A New Recovery Strategy of HVDC System During AC Faults

Wang, Juanjuan; Huang, Menghua; Fu, Chenglong; Li, Huan; Xu, Shungang; Li, Xiaohua

doi:10.1109/tpwrd.2019.2892410

Cited by 103 publications

(26 citation statements)

References 12 publications

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“…A three‐phase circuit fault is applied at 1.5 seconds with the duration of 0.05 second at the inverter busbar, which causes successive CF. For strategy proposed in Reference 17, DC current increases rapidly during recovery due to the favorable reactive power consumption following the slight fault, and then it fails to eliminate subsequent CF as shown in Figure 12A,B. The reason for the above behavior becomes apparent on inspecting the output of inverter controllers and DC current.…”

Section: Case Studymentioning

confidence: 99%

“…Researchers also propose novel methods for commutation margin evaluation, 13,14 and relevant results can be introduced into the original control system of DC current 15 or the constant extinction angle control 16 to achieve better recovery performance. In Reference 17, the original control system of DC current is even completely replaced by the proposed one, and the DC current order is determined according to the expected reactive power consumption of inverters. However, this type of method is not applicable to HVDC that has been put into operation and it is uneconomical to reform the original control system.…”

Section: Introductionmentioning

confidence: 99%

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Current order‐based emergency control strategy for subsequent commutation failure elimination in HVDC

Zheng

Tang

Zhang³

et al. 2021

Int Trans Electr Energ Syst

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Subsequent commutation failure (CF) elimination in line-commutated-converter-based high-voltage direct current (LCC-HVDC) is an essential issue of AC/DC hybrid power systems. Since methods based on improving HVDC control systems or advancing the firing angle have inherent limitations, adjustment of the DC current order is regarded as an effective emergency control strategy for HVDC that has been put into operation. However, existing methods sometimes result in failed CF elimination due to improper control timing of DC current. In order to determine proper control timing, novel voltage indexes are put forward in this article to identify stability or instability of the hybrid system. Then, the DC current order is adjusted in real time to eliminate subsequent CF according to the evaluation results given by the proposed voltage indexes. The control strategy is simulated in the PSCAD/EMTDC platform as well as actual power system, and the simulation results compared with those of existing schemes verify the effectiveness and advancement of the proposed strategy on subsequent CF elimination.

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Section: Case Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Current order‐based emergency control strategy for subsequent commutation failure elimination in HVDC

Zheng

Tang

Zhang³

et al. 2021

Int Trans Electr Energ Syst

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“…A great amount of research in the field of CF analysis has proposed that a decrease in the extinction angle of the inverter and the drop of commutation voltage are the primary causes of the CF (Yao et al, 2020;Xiao et al, 2016;Xue et al, 2016). In reference (Wang J. et al, 2019), based on the expected value of reactive power consumption of inverter stations, a method for calculating DC command values by real-time measurement of AC bus voltage is proposed. In reference (Guo et al, 2015), a method of setting different current command values for different fault types of AC system is proposed.…”

Section: Introductionmentioning

confidence: 99%

Determining Region Boundaries of Critical Commutation Failures in Multi-Infeed HVDC Systems Under Unbalanced Short Circuit Faults

Zhang

et al. 2021

Front. Energy Res.

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This paper presents a region boundaries determination method for critical commutation failures (CF) in multi-infeed high-voltage direct-current (HVDC) systems under unbalanced short circuit faults. By using the nodal impedance matrix, a calculation approach for the converter extinction angles is deduced. First, the extinction angles under unbalanced short circuit faults are calculated. If the extinction angle of a bus is less than the minimum extinction angle, the bus is a failed bus set. By this means, region boundaries of critical commutation failures are demarcated by examining each bus in the AC system. Finally, the effectiveness of the proposed approach was verified by using a modified IEEE 39-bus system.

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“…Under normal operating conditions, the DC control system regulates the rectifier DC current and the extinction angle of the inverter side through a proportional-integral (PI) controller [7]. When a fault occurs in an AC system inverter, the voltage dependent current order limiter (VDCOL) can be promptly put into operation resulting in reduction of the DC current order value, which can improve the recovery ability of the DC system after being subjected to a fault [8].…”

Section: Introductionmentioning

confidence: 99%

“…Later, the detailed modeling of the CIGRE HVDC benchmark model was built in PSCAD, PSB, and EMTP simulation software [11][12]. Based on this model, many researchers have analyzed the influence of the problems in existing AC/DC systems and have further deployed control strategies through simulation analysis [8,[13][14]. In terms of experimental verification, control strategies for preventing DC commutation failure caused by AC system faults have been proposed [15][16][17], and the mechanism of the cascading fault was discussed [18].…”

Section: Introductionmentioning

confidence: 99%

Real-Time Calculation Method of DC Voltage and Current to Eliminate the Influence of Signal Delay

Yin

2020

IEEE Access

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In this study, the influences of the signal delay duration between rectifier and inverter in ultra-high voltage direct current (U-HVDC) transmission systems have been analyzed. The simulation results with different signal delay time under the same fault condition show that the signal delay time has a significant influence on the control system response during the fault and recovery periods. In the worst condition, it may lead to a commutation failure in the inverter. To eliminate the influence of the signal delay time on the DC control system, a fast calculation method for computing the voltage and current has been proposed by establishing the equivalent capacitance and inductance of the DC line. A voltage dependent current order limiter is added in the rectifier control system, which can calculate the DC current order value. Based on this concept, this paper proposes an improved control strategy to eliminate the influence of signal delay. The analysis and simulation results show that the calculation method can effectively improve the response speed and shorten the fault recovery time of the HVDC systems. INDEX TERMS commutation failure, DC voltage, high voltage DC transmission, signal delay time This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication.

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A New Recovery Strategy of HVDC System During AC Faults

Cited by 103 publications

References 12 publications

Current order‐based emergency control strategy for subsequent commutation failure elimination in HVDC

Current order‐based emergency control strategy for subsequent commutation failure elimination in HVDC

Determining Region Boundaries of Critical Commutation Failures in Multi-Infeed HVDC Systems Under Unbalanced Short Circuit Faults

Real-Time Calculation Method of DC Voltage and Current to Eliminate the Influence of Signal Delay

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