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Sub-synchronous oscillation suppression method based on fully-controlled inverter

A sub-synchronous oscillation and full-control technology, applied in the direction of reducing/preventing power oscillation, etc., to achieve the effects of small footprint, small output harmonics, and fast response

Active Publication Date: 2014-12-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, these methods have certain defects in response speed, floor space, suppression of subsynchronous resonance caused by fixed series compensation, and comprehensive ability of subsynchronous oscillation caused by HVDC, PSS and FACTS devices, etc., and a remedy is still needed Methods of suppressing the above disadvantages

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  • Sub-synchronous oscillation suppression method based on fully-controlled inverter
  • Sub-synchronous oscillation suppression method based on fully-controlled inverter
  • Sub-synchronous oscillation suppression method based on fully-controlled inverter

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Embodiment Construction

[0020] The method for subsynchronous oscillation damping blocking combined with suppression will be described in detail below with reference to the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0021] The invention provides a combined damping and blocking method for suppressing subsynchronous oscillation based on a fully-controlled inverter, which is used to suppress subsynchronous oscillation in a power system: the fully-controlled inverter is connected in parallel through a transformer or a small inductor Into the system, using the direct current control of dq decoupling, through the subsynchronous current filter, extract the subsynchronous component of the system side current at the access point of the full control inverter in the dq coordinate system, and use it as the controller d The outer loop input of the axis and q axis is used to generate the ...

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Abstract

The invention discloses a sub-synchronous oscillation suppression method based on a fully-controlled inverter in the field of stabilization and control of power systems. The method comprises the following steps of: respectively extracting sub-synchronous frequency components from a generator rotating speed deviation signal, from line current d-axis components and from line current q-axis components; acquiring the voltage deviation value of a direct current capacitor of the fully-controlled inverter; and inputting the sub-synchronous frequency components into the fully-controlled inverter, generating corresponding voltage components, and generating current components which are used for suppressing sub-synchronous oscillation and stabilizing the direct current voltage of the fully-controlled inverter. The method is high in response speed, and the sub-synchronous oscillation caused by various reasons can be effectively suppressed.

Description

technical field [0001] The invention belongs to the field of power system stability and control, and in particular relates to a subsynchronous oscillation suppression method based on a fully-controlled inverter. Background technique [0002] With the continuous development of my country's power system, large-capacity, long-distance, and cross-regional power transmission has become an inevitable trend in the development of power systems. Fixed series capacitor compensation and high voltage direct current transmission (HVDC) are cost-effective measures to improve power system transmission capacity and stability. However, fixed series capacitor compensation will cause subsynchronous resonance of the generator set, and HVDC will generate mutual excitation with the generator set closer to it, resulting in subsynchronous oscillation. Both phenomena may lead to shafting fatigue of the generator set. It may even cause the shafting to break. In terms of subsynchronous oscillation s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
Inventor 张剑肖湘宁郭春林杨琳高本锋
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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