Method for overall evaluation of power grid planning

Abstract

The invention provides a method for overall evaluation of power grid planning. The method comprises the steps of S1, analyzing N-1 and N-2 passing rates, a power flow distribution reasonableness index, a short circuit current reasonableness index, a variable capacitance load ratio and a power utilization reliability index, and evaluating power grid planning safety; s2, analyzing the static evaluation index, the dynamic evaluation index and the investment efficiency, and evaluating the power grid planning economy; s3, analyzing the admission capability of renewable energy sources, carbon emission and environmental influence, and evaluating the environmental protection property of power grid planning; s4, analyzing the maximum annual average growth rate, the load growth margin, the network expansion margin and the network renewable energy grid connection margin of the unified dispatching load, and evaluating the flexibility of power grid planning; and s5, synthesizing the evaluation results of the steps S1-S4 to form an overall power grid planning evaluation report;; and a basis is provided for selecting a most reasonable planning scheme by combining four types of evaluation indexesincluding a safety index, an economic index, an environmental protection index and a flexibility index.

Description

technical field [0001] The invention mainly relates to related fields such as power system operation analysis and reliability evaluation, and specifically relates to a method for overall evaluation of power grid planning. Background technique [0002] With the rapid development of new energy in my country, the randomness and intermittent nature of new energy output have brought a greater impact on the planning and operation of the power system. Due to the randomness, volatility and uncertainty of new energy output, large-scale new energy power generation grid connection will have a significant impact on the power output structure, operating form, energy saving and economical aspects of the power system: [0003] 1) When large-scale new energy is connected to the grid, the system has uncertainties not only on the load side, but also on the power generation side. Therefore, it is necessary to reserve more reserves to cope with the uncertainty of new energy output in dispatchi...

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Problems solved by technology

[0004] 2) The output of renewable new energy sources such as wind power and solar photovoltaic power generation depends on the weather conditions, and cannot be controlled like conventional units during dispatch operation. This brings many challenges to the dispatch operation of the system, including the impact on the start and stop of the unit, The demand for system peak-shaving capacity and peak-shaving capability, as well as the need for coordination and cooperation between different types of units, etc.

[0005] 3) Due to the low prediction accuracy of renewable energy output at present, the randomness and uncontrollability of renewable energy have brought many uncertain factors to the system scheduling operation. Objectively, the scheduling plan is required to be more flexible and able to accommodate various types of renewable energy. Possibility of output

[0006] At present, the power system operation simulation results cannot be effectively connected with the power flow calculation in power grid planning. The power flow calculation generally uses four typical methods: summer large, summer small, winter large, and winter small, which does not truly reflect the transmission channels or The section is heavily loaded, and the refinement level of power grid planning needs to be improved urgently. It is necessary to fully consider the random output characteristics of new energy in the stage of power grid planning scheme formulation and safety and stability verification, so as to improve the pertinence of power grid planning work

[0007] With the expansion of cross-regional power grid interconnection in my country, the increasingly complex grid structure, and the rapid development of new energy sources, the impact of multi-mode power supply operation modes on power grid operation modes will become more complex and diverse. The requirements of system planning analysis, the traditional manual decision-making method is difficult to adapt to the uncertainty analysis requirements brought about by the access of new energy, it is necessary to study the key technology of power grid planning based on the refined operation simulation technology of the power system

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