Doubly-fed wind power grid-connected system stability adjustment system and method

A system stability, doubly-fed wind power technology, applied in the direction of wind power generation, single-network parallel feeding arrangement, etc., can solve the problems of dependence on state variables, system disturbance and instability, lack of research, etc., to achieve small calculation and smooth adjustment process Faster, better damping effect
CN110417054AActive Publication Date: 2019-11-05NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Publication Date
2019-11-05

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Abstract

The invention relates to a doubly-fed wind power grid-connected system stability adjustment system and method, belongs to the technical field of wind power generation system, and solves the problem inthe prior art that it is difficult to quantitatively analyze and adjust the stability of the system for machine-grid coupling in the doubly-fed wind power grid-connected system. The method comprisesthe following steps: collecting the voltage and current data of a doubly-fed wind turbine port in a power network system which generates low frequency oscillation and calculating the real-time dynamicenergy of the doubly-fed wind turbine port; obtaining the dissipation intensity of the doubly-fed wind turbine according to the calculated real-time dynamic energy; obtaining the damping level of thedoubly-fed wind turbine to low frequency oscillation according to the dissipation intensity evaluation of the doubly-fed wind turbine; and adjusting the phase-locked loop parameters based on the influence law of the phase-locked loop parameters on the damping level of doubly-fed wind turbine and improving the damping level of the doubly-fed wind turbine until the damping level meets the requirements. The timely oscillation stability early warning can be realized and stability adjustment of the system can be realized by adjusting the phase-locked loop parameters.
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Description

technical field

[0001] The invention relates to the technical field of wind power generation systems, in particular to a stability adjustment system and method for a doubly-fed wind power grid-connected system. Background technique

[0002] With the large-scale grid-connection of wind turbines, the stability of wind power grid-connection has gradually become prominent. The weak coupling between the rotor and the stator of the double-fed wind turbine makes the wind turbine present weak damping characteristics after the system is disturbed, and the introduction of the phase-locked loop can stabilize the grid-connected voltage of the wind turbine and enhance the coupling between the wind turbine and the grid. Especially after low-frequency oscillation is detected at the wind turbine end, the phase-locked loop may amplify the system oscillation, deteriorate the system damping level, and threaten the safe and stable operation of the power grid. Therefore, it is urgent to carry o...

Claims

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