Injected Voltage Control of the DVR using a New Hybrid Adaptive Controller in Compensating Network Faults

In this paper, two new hybrid controllers and a new control approach are presented to control the injected voltage of the DVR. In the initial control stages, the improved fuzzy type-2 principles are used to estimate the nonlinearities online. Thus, using this type of controller, the applied disturbances and the nonlinearities are modeled and compensated. Moreover, the fuzzy type-2 controller is designed in a manner so that it adapts its structure to the environments conditions which decreases the calculation burden. In the second phase, to decrease the calculation burden furthermore, a new controller replaces the fuzzy controller. This controller, by combining principles of variable structure control with conventional linear control, apart from shaping the system dynamics, will result in a soft and smooth operation. Moreover, in the new approach, the load current is used to control the load voltage, leading to reduction of burden on protective devices. The system stability is also confirmed using lyapunov’s stability criterion in compensating all symmetrical and unsymmetrical faults. Simulation results confirm the applicability of this controller using this approach.