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Abstract
With the development of large-scale new energy, the wind–thermal bundled system transmitted via high-voltage direct current (HVDC) has become the main method to solve the problem of wind power consumption. At the same time, the problem of subsynchronous oscillation among wind power generators, high-voltage direct current (HVDC), and synchronous generators (SGs) has become increasingly prominent. According to the dynamic interaction among doubly fed induction generators (DFIGs), HVDC, and SGs, a linearization model of DFIGs and SGs transmitted via HVDC is established, and the influence of the electromagnetic transient of wind turbines and HVDC on the electromechanical transient processes of SGs is studied. Using the method of additional excitation signal injection, the influence of the main factors of DFIG on the damping characteristics of each torsional mode of SG is analyzed, including control parameters and operation conditions when the capacity of HVDC is fixed. The mechanism of the negative damping torsional of SGs is identified. A time-domain simulation model is built in Electromagnetic Transients including DC/Power Systems Computer Aided Design (EMTDC/PSCAD) to verify the correctness and effectiveness of the theoretical analysis.
Highlights
The results showed that the frequency and damping of the torsional mode increased when the rotor-side converter power outer loop parameter increased from 1 to 5 or the current inner loop control parameter changed from 0.1 to 10; on the other hand, when the wind speed increased from 11 m/s to 15 m/s, the torsional mode first decreased and increased
This paper proposes using the signal injection method to analyze the torsional vibration of a high-proportion wind power system [19], which involves applying an alternating current (AC) voltage signal on the excitation winding to stimulate speed oscillation
doubly fed induction generators (DFIGs) using the principle this paper establishes a single-machine model for DFIGs using the principle of of similar similar transformation, thethe is taken from the first sub-synchronous resonance transformation, while the model is from the sub-synchronous resotransformation,while whilethe themodel modelofof of the is taken taken from the first first sub-synchronous reso(SSR)
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. In wind–thermal bundled systems transmitted via HVDC, the torsional vibration of the SG caused by grid-connected wind turbines is manifested in the rotor speed oscillation. This paper proposes using the signal injection method to analyze the torsional vibration of a high-proportion wind power system [19], which involves applying an alternating current (AC) voltage signal on the excitation winding to stimulate speed oscillation. This paper reveals the interaction mechanism of the system; The influences of DFIG control parameters and operating conditions on the damping characteristics of each torsional mode of SGs under the condition of a fixed capacity of Energies.
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