Force commutated high power electronics

多年来，申请人已经奠定了理论基础，表明：(1)正弦脉冲宽度调制(SPWM)下的强制(或自)换向转换器作为线性放大器工作；(2)调制带宽应小于载波频率的1/3。接下来要进行理论回顾的是流行的空间矢量调制(SV-PWM)。线性只对恒定的直流电压有效，否则变流器是非线性的。最近，申请人将非线性理论应用于极点配置以改善动态特性。这一模拟的成功将被用来实现实验实施。在工程方面，申请人开发了灵活交流输电系统(FACTS)和高压直流(HVDC)的PWM系列控制器。继续研究的方向是：将固有的电压支持和独立的P-Q控制作为附加值部署；将SSSC等多功能功能整合到高压直流输电站中；通过将介质电容器串联补偿来降低成本。这项研究提案包含两项新举措。第一个是研究FACTS和高压直流输电控制器如何将大型互联电力系统划分成原来更小、更强大的单元。甚低频不稳定问题将是本研究的出发点，本研究将使用HYPERSIM、海德鲁-魁北克公司的并行计算系统和电力系统仿真软件。第二项倡议继续研究用于风能研究的双馈感应发电机，并结束其在变速交流传动方面的研究。这项为期5年的计划共立项5个项目，每年培养3名科研人员。总而言之，它将培训6到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.