自动电压控制对双馈风场小干扰阻尼影响分析

Influence of Automatic Voltage Control on Small-signal Stability of Doubly-fed Wind Farm

摘要:

为解决传统双馈风场中自动电压控制系统延迟较大、对系统影响不确定的问题，建立了包含自动电压控制的双馈风场并网系统小干扰分析模型。首先，在考虑自动电压控制中非线性环节的前提下，推导了含延迟环节的双馈风场并网系统的小干扰模型，利用线性化原理形成了双馈风场的小干扰模型，用于描述双馈风场阻尼转矩的表达式；然后，通过小干扰模型，获得了双馈风场有功增量和功角增量之间的表达式；最后，通过理论计算与仿真结果对比，验证了该模型的有效性。研究结果表明，所提模型能描述双馈风场在小扰动时的阻尼分量，为研究双馈风场稳定提供理论依据。

Abstract:

In order to solve the problems of large delay and uncertain impact on automatic voltage control system in traditional doubly-fed wind farm, a small interference analysis model for grid connected system of doubly-fed wind farm including automatic voltage control is established. Firstly, considering the nonlinear link in automatic voltage control, the small interference model for grid connected system of doubly-fed wind farm with delay link is deduced, and the small interference model of doubly-fed wind farm is formed by using the linearization principle to describe the expressions of damping torque of doubly-fed wind farm. Next, the expressions of active power increment and power angle increment of doubly-fed wind farm are obtained through the small interference model. Finally, the effectiveness of the proposed model is verified by comparing the calculation with the simulation results. The results show that the proposed model can describe the damping component of doubly-fed wind farm under small disturbance, which provides a theoretical basis for the study of doubly-fed wind farm stability.