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1.
分布式发电技术及其并网问题研究综述   总被引:1,自引:0,他引:1  
分布式发电因其投资省、发电方式灵活、与环境兼容等特点,日益普遍地与大电网联合运行,给现代电力系统运行与控制带来巨大的变化。大力发展分布式发电技术将是电力系统未来发展的必然趋势。因此,研究分布式发电具有重要的理论意义和重大的应用价值。概述了国内外分布式发电的发展现状及应用前景,简要介绍了分布式发电的概念及几种新型分布式发电技术,分析了分布式发电并网系统及分布式发电并网对电力系统规划、电能质量、继电保护、可靠性等方面的影响,最后对分布式发电的未来研究方向和需要进一步研究的问题作了展望。  相似文献   

2.
随着科技的发展,分布式发电与大电网联合运行更为普遍,同时也推动了现代电力系统控制与运行的变革进程。分布式发电的特征是发电方式灵活、投资成本低、与环境兼容性好等,正是得益于分布式发电的特征,其成为了电力系统发展的必然趋势。在本案,笔者简述了分布式发电技术及其优点,并重点阐述了分布式电源并网后的相关问题,以此为分布式发电技术在电力系统中的应用提供参考意见。  相似文献   

3.
分布式发电及其并网技术综述   总被引:28,自引:7,他引:21  
简要概述了分布式电源及并网技术应用的历史与现状,介绍了主要分布式电源的特点及其最新发展与应用情况,重点介绍了已有的分布式发电并网技术的主要研究成果:分布式发电并网的接口技术;含分布式电源的系统规划、设计及优化;含分布式电源的系统分析与运行控制;孤岛检测、紧急控制与继电保护等。同时指出了分布式电源及并网技术研究的发展趋势与未来方向,为分布式发电技术在电力系统中的广泛应用提供了参考。  相似文献   

4.
分布式发电大规模生产的前提条件是将分散的发电资源集成到现有的电力网中来,组成联合电力系统。为避免其对联合电力系统造成冲击,需要采取相应的技术措施,制定较好的集成、运行和控制策略,以保证联合电力系统的安全与稳定运行。另外,对于分布式发电控制技术,适应融合分布式发电的电力市场机制和相应政策法规,联合电力系统的电能质量管理、运行和控制策略,联合电力系统规划、机组投运方案,电力市场定价以及网损分配方案等需要进行深入的基础研究,并结合实际国情制订相应的标准。  相似文献   

5.
分布式发电(DG)以其发电方式灵活、与环境兼容等特点而得到了广泛的关注。随着DG渗透率的不断提高,DG也给现代电力系统运行与控制带来巨大的影响和变化。首先介绍了分布式发电的概念、分类、不同类型DG的特点和DG的应用,然后总结了DG并网技术会给电力系统带来的影响,最后介绍了DG在国内外的应用现状,为DG技术在我国电力系统中的应用提供了参考。  相似文献   

6.
近年来国际上在可再生能源的研发方面做了大量的工作,促进了分布式发电在实际电力系统中得到越来越广泛的应用.综述了分布式发电技术,包括风力发电、太阳能、燃料电池等;阐述了不同分布式发电技术的动态模型,分析了分布式发电对电力系统运行控制及保护的影响.并探讨了增加电力系统分布式发电比例的挑战.  相似文献   

7.
为准确评估光伏出力对电力系统的运行影响,掌握分布式发电的实时数据,为调度中心提供电网的实时运行状态,需开展广域分布式光伏发电监测与出力估计研究。首先,提出光伏全局出力估计的分布式光伏国-省-地一体化信息建模方法,实现广域分布式光伏发电的有线与无线全景监测;其次,开展不同场景下分布式光伏出力特性研究,通过掌握组件类型、安装方式、地理位置、光资源分布、地形条件等场景对分布式光伏出力的影响,对分布式光伏进行聚合分析,并提出全局出力估计方法;最后,研发广域分布式光伏发电聚合分析和全局出力估计系统,并在省调示范应用。  相似文献   

