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

A technology that connects to the power grid and fault voltage is applied in the direction of AC network voltage adjustment, circuit devices, electrical components, etc., and can solve problems such as reducing photovoltaic power supply output to improve voltage limit, node voltage limit, and maximum utilization of photovoltaic unfavorable light energy. , to achieve the effect of improving node voltage level, improving voltage quality, and improving emergency power support capability

CN114498740AActive Publication Date: 2022-05-13STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-05-13

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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.
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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 ...

Examples

Embodiment

[0088] An energy storage allocation optimization method for normal and fault voltage fluctuation suppression of photovoltaic grid connection, comprising the following steps:

[0089] Step S1, analyze the voltage distribution of the power grid including photovoltaic and energy storage, the specific method is as follows:

[0090] (1) Analyze the characteristics of energy storage and photovoltaic operation by establishing a photovoltaic-energy storage grid-connected power generation system model; the photovoltaic-energy storage grid-connected power generation system model, such as figure 1 As shown, it mainly includes a photovoltaic array, a unidirectional converter, a grid-connected inverter, a battery energy storage system and a bidirectional converter; the photovoltaic array and the unidirectional converter are connected with the battery energy storage system and the bidirectional converter The grid-connected inverter described above is connected in parallel, the photovoltaic ...