Dynamic load model and its incorporation in MATLAB based Voltage Stability Toolbox

摘要

Economical system expansion strategies and reliable system operation, requires comprehensive system simulation studies. For this various simulation tools are available, which use static load models. This paper deals with the impact of load modelling on the validity of power system studies mainly concentrating on voltage stability. VST toolbox of MATLAB is a powerful tool and is convenient to use. This is used for load flow, small signal stability, transient stability and voltage stability analysis. Presently static load model is considered for all these analysis. However static load models are not accurate enough for capturing the dynamics of network. So inclusion of dynamic load model instead of static load model in the VST for various analysis is presented in this paper. For determining the dynamic load parameters, measurement based approach is preferred due to its numerous advantages over the component based approach. Sweden based measurement data with large disturbance voltage variations is used for determination of dynamic load model parameters. In place of static load model, dynamic load model is included in the VST. Voltage stability analysis is carried out on standard IEEE 14 Bus system with VST including static load model and dynamic load model. Voltage collapse points on PV curve of test system in both the cases are compared under various conditions with different dynamic load parameters. The paper presents a methodology of implementation of dynamic load modelling in voltage stability toolbox for large disturbance voltage stability studies.