Energy storage transient power coordination control method for suppressing subsequent commutation failure

A Technology of Commutation Failure and Coordinated Control

Pending Publication Date: 2021-05-28
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the commutation failure occurs, the DC voltage drops rapidly and the DC current increases sharply, causing serious impact on the system, and even causing the transmission power to be interrupted

Method used

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  • Energy storage transient power coordination control method for suppressing subsequent commutation failure
  • Energy storage transient power coordination control method for suppressing subsequent commutation failure
  • Energy storage transient power coordination control method for suppressing subsequent commutation failure

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Embodiment Construction

[0044]In order to make the objectives, technical solutions and advantages of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely intended to illustrate the invention and are not intended to limit the invention. Further, the technical features according to each of the various embodiments described below can be combined with each other as long as they do not constitute a collision between each other.

[0045]Seefigure 1 CombineFigures 2 to 7 The present invention provides an energy storage transient power coordination control method that suppresses the failure of subsequent phase failure, including:

[0046]S1: Continuous detection of real-time DC current IDCI And the AC bus voltage UACI And the extinguish angle γ. When real-time DC current IDCI Big than the first current threshold IDrefh Or AC bus voltage UACI Small t...

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Abstract

The invention discloses an energy storage transient power coordination control method for suppressing subsequent commutation failure, and belongs to the technical field of multi-infeed extra-high voltage alternating current and direct current hybrid power grids. The method comprises the following steps: detecting a direct current, an alternating current bus voltage and an extinction angle of an inverter side; and when the direct current is greater than a first current threshold value or the alternating current bus voltage is smaller than a voltage threshold value or the extinction angle is smaller than a first extinction angle threshold value, controlling an energy storage power station to enter a transient state control mode. According to the invention, an energy storage active output time instruction and a reactive output time instruction are respectively determined by detecting a direct current and an extinction angle of an inverter side, an active power output amplitude instruction is determined by detecting the voltage of an alternating current bus, a reactive power output amplitude instruction is determined by utilizing an energy storage total capacity constraint, and an energy storage active instruction and a reactive instruction of a target output amplitude are sent to an energy storage power station at the target output moment, so that subsequent commutation failure after the alternating-current and direct-current hybrid system breaks down can be effectively suppressed, and voltage recovery after the fault is promoted.

Description

Technical field[0001]The present invention belongs to the technical field of multi-feed-forward high-pressure, and more particularly to an energy storage transient power coordination control method for suppressing subsequent displacement failures.Background technique[0002]Displacement failure is one of the most common faults based on the high voltage DC transmission system of the power grid changing phase shifter. After the displacement failure, the DC voltage fell rapidly, and the DC current increased vigorously, and the system caused a serious impact on the system, and even the transmission power was interrupted. With the successive investment of high-voltage DC transmission project, the characteristics of my country's power grid "strong weakness, multi-return DC concentration", is increasingly highlighted, the support capacity of the connected grid is reduced, and the AC system failure may induce multiple exchange points of a single shift station. Failure, even caused DC lock, se...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/38H02J3/32H02J3/46
CPCH02J3/36H02J3/381H02J3/32H02J3/466H02J2203/20H02J2300/20H02J2300/40Y02E60/60H02J3/0012H02J3/00125H02J3/16H02J2203/10
Inventor 姚伟周泓宇艾小猛文劲宇李程昊高东学张景超
Owner HUAZHONG UNIV OF SCI & TECH
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