双馈风力发电机组对系统阻尼影响及附加阻尼控制研究

发布时间：2018-04-19 16:10

本文选题：双馈风力发电机组 + 阻尼转矩分析法　；参考：《华北电力大学》2017年硕士论文

【摘要】：由于传统能源的不可再生性及环境的破坏,我国可再生能源装机容量屡创新高,更多的新能源出力对电网运行的稳定性和可靠性带来了新的挑战。可再生能源发电中,风能成为新能源发电的主力,大规模风电的接入,降低了系统的惯性和阻尼,对系统安全运行稳定性产生巨大影响,其中低频振荡是稳定性研究中重要问题之一,在我国智能电网和能源互联网建设过程中,此问题急需解决,因此本文进一步探讨了大规模风电接入对系统阻尼影响及相应的抑制措施,具有极为重要的实际意义和理论意义。本文首先详细地介绍了双馈风力发电机组的数学模型,采用阻尼转矩分析法推导得到含双馈风力发电机组的风电场对单机无穷大系统提供的正阻尼转矩条件,为后面通过调节风电场出力抑制系统功率振荡提供理论依据。而后,本文结合数据驱动理念,利用子空间辨识法的优点,引入自抗扰控制方法设计了一套工程实用性强,不依然与被控对象数学模型的自抗扰控制器。自抗扰控制器设计中不需要被控对象模型,但是通过辨识得到的低阶数学模型依然处在误差较大的问题。最后,针对以上问题,本文考虑定子电压锁相环的功能建立被控对象的数学模型,同时设计出机侧换流器和有功无功附加阻尼无源控制器,并结合相关仿真算例验证本文设计的控制器的有效性。
[Abstract]:Due to the non-reproducibility of traditional energy and the destruction of environment, the installed capacity of renewable energy in China has repeatedly reached a new high, and more new energy sources have brought new challenges to the stability and reliability of power grid operation.In the renewable energy generation, wind energy becomes the main force of the new energy generation. The large-scale wind power access reduces the inertia and damping of the system, and has a great impact on the safety and stability of the system.Among them, low frequency oscillation is one of the most important problems in stability research. In the process of smart grid and energy Internet construction in China, this problem needs to be solved urgently.Therefore, this paper further discusses the influence of large-scale wind power access on system damping and the corresponding suppression measures, which is of great practical and theoretical significance.In this paper, the mathematical model of doubly-fed wind turbine is introduced in detail, and the positive damping torque condition of wind farm with doubly-fed wind turbine is derived by using damping torque analysis method.It provides a theoretical basis for suppressing the power oscillation of the system by adjusting the wind farm output.Then, combining the idea of data drive and using the advantage of subspace identification method, this paper introduces the active disturbance rejection control method to design a set of active disturbance rejection controller which has strong engineering practicability and is not still in line with the mathematical model of the controlled object.There is no need for the controlled object model in the design of the ADRC, but the low order mathematical model obtained by identification is still in the problem of large error.Finally, considering the function of the stator voltage phase-locked loop (VPLL), the mathematical model of the controlled object is established in this paper. At the same time, a side converter and a passive controller with active and reactive power plus damping are designed.The effectiveness of the controller designed in this paper is verified by a related simulation example.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM315

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