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An Equivalent Current Injection (ECI) based Security-Constrained Optimal Power Flow (SCOPF) is presented in this paper and a Multiple Particle Swarm Optimization (MPSO) is developed for solving non-convex Optimal Power Flow problem. The OPF deals with both continuous and discrete control variables and is a mixed-integer OPF. The continuous control variables modeled are the active power output and...
This paper presents preventive security-constrained optimal power flow (PSCOPF) with hybrid genetic-ant colony optimization (HGACO) is presented The PSCOPF can be divided into three steps involving security analysis, severest event selection, and preventive algorithm. First, Novel security analysis will be conducted before fault occurred in the system by current-based power flow technique. Second,...
This paper presents a modified particle swarm optimization (MPSO) for the solution of the optimal power flow (OPF) with both continuous and discrete control variables that was called non-continuous optimal power flow (NCOPF). The continuous control variables modeled are unit active power outputs and generator-bus voltage magnitudes for traditional OPF, while the discrete ones are transformer-tap settings...
This paper presents a hybrid programming (HP) technique to solve the dc microgrid reconfiguration problem for loss reduction and service restoration. By using the proposed algorithm, a more efficient network configuration can be obtained to reduce loss. The problem is optimized in a stochastic searching manner similar to that of the evolutionary programming (EP). The initial population is determined...
Voltage security is a crucial issue in power systems especially under heavily loaded condition. In the new scheme of restructuring, voltage stability problem becomes even more serious. To solve the problem, we integrate reactive power compensation concept by static synchronous compensator (STATCOM) with equivalent-current injection (ECI). We derive a new STATCOM with ECI model. This paper shows the...
An equivalent current injection (ECI) based hybrid current-power optimal power flow (OPF) model is proposed in this paper and the predictor-corrector interior point algorithm (PCIPA) is tailored to fit the OPF for solving nonlinear programming (NLP) problems. The proposed method can further decompose into two sub-problems. The computational results of IEEE 9 to 300 buses have shown that the proposed...
An equivalent current injection (ECI)-based hybrid current-power optimal power flow (OPF) model is proposed in this paper, and the predictor-corrector interior point algorithm (PCIPA) is tailored to fit the OPF for solving nonlinear programming (NLP) problems. The proposed method can further decompose into two subproblems. The computational results of IEEE 9 to 300 buses have shown that the proposed...
This paper presents a current-based optimal power flow (OPF) with predictor-corrector interior point algorithm (PCIPA). The distinctive features of this OPF formulation are: i) the elements of Hessian matrix are all real, ii) the objective function and constraints are quadratic functions and such quadratic properties are explored in the development of a robust nonlinear OPF solution procedure. This...
This paper presents emergency operation strategy for power system restoration using grey relational analysis (GRA). The restoration scheme can be divided into fault section detection (FSD) and restoration strategy (RS). Two GRAs are used to design the overall restoration scheme. The first GRA is used for on-off switching states to identify fault section. The second GRA is for combining switching states...
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