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Entrepreneurship education has gradually seep into the management of the whole process of higher vocational education. In this paper the necessity and the importance of promoting entrepreneurship education is analyzed firstly. Main content of the culture of students' entrepreneurial qualities and ability is elaborated. Combined with the electronic information professional group the entrepreneurship...
The control for a switched reluctance generator (SRG) with three-level power converter to increase output power is presented in this paper. First, the operation conditions and key factors to enhance output power of SRG are proposed. Then a three-level power converter with intermediate freewheeling boosts the magnetizing current and the average current in generation freewheeling region. Accordingly,...
IC wafer image is composed of basic shape, mainly including lines, rectangles, rounds and ellipses. Firstly, this paper analyzes the shape of IC circuit image by the geometry of basic shape. When the images are moved and rotated, the moment has the same feature. Therefore, we can calculate the moment, the barycentric coordinate points and barycentric moment which are invariant in the same image. Secondly,...
On the basis of analyzing the blur images with noise, this paper presents a new segmentation method which is based on the morphology method, fuzzy K-means algorithm and some parts operator of the Canny algorithm. Because of the Canny's good performance on good detection, good localization and only one response to a single edge, we introduce the course of Canny operator that calculating the value and...
The algorithm of fractal dimension and co-occurrence matrices is proposed and is applied to material Vickers hardness image segmentation. Based on the characteristics of the indentation images, this article uses texture features to extract the indentation silhouette from the point view of texture segmentation. We adopt fractal dimension and co-occurrence matrix algorithm to describe the texture characteristics...
The paper studies the intelligent detection system based on TCP/IP protocol and realizes real-time detection based on B/S mode. This article focuses on the real-time problem of the communication system, an also propose an improved algorithm of congestion avoidance based on receiver-driven(CARD). Being different from the RTT algorithm and some traditional algorith, CARD uses one-way delay detecting...
People usually research modulation mode 3 of SVM for matrix converter discussed in this paper. Actually, other different modulation modes of SVM for matrix converter are worth studying. Two novel modulation modes are put forward for matrix converter for the first time in this paper, expanding its modulation modes of SVM. First, SVM for matrix converter is described. Then the 3 modulation modes of...
Due to multilevel matrix converter (MMC) be provided with great power output and high voltage, It be fit for electronic power system. Based on space vector modulation strategy, the stage average model of whole open-loop system which includes supply source, the input side inductance, the multilevel matrix converter and load is established considering capacitance voltages, input side currents and output...
A new AC-DC-AC matrix converter topology based on Zeta circuit is proposed to resolve the problem of low voltage transfer ratio of conventional matrix converter. The basic configuration of the new topology and its fundamental principle are firstly introduced, the analytic expression on the function of voltage transfer ratio and duty cycle is analyzed, and the rationale of double-loop control strategy...
To develop and apply renewable energy, one of the key technologies is that a kind of inverter outputting high quality sinusoid signals to power network is required. This paper proposed a three-phase buck-boost inverter, which can generate a three-phase ac output voltage larger than the dc input one. Its basic configuration is introduced, and the system stability of open-loop is analyzed by constructing...
The combination of matrix converter with direct torque control is a way towards green energy-saving of the world. It has great sense for theory research and good developing future. First, it is analyzed about working principle of matrix converter, the control principle and its realization process of direct torque control for induction machine inverter-based. Then the comprehensive switching control...
Control strategy on double input line-to-line voltages for matrix converter was studied fewer compared with others. The relative theorem and inferences are put forward. That is the general composition rules and expressions of input line current is gotten. The simulated model was setup based on this modulation strategy. The simulated experiments have verified correctness of the theorem and inferences,...
Control strategy on double input line-to-line voltages for matrix converter was studied fewer compared with others. The relative theorem and inferences are put forward. That is the general composition rules and expressions of input line current is gotten. The simulated model was setup based on this modulation strategy. The simulated experiments have verified correctness of the theorem and inferences,...
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