Jingen Guo’s scientific contributions

This paper constructs a security transmission model to calculate the power data, uses cluster analysis to analyze and integrate the collected data, and forms a security transmission fuzzy set, so as to construct a security system to realize the security transmission of power data information. Multiple tasks in the heterogeneous platform are represented using acyclic graph DAG, and suitable CPUs are classified according to the task characteristics. Two optimization objectives, minimizing the average completion time of the task and maximizing the security guarantee factor of the task, are proposed, and a mathematical model is established. According to the actual application of power IoT information security service, create and match the computing nodes. Use the QPSO algorithm to complete task scheduling and realize the optimization of task completion time. Construct an environment that simulates the operation of electric power IoT and analyze the performance of the constructed model. Simulation experiments show that the interception probability is significantly reduced when using the VCM threshold transmission control scheme compared with the probability of not using the VCM threshold transmission control scheme, from a probability of more than 90% to 0~20%, thus indicating that the VCM threshold transmission control scheme can effectively improve the security of information transmission. Comparing the load rate of computing nodes of the three algorithms, the real-time load of this paper’s algorithm floats within the range of 58%~78%, and the real-time load changes are smoother, and this paper’s algorithm is more suitable for the scheduling scenario of the Internet of Things in electric power.

This article introduces a new method for identifying anchor damage faults in fiber composite submarine cables. The method combines the Volterra model of Variation Mode Decomposition (VMD) with singular value entropy to improve the accuracy of fault identification. First, the submarine cable vibration signal is decomposed into various Intrinsic Mode Functions (IMFs) using VMD. Then, a Volterra adaptive prediction model is established by reconstructing the phase space of each IMF, and the model parameters are used to form an initial feature vector matrix. Next, the feature vector matrix is subjected to singular value decomposition to extract the singular value entropy that reflects the fault characteristics of the submarine cable. Finally, singular value entropy is used as a feature value to input into the Support Vector Machine (SVM) for classification. Compared with Empirical Mode Decomposition (EMD) and Ensemble Empirical Mode Decomposition (EEMD), the proposed method achieves a higher fault identification accuracy and effectively identifies anchor damage faults in submarine cables. The results of this study demonstrate the feasibility and practicality of the proposed method.

The present study highlights the significance of conducting the appropriate seismic design of substation buildings. First, the seismic damage of substation buildings during past several earthquakes is summarized to illustrate the damage features of common substation buildings. Then, the current seismic practice of substation buildings is presented, focusing on the seismic performance of substation buildings in some numerical and experimental studies. At last, the research trend from performance-based design to resilience-based design of substation buildings is discussed to shed a light the development of seismic design of substation buildings.KeywordsSubstationSeismic designResilienceEarthquake damage

Due to the shallow burial depth, the concrete duct bank for underground cables frequently encountered differential settlement, tilt and other damage like cracking when construction activity was carried out in the vicinity. This paper briefly presents an experimental study of concrete duct bank with a 1/4 part of real structure under a monotonic static loading, which was put into a soil box in the laboratory. And then numerical simulations were performed for the 1/4 part of real structure and a real-scale concrete duct bank respectively, to investigate the deformation and damage pattern of concrete structure and the wrapped inside conduits. Both the test and numerical results indicated that the failure of concrete duct bank presented a distinct brittle pattern. The mechanical properties of underlying soil play a more dominant role in the bearing capacity, mid-span vertical displacement and mid-span deflection of concrete duct bank. It is proposed that the vertical displacement of concrete duct bank can be set as the monitoring item to reveal its safety state, and the minimum curvature radius of longitudinal deformation profile obtained from vertical settlement at different locations can be computed and be taken as the control index.

Working shafts or manholes, usually made of concrete or reinforced concrete, are essential parts of the underground electrical power transmission system. However, the working shaft frequently encountered differential settlement, tilt and other damage like cracking when construction activity was carried out near the high-voltage electricity cables. This paper reported a severe damaged working shaft in South China including its settlement and cracks. Numerical simulation was also performed to reveal the evolution of structural damage with an increased differential settlement. The results show a good agreement with field observation in respect to the initiation of concrete tension damage. It is proposed that if a differential settlement higher than 5mm is observed, preventative measures are needed and the risk is conditional acceptable.