300 MW太阳能辅助发电系统经济性研究

为确定光煤互补系统中太阳能辅助发电系统的适配容量,通过计算得到在不同光热流量占比下光煤互补系统的全厂热耗量,对2个热源耦合输入系统进行定量分析,计算耦合及解耦后运行时的双源输入焓,确定互补方案下不同运行模式下光热辅助系统的发电热耗量及其储热系统所需的熔融盐需求量,通过Ebsilon软件仿真模拟得到不同光热流量占比中,与互补系统解耦运行后的单一太阳能辅助发电系统的估计最大装机容量为16.965 MW,最后得到互补系统在节煤型方案3种工况运行下所能达到的节煤量。     

太阳能光热发电—供热联产研究

简述了太阳能热发电系统,详细介绍了槽式太阳能光热发电-供热的联产方案.在工程实际应用方面,提出了一个光热发电-供热联产方案,对光场、装机容量及储热系统进行了设计和计算,并对方案进行了经济效益分析,最后通过经济评价得出方案的补贴措施.     

国标《塔式太阳能光热发电站设计标准》关键共性技术

      目的     塔式光热发电是我国首批太阳能热发电示范项目的主流型式。为了促进科技进步,推动产业发展,有必要对塔式光热发电站的设计进行规范。      方法     在总结分析塔式光热发电站设计经验的基础上,对光热发电设计的共性原则和关键技术进行了研究,给出了适用范围、规模划分、设计寿命等共性原则,重点研究了太阳能资源评估、集热系统与设备、储热系统与设备、自动化系统等关键技术方案。      结果     确定了塔式光热发电站的主要设计方案,给出了发电量估算方法,制定了世界首部太阳能光热发电设计标准《塔式太阳能光热发电站设计标准》。标准为国内塔式光热发电项目的开发、建设和运行提供了技术支撑,其主要内容已经上升为国际标准IEC62862-4-1《塔式太阳能光热发电站设计总体要求》。      结论     标准可对塔式光热发电站的设计提供指导。     

塔式太阳能热发电系统关键设备优化配置研究

通过对国内外已有或拟建的大容量塔式光热发电系统进行分析,结合System Advisor Model(SAM)软件,以太阳直射辐照度为主要外在影响因素,对电站规模及关键设备配置规格进行研究;对3个关键设备提出相应优化配置方案,主要包括定日镜规格、吸热器规格及储能配比,最终得到在一定资源环境下建设大容量塔式光热发电系统各关键设备的最优配置方案。     

塔式熔盐太阳能光热发电技术

我国太阳能光热资源丰富,市场潜力巨大。通过对各种光热发电技术的特点及其在国内外发展现状的介绍,指出了塔式熔盐吸热加储热系统是未来国内最具发展前景的光热发电技术,并分析了该技术的特点和潜在运行风险。最后,通过对比国际光热电价,指出未来国内光热发电成本下降空间很大。     

光热-燃机复合发电系统优化调度模型的研究

在分析光热发电、燃机以及蓄热储能系统各部分运行机理的基础上,考虑对燃机排出气体中的余热进行储存,使用机理分析法构建复合系统的电网调度模型。最后使用粒子群法对模型进行经济环保效益最大化目标的寻优,得到最优调度方案,并与其他传统光热电站进行比较,验证该模型的有效性。     

槽式太阳能光热系统发电量计算研究

针对太阳能槽式光热发电系统,基于光学、力学、传热学、材料学等多方面理论知识,从太阳能光照资源出发,综合考虑集热系统、换热系统、储热系统以及常规发电系统各环节效率及折减因素,研究建立了一套太阳能槽式发电量计算模型,为光热发电项目前期咨询及后期运行预测数据提供参考。     

太阳能光热发电技术发展现状

介绍太阳能光热发电技术系统：塔式、槽式和碟式3种太阳能光热发电系统,对各类太阳能光热发电技术与常规发电技术进行分析对比,阐述3种太阳能光热发电技术的发展现状及其存在的问题,说明太阳能光热发电具有的广阔应用前景。     

槽式光热发电典型热工过程控制系统设计

针对槽式光热发电系统,结合火电厂控制系统设计经验,提出了包括机组负荷-供能控制系统、蒸汽发生器水位控制系统和过热蒸汽温度控制系统的槽式光热发电典型热工过程控制系统的设计方案。为了解决机组负荷和供能之间的耦合关系,提出了光热供能跟随汽轮机、汽轮机跟随光热供能、以光热供能跟随为基础的协调控制以及以汽轮机跟随为基础的协调控制等4种负荷-供能控制方案;为了降低蒸汽发生器水位系统中"虚假水位"现象对控制性能的影响,提出了蒸汽发生器三冲量串级汽包水位控制方案;为了补偿过热汽温大惯性、大时延的特性,提出了过热蒸汽温度内外环控制方案。该研究可以为槽式光热发电控制系统设计提供参考。     

