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Bifunctional direct current ice melting apparatus based on voltage source type current converter and ice melting method thereof

A voltage source type, DC ice-melting technology, applied in cable installation, output power conversion device, AC power input conversion to DC power output, etc., can solve the high reactive power demand of ice-melting power supply and the influence of system stability Large, difficult system power flow and other problems, to achieve the effect of reducing reactive power, improving power quality, and improving power factor

Inactive Publication Date: 2012-06-13
SICHUAN UNIV
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Problems solved by technology

After years of operation practice, the study found that the AC ice melting method has problems such as difficulty in changing the system power flow, high reactive power demand for ice melting power supply, great impact on system stability, and poor ice melting effect on lines with voltage levels of 500kV and above. This method is gradually phased out

Method used

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  • Bifunctional direct current ice melting apparatus based on voltage source type current converter and ice melting method thereof
  • Bifunctional direct current ice melting apparatus based on voltage source type current converter and ice melting method thereof

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Embodiment

[0025] 1) Melting ice mode

[0026] In ice melting mode, the circuit topology is as follows figure 1 As shown, one side of the four groups of identical transformers 1-4 is connected to the AC system bus I 21, and the other side is connected to the bus II 22 of the ice-melting device to provide ice-melting power for the ice-melting device. Four groups of identical AC filters 5-8 are passed through four groups of switches S 1 -S 4 The same transformers 1-4 as the four groups are connected in parallel to the bus II22 to filter out the characteristic harmonics on the AC side of the system. Four groups of identical reactors 9-12 head ends pass through four groups of switches S 5 -S 8 It is connected in parallel to the busbar II 22, and the tail ends are respectively connected to the bridge arms of the voltage source type converter bridge 13-16. It is the link of energy exchange between the converter bridge and the AC side, and also plays a role in suppressing the rising speed o...

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Abstract

The invention discloses a bifunctional direct current ice melting apparatus based on a voltage source type current converter and an ice melting method thereof. The direct current ice melting apparatus is characterized in that: the apparatus is in a bifunctional working mode. More particularly, in an ice-melting mode, the apparatus is in a rectification working state and can provide enough direct currents to carry out ice melting on an icing line; and in a non-ice melting mode, a corresponded switch switching and controlling strategy is utilized, so that the apparatus is in an inversion working state and is used as a static synchronous compensator (STATCOM) for operation; and thus, system reactive compensation is realized. Compared with a current source type ice melting apparatus, the provided novel apparatus enables an ice melting power to be increased, reactive power consumption to be reduced and harmonic output to be optimized; besides, the main characteristic of the apparatus is as follows: a dual mode working performance is designed; that is, energy-saving economic objectives of three-phase uniform ice melting and ice melting current minimization can be achieved in minimum ice melting time under an ice melting mode.

Description

technical field [0001] The invention relates to a dual-function DC deicing device based on a voltage source type converter and a deicing method thereof, belonging to the field of long-distance AC and DC power transmission. Background technique [0002] The icing of transmission lines in winter is one of the major natural disasters of the power system. Severe icing will lead to a sharp decline in the mechanical and electrical performance of transmission lines, causing power supply interruptions, and even serious accidents such as grid disconnection, and the repair work is difficult and takes a long time. ,big influence. Therefore, it is of great significance to strengthen the research on the ice melting technology of transmission lines to improve the stability of the power system and promote the development of the national economy. [0003] At present, the deicing methods of transmission lines at home and abroad can be divided into AC deicing method and DC deicing method. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G7/16H02M7/797H02J3/18
CPCY02E40/16Y02E40/10
Inventor 李兴源刘天琪王渝红魏巍赵国帅李思思项英桐戴寒光
Owner SICHUAN UNIV
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