Energy storage system configuration method considering power grid frequency support demand

A technology of energy storage system and grid frequency, which is applied in the direction of circuit devices, wind power generation, electrical components, etc.

CN112421655AActive Publication Date: 2021-02-26NORTHEAST DIANLI UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-02-26

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Abstract

The invention relates to the technical field of new energy grid connection, particularly to an energy storage system configuration method considering power grid frequency support requirements. The method is characterized by mainly comprising two parts of system maximum power increment solving and energy storage configuration, and comprises the following steps of: solving a maximum power incrementcapable of being borne by a system by taking a frequency change rate and a frequency deviation as limiting conditions; determining the output power and capacity of the energy storage system accordingto the maximum power increment; and finally carrying out virtual inertia configuration on the basis that the energy storage system grid-connected inverter adopts a three-order active support control strategy. According to the invention, the configuration method can flexibly govern the power flow discharge of the energy storage system, and effectively solves the problem of lack of inertia support and frequency modulation capability in the synchronous power grid under high wind power penetration.
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Description

technical field

[0001] The invention relates to the technical field of new energy grid connection, in particular to an energy storage system configuration method considering the frequency support requirements of the grid. Background technique

[0002] With the expansion of power system scale and the increase of wind power penetration rate, power fluctuations caused by factors such as load switching and wind power output fluctuations and uncertainties become more frequent and severe. In addition, power electronic devices separate the rotating equipment of wind turbines from the frequency of the power grid, resulting in a shortage of system inertia and frequency regulation capacity, and the stable operation of the power grid is facing great challenges.

[0003] Compared with the traditional frequency regulation method that reduces the power generation of wind turbines, the energy storage system (ESS) represented by the chemical battery energy storage power station has the char...

Examples

Embodiment Construction

[0065] The following is attached Figure 1-4 The present invention will be further described in detail with the specific embodiments, and the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

[0066] An ESS configuration method considering the frequency response requirements of the power grid, including two parts: the calculation of the maximum power increment of the system and the ESS configuration:

[0067] 1. Calculation of the maximum power increment of the system:

[0068] H is the inertia constant of the synchronous motor, which represents the size of the mechanical inertia of the rotor. If only the inertia of the synchronous unit in the system is considered, then for a power system containing n synchronous units, the equivalent inertia constant H sys for:

[0069]

[0070] Where: H i and S i is the inertia constant and rated capacity of the i-th synchronous machine unit, S sy...