Optimal Feedback Control of Nonlinear Variable-Speed Marine Current Turbine Using a Two-Mass Model

This paper presents a contribution related to the control of nonlinear variable-speed marine current turbine(MCT)without pitch operating below the rated marine current speed.Given that the operation of the MCT can be divided into several operating zones on the basis of the marine current speed,the system control objectives are different for each zone.To deal with this issue,we develop a new control approach based on a linear quadratic regulator with variable generator torque.Our proposed approach enables the optimization of the rotational speed of the turbine,which maximizes the power extracted by the MCT and minimizes the transient loads on the drivetrain.The novelty of our study is the use of a real profile of marine current speed from the northern coasts of Morocco.The simulation results obtained using MATLAB Simulink indicate the effectiveness and robustness of the proposed control approach on the electrical and mechanical parameters with the variations of marine current speed.

基于免疫算法的火电厂循环水系统优化

在综合对比应用于循环水系统优化模型算法的基础上,提出用免疫算法求解,得到了最优决策向量。与遗传算法相比,免疫算法能够有效地寻求火电厂循环水系统的最优组合和最佳调速比,其求解代数更少且质量更高,可有效地提高循环水系统的运行效率。

离心式压缩机调速运行的节能率计算及优化

分析了天然气初加工系统中离心式压缩机的负荷特性 ,给出了离心式压缩机特性曲线的拟合方法及其调速运行时工况点的确定方法 ,在此基础上导出了离心式压缩机调速运行时节能率的计算公式 。

6RA70全数字直流调速装置动态速度响应的调整

通过学习带钢车间、中宽带车间SIEMENS的6RA70系列全数字直流传动装置的调整和系统优化，了解6RA70系列全数字直流传动装置在速度控制精度和稳定运行方面的优势。

小型材精轧速比优化研究与应用

充分利用电动机、减速机等旧设备的功能，解决了精轧区堆钢事故频发的问题，使新轧制工艺成为可能，取得明显的经济效益。