Coordinated optimization method for power system stabilizer to improve transmission capacity of multiple small hydropower groups

Abstract

The invention provides a power system stabilizer (PSS) coordinative optimization method for improving the transporting capabilities of multiple small hydropower stations. The method includes the following steps: 1) through transient-state stable time-domain simulation, determining dominant low-frequency oscillation modes restraining the transporting capabilities of the small hydropower stations; 2) through small-interference-stability frequency domain scanning, determining generator sets which take part in the dominant low-frequency oscillation modes; 3) through comprehensive index calculation, determining a set which takes part in PSS parameter optimization; 4) targeting at improving the damping of the dominant oscillation modes of the small hydropower stations, carrying out set PSS parameter coordinative optimization; 5) through the transient stable time-domain simulation, evaluating the improving effect of the transporting capabilities of the small hydropower stations. The PSS coordinative optimization method for improving the transporting capabilities of the multiple small hydropower stations is capable of improving a low-frequency oscillation damping characteristic of a plurality of small hydropower stations during concentrated transportation and improving the transportation capabilities of the plurality of small hydropower stations.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a method for coordinating and optimizing power system stabilizers for improving the sending capacity of multiple small hydropower groups. Background technique [0002] my country's small hydropower resources are very rich, and the small hydropower stations that have been built account for about 30% of the installed capacity and annual power generation of hydropower. Small hydropower resources are mainly concentrated in the western region. In areas rich in small hydropower, radial connections are often used to gradually collect them at high voltage levels, forming a situation in which multiple small hydropower groups are collected and sent out in a centralized manner. Because areas rich in small hydropower are generally far away from the load center and weakly connected to the power grid, the transmission capacity of small hydropower groups is mainly restricted by...

AI Technical Summary

Problems solved by technology

When multiple small hydropower clusters are sent out, the unit may participate in multiple different oscillation modes. The traditional PSS parameters are generally only designed for the oscillation of the unit to the regional power grid, which has certain limitations.

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