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DC transformer for access of new energy to DC power grid, and implementation method for DC transformer

A DC transformer and DC power grid technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, instruments, etc., can solve the problems of power device loss, high economic cost, lack of electrical isolation function, etc., to prevent faults Diffusion, good harmonic characteristics, effect of achieving fault current tolerance

Inactive Publication Date: 2017-06-23
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
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Problems solved by technology

[0008] At present, universities and research institutions at home and abroad have done some research on DC transformers. Among them, AlonsoAR et al. proposed a double-sided active DC / DC converter, which requires IGBT bridge arms to withstand all voltages in high-voltage direct current transmission. The problem of device voltage equalization, which needs to be connected in series or in parallel when applied to high voltage and high power; Jovcic D et al. proposed a resonant DC / DC converter, which needs IGBT bridge arms to bear all Voltage and lack of electrical isolation function, Kish G J et al. proposed a DC / DC converter based on MMC technology topology, which has problems such as power device loss, low converter efficiency, and high economic cost

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  • DC transformer for access of new energy to DC power grid, and implementation method for DC transformer
  • DC transformer for access of new energy to DC power grid, and implementation method for DC transformer
  • DC transformer for access of new energy to DC power grid, and implementation method for DC transformer

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Embodiment Construction

[0036] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. These embodiments of the present invention may be referred to herein, individually or collectively, by the term "invention", which is for convenience only and is not...

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Abstract

The invention relates to a DC transformer for the access of new energy to a DC power grid, and an implementation method for the DC transformer. The DC transformer employs an isolation-type DC / DC converter mode, and is characterized in that the DC transformer comprises a low-voltage side full-bridge converter and a high-voltage side modular multi-level converter; the low-voltage side single-phase full-bridge converter and the high-voltage side single-phase modular multi-level converter are connected through a high-frequency transformer. The DC transformer provided by the invention can achieve the interconnection of a new energy DC power generation station with the low voltage level and a DC power grid with the high voltage level. The low-voltage side single-phase full-bridge converter is used for connecting the new energy DC power generation station with the low voltage level. The high-voltage side single-phase modular multi-level converter is used for connecting the DC power grid with the high voltage level.

Description

technical field [0001] The invention relates to a DC transformer and its implementation method, in particular to a DC transformer for connecting new energy sources to a DC grid and its implementation method. Background technique [0002] With the escalation of many problems such as global environmental pollution, energy shortage, and manufacturing technology upgrades, the scale and capacity of new energy power generation represented by wind power and solar power generation continue to increase. The issue of energy and power delivery is particularly important. Compared with AC transmission, HVDC transmission technology has the advantages of large transmission capacity, long transmission distance and low loss, so it has been widely used in my country's power grid. From the perspective of power transmission, the traditional power system is difficult to meet the requirements of improving the quality of power supply for users and transmitting power over long distances. From the...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33553H02M1/0077
Inventor 庄俊姚良忠杨波曹远志丁杰吴福保迟永宁陶以彬许晓慧李琰孙蔚李官军王志冰崔红芬卢俊峰周晨余豪杰刘欢鄢盛驰胡金杭冯鑫振李跃龙朱红保侯书毅
Owner CHINA ELECTRIC POWER RES INST
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