具有调节性能水库发电的优化调度管理

针对目前一些利用具有调节性能的水库进行发电的水电站调度管理存在的一些问题,以电站调度实例从水库蓄水特性、水文气象特性和水轮机运行特性等3个方面论述了如何优化水电站发电的水库调度和各种水头条件下机组运行状态.     

Do Intermittent Renewables Threaten the Electricity Supply Security?

Around the globe, intermittent renewable energies in the form of wind and solar power are on the rise. Their subsidization can be seen as a market intervention, which may deter optimal investment. Thus, this study tests the effect of renewable energies on investment in conventional electricity generation technologies. We estimate a dynamic investment model for 14 European economies for the period 2004–2016 and find a non-negligible negative impact of intermittent renewables on investment in peak-load capacity (mainly gas), while base-load (particularly coal) plants are unaffected. However, the production flexibility of gas-fired plants represents a particularly vital function to balance the supply intermittency of wind and solar. Thus, dispatchable conventional power plants are still necessary to back the system under scarcity events, such as unfavorable weather conditions during high electricity demand. Policymakers should be aware of the adverse effects of RES on investment in peak-load plants and may consider a redesign of the current system, for example by introducing capacity markets.     

AGC在电网安全稳定中的作用及改善AGC运行的措施

自动发电控制（ＡＧＣ）是保证电网优质经济运行必需的手段，对电网安全稳定运行也有重要意义。本文以湖南、广东、云南等电网的自动发电控制与联络线功率控制为实例阐明了ＡＧＣ在提高电网运行稳定性中的作用，并讨论了改善ＡＧＣ控制质量的几个问题。     

软交换在电力通信中的应用分析

软交换技术是下一代网络（NGN）的核心技术,软交换设备是下一代通信网中语音、数据、视频业务呼叫、控制、业务提供的核心设备.文中简要介绍了软交换技术及其优点;鉴于电力通信网的现状及今后发展要求,阐明了将软交换技术引入电力通信网的意义和采用软交换技术构建的下一代电力通信多业务平台将能有效解决的一些问题;根据电力企业自身业务需求分析了软交换技术在电力通信中业务的开发应用;并列举了电力通信网基于软交换技术的组网方案.     

燃料电池和微型燃气轮机的动态模型综述

文章介绍了分散式发电的概况,给出了用于稳定性分析的联网燃料电池降阶模型,包括电压控制和功率控制回路.分散式电源用微型燃气轮机主要包括四部分:燃气透平、永磁发电机、三相整流桥及直流到交流功率逆变器,文章根据这四部分的动态特性和相互关系,建立了适用于暂态特性分析和电力系统仿真分析的微型燃气轮机动态模型.     

一种简单的O型网格生成方法

对于绕流的二维问题 ,可直接在物理平面上生成网格 ,通常可生成C形网格或O型网格 .对C形网格和O型网格的生成方法进行了详细的分析 ,并提出一种简单的O型网格生成方法 ,这种方法生成的网格正交性好 ,且节约计算机的运行时间 .     

Security assessment for intentional island operation in modern power system

There has been a high penetration level of Distributed Generations (DGs) in distribution systems in Denmark. Even more DGs are expected to be installed in the coming years. With that, to utilize them in maintaining the security of power supply is of great concern for Danish utilities. During the emergency in the power system, some distribution networks may be intentionally separated from the main grid to avoid complete system collapse. If DGs in those networks could continuously run instead of immediately being shut down, the blackout could be avoided and the reliability of supply could be increased. However, when to island or how to ensure the islanded systems can survive the islanding transition is uncertain. This article proposes an Islanding Security Region (ISR) concept to provide security assessment of island operation. By comparing the system operating state with the ISR, the system operator can clearly know if it is suitable to conduct island operation at one specific moment. Besides, in order to improve the computation efficiency, the Artificial Neural Network (ANN) is applied for fast ISR formation. Thus, online application of ISR based islanding security assessment could be realized.     

清洁煤发电的CCS和IGCC联产技术

煤气化联合循环（IGCC）发电技术是煤气化和燃气——蒸汽联合循环的结合,是当今国际新兴的一种先进的清洁煤发电技术,其具有高效、低污染、节水、综合利用好等优点。碳捕捉及封存技术（CCS）和整体煤气化联合循环技术（IGCC）被认为是最有潜力的技术。文中简要介绍了整体煤气化联合循环（IGCC）系统、构成及发展现状,总结了二氧化碳的收集方式和封存方法。指出了成本问题是困扰CCS和IGCC的联产应用的主要障碍,并提出了几点发展措施。