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摘要本文简单的了解了一些关于电力系统的基本理论。包括电压失去稳定的动态和静态机理、hopf分岔和鞍结分岔，然后依次从不同的方向探讨导致电压失去稳定甚至电压崩溃的原因，它非常完美地结合了静态分析和动态分析方法，可以用来研究电压稳定性问题，特别是光伏并网后的电力系统，然后运用潮流计算等方法来分析和推导，创建经典3节点系统ODE方程。再结合光伏电源对方程进行修改，最后得到以光伏电站为恒定功率的负荷的ODE模型，然后，使用仿真软件MATCONGT对此模型进行仿真。运用MATCONT软件对其进行仿真。其次还介绍了几种仿真方法，通过线性反馈控制，能有效的延迟分岔避免电压失稳和电压崩溃。46513
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本文的研究内容和研究结果：
（1）当电网中负载过多的时候，随着系统的有功功率功率的增加会造成电压的降低。
（2）无功需求过高的时候。系统电压会不断下降然后出现鞍结分岔的现象。
（3）给电网增加线性反馈控制之后，能有效得延迟分岔点，从而避免电压失稳或者电压崩溃。
毕业论文关键词 ： 光伏发电并网系统；电压稳定；分岔研究
Abstract In this paper, a simple understanding of the basic theory of the power system. Dynamic and static mechanism, Hopf bifurcation and saddle node bifurcation including voltage loss. Then, from different directions, the reason of voltage instability and voltage collapse is discussed. It combines static analysis and dynamic analysis. Can be used to study the problem of voltage stability. Especially after the grid connected photovoltaic power system. Then use the method of power flow calculation to analyze and deduce. Create the classic 3 node system ODE equation. Then the equation is modified by the photovoltaic power supply, and finally the ODE model with the load of the photovoltaic power station as a constant power is obtained. Then, the simulation software MATCONGT is used to simulate the model. Using MATCONT software to simulate it. Secondly, several simulation methods are introduced. Through the linear feedback controlHopf bifurcation and saddle node bifurcation including voltage loss. Then, from different directions, the reason of voltage instability and voltage collapse is discussed. It combines static analysis and dynamic analysis. Secondly, everal simulation methods are introduced. Through the linear feedback controlHopf bifurcation and saddle node bifurcation including voltage loss. Then, from different directions, the reason of voltage instability and voltage collapse is discussed. It combines static analysis and dynamic analysis. Can be used to study the problem of voltage stability. Especially after the grid connected photovoltaic power system. Then, the simulation software MATCONGT is used to simulate the model. Using MATCONT software to simulate it. Secondly, several simulation methods are introduced. Through the linear feedback control,,he delay bifurcation can be effective to avoid voltage instability and voltage collapse.
Research contents and results of this paper:
(1) when the load is too much in the power grid. With the increase of the active power of the system, the voltage will be reduced.
(2) when the demand for reactive power is too high. System voltage will continue to decline and then there will be the phenomenon of saddle node bifurcation.
(3) adding a linear feedback control to the power grid. Can effectively delay the bifurcation point, so as to avoid voltage instability or voltage collapse.
Key words: Hhotovoltaic grid connected system, Voltage stability, Bifurcation study
目 录
第一章 绪 论 1
1.1 引言 1
1.2 课题背景与研究意义 1
1.3 光伏发电并网系统分岔研究的发展及现状 2
1.4 本文的主要工作 2