The voltage collapse loss is evaluated based on risk assessment theory and post-contingency state transition analysis, by which economic assessment for security benefit of dynamic voltage support can be realiz.

The study reveals that the voltage support in the inverter is the main limiting factor for the eff.

The paper puts forward the voltage support strategies after a series studies of a week AC system.

The advantages of VSC-HVDC is analyzed in this paper, and the transient stability, voltage support, and short-circuit current of VSC-HVDC in urban high voltage power network by PSS/E are simulated.

It puts forward that when skating from a low speed to a high speed,in the relationship between step frequency and step speed,way of dynamic support follows way of fixed-point support,but in the relations of step length and step speed,it is opposite.

Aimed at controlling rocks in soft and thick coal seams, according to the occurrence of coal seam in 11151 working face in Liangbei coal mine, Shenhuo group, Henan province, the influence law between mining thickness, coal mass strength and the abutment pressure, rock deformation was simulated and analyzed with Flac 5.

In order to understand the abutment pressure distribution regularity of work face and its effect on the roadway group under mining,the lateral abutment pressure of Xinzhuang Mine working face was observed by the ZYJ rigid drilling stress sensor and "ten words method".