A Series Type Power Flow Controller Suitable for DC Transmission
A power flow controller and DC transmission technology, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve problems such as increased line loss, inability to accurately control the size of the power flow, and inability to realize the interconnection function of DC lines of different voltage levels.
Active Publication Date: 2016-04-20
STATE GRID CORP OF CHINA +2
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Problems solved by technology
[0007] At present, in DC transmission projects, the power level has developed from the initial 3MW to the current 1100MW, and the voltage level has developed from ±10kV to the current ±500kV; Voltage level DC line interconnection and intercommunication function
Therefore, in the DC power grid, the proportional relationship of the power flow in the parallel line is mainly changed by changing the resistance value of the series resistor to change the proportional relationship of the power flow in the transmission line. However, this method increases the line loss, and the power flow in the series line cannot be adjusted Disadvantages such as precise control
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[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0041] Such as figure 1 The series-type power flow controller suitable for direct current transmission in this embodiment shown includes a bidirectional DC / DC converter and an H-bridge converter; the output end of the bidirectional DC / DC converter is connected to the high-voltage direct current transmission network through a DC circuit breaker; One output branch of the H-bridge converter is sequentially connected to the high-voltage direct current transmission network through a reactor and a direct current fuse, and the other out...
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The invention provides a series type tidal current controller suitable for direct current power transmission. The controller comprises a bi-directional DC / DC converter and an H bridge converter connected with the bi-directional DC / DC converter in series. The bi-directional DC / DC converter is connected into a high-voltage direct current power transmission network through direct current breakers, one output branch circuit of the H bridge converter is sequentially connected into the high-voltage direct current power transmission network through a reactor and a direct current fuse protector, and the other output branch circuit of the H bridge converter is directly connected into the high-voltage direct current power transmission network. Compared with the prior art, the series type tidal current controller suitable for the direct current power transmission can control fixed voltage connected inside a direct current transmission line in series in a linear mode when operating in a voltage mode and control the tidal current direction and magnitude of a series line when operating in a current mode, and then the distribution relation of tidal currents in a parallel line is controlled.
Description
technical field [0001] The invention relates to a power flow controller, in particular to a serial type power flow controller suitable for direct current transmission. Background technique [0002] Compared with traditional high-voltage AC transmission technology, high-voltage direct current transmission has the advantages of low reactive power loss, low line loss and no synchronization problems, and is very suitable for ultra-long-distance large-capacity power transmission. However, the traditional point-to-point HVDC transmission technology cannot adapt to the geographically dispersed characteristics of photovoltaic and wind power plants, nor can it adapt to the requirements of multi-terminal placement of the receiving-end power grid. [0003] In the prior art, in order to solve the problem of insufficient traditional two-terminal direct current transmission, the multi-terminal direct current transmission technology is mainly used to realize the power generation of multipl...
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IPC IPC(8): H02J1/00
Inventor 曹远志姚良忠吴福保杨波卢俊峰陶以彬王德顺周晨刘欢鄢盛驰王志冰孙蔚许晓慧胡金杭崔红芬冯鑫振朱红保
Owner STATE GRID CORP OF CHINA