摘要：power System Stabilizer (PSS) was proposed during 1960s to solve the low frequency oscillation problem raised by the wide application of the high-gain fast-response exciters. The fundamentals of PSS design lie in the angle compensation to increase the damping torque, which, since then, has become an important principle in designing the various power system dampers, such as SVC, TCSC, UPFC. Although many papers have been dedicated to the application of this principle, it is interesting to note that in the real industry applications PSS parameters have to be carefully tuned on site in spite of its mature design theory. So does the classical PSS design theory really meet the PSS design demand? By combining the frequency domain and the time domain analysis, this paper reinvestigates the basic idea behind the classical PSS design theory. The paper clarifies the con-cepts of the synchronous torque as well as the damping torque and proves that the classical PSS design principles based on these concepts are not theoretically sound. Then the paper discusses the Linear Optimal Controller Design method and ana-lyzes its relations with the conventional PID design. By doing so the paper reveals the real mechanism of the PSS and proposes to use more systematic and advanced control tools to enhance the controller performance.

摘要：随着我国经济发展和人民生活水平的提高,能源消耗越来越大。能源和环境是制约我国经济、社会发展的主要障碍,可再生能源的综合利用将起到越来越重要的作用,太阳能和风能是目前利用最广泛、最成熟的可再生能源。本文提出充分利用风能和太阳能的互补性,设计了风能和太阳能联合供能系统在运行中能量产生、储备、利用等各个环节的工作方式,实现可靠、高效地运行,为用户提供了生活用电与供热。该系统很好地利用了风-光可再生资源在季节、天气、地域上的互补性,可拓展风能和太阳能经济利用的范围,可在我国大部分地区推广应用。