Deformation monitoring of photovoltaic power stations and substations in Yangquan using time-series InSAR

Yangquan is rich in coal resources, and coal mining activities are frequent, which usually causes significant subsidence in the mining area. Substations and power stations around the mining area may be affected by subsidence. In this paper, the time series SAR images of the 25 Sentinel-1A satellite in Yangquan from January to November 2019 are obtained to monitor the deformation of substations and photovoltaic power stations by using the SBAS-InSAR technology. The results show that the deformation range of the study area is between -23.8cm and 11.2cm. In addition, there are multiple subsidence "bowl" due to coal mining. The deformation range of the feature points of the five substations in Wenchi, Niangziguan, Changling, Luhu and Ceshi is between -1cm and 1cm, which are in a stable state. However, there is a continuous linear subsidence phenomenon in Ququcheng photovoltaic power station. Among the Ququcheng three subsidence feature points, the maximum annual subsidence reaches more than 4cm. The main reasons for the subsidence are the gravity component of soil and the increased ground load caused by the power generation device in this area.