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Control method for wind power current converter based on positive-and-negative sequence current inner-loop control

A technology of current inner loop and control method, which is applied in the direction of converting irreversible AC power input to DC power output, wind power generation, and AC network to reduce harmonics/ripples, etc., and can solve the problem of second harmonic amplitude increase, Problems such as PWM converter burnout, affecting the performance of the converter circuit, etc.

Active Publication Date: 2015-06-24
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

And when there is an asymmetrical fault in the grid voltage, this control strategy will generate second harmonics, which will affect the performance of the converter circuit
The traditional control strategy cannot guarantee a good effect. The amplitude of the second harmonic increases, resulting in non-characteristic harmonics. At the same time, the loss increases accordingly. In severe cases, it may cause the burning of the PWM converter.

Method used

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  • Control method for wind power current converter based on positive-and-negative sequence current inner-loop control
  • Control method for wind power current converter based on positive-and-negative sequence current inner-loop control
  • Control method for wind power current converter based on positive-and-negative sequence current inner-loop control

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Embodiment

[0045] like figure 1 As shown, a wind power converter control method based on positive and negative sequence current inner loop control includes the following steps:

[0046] 1) Detect the power parameters of the power grid, and judge the type of asymmetric fault in the power grid. The asymmetric fault types include three-phase voltage equivalent drop fault, single-phase voltage drop fault, phase-to-phase voltage fault, and two-phase-to-ground short circuit fault;

[0047] 2) According to the detection of asymmetrical fault types, the unbalanced power grid power that has failed can be obtained. The unbalanced power grid power can be divided into positive sequence power components and negative sequence power components. The positive sequence power components include voltage positive sequence components and current positive sequence components. The negative-sequence power component mentioned above includes the current positive-sequence component and the current negative-sequence...

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Abstract

The invention relates to a control method for a wind power current converter based on positive-and-negative sequence current inner-loop control. The control method comprises the following steps that firstly, an electric quantity parameter of a power grid is detected, and an asymmetrical fault type which occurs on the power grid is judged; secondly, a malfunctioned unbalanced power grid electric quantity is detected and acquired according to the asymmetrical fault type; the malfunctioned unbalanced power grid electric quantity is decomposed into a positive-sequence component and a negative-sequence component, and the positive-sequence component and the negative-sequence component are converted to a positive-rotation coordinate system and a negative-rotation coordinate system; fourthly, a positive-sequence current control model and a negative-sequence current control model are established, according to the control models, a second harmonic component of an asymmetrical power grid fault is eliminated, and a sinusoidal waveform of the output electric quantity is guaranteed. Compared with the prior art, the control method has the advantages that the control performance is good, and the method is advance.

Description

technical field [0001] The present invention relates to a control method of a wind power converter, in particular to a control method of a wind power converter based on positive and negative sequence current inner loop control Background technique [0002] The traditional DC transmission PWM converter control strategy assumes that the power grid is symmetrical, and the three-phase voltages are 120 degrees different in time and space. However, when the grid voltage has an asymmetrical fault, this control strategy will generate second harmonics, which will affect the performance of the converter circuit. The traditional control strategy cannot guarantee a good effect. The amplitude of the second harmonic increases, resulting in non-characteristic harmonics. At the same time, the loss increases accordingly. In severe cases, the PWM converter may be burned. Therefore, in recent years, the control strategy of PWM converters under asymmetrical faults has been studied at home and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/02H02J3/01
CPCY02E10/76Y02E40/40
Inventor 蒋辰晖
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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