Transient Characteristics of Offshore Wind Power Sending System via Flexible HVDC Transmission System Under DC Line Breakage Fault

doi:10.12204/j.issn.1000-7229.2021.04.011

Abstract

Abstract:

DC transmission line breakage fault is one of the common types of DC faults, so research on the transient response characteristics of offshore wind power sending systems via flexible high voltage direct current (HVDC) transmission system in this scenario has important value for the protection scheme design. At first, the mechanism of short-circuit current under line breakage fault at the positive pole of the DC bus is analyzed in this paper. Furthermore, the expression of short-circuit current at the non-fault pole is derived, and the impact of ground-impedance on the characteristics of short-circuit current is considered. Secondly, the transient voltage evolution characteristics during the fault on the AC and DC sides of the converter station on the wind farm side and the grid side are studied. Results show that the DC voltage on the wind farm side is positively correlated with its active power output during the fault, and the AC-side voltage of the converter stations produce a pair of DC bias components of equal magnitude and opposite directions. In addition, it can effectively reduce the impact of short-circuit current on system operation performance if a larger ground-impedance is adopted. Finally, the electromagnetic transient model of the whole system is built on the PSCAD/EMTDC simulation platform, and the correctness of the analysis on transient characteristics and the rationality of parameter selection are verified by simulations. The work in this paper has certain guiding significance for the planning and design of large-scale offshore wind power integration with flexible HVDC transmission system.

Key words: DC line breakage fault, offshore wind power, flexible HVDC transmission system, short-circuit current, transient characteristic

CLC Number:

TM713

HUANG Ruanming, CHI Yongning, WANG Jun, ZHANG Mengyao, GUO Mingxing, LI Yan, YAO Jun. Transient Characteristics of Offshore Wind Power Sending System via Flexible HVDC Transmission System Under DC Line Breakage Fault[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(4): 97-104.

Figures/Tables 6

Fig.1 Structure of offshore wind power sending system via flexible HVDC transmission system

Fig.2 Topology of an MMC station

Fig.3 Discharge path under DC line breakage fault

Table 1 Simulation parameters of offshore wind power sending system via flexible HVDC transmission system

Fig.4 Transient response characteristics of the system under DC line breakage fault

Fig.5 Characteristics of short-circuit current under different ground-impedance

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