In the practice of English Language Teaching, speaking can be the most difficult part for many learners, especially in China. This paper firstly reveals the necessity of giving more freedom and tolerance on speaking c...In the practice of English Language Teaching, speaking can be the most difficult part for many learners, especially in China. This paper firstly reveals the necessity of giving more freedom and tolerance on speaking classes, based on the nature of teaching as well as speaking. Then there is more exploration for the Chinese ELT (English Language Teaching) approaches, explaining the difficulties from the aspects of Chinese culture and philosophy. Afterwards implications are showed on how to give a supportive class in different circumstances, such as dealing with silence, error correction and L1 (native language) interferences.展开更多
多年来湖南电网电压暂态稳定问题一直困扰电网运行,随着±800 k V酒泉—湖南特高压直流投运,电压暂态问题将进一步加剧。本文提出了基于电压稳定极限测试方法,确定湖南电网暂态电压薄弱环节,并通过仿真在系统暂态电压薄弱点增加动...多年来湖南电网电压暂态稳定问题一直困扰电网运行,随着±800 k V酒泉—湖南特高压直流投运,电压暂态问题将进一步加剧。本文提出了基于电压稳定极限测试方法,确定湖南电网暂态电压薄弱环节,并通过仿真在系统暂态电压薄弱点增加动态无功补偿装置,证明能显著提高系统极限切除时间,改善系统整体暂态电压稳定水平。对于优化特高压直流投运后湖南电网动态无功配置,提高暂态电压稳定水平具有重要意义。展开更多
本文采用区域等效方法,对系统的传统频率响应模型进行改进完善,使其能更真实地反映实际电网中各种因素对一次调频的影响。针对超级电容、超导磁、电池、飞轮等多类型储能的运行特性,分别构建这4种储能系统参与电网一次调频的通用模型。...本文采用区域等效方法,对系统的传统频率响应模型进行改进完善,使其能更真实地反映实际电网中各种因素对一次调频的影响。针对超级电容、超导磁、电池、飞轮等多类型储能的运行特性,分别构建这4种储能系统参与电网一次调频的通用模型。结合典型负荷扰动,通过仿真研究分析储能荷电状态(State of Charge,SOC)非线性约束对调频特性的影响及各类型储能特点。展开更多
文摘In the practice of English Language Teaching, speaking can be the most difficult part for many learners, especially in China. This paper firstly reveals the necessity of giving more freedom and tolerance on speaking classes, based on the nature of teaching as well as speaking. Then there is more exploration for the Chinese ELT (English Language Teaching) approaches, explaining the difficulties from the aspects of Chinese culture and philosophy. Afterwards implications are showed on how to give a supportive class in different circumstances, such as dealing with silence, error correction and L1 (native language) interferences.
文摘多年来湖南电网电压暂态稳定问题一直困扰电网运行,随着±800 k V酒泉—湖南特高压直流投运,电压暂态问题将进一步加剧。本文提出了基于电压稳定极限测试方法,确定湖南电网暂态电压薄弱环节,并通过仿真在系统暂态电压薄弱点增加动态无功补偿装置,证明能显著提高系统极限切除时间,改善系统整体暂态电压稳定水平。对于优化特高压直流投运后湖南电网动态无功配置,提高暂态电压稳定水平具有重要意义。
文摘本文采用区域等效方法,对系统的传统频率响应模型进行改进完善,使其能更真实地反映实际电网中各种因素对一次调频的影响。针对超级电容、超导磁、电池、飞轮等多类型储能的运行特性,分别构建这4种储能系统参与电网一次调频的通用模型。结合典型负荷扰动,通过仿真研究分析储能荷电状态(State of Charge,SOC)非线性约束对调频特性的影响及各类型储能特点。
