An Improved Commutation Prediction Algorithm to Mitigate Commutation Failure in High Voltage Direct Current

Li, Xinnian; Li, Fengqi; Chen, Shuyong; Li, Yanan; Zou, Qiang; Wu, Ziping; Lin, Shian-Ru

doi:10.3390/en10101481

Cited by 15 publications

(8 citation statements)

References 17 publications

(21 reference statements)

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“…The active power variation P  of the sending-end grid should be less than the maximum allowable frequency deviation max P  to fulfill the grid frequency deviation constraints. By combining Equations (17) and (18), the active power constraint of the VSC-HVDC system can be expressed as follows:…”

Section: Commutation Failure Suppression Methods Based On Controllablementioning

confidence: 99%

A Commutation Failure Suppression Control Method Based on the Controllable Operation Region of Hybrid Dual-Infeed HVDC System

et al. 2018

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With the increased use of high voltage direct current (HVDC) systems, line commutated converters (LCC-HVDC) and voltage source converters (VSC-HVDC) tend to feed into AC systems over short electrical distances. The flexible power control of VSC-HVDC systems provides an effective approach to suppress the commutation failure of LCC-HVDC systems. A suppression method, based on a controllable operation region, is proposed in this study to reduce the probability of commutation failure in a hybrid dual-infeed HVDC system. First, the quantitative transient reactive power control requirement of VSC-HVDC inverter that could fulfill the suppression control boundary condition of commutation failure was analyzed. Given the maximum current constraint of the VSC-HVDC inverter and the primary frequency modulation constraint of the sending-end grid, a controllable operation region of the hybrid dual-infeed HVDC system was proposed. Furthermore, a commutation failure suppression control method, based on the controllable operation region, was proposed to mitigate continuous commutation failure. Finally, the validity and accuracy of the proposed method was verified by the simulation of PSCAD/EMTDC. The proposed control method can realize reasonable use of the reactive power control capability of the VSC-HVDC system, which effectively improves immunity to commutation failure of the LCC-HVDC system under grid fault.

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Section: Commutation Failure Suppression Methods Based On Controllablementioning

confidence: 99%

A Commutation Failure Suppression Control Method Based on the Controllable Operation Region of Hybrid Dual-Infeed HVDC System

et al. 2018

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“…Considering the transient voltage and current characteristics under single-and three-phase faults, the authors in [23] proposed a power component fault detection strategy to improve fault detection. Based on the CFPREV, the authors in [24] developed a sliding-window iterative algorithm of discrete Fourier transformation (DFT) to detect voltage harmonics. A harmonic voltage-time area criterion was proposed to detect CFs caused by harmonics [25].…”

Section: Introductionmentioning

confidence: 99%

“…For the method of calculating firing angle advancement, the authors in [26]- [28] used fuzzy logic based controllers to determine the extent of firing angle advancement, which can reduce the risk of CFs caused by the nonlinearity of thyristor valve models and the uncertainty of external disturbances. The authors in [21], [29]- [36] directly used the inverter AC voltage to calculate the required firing angle; While the authors in [24] used the harmonic characteristics of commutation voltage to calculate. These improved strategies can mitigate successive CFs to some extent, but it should be noted that by decreasing the inverter firing angle, the inverter reactive power consumption will increase, which will lead to further AC voltage drops.…”

Section: Introductionmentioning

confidence: 99%

Variable Extinction Angle Control Strategy Based on Virtual Resistance to Mitigate Commutation Failures in HVDC System

2020

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To mitigate commutation failures (CFs) and minimize the instability of HVDC systems due to AC faults or control mode ambiguity, a constant extinction voltage-time area based control strategy with virtual resistance is proposed. In this strategy, using sine-cosine components detector and considering zerocrossing phase shift of commutation voltage, the extinction angle setting value can be adjusted dynamically. Meanwhile, to reflect the characteristics of DC current during the fault and recovery process, a virtual resistance is introduced into the control system and DC voltage considering the voltage drop of the virtual resistance is taken as the input of voltage-dependent current order limiter (VDCOL). Through theoretical analysis, the proposed strategy not only reduces the firing angle dynamically, but also reduces DC current by lowering the current order on the rectifier side immediately when the AC voltage disturbance is detected, thereby further reducing the occurrence of CFs. Therefore, the control strategy can effectively suppress successive and intermittent CFs. The effectiveness of the proposed control strategy is verified by simulation of the single HVDC and multi-infeed HVDC model based on the CIGRE HVDC benchmark system, in which AC-DC current criterion of identifying CF and suppression ratio index are adopted. The simulation results show that the proposed control strategy can effectively mitigate CFs under single-phase and three-phase faults to a certain extent. Comparing with the existing control strategies based on controller modification, i.e. commutation failure prevention, DC current predictive control, smooth logic switching control and DC current limitation control strategy based on virtual resistance, the proposed control strategy is superior in mitigation effects. The average suppression rates of these strategies are 1.66%, 3.21%, 6.11%, 3.35%, and 8.33% under single-phase fault, respectively; with the rates of 1.4%, 2.72%, 4.97%, 0%, and 6.8% under three-phase fault, respectively.

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“…Once continuous CFs occur, they could result in significant direct current increases and thus lead to an overheating of converter valves that would shorten their lifespans [24,25]. To reduce the probability of a CF occurring, many papers have focused on improving algorithms [26][27][28], improving the DC control strategy [29][30][31] and adjusting the network topology [32]. A hybrid configuration had been proposed that inserted a dynamic series capacitor and added fixed parallel capacitors at the valve side of the converter transformer [33][34][35].…”

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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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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An Improved Commutation Prediction Algorithm to Mitigate Commutation Failure in High Voltage Direct Current

Cited by 15 publications

References 17 publications

A Commutation Failure Suppression Control Method Based on the Controllable Operation Region of Hybrid Dual-Infeed HVDC System

A Commutation Failure Suppression Control Method Based on the Controllable Operation Region of Hybrid Dual-Infeed HVDC System

Variable Extinction Angle Control Strategy Based on Virtual Resistance to Mitigate Commutation Failures in HVDC System

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

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