Results 41 to 50 of about 1,287 (172)
海上风电经 DR-MMC 并联混合直流送出系统启动及协调控制策略 [PDF]
柔性直流输电技术是实现弱电网条件下大规模新能源送出的有效技术手段。对于以柔性直流输电系统作为唯一输电通道的大规模新能源集群,必须通过有功控制系统保障送端换流站运行在其可行PQ范围内。在分析其越限风险和控制需求的基础上,提出了激进型和保守型两种有功控制策略,并引入超短期预测作为分群指标以提高动态发电指标再分配的准确性。在此基础上提出了基于时序生产模拟的大规模新能源集群有功控制裕度确定方法,并以张北柔直电网及其汇集新能源为例进行了仿真分析。结果表明,激进型有功控制策略需要预留更大的控制裕度 ...
程帆+6 more
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Research on Fault Current Controller of DC Microgrid [PDF]
[Introduction] With the rapid development of AC/DC distribution networks and distributed generation technology, the role of DC microgrids in distribution networks is becoming increasingly important and will become an important component of future ...
Cong LIN, Fang GUO, Xiangfeng LI
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针对模块化多电平换流器型柔性直流输电(modular multilevel converter based high voltage direct current,MMCHVDC)系统中频发的高频谐振现象,提出将矢量电流控制(vector current control,VCC)切换为功率同步控制(power synchronization control,PSC)以抑制其高频谐振的控制策略。首先分析了矢量电流控制下MMC产生高频谐振的机理,并实现了高频谐振现象下由矢量控制到功率同步控制的切换。然后 ...
游广增, 刘鸿超, 芮智, 严正
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Research on Protection Scheme of DC Microgrid Integrated with Fault Current Limiting Control Technology [PDF]
[Introduction] With the development of new loads, such as distributed power sources and electric vehicles, DC(Direct Current) microgrids have the advantages of fewer commutation links and lower system losses than AC(Alternating Current) microgrids, and ...
Bingyao ZHENG+6 more
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在分析各种运行方式下高压柔性直流电网控制目标的基础上,提出基于上层控制的高压多换流站协调控制系统架构,在此基础上设计了换流器双极有功、无功和交流电压闭环控制策略,针对柔性直流电网应用,设计了双极协调控制方法,在控制保护仿真系统上进行了动态性能验证,并提出高压直流电网在有、无通信条件下统一的多换流器协调控制策略,控制保护系统联合RTDS组成闭环数模仿真系统,在仿真系统上对多换流器不同通信条件下的统一多换流器协调控制策略进行验证,证明了所提策略的有效性和正确性。
胡兆庆+5 more
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Electricity Transmission Strategy Research Based on Wind-Coal-Battery-Hydrogen-CCUS Multi Energy Coupling and Bundling System [PDF]
[Introduction] In order to guarantee urban power supply and offshore wind power utilization without building new power lines, the paper aims to establish a electricity transmission strategy based on wind-coal-battery- hydrogen -CCUS multi energy coupling
Jiamin YIN+7 more
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模块化多电平换流器是柔性直流输电技术中的重要组成部分,柔性直流电网中直流过电压对整个系统的危害很大,因此对换流器闭锁退出运行后出现过电压进行仿真和机理分析。分析了换流器中子模块的6种工作状态和MMC的等效模型,根据换流站类型分为送端和受端换流站两种情况,基于PSCAD/EMTDC平台仿真换流器因故障闭锁后直流电压的变化情况,并根据等效电路分析换流站端口直流电压的动态发展过程和机理。由仿真结果发现,PSCAD/EMTDC仿真软件具有一定的缺陷,不能真实地反映断路器的断开,会产生虚拟过电压 ...
李英彪+4 more
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相比于柔性直流输电(VSC-HVDC)送出方案,送端采用不控整流器(diode rectifier,DR)的DR-HVDC方案具有损耗低、体积小和成本低的优点,是未来海上风电送出技术的重要发展方向之一。为了解决黑启动和海上交流电压调控问题,现有的DR-HVDC拓扑主要采用海上平台装设储能、系统增加交流联络线路、送端换流站并联VSC三种方案。以深远海海上风电送出为背景,对上述三种DR-HVDC拓扑方案进行了经济性分析,并与VSC-HVDC方案进行比较。采用了全寿命周期成本分析(life cycle ...
李贤育+6 more
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全球能源互联网以“两个替代、一个提高、一个回归、一个转化”为发展方向,推动全球清洁能源广泛大规模开发利用,通过“九横九纵”骨干网架,建设跨区域输送、跨时空互补、全球配置的战略通道,实现全球清洁能源多能互补的广域广泛应用。首先分析全球能源互联网与多能互补的内涵和内在关系,总结全球能源互联网多能互补的典型应用场景;然后提出基于全球清洁能源资源评估平台(GREAN)和生产模拟的多能互补协同开发综合规划分析方法;最后通过典型案例 ...
余轶+7 more
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Analysis on Influence Factors of Temporary Overvoltage of Load Rejection Fault of Offshore Wind Power Transmission System of Permanent Magnet Synchronous Generator [PDF]
In order to evaluate the temporary overvoltage level of the wind power transmission system based on permanent magnet synchronous generator (PMSG) in case of load rejection, it is necessary to clarify the temporary overvoltage characteristics and its ...
CHEN Qiyu+6 more
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