Preliminary Study Of Urban Transmission Network Planning Under Market Economy And Environmental Protection

With the continuous improvement of the public demands for their own health conditions and living environment, how to speed up construction of power grids to ensure high quality and reliable supply of electricity at the same time, do a good job in environmental protection work and seek power grid development and environmental protection harmony has become the one of the top priorities of power grid enterprises.The traditional planning model meet the various technical constraints and seek the lowest investment and operating costs, while the new planning issue consider not only the uncertainty of the power construction, future load changes, power flow and power transactions, but also the factors of reliability, return on investment, environmental protection, land occupation and so on.On the environment, environmental factors will be divided into three broad categories: First, the radiation noise indicators, including indicators of the electric field, magnetic field indicators, radio interference and noise; Second, the channel covers an area of indicators, including indicators of overhead lines and underground cables square; third, the environmental indicators, including the sensitivity factor and coordination factor. All environmental factors are unified to establish an integrated environmental indicator. Establishment of environmental indicators consider two aspects, on the one hand is the impact to the crowd, on the other hand, the number of affected populations. Taking into account environmental factors, we establish the substation environmental planning and environmental planning model grid. The planning model taking into account the uncertainty of the electricity transmission networks is established to adapt to the uncertainty condition in the future load fluctuations by remaining transmission capacity in the planning of the network. In this model, the introduction of a line load rate and regional load growth constraints, make the new model of network planning programs adapt to the effect of the slightly uncertain long-term fluctuations in the region and some short-term load substantial growth of the various load points in the future.Finally, the network planning model of environmental protection and uncertainty load factors is established considering the load uncertainties and environmental factors. Considering the environmental factors and load uncertainty, calculate the future results of years of network planning in a district of Shanghai, and compared it with the traditional deterministic model. The result shows the necessity and effectiveness to plan environmental factors and the uncertainty.