Calculation method for distributed photovoltaic three-phase access capacity distribution

A distributed photovoltaic, access capacity technology, applied in the direction of reducing the asymmetry of the polyphase network, eliminating/reducing the asymmetry of the polyphase network, AC network circuit, etc., can solve the optimization results limitation, imperfection, low feasibility, etc. question

Inactive Publication Date: 2020-10-20
STATE GRID CORP OF CHINA +2
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Problems solved by technology

The existing optimization model does not take into account the three-phase unbalance degree of the established distribution network in reality, and the rigid index problem of the actual poli

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  • Calculation method for distributed photovoltaic three-phase access capacity distribution
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  • Calculation method for distributed photovoltaic three-phase access capacity distribution

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[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0046] Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art wi...

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Abstract

The invention provides a calculation method for distributed photovoltaic three-phase access capacity distribution, and relates to the technical field of photovoltaic power generation. The calculationmethod comprises the following steps: establishing a three-phase balanced distributed photovoltaic access capacity distribution model; solving model with a penalty function, wherein the penalty function comprises an objective function maxf (PPV) and an obstacle function g, the objective function maxf (PPV) is the maximum three-phase photovoltaic access quantity, and the obstacle function g comprises a three-phase current unbalance constraint function, a common connection point voltage deviation constraint function, a photovoltaic access capacity constraint function and a distribution transformer capacity constraint function. According to the calculation method, the distributed photovoltaic optimal configuration in a power distribution network can be researched from the perspective of three-phase current imbalance; therefore, the safety and reliability of the power distribution network are ensured, three-phase imbalance caused by significant influence on power quality of the power distribution network due to large-scale multi-point access of distributed photovoltaic to the low-voltage power distribution network is avoided, the original three-phase imbalance condition is improved tothe greatest extent, the network loss is reduced, and the high practicability is achieved.

Description

technical field [0001] The present invention relates to the technical field of photovoltaic power generation, in particular to a calculation method for distributed photovoltaic three-phase access capacity allocation. Background technique [0002] In the early days of rural distribution network construction, because technicians did not consider the three-phase load balance problem when connecting the three-phase leads of the power grid to farmers, the problem of three-phase imbalance in the distribution network was prominent, resulting in high network loss and poor power quality. With the implementation of the distributed photovoltaic poverty alleviation policy, the unbalanced situation of three-phase voltage and current can be improved through the orderly access of a certain scale of distributed photovoltaic. Therefore, it is necessary to study the optimal configuration of distributed photovoltaics in the distribution network from the perspective of three-phase imbalance in ...

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Application Information

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IPC IPC(8): H02J3/46H02J3/26
CPCH02J3/466H02J3/26H02J2203/20H02J2300/22Y02E40/50
Inventor 姜磊王坤芳苗春雨张勇史梓男贡晓旭蔡秀仪
Owner STATE GRID CORP OF CHINA
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