综述太阳能光热发电技术发展

本文主要介绍太阳热辐射能的光热发电技术,重点介绍光热发电的原理、光热发电的四种主要技术,细致地对比分析各种光热发电技术特点,详细地描述光热发电系统的四大组成部分,对热能储存进行全面介绍,并简述光热发电的综合利用技术发展前景。     

Transient power characteristic measurement of a proton exchange membrane fuel cell generator

An experimental study on the transient power characteristics of a fuel cell generator has been conducted. The generator is hybridized by a proton exchange membrane (PEM) as the main power source and a lithium-ion battery as the secondary power source. power-conditioning module consisting of a main bidirectional converter and an auxiliary converter has been designed to manage the hybrid power of the generator that copes with fast dynamics of variable loads. Sensors embedded in the generator have measured the electrical properties dynamically. It was found that the present power-conditioning scheme has well controlled the power flow between the fuel cell stack and the battery by regulating the power flow from or to the battery. In addition, the thermal management system using pulse width modulation (PWM) schemes could limit the operation temperature of the fuel cell generator in a designed range. Furthermore, the dynamics of electrical efficiency of the generator are found to be parallel with those of the net system power. Finally, the stability and reliability of the fuel cell generator is proven by the rational dynamic behaviors of thermal and electrical properties for over 30-h demonstration.     

A novel power block for CSP systems

Concentrating Solar Thermal Power (CSP) and in particular parabolic trough, is a proven large-scale solar power technology. However, CSP cost is not yet competitive with conventional alternatives unless subsidized. Current CSP plants typically include a condensing steam cycle power block which was preferably designed for a continuous operation and higher operating conditions and therefore, limits the overall plant cost effectiveness and deployment. The drawbacks of this power block are as follows: (i) no power generation during low insolation periods (ii) expensive, large condenser (typically water cooled) due to the poor extracted steam properties (high specific volume, sub-atmospheric pressure) and (iii) high installation and operation costs.In the current study, a different power block scheme is proposed to eliminate these obstacles. This power block includes a top Rankine cycle with a back pressure steam turbine and a bottoming Kalina cycle comprising another back pressure turbine and using ammonia-water mixture as a working fluid. The bottoming (moderate temperature) cycle allows power production during low insolation periods. Because of the superior ammonia-water vapor properties, the condensing system requirements are much less demanding and the operation costs are lowered. Accordingly, air cooled condensers can be used with lower economical penalty. Another advantage is that back pressure steam turbines have a less complex design than condensing steam turbines which make their costs lower. All of these improvements could make the combined cycle unit more cost effective. This unit can be applicable in both parabolic trough and central receiver (solar tower) plants.The potential advantage of the new power block is illustrated by a detailed techno-economical analysis of two 50 MW parabolic trough power plants, comparing between the standard and the novel power block. The results indicate that the proposed plant suggests a 4-11% electricity cost saving.     

Modeling of a hybrid marine current-hydrogen active power generation system

This paper presents the modeling and the simulation of a hybrid marine current-hydrogen power generation system. The marine current power generation system consists of a fixed pitch marine current turbine directly coupled to a permanent magnet synchronous generator (PMSG). The generator is connected to a DC link capacitor via a controlled rectifier, which has two modes of operation. The first mode is the maximum power point tracking (MPPT) by using torque control when the generator runs below the rated speed. The second mode is the power limitation (at the rated value) when the generator runs above the nominal speed. The generated power is transferred from the DC-link to the load via an inverter to run the system in a stand-alone operation mode. An energy storage system must cover the difference between the generation and the consumption for this scheme. The hydrogen, compared with the different energy storage systems, exhibits characteristics more applicable for marine current power generation systems. When the generated power is higher than the load requirements, a Megawatt-scale proton exchange membrane (PEM) electrolyzer consumes the surplus energy for hydrogen generation. The generated hydrogen is stored in tanks to feed a PEM fuel cell system to generate power in case of shortage. Based on this topology and operation procedure, the overall system is called an active power generation system. The MW scale PEM electrolyzer model is presented based on state of the art and the literature of different scales PEM electrolyzer system modeling.     

