对称电压跌落下的光伏发电系统建模
首发时间:2018-06-11
摘要:随着光伏发电系统渗透率的不断提高,建立有效的光伏发电系统模型来刻画实际光伏发电系统的动态行为具有重要意义。为了解决这个问题,本文对光伏发电系统的主要模块光伏阵列、最大功率点跟踪和逆变控制器的设计分别建模,给出全故障穿越过程,包括故障发生前的稳定阶段,故障发生至故障清除期间的故障持续阶段,故障清除至有功功率和无功功率均恢复至稳态值的恢复阶段以及恢复阶段完成后的稳定阶段电流参考值,通过更新电流参考值来实现对称电压跌落下的光伏发电系统控制。最后该模型的准确性在光伏电站的现场试验中得到了验证。
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Modeling of PV Generation Systems under Balanced Voltage Dips
Abstract:With increasing penetration of photovoltaic (PV) generation systems, it is significant to develop effective models to characterize the dynamic behaviors of actual PV generation systems. To address this issue, this paper models the main modules of photovoltaic power generation system, including PV arrays, maximum power point tracking, and inverter controllers. The active and reactive current reference value during the whole low voltage ride through(LVRT) period, including the pre- and post-fault steady states, and fault-duration and fault-recovery transient states, are proposed and formulated. The unified controller for balanced voltage dips, is implemented by automatic updating of current references. The effectiveness and accuracy of the proposed model has been validated by field tests in PV power plants.
Keywords: Photovoltaic generation system Low voltage ride through Dynamic model Balanced voltage dips
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