三相PWM整流器暂态特性分析与研究

随着电力电子器件和控制技术的迅猛发展,三相PWM整流器已经广泛应用于风光储等各类新能源发电领域。本文基于三相电压型PWM整流器(VSR)拓扑和电网电压定向矢量控制策略,分析了三相VSR全工作过程中负载突变不同时刻的暂态工作特性,提出了一种交流侧电感和直流侧电容的工程设计方法;有针对性地阐述了考虑负载突变下三相VSR的软件和硬件设计原则。通过建立仿真模型,仿真分析结果验证了分析的正确性。

A Focus： Epitomizing Approaches of Effective Employability Skills

The present paper reveals the pivotal challenges of fast changing global work environment and industrial needs. Employability skills need to be checked rather than unemployment problem in India. The paper further aims to explore the necessary skills to the challenges of globalizing trends. The issues, approaches, and remedial strategies are focused with reference to the people＇s skills. As the reflections of quality and competence depend on transparency and accountability of the organization, it is necessary to improve the required skills which enhance the levels of confidence. The potential employer＇s requirements are need to be worked very keenly by the institutions. The paper also deals with the effective learning process, which is at par with global counter parts. Exposure to the universal student-centered learning is emphasized to enhance the very crucial pace of work place. Finally this paper studies effective micro and macro issues regarding the dynamics of the industry by applying a broad range of employability skills complementing the technical skills.

景观设计的参与、解读与表达

在本次访谈中,作为张唐景观合伙人,受访人张东首先指出每个民族的景观都应与当地的文化密切相关,认为设计具有中国文化识别性的景观应当是中国景观设计师价值体系的一部分,并强调景观设计在考虑可持续性和韧性提升策略的同时,也应注重与环境教育的结合。随后,基于将景观设计过程视为“两个客观、一个主观”的总结,张东认为设计师对场地的解读,以及个人的知识储备、价值判断和审美倾向都会影响其从场地中获取信息、做出判断和进行设计。在承认生态效益、公众参与是景观设计的重要议题的同时,他格外强调设计的核心价值是创造性地解决问题,景观设计师不可忽视空间营造和对美学的追求。最后,他介绍了张唐景观目前采用的“全过程参与”工作模式,以及这种模式对设计师观察与表达能力的重要意义。