Estudo comparativo do desempenho de STATCOM e SVC na Instabilidade Dinâmica de Tensão em Sistemas de Energia Elétrica com Produção Eólica. (Comparative study of STATCOM and SVC performance on Dynamic Voltage Collapse of an Electric Power System with Wind Generation)

Rita Manuela Monteiro Pereira (rmfm@isec.pt)1, Carlos Manuel Machado Ferreira (cmacfer@isec.pt)2, Fernando Maciel Barbosa (fmb@fe.up.pt)3


1Instituto Politécnico de Coimbra, IPC/ISEC
2Instituto Politécnico de Coimbra, IPC/ISEC and INESC Coimbra
3Faculdade de Engenharia da Universidade do Porto (FEUP) and INESC TEC

This paper appears in: Revista IEEE América Latina

Publication Date: March 2014
Volume: 12,   Issue: 2 
ISSN: 1548-0992


Abstract:
One of the major problems of voltage stability is the reactive power limit of the system. Improving the system's reactive power handling capacity via Flexible AC transmission System (FACTS) devices is a solution for prevention of voltage instability. In this paper it is studied the influence of Static Synchronous Compensators (STATCOM) and Static Var Compensators (SVC) in dynamic Voltage Stability during Low Voltage Ride Through (LVRT), in wind farms. The wind turbines are equipped with pitch control coupled with a Fixed Speed Induction Generator (FSIG). Due to the nature of asynchronous operation, system voltage instability of wind farms based on FSIG is largely caused by the excessive reactive power absorption by FSIG after a fault due to the large rotor slip gained during fault. Wind farm models based on FSIG and equipped with either STATCOM or SVC are developed in EUROSTAG. The Automatic Voltage Regulators (AVR) of the generating units and the turbine speed governors were modeled in detail. Different load models were used and the Under Load Tap Changers (ULTC) were also taken into account. Finally, some conclusions that provide a better understanding of the dynamic voltage stability of a system with FSIG model during LVRT, using various capacities of STATCOM and SVC are pointed out.

Index Terms:
Electric power systems, STATCOM, SVC, Voltage Stability, Wind Generation   


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