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In this paper, an enhanced power sharing strategy employing adaptive virtual impedances for Q-ω and P-V droop-based islanded microgrids (MGs) is proposed. The proposed scheme improves the performance of dynamic response and system stability while accurate power sharing is obtained. The low-bandwidth communication is utilized to send the power commands. The adaptive virtual impedances consist of a...
In this paper, a practical core loss calculation method based on the modified Steinmetz equation is proposed. It calculates the low-frequency losses and the high-frequency losses separately. By utilizing the curves of permeability versus DC bias provided by core vendors instead of plenty tests, the paper establishes a relation between the DC bias and the core losses. A novel model of minor loops is...
In this paper, a wireless current sharing Scheme for paralleled online uninterruptible power system (UPS) inverters is proposed, based on which effective power sharing under phase locking condition and fast dynamic response of sharing load are obtained. The output impedance of UPS inverter is designed to be resistive, and the droop method based on resistive output impedance is employed. Moreover,...
The grid-connected VSC system with LCL filter has resonance problems which will magnify the harmonics near the resonant frequency and result in a low stability margin and complex design of current regulators. In this paper, a novel control strategy is proposed by introducing the feedforward compensatory controls of state variables and grid voltage, which can not only lessen the system order from the...
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