Method and device for detecting voltage flicker of grid-connected point of wind turbine generator system

A technology for wind turbines and voltage flicker, which is applied to measuring devices, measuring current/voltage, measuring electrical variables, etc., and can solve the problems of wind turbine output power fluctuation, voltage deviation, voltage flicker, etc.

Active Publication Date: 2013-02-13
SINOVEL WIND GRP
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Problems solved by technology

For example, during the continuous operation of grid-connected wind turbines, there are factors such as tower shadow effect, yaw error, and wind shear, and the torque generated by the impeller of the wind turbine is also unstable during one revolution. Torque flu

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  • Method and device for detecting voltage flicker of grid-connected point of wind turbine generator system

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Embodiment Construction

[0040] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0041] figure 1 It is a schematic diagram of the virtual grid phase diagram. The International Electrotechnical Commission (IEC) 61000-4-15 standard introduces the phase diagram of the virtual grid, which uses an ideal voltage source phase voltage instantaneous value u 0 (t) and a virtual grid resistor R fic and virtual grid inductance L fic The grid impedance formed in series is represented. The wind turbine adopts the current source i m (t) Measured instantaneous value representation of line current. The phase diagram of the virtual grid gives the expression u of the instantaneous value of the simulated phase voltage of the virtual grid fic (t) as follows:

[0042] u fic ( t ) = u 0 ...

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Abstract

The invention provides a method and a device for detecting the voltage flicker of a grid-connected point of a wind turbine generator system. The method comprises the steps: sampling at an output end of a single fan to obtain a three-phase current signal and a three-phase voltage signal, separating and combining the obtained three-phase current signal and the three-phase voltage signal to obtain three ways of single-phase signals; respectively inputting the three ways of single-phase signals into a virtual power grid numerical value model and a virtual power grid circuit model, wherein the virtual power grid numerical value model is established according to a virtual power grid simulation phase voltage instantaneous value expression, the virtual power grid circuit model is established according to a virtual power grid phase diagraph and parallel resistors R are merged into two ends of a current source in the phase diagraph; measuring reference voltage us at a PCC point of the virtual power grid numerical value model and the voltage ud at a PCC point in the virtual power grid circuit model; measuring the flicker value pst1 of the reference voltage us at the PCC point and the flicker value pst2 of the voltage ud at the PCC point; and obtaining the flicker accuracy value of the voltage ud at the PCC point according to the flicker value pst1 and the flicker value pst2.

Description

technical field [0001] The invention relates to a power quality detection technology of a grid-connected point of wind power generation, in particular to a method and device for detecting voltage flicker at a grid-connected point of a wind power generating set. Background technique [0002] As more and more wind turbines are connected to the grid, the impact of wind power generation on the power quality of the grid has attracted widespread attention. [0003] The uncertainty of wind resources and the operating characteristics of wind turbines make the output power of wind turbines fluctuate. For example, during the continuous operation of grid-connected wind turbines, there are factors such as tower shadow effect, yaw error, and wind shear, and the torque generated by the impeller of the wind turbine is also unstable during one revolution. Torque fluctuations will also cause fluctuations in the output power of wind turbines. There are fluctuations in the output power of wi...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 王沛然李斌芮守娟王杰贾媛
Owner SINOVEL WIND GRP
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