微源特性及其对交流微网稳定性与电能质量的影响

发布时间：2018-08-27 15:57

【摘要】：随着传统能源的日益枯竭以及环境污染的加剧,新能源发电成为解决当前危机的重要途径。分布式电源、储能装置以及负荷组成的微电网成为了研究的热点问题。微源特性对微电网的稳定运行以及电能质量的影响值得重视并需研究相应的改善措施。光伏发电单元、风力发电单元等分布式发电装置输出功率的波动是影响系统稳定运行的主要因素。微源通过大量电力电子装置接入系统必然对微电网造成谐波污染。 本文详细分析了风光微源模型,研究了光伏发电单元以及风力发电单元两种典型微电源接入系统的方式,最后研究了微网孤岛运行的等效数学模型。 为了研究微电源不同特性对微网电压稳定性的影响,首先对微网孤岛运行时的静态电压稳定性做了相关的分析。基于对微网孤岛运行时电压稳定性的分析,研究了风光微源对系统电压稳定性的影响。微电源输出功率的不稳定导致直流侧电压波动,进而引起负荷端电压的不稳定。本文就微源引起的电压不稳做了相关的理论分析,并进行了仿真验证。针对系统出现的电压不稳定现象,本文主要研究了储能装置以及相关控制策略对系统电压稳定的改善。 文章主要从微电源的接入以及拓扑结构入手,研究了微源特性对系统电能质量的影响。详细分析了微源接入产生的电压波动、电压偏差以及谐波等电能质量问题。分析了光伏发电系统以及风力发电系统的拓扑结构对系统电能质量的影响。最后,从改善微网电能质量环境出发,研究了带有APF功能的并网逆变器,建立了其小信号模型,分析了谐波电流的检测方法以及电流控制方法。
[Abstract]:With the depletion of traditional energy and the worsening of environmental pollution, new energy generation has become an important way to solve the current crisis. Distributed power generation, energy storage devices and the micro-grid composed of loads have become a hot issue. The influence of microsource characteristics on the stable operation and power quality of microgrid is worthy of attention and the corresponding improvement measures should be studied. The fluctuation of output power of distributed generation units such as photovoltaic units and wind power units is the main factor that affects the stable operation of the system. Microsource access system through a large number of power electronic devices will inevitably cause harmonic pollution to the microgrid. In this paper, the solar microsource model is analyzed in detail, and the two typical micro-power access systems, photovoltaic unit and wind power unit, are studied. Finally, the equivalent mathematical model of micro-grid islanding operation is studied. In order to study the influence of different characteristics of micro-power supply on the voltage stability of microgrid, the static voltage stability of microgrid islanding operation is analyzed. Based on the analysis of the voltage stability of the microgrid isolated island system, the influence of the solar microsource on the voltage stability of the system is studied. The instability of the output power of the micro power supply leads to the fluctuation of the DC side voltage, which leads to the instability of the load terminal voltage. In this paper, the voltage instability caused by microsource is analyzed and simulated. In view of the voltage instability in the system, the improvement of the system voltage stability by the energy storage device and the related control strategy is studied in this paper. In this paper, the influence of microsource characteristics on the power quality of the system is studied from the access of micro power supply and the topology structure. The power quality problems such as voltage fluctuation, voltage deviation and harmonics generated by microsource access are analyzed in detail. The influence of the topology of photovoltaic system and wind power system on the power quality of the system is analyzed. Finally, in order to improve the power quality environment of microgrid, the grid-connected inverter with APF function is studied, its small signal model is established, and the detection method and current control method of harmonic current are analyzed.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM711

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