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This paper presents a coil model of circuit breaker using MATLAB/Simulink and proposes a weighted morphological filter with dual structuring elements (SEs) to process the coil current of the circuit breaker. In order to make sure that the Simulink model of the trip and close coil is accurate enough, the genetic algorithm (GA) is applied to optimize its parameters, targeting the minimum difference...
This brief presents a switching control scheme (SCS) based on the energy conservation principle for buck converters. The concept of the SCS is based on the conservation of energy in circuit. It keeps the balance between the energy that is injected into a circuit and the sum of the energy that is consumed by the load and stored in reactive components. The SCS not only regulates the output voltage of...
With the increasing penetration of distributed generation (DG) systems based on renewable energies into the power grid, the fault ride-through capability of them is stressed by recent grid codes. Aiming to adapting this requirement, this paper proposes a voltage sensorless predictive direct power control (PDPC) for the grid-interactive DC/AC converter utilized in DG systems. In order to realize a...
In this paper, a novel predictive direct power control (PDPC) strategy is proposed for three-phase AC/DC converters, which is based on a straightforward regulation of instantaneous active and reactive power. The converter controlled by the proposed strategy realizes operations without line-side voltage sensors by introducing the virtual flux (VF) concept and a grid voltage estimation method based...
The conventional one-cycle control (OCC) technique requires the integrator to reset instantaneously. However, it is very difficult to realize by hardware due to the finite time constant of a reset circuitry, which loads to a large DC offset in the output voltage. Therefore, the paper presents a new control scheme to resolve the problem, which is based on considering a singlephase full-bridge inverter...
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