Method for maximizing electrical damping, damping controller and applications

Abstract

The invention discloses a method for maximizing electrical damping, a damping controller and applications, and belongs to the field of power system stability control. The method comprises the following steps: acquiring active current i[d] and reactive current i[q] output by a STATCOM in a phase-locked loop coordinate system; transforming the active current i[d] and the reactive current i[q] to obtain active current i<s>[d] and reactive current i<s>[q] in the rotor coordinate system; and according to the active current i<s>[d] and the reactive current i<s>[q], when STATCOM injection current flows into a generator, obtaining the amplitude and phase change expressions caused by the branch of apower grid; according to the amplitude and phase change expression, obtaining electrical damping when STATCOM injects suppression current to asynchronous machine; and obtaining the maximum amplitude of the electrical damping and compensating the phase in the electrical damping to obtain the target electrical damping. By taking full advantage of the limited capacity of STATCOM, the cost is reduced, the maximum electrical damping is provided, and the subsynchronous resonance caused by the series compensation connection of the thermal power generating unit and the power grid is well suppressed.

Description

technical field [0001] The invention belongs to the technical field of power system stability control, and more specifically relates to a method for suppressing subsynchronous resonance and maximizing electrical damping by using a static synchronous compensator STATCOM active and reactive dual-channel coordinated control, a damping controller and its application. Background technique [0002] With the construction of large-scale thermal power bases in my country and the formation of the west-to-east power grid pattern, large-scale long-distance power transmission has become an inevitable trend, and high-voltage and ultra-high-voltage AC transmission channels equipped with series compensation devices will become one of the important choices for future power transmission channels one. However, when a large thermal power unit is connected to an AC line with a series compensation device, subsynchronous resonance is very likely to occur, which threatens the safety of thermal power...

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for providing maximum electrical damping, a damping controller and its application, thereby solving the problem that active and reactive currents are not involved in the technique of applying STATCOM to suppress subsynchronous oscillations How to optimize the configuration and provide the technical problem of maximizing electrical damping

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