【作者】 王雪；

【导师】 张建成；

【作者基本信息】 华北电力大学(北京) ， 电力系统及其自动化， 2012， 硕士

【摘要】 在能源枯竭和环境污染问题日益严重的今天,太阳能发电凭借其可持续发展且无污染的独特优势成为备受人类青睐的常规能源的替代品,而光伏并网发电作为太阳能应用的必然趋势,已成为新能源发电技术研究的一个重要领域。太阳能发电实用化的前提是并网系统发出符合电能质量标准的稳定可靠的电能,这也是光伏并网技术研究的首要任务。本文以单相光伏供电系统为背景,以中小容量光伏供电系统为研究对象,以优化供电电能质量为目标,对系统的拓扑结构、控制方法等技术问题进行了深入的研究和探讨。首先对光伏发电系统的并网运行进行了全面的理论分析,将研究对象进行理想化处理,通过对两个理想电源并联运行的深入思考,揭示了在并网模式下电能质量的影响因素,为控制策略的研究提供了方向。随后,从用户对光伏发电系统的实际需求出发,设计了单相光伏供电系统的功能和工作模式,通过理论分析和仿真实验确定了比较恰当的主电路形式,并对电路中各模块进行了设计和参数选择。在现有研究成果的基础上,为实现逆变系统并网过程输出有功功率的灵活可控,设计了一种双环双模块控制方案:内环电流控制模块针对并网电流波形进行控制,外环功率控制模块针对输出有功功率进行控制,同时设计了电压前馈环节,以期获得最优的电能质量输出。在Matlab/Simulink仿真环境下搭建了单相光伏供电系统仿真模型,对提出的控制方案进行了一系列仿真实验,从多角度验证了所提出控制方法的灵活性和可靠性。更多还原

【Abstract】 Nowadays,as energy crisis and pollution problem becoming increasingly serious,solar power generation is turning into the conventional energy substitute favored by human because of its unique advantages,such as sustainable developing prospect and pollution-free characteristic.Photovoltaic grid-connected generation as an inevitable trend of the solar energy application,has become an important field of new energy research.Providing eligible electric power with stable quality and reliability is the premise of solar power’s practical use,which is also the top task of photovoltaic grid-connected technology research.Regarding the single-phase photovoltaic power supply system as background,this paper targets at small and medium-sized power supply system and discusses the topological structure and control techniques aiming to optimize the power quality.First,the paper makes comprehensive theoretical analysis of photovoltaic grid-connected power system.Through idealized processing and deep research of two ideal voltage sources,the paper reveals several influencing factors of the electric power quality in the grid-connected condition which provides directions of the control strategy research.Considering the consumers’ requirements of the photovoltaic power system,the paper also designs the function and working pattern of single-phase power supply system.Through the theoretical analysis and simulation experiments,an appropriate main circuit form is determined.In this process,each module of the circuit is designed and parameters are optimized.In addition,on the basis of current research achievements,to realize the dispatchable characteristic of active power,the paper designs a kind of double loop with double control modules strategy:current control module for grid current waveform as the inner loop,power control module for output active power as the outer loop.And the voltage feed-forward unit is added to the control strategy in order to obtain the optimal output electric power.In the Matlab/Simulink simulation environment,the paper sets up the single-phase photovoltaic power supply system simulation model,and with a series of simulation experiments,the flexibility and reliability of proposed control method is verified from several aspects.更多还原