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This paper presents a method to shed off the least important loads in a microgrid operated at constant frequency under the contingency of inadequate power generation. Different from conventional frequency deviation based load shedding, this paper discusses in detail how to shed off load based on the voltage deviation. The key issue is to differentiate whether the voltage deviation is due to sudden...
With the advancements in power electronics technologies and the momentum towards intelligent electrical energy management, there is an increasing demand for power grids to have additional functions. Solid-state transformer (SST) is a new type of power converter that is employed in microgrids to achieve miniaturisation and promising performance. It comprises an isolated DC-DC converter with planar...
This paper presents a method for modeling the variation of inductance by biasing the magnetic field in the core using an applied DC current. The technique uses the Jiles-Atherton model. Both low current and high current cases are modeled. For the high current application, an air-gap needs be introduced to avoid saturation. A controllable variable inductance model is built in Matlab/Simulink and is...
In this paper study on solid-state medium-frequency transformer isolated substation is modeled in detail. The substation is formed by AC/DC rectifier, six-pulse DC/AC inverter, high-frequency transformer, DC/AC six-diode rectifier and DC/AC inverter. Both AC/DC rectifier at high AC grid-1 side and DC/AC inverter at lower grid-2 side are controlled by proportional resonant controller and are interfaced...
Microgrid with multiple grid-connected inverters produces abundant harmonic voltage and current components. Such harmonics make it difficult to extract fundamental component and other useful components. Accurate yet time-efficient algorithm is in high demand to solve this problem not only for producing accurate reference signals but also for fulfilling effective control and event detection in microgrid...
This paper presents an autonomous operation of a micro-grid by employing a droop control and PQ control strategy. The local distributed generation (DG) is modeled by a grid-tied inverter with LCL filter. A proportional-resonant controller is adopted to control the inverter. A new control scheme based on a combination of weak droop control and PQ control is proposed in this paper. Droop control aims...
This paper presents a design and optimization method to harness wind energy using PMSG, diode rectifier, boost DC/DC converter and grid-connected VSI DC/AC inverter with LCL filter. A systematic procedure has been adopted to design the system to extract maximum power for a given wind speed. The design methodology has been verified by Simulink based platform. The system operates up to its design target,...
In this paper differential evolution algorithm has been adopted to identify a suitable set of values of L-C-L filter used in a grid-tied voltage source inverter to meet total harmonic distortion (THD) requirement. A single-phase circuit model with virtual equivalent impedance of inverter output power was used to analyze total harmonic distortion. This paper also adopted a combination of partial direct-pole-placement...
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