Визначення вагових коефіцієнтів системи керування симетро-компенсувальним пристроєм з використанням апарату нечіткої логіки

This study investigates processes of automatic control over parameters of the distribution network mode at a voltage of 6–10 kV with a sharply changing asymmetric load. The task addressed relates to the compromised efficiency of existing systems for automatic control over symmetry-compensating devices, which are based on multi-criteria optimization methods with unchanged weight coefficients. Such systems continue to give maximum priority to reducing the steady-state voltage deviation even if it meets regulatory requirements. This leads to incomplete utilization of regulating reserve of the symmetry-compensating device. The system of automatic control over the symmetry-compensating device has been improved by integrating a fuzzy controller into its structure. This controller changes the values of weight coefficients in the objective function depending on the current values of the network mode parameters. The computer simulation has confirmed the effectiveness of the designed system, which provided a reduction in the mathematical expectations of the reactive power factor M[tanφ] by 13.9% and the voltage unbalance factor M[k2U] by 8.5% compared to the baseline. The increase in the efficiency of the control system is explained by its ability to adaptively change the weight coefficients. Thus, if there is a margin for the steady-state voltage deviation, the fuzzy controller reduces the weight coefficient that meets this criterion, directing the regulating resource of the symmetrical-compensating device to increase the level of reactive power compensation and reduce the level of asymmetry. A feature of the designed control system is the use of the levels of approximation of the current values of the steady-state deviation and voltage asymmetry to their regulatory permissible limits as input variables in the fuzzy controller. The designed automatic control system could be used in distribution electrical networks with a voltage of 6–10 kV at a sharply changing asymmetrical load