Step-down self-energy-harvesting circuit and method for medium-high-voltage direct-current power distribution network
A DC distribution network, medium and high voltage technology, applied in the direction of DC power input conversion to DC power output, electrical components, adjustment of electrical variables, etc. question
Active Publication Date: 2019-11-22
JIANGSU ELECTRIC POWER CO +3
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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 i
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[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.
[0033] An embodiment of the present invention provides a step-down self-energy harvesting circuit for a medium-high voltage direct current distribution network. figure 1 It is a structural schematic diagram of a step-down self-energy harvesting circuit of a medium-high voltage DC distribution network provided by an embodiment of the present invention. see figure 1 , the step-down self-energy harvesting circuit of the medium and high voltage DC distribution network provided by the embodiment of the present inventi...
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The embodiment of the invention discloses a step-down self-energy-harvesting circuit and method for a medium-high-voltage direct-current power distribution network. The circuit comprises N half-bridgemodules and a full-bridge module, wherein the N is an integer greater than or equal to 3; each half-bridge module comprises a positive terminal and a negative terminal; the full-bridge module comprises a positive terminal and a negative terminal; for the first to (N-1)th half-bridge modules, the positive terminal of the first half-bridge module is connected with the positive electrode of the direct-current power distribution network, the negative terminal of each previous half-bridge module is electrically connected with the positive terminal of the next half-bridge module, the negative terminal of the (N-1)th half-bridge module is electrically connected with the positive terminal of the full-bridge module, the negative terminal of the full-bridge module is electrically connected with thepositive terminal of the Nth half-bridge module, and the negative terminal of the Nth half-bridge module is connected with the negative electrode of the DC power distribution network. The circuit andthe method solve the problem of secondary loop power supply of a medium-high voltage direct current system, and reduce the dependence of a direct current distribution network on an 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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CPCH02M3/155H02M1/0067
Inventor 史明明袁宇波袁栋袁晓冬朱卫平陈庆费益军杨景刚陶加贵
Owner JIANGSU ELECTRIC POWER CO