An accurate investment planning method for medium-voltage distribution network under the environment of electric transformation

Abstract

The invention provides an accurate investment planning method for medium-voltage distribution network under the environment of electric transformation, which comprises the following steps: dividing apower supply grid and a power supply unit; distribution network diagnosis; Forecast load distribution; classification and division of supply area in planning area; planning area substation optimization planning; constructing the target grid of medium voltage distribution network; constructing medium voltage distribution network frame in transitional year; Investment Estimation and Electrical Calculation Analysis of Planning Scheme; carry out power flow calculation, short-circuit current calculation and quantitative analysis of power supply safety for the planning area.

Description

Technical field [0001] The invention relates to a distribution network planning method, in particular to a precision investment planning method for a medium-voltage distribution network in an electricity reform environment. Background technique [0002] Under the background of the new round of power reform, how to better reflect the core values ​​of power companies, serve power users, and require power companies to better meet the power demand (load demand, power supply reliability, power quality) of users with different requirements? Carrying out accurate planning of distribution network and improving the investment efficiency of distribution network planning has become an important research direction. Implementing the strategic goals of power development requires speeding up the construction of a first-class modern distribution network, and a solid distribution network plan is required to give full play to the leading role of the plan. [0003] At present, the main problems exis...

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Problems solved by technology

[0003] At present, the main problems in the distribution network are: circuit crossing circuitous power supply, complex contact relationship, and difficult to find faults; heavy loads, light loads, and equipment that does not meet N-1 are relatively concentrated in areas with high load density, and equipment loads are not Balanced; the interval management is not in place, if the interval is exhausted, the substation is still lightly loaded

These problems lead to poor distribution network indicators, such as key indicators such as connection rate and supply transfer rate are lower than the requirements of the guidelines, and there is a lot of room for improvement of the distribution network structure

The traditional distribution network grid planning method lacks the mutual coordination of the power supply scope of each grid in the entire planning area, and does not reflect the planning concept of "technically feasible and economically optimal" on the basis of overall planning, and it is difficult to obtain an optimal grid division scheme. cause undue waste

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