Optimization configuration and operation method for DES in photovoltaic generation based LVDN

Abstract

The invention discloses an optimization configuration and operation method for DES (Distributed Energy Storage) in a photovoltaic generation based LVDN (Low Voltage Distribution Network). The method includes determining the total rated power of the DES and the total rated electric quantity of DES required by the whole LVDN; constructing a DES optimization configuration and operation model; solvingthe DES optimization configuration and operation model and acquiring the optimization configuration and operation scheme for the DES in the LVDN. According to the invention, the total rated power andthe total rated electric quantity of the DES required by the whole LVDN are determined according to requirements for node voltage allowing offset and the optimization model taking the optimal superior power grid load rate as the target and taking into account a support effect for the LVDN voltage by voltage inactive control features of the DES and limitation of the number of mounting points of the DES in the LVDN is constructed. The optimization results indicates that the optimization model can make optimization decisions on the mounting position, the rated power, the rated electric quantityand the charge / discharge state and power in different time periods of the DES at the same time; the superior power grid load rate is optimized and the active power of the power grid is reduced in a specific degree at the same time.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a distributed energy storage optimization configuration and operation method of a photovoltaic-containing low-voltage distribution network. Background technique [0002] At present, my country's low-voltage distribution network (LVDN for short) mainly operates in a radial network structure. Due to the long distribution lines, various types of loads and fast growth, it is easy to cause large losses in distribution lines and voltage at the end of feeders. Problems such as low load and large load fluctuation of the upper power grid. With the change of my country's energy structure and the improvement of environmental protection requirements, the penetration rate of distributed photovoltaics in LVDN continues to increase, and its output is subject to large random fluctuations due to the influence of light intensity and temperature, which makes the operating state of the distri...

AI Technical Summary

Problems solved by technology

However, at present, DES is relatively expensive in terms of manufacturing, operation and maintenance. How to realize the optimal configuration and operation of DES in LVDN requires an urgent solution

[0003] At present, the existing research on the optimal configuration and operation of DES usually only optimizes one aspect of the energy storage installation location, rated power, rated power, charging and discharging status, and power, while other aspects of information are given in advance. fixed

In addition, the existing optimization models usually take the minimum active power loss of the power grid and the maximum economic benefits of DES configuration and operation as the objective functions to solve, and rarely consider the influence of the voltage and reactive power control characteristics of DES on LVDN voltage

[0004] The disadvantages of the above technologies are: the existing research on the optimal configuration and operation of DES rarely considers the optimization of the installation location, rated power, rated power, charge and discharge status, and power of energy storage at the same time, and only studies the optimal configuration or optimization. One aspect of the operation problem, while information on other aspects is given in advance, the result has a certain degree of subjectivity

At the same time, the existing research rarely considers the supporting effect of the voltage and reactive power control characteristics of DES on LVDN voltage, and rarely considers the limitation of the number of installation points of DES in LVDN, and the optimization results are far from the actual engineering requirements.

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