A preliminary look at the feasibility of VSC HVdc in Manitoba

Jacobson, David; Wang, P.; Mohaddes, M.; Rashwan, Mohamed; Ostash, R.

doi:10.1109/epec.2011.6070258

Cited by 11 publications

(3 citation statements)

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“…Bipolar converter configurations consisting of a 12-pulse converter for each positive and negative pole are the most commonly implemented HVDC circuits [21]. Thus, giving two independent DC transmission lines, each capable of carrying half the rated Pdc capacity.…”

Section: System Modelmentioning

confidence: 99%

Line Commutated Converter Response during Total and Partial De-Blocking of a Bipolar MTDC System

Oni

Swanson

Carpanen

2021

JERA

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This paper focuses on the fault blocking analysis and operational issues associated with MTDC systems incorporated in an AC network. The dynamic modelling of a line-commutated converter based bipolar multi-terminal direct current (LCC MTDC) system are shown, and the dynamic response of the converter during a DC converter fault is discussed. The converter controller design for both rectifiers and the inverters system was modelled for a realistic active power and extinction angle (γ) control with consideration to the VI characteristics of all the converter stations. An overall power controller was modelled for both converter pole. Two operational scenarios of converter fault were simulated using PSCAD EMTDC. The converter firing angle and extinction angle, as well as the voltage-dependent current order limiter, was monitored and plotted on a graph. Results show that the MTDC link became unstable during the full deblocking stage with a continuous occurrence of commutation failure. Furthermore, the results presented in this paper show that during partial converter de-blocking showed a favourable performance, as the power system remains stable and commutation failure of the MTDC system is prevented.

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Section: System Modelmentioning

confidence: 99%

Line Commutated Converter Response during Total and Partial De-Blocking of a Bipolar MTDC System

Oni

Swanson

Carpanen

2021

JERA

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“…The mechanism and influencing factors of commutation failure were analyzed in detail in the literature [1,2], and the main cause of commutation failure was summarized as a too small extinction angle under the operation state. In order to effectively improve the safe operation level, the power grid topology was improved to carry out the commutation failure predictive control [3]; a new topology based on fixed capacitor and controllable capacitor commutation converter is proposed in [4]; another widely used measure is adding dynamic var compensation equipment such as static var compensator (SVC), static var generator (SVG), and synchronous condensers at the receiving end [5,6], which can meet the var demand of converter station and improve the voltage recovery speed; some valuable studies calculate the voltage security region to guarantee the voltage stability margin under N-1 faults [7][8][9] proposes a novel method to discriminate the critical commutation failure region of multi-infeed HVDCs system and the critical failure impedance boundaries on topology diagram can be therefore delimited by examining each bus in the AC system; some other valuable works in the literature [10,11] have studied the influence of electrical distance on the stability of LCC-HVDC. The above research greatly improves the stability and security of power system operation and the commutation failure is effectively restrained.…”

Section: Introductionmentioning

confidence: 99%

Influence of Synchronous Condensers on Operation Characteristics of Double-Infeed LCC-HVDCs

Xu¹,

Fan

Niu

et al. 2021

Processes

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Considering the advantages that dynamic reactive power (var) equipment (such as synchronous condensers (SCs), which can control var independently and improve voltage stability), SCs are widely used in AC/DC hybrid power grid to provide emergency var and voltage support. In order to evaluate the dynamic var reserve capacity of SCs and analyze the influence of SCs on the operation characteristics of power system, a model with double-infeed line-commutated converter-based high-voltage direct currents (LCC-HVDCs) and SCs is established. Through theoretical derivation and PSCAD/EMTDC simulation, the effects of SCs on the operation characteristics of double-infeed LCC-HVDCs networks are studied. Then, the non-smooth voltage waveform of electromagnetic transient simulation is approximately transformed into smooth waveform by data fitting method. Finally, the processed voltage waveform is searched step by step to explore the boundary of voltage safety region to determine the dynamic var reserve capacity of SCs. The numerical results show that SCs can enlarge the voltage security region of the direct current (DC) subsystem, thus effectively improving the steady-state and transient security level of the double-infeed LCC-HVDCs networks.

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“…With the increase in DC transmission projects, different types of HVDC systems tend to feed into power grids with short electrical distances. Thus, hybrid dual-infeed or multi-infeed HVDC systems have emerged worldwide [1,2].…”

Section: Introductionmentioning

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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A preliminary look at the feasibility of VSC HVdc in Manitoba

Cited by 11 publications

References 0 publications

Line Commutated Converter Response during Total and Partial De-Blocking of a Bipolar MTDC System

Line Commutated Converter Response during Total and Partial De-Blocking of a Bipolar MTDC System

Influence of Synchronous Condensers on Operation Characteristics of Double-Infeed LCC-HVDCs

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

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