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This paper proposes a novel passive hybrid high-voltage DC circuit breaker based on thyristors. A current commutation circuit to turn off the thyristors is designed with elements of relatively low current and voltage ratings. Moreover, voltage balancing strategy is applied to protect the series-connected device.
An improved modulation algorithm is proposed for three-phase face-to-face topology. The algorithm could make the face-to-face dc transformer use 1: 1 ac transformer or omit ac transformer in a wide variable ratio range to reducing the volume of the system. The simulation in MATLAB/Simulink validates the proposed algorithm.
PV systems are influenced by disproportionate impacts on energy production due to mismatch cases frequently. The occurrence of multiple maximum power points (MPPs) adds complexity to the tracking process in different PV systems. However, current Maximum Power Point Tracking (MPPT) techniques exhibit limited performance. This paper introduces an Enhanced simulated annealing (ESA) based GMPPT technique...
Since the photovoltaic power generation, wind power and other distributed power supply are volatile and random, they will affect the stability of the grid frequency. In order to improve the voltage and frequency in micro-grid, the virtual synchronous generator control strategy is proposed for inverter control, which can emulate the behavior of synchronous generator, decrease rate of change of frequency...
Control of power electronic generations is important in microgrids and power systems. Droop control is proposed for reasonable power allocation among different inverters. Moreover, virtual synchronous generator is proposed to improve frequency dynamics in transient state. Therefore, inertia design in VSG is necessary for integrating power electronic generations into grids. Frequency dynamic and stability...
Harmonic power sharing and PCC voltage quality are both important issues for the power quality of islanded microgrids. This paper proposes a new control scheme to deal with those two issues based on controlling the equivalent harmonic impedance of DGs. With the proposed control scheme, harmonic power is shared according to remaining power capacities of DGs and PCC voltage harmonics are effectively...
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