Load model of regional power grid with small hydroelectric generating set and modeling method

Abstract

The invention relates to a load model of a regional power grid with a small hydroelectric generating set and a modeling method. Influences of low-voltage release of regional small hydro-electric power plants, distribution networks and induction motors are considered in the load model. By the practical modeling method, a component-based modeling approach and a measurement-based modeling approach are combined. The modeling method comprises the following steps of pre-sorting load nodes by using the component-based modeling approach; describing an equivalent motor by using typical parameters in a corresponding class; acquiring parameters of the equivalent motor by using a coherent equivalence method; reducing parameters to be identified in the load model; and identifying parameters of node measured data by using a genetic algorithm to obtain parameters of the model. Data are acquired by a fault recording device arranged in an electrical power system, node loads only require to be classified roughly, and the improved load model is close to actual conditions. The load model has the advantages that the investment is saved, the working amount is low, the precision of the model is high, and the load model can be directly used in BPA (business process analysis) software. Moreover, the load model can be used for frontline production practice.

Description

technical field [0001] The invention relates to a power system load modeling technology, in particular to a load model and a modeling method of a power grid in an area with a small hydroelectric unit. Background technique [0002] The accuracy of the model structure and parameters of each component in the power system directly affects the accuracy of the power system simulation calculation results. At present, in the power system simulation model, the generator and its excitation and speed control system model, the transformer and the transmission network model such as the line are relatively mature. sexual bottleneck. [0003] The dynamic mechanism model has been widely used in practical engineering because of its clear concept and strong applicability. At present, the dynamic load models in my country's power grids at all levels use a fixed ratio of motors connected in parallel with constant impedance, and most motors use typical parameters. In actual operation, the low...

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Problems solved by technology

[0005] The present invention aims at the problem that the existing power system modeling method is not suitable for modeling regional power grids with agglomeration of small hydropower units, and proposes a load model and modeling method for regional power grids with small hydropower units. The proposed load In the model, the impact of regional small hydropower, distribution network and low voltage release of induction motors is considered

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