AASRI Procedia最新文献

Distributed generation (DG) systems are considered an integral part in future distribution power system. The reactive power injections from DG units, are seen as a cost-effective solution for distribution system voltage support, energy saving, and reliability improvement. This paper proposes a coordinating control method of reactive power optimization in distribution power system with distributed wind energy. The reactive capability limits of doubly fed induction generator (DFIG) are included in the optimization model. The problem of reactive power output/absorb of adjustable compensating capacitor and wind turbine (WT) is formulated as constrained conditions; differential evolution algorithm (DE) integrating depth-first search is developed to effectively obtain optimal solutions. The proposed algorithm is applied to a practical test system and results are compared and presented.

Optimized study to the ratio of primeval ball loading in 4.0 × 6.0m overflow ball Mill of Yingezhuang gold mine, the research results showed that it pertains to low hard and brittle ores, the accurate size ball should be used rather than big size ball due to mainly fines mineral are produced in the process of comminution. As the yield of intermediate granularity between 8 to 0.45 mm reach up to 50.34%,the intermediate particles should be strengthened in grinding, -400 mesh content is about 40% and -10um content accounts for a quarter of the grind products what showed that particles size are not satisfied and unfavorable to subsequent separation. The optimum scheme of primeval ball loading is that: φ70: φ60: φ50: φ40= 15: 15: 30: 40 for φ4.0 × 6.0m overflow ball mill, the separate sizes contents is 64.19% between 0.15∼0.019 mm which increasing by 19.14% compare with 44.78% and the mill -200mesh utilization coefficient increasing 12.6 percents compare with 0.14 about original program when φ4.0 × 6.0m overflow ball mill work itself alone, in addition, the mill -200mesh utilization coefficient increasing 11.71 percents compare with 0.1503 about original program when φ4.0 × 6.0m overflow ball mill and φ3.6 × 6.0m grate ball mill are working together.

Large and Deep Convolutional Neural Networks achieve good results in image classification tasks, but they need methods to prevent overfitting. In this paper we compare performance of different regularization techniques on ImageNet Large Scale Visual Recognition Challenge 2013. We show empirically that Dropout works better than DropConnect on ImageNet dataset.

The Worldwide Interoperability for Microwave Access, or WiMax, is a wireless communication technique based on IEEE 802.16 standards. Its advantage of sending high-data rates over long distances, while using a single base station to cover a large area, has made this technique a flexible and reliable solution for public wireless networks. In this paper, a current-bleeding Gilbert Cell down-converter mixer is proposed for WiMax direct-conversion receivers. With 5.1 dB of conversion gain, 1.5 dBm of IIP3, 36 dBm of IIP2 as well as 11.6 dB and 8.4 dB of single sideband and double sideband noise figure, respectively, the proposed 0.15 mm InGaAspHEMT mixer largely meets the WiMax standards as demonstrated though successful comparison with published designs.

TMS320F2808 DSP chip as the core, combined with signal conditioning and keyboard scan peripheral circuits, made up the hardware circuit of the measuring system. As for software,DSP as the main controller, realized the data display,controlment and management about the whole system, Using the DSP internal integrated ADC module to achieve the data collection, while using its internal resources to complete the FFT algorithm and optimization. The field test results show that this measuring system of digital signal distortion realizes the amplitude and frequency display in time domain and frequency domain when the setting signal passed the test system, and the measuring error is less than 0.8 dB.

Restructuring of Electricity supply industry introduced many issues such as transmission pricing, transmission loss allocation and congestion management. Many methodologies and algorithms were proposed for addressing these issues. In this paper a graph theory based method is proposed which involves Matrices methodology for the transmission usage, loss and transmission reliability margin (TRM) allocation for generators and demands. This method provides loss and TRM allocation in a direct way because all the computation is previously done for usage allocation. The proposed method is simple and easy to implement in a large power system. Further it is less computational because it requires matrix inversion only a single time. A comparison between proposed method and already exiting methods also presents. Results are shown for the sample 6 bus system and IEEE 14 bus system.

Standing balance tests represent the most common way to assess person's functional ability and they were realized by means of specialized and expensive platforms, especially in clinicians’ environments. Wii Balance Board (WBB) is video-game based device that measures center of pressure (CoP) oscillations and it showed promising performance compared with ‘gold standard’ force platforms. In this paper we propose an open integrated custom application to define balance outcomes using WBB. These outcomes were used to execute a validity analysis of WBB performance compared with baropodometer platform (BP). Ten subjects performed two standing balance tests with open and closed eyes respectively on WBB and BP in separate occasion. Validity analysis was carried out using r-Pearson correlation coefficient, ICC analysis, paired-sample t-Test and Bland-Altman plots. Results confirmed that the WBB, although has a fraction of cost of other platforms, represents a tool suitable for some clinician analysis