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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...
This paper presents a new method for operating microgrid. Basic control methodology is to de-couple PQ control for grid-forming distributed generator (DG) whose new extra role is to act as reactive power sensor besides generating real power into the microgrid. Reactive power from the grid-forming DG is transferred to and from the instantaneous var compensator when there is a switch-in or switch-off...
Grid-forming generator is of paramount importance in the operation of an islanded microgrid. A fault in it without proper remedy could lead to collapse of the whole microgrid system. In this paper, besides a main grid-forming generator, a standby backup grid-forming generator is adopted in the system to prevent this from happening. Under no fault condition, the main grid-forming generator takes de-coupled...
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...
In this paper, integration of solar panel based renewable energy distributed generation (DG) with conventional diesel-engine generator in a microgrid has been studied in both grid-connected and islanded modes. Besides solar energy based DG and diesel generator, a grid-forming and a grid-supporting distributed generators are also included in the microgrid. The grid-forming DG adopts constant frequency...
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...
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