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Electrical resonance with the grid is an increasingly common problem for wind turbines and PV inverters, especially those connected to a weak grid. Such resonance problems can usually be solved by modifying turbine or PV inverter control to reshape its output impedance. There are, however, situations where this may not be effective or not feasible at all due to e.g. limitations in turbine design or...
This paper presents sequence impedance modeling and analysis of modular multilevel converters (MMC) in a single-star configuration for Static VAR Compensation (STATCOM) application. Prior work on impedance modeling of MMC has focused on the double-star configuration for high-voltage dc (HVDC) transmission applications. In the single-star configuration, each phase uses only a single arm of switching...
The traditional fundamental harmonic approximation (FHA) method is not applicable any more in high coupling coefficient WPT system. Instead, the harmonic input impedance and currents are derived and analyzed. Soft switching missing phenomenon may occurs when the coupling coefficient is designed to be in the zones (0.89∼0.93), and (0.99∼1). Simple serial-connected LC filters are introduced to correct...
Distributed Generation may be located far away from load centers due to their use of new energy resource distribution characteristics. In this case, Long distance transmission lines will introduce an equivalent impedance to the grid. In this paper, the interaction between grid-connected inverter and high impedance grid is studied by means of impedance-based analysis method. A distributed generation...
Distributed Generation may be located far away from load centers due to their use of new energy resource distribution characteristics. In this case, Long distance transmission lines will introduce an equivalent impedance to the grid, so that the grid showing the characteristics of a weak grid. In this paper, the interaction between LCL-type grid-connected inverter and weak grid is studied by means...
Harmonic resonance involving grid-parallel inverters is becoming a critical issue in power systems with increasing amount of renewable energy and other distributed generation (DG) resources. Such harmonic resonance can occur at the grid interconnect point of individual or multiple grid-parallel solar or wind inverters, and is usually the result of impedance mismatch between the grid and the inverters...
In this paper, a novel miniature discone antenna operated in the ultra-high frequency (UHF) band is presented. The introduction of the back cavity increases the cone angle and reduces the total size. In order to form a back cavity, the bottom of the cone is expanded and bended upward. The size of the discone antenna is reduced effectively. Also the size of the profile is reduced. Through adding short-circuit...
The offset parallel-strip line (PSL) allows another design freedom for characteristic impedance except for strip width, i.e. offset distance between the top and bottom strips of the offset PSL. This can reduce the discontinuities effectively resulting from the change of strip width and improve power-handling capability. The design method is applied successfully in our proposed equal power divider...
The HDMI 1.4a standard does not contain specific terms of 3D video format for DLP TV system. To fill in the blank, authors of this article convert the 3D video format using Altera Cyclone III FPGA device, and build an integrated 3D display system by a diamond DMD. In this display system, the FPGA device, core of video signal processing, with two DDR2 high-speed memories and the DVI interface, convert...
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