Método da continuação aplicado na análise de contingência de linhas de transmissão

Abstract

RESUMOEste trabalho apresenta um método para a análise estática de contingências em Sistemas Elétricos de Potência utilizando o Método da Continuação. A margem de carregamento pós-contingência é obtida a partir do ponto de máximo carregamento do caso base. A magnitude de tensão de uma barra qualquer é usada como parâmetro na etapa de parametrização do fluxo de carga continuado. O ramo selecionado para avaliação da contingência é parametrizado por um fator de escalonamento que possibilita a remoção gradual do ramo e assegura a convergência nos casos em que o método diverge para a retirada total da linha de transmissão. Em geral, para a maioria das contingências analisadas são necessárias poucas iterações para a determinação do ponto de máximo carregamento pós-contingência. Mostra-se que o método pode ser usado como uma técnica alternativa para a averiguação e até mesmo para a obtenção da lista de contingências críticas fornecida pela função de análise de segurança de sistemas elétricos. ABSTRACTThis work presents a new methodology for static contingency analysis of electric power systems by using Continuation Methods. The post-contingency loading margin is obtained from the base case maximum loading point. The voltage magnitude of any bus can be used as a parameter in the parameterization step of the proposed continuation power flow. The branch selected for contingency evaluation is parameterized by a scaling factor which allows its the gradual removal and assures the continuation power flow convergence for the cases where the method would diverge for the complete transmission line removal. In general, for most of the analyzed contingencies little iterations are necessary for the determination of the post-contingency maximum loading point. It is shown that the method can be used as an alternative technique to verify and even to obtain the list of critical contingencies supplied by the electric power systems security analysis function.

Evaluation of Voltage Variations Arising from the Increase in Photovoltaic Insertion in the Transmission Network: Case Study Coremas-PB Power Plant

“…Static methods are based on the analysis of the systems of algebraic equations obtained from the power flow model. Dynamic methods, in general, are based on the time solutions of the systems of differential and algebraic equations representing the dynamic performance of system components [14,17,21].…”

“…Although the phenomenon of voltage instability is essentially dynamic, static methods are important for their computational efficiency and for the information they produce regarding sensitivities, degrees of instability and stability margins. Static methods are suitable for studies related to instability caused by small disturbances, in which the main objective is to determine the maximum limits of the power transfer and reinforcements in the support of reactives, in order to increase these limits [14,17,21].…”

“…Transmission lines (LT) have four parameters that play an important role in their operation and, consequently, in the energy transport capacity. These parameters are resistance (R), series reactance (X), conductance (G), and shunt susceptance (B) [5,14,27]. However, conductance is usually neglected, since its effect on the line is considered very small in relation to that of the other parameters [5,17].…”

“…So, stochastic intermittency, for example, the passage of a cloud, causes effects on the electricity transmission parameters of the electrical system. Another driving factor in the challenge to realize all solar PV energy is the need to accommodate the changing net load (normal load minus variable solar source generation) associated with high midday PV generation and the low-electricity-demand duck curve [12][13][14].…”