Development of low voltage ride through testing device for the grid-connected photovoltaic power station in high-altitude area

According to the newest published national standard, large-scale photovoltaic power station should meet the requirements of low voltage ride-through. In this paper, the low voltage ride through detection technology is investigated and the development scheme of detecting device for grid-connected photovoltaic power station in high-altitude area is also designed. Besides, the topology of detecting device and the testing methodology is illuminated. With impedance divider structure, fully automation design, the detecting device can implement multi-fold tests, which involve three-phase symmetrical drop test under 35kV or 10kV, two-phase interphase asymmetric drop test and single-phase grounding asymmetric drop test. The device is movable, with integrating all equipment in a closed container. The movability makes it very suitable for testing grid-connected photovoltaic in high-altitude area of northwest in China, which will ensure the grid-connecting quality of the photovoltaic power station and keep power grid running safely and stably.