孤岛式风光柴蓄智能微网系统的研制

为解决海岛地区用电难问题,基于微网技术,利用太阳能、风能、柴油机、蓄电池等研制开发出一套智能微电网系统。以单片机为核心进行了系统方案设计和硬件电路设计,并基于能量调度策略设计了系统运行控制程序。样机系统集成并进行了负载投切试验、稳定性试验和超负荷试验,现已投入试运行。结果表明,该微电网系统工作状况良好,整体性能稳定可靠,智能控制功能满足实际要求。     

风光储互补微网系统集成技术的研究与设计

为提高微电网的运行效率,从系统层面统一协调控制各分布式电源及负荷,提出了基于风光储互补的微网系统的集成技术。介绍了基于风光储互补的微网系统方案,提出了微网运行模式和微网离网、并网以及离并网切换的协调控制策略,设计了基于DSP 28335芯片的能量协调控制器,实现了风光储微网系统控制管理功能的集成。工程实践验证了该设计方案的有效性。     

风光储微网系统孤岛运行控制策略研究

文章建立了基于光伏发电系统、永磁同步风力发电系统以及混合储能系统的微网系统,主要对低压微网孤岛运行控制策略进行研究。针对传统单一主电源控制存在的缺陷,设计了由超级电容和蓄电池组成的混合储能系统作为主电源,采用改进V/F控制策略,为微网系统提供电压和频率支撑,同时在微网系统频率波动时实现功率的快速跟踪;风力发电系统和光伏发电系统作为从电源,采用按最大功率跟踪输出的PQ控制策略。基于PSCAD/EMTDC仿真平台建立了微网系统仿真模型并对不同运行工况进行仿真实验,仿真结果表明了该控制策略的有效性,同时微网孤岛运行的可靠性和稳定性得到了提高。     

基于RTDS风光储微网协调控制仿真研究

风能和太阳能作为清洁的可再生能源,具有很大的发展潜力。电池储能系统技术的更新,使得引入规模化、集成化的电池储能系统,构建风光储联合发电系统的开发利用越来越受到人们重视。文章介绍了风光储微网系统中各分布式发电系统(DG)的结构、系统特点及基本原理,利用实时数字仿真仪(RTDS)搭建了风光储微网的仿真模型,并验证了该微网系统的稳态并网试验,并设计了基于低通滤波器算法的风光储协调控制策略,从而提高风光储联合发电系统功率输出的平滑性和可调度性。     

风光互补微电网智能测控终端的设计

为了集中采集微网系统实时运行数据,并且对微网系统进行协调控制以及对蓄电池充放电进行有效管理,设计了微网智能测控终端。测控终端结构简单、运行可靠,硬件上采用高性能的ADSP-BF518数字信号处理芯片和高精度同步采样模数转换芯片AD7606,从而实现数据集中采集功能,并采用基于短期负荷预测的储能控制策略实现蓄电池管理。测控终端通过通信网络可以及时向监控中心上传数据,并能够接受中心下发遥控指令对微网系统进行控制。工程实践表明,该设计在微网实时监测与集中控制方面效果明显。     

基于自适应变异粒子群算法的独立多元 互补微网经济环保运行

独立多元互补微网对于解决许多可再生能源丰富但是传统电网供电困难地区的用电问题有着非常重要的作用。为保证供电可靠性,提高整个微网系统的经济性和环保性,需根据实际条件对系统运行进行优化。综合考虑了运行成本、气体污染排放量等运行指标,建立了微网优化运行数学模型。设计了系统调度策略,最终采用带变异的自适应粒子群算法实现了微网经济环保运行。具体算例结果验证了该算法的合理性和有效性。     

光储互补微网半实物仿真系统设计

利用RTDS、dSPACE的实时仿真特点及信号输入输出的能力,设计光伏、储能变流器以及模拟电网接口,搭建光储互补微网半实物仿真系统,并设计微网能量管理中心。基于该平台,进行微网并网、孤岛模式下的测试及并离网无缝切换实验。实验表明该系统能够很好地完成微网分布式电源、电网状态及微网运行模式的模拟,为分布式电源与电网间相互作用与影响的研究提供较方便的手段。     

基于不同控制策略的微网仿真

考虑微网系统建设成本和运行的灵活性、可靠性,对微网建设初期的接线方案进行了选择.研究了2种微源控制方法,基于微源的不同控制原理建立了微网系统仿真模型,针对计划孤网和非计划孤网中的下垂控制和混合控制进行了仿真分析.仿真结果验证了微网计划孤网的稳定性和孤网控制方法的有效性.任何控制方式下微网再并网时,均需对各微源出力进行重新调整,才能保证微网运行模式的平滑过渡.     

