the steps of first starting from a dynamic analysis method theory of a non-analytic complex power system, establishing a power system non-linear equivalent model, rapidly and accurately calculating system integration dynamic equivalence impedance and load static equivalence impedance of an a load node of a study area to obtain limit margin; enabling areas with total loads ranking at the top to be weak areas according to researched network load flow calculation analysis results, enabling dispatching partitions in the weak areas to be study objects, comparing voltage stability strength indexes of every partition to determine weak partitions so as to enable the weak partitions to serve as configuration study objects, utilizing the fact that an average value of substation impedance modulus margins of the partitions is a threshold value to determine reactive power compensation to-be-selected point sets, shrinking configuration point hunting zones, and comprehensively utilizing trace sensitivity index maximum points to determine configuration points; and finally utilizing an optimal model considering voltage dip risk cost to determine an optimal capacity.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof, and proposes a method for determining a D-STATCOM comprehensive optimization configuration scheme for large-scale power grids. Background technique [0002] With the preliminary formation of the 500KV strong grid structure of my country's power grid, most provincial power grids have completed the transition from the electromagnetic ring network mode at the 220KV voltage level to the layered partition mode, and the grid structure of each partition is relatively stable, which gives the load The reactive power compensation planning on the side brings favorable factors. At present, theoretically, it is more appropriate to use transient or dynamic analysis methods to determine the installation location of dynamic reactive power compensation devices, but such methods are still difficult to give very accurate limit boundary values, and most of them have research limi...

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Problems solved by technology

However, the optimal configuration of reactive power compensation devices is one-sided, no matter which of the above two aspects is used to obtain a configuration plan for a single optimization goal, and it is not a global optimal result.

Moreover, the stability of the power system is essentially a dynamic issue, and it is difficult for static analysis methods to reflect the actual dynamic process of each component of the system. Therefore, some scholars propose to use the method of tracking the Davidland equivalent parameters, similar to dynamically updating the static equivalent parameters of the system, to a certain extent. The accuracy of the analysis has been improved, but it is still difficult to achieve a comprehensive, accurate and fast optimization goal.

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