The Applicability of Traditional Protection Methods to Lines Emanating from VSC-HVDC Interconnectors and a Novel Protection Principle

Xue, Shimin; Yang, Jingwen; Chen, Yanxia; Wang, Cunping; Shi, Zhe; Cui, M.; Li, Botong

doi:10.3390/en9060400

Cited by 12 publications

(10 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If there is a fault and the ratio between the actual positive sequence voltage of the AC bus and the rated voltage B ≥ 0.9, the control system will maintain the same control target as that under normal operation. On the contrary, if 0.9 > B > 0.2, the fault ride through control strategy will operate to adjust the magnitude and phase of the output current [27]. In order to provide dynamic reactive power support for the AC system, the converter will work in two quadrants where Q > 0.…”

Section: Control System Of the Ac/dc Hybrid Systemmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Single-Terminal Fault Location Method for AC Transmission Lines in a MMC-HVDC-Based AC/DC Hybrid System

Xue

Liu

et al. 2018

Energies

Self Cite

View full text Add to dashboard Cite

Accurate and reliable fault location method for alternating current (AC) transmission lines is essential to the fault recovery. MMC-based converter brings exclusive non-linear characteristics to AC networks under single-phase-to-ground faults, thus influencing the performance of the fault location method. Fault characteristics are related to the control strategies of the converter. However, the existing fault location methods do not take the control strategies into account, with further study being required to solve this problem. The influence of the control strategies to the fault compound sequence network is analyzed in this paper first. Then, a unique boundary condition that the fault voltage and negative-sequence fault current merely meet the direct proportion linear relationship at the fault point, is derived. Based on these, a unary linear regression analysis is performed, and the fault can be located according to the minimum residual sum function principle. The effectiveness of the proposed method is verified by PSCAD/EMTDC simulation platform. A large number of simulation results are used to verify the advantages on sampling frequency, fault resistance, and fault distance. More importantly, it provides a higher ranging precision and has extensive applicability.

show abstract

Section: Control System Of the Ac/dc Hybrid Systemmentioning

confidence: 99%

“…The single-phase-to-ground fault can be detected through the protection method proposed in [27], and the fault phase can also be selected.…”

mentioning

confidence: 99%

A Novel Single-Terminal Fault Location Method for AC Transmission Lines in a MMC-HVDC-Based AC/DC Hybrid System

Xue

Liu

et al. 2018

Energies

Self Cite

View full text Add to dashboard Cite

show abstract

“…According to the foregoing analysis, the device outputs three‐phase symmetrical current under symmetrical and asymmetrical conditions, so it is equivalent to a controlled positive‐sequence current source

{\dot{I}}_{G}

. The relationship between the output current of the device and the positive‐sequence voltage of the point of common coupling depends on the fault ride through (FRT) strategy of the device . Since the criterion proposed in this paper is not affected by the FRT strategy, the details about FRT strategy is not given .…”

Section: A Directional Criterion Based On Phase Relationships Among Nmentioning

confidence: 99%

“…On one hand, traditional power directional elements require additional potential transformers (PTs), which would increase the investment and the wiring complexity of secondary system; on the other hand, the output characteristics of a back‐to‐back VSC‐based interconnection device are influenced by its control strategy , and therefore the phase difference between the output current and voltage of the device is decided by its control strategy. Therefore, the traditional power directional component is not applicable to AC networks connected with back‐to‐back VSC‐based interconnection devices.…”

Section: Introductionmentioning

confidence: 99%

A criterion for non‐voltage directional elements applied in AC networks connected with VSC‐based interconnection devices

Xue

Shi

Huang

et al. 2018

IEEJ Transactions Elec Engng

Self Cite

View full text Add to dashboard Cite

The application of voltage source converter (VSC)-based interconnection devices or distributed generators (DGs) in an AC distribution system makes the network change from a single-terminal power supply network to a multi-terminal power supply network. However, traditional three-section current protection applied in AC distribution networks is not capable of identifying the direction of the fault, and therefore it is necessary to install directional elements to ensure the reliability of the threesection current protection. The phase relationships among negative-sequence currents under phase-to-phase faults that happen at different locations in the AC distribution network connected with back-to-back VSC-based interconnection device are derived first in this paper. Then a novel criterion based on the phase relationships among the negative-sequence currents flowing through the protected line and the other two branches emanating from the same bus is proposed for fault direction identification. The proposed directional criterion is applicable to multi-terminal power supply networks containing VSC-based interconnection devices or VSC-interfaced DGs, with three or more branches emanating from each bus. The proposed directional criterion does not require potential transformers (PTs), and is hardly affected by transient resistance. Under a symmetrical fault, negativesequence current can be obtained by delaying the filtering data window of any one of three phases, and the dead zone of traditional directional elements when the fault happens at the outlet of the relay can be avoided. The validity of the proposed criterion is verified by several PSCAD simulation results.

show abstract

“…In particular, PV power stations have some impact on traditional current protection and may lead to protection maloperation [16]. The effect of voltage source converter based high voltage direct current (VSC-HVDC) interconnectors on distance protection of transmission lines has also been analyzed in [17,18]. Additionally, a novel pilot protection principle was proposed in [17].…”

Section: Introductionmentioning

confidence: 99%

Adaptability Analysis of Fault Component Distance Protection on Transmission Lines Connected to Photovoltaic Power Stations

Liang

Zha

et al. 2019

Energies

View full text Add to dashboard Cite

Photovoltaic (PV) power stations tend to have a relatively weak infeed characteristic, unlike conventional synchronous generators. The limited overcurrent capability of power electronic devices and the controllability of grid-connected inverters mean that PV power stations will cause changes in the characteristics of faults on transmission lines. To analyze the adaptability of fault component distance protection on transmission lines connected to PV power stations, a unified phasor expression for the fault current of a PV power station side under various control strategies was deduced in this paper. This expression is then used to derive the equivalent impedance on the PV power station side and the additional impedance. The equivalent impedance and additional impedance are affected greatly by the active and reactive power commands, control targets, and fault conditions. These aspects of a PV power station may cause malfunctions, which can thereby reduce the reliability of fault component distance protection on transmission lines connected to PV power stations. A simulation model of a PV power station was established in PSCAD/EMTDC and the correctness of theoretical analysis was verified by the simulation results.

show abstract

The Applicability of Traditional Protection Methods to Lines Emanating from VSC-HVDC Interconnectors and a Novel Protection Principle

Cited by 12 publications

References 19 publications

A Novel Single-Terminal Fault Location Method for AC Transmission Lines in a MMC-HVDC-Based AC/DC Hybrid System

A Novel Single-Terminal Fault Location Method for AC Transmission Lines in a MMC-HVDC-Based AC/DC Hybrid System

A criterion for non‐voltage directional elements applied in AC networks connected with VSC‐based interconnection devices

Adaptability Analysis of Fault Component Distance Protection on Transmission Lines Connected to Photovoltaic Power Stations

Contact Info

Product

Resources

About