Ultra-high voltage(UHV)transmission lines are an important part of China’s power grid and are often surrounded by a complex electromagnetic environment.The ground total electric field is considered a main electromagn...Ultra-high voltage(UHV)transmission lines are an important part of China’s power grid and are often surrounded by a complex electromagnetic environment.The ground total electric field is considered a main electromagnetic environment indicator of UHV transmission lines and is currently employed for reliable long-term operation of the power grid.Yet,the accurate prediction of the ground total electric field remains a technical challenge.In this work,we collected the total electric field data from the Ningdong-Zhejiang±800 kV UHVDC transmission project,as of the Ling Shao line,and perform an outlier analysis of the total electric field data.We show that the Local Outlier Factor(LOF)elimination algorithm has a small average difference and overcomes the performance of Density-Based Spatial Clustering of Applications with Noise(DBSCAN)and Isolated Forest elimination algorithms.Moreover,the Stacking algorithm has been found to have superior prediction accuracy than a variety of similar prediction algorithms,including the traditional finite element.The low prediction error of the Stacking algorithm highlights the superior ability to accurately forecast the ground total electric field of UHVDC transmission lines.展开更多
The proliferation of ultra-high voltage direct current(UHVDC)transmission technology has heightened regulatory oversight of electromagnetic fields around buildings.In conventional direct current(DC)line design,the pre...The proliferation of ultra-high voltage direct current(UHVDC)transmission technology has heightened regulatory oversight of electromagnetic fields around buildings.In conventional direct current(DC)line design,the presence of residential areas was typically not taken into account.GB 39220-2020 now requires environmental assessments for residential balconies and platforms.The impact of nearby residential buildings has to be taken into account during the design of DC lines,necessitating the calculation of the three-dimensional total electric field.This study introduces a parallel charge simulation method-flux tracing method to quickly calculate the 3D total electric field near buildings in proximity to UHVDC lines,which is crucial for engineering design and environmental assessment.The method significantly speeds up calculations,with a 4-15 times faster ratio using 16-32 threads.It also analyses how UHVDC line dimensions,distances to buildings and parameters of residential buildings affect the maximum electric field on platforms.By using regression analysis,the formula for predicting the maximum electric field is obtained,and the traditional calculation time is improved.This advancement provides efficient predictions and detailed 3D electric field distributions for engineering and environmental assessments.展开更多
基金funded by a science and technology project of State Grid Corporation of China“Comparative Analysis of Long-Term Measurement and Prediction of the Ground Synthetic Electric Field of±800 kV DC Transmission Line”(GYW11201907738)Paulo R.F.Rocha acknowledges the support and funding from the European Research Council(ERC)under the European Union’s Horizon 2020 Research and Innovation Program(Grant Agreement No.947897).
文摘Ultra-high voltage(UHV)transmission lines are an important part of China’s power grid and are often surrounded by a complex electromagnetic environment.The ground total electric field is considered a main electromagnetic environment indicator of UHV transmission lines and is currently employed for reliable long-term operation of the power grid.Yet,the accurate prediction of the ground total electric field remains a technical challenge.In this work,we collected the total electric field data from the Ningdong-Zhejiang±800 kV UHVDC transmission project,as of the Ling Shao line,and perform an outlier analysis of the total electric field data.We show that the Local Outlier Factor(LOF)elimination algorithm has a small average difference and overcomes the performance of Density-Based Spatial Clustering of Applications with Noise(DBSCAN)and Isolated Forest elimination algorithms.Moreover,the Stacking algorithm has been found to have superior prediction accuracy than a variety of similar prediction algorithms,including the traditional finite element.The low prediction error of the Stacking algorithm highlights the superior ability to accurately forecast the ground total electric field of UHVDC transmission lines.
基金Supported by State Grid Corporation of China(5200-202355390A-2-4-KJ).
文摘The proliferation of ultra-high voltage direct current(UHVDC)transmission technology has heightened regulatory oversight of electromagnetic fields around buildings.In conventional direct current(DC)line design,the presence of residential areas was typically not taken into account.GB 39220-2020 now requires environmental assessments for residential balconies and platforms.The impact of nearby residential buildings has to be taken into account during the design of DC lines,necessitating the calculation of the three-dimensional total electric field.This study introduces a parallel charge simulation method-flux tracing method to quickly calculate the 3D total electric field near buildings in proximity to UHVDC lines,which is crucial for engineering design and environmental assessment.The method significantly speeds up calculations,with a 4-15 times faster ratio using 16-32 threads.It also analyses how UHVDC line dimensions,distances to buildings and parameters of residential buildings affect the maximum electric field on platforms.By using regression analysis,the formula for predicting the maximum electric field is obtained,and the traditional calculation time is improved.This advancement provides efficient predictions and detailed 3D electric field distributions for engineering and environmental assessments.
