Research on the Linearization Relationship of Small Disturbances in Converter Interfaced AC Power Systems Based on Operating Points of Internal-voltage Amplitude/Frequency and Active/Reactive Current

Oscillation problems with unknown mechanisms often occur in today's power systems, resulting in serious consequences such as equipment damage or even off-grid. However, existing methods are difficult to adapt to new forms of system analysis and have certain limitations. In this paper, starting...

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Bibliographic Details
Published in2024 IEEE 7th International Electrical and Energy Conference (CIEEC) pp. 1339 - 1344
Main Authors Yang, Haitong, Yuan, Xiaoming
Format Conference Proceeding
LanguageEnglish
Published IEEE 10.05.2024
Subjects
AC signal systemt
Frequency conversion
Frequency estimation
linearization relationship
operating points
Perturbation methods
Power system dynamics
Power system stability
small disturbance
Stability analysis
Voltage
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Summary:Oscillation problems with unknown mechanisms often occur in today's power systems, resulting in serious consequences such as equipment damage or even off-grid. However, existing methods are difficult to adapt to new forms of system analysis and have certain limitations. In this paper, starting from the understanding of the objective dynamic process of AC power system, and taking the converter grid-connected AC system as an example, firstly, the basic operation principle of the power system is elaborated, and the internal voltage amplitude/ frequency and active/reactive current operating points of the AC power system and their energy connotations are clarified, and then based on that, the internal voltage amplitude/frequency and active/reactive current small perturbation relationship of the converter grid-connected AC system and its linearization method are proposed, and finally the influence of the system structural control parameters on the stability of the system is explored and analyzed. The method proposed in this paper reveals the root cause of the oscillation phenomenon from the physical mechanism, which can provide a theoretical basis for the subsequent oscillation suppression.
DOI:10.1109/CIEEC60922.2024.10583710