The reactive power compensation design and operation method of ultra-high voltage(UHV) grids based on the economic voltage differences was introduced,and was proved to be practical,operable and scientific by an example.

Considering the hidden danger of the voltage stability failure in China power grid,a real-time monitoring and control method of the power system reactive power flow based on the economic voltage difference(△UJ) theory is discussed.

In this method, the actual value of the real time reactive power input by every power plant and substation into the power system is regulated, based on its bias from the optimal value calculated through the ΔU J OPF program, to be made approximate to the optimal calculated value, thus ensuring the systems ope.

Gives a brief introduction to the functions of the optical lens economic tolerance program.

0 and GIS techniques to analysis the spatial pattern of regional economic development,the process of the changes of regional economic differences in Henan province.

Ethnic issues turned out to be the issues of development while the economic disparity is the key disparity in development.

With the further Opening and Reformation,China s regional economic disparity is being enlarged.

An analysis of economic disparity between PRD and its surrounding regions;

his paper has chosen the time serious of 1990～2005 as study phase,GDP per capita as the major variable indicator for testing regional economic disparity,the sufficient evolutional characters of which in Fujian province has been analyzed using Theil index in the 1990s.