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Time Domain Reflectometry (TDR) has been introduced into the design of X-band tile Transmit/Receive (T/R) modules fabricated with Low Temperature Co-fired Ceramics (LTCC) processing. TDR simulation exhibits additional capability compared with S-parameter simulation, especially in the aspect of vertical interconnection scheme. Vertical quasi-coax interconnection and wire bonding schemes have been explored...
This paper describes a modified phase-shifted carrier-based pulsewidth-modulation (PSC-PWM) scheme for modular multilevel converters (MMC). In order to reduce the average device switching frequency, a reduced switching-frequency (RSF) voltage balancing algorithm is developed. This paper also proposes a circulating current suppressing controller (CCSC) to minimize the inner circulating current in an...
The Extended Kalman Filter (EKF) algorithm is easy to be affected by the initial state value and the pseudo linear equation based algorithm will result in biased solution. A new asymptotically unbiased location and tracking algorithm with bearings-only measurements by two stations is proposed to solve these problems. The proposed algorithm introduces the correlation matrix of the observation error...
This paper describes two distinctive functions of the arm inductor in the modular multilevel converters (MMC): suppressing the circulating current and limiting the fault current rise rate. Based on the equality of the instantaneous power, the characteristics of the circulating current are analyzed and demonstrated that it flows through the three phase of the converter in negative sequence at double-fundamental...
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