Wanda Group (China)

The fast rise of China's real estate business has efficiently propelled the country's economy, and it is also profoundly entwined with the daily lives of the Chinese populace. There are more investment risks associated with real estate projects due to the size of the investment funds, the length of time required to accomplish the task, the effect of regulatory changes, the market climate, and other variables. If these risks are not appropriately managed, they will lower the investment's return. Real estate project investments should be more cautious and scientific, fully assess investment risks, and target the appropriate control measures to reduce the impact of risk factors and ensure the smooth implementation of investment activities. This is particularly crucial in light of the new normal, which involves increased uncertainty.

This paper analyzes the neutral current reduction performance of a three-phase four-leg solid state transformer (SST) under different degrees of unbalanced load. Several kinds of control strategies are presented, such as the neutral current elimination controls that rely on phase shifting, voltage amplitude, phase shifting, and voltage amplitude combination control. A neutral current minimization control, which ensures the SST output voltages complying with the EN 50160 output voltage unbalance standard, is also developed. These control approaches simply build on the balanced voltage control providing voltage references which slightly unbalance the voltage amplitude and phase angle or both. The effectiveness of the proposed strategies is validated through tests on a downscaled prototype. Simulation results for the neutral current minimization control of the SST applied to a real urban distribution network with distributed loads are presented. The results of this analysis show that overall the neutral current minimization results in an energy saving from both reduced losses in the distribution cables and reduced power consumption in the load.

With the rapid development of traffic, highway users' demand for highway is no longer just a passageway between two points, but an important landscape element in the highway environment. Based on the analysis of the relevant research at home and abroad, the GIS technology is used to identify the ecological information in the road area, the spatial superposition analysis of the remote sensing image in the road area and the GIS is studied, the remote sensing image before and after the highway construction is compared, the influence of the highway landscape is studied, and the geographical information system is studied and evaluated. It improves the rationality and accuracy of ecological information extraction, classification and analysis, and provides strong technical support and methods for objective, comprehensive and accurate analysis of ecological changes before and after highway construction.