含双馈风电场系统的次同步振荡特性及抑制策略研究

发布时间：2018-06-27 19:13

本文选题：双馈风电场 + 串联补偿　；参考：《重庆大学》2014年硕士论文

【摘要】：随着风电机组单机容量和风电场规模的增大，风电场与电力系统的相互作用和影响逐渐增强，特别是随着风火打捆的输送方式的实施以及远距离、高串补度的点对网输电系统的规划，大容量风电场的并网运行可能存在加剧系统次同步振荡事故的风险，为了探究风电场并网后系统次同步振荡机理，提高大容量风电场并网安全稳定运行能力，本文以并网双馈风电场为例，研究含风电场的电力系统次同步振荡特性及其抑制策略。本文的研究内容主要包括以下几部分： ①根据推导的风力机传动链、双馈发电机、转子侧变频器、以及同步发电机等小信号模型，建立含双馈风电场的电力系统小信号稳定性分析的详细模型，并在DigSILENT/PowerFactory平台上搭建各主要部件模型和控制系统，为进一步开展次同步振荡特性研究奠定基础。 ②为了研究风电场并网对汽轮发电机次同步振荡影响，以IEEE第一标准测试为例，采用特征值分析方法，分析了含双馈风电场的系统次同步振荡模态，并通过时域仿真进行验证。在此基础上，研究双馈风电场不同运行点、风电场参与调度的无功大小对系统次同步振荡模态的影响规律。 ③为了提高大容量风电场参与系统次同步振荡的抑制能力，提出双馈风电场抑制系统次同步振荡的机理分析。通过引入有功-转速型和无功-转速型传递函数，分别推导了双馈风电场有功和无功功率对系统阻尼系数大小和性质的表达式，并获得其提供系统正阻尼的条件。 ④为了设计在全次同步频段提供有效正阻尼的附加阻尼控制策略，，根据获得的有功-转速型和无功-转速型传递函数的相角范围，通过PID相位补偿控制器的参数优化，分别提出了双馈风电场有功和无功功率附加阻尼控制策略，并与无抑制措施时的仿真效果进行对比。上述研究成果对风电并网后电力系统次同步振荡现象的分析和电力系统稳定运行具有重要的参考价值，将为抑制含风电场的电力系统次同步振荡策略研究奠定理论基础和决策支持。
[Abstract]:With the increase of wind turbine capacity and wind farm scale, the interaction and influence between wind farm and power system is gradually enhanced, especially with the implementation of wind and fire bundles transportation and long distance. In order to explore the mechanism of sub-synchronous oscillation in wind farm, the planning of point-to-grid transmission system with high series-compensation degree and the connection operation of large capacity wind farm may increase the risk of sub-synchronous oscillation accident of the system, in order to explore the mechanism of sub-synchronous oscillation of the system after the wind farm is connected to the grid. In order to improve the safe and stable operation ability of large capacity wind farm, this paper studies the subsynchronous oscillation characteristics of power system with wind farm and its suppression strategy, taking the grid-connected doubly-fed wind farm as an example. The main research contents of this paper are as follows: 1 according to the small signal model of wind turbine transmission chain, doubly-fed generator, rotor side converter and synchronous generator, etc. The detailed model of small signal stability analysis of power system with doubly-fed wind farm is established, and the main components model and control system are built on the platform of DigSIL / PowerFactory. In order to study the influence of wind farm grid on the subsynchronous oscillation of turbogenerator, the method of eigenvalue analysis is used to test the first standard test of IEEE. The subsynchronous oscillation modes of the system with doubly-fed wind farm are analyzed and verified by time domain simulation. On this basis, the influence of reactive power of wind farm on the mode of sub-synchronous oscillation is studied. 3 in order to improve the suppression ability of large capacity wind farm to participate in the sub-synchronous oscillation of the system, the influence of reactive power of wind farm on the mode of sub-synchronous oscillation is studied. In this paper, the mechanism of suppressing the sub-synchronous oscillation in a doubly-fed wind farm is presented. By introducing the transfer function between active power and rotational speed and reactive power and rotating speed, the expressions of the damping coefficient and the property of the active power and reactive power on the system are derived, respectively. In order to design an additional damping control strategy to provide effective positive damping in the full synchronous frequency band, according to the phase angle range of the active power-rotational speed transfer function and the reactive power-rotational speed transfer function, Through the parameter optimization of pid phase compensation controller, an additional damping control strategy for active and reactive power of doubly-fed wind farm is proposed, and the simulation results are compared with the simulation results without restraining measures. The above research results have important reference value for the analysis of sub-synchronous oscillation phenomenon of power system after wind power grid connection and the stable operation of power system. It will lay a theoretical foundation and decision support for the study of subsynchronous oscillation strategy of power system with wind farm.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614

【参考文献】