期刊
ELECTRIC POWER SYSTEMS RESEARCH
卷 173, 期 -, 页码 271-280出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.epsr.2019.04.039
关键词
Current control; Fault-ride-through; Photovoltaic; Micro-grids; Large-signal analysis
This paper presents a new control strategy for low-voltage ride-through for 3-phase grid-connected photovoltaic systems. The proposed fault ride through control algorithm, which is designed based on mixed potential function, can protect the inverter from overcurrent failure under both symmetric and asymmetric faults, reduce the double frequency oscillation and provides reactive power support by applying a voltage compensation unit. With the proposed method, the inverter can also inject sinusoidal current during asymmetric faults. The method does not require a hard switch to switch from the Maximum Power Point Tracking (MPPT) to a non-MPPT algorithm, which ensures a smooth transition.
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