双馈异步风力发电机控制策略研究

发布时间：2018-06-17 12:05

本文选题：双馈异步风力发电机 + Terminal滑模变结构控制　；参考：《南京理工大学》2014年硕士论文

【摘要】：双馈感应发电机(DFIG)最常见的运行方式是变速恒频运行(VSCF),采用双PWM变频器控制不仅可以独立调节发电机有功和无功出力,还减少了风力资源的浪费,在稳定性方面对电网有着卓效的贡献。论文研究了DFIG发电机侧和电网侧PWM变换器的控制策略,进一步研究了DFIG对于实际电网稳定性方面的影响。首先,研究了DFIG的特点、功率关系、电磁关系以及变速恒频运行的原理,搭建了DFIG的数学模型,为控制策略的研究提供了基础。其次,针对电网侧变换器,研究了其结构和原理,在矢量控制的基础上,采用快速Terminal滑模变结构控制设计了电网侧PWM变换器的电流环控制策略和电压环滑模变结构协调控制策略,构建了电网侧变换器控制模型,用Matlab建立一个电网侧变换器仿真系统,分析了2种电网侧PWM变换器的工作模式,对控制器的动态性能和稳定性进行了扰动分析,结果表明本文的控制策略较传统控制具有快速、超调量小、鲁棒性强的优点。接下来,研究了DFIG发电机侧变换器原理和结构,在矢量控制的基础上,改进了传统滑模变控制器,设计了其快速Terminal滑模变结构控制器,通过功率控制实现最大风能跟踪,设计了DFIG机侧变换器控制模型,用Matlab建立了一个DFIG发电机侧变换器仿真系统,研究了DFIG有功、无功独立控制效果,研究了DFIG并网前后的稳定性,结果表明本文控制能够实现DFIG有功、无功功率解耦控制,实现了DFIG变速恒频运行控制。最后,建立了一个单机无穷大系统,DFIG通过2个PWM变换器接入电网,在仿真基础上,验证了快速Terminal滑模变结构控制的双馈异步风力发电机的稳定效果,研究了DFIG对电网稳定性的影响。在此基础上,以华东电网为数据背景,以实际如东风电场为例分析了DFIG组成的风电场对江苏电网的影响,结果表明DFIG组成的风电场对电网的稳定性具有积极的作用。
[Abstract]:The most common operation mode of doubly-fed induction generator (DFIGG) is variable speed constant frequency control (VSCF). Using dual PWM inverter control can not only adjust the active and reactive power of generator independently, but also reduce the waste of wind power resource. It has a great contribution to the stability of the power grid. In this paper, the control strategy of DFIG generator side and power side PWM converter is studied, and the influence of DFIG on the power network stability is further studied. Firstly, the characteristics of DFIG, power relation, electromagnetic relation and the principle of variable speed constant frequency operation are studied, and the mathematical model of DFIG is built, which provides a basis for the study of control strategy. Secondly, the structure and principle of grid-side converter are studied. Based on vector control, The current loop control strategy and voltage loop sliding mode variable structure coordinated control strategy of power side PWM converter are designed by using fast terminal sliding mode variable structure control, and the control model of grid side converter is constructed, and a simulation system of power side converter is established by Matlab. The dynamic performance and stability of the controller are analyzed. The results show that the proposed control strategy is faster, less overshoot and more robust than the traditional control. Then, the principle and structure of DFIG generator side converter are studied. On the basis of vector control, the traditional sliding mode variable controller is improved, and its fast terminal sliding mode variable structure controller is designed. The maximum wind energy tracking is realized by power control. The control model of DFIG converter is designed, a simulation system of DFIG generator side converter is established by Matlab, the effect of DFIG active power and reactive power independent control is studied, and the stability of DFIG before and after connected to grid is studied. The results show that the DFIG active power and reactive power decoupling control can be realized in this paper, and the DFIG variable speed constant frequency operation control is realized. Finally, a single-machine infinite bus system named DFIG is established to connect to the power network through two PWM converters. On the basis of simulation, the stable effect of fast terminal sliding mode variable structure control doubly-fed asynchronous wind turbine is verified. The influence of DFIG on power grid stability is studied. On this basis, taking East China Power Grid as the data background and taking the actual Rudong wind farm as an example, the influence of DFIG wind farm on Jiangsu power grid is analyzed. The results show that the DFIG wind farm has a positive effect on the stability of power grid.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315

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