Force commutated high power electronics

多年来，申请人已经奠定了表明以下内容的理论基础：（1）正弦脉宽调制（SPWM）下的强制（或自）换向转换器作为线性放大器操作;（2）调制带宽应当小于载波频率的1/3。下一个理论回顾是流行的空间矢量调制（SV-PWM）。线性仅对恒定直流电压有效，否则转换器是非线性的。最近，申请人已经应用非线性理论来应用极点配置来改善动态特性。这一模拟成功将被用于实现实验性实施。在工程方面，申请人已经开发了柔性交流输电系统（FACTS）和高压直流（HVDC）的PWM系列中的控制器。继续研究的方向是：部署固有的电压支持和独立的P-Q控制作为附加值;将SSSC等多功能纳入HVDC站;通过将介质电容器纳入串联补偿来降低成本。该研究计划包括两项新举措。首先是研究FACTS和HVDC控制器如何将大型互联电力系统划分为原来更小、更强的单元。本研究以甚低频失稳问题为出发点，利用Hydro-Quebec的平行计算系统HYPERSIM及电力系统模拟软体进行研究。第二项计划继续研究用于风能研究的双馈感应发电机，并在变速交流驱动器中结束。这个为期5年的项目将每年培训3名研究人员。总的来说，它将培养6至8名硕士或博士水平的研究人员。

SUMMARY Over the years, the applicant has laid theoretical foundations showing that: (1) Forced (or Self) Commutated Converters under Sinusoidal Pulse Width Modulation (SPWM) operate as linear amplifiers; (2) the modulation bandwidth should be less that 1/3 the carrier frequency. Next in line for theoretical review is the popular Space-Vector Modulation (SV-PWM). Linearity is valid only for constant dc voltage, otherwise the converter is nonlinear. Recently, the applicant has applied Nonlinear Theory to apply pole-placement to improve dynamic characteristics. This simulation success will be capitalized on to realize experimental implementations. On the engineering side, the applicant has developed controllers in the PWM-family of Flexible AC Transmission Systems (FACTS) and High Voltage DC (HVDC. Continuing research is directed to: deploying the inherent voltage support and independent P-Q control as added values; incorporating multi-functions such as SSSC into a HVDC station; reducing cost by incorporating dielectric capacitors in series compensation. The research proposal carries 2 new initiatives. The first is to study how FACTS and HVDC controllers can partition large interconnected power systems into their original smaller, stronger units. The problem of very low frequency instability will be the starting point in this research.This research will use HYPERSIM, Hydro-Quebec's parallel computation system and power system simulation software. The second initiative continues the research on doubly-fed induction generator for wind energy research and brings it to a close in variable-speed ac drives. This 5 year proposal fields 5 projects  which will be train 3 researchers every year. In all, it will train 6 to 8 researchers in the Master or Ph.D level.