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This paper proposes a general seamless control scheme of inverter for the purpose of ship-to-shore connection by means of active islanding detection method. In the proposed system, the Sandia Frequency Shift (SFS) method combined with a frequency protection scheme is used to detect the islanding instant. The SFS parameter selection is performed using a new phase criterion proposed in the literature...
In this paper, we present a potential distributed adaptive control architecture applied to a zonal medium voltage DC (MVDC) ship power systems. The power sharing in the MVDC network among distributed generators will be presented first. Second, the active and reactive power sharing among zones in the low voltage AC (LVAC) network will be addressed. The effect of control in LVAC network on the MVDC...
This paper presents an application of combined model reference adaptive control to a notional DC microgrid system for power sharing and bus voltage regulation. The algorithm is presented in detail and a brief stability analysis is provided. Then, the control algorithm is implemented on a two-converter system feeding a single load through a bus to demonstrate the current sharing accuracy and bus voltage...
In this paper, we address the control design problem under the system's model uncertainty utilizing the adaptive control. First, the adaptive control based on the model reference adaptive control technique is presented. Subsequently, the adaptive control technique is applied to a multi-converter system to guarantee the bus-voltage stability and accurate current sharing. Simulation in MATLAB/Simulink...
Regarding the safety and reliable operation of modern distributed generation (DG) systems, an expert diagnosis apparatus is required to distinguish between different events. One of the crucial requirements in DG safe operation is the “islanding detection.” In this paper, a new passive islanding detection method, based on the application of the Duffing oscillators, is suggested for the first time and...
DC-DC Converters widely used in regulated switch mode power supplies and in dc motor drive applications. Often the input to these converters is an unregulated dc voltage and therefore it will fluctuate due to changes in Line-Voltage magnitude. In this paper the PID controller has been used to overcome this problem. The controller parameters are optimized by using the Bacterial Foraging Algorithm (BFA)...
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