Flexible power flow and short-circuit current hybrid control device and method

A short-circuit current and hybrid control technology, applied in the field of compensators, can solve problems such as weak capacity and price advantages, and cannot meet precise and fast adjustments, and achieve the effects of reducing capacity, improving equipment reliability, and reducing costs

Pending Publication Date: 2020-12-18
STATE GRID ZHEJIANG ELECTRIC POWER CO LTD SHAOXING POWER SUPPLY CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the compensator with series compensation and phase shift control functions using voltage source converters, it can optimize the regulation of system power flow, but its capacity and price advantages are weak
Traditional reactors can be used as line series compensation to limit fault current, but cannot meet the requirements of precise and fast adjustment

Method used

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  • Flexible power flow and short-circuit current hybrid control device and method
  • Flexible power flow and short-circuit current hybrid control device and method
  • Flexible power flow and short-circuit current hybrid control device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A hybrid control device for flexible power flow and short-circuit current, such as figure 1 As shown, it includes a voltage source converter, a series transformer, a reactor unit, a first switch and a second switch, and the reactor unit is connected in parallel with the first switch to form a first compensation unit, wherein the reactor unit includes a reactor or consists of At least two reactors are connected in series; the series transformer is a three-phase transformer, including at least two windings, the first winding is connected to the AC side interface of the voltage source converter to form a second compensation unit, the second winding is connected to the second One compensation unit is connected in series, the first compensation unit is connected in series with the second compensation unit to form a third compensation unit, and the third compensation unit is connected in parallel with the second switch to form the flexible power flow and short circuit current ...

Embodiment 2

[0043] Such as figure 2 As shown, on the basis of Embodiment 1, the flexible power flow and short-circuit current hybrid control device further includes a third switch, which is connected in parallel with the second side winding of the series transformer, that is, the third switch is connected in parallel with the second compensation unit. When the second compensation unit fails, the second compensation unit can be bypassed by connecting the first compensation unit and the line through the third switch.

[0044] Further, if an isolating device is included between the third switch and the second compensation unit, when the third switch is switched on, the third switch can be isolated from the second compensation unit through the isolating device, that is, the second compensation unit Implement maintenance.

Embodiment 3

[0046] Such as image 3As shown, the flexible power flow and short-circuit current hybrid control device also includes a DC voltage converter. The first side of the DC voltage converter is connected to the DC side interface of the aforementioned voltage source converter, and the second side of the DC voltage converter is connected to the energy storage unit.

[0047] When the second compensation unit is put into operation, the energy storage unit realizes active energy exchange with the second compensation unit through the DC voltage converter, which can ensure the stability of the DC voltage of the voltage converter of the second compensation unit, thereby realizing the flexible Independent compensation of real and real power injected into the line by the flow and short-circuit current mixing control device. The voltage of the energy storage unit can be reduced through the DC voltage converter, thereby saving the cost of the energy storage unit.

[0048] Wherein, the energy...

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PUM

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Abstract

The invention discloses a flexible power flow and short-circuit current hybrid control device and method. The device comprises a voltage source converter, a series transformer, a reactor unit, a firstswitch, and a second switch, and the reactor unit comprises a reactor or is formed by the series connection of at least two reactors. The reactor unit and the first switch are connected in parallel to form a first compensation unit; the series transformer comprises at least two side windings, and the first side winding is connected with an alternating current side interface of the voltage sourceconverter to form a second compensation unit; the second side winding is connected in series with the first compensation unit; the first compensation unit and the second compensation unit are connected in series to form a third compensation unit; the third compensation unit is connected with the second switch in parallel; and two ends of the third compensation unit are connected with a power transmission line. According to the invention, the capacity of the voltage converter can be reduced, the cost is reduced, the current limiting capability is achieved, and the equipment reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics in power systems, and in particular relates to a compensator. Background technique [0002] With the rapid development of the power system, as the load continues to grow, the grid structure becomes more and more complex, and new energy sources are connected on a large scale, problems such as uneven distribution of power flow, insufficient voltage support capacity, excessive short-circuit current, and electromechanical oscillation are often intertwined, which poses a threat to the operation of the power grid. Control brings new challenges. Increasing transmission capacity by building new transmission lines will become increasingly difficult due to the saturation of transmission corridors and the commercialization of grid companies. FACTS refers to an AC transmission system that uses power electronics and other static controllers to improve system controllability and power delivery capabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02H9/02
CPCH02H9/021H02J3/1807H02J3/1842Y02E40/30
Inventor 项中明杨才明叶琳徐奇锋倪秋龙谢栋杨滢张静周正阳潘武略罗刚华文祁炜雯宋美雅王书培俞佳莫莉晖唐志琼潘磊付俊波
Owner STATE GRID ZHEJIANG ELECTRIC POWER CO LTD SHAOXING POWER SUPPLY CO
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