Power grid equivalent inertia simulation method and device

By establishing a frequency response model for the power grid to be connected to the power grid and calculating the reference parameters of the power grid simulation device, the problem that the existing technology cannot verify the interactive characteristics of the new energy units and the power grid under different equivalent inertia levels of the power grid is solved, and a more comprehensive test and verification of new energy power grids is achieved.

CN119891273AActive Publication Date: 2025-04-25CHINA ELECTRIC POWER RESEARCH INSTITUTE CO LTD
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Patent Information

Application Number
CN202510387155.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-31
Publication Date
2025-04-25
Estimated Expiration
2045-03-31

AI Technical Summary

Technical Problem

The existing technology cannot verify the interactive characteristics of new energy units and the power grid at different equivalent inertia levels of the power grid, resulting in huge challenges in the safe and stable operation of the system.

Method used

By determining the proportion coefficient and frequency response power of thermal power units, hydropower units and new energy power generation equipment in the power grid, establishing a frequency response model for the power grid connection of new energy power generation equipment, and then calculating the reference angular frequency unit and reference voltage of the power grid simulation device, generating modulation voltage commands to control the switching signal of the inverter link, and simulating grid scenarios with different equivalent inertia levels.

Benefits of technology

It has realized the interactive characteristics verification of new energy power generation equipment under different equivalent inertia power grids, provided richer testing conditions, met the testing needs of new energy distributed and centralized delivery systems, and improved the testing and verification capabilities of new energy technology.

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Abstract

The invention discloses a power grid equivalent inertia simulation method and device, and belongs to the technical field of new energy grid connection. In order to solve the problem that an existing power grid simulation device cannot verify interaction characteristics of a new energy unit and a power grid under different equivalent inertia levels, a frequency response model considering frequency response characteristics of a thermal power generating unit, a hydroelectric generating unit and new energy power generation equipment is established, and power grid equivalent inertia simulation is achieved through the power grid simulation device. The method comprises the following steps: determining each power supply proportion coefficient and frequency response power, and constructing a frequency response model; calculating active power and reactive power of new energy based on the actually measured voltage and current; deriving a reference angular frequency per unit value in combination with a frequency response model and active power, and determining a reference voltage through reactive power; a modulation instruction is generated through voltage and current double-closed-loop control, and an inversion link is driven to simulate the dynamic characteristics of a power grid. According to the invention, power grid scenes with different inertia levels can be simulated, and the network source interaction adaptability of the new energy unit in a complex power grid environment can be verified.
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Citation Information

Patent Citations

  • Robust collaborative frequency modulation method considering energy storage charge state and adaptive inertia level

    CN115296308A

  • Frequency index rapid analysis method and system based on new energy power system

    CN117972272A

  • New energy station equivalent inertia dynamic simulation method based on grid-connected converter control

    CN117977692A

  • Network construction type photovoltaic parameter optimization method, device and equipment and storage medium

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  • Direct-driven wind turbine networking control method, equivalent inertia analysis method and system and storage medium

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