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Grid-connected inverters are the interfaces for renewable energy sources into the active distribution networks. Usually typical grid-connected inverters use pulse width modulation control, resulting in the grid currents contain a lot of high-order harmonics. Traditionally, grid-connected inverters use L filter to eliminate the harmonics. And in grid-connected inverters' AC side, it uses LCL filter...
Due to the online computational complexity, constrained model predictive control (MPC) is difficult to be applied to the systems which should be sampled with high frequency. This paper proposes a multi-rate high-speed predictive control algorithm (SMHPC) to apply MPC algorithm to this kind of system. The proposed algorithm includes two-layer controller, the upper part is responsible for solving the...
In order to effectively solve the uncertainty small-samples fault diagnosis problem, a practical data-driven grey-based fault detection and diagnosis (FDD) method for complex equipments is investigated. Firstly, an improved fuzzy-grey relational analysis (FGRA) technique is proposed by introducing dynamic identification coefficient and fuzzy relational weight. Compared with the traditional Deng's...
The inconsistent diagnostic information often occurs in fault diagnosis of complex equipments. In order to improve the diagnosis precision, an integrated fault diagnosis method is proposed based on variable precision rough set (VPRS) and Naive Bayesian network classifier (NBNC). Firstly, according to the relative discernibility of the original fault diagnosis decision table, the β in VPRS is self-determined...
To find the changes of surface compositions during life time of the Scandia-doped impregnated dispenser cathodes, two cathodes have been tested at an activation temperature of 1150°CB-Mo and an operation temperature of 1000°CB-Mo, respectively, in an AES system up to more than 7,000 hours. Surface compositions were monitored in-situ at intervals. The tested results have been reported and discussed...
Conventional methods for safety analysis have problems in terms of correctness and efficiency. Using formal methods and fault injection techniques can improve consistency and correctness for safety process throughout the system's safety lifecycle. Yet existed methods for fault injection and safety analysis mainly think about single faults injection for system, seldom do with fault injection for multiple...
The scandia doped tungsten powders have been obtained by a new method of spray drying combined with two-step reduction in hydrogen atmosphere. Based on the powders, the cathode impregnated with 612 aluminates (SDI-612) has excellent emission capability of 72.2A/cm2 at 900oCb, moreover, the SDI-612 cathode has a lower evaporation rate of 8.45∗10−9g.cm−2s−1 at 1150oCb.
Early childhood education is much more important in our society. It is difficult to pick a good school because now parents have more choices, especially because there are schools all over Taiwan. In past research, we cannot find a direct method that helped parents choose quality school. Hence, the main purpose of this study is to analyze the influence factor for kindergarten, and give suggestions...
The restricted coexistence as an accumulated status or an idea can be used to explain why so-called Ramsey's effects or phenomena exist. From this, some properties, for instance, for all integers q≥ p≥3, a deep inequality R(p, q) ≥ R(p -1, q + 2), are proved, based on coherence of Ramsey's phenomena and the viewpoint of accumulated quantity. Further by known data,...
A fair non-repudiation security protocol can provide non-repudiation proof for two parts of the exchange at the same time, or both get nothing. But many protocols performed weak in logical analysis. In this paper, a group of new protocols(with 3 sub-protocols) with off-line The Third Party(TTP) are presented. We analysis them with a new Kailar logic analytical method. Finally, the proposed protocols...
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