SISO model establishment method suitable for multi-machine interaction characteristic analysis

By establishing a SISO model suitable for multi-computer interaction characteristic analysis, the frequency response dynamics of the converter under grid frequency disturbance is described, the problem of difficulty in multi-computer interaction characteristic analysis in the prior art is solved, and an in-depth analysis of the synchronous stability mechanism of hybrid systems is realized.

CN119691978AActive Publication Date: 2025-03-25STATE GRID HUBEI ELECTRIC POWER RES INST +1
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Patent Information

Application Number
CN202411620138.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-13
Publication Date
2025-03-25
Estimated Expiration
2044-11-13

AI Technical Summary

Technical Problem

The prior art is difficult to effectively analyze the interaction characteristics of multiple machines, especially the dynamic behavior of the converter under the frequency disturbance of the power grid, resulting in the synchronization stability problem of hybrid systems not being fully studied.

Method used

A SISO model establishment method suitable for multi-computer interaction characteristics analysis is proposed. By establishing a SISO model of a single mesh-type and mesh-type converter and coupling it to the same steady-state coordinate system, a dynamic interaction model of a parallel mesh-type and mesh-type converter is formed, and the frequency response dynamics of the converter are described using the grid frequency disturbance as the input variable.

Benefits of technology

This model solves the problem of difficulty in MIMO system analysis, converts the parallel converter into an interactive SISO system, simplifies the loop shaping of PLL and power synchronization loops, and clarifies the support effect of GFM access at different capacity and locations on GFL frequency and voltage, as well as the impact of GFL access on GFM stability.

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Abstract

The invention discloses an SISO model establishment method suitable for multi-machine interaction characteristic analysis. The SISO model establishment method comprises the steps of establishing an SISO model of a single grid-following type converter connected to a power grid; establishing an SISO model for accessing a single network-forming converter to a power grid; and step 3, coupling the obtained single-machine SISO model to the same steady-state coordinate system through matrix transformation, and further establishing a dynamic interaction model of a parallel-connection network-following type converter and a network-constructing type converter, namely obtaining the SISO model suitable for multi-machine interaction characteristic analysis. According to the constructed model, power grid frequency disturbance serves as an input variable, the frequency response dynamic state of the converters is completely described, the problem that a multi-input-multi-output system is difficult to analyze is solved, the two converters connected in parallel are finally converted into two mutually-acting SISO systems, a synchronization link only appears once in an open-loop transfer function of the system, and the synchronization efficiency is greatly improved. And loop shaping of the phase-locked loop and the power synchronization loop is facilitated.
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