Power supply system for direct-current remote-power-supply alternating current local side terminal on expressway and method

Abstract

The invention discloses a power supply system for a direct-current remote-power-supply alternating current local side terminal on an expressway and a method. The method comprises the following steps: dividing an area to be supplied with power on the expressway into a plurality of power supply units according to a preset distance; arranging at least one alternating current local side terminal in each of the power supply units, wherein the alternating current local side terminal comprises a voltage converting module with an alternating current input end and a direct current output end; the alternating current input end is connected with an alternating current power frequency or an intermediate frequency voltage power supply; at least one direct current voltage is outputted from the direct current output end; all the remote terminals on all the loading positions to be supplied with power in the power supply units are successively connected with each other through transmission cables, started from the alternating current local side terminal; the remote terminals are used for converting the received direct current voltage into the voltages required by load and supplying the load with power. The power supply system provided by the invention has the beneficial effects that the operation maintenance cost is lower than the cost of other power supply mode, and principally, the maintenance is not required if the power supply is not damaged.

Description

technical field [0001] The invention relates to the technical field of communication and power transmission, in particular to a power supply system and method applied to an AC local terminal machine of a DC remote power supply source on a highway. Background technique [0002] In the past ten years, with the rapid development of my country's expressway construction, my country's expressway mileage has become the world's first, reaching more than 100,000 kilometers. At present, the power supply mode for electrical equipment on expressways (mainly including: cameras, LED street lights, LED information boards, fill lights, optical transceivers, etc.) is strip-shaped power supply, the power supply distance is long, the load is small and scattered, and it is difficult to obtain communication Mains power supply. Its substations are generally set up in management centers, toll stations, service areas or maintenance work areas, with limited power supply distance and extremely poor ...

AI Technical Summary

Problems solved by technology

However, it is difficult or impossible to supply power to electrical equipment that is far away from the substation, such as within 4-30 kilometers.

[0003] In addition, no matter whether the AC power supply adopts high-voltage power supply or low-voltage power supply, there are the following disadvantages: First, a large number of high-voltage and low-voltage cables are required, so the project cost is high with the increase in the price of raw materials; Long power supply lines are prone to lightning strikes and large transmission loss; third, the highway is located in the wild, and the high and low voltage cables are on both sides of the highway, which is easy to be stolen. For this reason, it is necessary to install a cable anti-theft system, etc.

[0009] Third, limitations of applicable fields and conditions: In the communication industry, only the DC48V low voltage of the communication professional computer room battery can be converted into DC high voltage DC220-380V and sent to the load through the transmission line

[0013] 2. Only "one point to one point" DC remote supply can be carried out, that is, one DC remote power supply local end machine only drags one remote end machine; it is impossible to realize one local end machine dragging multiple remote end machines to serve multiple loads The situation of power supply

[0014] 3. It can only output DC high voltage of DC220-380V, but cannot output DC400V, especially DC800V high voltage.

However, the high-voltage transmission loss of DC800V is 50% lower than that of DC380V, and the cost of line construction is also reduced by 40-50%, which cannot reflect the energy-saving effect.

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