Distribution of electric field and structure optimisation on the surface of a ±1100 kV smoothing reactor

Wang, Ping; Zhao, Yingyu; Lv, Fangcheng; Li, Kang; Ding, Yongkun

doi:10.1049/iet-smt.2018.5154

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…It encoun-ters overheating and even fire in the running process in recent years, and it have been confirmed that the partial high temperature of coils is one of the main reasons [3,4]. Recently, the rain cover is often added at the top of reactor, to reduce the influence of external environment [5]. However, the heat dissipation conditions of coils gets worse after adding the rain cover, and partial encapsulation temperature rise may exceed the limit, which leads to the insulation and mechanical properties of the material changed, and consequently affects the safe and stable operation of the reactor in the power system.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance analysis and optimization design of dry type air core reactor with the double rain cover

et al. 2022

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In this paper, a fluid-thermal coupled finite element model is established according to the design parameters of dry type air core reactor. The detailed temperature distribution can be achieved, the maximum error coefficient of temperature rise is only 6% compared with the test results of prototype, and the accuracy of finite element calculate method is verified. Taking the equal height and heat flux design parameters of reactor as research object, the natural convection cooling performance of reactor with and without the rain cover is investigated. It can be found that the temperature rise of reactor is significantly increased when adding the rain cover, and the reasons are given by analyzing the fluid velocity distribution of air dcuts between the encapsulation coils. In order to reduce the temperature rise of the reactor with the rain cover, the optimization method based on the orthogonal experiment design and finite element method is proposed. The six factors of the double rain cover are given, which mainly affect the temperature rise of reactor, and the five levels are selected, the influence curve and contribution rate of each factor on the temperature rise of reactor are analyzed. The results show that the contribution ratio of the parameter H1, L1 and L2, are obviously higher than the parameter H2, L3 and ?, so the more attention should be paid in the design of double rain cover. Meanwhile, the optimal structural parameters of rain cover are given based on the influence curves, and the temperature rise is only 43.25?C. The results show that the optimization method can reduce the temperature rise of reactor significantly. In addition, the temperature distribution of inner encapsulations coils of reactor are basically the same, the current carrying capacity of coils can be fully utilized, which provides an important guidance for the optimization design of reactor.

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Section: Introductionmentioning

confidence: 99%

Thermal performance analysis and optimization design of dry type air core reactor with the double rain cover

et al. 2022

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“…In addition, recent researches scarcely focus on the stability of DC grids with DC equipment, such as the currentlimiting reactor, smoothing reactor. It is well known that the current-limiting reactor can assist the DC circuit breaker in removing DC faults [21][22][23], and the smoothing reactor can effectively suppress the harmonics of DC current, maintain the stability of DC side voltage, and reduce the impact of DC side voltage on the converter station [24][25]. However, such large-capacity reactors increase the electrical distance between converter stations, which adversely affect the stability of the DC grid and the control of DC voltage.…”

Section: Introductionmentioning

confidence: 99%

Small-Signal Stability Modeling for MMC-Based DC Grids With Voltage Slope Control and Influence Analysis of Parameters

Fan

LIU

2022

IEEE Access

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In the flexible DC grids, selections of slope coefficients in system level controls and designs of smoothing reactors have a crucial influence on the system stability. In order to obtain their optimal values, a comprehensive small-signal stability model with the DC voltage slope control and smoothing reactors is proposed in this paper. Firstly, the linear state-space model of the entire system based on the small-signal method is deduced according to the coupling equations between the inputs, the outputs, and state variables related to converter stations and the AC sides, controllers, and the DC grid with smoothing reactors. Meanwhile, the influences of the MMC bridge arm circulating current and the capacitor voltage fluctuation of the sub-module are considered in this model. Secondly, the impacts of control parameters, smoothing reactor parameters, and bridge arm inductances are analyzed on the system stability through the Lyapunov stability theory. Finally, the simulation of Zhangbei four-terminal DC grid project in China is established to testify the correctness of the presented small-signal model and the conclusions about the impact of parameters on the system stability. The proposed method will provide some theoretical guidance for the system design and the parameter selection in DC grid applications.INDEX TERMS DC grids, modular multilevel converter, small-signal method, slope control, smoothing reactor.

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“…One of the key procedures engaged with the inception and improvement of releases is the ionization of particles and atoms by high vitality electrons. Without any extremely applied electric field, the electrons move arbitrarily colliding with the gas atoms [4]. Within the sight of the electric field, be that as it may, the electrons are excited by the electric field and velocity toward the field [5].…”

Section: Introductionmentioning

confidence: 99%

Corona and Electric Field Distribution Analysis in 400 kV Line Insulators

Rao

Chinda

Kiran³

2021

Adv. technol. innov.

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The performance of insulator strings in transmission lines can be improved by corona rings owing to their electric field grading property. The insulation performance of the string depends on the corona ring parameter settings. In this study, the design of a corona ring for a 400 kV non-ceramic overhead line insulator is presented. Two parameters were altered during the investigation, ring measurement (R) and ring tube breadth (r) while maintaining a constant ring height (h). Based on electric field distribution, the proposed composite insulators were compared with glass insulators. Simulation studies were performed for the insulator strings, including corona rings with different design parameters. The corona discharge and optimal configuration results were analyzed, and it was found that the electric field was lower with composite insulators.

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Distribution of electric field and structure optimisation on the surface of a ±1100 kV smoothing reactor

Cited by 4 publications

References 11 publications

Thermal performance analysis and optimization design of dry type air core reactor with the double rain cover

Thermal performance analysis and optimization design of dry type air core reactor with the double rain cover

Small-Signal Stability Modeling for MMC-Based DC Grids With Voltage Slope Control and Influence Analysis of Parameters

Corona and Electric Field Distribution Analysis in 400 kV Line Insulators

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