Results 61 to 70 of about 1,354 (148)
Gaoya dianqi, 2018 随着柔性高压直流输电技术的发展,电压源换流器性能优势得到了越来越广泛的认可,基于模块化多电平换流器（modular multi-level converter,MMC）的电压源换流技术在我国已得到了广泛的应用:南澳多端柔性直流输电工程、舟山多端柔性直流输电工程、鲁西异步联网柔性直流输电工程已经建成投运,±420 kV渝鄂直流背靠背联网工程、±500 kV张北可再生能源柔性直流电网示范工程已开工建设,±800 kV乌东德送电广东广西多端直流输电工程已进入工程实施阶段 ...
刘壮 +6 more
doaj
基于短路发电机系统的MMC型电压源换流器短路电流试验方法研究
Gaoya dianqi, 2018 作为构建智能电网的关键技术—基于电压源换流器（voltage sourced converter,VSC）的柔性高压直流输电技术在中国已经得到广泛应用:±350 kV鲁西异步联网柔性高压直流输电工程建成投运,±500 kV张北可再生能源柔性高压直流电网示范工程开工建设,±800 kV乌东德—广东高压直流输电工程进入工程实施阶段。作为电压源换流器VSC的一种典型结构形式,模块化多电平换流器（modular multi-level converter,MMC ...
胡治龙 +5 more
doaj
Research on DCM Boost PFC Technology Based on Staggered Parallel Topology [PDF]
, 2017 随着电力电子技术的高速发展，电力电子产品渗透到了生活的各个领域，它们产生的高次谐波对电网的污染也日趋严重，使人们对谐波污染治理越来越关注。功率因数校正技术（PFC）可以有效减小谐波污染，改善电网质量，提高电能的利用率，是解决电力电子产品产生谐波的主要手段之一。传统单支路BoostPFC拓扑的输入电流纹波和开关损耗较大，一般应用于中、小功率的场合。所以，本文在Boost拓扑上进行了相应改进，引入了交错并联BoostPFC作为主电路拓扑，基于ATmega16控制器对变换器进行数字控制 ...
姚国斌
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Research on Key Technologies and Industrial Chain Cooperation Paths of Floating Offshore Wind Power Between China and Europe [PDF]
China’s equipment manufacturing system and Europe’s experience in project complement each other. Firstly, this paper focused on the industrial chain and key technologies of floating offshore such as wind turbines, floating foundations, mooring and ...
GANG Ao +5 more
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Dianci bileiqi, 2020 多端柔性直流配网因其技术优势逐渐成为国内外研究热点,典型故障中的过电压和过电流及防护方法研究是其关键技术之一。针对±10 kV三端柔性直流配网开展了典型故障下过电压和过电流仿真分析,提出了三端柔性直流配网避雷器配置方案,并分析了在未配置和配置避雷器两种情况下过电流产生差异及根本原因。首先,针对某三端柔性直流配电系统,开展了典型故障工况、过电流决定性故障工况的理论分析;其次,基于PSCAD/EMTDC建立了三端柔性直流配电系统的电磁暂态仿真分析模型,仿真分析了典型故障下的过电压和过电流 ...
廖毅 +5 more
doaj
A design of high precision and high power electroplating power source [PDF]
, 2012 针对传统电镀电源体积大、实现方式复杂以及输出纹波大的特点,提出了一种新型的dC/dC变换器,采用双闭环PWM实时控制方式,具有恒电流和恒电压两种工作方式。用该方法设计了一组9.6 kW电源模块,实验表明,电源输出纹波系数小于1%,效率达到90%。The tradition electroplating power is large and the output ripple is big.This paper provides a circuit scheme that use high ...
严泳兴, 张志, 朱维龙, 陈文芗
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Gaoya dianqi, 2022 为提升柔性直流输电系统稳定性，一般在柔直单元逆变侧设置辅助直压环，当正、负极间直流电压跌落到一定阈值时，直流电压由逆变侧控制，整流侧输送固定有功功率，并为交流系统电压提供无功功率支撑。然而受环境或自身质量影响，高压直流分压器有可能产生故障，进而引发直流电压波动。当整流侧测量异常偏高时，引起逆变侧辅助直压环起动作，导致此时系统的整流侧和逆变测两端均控直流电压，直流系统输送功率失控，甚至发生反转。针对这一风险，文中基于RTDS的异步联网仿真平台，通过对测量值乘一个异常系数k来模拟直流电压电流测量异常 ...
罗炜, 谢超, 陈培龙
doaj
An analysis method for the maturity of power technology based on literature search [PDF]
China’s power industry has gone through a period of rapid development. With the transformation of the global energy structure, the development goal of building a new type of power system was proposed, which pointed out the direction for the next stage of
HE Dongshan +5 more
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Research on Coal Calorific Value Prediction Based on K-Means Clustering and Ridge Regression Algorithm [PDF]
ObjectivesThe calorific value of coal is one of the important evaluation criteria for measuring coal quality, and is also the main basis for valuation of power coal.
CHEN Heng +4 more
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Study on Double Phase-Locked Loop on the Synthetic Inertia Control of Offshore Wind Farm Frequency Regulation [PDF]
To build the new power system with the main body of new energy, the offshore wind farm (OWF) is an important part and has been rapidly developed in coastal cities.
CAI Chuanwei +5 more
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