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System for suppressing oscillation of power system

A technology of power system and system voltage, applied in the field of power system, can solve problems such as insufficient damping, achieve the effect of improving safety and enhancing damping ratio

Pending Publication Date: 2020-09-22
国网安徽省电力有限公司全椒县供电公司
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Problems solved by technology

At the same time, using the above two PSSs, regardless of electric power or acceleration power, it is not sensitive to low-frequency oscillations below 0.2Hz, and provides the disadvantage of insufficient damping

Method used

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  • System for suppressing oscillation of power system
  • System for suppressing oscillation of power system
  • System for suppressing oscillation of power system

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

[0030] According to an embodiment of the present invention, a system for suppressing power system oscillations is provided.

[0031] Such as Figure 1-6 As shown, the system for suppressing power system oscillation according to the embodiment of the present invention includes a parallel electric power signal processing module, a rotational speed deviation processing module, an energy storage module and a conversion module, which includes the system voltage Us as a reference vector, setting T...

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Abstract

The invention discloses a system for suppressing oscillation of a power system, relating to the technical field of power systems.The system comprises an electric power signal processing module, a rotating speed deviation processing module, an energy storage module and a conversion module which are connected in parallel.The system voltage Us serves as a reference vector, the output voltage fundamental wave amplitude of a conversion module is set to be Ui, the angle of the voltage Ui of the conversion module ahead of the system voltage Us is set to be delta, the loss of a switching device, the connection reactance of a transformer and the conversion impedance satisfy Z = R + jX, and the impedance angle a = arctan (X / R). An electric power signal processing module anda rotating speed deviationprocessing moduleconnected in parallelas well as an energy storage module and a conversion module are combined; the parallel energy storage type flexible alternating-current power transmission containing additional damping control can effectively suppress power oscillation of an extra-high-voltage alternating-current line, the damping ratio of an interconnection system can be increased, power oscillation on the extra-high-voltage line can be effectively suppressed, a new technical measure is provided for safety and stability of a large-area interconnection system, and the operation safety ofthepower system is improved.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a system for suppressing power system oscillations. Background technique [0002] In order to solve the problem of the reverse distribution of energy resources and consumption demand in our country, and meet the urgent needs of load center power supply, development of clean energy, energy conservation and emission reduction, the country is vigorously building UHV AC-DC hybrid power grid. AC-DC UHV strengthens the interconnection of regional power grids, which not only improves the economy of power grid operation, but also improves the ability to resist disturbances and fault impacts, but inevitably causes low-frequency oscillation of the system and a decrease in damping ratio, and the dynamics of the power grid Stability risks are significantly increased. Power system stabilizer (PSS), as an additional excitation control, plays an important role in improving the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 董长海顾冬梅
Owner 国网安徽省电力有限公司全椒县供电公司
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