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Optimal Power Flow (OPF) concept in the 1960s and 1970s, several blackout occurred because the United States and other developed countries, taking into account the security constrained optimal power flow (SCOPF) attaches great importance to research and practice, now OPF has the basis of the power system control, scheduling, maintenance, planning, decision-making tools, a wide range of application areas. Security Constrained Optimal Power Flow repeatedly involved in the power system scheduling, planning, maintenance and risk assessment correction control (CSCOPF) to solve the problem, is proposed based on in-depth mechanism analysis based on Ben Fernandez (Benders) decomposition and coordination the model and algorithm, solving complex grid to be carried out. First, the characteristics of for CSCOPF model, its constraints into normal state constraints, expected event status under the three types of constraints, and the two coupling constraints between these three types of constraints collection contains relational analysis based on the obtained three relationships between the expected events with the normal state of optimal running mode, provides a theoretical basis for the decomposition algorithm and expected event filtering algorithm. Secondly, using the constraint while Ben Fernandez decomposition idea CSCOPF model decomposition and coordination, Ben Fernandez main processing classification based on the above-mentioned constraints, the constraints under the normal state, Ben Fernandez subproblem processing envisioned event status envisioned coupling relationship between the event state and normal state by Ben Fernandez cutting reflected thereby CSCOPF model is decomposed into a series of OPF model, association information between Ben Fernandez cutting coordination. Again, Ben Fernandez decomposition ideas need to model the formation of sub-problems are expected for each event, many optimization model to solve the large grid is bound to spend a huge amount of computation, while the actual function of expected events accounted for only a small number of expected for many events, the expected event screening screening methods based on the expected event select the dominant event to avoid invalid expected event constraints, reduced the size of the set of sub-problems. Finally, Ben Fernandez decomposition algorithm model formed the main issues and sub-issues are typical of optimal power flow (OPF) model, there are a large number of redundant constraints (ECTE security constraints) model, this paper, based on the selected dominate transmission element method to solve the main problem and sub-problem optimization model, changes in the run mode for the grid to form a minimum set of constraints dominate transmission components, so as to avoid a large number of redundant constraints, improve the efficiency of solution.
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