An Adaptive Proper Orthogonal Decomposition Method for Evaluating Variability Bounds of Antenna Responses
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Authors: Zhou, Jinzhu; Wu, Xingfan; Kang, Le; Wang, Mei; Huang, Jin
Abstract
Parameter uncertainties introduced by the manufacturing process will lead to the fluctuation of an actual antenna response. Efficient methods are, thus, required during the design phase to evaluate the variability bounds. This letter proposes an adaptive proper orthogonal decomposition (APOD) method to estimate the variability bounds of the radiation patterns and reflection coefficients of the antenna with uncertain parameters. In this method, a parameterized reduced order model (PROM), as a function of the uncertain parameters, is automatically constructed using a Voronoi diagrams-based multipoint sampling algorithm. Then, the PROM-based Monte Carlo analysis is applied to obtain the variability bounds of the antenna responses. Numerical simulations and experimental tests are conducted, and the results show that the proposed APOD method can obtain comparable accuracy, but achieve a fast speed enhancement, compared with the existing methods.
Topological design and modulation strategy for buck-boost three-level inverters
2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6
Authors: Gao, F.; Teodorescu, R.; Blaabjerg, F.; Loh, P. C.; Vilathgamuwa, D. A.
Abstract
To date, designed topologies for dc-ac inversion with both voltage-buck and boost capabilities are mainly focused on two-level circuitries with extensions to three-level possibilities left nearly unexplored. Contributing to this area of research, this paper presents the design of a number of viable buck-boost three-level inverters that can also support bidirectional power conversion. The proposed front-end circuitry is developed from the Cuk-derived buck-boost two-level inverter, and by using the "alternative phase opposition disposition" (APOD) modulation scheme, the buck-boost three-level inverters can perform distinct five-level line voltage and three-level phase voltage switching by simply controlling the active switches located in the designed voltage boost section of the circuits. As a cost saving option, one active switch can further be removed from the voltage-boost section of the circuits by simply re-routing the gating commands of the remaining switches without influencing the ac output voltage amplitude. To verify the validity of the proposed inverters, Matlab/PLECS simulations were performed before a laboratory prototype was implemented for experimental testing.