Distribution network distributed energy access limit optimization method

Abstract

The invention relates to a distribution network distributed energy access limit optimization method. The optimization model is as follows: Obj.max.f(x), and thus, an objective function value of an optimization result is equal to a limit capacity for the distribution network distributed energy access, and the optimality of the optimization result can be ensured. The method of the invention has the beneficial effects that the objective function value of the optimization result can be equal to the limit capacity for the distribution network distributed energy access, the optimality of the optimization result can be ensured, in the case of power grid operation, control on interface real power flow by a dispatching department is improved, a certain reliability level is ensured, safety and stability of the power grid are ensured, and the operation is more economic and efficient.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a distribution network distributed energy access limit optimization method. Background technique [0002] With the rapid development of the economy and the gradual improvement of people's living standards, the electricity load is also gradually increasing, and the demand for energy is increasing sharply. Pay attention to. The main characteristics of the current power network power supply mode are large-capacity power grids, large-scale generator sets, and high-voltage levels. The interconnection mode of the centralized power supply grid has obvious disadvantages: (1) security and stability problems, the system is large, the network structure is complex, and it is difficult to control the system in time. When a fault occurs somewhere in the system, it may cause a butterfly chain reaction, which will affect the entire system. The system has serious consequen...

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Problems solved by technology

(3) The problem of economic cost of construction. my country has a vast territory and vast territory, and it is difficult for power supply to cover some remote areas such as the Xinjiang desert area and the Qinghai-Tibet Plateau. Due to the large altitude difference and the distance from the large power grid, the investment cost of building power system transmission lines is high. , serious network loss

(2) Impact on relay protection coordination

When DG is connected to the power grid, the network structure and short-circuit current will change greatly, which will have a certain impact on the coordination of relay protection.

(3) Impact on power quality

However, the evaluation methods of distributed new energy consumption capacity and the measures to improve the access capacity of distributed new energy proposed by existing studies are all based on improving a certain index of the power grid, which is not comprehensive enough.

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