Desired Dynamic Equation for Primary Frequency Modulation Control of Gas Turbines

Gas turbines play core roles in clean energy supply and the construction of comprehensive energy systems.The control performance of primary frequency modulation of gas turbines has a great impact on the frequency control of the power grid.However,there are some control difficulties in the primary frequency modulation control of gas turbines,such as the coupling effect of the fuel control loop and speed control loop,slow tracking speed,and so on.To relieve the abovementioned difficulties,a control strategy based on the desired dynamic equation proportional integral(DDE-PI)is proposed in this paper.Based on the parameter stability region,a parameter tuning procedure is summarized.Simulation is carried out to address the ease of use and simplicity of the proposed tuning method.Finally,DDE-PI is applied to the primary frequency modulation system of an MS6001B heavy-duty gas turbine.The simulation results indicate that the gas turbine with the proposed strategy can obtain the best control performance with a strong ability to deal with system uncertainties.The proposed method shows good engineering application potential.

风机叶片覆冰机理与预测分析

高原和寒冷地区风能资源十分丰富,风机在此地区运行时叶片表面极易出现覆冰现象。针对寒区风机叶片覆冰问题,本文首先明确覆冰机理以及主要的影响参数;基于数值模拟分析在冻雨条件下,环境因素和叶片几何参数对叶片覆冰的影响。结果表明,当温度不变,风速从2 m/s增加到4 m/s时,叶片表面的最大覆冰厚度增幅高达117%;当风速从4 m/s到10 m/s时,最大冰厚增幅逐渐减小到0.9%,覆冰质量随着风速的增加呈线性增长。当风速不变,温度从-1℃降到-2℃时,叶片表面的覆冰质量和最大冰厚分别增加71%和24%;当温度从-2℃到-5℃时,覆冰质量和最大冰厚增幅减小到1.7%和0.9%。当温度和风速在某一固定值时,覆冰质量和最大厚度随着叶片相对厚度和攻角的增加而增大。