基于PLC的太阳能空调控制系统应用研究

针对公司现有太阳能空调系统的特点,本文设计了一套基于西门子PLC的太阳能空调控制系统。该系统具有人机交互界面良好、运行稳定、精度高等特点。目前,该控制系统已投入实际使用,且运行效果表明该系统能够实现对太阳能空调的各项控制设计指标。     

风—光—柴微网系统运行策略及定容选择问题研究

在风—光—柴微网系统具有可靠性和经济性的基础上,进行了微网系统参数设定和功能分析,确定了并网和孤岛两种方式下微网系统的运行策略,并以具体元件的参数设计为基础,对微网系统的元件进行了选择,优化了微网系统设备,为微网系统的运行提供了参考。     

基于MMC-PET的直流微电网综合控制策略

为提升智能配电网电能质量,提出一种基于模块化多电平型电力电子变压器的直流微网构架及其综合控制策略,对分布式电源并网方式进行简化,设计MMC-PET及风光储系统的控制器,对智能配电网中电压深度跌落、三相不平衡等电能质量问题进行治理。在PSCAD/EMTDC平台搭建基于MMC-PET的直流微网风光储系统仿真模型,进行仿真分析总结,结果表明该方法很大程度地提高了新能源接入适应性,具备更快的动态响应速度和更强的鲁棒性,能有效改善智能配电网电能质量。     

Technological development of multi-energy complementary system based on solar PVs and MGT

The complementary micro-energy network system consisting of solar photovoltaic power generation (solar PVs) and micro-gas turbine (MGT), which not only improves the absorption rate and reliability of photovoltaic power, but also has the advantages of low emission, high efficiency, and good fuel adaptability, has become one of the most promising distributed power systems in the field of micro grid. According to the development of current technology and the demand of actual work, this research described the domestic and foreign development of microenergy network system based on solar PVs and MGT. Moreover, it analyzed the challenges and future development regarding the micro-energy network system in planning and design, energy utilization optimization and dispatching management, and system maintenance, respectively. Furthermore, it predicted the future development of the key technology of the multi-energy complementary system. These results will be beneficial for the progress of this field both in theory and practice.     

考虑储能系统的微电网可靠性效益评估模型研究

可靠性效益是指微电网系统达到一定的供电可靠性水平而使用户减少的停电损失,也即获得的效益,储能系统的安装对微电网可靠性效益有着重要影响,为此需分析储能系统在微电网可靠性效益提升方面的作用。首先,基于总电量不足指标E_(ENS)成本的最小化构建微电网可靠性评估模型;其次,提出改进的蚁群算法,通过设置启发式参数改善其收敛性及计算精度;最后,选取典型微电网系统进行测算,分析电池储能系统的安装对微电网闲置容量、E_(ENS)分布及系统运行成本的影响。结果表明,电池储能系统的安装对微电网的可靠性效益带来积极影响;同时改进的蚁群算法在收敛性和计算时间上都有显著提升。     

Opportunities and challenges in setting up solar photo voltaic based micro grids for electrification in rural areas of India

Rural area electrification in developing countries helps to improve the quality of life of the people. It increases productivity and supports education. It also discourages people from migrating towards urban areas. In India about 70% of the population lives in rural area, hence it is necessary to electrify these villages to achieve inclusive economic growth. Transmission and distribution of power to this less densely populated areas which are located far away from the power generating stations is the major reason for not able to achieve 100% electrification in the country. Hence it is necessary to find out an energy source which can be decentralized to supply power to these hamlets. As India is blessed with solar energy which is omnipresent in almost all parts of the country, micro grid system which uses solar photo voltaic panels seems as the finest option. The solar photo voltaic system converts light energy into direct current power using photovoltaic effect. Battery is used to store the extra power generated during the day and used during nights. Inverters and power conditioning devices are used to convert direct current power generated by solar photo voltaic systems to alternative current, which is supplied to the load using power distribution network which adds to system cost. At present the capital cost and the land requirement for this system is higher than all other renewable energy power generation system. But it has very less operation and maintenance cost which makes it superior to other system. Moreover additional modules can be added to it when the power demand increases. This paper says about how rural area electrification can be achieved in India by solar photo voltaic system micro grid system and the challenges which has to be over come during implementation.     

