Extinction angle predictive control strategy for commutation failure mitigation in HVDC systems considering voltage distortion

Liu, Lei; Lin, Senshang; Liao, Kai; Sun, Peiyao; Deng, Yujia; Li, Xiaopeng

doi:10.1049/iet-gtd.2019.0619

Cited by 30 publications

(11 citation statements)

References 16 publications

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“…Based on Equations ( 3), (16), and (17), the relationship between the extinction angle and AC voltage after the disturbance can be described by Equation (18):…”

Section: Voltage Index For Instabilitymentioning

confidence: 99%

“…Appropriate algorithms are used to optimize its parameters, 11 and the voltage‐current characteristic of a VDCOL is improved to be described by the monotonically increasing concave function 12 . 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.…”

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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“…Based on Equations ( 3), (16), and (17), the relationship between the extinction angle and AC voltage after the disturbance can be described by Equation (18):…”

Section: Voltage Index For Instabilitymentioning

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

View full text Add to dashboard Cite

show abstract

“…The authors of [13] used a new power electronic equipment called enhanced line-commutated converter (E-LCC), which is able to mitigate HVDC's subsequent CFs because of its fully controlled sub-modules. Reference [14] proposed an extinction angle predictive (EAP) control strategy that estimates the forthcoming commutation stress based on the commutation voltage waveform and ensures a better sensitivity for HVDC commutation voltage distortion. The authors of [15] adjusted the active power of HVDC systems according to the risk prediction results of subsequent CFs, so as to reduce the reactive power demand in the process of HVDC recovery, which can effectively mitigate HVDC's subsequent CFs.…”

Section: Introductionmentioning

confidence: 99%

An Active Power Coordination Control Strategy for AC/DC Transmission Systems to Mitigate Subsequent Commutation Failures in HVDC Systems

et al. 2021

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Subsequent commutation failures (CFs) in HVDC systems will cause large-scale power flow transfer in AC/DC transmission systems and lead to overload risk in HVAC systems. In order to cope with these effects, a power coordination control strategy for the AC/DC transmission system with high-proportion wind power is proposed. Firstly, a model of the AC/DC transmission system considering the large-scale wind farms access is established by analyzing the power transmission characteristics of the AC/DC transmission system with high-proportion wind power, and the power transmission characteristics are analyzed after subsequent CFs. Secondly, the HVDC subsequent CFs can be mitigated by adjusting DC power transmission, while the active power output of the sending-end AC system is reduced by active control of wind turbine generators (WTGs) to reduce the overload risk of the HVAC system. Finally, the proposed power coordination control strategy is simulated and verified based on the established simulation model and actual power grid, and the results show that this strategy can effectively mitigate HVDC’s subsequent CFs and reduce the overload risk in HVAC systems.

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“…MMC based VSC technology is the most advanced and preferred technology due to salient advantages such as modularity and multilevel operation, highest control flexibility, weak grid interconnection, highest efficiency and reliability [4,5]. Despite technical maturity, LCC converters still face most serious problem of commutation failure at inverter which can occur by lower AC voltage [6]. LCC is also not selfcommutated and requires a strong AC grid for proper operation.…”

Section: Introductionmentioning

confidence: 99%

Adaptive fault recovery strategy of LCC‐MMC based hybrid HVDC

Hussain

Song

Wang

et al. 2021

IET Generation Trans & Dist

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Hybrid HVDC consisting of line commutated converter (LCC) on rectifier side and modular multilevel converter (MMC) on inverter side is the favourable future trend of HVDC projects utilising the advantages of both converter technologies. However, fault clearing and adaptive restart capabilities of such hybrid HVDC are not much investigated in the literature. In this paper fault clearing of hybrid HVDC transmission line is investigated using mechanical DC breaker at MMC terminal and forced firing angle retardation at LCC terminal. Then, the characteristics of the line voltages are analysed during the fault blocking states of converters to clear the transient fault. Characteristics of the line voltages of LLC rectifier have shown prominent difference under permanent and temporary fault states, and also dependent on the severity of fault. Therefore, based on line voltage characteristics, a restart strategy is proposed for hybrid HVDC which is adaptive to the fault characteristics. Several PSCAD/EMTDC based simulation studies are conducted to validate the proposed fault recovery strategy. Simulation results validate the effectiveness of the proposed strategy for hybrid HVDC under DC line faults. wileyonlinelibrary.com/iet-gtd IET Gener. Transm. Distrib.

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Extinction angle predictive control strategy for commutation failure mitigation in HVDC systems considering voltage distortion

Cited by 30 publications

References 16 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

An Active Power Coordination Control Strategy for AC/DC Transmission Systems to Mitigate Subsequent Commutation Failures in HVDC Systems

Adaptive fault recovery strategy of LCC‐MMC based hybrid HVDC

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