DC blocking suppression method for continuous commutation failure based on sound DC emergency support

A technology for commutation failure and emergency support, which is applied in the direction of power transmission and AC networks, and can solve problems such as load shedding, economic loss during system recovery and start-up, and grid frequency problems

Active Publication Date: 2020-06-30
CHONGQING UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

However, blocking the DC system may cause grid frequency problems, resulting in large-scale machine and load shedding
Large-scale removal of generators will lead to long-term system recovery and start-up process, resulting in negative impacts such as economic losses

Method used

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  • DC blocking suppression method for continuous commutation failure based on sound DC emergency support
  • DC blocking suppression method for continuous commutation failure based on sound DC emergency support
  • DC blocking suppression method for continuous commutation failure based on sound DC emergency support

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Embodiment Construction

[0056] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0057] Such as Figure 5 As shown, the present invention discloses a continuous commutation failure DC blocking suppression method based on sound DC emergency support, including the following steps:

[0058] Step 1: Solve the power angle difference steady-state value δ1 corresponding to the steady-state operating point a and the power angle difference δh corresponding to the critical stable operating point h. When the commutation failure signal is detected, record the number of commutation failures k=1, and set ΔT is the duration of a commutation failure power sag, the change process of the equivalent mechanical power and electromagnetic power caused by a commutation failure power sag is divided into n cycles according to the step size Δt, and the discrete sampling is obtained The sequence of points is [t 1 ,t 2 ,t 3 ,...,t n ], where n=ΔT / Δt, t n = t ...

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Abstract

The invention discloses a continuous commutation failure DC blocking suppression method based on sound DC emergency support. For the influence of power sag on the stability of the transmission end grid during the DC continuous commutation failure, a rolling calculation method for the power angle difference and the acceleration area variation of the transmitting end system during the DC continuouscommutation failure process is established through the DC commutation failure signal of the continuous commutation failure and the receiving end AC commutation voltage detection, and a sound DC emergency power control command is obtained by rolling calculation of the relative magnitudes of the acceleration and deceleration areas to implement control. The method provided by the invention can not only effectively reduce the risk of DC blocking of continuous commutation failure, but also reduce the cutting capacity of the DC transmission end grid and improve the stability and economy of the AC / DCgrid operation.

Description

technical field [0001] The invention relates to the technical field of power system protection and control, in particular to a method for suppressing DC blocking of continuous commutation failure based on sound DC emergency support. Background technique [0002] With the rapid development of large-capacity UHV DC transmission technology and the accelerated construction of DC projects, the AC-DC hybrid power grid is forming an operation pattern of paralleling multiple DCs and strong DC and weak AC. For large-scale DC asynchronous interconnection systems, due to the increasing transmission capacity of DC projects, the dynamic response of the DC system has an increasingly significant impact on the AC grid. Power grid disturbances can easily lead to commutation failures in UHV DC systems. During the period of commutation failures, the transmission power of the DC system will be greatly reduced for a short time, which will affect the stability margin of the AC grid and seriously ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 欧阳金鑫肖超熊小伏魏碧桧
Owner CHONGQING UNIV
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