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High voltage DC power flow controller

A power flow controller and high-voltage direct current technology, which is applied in the direction of converting irreversible DC power input into AC power output, and AC networks with the same frequency from different sources, can solve the problems of high equipment engineering cost, high insulation level of the whole machine, The problem of large loss of the whole machine is achieved, and the effect of simple structure, high operating efficiency and strong fault handling ability is achieved.

Active Publication Date: 2017-08-11
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0007] 1) The voltage on the input side of the power flow controller is too high, which leads to a high insulation level of the whole machine, which makes the engineering cost of the equipment too high;
[0008] 2) The DC / DC conversion unit of the power flow controller uses a cascaded topology of multi-level converters, and the efficiency of each converter will affect the overall efficiency of the whole machine, which eventually causes excessive loss of the whole machine;
[0009] 3) The DC / DC conversion unit of the power flow controller adopts the structure of bidirectional DC / DC converter cascaded H-bridge units, which makes the structure of the DC / DC conversion unit complicated, and also increases the complexity of debugging and installation

Method used

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Embodiment 1

[0031] The invention of this example provides a high-voltage DC power flow controller, whose cascaded multilevel converter unit can provide a lower DC input voltage for the subsequent DC / DC converter. In addition, the high-voltage DC power flow controller has fault handling Strong ability and high operating efficiency.

[0032] The topological structure of the controller of the present invention is as attached figure 1 shown. It can be seen from the figure that the controller of the present invention has bipolar characteristics and can be applied to a true bipolar HVDC power transmission system. Bipolar characteristics, that is, the whole system includes two sets of modular multilevel converters (MMC), and the outputs of one end of the two sets of converters are grounded in series to form a neutral point, and the other two output ends are connected to the positive and negative poles of the DC grid. Since the structure of the positive and negative poles of the converter is sy...

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Abstract

The invention relates to a high voltage DC power flow controller comprising two sets of modular multilevel converters. The two sets of modular multilevel converters are connected in series, and one end is accessed to the positive electrode and the negative electrode of a DC power grid and the other end is interconnected and grounded so as to form a neutral point. According to the technical scheme, an external power supply does not need to be connected so that the structure is simple, the fault processing capacity is high and the operation efficiency is high.

Description

[0001] Technical field: [0002] The invention relates to the technical field of direct current transmission power electronics, and more specifically relates to a high-voltage direct current flow controller. [0003] Background technique: [0004] With the gradual intensification of traditional energy shortages and environmental pressures, people have realized the urgency and importance of transitioning from traditional energy to clean energy. In recent years, new energy power generation technologies represented by wind energy and solar energy have developed rapidly. However, due to the intermittency and instability of new energy, traditional technologies that accept ultra-large-scale new energy are receiving more and more attention. Therefore, new technologies, equipment and optimized grid structure must be adopted to meet the profound changes in the future energy pattern. Compared with the traditional high-voltage AC transmission technology, UHV and flexible DC transmission ...

Claims

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Application Information

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IPC IPC(8): H02J3/06H02M7/49
CPCH02J3/06H02M7/49
Inventor 杨波姚良忠丁杰曹远志庄俊崔红芬李琰王志冰卢俊锋王伟胜迟永宁陶以彬李官军胡金杭桑丙玉周晨余豪杰冯鑫振刘欢鄢盛驰侯书毅李跃龙朱红保马鑫鑫薛金花陶琼
Owner CHINA ELECTRIC POWER RES INST
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