Energy storage configuration optimization method for normal and fault voltage fluctuation suppression of photovoltaic access power grid

Abstract

The invention discloses an energy storage configuration optimization method for normal and fault voltage fluctuation suppression of a photovoltaic access power grid. The method comprises the following steps: S1, analyzing voltage distribution of a power grid containing photovoltaic and energy storage; s2, establishing an energy storage site selection optimization model taking voltage regulation as a target; and S3, solving the model in the step S2 by adopting a generalized simple gradient algorithm, and determining the optimal position and capacity of the energy storage access power grid. According to the method, the optimal position and capacity of energy storage access are determined by establishing the power grid energy storage site selection optimization model with voltage regulation as the target, the node voltage level of the power distribution network power system is improved, and the emergency power supporting capacity of the power distribution network power system in the fault state is improved.

Description

technical field [0001] The invention belongs to the technical field of electric power regulation, and in particular relates to an energy storage configuration optimization method oriented to normal photovoltaic grid access and suppression of fault voltage fluctuations. Background technique [0002] Due to the strong randomness and volatility of renewable energy such as wind power and photovoltaics, when large-scale renewable energy is connected to the power system, the system node voltage fluctuations are relatively severe, which seriously affects the power loss and power quality of the power system. Therefore, it is very important to study the voltage problem of renewable energy accessing regional power grids. [0003] Electrochemical energy storage technology is developing rapidly, and the maturity and technical economy of battery energy storage technology are constantly improving. The introduction of energy storage systems in the power system can effectively improve the ...

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Problems solved by technology

[0004]In the prior art, some researchers adjust the voltage by changing the tap of the transformer, but the number of on-load tap changer transformers in the system is limited, and The adjustment speed is slow, so the overall effect is average; some researchers take the minimum active network loss as the optimization goal, and use the principle of cone relaxation to construct a reactive power optimization model of the distribution network with distributed energy, which ensures the new energy consumption. While ensuring the minimum network loss of the distribution network; some researchers have proposed to explore the use of reducing the output of photovoltaic power sources to improve the voltage limit when the voltage of the grid node exceeds the limit, but the suspension of photovoltaic power generation is not conducive to the maximum utilization of solar energy

Therefore, at present, for the problem of node voltage over-limit caused by the increase in the penetration rate of new energy generation technologies such as wind power and photovoltaics, many adjustments are made from the perspective of traditional reactive power compensation devices and energy storage output, and few considerations are made. Optimizing the installation location and capacity of the energy storage system for voltage regulation

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