Design of a robust and efficient power electronic interface for the grid integration of solar photovoltaic generation systems

Nowadays, the penetration of photovoltaic (PV) solar power generation in distributed generation (DG) systems is growing rapidly. This condition imposes new requirements to the operation and management of the distribution grid, especially when high integration levels are achieved. Under this scenario, the power electronics technology plays a vital role in ensuring an effective grid integration of the PV system, since it is subject to requirements related not only to the variable source itself but also to its effects on the stability and operation of the electric grid. This paper proposes an enhanced interface for the grid connection of solar PV generation systems. The topology employed consists of a three-level cascaded Z-source inverter that allows the flexible, efficient and reliable generation of high quality electric power from the PV plant. A full detailed model is described and its control scheme is designed. The dynamic performance of the designed architecture is verified by computer simulations.     

节能新技术在远距离管网温度监测系统的应用

大庆石化公司对其外送输油管道伴热管线进行温度监测,采用了基于GPRS的通讯和太阳能供电技术,该温度监测系统由监测中心、监测终端、通讯网络三部分组成,其中监测终端采用太阳能系统供电。采用GPRS无线数传技术,信号传输速度快、稳定性好、抗干扰能力强;采用高精度的E型表面热电偶和Adam 4018+工业级智能温度采集模块,准确性好、故障率低;采用太阳能供电,具有防燃、防爆、耐高压等多种特性,安全性好;软件系统功能丰富,可以设置多点报警和在线修改报警界限值,灵活性高;本系统模块化程度高,使用元器件综合考虑了使用寿命和维护成本,维护方便、扩展性强、性价比高;为监测终端设计了保温箱,提高了系统的抗寒能力。从系统运行情况来看,各监测终端与监测中心的通信稳定,中心软件运行正常,各项指标均满足要求。GPRS通讯和太阳能供电系统,与传统的温度检测系统相比,减少了电缆及其铺设费用,减少了电费消耗。本技术具有推广价值。     

The application of Bayesian network classifiers to cloud classification in satellite images

The need to reduce the impact of traditional electricity generation necessitates an increase in the optimization of alternative systems that produce less environmental contamination. Renewables play a key role, with solar energy considered one of the most important energy supply sources. Solar power plants have to be perfectly designed to optimize electricity generation, and their placement must be as suitable as possible for the meteorological conditions. Clouds are the most mitigating factor in solar energy production and their study is decisive in locating the plant. Apart from the importance of studying clouds before building the solar plants, cloud detection is equally decisive in adapting plant operation to cloud types during solar power plant operation.This adaptation benefits plant performance and allows electricity management to be integrated into the electricity grid. Nonetheless, the majority of cloud studies determine atmospheric parameters, which are sometimes not available. In this work, we have developed an automatic, fully-exportable cloud classification model, where Bayesian network classifiers were applied to satellite images so as to determine the presence of clouds, classifying the sky as cloudless or with high, medium and low cloud presence. There was an average success probability of 90% for all sky conditions.     

基于多因素分析的微网综合效益评价

为评价含有风电、光伏发电及微型抽水蓄能发电的微网系统的效益,采用多因素分析方法,通过电力不足概率和期望缺供电量两个指数检验微网供电可靠性,采用净现值、效益费用及回收期三个度量指标评价微网系统经济性,并通过计算安装微网系统后减少的碳排放量评估微网环境效益,最终得到微网的综合效益评价结果。结果表明,微网系统拥有较高的经济和环境效益,且运用蓄电池技术可显著提高微网的可靠性。     

风光储微电网系统容量配比分析

受自然环境、交通等条件制约,西藏自治区的一些偏远地区尚未实现大电网覆盖,电力供应严重不足。以双湖县为例,依托当地丰富的可再生资源,建立以光伏、风电、储能为主体架构的光、风、储能互补型微电网,并根据当地用电负荷要求,在分析各类电源出力特性的基础上,确定了微电网中各类电源的容量配比,结果对类似地区建设微电网具有较好的借鉴意义。