Ice-melting mode and apparatus for mobile DC power supply
A DC power supply, mobile technology, applied in cable installation, electrical components, overhead installation, etc., can solve the problems of voltage and current waveform distortion, lost pulse, system overvoltage, etc. in the power supply system, improve power factor, and facilitate lifting , the effect of saving investment
Active Publication Date: 2013-10-23
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology
Thyristor rectification is a typical circuit that generates harmonics, but the harmonics generated during its operation have the following effects: First, the harmonics distort the voltage and current waveforms of the power system, resulting in overheating of generators and power distribution equipment and increased losses 1. System overvoltage; second, harmonics increase the reactive power of the power system and decrease the power factor, which restricts the effective use of power capacity; third, harmonics can cause semiconductor devices to produce false triggers, lost pulses, and other out-of-control phenomena
Secondly, the original DC ice melting device is a screen cabinet, which has no function of protection against rain and snow, and it is inconvenient to load and transport
Method used
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[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0018] From attached figure 1 It can be seen that the present invention is a mobile DC power supply deicing method and device. The DC power supply deicing method uses a set of DC power supplies composed of two motor vehicles respectively carrying generator sets and a controllable rectification system. Melt the ice on the line. The generator set is used when the substation has no electricity, and is powered by the substation when all electricity is transformed. The power provided by the generator set or substation is sent to the controllable rectification system, and then the controllable rectification system sends the rectified DC power through the ice melting switch to the line that needs to be melted for DC ice melting. Moreover, the controllable rectification system is a controllable rectification system with a harmonic reactive power compensation ...
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The invention provides a mobile DC power ice-melting method and a device thereof. The method and the device are characterized in that ice-melting treatment is carried out to line icing through a set of movable DC power supply; the movable DC power supply bears a generating set and a controllable rectification system through two motor vehicles respectively; and power is generated through the generating set, rectified through the controllable rectification system and then supplied to lines as DC ice-melting power; the controllable rectification system is provided with a harmonic reactive compensation system; the DC power supply is subjected to harmonic treatment through the harmonic reactive compensation system and then provides the DC power; a controllable rectifier changes the power supplied by the generating set or a substation into the DC power and then supplies the DC power to input lines; the harmonic reactive compensation system sends synchronizing signals into a rectifier control system; and the rectifier control system carries out rectifying harmonic treatment to the controllable rectifier.
Description
technical field [0001] The invention relates to an auxiliary power supply method and device in an electric power transmission system, in particular to a mobile DC power supply ice-melting power supply method and device, which is mainly used for ice-melting treatment of ice-covered lines when existing lines are covered with ice. technical background [0002] In subtropical regions, winter and spring are cloudy and rainy, and the climate and geographical conditions are prone to icing of overhead lines, which poses a great threat to the safe operation of power systems. It mainly causes ice flash or mechanical damage to the transmission line, which in turn affects the safe and stable operation of the power grid. In extreme weather, it even leads to the collapse of the power grid, which has a serious impact on people's production and life. [0003] In order to overcome the threat to the safe operation of the power system caused by the icing of the existing lines, there are many w...
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IPC IPC(8): H02G7/16H02J3/18
CPCY02E40/30
Inventor 黎小林许树楷傅闯严树钢唐亚军周细文王小方
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD