Cluster equivalent modeling method for small and medium size hydroelectric generating sets

Abstract

The invention discloses a cluster equivalent modeling method for small and medium size hydroelectric generating sets, and belongs to the field of cluster modeling and equivalent analysis of the hydroelectric generating sets. The method includes the steps of firstly, conducting regional division on a power grid, and establishing hydroelectric generating set-load equivalent models including the parallel connection PID speed controller model, the water diversion system elastic water attack model, the six-parameter water turbine model based on a comprehensive characteristic curve and the three-order practical electric generator model; secondly, recognizing equivalent hydroelectric generator model parameters and load model parameters through the parallel particle swarm optimization which is put forward. The obtained equivalent models meet the refined modeling requirements of the hydroelectric energy system simulation, the electric power system analysis and the dispatching and operation calculation to a larger extent.

Description

technical field [0001] The invention belongs to the technical field of cluster modeling and equivalent analysis of hydroelectric generating sets in electric power systems, and more particularly relates to a cluster equivalent modeling method for small and medium-sized hydraulic generating sets. Background technique [0002] With the construction of small and medium-sized hydropower stations in areas rich in hydropower resources in my country, small and medium-sized hydropower stations are connected to the power grid as a cluster of distributed power sources. big. In the power system stability analysis, in order to avoid the time-consuming calculation and analysis and the "dimension disaster" problems that exist when each small and medium-sized hydropower unit is modeled separately, the fleet of small and medium-sized hydropower units is generally simplified by equivalent value. However, the traditional method ignores the influence of the elastic water hammer characteristics ...

AI Technical Summary

Problems solved by technology

However, the relevant research and application of power system equivalents have not fully considered the influence of the characteristics of the turbine speed control system

In the research and application of the coherent equivalent method, the equivalent model considers the turbine speed control system model, but the turbine model used is an ideal simplified model, and the water diversion system model is a rigid water hammer model, which cannot accurately reflect the hydraulic pressure of small and medium-sized hydropower units. Influence of shock characteristics and regulating performance of speed regulating system on the dynamic characteristics of power system; in the research and application of identification equivalence, only the synchronous generator-load model is used, and the dynamic effects of governor, prime mover and water diversion system are ignored. This simplified model cannot accurately reflect the influence of the hydroelectric generating unit fleet on the dynamic response process of the power grid, resulting in the inability to achieve the best equivalent effect

Images