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Hydropower system ultralow frequency oscillation suppression method considering switching link

A frequency oscillation and ultra-low frequency technology, applied in the direction of reducing/preventing power oscillation, electrical components, circuit devices, etc., to achieve the effect of suppressing oscillation and improving system structure

Inactive Publication Date: 2021-08-06
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent proposes a suppression method based on improving the non-smooth structure for the problem of switching ultra-low frequency oscillation in the hydropower system with common dead zone and limiter at the same time.

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  • Hydropower system ultralow frequency oscillation suppression method considering switching link
  • Hydropower system ultralow frequency oscillation suppression method considering switching link
  • Hydropower system ultralow frequency oscillation suppression method considering switching link

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Embodiment Construction

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. 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.

[0019] The embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings, and the specific analysis process is as follows:

[0020] Step 1: Analyze the type of non-smooth system to which the hydropower system with switching links belongs.

[0021] Nonsmooth systems can be divided into piecewise smooth continuous systems, Filippov systems (piecewise smooth discontinuous systems) and nonsm...

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Abstract

The invention provides a hydropower system ultralow frequency oscillation suppression method considering a switching link. According to the hydropower system ultralow frequency oscillation suppression method, a switching structure of a non-smooth power system can be improved, so that ultralow-frequency oscillation generated in a high-water-electricity-proportion system is suppressed. The hydropower system ultralow frequency oscillation suppression method comprises the steps of: firstly, analyzing the type of a non-smooth system, and researching the bifurcation characteristics of the non-smooth system by adopting a corresponding bifurcation theory; secondly, calculating the bifurcation characteristics of a balance point of each region of the non-smooth system and the bifurcation characteristics of a trajectory along with the change of abrupt change load parameters, and further acquiring the corresponding non-smooth bifurcation type when the system generates ultralow frequency oscillation; and finally, providing the ultralow frequency oscillation suppression method for changing the switching structure for the switching link influencing the bifurcation characteristics.

Description

technical field [0001] The invention belongs to the field of power system stability analysis and control, and in particular relates to an ultra-low frequency oscillation suppression method based on non-smooth bifurcation theory. Background technique [0002] In recent years, ultra-low-frequency frequency oscillation accidents related to hydraulic turbine speed control systems have occurred many times in power systems with high hydropower ratios at home and abroad. This type of oscillation has a long period, low frequency, and large mechanical power amplitude. In the past, there was a large difference in low-frequency oscillation, which was a frequency stability problem. At present, the mechanism of ultra-low frequency oscillation includes negative damping oscillation, forced oscillation and switching oscillation. The first two oscillation mechanisms believe that the water hammer effect of the turbine unit and the unreasonable setting of control parameters provide negative d...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/241
Inventor 薛安成刘晓博孔贺王永杰王嘉伟付潇宇庄文彬郭鹏程李业成汪云涛
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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