Commutation failure caused by AC filter switching In HVDC system

Li, Meng; Zheng, Lei; Shi, Fang; Li, Kuan

doi:10.1049/joe.2018.8786

Cited by 4 publications

(4 citation statements)

References 3 publications

(3 reference statements)

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“…where ω d = ω n 1 − ξ 2 denotes the oscillation frequency, and β = tan −1 √ 1−ξ 2 ξ . The impulse response peak value is: y(t P ) = ω n e −β/tanβ (18) It can be seen that the peak value and the time of the first oscillation of the unit impulse response curve of the second-order linear system are mainly determined by the natural oscillation frequency and the damping ratio of the system.…”

Section: The Power Oscillation Mechanism Of An Ac System Caused By Cfsmentioning

confidence: 99%

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AC Tie-Line Power Oscillation Mechanism and Peak Value Calculation for a Two-Area AC/DC Parallel Interconnected Power System Caused by LCC-HVDC Commutation Failures

Sun

Liu

2020

Energies

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With the rapid development of ultra-high-voltage (UHV) AC/DC, especially the step-by-step upgrading of the UHV DC transmission scale, security presents new challenges. Commutation failure (CF) is a common fault in line commutated converter (LCC) high-voltage direct current (HVDC) power systems. Once failure happens, it may cause power oscillations in a system. In this paper, taking a two-area AC/DC parallel interconnected power system as the example, based on the impulse response model of second-order linear system, the mechanism of power oscillation on the AC tie-line caused by CF are clarified. It is proved that the peak value of the AC tie-line power oscillation is mainly determined by the DC power and the equivalent CF duration, the frequency and damping ratio of dominant area oscillation mode. Meanwhile, the peak time is mainly determined by the oscillation frequency. Finally, the correctness and effectiveness of the algorithms are verified by a simulation analysis of an extended IEEE-39-bus AC/DC parallel interconnected power system. These research results can provide a basis for the arrangement of the operating modes and the formulation of control measures for interconnected power grids.

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Section: The Power Oscillation Mechanism Of An Ac System Caused By Cfsmentioning

confidence: 99%

“…In recent years, LCC-HVDC transmission has been widely used in the project of 'west to east transmission,' 'north and south mutual supply' and 'national networking' in China [18]. Due to the use of semi-controlled thyristor devices as commutation elements, the HVDC transmission process depends on the power supply provided by the AC system.…”

Section: Introductionmentioning

confidence: 99%

AC Tie-Line Power Oscillation Mechanism and Peak Value Calculation for a Two-Area AC/DC Parallel Interconnected Power System Caused by LCC-HVDC Commutation Failures

Sun

Liu

2020

Energies

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“…This method can be applied during the AC filter switching. When a step-wise operation occurs in a capacitor bank of AC filters, an instantaneous fluctuation occurs on the extinction angle of the LCC inverter [47], [48]. For instance, when the steady-state AC voltage is higher than the rated value, a capacitor bank is turned off to lower the AC voltage.…”

Section: B Mmc-assisted Gamma-kick Functionmentioning

confidence: 99%

DC Power Control Strategy of MMC for Commutation Failure Prevention in Hybrid Multi-Terminal HVDC System

et al. 2020

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This paper presents a control strategy for a modular multilevel converter (MMC) to prevent commutation failure of a line-commutated converter (LCC), forming a three-terminal hybrid HVDC transmission system, where one LCC sending end is connected to the large generation and two receiving ends (LCC inverter and MMC) are located near the load center. This configuration, one of the potential options, has been proposed to strengthen Korea electric power transmission system through the optimized use of existing assets and rights-of-way, extremely challenging to secure. The MMC power control strategy has been developed to regulate the AC voltage and the extinction angle of the LCC inverter. This indirect yet effective active and reactive power control of the LCC inverter terminal helps prevent the commutation failure (CF) of the LCC in emergency and maximize the benefits of the costly planning option. By establishing a theoretical foundation for this power control problem and relationship among the control parameters, we quantify the active power reference for MMC to secure the desired LCC extinction angle. A coordinated strategy has been developed for the AC filter, the on-load tap changer of a transformer, along with the MMC control to lower the risk of CF and its catastrophic impact on the whole power system. The validity and performance of the proposed control methods are demonstrated for the real Korea electric power planning cases using a real-time power system simulator. INDEX TERMS Commutation failure, extinction angle, gamma-kick, hybrid multi-terminal HVDC system, weak AC system.

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“…AC filter plays an important role in filtering harmonics, maintaining AC bus voltage stability and reactive power balance in converter station. Therefore, the rationality and stable operation of AC filter configuration are very important for DC transmission [1,3]. A total of 9 filter tripping faults occurred in 3 converter stations under the jurisdiction of a province, most of which were bird damage and foreign matter lapping faults under bad weather conditions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of AC Filter Tripping Accident based on UHV Converter Station

Ai,

Bi,

et al. 2024

J. Phys.: Conf. Ser.

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An AC filter tripping accident occurred in a converter station of the North China Power Grid in 2019, which seriously affected the safe and stable operation of the power grid. In this paper, combined with the configuration of the AC filter in the converter station and the principle of capacitor unbalance protection, the tripping mechanism of the AC filter is explained. It is considered that the direct cause of the tripping of the AC filter is the short-circuit discharge phenomenon between the layers caused by the dead trees (grass) branches on the capacitor tower, which causes the instantaneous fault between the layers of the low-voltage capacitor, and finally leads to the action of the capacitor unbalance protection. From the perspective of operation and maintenance, some practical preventive measures are put forward, which will help to improve the safety of AC filter operation in the future, and then improve the reliability of DC transmission system, especially during the peak summer, peak winter and special power protection period, to ensure that there will be no fluctuation in DC load transmission and protect the safe and stable operation of power grid.

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Commutation failure caused by AC filter switching In HVDC system

Cited by 4 publications

References 3 publications

AC Tie-Line Power Oscillation Mechanism and Peak Value Calculation for a Two-Area AC/DC Parallel Interconnected Power System Caused by LCC-HVDC Commutation Failures

AC Tie-Line Power Oscillation Mechanism and Peak Value Calculation for a Two-Area AC/DC Parallel Interconnected Power System Caused by LCC-HVDC Commutation Failures

DC Power Control Strategy of MMC for Commutation Failure Prevention in Hybrid Multi-Terminal HVDC System

Analysis of AC Filter Tripping Accident based on UHV Converter Station

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