Analysis and mitigation of low-frequency resonance in a long-distance UHVDC ±1100  kV system

Wang, Yunchao; Yu, Zhanqing; Mou, Ya; Ji, Yiming; Hu, Jun; Chen, Shuiming; He, Jinliang

doi:10.1016/j.epsr.2018.05.009

Cited by 12 publications

(3 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ultra-high voltage (UHV) transmission technologies are widely used in power transmission all over the world due to their high transmission voltages and large transmission capacities [1,2]. In 2019, the world's first ±1100 kV DC transmission line from Zhundong to Wannan in China was put into operation, belonging to the highest voltage class and having the largest transmission capacity in the world [3]. However, the increased transmission voltage placed higher requirements on dielectric materials [4].…”

Section: Introductionmentioning

confidence: 99%

Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites

Zhao¹,

Nie²,

Zhao³

et al. 2021

Energies

View full text Add to dashboard Cite

The substantial improvements in transmission voltage, which have been adopted to meet fast-growing energy demands, require more reliable power equipment and higher-quality insulating materials. The polytetrafluoroethylene (PTFE) nozzle, as the key part of a high-voltage circuit breaker, is often subjected to arc ablation and breakdown phenomena. Thus, it is very urgent to develop nozzles with better performance. In this study, PTFE/boron nitride (BN) composites were prepared. The relationships among the BN filler loading, thermal transition properties, spectral reflectance properties, arc ablation resistance, and AC dielectric breakdown performances, as well as their corresponding mechanisms, were studied. Experimental results show that the thermal conductivity and thermal diffusivity of PTFE/BN composites increased monotonously with BN loading, and that both parameters were improved by 41% and 44%, respectively, for 11 wt % composites compared with pure PTFE. Moreover, PTFE/BN composites had higher light reflectance in the wavelength range from 320 to 2500 nm. The PTFE/BN composites presented better arc ablation resistance performance with increased BN loading, which was improved by 88.5%. It is thought that the increased thermal conductivity, thermal diffusivity, the strong light reflectance, and surface sediment after arc ablation contribute to the improvement in arc ablation resistance performance. The AC breakdown strength of PTFE/BN composites was enhanced by 30.93%, attributed to the good heat dissipation properties introduced by the BN fillers. Thus, filling BN into the PTFE matrix would be helpful to solve the equipment issue that comes from the improvement in transmission voltage.

show abstract

Section: Introductionmentioning

confidence: 99%

Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites

Zhao¹,

Nie²,

Zhao³

et al. 2021

Energies

View full text Add to dashboard Cite

show abstract

“…Ultra-high voltage direct current (UHVDC) transmission projects have seen a rapid uptake in some Asian countries in recent years [1,2]. To ensure the stable transmission of power, the converter stations of UHVDC systems need a large amount of reactive power, especially under conditions with more dynamic variation [3]. The lack of dynamic reactive power may threaten the voltage stability of AC bus in converter stations, therefore resulting in a series of serious faults, such as commutation failure, DC bipolar blocking, and so on [4].…”

Section: Introductionmentioning

confidence: 99%

Standstill Time-Domain Response Parameter Estimation of the Large Synchronous Condenser in Arbitrary Rotor Position

Zhou

Wang

2020

IEEE Access

View full text Add to dashboard Cite

The necessity to align the rotor with the d-q magnetic axes is the main obstacle for the wide application of synchronous machine standstill parameter tests, especially for the high-power units. This paper presents an arbitrary rotor position parameter estimation method for standstill time-domain response (SSTRs) tests and applied on a 300 MVar, 20 kV large synchronous condenser, a DC step voltage signal is selected as the input signal. Firstly, a frequency-domain Dalton-Cameron transformation is demonstrated and used to simultaneously obtain both axes' operational inductances in an arbitrary rotor position, thus eliminating the need for the rotor prepositioning process. Then, a novel analytical parameter estimation method combined with an I/T transformation is proposed, all the parameters of both axes are determined without extra tests, the mutual leakage flux between the field winding and the d-axis damper winding is also taken in account. To validate the proposed method, this test is carried out and its parameter estimation results are compared against that of the three-phase sudden short-circuit test and the traditional SSTR test. Estimation results are given in the form of I-type and T-type circuits, the maximum relative error no more than 6% and 10%, respectively. INDEX TERMS Parameter estimation, large synchronous condenser, standstill time-domain response, arbitrary rotor position NOMENCLATURE uabc stator three-phase voltage us stator input voltage iabc stator three-phase current ud, uq d-and q-axis voltage, respectively id, iq d-and q-axis current, respectively uf field winding voltage if, iD field and damper winding current, respectively iQ1, iQ2 q-axis damper winding 1, 2 current, respectively Ld, Lq d-and q-axis synchronous inductance, respectively Lad, Laq d-and q-axis armature reaction inductance, respectively Lsl stator leakage inductance Lfl, Ldl field and damper winding leakage inductance, respectively LQl1, LQl2 q-axis damper winding 1, 2 leakage inductance, respectively L d ' , L d '' d-axis transient and sub-transient inductance, respectively L q '' , L q ''' q-axis sub-transient and sub-subtransient inductance, respectively T d ' , T d '' d-axis transient and sub-transient shortcircuit time constant, respectively T d0 ' , T d0 '' d-axis transient and sub-transient opencircuit time constant, respectively T q '' , T q ''' q-axis sub-transient and sub-subtransient short-circuit time constant, respectively T q0 '' , T q0 ''' q-axis sub-transient and sub-subtransient open-circuit time constant, respectively Tf, TD field and damper winding leakage time constant, respectively ra, rs stator and armature resistance, respectively rf, rD field and damper winding resistance, respectively rQ1, rQ2 q-axis damper winding 1, 2 resistance, respectively  rotor position angle

show abstract

“…In 2012, the ±1100kV converter transformer prototype passed type test, and it could well meet the capability demands of national standard. In addition, the ±1100kV/5000A UHVDC thyristor valve has been developed by China XD Group [4]. The effective design of the above-mentioned main components can lay a good foundation for future UHVDC project.…”

Section: Introductionmentioning

confidence: 99%

Application Analysis and Prospect Forecast of HVDC Control System: A Survey

Zhou¹,

Fang²,

Chen³

2019

dtetr

View full text Add to dashboard Cite

In this paper, the development and actuality of high voltage direct current (HVDC) transmission technology in China are presented firstly. Then, taking the HVDC control system for a survey objective, the comparison and analysis of two different HVDC control systems produced by ABB and Siemens respectively are carried out. Besides, aiming at practical HVDC projects, the existing problems and defects of their control systems are summarized, and accordingly some possible solutions are suggested. At the end, the application trends of the HVDC control system are forecasted.

show abstract

Analysis and mitigation of low-frequency resonance in a long-distance UHVDC ±1100 kV system

Cited by 12 publications

References 8 publications

Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites

Arc Ablation Resistance and Dielectric Strength Properties of PTFE/BN Composites

Standstill Time-Domain Response Parameter Estimation of the Large Synchronous Condenser in Arbitrary Rotor Position

Application Analysis and Prospect Forecast of HVDC Control System: A Survey

Contact Info

Product

Resources

About