A multifunctional and intensive DC ice melting device
A DC ice-melting, multi-functional technology, applied in the direction of circuit devices, harmonic reduction devices, overhead installations, etc., can solve the problems of large capacity, poor economy, high cost of converters, and achieve small capacity, reduce device cost, The effect of improving economy
Active Publication Date: 2021-03-09
STATE GRID HUNAN ELECTRIC POWER +2
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Problems solved by technology
However, in this way, the AC side current and DC current will flow through each phase bridge arm of the commutation chain at the same time, and the output voltage of the bridge arm also includes the grid phase voltage and DC output voltage, resulting in the capacity of the converter being much larger than that of the fuse. Ice output capacity, according to analysis and calculation, the converter capacity is at least 2.9 times of the ice melting output capacity, that is, the capacity utilization rate of the SVG converter is only close to 1 / 3, resulting in large converter capacity, high cost, and poor economy
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Embodiment 1
[0026] This embodiment discloses a multi-functional intensive DC ice-melting device, such as figure 1 shown, including:
[0027] Three-phase filter reactance 1, static voltage generator 2, short-circuit switch 3, three-phase uncontrolled rectifier 4; among them, one end of the static voltage generator is connected to the power grid through the filter reactance, and the other end is connected to the AC input of the three-phase uncontrolled rectifier side; the short-circuit switch is connected in parallel between the three phases on the AC input side of the three-phase uncontrolled rectifier; when the ice needs to be melted, the short-circuit switch is disconnected to control the output voltage of the static voltage generator to continuously adjust the three-phase uncontrolled rectifier AC input voltage, and then control the output voltage and current for ice melting; when ice melting is not needed, close the ice melting switch to make the static voltage generator operate as SVG...
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The invention discloses a multifunctional intensive direct current ice-melting device to improve the utilization rate of the device and the comprehensive cost performance. The invention includes a three-phase filter reactance, a static voltage generator, a short circuit switch and a three-phase uncontrolled rectifier. One end of the static voltage generator is connected to the power grid through a filter reactance, and the other end is connected to the AC input side of the three-phase uncontrolled rectifier; the short-circuit switch is connected in parallel between the three phases on the AC input side of the three-phase uncontrolled rectifier. When it is necessary to melt the ice, open the short circuit switch, control the output voltage of the static voltage generator to continuously adjust the AC input voltage of the three-phase uncontrolled rectifier, and then control the output voltage and current of the ice melting; when it is not necessary to melt the ice, close the melting Ice switch to make static voltage generator run as SVG. In the present invention, the low-cost uncontrolled rectifier and the SVG with good technical indicators are complementary combined, so that the overall function of the direct current ice-melting device is multiple, the cost is moderate, and the overall cost performance is high.
Description
technical field [0001] The invention relates to the technical field of ice melting, in particular to a multifunctional intensive direct current ice melting device. Background technique [0002] Ice and snow disasters occur frequently in my country, and the ice-covered power transmission lines are likely to cause disconnection and downturning, which seriously threatens the safe operation of the power grid and the reliability of power supply. For this reason, various types of DC ice-melting devices have been developed at home and abroad, which provide technical means for the power grid to resist disasters. According to the structural principles, the existing direct current ice melting devices can be divided into three categories: [0003] The first type is a diode-based uncontrolled rectification DC ice-melting device, such as the Chinese invention patent CN200810031940.1 published on May 20, 2009. This type of device has a simple structure and low cost; however, the output ...
Claims
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IPC IPC(8): H02G7/16H02J3/18H02J3/01
CPCH02G7/16H02J3/01H02J3/1821Y02E40/10Y02E40/40
Inventor 陆佳政黄清军李波谭艳军毛新果朱思国朱远
Owner STATE GRID HUNAN ELECTRIC POWER