期刊
IEEE TRANSACTIONS ON SUSTAINABLE ENERGY
卷 13, 期 3, 页码 1594-1606出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSTE.2022.3167106
关键词
Impedance; Analytical models; HVDC transmission; Rectifiers; Transformers; Power system stability; Phase locked loops; Analytical modeling; commutation overlap; LCC-HVDC; mapping function; sending AC grid; stability analysis
资金
- National Natural Science Foundation of China [51977194, TSTE-01299-2021]
This paper investigates the stability issues of sending AC grid in the context of doubly fed induction generator (DFIG)-based wind power generation and high-voltage direct-current (HVDC) transmission. The focus is on the commutation characteristics of line-commutated converter (LCC)-based HVDC rectifier due to the nonnegligible leakage inductance of transformers. By proposing spectral models and establishing an analytical model considering the commutation overlap angle, the impact of commutation overlap on the impedance model of LCC-HVDC is studied. The results show that commutation overlap cannot be ignored and the simplified modeling methods in different frequency bands are discussed.
In recent years, the doubly fed induction generator (DFIG)-based wind power generation and high-voltage direct-current (HVDC) transmission are widely utilized in practice. The stability issues of sending AC grid, which is composed of line-commutated converter (LCC)-based HVDC and DFIG system, is worthy of attention. Commutation is an important factor in the impedance model of LCC-HVDC rectifier, due to the nonnegligible leakage inductance of transformer. However, it was overlooked in previous studies because there are many difficulties in modeling commutation overlap characteristic. In this paper, the spectral models of voltage and current mapping functions are proposed by 3-D Fourier series method, in which the commutation overlap angle is considered. Then, based on the concept of harmonic linearization, an analytical model that describes the commutation process is established and validated by simulations. The mechanism that the commutation overlap characteristic affects the impedance model of LCC-HVDC is investigated, and the simplified modeling method in different frequency bands is studied. The stability of sending AC grid is analyzed applying the Generalized Nyquist Criterion (GNC). The results of stability analysis show that the effect of commutation overlap cannot be ignored. The simulation results confirm the correctness of the obtained conclusion.
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