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Architectural topologies of low voltage distribution networks are hard to “figure out” and “poor in interaction”. Therefore， many topology identification methods have been proposed， most of which have been simulated rather than tested on lines. Thus， low-voltage distribution network topology identification technology testing is investigated using a next-generation true test platform. Firstly， the next-generation true test platform established in Wuhan UHVAC testing base is introduced. Then the test scheme of low-voltage distribution network topology identification technology is proposed. Finally， the test of low-voltage distribution network topology identification technology is carried out to verify the effectiveness of the carrier communication method in the topology identification method and the platform's superiority.

Purpose: We evaluated the feasibility and safety of using a new unibody outer double-branched stent-graft system to reconstruct the canine ascending aorta, aortic arch, and supra-aortic vessels. Materials and methods: The outer-branched stent-graft was a unibody design. The branched stent-graft consisted of a main stent-graft and 2 branches. The introducer system included a tri-channel catheter, 2 detachable sleeves, a front fixing device, a constraining wire, and a curved outer sheath. The branched stent-graft was loaded into the introducer system. Ten adult mongrel dogs underwent general anesthesia, and the branched stent-grafts were deployed into the canine ascending aorta, aortic arch, and supra-aortic vessels by the introducer system. All animals were followed up for 3 months. At the end of the follow-up period, computed tomographic angiography (CTA) was performed to observe the patency of the branched stent-grafts. Results: The mean operation time was 142.7±13.7 minutes. The mean fluoroscopy time was 20.73±2.22 minutes. The mean dosage of contrast agent was 95.9±8.7 mL. During the operation, the tri-channel catheters successfully paralleled the wires in the aorta. All 10 branched stent-grafts were successfully implanted into the canine ascending aorta and aortic arch. There were no symptoms of cerebral embolization and no incision infection during the follow-up period. Computed tomographic angiography and specimens showed that the branched stent-grafts and native vessels were patent, the inner surfaces of the branched stent-grafts were covered by neointima, and there was no retrograde aortic dissection in the ascending aorta. Conclusions: This animal research demonstrated that the unibody outer double-branched stent-graft system could be applied to reconstruct the canine ascending aorta, aortic arch, and supra-aortic vessels. Clinical Impact: Thoracic endovascular aortic repair has been the main treatment method for aortic aneurysms or dissections involving the descending thoracic aorta. However, the aortic arch and ascending aorta remain the last segments of the aorta without a validated and routinely used endovascular option. In this research, we designed a new unibody outer branched stent-graft system to reconstruct the distal ascending aorta, aortic arch and supra-aortic vessels. The unibody outer branched stent-graft system could be applied to treat aortic pathologies which involve the middle and distal proximal ascending aorta, aortic arch and proximal descending aorta. [ABSTRACT FROM AUTHOR]

Islanding operation will harm the safety and stability of the power system, in the occurrence of island operation which must be in the specified time to monitor it. Here, the logical regression algorithm is introduced into the islanding operation monitoring. First, an accurate distributed generation system model is established in Matlab environment. The model considers various possible island operating states, minimum monitorable area, multiple distributed power supplies, various operating conditions, and different network topologies, and then uses. The data feature quantity under various island operating conditions is trained in the TensorFlow environment. Finally, the trained model is used to monitor the islanding status. The results show the feasibility of the method.