Analysis on Dynamic Response of LCC-VSC Hybrid HVDC System with AC/DC Faults

Yu, Xiang; Yi, Jianbo; Wang, Ni; Teng, Yufei; Huang, Qi

doi:10.1109/isgt-asia.2018.8467907

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…Start and shut down the converter the AC side voltage for all the three phases during dynamic conditions of VSC-HVDC system. The expression related to the same is given as (4), ( 5), (6), and ( 7) [31].…”

Section: Set Of Operation and Control Modesmentioning

confidence: 99%

Dynamic Analysis of VSC-HVDC System with Disturbances in the Adjacent AC Networks

Tiwari

Kumar

Gupta

et al. 2023

DGAEJ

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VSC-HVDC systems are widely used to integrate wind farms, asynchronous generations and networks operating at different frequencies. The Multi-terminal (MT) and multi-fed (MF) HVDC’s are the system mainly constituted of VSC’s, to integrate renewable sources and transmitting bulk power to conventional AC grids. A sudden change in the steady state even in adjacent networks may create severe disturbances in the operation of such HVDC systems. The disturbances in AC or DC networks directly influence the performance of systems, particularly in MT-HVDC and MF-HVDC systems. However, the HVDC systems are known for their intelligent control in modulating operational states as and when required. This paper presents the dynamic analysis of MF-HVDC system due to load changes, faults and other disturbances in the adjacent AC networks. The result indicates that VSC-HVDC provides decoupled control of active and reactive power with capability in adjusting operational mode during various minor and major disturbances. Based on the results obtained, the paper proposed a novel sensitivity factor indicating percentage coupling among various line parameters during disturbances. Furthermore, the VSC’s injects harmonic signals on both AC and DC sides of HVDC system. These harmonics voltage or currents signals may get amplified to a dangerously high magnitude at resonance frequencies. Thus, the frequency characteristics of different subsystems are also analyzed using FFT. A ±100 kV, 200 MW bipolar MF VSC-HVDC test systems is used to simulated the results in MATLAB/Simulink software.

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Section: Set Of Operation and Control Modesmentioning

confidence: 99%

Dynamic Analysis of VSC-HVDC System with Disturbances in the Adjacent AC Networks

Tiwari

Kumar

Gupta

et al. 2023

DGAEJ

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“…When the DC voltage of LCC drops to a certain threshold, the DC current will be controlled to be reduced. The reduced DC current helps to improve DC voltage recovery and AC system stability as the absorbed reactive power is reduced [19].…”

Section: Control Principlementioning

confidence: 99%

Hybrid AC/DC hub for integrating onshore wind power and interconnecting onshore and offshore DC networks

Huang

Xiang

et al. 2020

IET Renewable Power Generation

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A hybrid AC/DC hub is proposed in this study, where a modular multilevel converter and a line-commutated converter are paralleled at the AC side to integrate onshore wind power, and connected in series at the DC sides to interconnect two DC networks with different voltages. The hybrid AC/DC hub facilitates wind power integration and DC network interconnection with reduced converter ratings and power losses when compared with the 'conventional' approach using DC-DC converters. To investigate the design requirement and performance of the hybrid AC/DC hub, power flow analysis is assessed to evaluate the converter power rating requirement. To ride through DC faults at either side of the interconnected DC networks, a coordinated DC fault protection for the hybrid AC/DC hub is proposed and studied. Simulation results in PSCAD/EMTDC verify the feasibility and effectiveness of the proposed control and protection of the hybrid AC/DC hub under power flow change, AC and DC fault conditions.

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“…where R 1 and R 2 represent line resistance and rectifier resistance; L 1 and L 2 represent the line inductances; C 1 represents the line capacitance; and C 2 represents the inverter capacitance. The transfer function of the HVDC system can be obtained using (14).…”

Section: Characteristics Of Overvoltage Fixed Trigger Angle Control Smentioning

confidence: 99%

“…In a previous study [13], the response characteristics were analyzed when a fault occurred at the receiving-end AC system, but only basic strategies were used, and no improvements have been made. In [14], the structures and operation principle of LCC-VSC technology were introduced, and the dynamic response was compared between LCC-VSC technology and LCC technology on the same failure conditions. LCC-VSC technology can better stabilize the frequency and voltage of the AC system.…”

mentioning

confidence: 99%

AC fault ride through control strategy on inverter side of hybrid HVDC transmission systems

Zhou

Chen

Wang

et al. 2019

J. Mod. Power Syst. Clean Energy

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Hybrid high-voltage direct current (HVDC) transmission systems employ a new type of HVDC transmission topology that combines the advantages of the linecommutated converter system and the voltage-source converter system. They can improve the efficiency and reliability of long-distance power transmission. However, realizing alternating-current (AC) grid-fault ride through on the inverter side of a hybrid HVDC transmission system is a challenge considering that a voltage-source converter based HVDC (VSC-HVDC) is used on the inverter side. In this study, a control strategy for an overvoltage fixed trigger angle based on the power-balance method is developed by fully utilizing the operation characteristics of a hybrid HVDC transmission system. The strategy reduces the inverter-side overvoltage of the HVDC system under a fault in the inverter-side AC system. Simulations based on Gezhou Dam are conducted to validate the effectiveness of the proposed strategy.

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Analysis on Dynamic Response of LCC-VSC Hybrid HVDC System with AC/DC Faults

Cited by 5 publications

References 9 publications

Dynamic Analysis of VSC-HVDC System with Disturbances in the Adjacent AC Networks

Dynamic Analysis of VSC-HVDC System with Disturbances in the Adjacent AC Networks

Hybrid AC/DC hub for integrating onshore wind power and interconnecting onshore and offshore DC networks

AC fault ride through control strategy on inverter side of hybrid HVDC transmission systems

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