8.
微电网技术及发展概况   总被引:3,自引:0,他引:3  
分布式发电以其投资省、发电方式灵活且不污染环境等优点,在全球范围内引起了越来越多的关注.微电网能以更具弹性的方式协调分布式电源,从而充分发挥分布式发电的优势.介绍分布式发电及微电网领域研究的诸多问题,讨论微电源、储能装置、逆变装置及隔离装置中需要研究的问题,并从电力系统应用的角度分析微电网的控制和保护、安全稳定运行、电能质量、运行及接入标准等问题.对分布式发电及微电网研究领域未来的研究方向进行总结和展望.  相似文献   

9.
李娜  刘超  段凯彦  曾鸣 《华东电力》2012,(9):1607-1610
研究了分布式发电系统与配电系统并联后的配电系统稳定性和安全性问题。将小波理论应用于分布式发电系统的孤岛运行检测过程,以实现快速检测识别电力系统异常运行现象发生的功能。模拟结果显示,提出的方法能够准确地检测出系统中分布式发电系统孤岛运行情况。  相似文献   

10.
介绍了分布式发电(DG)的研究现状和发展意义,分析了分布式发电并网后对配电侧的规划、运行、控制以及对电力市场的影响。在传统的理论方法基础上,提出了将地理信息系统(GIS)运用在含有分布式发电的配电网规划上,指出了应加强研究智能电网与分布式发电的兼容,从而提高整个电力系统的经济性、灵活性和安全性。最后总结了今后分布式发电领域的研究方向和一些有待解决的问题。  相似文献   

11.
Control and operation of distributed generation in distribution systems   总被引:1,自引:0,他引:1  
Many distribution systems nowadays have significant penetration of distributed generation (DG) and thus, islanding operation of these distribution systems is becoming a viable option for economical and technical reasons. The DG should operate optimally during both grid-connected and island conditions, which can be achieved with change in operating strategy. Many islanding detection techniques have been developed but little work has been done to detect grid re-connection. This paper presents strategies to operate DG in grid connected and islanded modes and a new grid re-connection detection algorithm, which uses average rate of change of frequency (Af5) and real power shift (RPS), in the islanded mode. RPS will increase or decrease the power set point of the generator with increasing or decreasing system frequency, respectively. Simulation results show that the proposed method can operate the DG efficiently and is effective in detecting grid-reconnection.  相似文献   

12.
It is now more than a decade since distributed generation (DG) began to excite major interest amongst electric power system planners and operators, energy policy makers and regulators as well as developers. This paper presents an overview of the key issues concerning the integration of distributed generation into electric power systems that are of most interest today. The main drivers behind the focus on DG integration, especially of the renewable type, in many countries around the world are discussed. A synopsis of the main challenges that must be overcome in the process is presented. Particular emphasis is placed on the need to move away from the fit and forget approach of connecting DG to electric power systems to a policy of integrating DG into power system planning and operation through active management of distribution networks and application of other novel concepts. The paper also analyses the repercussions in transmission system operation and expansion that result from the connection of large amounts of DG of different energy conversion systems focusing on issues related with impacts in steady state operation, contingency analysis, protection coordination as well as dynamic behaviour analysis. A discussion on the possibility of provision of ancillary services by DG is also included. Some results from studies performed in the interconnected Portuguese transmission system are presented and discussed. Some of the opportunities that could be exploited in support of the integration and hence greater penetration of DG into electric power systems are also explored.  相似文献   

13.
在分布式发电装置与电网并联运行模式下,通过分析逆变型分布式电源的"负荷"特性,提出基于功率电流双环控制策略的逆变系统。通过合理选取功率控制环、电流控制环、软件锁相环的PI控制器参数,可以使得分布式发电并网逆变装置具有良好的稳态及动态性能。Matlab仿真模型表明,该控制系统能较好地维持逆变型分布式电源恒功率电压源的拟负荷外特性,控制灵活,反应迅速。  相似文献   

14.
Voltage source converter (VSC) can be considered as the heart of interfacing system for the integration of Distributed Generation (DG) sources into the power grid. Several control methods have been proposed for integration of DG sources into the power grid, and injection of high quality power. However, the converter-based DG interface is subjected to the unexpected uncertainties, which highly influence performance of control loop of DG unit and operation of interfaced converter. The interfacing impedance seen by interfaced VSC may considerably vary in power grid, and the stability of interfaced converter is highly sensitive to the impacts of this impedance changes; then, DG unit cannot inject appropriate currents. To deal with the instability problem, a control method based on fractional order active sliding mode is proposed in this paper, which is less sensitive to variations of interfacing impedance. A fractional sliding surface, which demonstrates the desired dynamics of system is developed and then, the controller is designed in two phases as sliding and reaching phases to keep the control loop stable. Stability issues of the control method are discussed in details and the conditions in which the proposed model works in a stable operating mode is defined. The proposed control method takes a role to provide high quality power injection and ensures precise references tracking and fast response despite such uncertainties. Theoretical analyses and simulation results are established to confirm the performance and feasibility of the proposed control method in DG technology.  相似文献   

