Abstract
At present, the common practice in the power system of China is to represent the small and medium hydropower generator group as a negative load. This paper presents a method to build a dynamic equivalent model of the hydropower generator group using a 3rd order generator model and a static characteristic load model. Based on phasor measurements in the tie line which connects to the modeled hydropower generator group, the dynamic multi-swarm particle swarm optimizer (DMS-PSO) algorithm is used to obtain parameters of the equivalent model. The proposed method is verified in the small and medium hydropower generator group of Sichuan power grid with both simulation and actual data. The results show that the dynamic responses and the transient stability are consistent before and after the equivalence. The proposed method can be used for modeling a group of small and medium hydropower generators whose structures and parameters are unknown.
Highlights
IntroductionThere are a large number of small and medium hydropower generators in abundant water resources areas because they are flexible, convenient and environmentally-friendly energy sources
There are a large number of small and medium hydropower generators in abundant water resources areas because they are flexible, convenient and environmentally-friendly energy sources.If the region contains a lot of small and medium hydropower stations, the dynamic performance of the power system must be affected by the hydropower generator group
The performances of different dynamic equivalent models are analyzed in [20], and the results show that the 3rd order generator model is good enough for accurate equivalence since the optimization time greatly increased with the 5th order generator model without improving accuracy significantly
Summary
There are a large number of small and medium hydropower generators in abundant water resources areas because they are flexible, convenient and environmentally-friendly energy sources. There is little research on dynamic equivalence for the small and the process of calculating the equivalent model parameters so that the results are medium generator group method based on theThe estimation-based equivalent method It nothydropower accurate enough as a nonlinear [17]. A measurement-based method for system dynamic equivalence is for proposed to small and medium hydropower generator group based on the estimation‐based equivalent method. On hydropower the tie line phasor measurements, construct the dynamic equivalent model for a small andBased medium generator group parameters the equivalent model obtained combining nonlinear orderdynamic. Based on the tie line phasor method is verified in the small and medium hydropower generator group of Sichuan power grid with measurements, parameters of the equivalent model are obtained by combining nonlinear 4th order both simulation and actual data.
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