Reliability Assessment Method for Wind Turbine and Energy Storage Sequence Construction of Distribution Networks

Abstract

The invention discloses an assessment method for time sequence construction reliability of a wind turbine generator and the energy storage of a power distribution network, and the method comprises thesteps of obtaining the basic data of any time sequence construction scheme of the wind turbine generator and the energy storage of the power distribution network, and determining the configuration capacity and configuration position of the wind turbine generator and the energy storage corresponding to each intermediate construction year in the planning; calculating the reliability index of the power distribution network in each construction stage in the time sequence construction scheme; calculating a power distribution network reliability Talr coefficient of the time sequence construction scheme; and obtaining the reliability Talr coefficients of the plurality of time sequence construction schemes, and taking the time sequence construction scheme corresponding to the minimum reliabilityTalr coefficient as the time sequence construction scheme with the optimal reliability of the wind turbine generator and energy storage of the power distribution network. According to the method, thereliability Talr coefficient is adopted as an evaluation index of the reliability of the time sequence construction scheme, so that the risks brought to the overall reliability of the scheme due to the existence of a construction stage with poor reliability are avoided, and the method has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of distribution network planning, and in particular relates to a method for evaluating the reliability of time-sequence construction of wind turbines and energy storage based on a distribution network. Background technique [0002] In distribution network planning, the reliability factor of distribution network construction is an important aspect to be considered in distribution network planning. Distribution network planning is generally divided into static planning and multi-stage dynamic planning. The former only seeks the optimal network and the optimal configuration of distributed power at the end of planning, while the latter requires a comprehensive evaluation strategy for each stage. Due to the long construction period of multi-stage construction of distribution network, it is necessary to evaluate the overall reliability of the timing construction scheme of wind turbines and energy storage in distri...

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Problems solved by technology

The reliability evaluation based on the analytical method has clear principles and accurate calculation results. However, the analytical method has a large amount of calculation and is only suitable for reliability evaluation of distribution networks with a small scale. For large-scale distribution networks, the analytical method is used. The evaluation is prone to the curse of dimensionality, so the simulation method is usually used to evaluate the reliability of the actual distribution network

[0005] (2) The existing distribution network reliability evaluation method is mainly to separately verify multiple stages of distribution network operation, and it is impossible to comprehensively evaluate the overall reliability of the multi-stage planning scheme of the distribution network

[0007] In addition, for distribution network operators, directly using the load shedding penalty cost to evaluate the reliability of the timing construction scheme of wind turbines and energy storage in the distribution network is an indirect influence on the reliability of the timing construction scheme of wind turbines and energy storage in the distribution network. Although this can quantitatively reflect the reliability of the system, it cannot directly reflect the reliability characteristics of the distribution network, which is not conducive to the control of the distribution network operators when the system is in an abnormal state.

[0008] (4) In the traditional construction planning of wind turbines and energy storage in the distribution network, for the reliability evaluation of the construction schemes of different construction time sequences of wind turbines and energy storage, only the reliability of the initial year and the target year of the construction scheme are considered. sex

According to such an evaluation method to evaluate multiple time-series construction schemes, the optimal time-series construction scheme of wind turbines and energy storage only takes into account the reliability of the initial year and the target year. When the distribution network in the construction scheme is in a certain When the construction stage has low reliability, this stage with low reliability will affect the reliability level of the timing construction scheme of wind turbines and energy storage in the entire distribution network

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