【作者】 王华；

【导师】 范春菊； 夏杰；

【作者基本信息】 上海交通大学 ， 电气工程， 2009， 硕士

【摘要】 上海电网是一个典型的受电电网,对外来电力依赖十分严重且不断加剧,作为负荷中心而电源布点严重不足是上海电网安全的最大威胁。外高桥电厂拥有可建造两台百万容量级火电机组的土地资源,同时在输出线路方面有较大余量,接入到220kV电网不需要新建线路走廊,本文对外高桥电厂扩建的两台机组(四期)接入到220kV电网的方案进行了设计,并对此做了深入的分析和研究。本文分析了上海电网的现状,介绍了上海电网最近几年的发展规划,通过电力平衡分析,得出外高桥电厂在“十一五”末扩建两台百万容量级机组的必要性;详细介绍了外高桥四期两台机组接入到220kV电网的方案设计,讨论了220kV机组接入对电网运行方式的影响以及接线方式的更改;介绍了潮流和短路电流的计算方法,并给出了外高桥四期接入到220kV电网后的潮流分布和短路电流的计算结果。除考虑该方案潮流输送合理外,还要对电网主要设备发生跳闸后的N-1运行方式进行校验,确保设备的运行安全,主要线路潮流不超过限额;对其进行短路电流计算,通过调整现有电网接线和运行方式的前提下,以满足短路容量的限制要求。对接入方案的可行性进行了校验,并给出更换相关线路导线截面以及电网运行方式及接线调整等建议。最后,本文对下一步研究和努力的方向作了展望。更多还原

【Abstract】 Shanghai power grid is a typical electric power grid which is depended on external power serious and growing. As the load center, serious shortage of power supply is the greatest threat to security of Shanghai Power Grid. The Waigaoqiao power plant has land resources to construct two million units of capacity. At the same time it do not need a new corridor access to the 220kV grid because of a greater margin in the output line. In this article, Program of access to the 220kV power grid is designed, and an in-depth analysis and research is carried out.In this article, the status and development planning of Shanghai power grid is analyzed. Through the power balance analysis, it is concluded that the Waigaoqiao Power Plant’s expansion is necessary at the end of the "Eleventh Five-Year". The design of two million units of capacity access to the 220kV grid is described in detail, and the impact on operation mode and wiring is introduced. It describes the method of calculating power flow and short-circuit current. The calculation results after the Waigaoqiao expansion access to the 220kV power grid is given. In addition to considering of the power flow reasonable, the safe operation of the main equipment in the power grid after tripping is also checked., and the power flow of the main line does not exceed the limit. By adjusting the existing power grid connection and operation to meet the requirements of short-circuit capacity constraints. The feasibility of the design program is verified. The suggestion of replacing the conductor cross-section line and adjusting operation mode and the wiring is given. Finally, the next step in the direction of research and efforts is made by outlook.更多还原