【本科毕业设计】在线式三相UPS设计与仿真.docVIP

本科毕业设计 在线式三相UPS设计与仿真 *** 燕 山 大 学 2012年6月 摘 要 随着现代工业的发展,供电网络的负载越来越复杂,特别是大型用电的负载,对供电质量要求较为严格。电网的供电若受到外界因素的干扰会导致电网供电质量发生异常，导致接在电网上的设备发生失控、丢失数据、停机、损坏等严重后果,直接影响到用户的正常工作,造成经济损失或其他严重事故。UPS是一种能为负载提供连续电能的供电系统，己从最初的提供后备时间的单一功能发展到今天提供后备时间及改善电网质量的双重功能，在保护数据，改善电网质量，防止停电和电网污染对用户造成危害等方而起很重要的作用。 本文在分析在线式三相UPS工作原理基础上，设计并仿真一种适用于在线式三相UPS的充电和放电电路，提高了对负载供电的稳定性。采用电流可逆复合斩波电路，设计了一个在线式三相UPS系统中蓄电池储能/释能控制的双向DC/DC变换器；针对市电正常和异常的两种状态，设计了一种利用蓄电池充放电控制方案，解决对负载供电的连续性的要求。当市电正常时，蓄电池母线吸收能量储能，双向DC/DCDC变换器工作于Buck电路模式；当市电异常时，蓄电池向负载释放能量，双向DC/DC变流工作于Boost电路模式。 本文根据负载供电端电压稳定的要求，完成了双向DC/DC变换器闭环控制参数设计。MATLAB仿真结果表明，本文设计方案实现了蓄电池储能/释能控制，实现了UPS系统能量供需的不间断性的要求。 关键词 ：UPS；储能；双向DC/DC变换器；蓄电池；充放电。 Abstract With the development of modern industry, power supply network load more and more complex, especially large electricity load, the power supply quality requirements more stringent. If the power supply is power grid of external factors interference can lead to power supply quality anomalies, lead to meet in the power grid of the equipment, the lost data, occur because downtime, damage and serious consequences, directly affects the normal work of the user, economic damage or other serious accidents. UPS is a kind of can provide continuous load of electric power, power supply systems, from the initial offer has a single function reserve time to today provide backup power quality time and improve the double function, in the protection of data, and improve the quality of power, power cuts and power grid to prevent pollution harm party and such as user has a very important role. Based on the analysis of the on-line three-phase UPS work based on principle, design and simulation applies to the on-line three-phase UPS charging and discharging circuit and improve the load power supply stability. The current reversible composite chopped circuit, design of a three-phase UPS system of on-line battery energy storage/release can be control of both DC/DC converter; When the utility normal, storage battery bus bar to absorb ener