Vander Menengoy da Costa

Improved representation of control adjustments into the Newton -Raphson power flow

Abstract This paper describes a sparse (4 n ×4 n ) formulation for the solution of power flow problem, comprising 2 n current injection equations written in rectangular coordinates plus the set of control equations. This formulation has the same convergence characteristics of the conventional Newton power flow problem, expressed in terms of power mismatches written in polar coordinates and can be reduced to a (2 n ×2 n ) formulation plus the control equations. It is best suited to the incorporation of flexible AC transmission system devices and controls of any kind. Complex user-defined control functions, involving the participation of several regulating devices, can be directly introduced as power flow control data. The results presented validate the proposed method.

Controle de tensão no fluxo de potência continuado: modelagens e efeitos na estabilidade de tensão

This paper proposes to model both the automatic tap control and the secondary voltage control in the continuation power flow problem, as well as, to evaluate the effects in the voltage stability due to the insertion of these control strategies. Maximum and minimum operative limits of each control device are taken into account. Modal analysis results are utilized in order to identify the system critical buses.

Fluxo de potência continuando via equações de injeção de corrent

This paper proposes the continuation power flow using the current injection formulation in rectangular coordinates. The main advantages of this new approach, as compared with the polar conventional methodology, are mainly due to the Jacobian matrix structure, composed basically by the nodal admittance matrix elements. The simulations carried out using many different test systems, validate the proposed methodology.

Novos desenvolvimentos numa formulação de injeção de corrente para solução do fluxo de potência

This paper presents a generic methodology of control devices representation into the power flow problem, using a sparse Newton Raphson formulation expressed in terms of current injection equations in rectangular coordinates. This formulation yields the same convergence characteristics presented by power mismatches conventional formulation in polar coordinates. The results validate the proposed methodology.

Uma avaliação crítica das formulações de fluxo de potência para sistemas trifásicos via método de newton-raphson

This paper presents a comparative study on convergence characteristics of the main three-phase power flow methods, namely, conventional polar, conventional rectangular and current injection formulations, for solving the three-phase power flow problem. The nonlinear equations are solved iteratively through Newton-Raphson approach. Both unbalanced and ill-conditioned three-phase power systems are tested in order to provide information on performance of each one of the methods under analysis. The convergence characteristics are evaluated by increasing the loading factor and the branch R/X ratios.