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With the advanced technology of power electronics and the increasing load demand in modern power systems, it is possibly necessary to have multiple STATCOM (static compensator) units in physical proximity to share the work burden and to tackle emergencies too. Then there is a possibility that these STATCOMs may interact in an undesired way, which could drive the system into unwanted oscillations and...
To address the generation uncertainty problems introduced by renewable energy power plants, STATCOMs are a typical solution to smoothen the point of common coupling (PCC) voltage in order to facilitate the integration of the renewables. A recently proposed control method — virtual synchronous machine (VSM), which controls grid-interfaced inverters to behave like synchronous machines so as to be more...
Because renewable energy sources are environment-friendly and inexhaustible, more and more said renewable energy power plants have been integrated into power grids worldwide. To compensate for their inherent variability, STATCOMs are typically installed at the point of common coupling (PCC) to help their operation by regulating the PCC voltage. However under different contingencies, PCC voltage fluctuations...
It is well known that single-phase ac/dc converter requires big output capacitor to filter the input ripple power from the grid. To interface a dc nanogrid to a single-phase utility, bidirectional power flow and small dc side output voltage ripple are also necessary. By cascading a full-bridge ac/dc converter with a bidirectional buck converter, a two-stage ac/dc topology is adopted to reduce the...
Stability is a great concern for power systems with relatively small sources and multiple regulated power converters. Addressing this need, this paper presents the experimental verification of the Generalized Nyquist stability Criterion (GNC) for balanced three-phase ac systems. This criterion, developed by MacFarlane and Postlethwaite in the 1970's, was proposed as a stability analysis tool for ac...
This paper presents a complete design methodology for the sensorless vector control of permanent-magnet synchronous machine (PMSM) motor drives in fan-type applications. The proposed strategy is built over a linear asymptotic state observer used to estimate the PMSM back EMF and a novel tracking controller based on a phase-locked loop system, which, by synchronizing the estimated and actual ...
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