15.
将Lyapunov稳定性理论用于电力系统的非线性励磁控制,推 导了实用的发电机非线性最优励磁控制规律。通过理论分析、计算机仿真和动模实 验,证实了该控制方式具有较强的鲁棒性,在系统参数或运行状态变化时都具 有良好的控制效果。而且,励磁控制规律的获得不必经过繁杂的数学推导,易 为工程技术人员所掌握,具有明显的实用价值。为电力系统的励磁控制研究开 辟了一条新的途径。  相似文献   

16.
基于发电预测的分布式发电能量管理系统   总被引:6,自引:0,他引:6  
随着电力市场和新能源发电的不断发展,研究分布式发电的能量管理技术对分布式发电系统的稳定、经济运行具有非常重要的作用。本文介绍了分布式发电系统的网络拓扑,阐述了分布式发电系统能量管理的基本策略和光伏阵列发电预测的工作原理,提出了一种新颖的分布式发电系统能量管理控制算法。该算法根据发电单元的输出电能预测和储能单元的实时状态确定运行模式,采用模糊控制实时调控系统能量流动的方向和幅值,实现了系统运行成本最优化。  相似文献   

17.
Voltage flicker or voltage fluctuations are considered a major power quality problem causing temperature rise, generators and motors overloading and affecting humans through the irritating light flicker. It is expected that the level of voltage flicker will increase due to the increased penetration of distributed generation (DG) in the distribution system. Site monitoring is required to make sure that the level of voltage flicker is within the allowed limit. In order to determine the appropriate monitoring period for voltage flicker measurement while considering DGs, two case studies were considered in the paper; 1 week and 1 day monitoring periods. The results reveal that a monitoring period of 1 week may be very long especially in the presence of DG and it may hide valuable information. On the other hand a 1-day monitoring period is more appropriate in these situations. Therefore it is recommended to use 1-day monitoring period instead of 1 week especially in the presence of DG.  相似文献   

18.
应用边界保护原理提高分布式发电系统并网协调性的方法   总被引:5,自引:1,他引:4  
袁超  曾祥君  邓丰  许瑶 《电网技术》2009,33(5):62-68
为解决分布式发电系统与配电网保护的协调性问题,提出了一种新的分布式发电(distributed generation,DG)并网控制方法。由于在DG系统并网点上游和下游线路故障时,DG系统对电网保护的影响是不同的,因此提出在带有DG 系统的配电线路上装设阻波器构成线路边界的思想,采用行波边界保护模式,对DG系统并网点上游和下游故障进行选择性保护,进而保证配电线路故障后DG系统能够快速准确地解列,确保系统的安全运行,并最大限度地提高DG的利用效率。仿真结果和理论分析表明,新保护方法可提高DG与配电网的协调性,并可有效提高DG的利用效率。  相似文献   

19.
含分布式电源的三相不平衡配电网潮流计算   总被引:6,自引:1,他引:5  
赵晶晶  李新  许中 《电网技术》2009,33(3):94-98
根据配电网三相不平衡的实际情况,为准确计算各种分布式电源(distributed generation,DG)并入配电网后的潮流问题,文章基于前推回代法,提出了可处理PV和PQ节点模型DG的三相不平衡潮流算法。按照配电网拓扑结构,利用支路分层技术,加快了潮流计算速度。在处理PV节点模型DG时,将电压正序分量幅值作为电压调节参数,计算电压正序分量幅值和额定电压幅值差,得到PV节点的无功补偿量,将DG由PV节点运行模型转换为PQ节点运行模型。IEEE 34节点系统算例结果验证了该算法的正确性。最后,通过分析DG对电压的调节和无功补偿能力,研究了不同类型DG对配电网电压的影响。  相似文献   

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