Analysis and Enhanced Control of Hybrid-MMC-Based HVDC Systems During Asymmetrical DC Voltage Faults

Hu, Jiabing; Xu, Kecheng; Lin, Lei; Zeng, Rong

doi:10.1109/tpwrd.2016.2568240

Cited by 97 publications

(54 citation statements)

References 26 publications

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“…The specific parameters of the test model are listed in Table 1, and the fault location algorithm was tested with MATLAB (R2013b, MathWorks, Natick, MA, USA). The converter transformer adopted a Yn/∆ connection mode, and the ∆ side of the transformer adopted the small fault current grounding method, which contains star-connected reactors with high grounding resistance [30]. The transmission line adopted the distributed parameter model.…”

Section: Case Studymentioning

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

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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.

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Section: Case Studymentioning

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

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“…The control system is bound to increase the AC current to compensate for the energy loss. If no additional arm energy balance control method is adopted, this will lead to a voltage rise in the lower arm capacitance [20]. Finally, the energy imbalance of upper and lower arms results in system collapse.…”

Section: Multi-terminal MMC Fault Current Circuitmentioning

confidence: 99%

“…For MMC DC faults, the research has been mainly focused on the pole-to-pole faults [16][17][18][19], and there has been little work about DC pole-to-ground faults, which are more likely to happen [20]. The grounding method of MMC-MTDC is mostly a small current grounding system which can limit the amplitude of fault currents, but the voltage of healthy DC lines and AC transformer secondary sides will be affected and then the lines and equipment operation safety is threatened on the grid, so it is of great practical significance to study on the fast protection of pole-to-ground faults in DC power systems.…”

Section: Introductionmentioning

confidence: 99%

Pole-to-Ground Fault Analysis and Fast Protection Scheme for HVDC Based on Overhead Transmission Lines

Xue

Lian

et al. 2017

Energies

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Flexible direct current (DC) transmission network technology is an effective method for large capacity clean energy access to power grids, but the DC short-circuit fault detection for it is a difficult problem. In this paper, the pole-to-ground fault transient characteristics in a multi-terminal DC power grid, based on overhead transmission lines and DC circuit breakers, are analyzed firstly. Then, a fast protection scheme is proposed according to the fault transient characteristics. Only local information is utilized for fault detection and location in the proposed scheme. Moreover, the scheme is verified to have the advantages of fast action speed, high reliability and the ability to resist the transition resistance. A four terminal DC power grid model based on actual engineering parameters is established in PSCAD/EMTDC, and the validity of the protection scheme under different fault conditions is verified by simulation results.

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“…The measuring system of the transient overvoltage was designed. The characteristics, effect on equipment insulation, and electromagnetic interference on the secondary equipment of the transient overvoltage were analyzed via a simulation test and a digital simulation method [6,7]. Meanwhile, the method of the disconnecting switch installed with the damping resistance to suppress the transient overvoltage was proposed.…”

Section: Introductionmentioning

confidence: 99%

Recognition Algorithm of Transient Overvoltage Characteristic Based on Symmetrical Components Estimation

Han¹,

Zhang²

2020

Symmetry

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The recognition of transient overvoltage characteristics is the premise of disturbance compensation of the transient overvoltage. Based on that, the recognition algorithm of transient overvoltage characteristics based on symmetrical components estimation was proposed. The generation mechanism of the transient overvoltage in gas insulated switchgear (GIS) was analyzed. Then, the transient overvoltage was measured via the capacitive sensor method. The three-phase voltage of ultra-high voltage grid was asymmetrical when the transient overvoltage appeared. At present, the asymmetrical three-phase voltage was decomposed into the superposition of a symmetrical positive-sequence component, a negative-sequence component, and a zero-sequence component via the symmetrical components estimation to build the superposition model. The model was decomposed via the trigonometric identity and the modified neural network of the least mean square learning rule was used to estimate the parameter vector of the characteristic quantity of the transient overvoltage in real time. The feasibility of the proposed algorithm was verified via comparing the simulation of the proposed algorithm and the algorithm based on dp transformation. The experimental results show that the proposed algorithm has the advantages of a small operand, high detection precision, and fast action.

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Analysis and Enhanced Control of Hybrid-MMC-Based HVDC Systems During Asymmetrical DC Voltage Faults

Cited by 97 publications

References 26 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

Pole-to-Ground Fault Analysis and Fast Protection Scheme for HVDC Based on Overhead Transmission Lines

Recognition Algorithm of Transient Overvoltage Characteristic Based on Symmetrical Components Estimation

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