Reliability Improvement Strategies for HVDC Transmission System

Hong, Yidong; Yu, Tao

doi:10.4236/epe.2013.53b011

Cited by 11 publications

(8 citation statements)

References 4 publications

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“…If the water channel is blocked, the element is 0; otherwise, it is 1. Formula (2.12) is as follows [24,25]:…”

Section: ) Structure Functionmentioning

confidence: 99%

Evaluating and Monitoring Methods of hvdc valve radiator blockage Based on Applied Heat Transfer

Zhang¹,

Li²,

Yang³

et al. 2021

PIER C

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Valve radiator blockage is a serious problem endangering the safety of thyristor. At present, there are no effective methods for blockage evaluation and monitoring. This paper analyzes the heat dissipation state of a radiator under different blocking conditions and divides it into abnormal heat dissipation and normal heat dissipation. Then, based on reliability theory, the tolerance index ψ for blockage and the probability index θ for overheating are proposed to evaluate the blockage hazard of the thyristor. Also, the thermal circuit model of the valve group is established to monitor radiator blockage. According to the model, the corresponding relationship between radiator blockage and valve temperature distribution is solved, and the blockage detects index ⟨W ⟩ based on device temperature is given to judge radiator block. Through the infrared monitoring temperature solution, ⟨w⟩ judgment of radiator blockage is consistent with the set blockage.

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“…If the water channel is blocked, the element is 0; otherwise, it is 1. Formula (2.12) is as follows [24,25]:…”

Section: ) Structure Functionmentioning

confidence: 99%

Evaluating and Monitoring Methods of hvdc valve radiator blockage Based on Applied Heat Transfer

Zhang¹,

Li²,

Yang³

et al. 2021

PIER C

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“…The faults in OHTL are involves the arcing phenomena triggered by the dust, humidity and the weather factor. The underground cable faults are less frequent, but its more permanent, that's occurring due to the electrical or environmental stresses and insulation damage [8][9][10][11][12]. The protection system should be providing fast for operation, localizing fault, reliability, selectivity and take appropriate action to isolate the fault zone.…”

Section: Stability In Hvac and Hvdc Systemsmentioning

confidence: 99%

“…Figure3 shows the power angle curve for the power system operation, where, atstable operations for the power system the system operates at δ 0 , the output of electric power produces by electric torque that equalized with the mechanical torque which applied to the rotor shaft for the generator [13].At any fault in the system, its will leads to increasing in the load current, so at this moment the mechanical power for the generator not equalized with the electrical power for the electrical loads, this case known an unstable condition in the system that's will increase the power angle to 90 degrees. At this point, the load current could only be met by increasing voltage source E s , E R .Left source has a phase angle advance equal to θ, and this angle will vary during the fault [9][10][11][12][13][14]. The power transferred from one source to another reach to maximum value P MAX when angle δ is 90 degrees, by increase the angle δ , this will cause a decrease of power transfer.…”

Section: Hvac Transient Stability Systemmentioning

confidence: 99%

“…The HVDC has the unusual ability to connect asynchronous networks; this capability will extend in the future with greater numbers of micro-grids and more using of renewable energy systems in modern power systems [9]. Furthermore, HVDC technologies can provide stability with controlling of power flow, and the ability to segment parts of the power system all of which can enhance the grid's flexibility, reliability, and resilience [10]. This paper discusses the HVAC transmission system and HVDC operation system at stable condition, also shows the fault current result at faults due to HVAC and HHDC system to be used with transmission system.…”

Section: Introductionmentioning

confidence: 99%

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HVDC over HVAC Transmission System: Fault Conditions Stability Study

2019

International Journal of Research Studies in Electrical and Ele

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Electric Faults can be defined as the flow of a massive current through an alternative path which leads to cause serious equipment's damage, interruption of power, personal injury or death. High Voltage Alternating Current (HVAC) is the most effective and efficient way for energy transmission in modern power systems around the world. But, it's important to use High Voltage Direct Current (HVDC) system to link between different frequency networks and at transmitting energy on very long distance. HVDC operates at one side "converter station", where, the AC is converted to DC, which is then transmitted from sending end converter station, converted back to AC at receiving end to feed the other electrical network. This paper discusses the performance of the electrical grid system at the fault occurrence in HVAC and HVDC system. Also, this paper introduces the mathematical calculation steps at different faults conditions in the transmission line. The simulation of the fault current in this paper has been performed by using MATLAB/Simulink to compare the output fault current in HVAC and HVDC system.

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“…Nowadays, the level of confiability of HVDC link must be greater than double AC line utilization [3] [4] [5].…”

Section: Introductionmentioning

confidence: 99%

HVDC Grid Segmentation Analysis for Blackouts Reduction

Santos¹,

Jota²

2017

JPEE

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Segmentation of large AC systems through DC links introduces a new concept that utilizes the advantages of direct current transmission to improve network reliability and increase power transfer capacity. Technical literature argues that the segmentation of the AC network and the introduction of DC links at these systems connection points bring benefits to system operation, once contingencies generated on one side of the DC connection point would not be reflected on the other side of DC connection, thereby reducing the likelihood of cascading shutdowns and blackouts due to load restraint on transmission lines and transformers. Amidst this scenario, this paper presents a study of the main topics regarding the use of this new network segmentation philosophy, bringing a practical point of view for the use of this concept at the electrical power system planning. The effect of DC segmentation before a contingency that would initiate major outages in an adapted electrical system model IEEE-14 bus is studied and simulations have been performed with test HVAC systems and segmented by HVDC link. The results have been compared, principally in relation to the voltage bus, reactive power generation, system losses and power flow at the lines, and demonstrated that this new concept improved the grid reliability.

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Reliability Improvement Strategies for HVDC Transmission System

Cited by 11 publications

References 4 publications

Evaluating and Monitoring Methods of hvdc valve radiator blockage Based on Applied Heat Transfer

Evaluating and Monitoring Methods of hvdc valve radiator blockage Based on Applied Heat Transfer

HVDC over HVAC Transmission System: Fault Conditions Stability Study

HVDC Grid Segmentation Analysis for Blackouts Reduction

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