含DG的变电站备用电源投切控制的相关问题的研究-电力系统及其自动化专业论文.docxVIP

含DG的变电站备用电源投切控制的相关问题的研究 含DG的变电站备用电源投切控制的相关问题的研究 摘要 随着可再生能源应用的大力推广，分布式电源(DG)以其特殊优势逐渐成为 一种重要的电力电源形式。但大量DG接入配电网系统会使系统结构变的更加 复杂，将改变原有配电网络的结构由此将可能给配电网的运行、保护及控制等 带来多方面的影响。就变电站备用电源自投装雹而言，由于DG的接入产生的 最直接影响就是系统因故障或其他原因与变电站断开连接后变电站母线电压仍 维持在一定水平，导致以检无压为启动条件的备用电源自投装置无法正常工作 或者动作延时过长，而目前所采取的很多应对措施并没有很好的解决此问题， 制约了各自投装置的作用，降低了系统的供电可靠性。因此本文在系统分析分 布式发电技术的基础上，首先根据电网运行方式的不同，阐述了备用电源自投 装置的应用原则，深入研究了备自投投切控制的基础理论，其次通过理论分析 研究了不同类型DG通过不同电压等级接入变电站后对不同主接线形式下的传 统变电站备用电源投切控制所产生的影响。并针对不同类型的DG分别提‘出相 应的解决方案：针对逆变并网的DG可加装反孤岛装置。而针对传统旋转电机 并网的DG提出解决方案1是将原进线线路保护改造为全线速动的光纤纵差保 护：方案2是在电源进线接入开关处加装监控装置，检测开关处的电压、电流、 功率方向等。并在此研究基础上，开发基于DG接入的变电站备用电源自投装 置。 关键词：DG；并网：控制；备自投；微网；孤岛检测 Research Research on the Problem relating to the Effect of DG Connected on Automatic BUS Transfer of Substation Abstract With Promoting the application of renewable energy，distributed generation becoming one of the most important form of electrical power．But the structure of distribution system will become complex with including a great of distributed generations，distributed generation in the power system will change the present network’S structure，As a result，that will have various effects on the structure、 protection and control of the distribution networks．For automatic bus transfer，the most direct impact caused by distributed generation is that the substation bus voltage maintains at a certain level when power system is disconnected to the substation for fault or other reasons，which causes automatic bus transfer can not start or action time too long，but at present，a lot of response solutions proposed are not good enough to solve this problem，the reliability of the system is reduced．Therefore，based on the analysis of distributed generation technology，at first this article describes the principle of automatic bus transfer due to the different operation modes of power grid，and an in-depth study on the basic theory of automatic bus transfer is done，then followed by the theoretical analysis the impact caused by different types of