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VSG-based adaptive droop control for Frequency and Active Power Regulation in the MTDC System

CSEE Journal of Power and Energy Systems 2017年第3期3卷 260-268页

作者： Ren Wang Laijun Chen Tianwen Zheng Shengwei Mei Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

In this paper,a VSG(virtual synchronous generator)-based method with adaptive active power and DC voltage droop is proposed for the control of VSC stations in the multi-terminal DC(MTDC)*** control strategy can improve the inertial level of the AC networks and attenuate the rate of change of frequency when a disturbance *** addition,the droop control of the active power and DC voltage is implemented to make the AC networks share the unbalanced power in the *** droop coefficients are adaptively adjusted depending on the frequency margin of every AC network,which makes the allocation of unbalanced power among AC networks more reasonable from the frequency variation *** control strategy is evaluated in the scenarios of sudden load change and wind turbine tripping,and the results are presented to demonstrate its effectiveness.

关键词： adaptive droop control frequency regulation MTDC unbalanced power allocation virtual inertial

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A novel control strategy based on a look-up table for optimal operation of MTDC systems in post-contingency conditions

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Protection and control of Modern Power Systems 2022年第1期7卷 40-50页

作者： Seyed Mohsen Alavi Reza Ghazi Department of Electrical Engineering Ferdowsi University of MashhadMashhadIran

Multi terminal VSC-HVDC systems are a promising solution to the problem of connecting offshore wind farms to AC *** power sharing and appropriate control of DC-link voltages are essential and must be maintained dur-ing the operation of VSC-MTDC systems,particularly in post-contingency *** traditional droop control methods cannot satisfy these requirements,and accordingly,this paper proposes a novel centralized control strategy based on a look-up table to ensure optimal power sharing and minimum DC voltage deviation immediately during post-contingency conditions by considering converter *** also reduces destructive effects(e.g.,frequency devia-tion)on onshore AC grids and guarantees the stable operation of the entire MTDC *** proposed look-up table is an array of data that relates operating conditions to optimal droop coefficients and is determined according to N-1 contingency analysis and a linearized system *** constraints and contingencies such as wind power changes,converter outage,and DC line disconnection are considered in its formation *** performed on a 4-terminal VSC-MTDC system in the MATLAB-Simulink environment validate the effectiveness and superiority of the proposed control strategy.

关键词： Optimal power sharing DC voltage deviation adaptive droop control Multi-terminal HVDC(MTDC) Voltage source converter(VSC)

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