Resonance Analysis and Suppression in Jiangsu Rudong Offshore Wind Power Flexible DC System

doi:10.12204/j.issn.1000-7229.2023.06.015

Abstract

Abstract:

In October 2021, during a no-load unlocking test on an offshore converter station with single- and double-connected transformers, an AC system voltage resonance of 2500 Hz or 2000 Hz was detected at the Rudong Offshore Wind Power Flexible Direct Project. This paper provides a detailed analysis of the impedance of flexible DC and AC systems and their interaction characteristics. The simulation results confirmed that the system was at risk of resonance in this frequency band, and the resonance mechanism was revealed. To address this resonance issue, an active resonance suppression method based on proportional resonance control of the voltage feedforward link was proposed in this study, which can significantly reduce the high-frequency negative damping of flexible straight systems. Simultaneously, a passive resonance suppression method based on a correction device for amplitude and phase angle was also proposed to improve the full-band impedance characteristics of the flexible direct system and the feeding system. The simulation results obtained using the Rudong engineering parameters show that this method can suppress system resonance in the full frequency band and is expected to completely solve the resonance problem of the follow-up flexible DC system. Thus, the simulation results and on-site implementation of the Rudong project proved the effectiveness of the method.

Key words: offshore wind power, flexible DC transmission, impedance analysis, resonance suppression, correction device for amplitude and phase angle

CLC Number:

TM721.1

ZHAO Zheng, LI Ming, TIAN Yuanyuan, HUANG Caowei, XIONG Lingfei, ZHU Mingxi. Resonance Analysis and Suppression in Jiangsu Rudong Offshore Wind Power Flexible DC System[J]. ELECTRIC POWER CONSTRUCTION, 2023, 44(6): 144-152.

Figures/Tables 15

Fig.1 Overview of Rudong offshore wind power flexible direct project

Fig.2 2 500 Hz high-frequency resonance of the no-load unlocking test of the offshore converter station with single connected transformer

Fig.3 2 000 Hz high-frequency resonance of the no-load unlocking test of the offshore converter station with double connected transformers

Fig.4 Equivalent control block diagram of flexible DC system

Table 1 Key parameters of flexible DC system of Rudong Project

Fig.5 Theoretical calculation value of impedance of flexible DC system

Table 2 Capacitance parameters of some equipment in Rudong project pF

Fig.6 Impedance interaction characteristics between ZMMC and ZT

Fig.7 Comparison of impedance interaction characteristics before and after superposing PR control with single no-load connected transformer

Fig.8 Comparison of impedance interaction characteristics before and after superposing PR control with double no-load connected transformers

Fig.9 Waveform diagram after taking resonance suppression method based on the proportional resonance control of the voltage feedforward link

Fig.10 Typical topology of MMC amplitude and phase correctors

Table 3 Typical design parameters of MMC amplitude and phase corrector in Scheme Three

Fig.11 Impedance characteristics of MMC amplitude and phase correctors under typical design parameters

Fig.12 Equivalent impedance characteristics of AC bus at the connection of offshore converter station to transformer network side

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