太阳能并网发电系统低电压穿越技术研究

发布时间：2019-04-03 07:45

【摘要】：当前能源的短缺已经成为人类面临急不容缓的关键问题,化石燃料储量的制约以及对环境的污染和破坏促使新型清洁替代能源的研究和发展。光伏并网发电技术以其高效、清洁、易于大规模使用等特点,愈发受到各国政府和相关科研机构的青睐,全球光伏发电总量也在快速增长。然而,当前的太阳能光伏发电技术尚存在一些问题,如电网故障导致的电网电压骤降下光伏并网系统无法保证不脱网、不解列运行,无法很好实现低电压穿越的能力,即LVRT (Low Voltage Ride-Through)。并且在电网故障期间对电网提供有功、无功以支持电网故障相电压的技术尚待进一步研究。本文主要对太阳能并网发电系统低电压穿越技术进行研究,具体内容包括：1)电网故障模拟平台的研究,分析其阻抗特性以及对电网实际故障的模拟相似程度分析；2)电网故障下太阳能并网发电系统不解列、不脱网运行的控制策略研究,在不过流情况下保持并网；3)电网故障下太阳能并网发电系统功率支撑的研究,分析不同功率成分对电网故障的支撑作用。
[Abstract]:At present, the shortage of energy has become an urgent key issue for human beings. The restriction of fossil fuel reserves and the pollution and destruction of the environment promote the research and development of new clean alternative energy sources. Photovoltaic grid-connected power generation technology with its high efficiency, clean, easy to use on a large scale and other characteristics, more and more favored by governments and relevant scientific research institutions, the global PV generation volume is also growing rapidly. However, there are still some problems in the current solar photovoltaic power generation technology, for example, the grid-connected system can not ensure that the grid-connected system can not be off-grid or unlisted, and can not realize the ability of low-voltage traversing very well under the sag of grid voltage caused by the power grid failure. (LVRT (Low Voltage Ride-Through). At the same time, the technology of providing active power and reactive power to support the fault phase voltage of the power network during the fault period needs to be further studied. This paper mainly studies the low-voltage traversal technology of solar grid-connected power generation system, including: 1) the research of power network fault simulation platform, the analysis of its impedance characteristics and the simulation similarity analysis of the actual fault of the grid; 2) study on the control strategy of the solar grid-connected power generation system under the fault of the power grid, and keep the grid-connected system under the condition of no overcurrent; 3) study on the power support of solar grid-connected power generation system under the fault of power grid, and analyze the support effect of different power components on the fault of power grid.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615

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