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Fault ride-through method and device for passive sending system in flexible DC power grid

A DC power grid and power grid technology, applied in the direction of circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems that restrict the application of flexible DC and flexible DC grids, and achieve coverage The effect of wide range, convenient and flexible use, and low cost

Pending Publication Date: 2019-05-24
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

However, the economics of installing energy-consuming devices seriously restricts the application of flexible DC and flexible DC grids in new energy passive transmission scenarios

Method used

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  • Fault ride-through method and device for passive sending system in flexible DC power grid
  • Fault ride-through method and device for passive sending system in flexible DC power grid
  • Fault ride-through method and device for passive sending system in flexible DC power grid

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Embodiment Construction

[0044] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] The present invention aims at the problem that the entire passive sending end converter station or the entire DC power grid is blocked due to the inability to realize the AC and DC fault...

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Abstract

The invention relates to a fault ride-through method and device for a passive sending system in a flexible DC power grid. The method includes the following steps: putting a bidirectional thyristor switch into operation according to the operation status information of a new energy power generation passive sender converter station or a flexible DC power grid to connect a PCC point on the AC side ofthe new energy power generation passive sender converter station with the ground, and making a safety and stability control device remove the generation power of a new energy power generation passivesender; and making the bidirectional thyristor switch disconnect the PCC point on the AC side of the new energy power generation passive sender converter station from the ground. According to the technical scheme provided by the invention, a control method based on coordination among the parallel thyristor switch, the safety and stability control device and the passive AC power grid protection ispresented, which can limit the active power flowing into the passive sender converter station in the process of disturbance accidents in a flexible DC power grid passive sender converter station, a receiver converter station and a receiver AC power grid and realize safe and efficient ride-through of the faults by the flexible DC power grid.

Description

technical field [0001] The invention relates to the field of home appliance control, in particular to a method and device for fault ride-through of a passive transmission system of a flexible DC power grid. Background technique [0002] The increasing depletion of fossil energy urgently requires strategic adjustment of energy structure in China and the world. The use of large-scale new energy power generation to deeply replace fossil energy is the fundamental way of energy transformation, and it is also an important feature of the new generation power system. [0003] At present, there are mainly three networking methods for wind power grid-connected: AC transmission, conventional DC transmission and flexible DC transmission. AC grid connection has the advantage of low cost in short-distance power transmission. However, when the system fails, it will directly affect the stable operation of the wind farm. Conventional DC power transmission technology converter stations occu...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02H9/04
CPCY02E60/60
Inventor 赵兵王姗姗王铁柱马士聪卜广全郭剑波李英彪吴广禄
Owner CHINA ELECTRIC POWER RES INST
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