并网逆变器发电系统稳定性分析方法综述
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摘要
随着新能源、储能以及柔性输配电技术的快速规模化利用,逆变器发电系统在电网中的占比越来越高。并网逆变器的低惯量、弱阻尼特性导致了传统电网的转动惯量相对减少,电网的安全稳定性随之下降。现有的并网逆变器发电系统稳定性分析方法主要包括基于微分-差分-代数模型的数值仿真方法、基于状态空间模型的时域分析方法以及基于阻抗模型的频域分析方法。论文分别综述了现有分析方法的基本原理、主要特点及其应用场景,指出了现有方法在应用过程中存在的问题。同时,还介绍了幅相动力学分析方法、静止同步发电机模型以及大信号稳定性分析方法等一些新的稳定性分析方法。最后指出,在应用过程中应充分考虑各种方法的优缺点及其最佳应用场景,将各种典型分析方法结合起来,进而可以从不同的角度来综合全面地认识并网逆变器发电系统的动态特性与稳定性。
With the large-scale development and utilization of renewable energy,storage and flexible transmission technologies,there are more and more grid-tied inverter power generation systems in the power grid. The low inertia and weak damping characteristics of grid-tied inverters lead to the relative reduction of the rotational inertia of the traditional power grid,and the safe and stable operation ability of the power grid is also reduced. The common stability analysis methods for grid-tied inverter systems mainly include the numerical simulation methods based on differential-difference-algebraic model,the time-domain analysis methods based on state space model,and the frequency domain analysis methods based on impedance model. This paper respectively summarizes the basic principles,main features and best application scenarios of the existing analysis methods,and points out some problems in the application.Meanwhile,this paper also introduces some new stability analysis methods such as amplitude phase dynamics analysis method,static synchronous generator model and large signal stability analysis method. Finally,this paper points out that the advantages and disadvantages of various methods and their best application scenarios should be fully considered in the practical application,the dynamic characteristics and stability of grid-connected inverter power generation system should be analyzed based on a combination of various typical analysis methods and a comprehensive understanding from different perspectives.
With the large-scale development and utilization of renewable energy,storage and flexible transmission technologies,there are more and more grid-tied inverter power generation systems in the power grid. The low inertia and weak damping characteristics of grid-tied inverters lead to the relative reduction of the rotational inertia of the traditional power grid,and the safe and stable operation ability of the power grid is also reduced. The common stability analysis methods for grid-tied inverter systems mainly include the numerical simulation methods based on differential-difference-algebraic model,the time-domain analysis methods based on state space model,and the frequency domain analysis methods based on impedance model. This paper respectively summarizes the basic principles,main features and best application scenarios of the existing analysis methods,and points out some problems in the application.Meanwhile,this paper also introduces some new stability analysis methods such as amplitude phase dynamics analysis method,static synchronous generator model and large signal stability analysis method. Finally,this paper points out that the advantages and disadvantages of various methods and their best application scenarios should be fully considered in the practical application,the dynamic characteristics and stability of grid-connected inverter power generation system should be analyzed based on a combination of various typical analysis methods and a comprehensive understanding from different perspectives.
引文
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