STABILITY ASYMMETRIC PHENOMENA AND CHARACTERISTIC ANALYSIS OF GRID-CONNECTED INVERTER IN d-q SYNCHRONOUS ROTATING REFERENCE FRAME

Hao Mukai; Wang Weisheng; Liu Fang; Yuan Gengtao; Li Xuexian

doi:10.19912/j.0254-0096.tynxb.2024-0546

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (8) : 612-624. DOI: 10.19912/j.0254-0096.tynxb.2024-0546

STABILITY ASYMMETRIC PHENOMENA AND CHARACTERISTIC ANALYSIS OF GRID-CONNECTED INVERTER IN d-q SYNCHRONOUS ROTATING REFERENCE FRAME

Hao Mukai^1,2, Wang Weisheng³, Liu Fang⁴, Yuan Gengtao⁴, Li Xuexian⁴

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Abstract

Onder the weak cuvrent network, grid-cornnected inverters need both altive and power to support operation simultaneously. so its operating characteristic and stability issue under different power factors are particularly important. Therefore, from the perspective of system damping ratio, the small signal models of grid-connected inverter under three control methods are respectively constructed： current loop vector control based on phase-locked loop （PLL）, voltage and current double loop vector control and virtual synchronous generator （VSG） control under d-q synchronous rotating reference frame. It is found that when the current vector is a circular trajectory, its damping ratio characteristic is a non-circular trajectory. It means d-q axis present different stability feature, namely stability ‘asymmetry’ phenomenon; Based on that, it is found that the integral term, PLL and VSG angle under the three control methods have the greatest impact on the symmetry of the power stability. Besides, when power factor changes from -90°~0°~90°, the participation factor of the PLL angle increases first and then decreases, and vice versa for VSG angle. In addition, the oscillation modes related to the ‘asymmetrical’ characteristics is more under the double-loop vector control strategy and the participation of the two integral links of the current loop d and q axes on the same oscillation mode is quite different; the range of instability is wider and the phenomenon of ‘asymmetry’ is more obvious. Finally, the accuracy of the analysis is verified by Matlab simulation and experimental platform.

Key words

damping ratio / grid-connected inverter / d-q axis asymmetric self-synchronization / weak grid / voltage and current dual-loop vector control / participation factor

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Hao Mukai, Wang Weisheng, Liu Fang, Yuan Gengtao, Li Xuexian. STABILITY ASYMMETRIC PHENOMENA AND CHARACTERISTIC ANALYSIS OF GRID-CONNECTED INVERTER IN d-q SYNCHRONOUS ROTATING REFERENCE FRAME[J]. Acta Energiae Solaris Sinica. 2025, 46(8): 612-624 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0546

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