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首页> 外文期刊>IEEE Transactions on Energy Conversion >Inclusion of Current Limiter Nonlinearity in the Characteristic Analysis of Sustained Subsynchronous Oscillations in Grid-Connected PMSGs
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Inclusion of Current Limiter Nonlinearity in the Characteristic Analysis of Sustained Subsynchronous Oscillations in Grid-Connected PMSGs

机译：在网格连接的PMSG中持续的子同步振荡的特征分析中的集合限制器非线性

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摘要

The interactions between permanent magnet synchronous generators (PMSGs) and weak grids may cause negatively damped or growing subsynchronous oscillation (SSO). The growing-SSO would evolve into a sustained-SSO when it is predominantly governed by the nonlinearities in the PMSG's converter control, such as current limiter. Most of the existing frequency-domain modeling and stability analysis methods are in the small-signal sense and thus unable to consider the impact of such nonlinearities. Besides, these methods can hardly give vital information to characterize the sustained-SSO, for instance, the magnitude. This paper presents a detailed characteristic analysis of the sustained-SSO while accounting for the effect of current limiter nonlinearity. First, a single-input-single-output (SISO) frequency-domain model of the PMSG is developed. This SISO model comprises the transfer functions of outer-/inner-loop controls and phase-locked loop (PLL). The nonlinear part, i.e., current limiter, is incorporated into the model using the describing function (DF) method. Then, the equivalent transformation on the system's closed-loop characteristic equation is used to separate the SISO model into independent linear and nonlinear parts. This separation enables the use of the DF-based Nyquist criterion for evaluating the system stability and determining oscillation attributes, such as the magnitude and frequency. Both the analytic results and time-domain simulations reveal that the current limiter has a significant impact on the characteristics of the sustained-SSO.
机译：永磁体同步发电机（PMSG）和弱网格之间的相互作用可能导致带负阻尼或增长的子同步振荡（SSO）。当它主要由PMSG的转换器控制中的非线性主导地管辖，诸如电流限制器的非线性地管道，生长-SSO将进入缓慢的SSO。大多数现有的频域建模和稳定性分析方法处于小信号感，因此无法考虑这种非线性的影响。此外，这些方法几乎不能提供重要信息来表征持续的SSO，例如幅度。本文介绍了持续的SSO的详细特征分析，同时占限流量非线性的影响。首先，开发了一种单输入单输出（SISO）PMSG的频域模型。该SISO模型包括外圈/内环控制和锁相环（PLL）的传递函数。非线性部分，即电流限制器，使用描述函数（DF）方法并入到模型中。然后，使用系统闭环特性方程上的等效变换用于将SISO模型分离成独立的线性和非线性部件。该分离使得能够使用基于DF的奈奎斯特标准来评估系统稳定性和确定振荡属性，例如幅度和频率。分析结果和时域模拟都表明，电流限制器对持续的SSO的特性产生了重大影响。

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