直接模型预测控制DMPC(direct model predictive control)在改善背靠背BTB(back-to-back)变流器永磁同步发电机注入电网电能质量方面具有重要作用。然而,由于BTB变流器的可行电压矢量VVs(voltage vectors)都是用来预测和评估的,且其成...直接模型预测控制DMPC(direct model predictive control)在改善背靠背BTB(back-to-back)变流器永磁同步发电机注入电网电能质量方面具有重要作用。然而,由于BTB变流器的可行电压矢量VVs(voltage vectors)都是用来预测和评估的,且其成本函数中的权重因素会影响控制性能,因此,DMPC的计算量比较大,调整过程复杂。为此,利用直接控制的简单性,结合直接转矩控制DTC(direct torque control)和直接功率控制DPC(direct power control),提出了一种新的直接模型预测磁通控制DMPFC(direct model predictive flux control)和直接模型预测功率控制DMPPC(direct model predictive power control)。首先,通过定义新的DTC和DPC切换表,在8个预测参数中只需要3个就可为BTB变流器选择最佳电压矢量,大大减少计算量。此外,为了避免权重因素的影响,本文将电磁转矩简单地转换为等效定子磁通,在成本函数中只考虑等效定子磁通。最后,实验结果表明,该方法的计算时间减少了26.9%,同时获得了最佳的控制效果。展开更多
Many skyscrapers have installed wind turbine systems to use new renewable energy. In particular, building an integrated wind power generation system by installing a wind power generator inside a building is an attract...Many skyscrapers have installed wind turbine systems to use new renewable energy. In particular, building an integrated wind power generation system by installing a wind power generator inside a building is an attractive method to secure safe energy. However, most studies have dealt with the efficiency of wind turbines and the response effects of wind induced vibration; space preparation for wind turbine installations has not been sufficiently considered. This work reviewed the shapes of openings where wind turbines can be installed in skyscrapers, and the characteristics of wind induced vibration responses occurring in the building with changes in cross sectional area. Nine wind power models were constructed to carry out the experiment. According to the experimental results, wind speed varies with shape of opening in the order of C-type>S-type>R-type. Moreover, wind speed increases as the area is reduced.展开更多
文摘直接模型预测控制DMPC(direct model predictive control)在改善背靠背BTB(back-to-back)变流器永磁同步发电机注入电网电能质量方面具有重要作用。然而,由于BTB变流器的可行电压矢量VVs(voltage vectors)都是用来预测和评估的,且其成本函数中的权重因素会影响控制性能,因此,DMPC的计算量比较大,调整过程复杂。为此,利用直接控制的简单性,结合直接转矩控制DTC(direct torque control)和直接功率控制DPC(direct power control),提出了一种新的直接模型预测磁通控制DMPFC(direct model predictive flux control)和直接模型预测功率控制DMPPC(direct model predictive power control)。首先,通过定义新的DTC和DPC切换表,在8个预测参数中只需要3个就可为BTB变流器选择最佳电压矢量,大大减少计算量。此外,为了避免权重因素的影响,本文将电磁转矩简单地转换为等效定子磁通,在成本函数中只考虑等效定子磁通。最后,实验结果表明,该方法的计算时间减少了26.9%,同时获得了最佳的控制效果。
基金Project(2011-0028567)supported by the National Research Foundation of Korea
文摘Many skyscrapers have installed wind turbine systems to use new renewable energy. In particular, building an integrated wind power generation system by installing a wind power generator inside a building is an attractive method to secure safe energy. However, most studies have dealt with the efficiency of wind turbines and the response effects of wind induced vibration; space preparation for wind turbine installations has not been sufficiently considered. This work reviewed the shapes of openings where wind turbines can be installed in skyscrapers, and the characteristics of wind induced vibration responses occurring in the building with changes in cross sectional area. Nine wind power models were constructed to carry out the experiment. According to the experimental results, wind speed varies with shape of opening in the order of C-type>S-type>R-type. Moreover, wind speed increases as the area is reduced.
