Power conversion system for long-distance and multi-interval equipment power supply and distribution

Abstract

The invention provides a power conversion system for long-distance and multi-interval equipment power supply and distribution, and is applicable to occasions like highway equipment, long-distance lighting and defense monitoring. The system is mainly composed of a piece of source power supply conversion equipment and a piece of remote power distribution conversion equipment. The source power supply conversion equipment includes a source power supply converter and a source boosting conversion device. The source power supply converter is used for converting three-phase mains power into single-phase 50Hz alternating-current power. The source boosting conversion device is used for boosting the output voltage of the power supply converter to 700-1000V / ac and transmitting electric energy to a remote equipment side under the voltage. The remote power distribution conversion equipment includes a remote bucking conversion device and a remote precise voltage stabilization converter. The bucking conversion device converts the high voltage of a main line to a voltage input range which can be borne by a power distribution converter, and then, through conversion by the remote precise voltage stabilization converter, precise 220V and 50Hz alternating-current power is output for remote electrical equipment to use.

Description

technical field [0001] The invention relates to the fields of power electronic conversion and power supply and distribution, in particular to a power conversion system suitable for power supply and distribution of long-distance and multi-interval equipment. Background technique [0002] With the transformation of infrastructure such as highways, it is necessary to expand the capacity of the original electrical equipment or add new high-power electrical equipment, for example, to add monitoring equipment or road signs at regular intervals. At present, the power supply and distribution schemes applied to long-distance power consumption equipment mainly include: [0003] (1) Nearby power distribution, that is: take power from the place closest to the electrical equipment, and the voltage level is 220V. [0004] (2) Power distribution from the source side, that is: firstly, the mains power is boosted and converted into high-voltage power, and after being transmitted to the su...

AI Technical Summary

Problems solved by technology

[0007] The (1) power supply and distribution method is the simplest. It takes power directly from the nearby places of the electrical equipment, thus eliminating the need for power conversion. However, its shortcoming is that the power distribution distance is limited. Due to the influence of voltage drop, the voltage level reaching the equipment end may not meet the requirements of the electrical equipment

At the same time, this method is easy to cause the cable to be stolen

[0008] The (2) power supply and distribution method can distribute electric energy to a long distance by boosting the voltage at the source end. At the same time, passive equipment is used for energy conversion, so the operation is stable, but its problem is that it uses a voltage stabilizer to stabilize the power supply. The voltage is easily affected by the power grid, and at the same time, the load capacity is weak, and when it supplies power to kilowatt-level electrical equipment, it will generate serious heat

[0009] (3) The constant current form of power distribution can control the transmission loss on the cable to keep constant, but under the condition of high power operation, the control method is complicated and the system stability is not high

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