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In order to eliminate the voltage/current shock and speed loss existing in an electric locomotive when it operates in the neutral section, a virtual co-phase traction power supply system adopting the cascaded H-bridge multilevel converter is presented. In this new system, the power of an electric locomotive can be shared in the neutral section as well. In addition, a smooth transition between two...
Characteristics of equivalent area method of the nearest level modulation (NLM) is analysed in detail and an improved NLM for ten or so cells of cascaded H-bridge (CHB) converter with a high modulation precision is proposed. The proposed algorithm can make the output voltage of the CHB converter better track the voltage modulation. Simulation results are presented to verify the validity of the proposed...
In order to solve the multi-objective optimal grid workflow scheduling problems with various QoS constraints, SPEA2+ is employed to optimize the scheduling performance. The paper proposes a multi-objective optimal grid workflow scheduling algorithm with QoS constraints, namely GWSA. The proposed algorithm, based on the rich-construct AGWL grid workflow model, considers five-dimensional QoS parameters,...
The problem of Web services selection based on quality of service (QoS) hasn't be essentially solved by the single objective optimal algorithm which optimizes service selection by aggregating multiple QoS parameters to form a composite objective function using weighted scoring method. This paper presents a Web services selection algorithm of QoS-aware and global multi-objective optimization, termed...
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