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Coordinated control method for directly driven permanent magnet synchronous generator under unbalanced and harmonic power grid

A permanent magnet synchronous and coordinated control technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, reduce/prevent power oscillations, etc., can solve wind turbines with weak grid connection, voltage imbalance and harmonics Distortion and other problems, to achieve the effects of electromagnetic torque oscillation suppression, suppression of grid side current fluctuations, and improvement of anti-disturbance performance

Inactive Publication Date: 2019-02-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Application Information

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Problems solved by technology

But in rural areas, where wind turbines are weakly connected to the grid, the voltage at the common coupling point may appear unbalanced and harmonically distorted due to unbalanced and non-linear loads

Method used

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  • Coordinated control method for directly driven permanent magnet synchronous generator under unbalanced and harmonic power grid
  • Coordinated control method for directly driven permanent magnet synchronous generator under unbalanced and harmonic power grid
  • Coordinated control method for directly driven permanent magnet synchronous generator under unbalanced and harmonic power grid

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Embodiment Construction

[0037] The invention provides a control method for a direct-drive permanent magnet synchronous generator under an unbalanced and harmonic power grid, which can suppress the voltage induced by unbalanced and nonlinear loads when the grid voltage is unbalanced and harmonically distorted. The negative sequence and harmonic current of the point of common coupling (PCC), and suppress the electromagnetic torque oscillation caused by the pulsating power transmitted from the grid side to the machine side. The power and current references of the two converters are derived, and a resonant controller is introduced in the control system to achieve accurate and fast static-difference-free regulation.

[0038] The present invention will be further described below in conjunction with accompanying drawings and examples of implementation.

[0039] refer to figure 1 The grid-side control method of a direct-drive permanent magnet synchronous generator coordinated control method provided by the ...

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Abstract

The invention discloses a coordinated control method for a directly driven permanent magnet synchronous generator (D-PMSG) under an unbalanced and harmonic power grid. The method comprises connectinga group of three inlet reactors in series to the three-phase input ends of a grid-side converter respectively; electrically connecting the grid-side converter and a machine-side converter through a DCbus capacitor back to back; connecting the D-PMSG in series to the output end of the machine-side converter to construct a permanent magnet wind driven generator set; using the permanent magnet winddriven generator set as a part of an active filter by injecting harmonic currents having equal amplitude and opposite phase to the grid side and by introducing a resonant controller to the machine side, so as to suppress the negative sequence and harmonic current introduced by an unbalanced and nonlinear load into a common coupling point when the grid voltage is subjected to unbalanced and harmonic distortion, and to suppress the electromagnetic torque oscillation caused by the pulsating power transmitted from the grid side to the machine side.

Description

technical field [0001] The invention relates to a coordinated control method of a direct-drive permanent magnet synchronous generator under an unbalanced and harmonic grid, which can be used as an improvement for a wind power generation system based on a permanent magnet synchronous motor when negative sequence and harmonic distortion occur in the grid voltage Control Method. Background technique [0002] With the serious coexistence of energy crisis and environmental pollution, the development and utilization of renewable energy such as wind energy has become the consensus of all countries in the world. More and more countries regard the development of wind power as the focus of future power investment. There are two main types of wind turbines, namely doubly fed induction generator (DFIG) and direct drive permanent magnet synchronous generator (directly driven permanent magnet synchronous generator D-PMSG). At present, wind turbines based on DFIG occupy a dominant positio...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/01
CPCH02J3/01H02J3/24Y02E40/40
Inventor 徐海亮王诗楠张禹风赵仁德王艳松何金奎
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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