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用直接大范围线性化方法设计发电机的励磁控制器 第一部 分基本理论 被引量:19
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作者 李华 张宝霖 周荣光 《中国电机工程学报》 EI CSCD 北大核心 1992年第2期29-34,共6页
传统的励磁控制器基本上都是按照局部线性化的模型来设计的,不能适应电力系统的要求。针对这一缺陷,本文把非线性控制理论中比微分几何法更简明、更适合于工程应用的直接大范围线性化方法引入电力系统,解决了电力系统强非线性给设计所... 传统的励磁控制器基本上都是按照局部线性化的模型来设计的,不能适应电力系统的要求。针对这一缺陷,本文把非线性控制理论中比微分几何法更简明、更适合于工程应用的直接大范围线性化方法引入电力系统,解决了电力系统强非线性给设计所带来的困难,并使得实现线性化的过程变得极为简捷。全文分为两个部分:第一部分叙述的是直接大范围线性化方法的基本理论,并在此基础上,提出了动态反馈补偿的概念和理论,使所设计的控制器对电力系统结构工况的多变性也能够具有很好的鲁棒性;第二部分应用第一部分的基本理论为励磁系统设计了非线性反馈补偿控制器,并针对单机无穷大系统进行了数字仿真和动模实验,从而证明了所提出方法的有效性。 展开更多
关键词 直接大范围线性化方法 发电机 设计 励磁控制器
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噪声子空间法的宽频段分析 被引量:1
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作者 葛利嘉 陈天麒 黄香馥 《电子科技大学学报》 EI CAS CSCD 北大核心 1993年第1期13-20,共8页
分析了均匀线阵噪声子空间法在宽频段多信号环境下存在的主要问题:不能保证频率和空间方向矩阵的列矢量线性独立、使用方向矢量搜索方法时不能同时正确估计多个信号到达方向两个问题。分析所得结论对于探索利用一维(1—D)方法实现宽频... 分析了均匀线阵噪声子空间法在宽频段多信号环境下存在的主要问题:不能保证频率和空间方向矩阵的列矢量线性独立、使用方向矢量搜索方法时不能同时正确估计多个信号到达方向两个问题。分析所得结论对于探索利用一维(1—D)方法实现宽频段多信号同时测向具有有益的参考价值,计算机模拟结果证明了本文分析的正确性。 展开更多
关键词 均匀线阵 噪声子空间法 信号 测向
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Appraisal of the Production-Oriented Approach: An Introduction 被引量:4
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作者 濮实 《Chinese Journal of Applied Linguistics》 SCIE 2017年第4期452-453,共2页
The production-oriented approach (POA) has been developed over a decade. It is driven by the need to improve English classroom instruction for university students in China (Wen, 2016). It is also motivated by the ... The production-oriented approach (POA) has been developed over a decade. It is driven by the need to improve English classroom instruction for university students in China (Wen, 2016). It is also motivated by the aspiration to enhance the quality of foreign language education in other similar pedagogical contexts outside China. A volume of research has been done by Wen Qiufang and her research team, to formulate the theory of POA and to test its effectiveness in classroom pedagogy (e.g. Wen, 2016, 2015; Yang, 2015; Zhang, 2015). At the moment, the POA is still at an early stage of theory building and almost all empirical research is done in the Chinese context. In order to improve the quality of this theory and to make it intelligible to the international academic community, a one-day symposium was held in Beijing Foreign Studies University on May 15, 2017. The symposium was entitled 'The first international forum on innovative foreign language education in China: Appraisal of the POA'. In the forum, leading experts in applied linguistics were invited to discuss the strengths and weaknesses of the POA and the directions for its future development. The symposium was the first attempt for the POA research team to discuss its latest work with international scholars. This Viewpoint section collects the responses of four experts who participated in the symposium, listed in alphabetical order. The collection of articles covers three topics related to the POA: its pedagogical application, its use for teacher training, and its research. Alister Cumming is Professor Emeritus and the former Head of the Centre for Educational Research on Languages and Literacies, University of Toronto, Canada. His article focuses primarily on POA research as an exemplary case of design-based research. Rod Ellis is Research Professor in the School of Education at Curtin University, Australia. He discusses POA in terms of pedagogy, teacher training and research, with both critiques and constructive suggestions. Paul Kei Matsuda is Professor of English and Director of Second Language Writing at Arizona State University, the writed states. He responds to POA from the perspective of an expert researcher and teacher of L2 writing. Charlene Polio is Professor and Associate Chair in the Department of Linguistics & Germanic, Slavic, Asian & African Languages atMichigan State University, the writed states. She conceptualises POA as a useful method to address some issues in pre-service teacher development. Overall, the articles in this section are insightful and reader-friendly. They are not only useful for the development of POA in particular, but may also be valuable to a broad range of researchers as they touch upon pertaining issues, as well as emerging topics, in the field of applied linguistics. We therefore find it necessary to make them accessible to a wide readership. 展开更多
关键词 The production-oriented approach (POA) has been developed over a decade. It is driven by the need to improve English classroom instruction for university students in China (Wen 2016). It is also motivated by the aspiration to enhance the quality of foreign language education in other similar pedagogical contexts outside China. A volume of research has been done by Wen Qiufang and her research team to formulate the theory of POA and to test its effectiveness in classroom pedagogy (e.g. Wen 2016 2015 Yang 2015 Zhang 2015). At the moment the POA is still at an early stage of theory building and almost all empirical research is done in the Chinese context. In order to improve the quality of this theory and to make it intelligible to the international academic community a one-day symposium was held in Beijing Foreign Studies University on May 15 2017. The symposium was entitled 'The first international forum on innovative foreign language education in China: Appraisal of the POA'. In the forum leading experts in applied linguistics were invited to discuss the strengths and weaknesses of the POA and the directions for its future development. The symposium was the first attempt for the POA research team to discuss its latest work with international scholars. This Viewpoint section collects the responses of four experts who participated in the symposium listed in alphabetical order. The collection of articles covers three topics related to the POA: its pedagogical application its use for teacher training and its research. Alister Cumming is Professor Emeritus and the former Head of the Centre for Educational Research on Languages and Literacies University of Toronto Canada. His article focuses primarily on POA research as an exemplary case of design-based research. Rod Ellis is Research Professor in the School of Education at Curtin University Australia. He discusses POA in terms of pedagogy teacher training and research with both critiques and constructive suggestions. Paul Kei Matsuda is Professor of English and Director of Second Language Writing at Arizona State University the writed states. He responds to POA from the perspective of an expert researcher and teacher of L2 writing. Charlene Polio is Professor and Associate Chair in the Department of Linguistics Germanic Slavic Asian African Languages atMichigan State University the writed states. She conceptualises POA as a useful method to address some issues in pre-service teacher development. Overall the articles in this section are insightful and reader-friendly. They are not only useful for the development of POA in particular but may also be valuable to a broad range of researchers as they touch upon pertaining issues as well as emerging topics in the field of applied linguistics. We therefore find it necessary to make them accessible to a wide readership.
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