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Abstract

Different from the synchronization mechanism of synchronous generators, the non-synchronous generators must be synchronized with the grid through a controller. Generally, the virtual synchronous generator (VSG) control strategy is adopted for this purpose. In view of the current situation, where the control loops are not comprehensively considered in the research of the synchronization stability of the VSG, this paper considers multiple control loops, such as active frequency loops, virtual governors, power filters and current constraint control, to establish the mathematical model of the VSG and infinite system. On this basis, the correlation formula between power angle difference and control parameters is deduced. Adopting the phase plane method, the influence of different control loops and their parameters on the transient synchronization stability is analyzed. Finally, a setting principle of the frequency modulation coefficient of virtual governors is proposed, which not only meets the response speed of control systems, but also has good control performance.
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Authors and Affiliations

Yanxia Zhang
1
Yachao Cheng
1
Kaixiang Liu
Yue Han
1

  1. School of Electrical and Information Engineering, Tianjin University, China
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Abstract

Accurate and reliable fault location is necessary for ensuring the safe and reliable operation of the VSC-HVDC transmission system. This paper proposed a single-terminal fault location method based on the fault transient characteristics of the two-terminal VSCHVDC transmission system. The pole-to-pole transient fault process was divided into three stages, the time-domain expression of the DC current during the diode freewheel stage was used to locate the fault point, and a criterion for judging whether the fault evolves to the diode freewheel stage was proposed. Taking into account the enhancing effect of the opposite system to the fault current, theDCside pole-to-ground fault networkwas equated to a fourth-order circuit model, the relationship of fault distance with the characteristic roots of fault current differential equationwas derived, and the Prony algorithmwas utilized for datafitting to extract characteristic roots to realize fault location. A two-terminal VSC-HVDC transmission system was modelled in PSCAD/EMTDC. The simulation result verifies that the proposed principle can accurately locate the fault point on the VSC-HVDC transmission lines.
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Bibliography

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[2] Li C., Li Y., Guo J., Research on emergency DC power support coordinated control for hybrid multiinfeed HVDC system, Archives of Electrical Engineering, vol. 69, no. 1, pp. 5–21 (2020).
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[7] Li D., Ukil A., Satpathi K., Improved S Transform Based Fault Detection Method in VSC Interfaced DC System, IEEE Transactions on Industrial Electronics, vol. 68, iss. 6, pp. 5024–5035 (2020), DOI: 10.1109/TIE.2020.2988193.
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[13] Zhang Y., Wang H., Li T., Combined single-end fault location method for LCC-VSC hybrid HVDC transmission lines, Automation of Electric Power Systems, vol. 43, no. 21, pp. 187–199 (2019).
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[15] Yanxia Z., JianW., Huilan J., Fang Z., A Novel Fault Location Method for Hybrid-HVDC Transmission Line, 2019 IEEE Power and Energy Society General Meeting (PESGM), Atlanta, GA, USA, pp. 1–5 (2019).
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Authors and Affiliations

Yanxia Zhang
1
Anlu Bi
1
Jian Wang
1
Fuhe Zhang
1
Jingyi Lu
1

  1. School of Electrical and Information Engineering, Tianjin University, China
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Abstract

Commutation reactance is an important component in the voltage-source converter- based high-voltage direct current (VSC–HVDC) transmission system. Due to its connection to the converter, when there is a fault occurring on the valve-side bushing of a converter transformer, the nonlinearity operation of the converter complicates the characteristics of current flowing through commutation reactance, which may lead to maloperation of its overcurrent protection. It is of great significance to study the performance of commutation reactance overcurrent protection under this fault condition and propose corresponding improvement measures to ensure the safe and stable operation of AC and DC systems. In the VSC–HVDC system with the pseudo-bipolar structure of a three-phase two-level voltage source converter, the valve has six working periods in a power frequency cycle, and each period is divided into five working states. According to the difference between the fault phase and non-fault phase of the conductive bridge arms at the time of fault occurrence, these five working states are merged into two categories. On this basis, various faults of the valve-side bushing of a converter transformer are analyzed, and the conclusion is drawn that the asymmetric fault of valve-side bushing can lead to the maloperation of the commutation reactance overcurrent protection. Based on the characteristics that the current flowing through the commutation reactance after the asymmetric fault of the valve-side bushing contains decaying aperiodic components in addition to the fundamental frequency wave, a scheme to prevent the maloperation of commutation reactance overcurrent protection is proposed, which uses the unequal of two half cycle integral values with different starting points to realize the blocking of commutation reactance overcurrent protection, and it makes up the deficiency of existing protection in this aspect. Finally, this paper builds a VSC–HVDC system simulation model in the PSCAD/EMTDC platform to verify the effectiveness of the scheme.
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Authors and Affiliations

Yanxia Zhang
1
Guanghao Dong
1
ORCID: ORCID
Le Wei
1
Jinting Ma
1
Shanshan Du
1

  1. School of Electrical and Information Engineering, Tianjin University, No. 92 Weijin Road, Nankai District, Tianjin, China

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