A step-down self-energy harvesting circuit and method for a medium-high voltage direct current distribution network

Abstract

The embodiment of the invention discloses a step-down self-energy harvesting circuit and method for a medium-high voltage direct current distribution network. The step-down self-energy harvesting circuit of the medium and high voltage DC distribution network includes N half-bridge modules and a full-bridge module, N is an integer greater than or equal to 3, the half-bridge module includes positive and negative terminals, and the full-bridge module includes positive and negative terminals. Negative terminal, for the 1st to (N‑1)th half-bridge modules, the positive terminal of the first half-bridge module is connected to the positive pole of the DC power distribution network, and the negative terminal of the previous half-bridge module is connected to the next half-bridge module The positive terminal of the (N‑1)th half-bridge module is electrically connected to the positive terminal of the full-bridge module, and the negative terminal of the full-bridge module is electrically connected to the positive terminal of the Nth half-bridge module. The negative terminal of each half-bridge module is connected to the negative pole of the DC distribution network. The technical solution of the embodiment of the present invention solves the secondary circuit power supply problem of the medium and high voltage direct current system, and reduces the dependence of the direct current distribution network on the alternating current system.

Description

technical field [0001] Embodiments of the present invention relate to the field of direct current distribution networks, and in particular to a step-down self-energy harvesting circuit and method for medium and high voltage direct current distribution networks. Background technique [0002] The current research on DC power distribution equipment has become a new hot spot in the field of electrical equipment. In the AC power grid, most of the power supply for the secondary circuit of high-voltage equipment comes from 220V low-voltage AC or UPS (Uninterruptible Power System, uninterruptible power system) circuit. This power supply scheme has natural advantages in the AC system and can use voltage transformers The secondary side of the (PT) takes energy and supplies power to the secondary control board. [0003] However, in the medium and high voltage DC power grid, the secondary circuit energy harvesting through AC 220V is not of practical value, which increases the dependenc...

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Problems solved by technology

[0003] However, in the medium and high voltage DC power grid, the secondary circuit energy harvesting through AC 220V is not of practical value, which increases the dependence of the construction of the DC distribution network on AC power.

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