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Superconducting energy storage control method for improving transient power angle stability of fan-containing system

A technology of transient power angle stabilization and transient power angle, applied in the usage of superconductor elements, flexible AC transmission system, reducing/preventing power oscillation, etc., can solve the impact of lack of transient stability, without considering SMES reactive power Issues such as the relationship between the influence of transient power angle stability on the output characteristic system

Active Publication Date: 2020-06-16
TIANJIN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In terms of system transient power angle stability, only the active power compensation characteristics of SMES are used, without considering the influence of SMES' reactive power output characteristics and access location on system transient power angle stability
There are few studies on improving the transient power angle stability of the system by interconnecting SMES-DFIG, and they are all based on a single-machine infinite system, lacking a theoretical analysis of the impact of DFIG-SMES connection on system transient stability from the original multi-machine system

Method used

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  • Superconducting energy storage control method for improving transient power angle stability of fan-containing system
  • Superconducting energy storage control method for improving transient power angle stability of fan-containing system
  • Superconducting energy storage control method for improving transient power angle stability of fan-containing system

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Embodiment

[0122] The topology diagram of a three-machine system with DFIG-SMES is as follows image 3 shown. Among them, the rated capacities of synchronous machines SG1, SG2 and SG3 are 247.5MW, 192MW and 128MW respectively; DFIG and SMES are connected in parallel at node 7, and the rated power of DFIG is 75MW; a three-phase symmetrical fault is set at node 8, and the fault lasts from 0.3s to 0.6s. In this example, SG2 and SG3 belong to the leading group S, and SG1 belongs to the remaining group A. DFIG adopts the rotor crowbar crossing scheme, and the resistance of the crowbar is 0.1 ohm. It will be put into operation when the voltage drop is detected on the stator side, and it will exit when the fault ends. In order to verify the effectiveness of this scheme, the simulation comparison analysis of SMES controlled by this scheme, SMES controlled by power angle increase and decrease, and no SMES was carried out under the same fault.

[0123] Figure 4 What is shown is the increase a...

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Abstract

The invention discloses a superconducting energy storage control method for improving the transient power angle stability of a fan-containing system. The method comprises the steps of obtaining an influence formula of system power angle real-time change and DFIG output external characteristics on equivalent system electromagnetic power variation [delta]Pe by analyzing and deriving an influence relation of factors such as DFIG grid-connected position, power output characteristics and system equivalent power angle on the transient power angle stability of the system; and determining an accuratecontrol rule of SMES active and reactive output beneficial to the transient power angle stabilization of the system. According to the invention, the flexible four-quadrant power output capability of the SMES is fully utilized, the input and output of SMES power are controlled in real time according to the DFIG access position and transient power angle change information of the system in the transient period, the active and reactive power of a DFIG grid-connected point is compensated, and the purpose of improving the transient power angle stability of the system is achieved by increasing the deceleration area of the system and reducing the acceleration area of the system.

Description

technical field [0001] The invention relates to the technical field of improving the transient power angle stability of a power system, and more specifically relates to a superconducting energy storage control method for improving the transient power angle stability of a fan-containing system. Background technique [0002] With the continuous increase of the penetration power of wind power in the power system, the impact of wind farm access on the transient power angle stability of the system cannot be ignored. Due to its special structure, the doubly-fed asynchronous wind generator (DFIG) does not have power angle characteristics and does not have the electromechanical transient process in the traditional sense. It mainly affects the stability of the system by affecting the electromagnetic power of the synchronous unit through the output power. run. However, when the system is in a transient state with large disturbances, due to the relatively weak adjustment ability of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/28H02J3/38
CPCH02J3/24H02J3/28H02J3/38Y02E40/10Y02E40/60
Inventor 姜惠兰李政张驰
Owner TIANJIN UNIV
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