微网仿真模型并行算法研究

发布时间：2018-03-12 15:51

本文选题：微网　切入点：实时仿真　出处：《天津大学》2014年硕士论文　论文类型：学位论文

【摘要】：微网系统的实时仿真是当前电力领域的发展方向,具有十分重要的理论意义与工程应用价值。对微网系统进行实时仿真不仅能够帮助认知微网系统中快动态过程,而且为保护设备和控制装置提供良好的测试平台。围绕着微网仿真模型并行算法这一主题,本文主要对微网一次系统的模型建立和求解过程进行了研究。提出了基于节点分析的暂态仿真的基本框架,具体包括通过差分方法将微网一次系统仿真模型转化为诺顿等效形式,并采用基于节点方程的电气系统的建模方法将系统转化线性方程组进行求解;给出了采用高斯消去法对线性方程组进行直接求解的方法,同时提出利用系数矩阵的稀疏性和对称性来提高求解速度;给出了非线性元件求解思路,包括补偿法和分段线性化方法。研究了适于微网系统仿真的元件模型与实现方法,对于分布式电源如光伏电池模型进行了简化,建立了方便易解的数学模型;对电力电子变流器采用详细模型的拓扑建模法,可以采用开关器件模型组合描述任何形式的电力电子装置;对于常规元件包括普通变压器、线路、普通开关、负荷以及交流侧供电端也提出了相应的建模方法,特别的考虑了变压器励磁支路的磁滞饱和特性。为提高仿真速度,研究了微网系统仿真的并行算法,采用特殊的小步长模型对电力电子开关电路进行建模以提升仿真效率,对电气系统中的其它元件以及控制系统则采用常规步长进行仿真,二者通过接口变压器实现接口。在此基础上提出了基于传输线分网的并行多速率电磁暂态仿真算法,使得整个系统能够解耦并行求解。最后通过对一个小型低压光伏微网系统算例的建模与仿真,综合研究并验证了本文算法的正确性和有效性。
[Abstract]:Real-time simulation of microgrid system is the development direction of power field, which has very important theoretical significance and engineering application value. Real-time simulation of micro-grid system can not only help to recognize the fast dynamic process in micro-grid system. It also provides a good test platform for protection equipment and control device. In this paper, the modeling and solving process of primary microgrid system is studied, and the basic framework of transient simulation based on node analysis is proposed. The first order system simulation model of microgrid is transformed into Norton equivalent form by difference method, and the system is transformed into linear equations by the method of electrical system modeling based on nodal equation. This paper presents a method of directly solving linear equations by using Gao Si elimination method, and proposes to improve the speed of solution by using the sparsity and symmetry of the coefficient matrix, and gives the train of thought of solving nonlinear elements. It includes compensation method and piecewise linearization method. The component model and realization method suitable for microgrid system simulation are studied. The distributed power source such as photovoltaic cell model is simplified and a convenient and easy to solve mathematical model is established. The topology modeling method of detailed model is used for power electronic converter, and the switching device model can be used to describe any kind of power electronic device. The corresponding modeling method for load and AC side power supply terminal is also proposed, especially considering the hysteresis saturation characteristic of transformer excitation branch. In order to improve the simulation speed, the parallel algorithm of microgrid system simulation is studied. The special small step model is used to model the power electronic switch circuit to improve the simulation efficiency, and the conventional step size is used to simulate the other components and control system in the electrical system. On the basis of this, a parallel multi-rate electromagnetic transient simulation algorithm based on transmission line branch network is proposed. The whole system can be decoupled and solved in parallel. Finally, through modeling and simulation of a small low-voltage photovoltaic microgrid system, the correctness and validity of this algorithm are comprehensively studied and verified.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM743

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