A method for quantitative evaluation of the dg grid-connected characteristics and receiving capacity of the distribution network containing dg
A technology of accommodating capacity and distribution network, applied in data processing applications, instruments, calculations, etc., can solve problems such as difficulty, subjectivity and discreteness of normalized values
Active Publication Date: 2020-09-01
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
Both the expert scoring method and the membership function method are concepts in the fuzzy comprehensive evaluation method. The expert scoring method can solve the evaluation of indicators without quantitative evaluation standards, but the normalized value inevitably has subjectivity and discreteness. sex
The membership function essentially reflects the gradual change of things, and the determination process of the membership function should be objective in nature. In solving practical problems, it is not easy to determine its accurate function through the gradual change model of the membership function
Method used
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Embodiment Construction
[0058] Taking the whole distribution network of a certain city as an example for analysis, before evaluating the indicators, it is necessary to determine the number, capacity and form of DG access.
[0059] (1) Output volatility C F
[0060] Select a typical daily output of the city’s operating DG to calculate the output volatility, calculate the output on the hourly time scale, draw the output volatility curve, and then calculate the hourly output volatility C F Index value.
[0061] Based on the required value of the DG output volatility index determined above, combined with the selected reduced half-normal membership function, and using the improved membership function normalization method, the scoring table for DG hourly output volatility is established as follows:
[0062] Table 3 Scoring table for hourly output volatility
[0063] Output volatility Membership function value ≤10％ 1 10％～30％ 1～0.6 30％ 0.6
[0064] The solution is a=0.1, k=...
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The invention relates to the research field of the large-scale access of distributed power supplies to a power distribution network and provides a method for quantitatively evaluating the DG grid-connected characteristics and the admitting ability of a DG-contained power distribution network. According to the method, the influences of the own unique output fluctuation and the intermittency of DG, the DG energy distribution features, and the adaptability condition of the accessed power distribution network on the power distribution network are analyzed, and then two assessment indexes and corresponding membership function models are provided, wherein the two assessment indexes are composed of the DG grid-connected characteristic and the acceptance capability of the power distribution network. In combination with the assessment indexes of the power distribution network, a complete set of comprehensive assessment index system for the DG-contained power distribution network is established. The comprehensive assessment for the DG-contained power distribution network is realized. Meanwhile, a theoretical basis is provided for the DG access and design scheme and the plan of the power distribution network.
Description
technical field [0001] The present invention relates to the research field of distributed generation (Distributed Generation, DG) large-scale access to the distribution network, and specifically relates to a method for quantitatively evaluating the DG grid-connected characteristics and acceptance capacity of the distribution network containing DG, which is suitable for The distribution network with DG is evaluated. Background technique [0002] Large-scale DG access will have an impact on the distribution network in many ways. Most of the research that has been carried out focuses on the evaluation of economics, technology, reliability, grid planning, and environmental impact; for DG characteristics, including DG itself The unique output fluctuation and intermittence, the characteristics of DG energy distribution and the adaptability of connecting to the distribution network have little evaluation on the influence of the distribution network. [0003] When carrying out comp...
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Login to View More IPC IPC(8): G06Q50/06G06Q10/06
CPCG06Q10/06393G06Q50/06
Inventor 李妍王洁王少荣杜明秋杨秉臻杨晨光黄彦璐盛梦雨刘婉兵叶玮佳余珏
Owner HUAZHONG UNIV OF SCI & TECH