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Method for inhibiting subsynchronous resonance of wind power system

A sub-synchronous resonance and wind power system technology, applied in wind power generation, harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve problems such as limited control effect, unable to correct trigger delay angle, etc., to achieve easy implementation , Suppressing SSR, suppressing the effect of subsynchronous resonance

Inactive Publication Date: 2011-02-09
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

Open-loop control is open-loop impedance control. Its control strategy is simple and easy to implement, but it cannot correct the trigger delay angle, so the control effect is limited.

Method used

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  • Method for inhibiting subsynchronous resonance of wind power system
  • Method for inhibiting subsynchronous resonance of wind power system
  • Method for inhibiting subsynchronous resonance of wind power system

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Embodiment Construction

[0034] The present invention is based on the joint operation mode of PSCAD / EMTDC software and MATLAB software, utilizes the calculation function of MATLAB, can design the additional damping control algorithm, through MATLAB, proposes a kind of method for obtaining the trigger delay angle of controllable series compensation TCSC, by MATLAB Output the calculated trigger delay angle, and control the controllable series compensation trigger in the PSCAD / EMTDC software.

[0035] The schematic diagram of PSCAD / EMTDC of the present invention and MATLAB joint operation structure is as figure 2 shown. There is a Fortran file DSDYN in PSCAD / EMTDC, through which external Fortran subroutines can be called. This Fortran subroutine can start the MATLAB data engine and establish the communication channel between the Fortran subroutine and the MATLAB data engine. At the same time, the M file containing the MATLAB command is also transmitted to the MATLAB data engine, so that PSCAD / EMTDC and...

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Abstract

The invention relates to a method for inhibiting the subsynchronous resonance of a wind power system. Based on a controlled series compensation method, a trigger delay angle of a controlled series compensation thyristor valve group is controlled and the current of a valve group reactor L is adjusted, so that controlled series compensation equivalent impedence is controlled, the equivalent impedence is corrected in a closed-loop control mode, and the trigger delay angle is corrected in real time. The method is characterized in that: by adopting a PSCAD / EMTDC software and MATLAB software joint operation mode and based on an MATLAB computing method and phase shift between capacitor voltage zero-crossing moment and synchronous turnover moment, an additional damping control algorithm is designed, the controlled series compensation real trigger delay angle is calculated and the subsynchronous resonance is inhibited.

Description

technical field [0001] The invention relates to wind power grid connection technology, in particular to a method for suppressing subsynchronous resonance of a wind power system. Background technique [0002] With the development and maturity of wind power generation technology, the installed capacity of wind turbines is increasing, which means that large-scale access of wind power to the existing power grid has become an inevitable trend. Considering the characteristics of the grid structure of the wind farm and the power grid, in order to increase the transmission power of wind power connected to the grid and improve the voltage distribution along the line, the use of series compensation capacitors is an effective way. However, the connection of series compensation capacitors will lead to subsynchronous resonance (SSR) of the power system at the same time, thus endangering the safe and stable operation of the power grid. In order to suppress this destructive phenomenon, co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01
CPCY02E10/763Y02E10/76Y02E40/40
Inventor 汤奕郁瑞倩
Owner SOUTHEAST UNIV
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