Double-end power supply structure applicable to low-voltage distribution network with direct current microgrid access

Abstract

The invention discloses a double-end power supply structure applicable to a low-voltage distribution network with direct current microgrid access. A first power distribution cabinet and a second power distribution cabinet are connected through a dual-power-supply automatic transfer switch (ATS); the low-voltage buses of the first low-voltage power distribution cabinet and the second low-voltage power distribution cabinet are connected through a soft normally open point (SNOP); a direct current microgrid is connected through the direct current side of the SNOP; and the SNOP is connected with the dual-power-supply ATS in parallel. By adoption of the double-end power supply structure, the following technical problems can be solved: the low-voltage parallel power supply system comprising the direct current microgrid in the prior art is instable in alternating current system frequency and has reactive power-caused loss; the power supply may suffer from a reverse-power operating condition caused by influences from values of a power supply voltage, phase, equivalent impedance, an impedance angle, a load, a power factor and the like; and furthermore, the service life and the like of the ATS are influenced by deformation of a mechanical switch contact due to frequent switching of the conventional ATS.

Description

technical field [0001] The invention belongs to the power supply technology, and in particular relates to a double-terminal power supply structure suitable for a low-voltage distribution network connected to a DC microgrid. Background technique [0002] Compared with the AC microgrid, the DC microgrid can more efficiently accommodate distributed renewable energy generation systems such as wind and light, energy storage units, electric vehicles and other DC loads. The DC microgrid is an important part of the future intelligent power distribution system. It can promote energy conservation and emission reduction to achieve sustainable energy development. Most of the electricity generated by photovoltaics, fans, fuel cells, and energy storage units in the microgrid is direct current or non-power frequency alternating current; commonly used mobile phones, computers, LED lights, inverter air conditioners, and electric vehicles are all driven by direct current. The AC power grid r...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a double-terminal power supply structure suitable for low-voltage distribution network with DC micro-grid access, so as to solve the unstable frequency of AC system in the low-voltage parallel power supply system including DC micro-grid in the prior art , the loss caused by reactive power, the power supply is affected by many factors such as the size and phase of the power supply voltage, the size of the equivalent impedance and the impedance angle, the size of the load and the power factor, etc., and the situation of reverse power operation may occur, and the traditional ATS switches frequently, which will Causes deformation of mechanical switch contacts and affects the service life of ATS

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