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Stability assessment for transmission systems with large utility-scale photovoltaic units

机译：具有大型公用事业光伏装置的传输系统的稳定性评估

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Photovoltaic (PV) systems are gradually replacing conventional synchronous generators. However, reduced system inertia and lack of dynamic grid support from PV are the main issues that could have a detrimental impact on the transient response in power systems when critical contingencies arise. In this study, the authors modelled and analysed transient and small-signal stability for a representative transmission system with realistic loading scenarios and high PV penetration levels. First, system eigenvalues were calculated to identify critical modes. Thereafter, the results of the small-signal analysis were further expanded by performing transient simulations after critical contingencies. Such contingencies detrimentally excited the critical modes of the system. To carry out this analysis, they implemented a positive-sequence dynamic model of a utility-scale PV unit (USPVU) in the open programming environment MATLAB/Simulink. This dynamic model is based on a Western Electricity Coordinating Council (WECC) generic model (full converter model), which is suitable for electromechanical transient studies. Also included was the model of the PV array, dc–dc converter, and associated control systems. The most critical factors pertaining to the detrimental or beneficial impact of USPVUs on stability were the unit commitment and dispatch strategy and the protection/control strategy during voltage swell and dip events for equivalent PV penetration and loading scenarios.
机译：光伏（PV）系统正在逐步取代传统的同步发电机。但是，当出现紧急事故时，降低的系统惯性和PV缺乏动态电网支持是可能对电力系统瞬态响应产生不利影响的主要问题。在这项研究中，作者对具有实际负载情况和高PV渗透水平的代表性传输系统的瞬态和小信号稳定性进行了建模和分析。首先，计算系统特征值以识别关键模式。此后，通过在紧急情况后进行瞬态仿真，进一步扩展了小信号分析的结果。这种意外情况不利地激发了系统的关键模式。为了进行此分析，他们在开放式编程环境MATLAB / Simulink中实现了公用事业规模PV装置（USPVU）的正序动态模型。该动态模型基于西方电力协调委员会（WECC）通用模型（全转换器模型），该模型适用于机电瞬态研究。还包括光伏阵列，dc-dc转换器和相关控制系统的模型。与USPVU对稳定性的有害或有利影响有关的最关键因素是在等效PV穿透和负载情况下的电压骤增和骤降事件期间的机组承诺和调度策略以及保护/控制策略。

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