【作者】 王路；

【导师】 李兴源；

【作者基本信息】 四川大学 ， 电力系统及其自动化， 2005， 博士

【摘要】 当今,越来越多的直流输电装置投入到国内电网中。在远距离输电和大型互联电网中起着很重要的作用。这些大功率电力电子元件装置大大增加系统动态性能的可控性,但其元件非线性特性也增加了精确分析和建模的困难。研究交直流系统的各种性态,也需要建立准确的仿真模型,电力系统交直流复杂系统为大型非线性瞬态系统,包含有大量物理意义相差很大的变量。传统的直流准稳态模型和机电暂态的模型已经不能满足精确分析系统的需要。因此需要建立准确电磁暂态和机电暂态混合模型,兼顾机电暂态便于进行大系统分析和电磁暂态分析中对直流非线性元件的精确描述的优点,用来精确地揭示非线性元件在大系统中的影响作用,如换相失败,自激振荡,和谐波不稳定等现象,为大型系统的精确分析和采取的一些相关措施提供有力的手段和工具。因此,交、直流互联电力系统的电磁暂态和机电暂态的混和仿真研究具有重要的理论意义和实用价值。 本文总结了国内外关于复杂电力系统建模、仿真计算,尤其是直流装置非线性元件仿真计算的相应研究成果,在现在常用的机电暂态和电磁暂态过程的分析手段的基础上,进行了以下研究工作: (1) 基于多速率方法(Multi-rate Method)提出交直流系统双速率相量-瞬时数据互馈的电磁暂态和机电暂态混合仿真计算方法。并且采用TSP初值确定和窗技术结合WRM方法设计具体的算法流程以及数据接口。在空间上对系统作出合理分割,子系统之间采用数据双向反馈,虚拟支路等技术。 (2) 以实际大系统作为研究对象,针对大系统的机电暂态仿真软件与可以更多还原

【Abstract】 With the process of national grid interconnection in recent years, the object of power system analysis has become large-scale interconnected grid. Besides, more and more HVDC transmissions lines have been built up and operated in domestic grid, which play an important role in long-distance transmission and sub-grids interconnection. These high-power electronic equipments improve the controllability of system dynamics, while the nonlinear quality of these equipments adds to the difficulties of modeling and accurate analysis. However, to investigate various characteristics of HVDC system, it is necessary to build exact simulation model. Difficulties He in that ac-dc hybrid systems are large-scale nonlinear transient systems which include many variables with different physical characteristics so that traditional HVDC quasi-steady model and AC phase model can no longer satisfy the need of exact simulation. So in this dissertation, appropriate modeling method which combines phase modeling and transient modeling is proposed to investigate the behavior of nonlinear devices in large-scale system, for example, commutation failure, self-excited oscillation, harmonic instability, etc, thus provides useful tool for the analysis and developing corresponding control measures in system.This paper summarizes the trends and development of large power system simulation, especial of HVDC. Based on the above, the research work for complex AC-DC system simulation is shown as follows:Based on the hybrid simulation method, Dual-time scale EMTP-TSP hybrid simulation method is proposed. This paper introduces successful theoretical results from parallel computing; multi-rate calculation and system partition thus describes basic principle and algorithm of multi-step hybrid simulation. Moreover, proper improvement is made according to characteristic of ac-dc system, including proper partition of large system, TSP initial value confirm, bilateral data feed between each sub-system, multi-rate computing, pseudo branch, WRM method and so on. At last comparisons are made between the new method and traditional one. This dissertation summarizes research produce about complicated power system modeling and simulating computation, especially on dc equipment composed of nonlinear devices.The primary objective of this thesis is to investigate the actual large-scale system and to update the measure of analyzing the dynamic phenomena, analyzing the various likely problems in the actual system and coming up with the corresponding restrain measure. At first, the dual time scale hybrid simulation technology applicable to the actual system is proposed. Besides, the simulation and analysis platform based on dual time scale and the precise model of the DC system is established in this paper. A lot of phenomena based on the actual South China Power Grid especially the phenomena of commutation failure which has impact on many lines have been studied and analyzed.The dual time scale hybrid simulation calculation strategy applicable to the actual engineering project is proposed, the Electric Mechanic transient simulation platform aimed at the large system and the Electric Magnetic transient simulation platform aimed at the detailed thyristor model are combined and utilize in the complex AC/DC system, and researches are made to study the arithmetic procedure and the data interchange technology. Moreover, the control strategy for multi-tie element-system method is brought forward. The model of FACTS devices are added in the large-scale power system, and investigated in detail. The principle and structure of trans-platform, multi computer group hybrid simulation is proposed.During the modeling of AC/DC system, the calculation of harmonic transfer and the phenomena of harmonic instability of DC facilities is preliminarily investigated. The combination of Electric Mechanic transient analysis and Electric Magnetic analysis based on the fundamental frequency wave is improved.This paper relies on the engineering project of network planning for China South Power Grid, improves the hybrid multi-rate simulation technology, build the hybrid simulation platform. The research results indicate that hybrid simulation is a effective method of disclosing the dynamic phenomena of power system which can provide some consultation for the improving stability and transfer capability of South China Power Grid, and ensuring the safe and reliable operation of power system.更多还原