Abstract:

This paper proposes an improved continuous power flow （CPF） algorithm by combining the complete Jacobian matrix and the fast-decoupled continuous power flow （FDCPF）. In the algorithm, the tangent vector is calculated by taking the complete Jacobian matrix as the coefficient matrix, thus improving the accuracy of the tangent vector. Moreover, the FDCPF is applied to the calculation of initial power flow and the correction steps. As compared with the Newton-based CPF method, the proposed algorithm tracks the P- V curve more rapidly and with higher accuracy, and conveniently considers the power limit of the slack generator, which helps to analyze the effects of the power limit on the stability margin, the voltage profiles at the collapse point and the bifurcation type. Numerical simulation is finally performed on IEEE 118-bus and 1416-bus systems to reveal the correctness and effectiveness of the proposed algorithm.

Key words: continuous power flow, fast-decoupled method, generator, power constraint, bifurcation type