特高压多端直流输电工程在大规模电力系统中的应用

发布时间：2018-03-03 13:26

本文选题：多端直流　切入点：PSS/E　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：为了研究多端直流输电系统在大规模电力系统中的应用,本文主要进行了以下几部分的工作。 1、介绍了多端直流的应用需求和前景,描述了几个现有的多端直流输电实际工程的概况,总结概括了多端直流的工作原理,包括换流器技术、接线方式和控制协调方式等。实际工程经验和研究结果表明并联式多端直流输电系统线路损耗小,功率控制容易,工程扩建灵活性较高,运行相对比较稳定,是大多数工程中最为常见的一种连接方式。 2、详细地介绍了电力系统仿真软件PSS/E中的多端直流系统结构,包括稳态潮流计算和动态模型,重点介绍了三种多端直流模型(MTDC01、MTDC02和MTDC03)正常工况下的控制方式和故障下的闭锁和重启动逻辑,针对定电流控制(CC)、定电压控制(CV)和低压限流环节进行了具体阐述,并给出了PSS/E中多端直流稳态数据卡和动态模型卡的具体意义和填写说明。 3、构建了一个含多端直流的八机两区域实验系统和一个宁夏至浙江三端直流输电系统,其中前者为基于四机系统的实验系统,后者为基于实际工程的假想系统,并对两个系统中的多端直流进行了交直流系统故障仿真,并分析了不同故障下系统典型发电机功角、联络线潮流、主要母线电压和直流系统的动态响应结果。仿真结果验证了PSS/E的多端直流模型的特性和有效性,该多端直流模型能够很好地模拟多端直流正常运行和交直流故障下的动态响应,满足大规模电力系统仿真的需求,非常适合大规模复杂电力网络中多端直流的响应特性研究。
[Abstract]:In order to study the application of multi-terminal DC transmission system in large-scale power systems, the following parts of the work are carried out in this paper. 1. The application requirement and prospect of multi-terminal DC are introduced, the general situation of several existing multi-terminal HVDC transmission projects is described, and the working principle of multi-terminal DC is summarized, including converter technology. Practical engineering experience and research results show that parallel multi-terminal HVDC transmission system has low line loss, easy power control, high flexibility of project expansion, and relatively stable operation. Is the most common connection in most projects. 2. The structure of multi-terminal DC system in power system simulation software PSS/E is introduced in detail, including steady-state power flow calculation and dynamic model. This paper introduces three kinds of multi-terminal DC models MTDC01MTDC02 and MTDC03 under normal working condition and the logic of locking and restarting under fault, and describes the fixed current control, constant voltage control CVC) and low voltage current limiting link in detail. The significance and completion of multi-terminal DC steady-state data card and dynamic model card in PSS/E are also given. 3. An eight-machine and two-region experimental system with multi-terminal DC and a three-terminal HVDC transmission system from Ningxia to Zhejiang are constructed. The former is an experimental system based on four-machine system, and the latter is a hypothetical system based on actual engineering. At the same time, the fault simulation of multi-terminal DC / AC system in two systems is carried out, and the typical generator power angle and tie-line power flow of the system under different faults are analyzed. The main bus voltage and the dynamic response of DC system are obtained. The simulation results verify the characteristics and validity of the multi-terminal DC model of PSS/E. The multi-terminal DC model can well simulate the dynamic response of multi-terminal DC in normal operation and AC / DC fault. To meet the needs of large-scale power system simulation, it is very suitable for the research of multi-terminal DC response characteristics in large-scale complex power network.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM721.1

【参考文献】