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This paper proposes an active damping method for LCL filters of grid-connected converters. LCL filters are mainly utilized for the interface of distributed generation systems to the grid due to their small size and effectiveness of current harmonics attenuation. However, owing to the resonance of LCL filters, bandwidth of the current controller of the converters is usually limited far to the resonant...
In this paper, a bilateral reactive power injection method is proposed for islanding detection of grid-connected converters in distributed generation units. The proposed method injects capacitive and inductive reactive power periodically with half of the grid frequency to perturb the frequency of point of common coupling (PCC). The magnitude of the injected reactive power is derived in order to remove...
This paper describe a design method of an LCL filter for the three-phase two-level voltage-source PWM converters. The grid current harmonics regulation is the primary condition for the operation of the grid-connected converters to satisfy. If the grid voltage is assumed to be ideally sinusoidal, PWM switching is the only factor to produce harmonics on the grid current, especially around the bands...
This paper proposes a control strategy of an active front end (AFE) rectifier to cope with voltage deviation at the shipboard AC-power system. The voltage sags in naval ships may occur when the step load such as a large pulse power weapon is applied or when faults happen in the grid or generators themselves. In this paper, the capability of AFEs to support voltage is presented for the voltage sags...
In this paper, a reactive power sharing method is proposed for the operation of multiple distributed generation units. When the line impedance is unbalanced, accurate reactive power sharing is challenging with conventional current sharing or droop control strategies. This paper describes the effect of the unequal line impedances on the reactive power sharing accuracy, especially for mainly inductive...
Korean navy is now investigating how new naval destroyer can be designed by Integrated Full Electric Propulsion (IFEP) system. The operating cost of the electric propulsion system is smaller than that of the mechanical propulsion system. However, the existing IFEP system is still spending an enormous fuel due to Navy's conservative operating concept-Dual Generator Operation-for higher reliability...
This paper deals with an LCL filter for the grid-connected converter. Active and passive damping methods are compared in a resonance suppression point of view and necessity of the passive damping is claimed, especially for high power systems in which switching frequency is limited lower than 2.5 kHz. Based on the analysis, LCL filter design procedure with passive damping for a two level voltage source...
This paper describes boundary conditions for phase current reconstruction of a three current-shunt inverter and suggests a voltage injection method to expand the measurable areas. The boundary conditions are derived on voltage vector plane for symmetric space vector PWM. For the expansion of the areas, different voltages are injected depending on the position of the voltage vector with double sampling...
This paper describes LCL filter design and control for grid-connected PWM converter. To attenuate switching harmonics on grid side with an LCL filter, cost-effectiveness must be considered to select filter parameters. This paper proposes a filter design method based on a computer simulation tool. Depending on user's optimal cost function, filter parameters are chosen without tedious and repetitive...
This paper deals with a separate double-winding 12-phase BLDC motor fed from individual H-bridge inverters. The system is fault tolerant in that continuous operation is possible under fault conditions. Every phase is electrically independent from each other and doubly wound to intensify the redundancy of the system. Furthermore, each phase is asymmetrically 15 degrees apart to have the same torque...
This paper presents a new power flow control strategy for a variable speed engine-generator based series hybrid electric vehicle. The specific fuel consumption map of the internal combustion engine (ICE) has been obtained by off-line experiments to achieve optimal fuel efficiency. The proposed power flow controller makes it possible that the ICE operates at its optimal fuel efficiency points without...
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