OPTIMAL CHOICE OF FIXED AND SWITCHED CAPACITORS IN RADIAL DISTRIBUTORS WITH DISTORTED SUBSTATION VOLTAGE

The problem of optimal choice of fixed and switched capacitors in radi al distributors with distorted substation voltages is formulated and s olved by decomposition through isolated subproblems. The maximum sensi tivities selection (MSS) method, which is used to solve the optimisati on problem of the subproblems with discrete variables, is proposed. Th e results of a test distributor show that harmonic voltages in the sub station voltage affects the capacitance of the optimal shunt capacitor s. By combining system harmonic forecasting with the method in this pa per, the harmonics amplification due to shunt capacitors can be reduce d to the minimum level.