This paper introduces advanced SVC. Advanced SVC has been simulated with regard to reactive power and unbalancy compensation. Then, a new space has been chosen for state equation based on combination of d-q and real space to positive negative. By decoupling of active, reactive powers and positive, negative sequences and using decoupling circuit, the facility of each sequence control, by control circuit will be provided independently. After advanced SVC modeling, the load which is electrification railway system will be simulated. So a sample of electric locomotive in Iran has been investigated and simulated. By using the load model, the advanced SVC has been used for compensation of reactive power, and unbalancy. For more accurate results, the advanced SVC has been investigated during unbalancy and reactive power compensation of the electric locomotive. The results reveal the ability of advanced SVC for simultaneous compensation of reactive power and unbalancy.
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