基于直流电机的风力机模拟技术研究

分析了风力机的运行原理,建立了风力机模型,制定了简单有效的转速、转矩控制模拟方案,搭建了基于DSP的直流电机风力机模拟平台,应用LabWindows/CVI开发了上位机界面。该风力机模拟系统应用于并网型变速恒频交流励磁双馈风力发电系统,实现了模拟风力机在不同风速、转速下的运行状态,满足了双馈发电机在同步、超同步、亚同步状态下运行以及进行风电系统最大风能追踪等方面研发的需要,可方便用于实验室条件下风电技术的研究。     

交流励磁变速恒频风力发电机的最优功率控制

研究了参考有功功率和参考无功功率的确定原则和优化计算,进而探讨了发电机的功率解耦控制原理,给出了完整的交流励磁变速恒频风力发电机最优功率控制策略。仿真研究表明,基于参考功率优化计算和矢量控制技术的最优功率控制,可以有效地追踪最大风能,降低发电机损耗,提高风电机组的运行效率和性能。     

转子电流混合控制的并网型绕线式异步风力发电机系统

在分析绕线式异步风力发电机系统转子变流器组成特点的基础上,提出一种新型转子电流混合控制的电路拓扑结构及其控制策略。分析了其中双馈运行和斩波调阻运行两种控制方式之间的切换过程和实现连续过渡的控制规律,并对该风力发电系统进行了动态仿真研究。结果表明,该控制方法兼备双馈控制法和斩波调阻法的一些优点,显著降低了转子变流器的硬件成本,实现了两种控制方式之间的连续过渡,可以满足变速恒频风力发电机系统的要求。     

Fault-tolerant control of an open-winding brushless doubly-fed wind power generator system with dual three-level converter

To improve the fault redundancy capability for the high reliability requirement of a brushless doubly-fed generation system applied to large offshore wind farms, the control winding of a brushless doubly-fed reluctance generator is designed as an open-winding structure. Consequently, the two ends of the control winding are connected via dual three-phase converters for the emerging open-winding structure. Therefore, a novel fault-tolerant control strategy based on the direct power control scheme is brought to focus in this paper. Based on the direct power control (DPC) strategy, the post-fault voltage vector selection method is explained in detail according to the fault types of the dual converters. The fault-tolerant control strategy proposed enables the open-winding brushless doubly-fed reluctance generator (BDFRG) system to operate normally in one, two, or three switches fault of the converter, simultaneously achieving power tracking control. The presented results verify the feasibility and validity of the scheme proposed.     

分布式光伏发电系统改进虚拟同步发电机控制

提出一种计及分布式光伏发电系统源端输出功率波动特征的改进虚拟同步发电机(IVSG)控制策略。对单台虚拟同步发电机功率平衡方程特征值进行分析,明确了光伏电源的基本运行特性,确定了光伏电源稳定运行区域。在传统虚拟同步发电机(VSG)的基础之上进一步采用了直流电压稳定控制技术,提出改进的虚拟同步发电机控制策略。当光伏电源输出功率低于负载需求时起到抑制直流母线电压跌落、维持直流电压稳定的作用,实现按照负荷或并网功率需求进行功率匹配的目的。仿真与实验结果验证了所提控制策略的可行性与有效性。     

一种光储独立并网式虚拟同步发电机控制方法

以光储独立并入电网的虚拟同步发电机结构为研究对象,提出考虑储能输出功率限制的有功调节方案和光储共同参与电压调整的无功调节方案。在有功功率环,当储能系统的充放电功率达到上限时,通过附加控制调节机械转矩,稳定虚拟同步发电机控制方程,避免储能过充或过放风险。在无功功率环,光伏系统与储能系统共同承担无功调压任务,减轻储能系统的无功功率输出负担,实现无功功率合理分配。最后,通过仿真分析和RT-LAB实验结果验证了该控制策略的正确性和有效性。     

一种光储独立并网式虚拟同步发电机控制方法

以光储独立并入电网的虚拟同步发电机结构为研究对象,提出考虑储能输出功率限制的有功调节方案和光储共同参与电压调整的无功调节方案。在有功功率环,当储能系统的充放电功率达到上限时,通过附加控制调节机械转矩,稳定虚拟同步发电机控制方程,避免储能过充或过放风险。在无功功率环,光伏系统与储能系统共同承担无功调压任务,减轻储能系统的无功功率输出负担,实现无功功率合理分配。最后,通过仿真分析和RT-LAB实验结果验证了该控制策略的正确性和有效性。