Control and Impedance Modeling of Offshore Wind Power Hybrid Cascaded DC Transmission System Based on of VSC and DRU

doi:10.12204/j.issn.1000-7229.2022.04.005

Abstract

Abstract:

Offshore wind power integration system applying hybrid cascaded DC transmission has the advantages of high voltage, large capacity and low investment cost, but its stability has gained many concerns. And the system impedance modeling is the basis for analyzing stability. In this paper, a detailed mathematical model of VSC-DRU hybrid cascaded valve station is established. In order to realize active power distribution and AC voltage control of the DC transmission system, the power-voltage control strategy of VSC with filter capacitor current feedback is studied. Considering the influence of output phase-angle adjustment of phase-locked loop, active damping control and power control, the detailed impedance model of VSC-DRU hybrid cascaded valve station is derived and analyzed by using small-signal disturbance method, which provides a basis for studying stability. Finally, the simulation results in PSCAD/EMTDC show that the proposed control has good performance of power-voltage regulation. And the correctness of the established detailed impedance model is verified by the frequency-scanning method.

Key words: VSC-DRU hybrid valve, HVDC transmission system, power-voltage regulation control, small signal disturbance, impedance modeling

CLC Number:

TM712

WANG Shichao, SUN Shida, HAO Weihan, ZHANG Ganghua, XIANG Wang, HUANG Yang, OU Xiaoliang. Control and Impedance Modeling of Offshore Wind Power Hybrid Cascaded DC Transmission System Based on of VSC and DRU[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(4): 38-48.

Figures/Tables 11

Fig.1 Topology of offshore wind power hybrid cascade DC transmission system based on of VSC and DRU

Fig.2 DRU conduction model from D5-D6 to D6-D1

Fig.3 Control strategy of VSC converter

Fig.4 d-q rotation axis of system and controller

Fig.5 Closed-loop small-signal model of VSC converter

Table 1 Simulation parameters of the system

Fig.6 Voltage and power waveforms of hybrid cascaded DC transmission system

Fig.7 Schematic diagram of impedance measurement of VSC-DRU hybrid cascade station

Fig.8 Comparison and validation for VSC converter closed-loop impedance model

Fig.9 Validation for DRU impedance model with passive filter

Fig.10 Validation for impedance model of VSC-DRU Hybrid Cascade Converter Station

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