A wind power converter control method based on positive and negative sequence current inner loop control
A technology of current inner loop and control method, applied in the direction of converting irreversible AC power input to DC power output, wind power generation, AC network to reduce harmonics/ripples, etc. Affect the performance of the converter circuit, the burning of the PWM converter, etc., to achieve the effect of suppressing the generation of harmonic power, excellent control performance, and stable input current
Active Publication Date: 2017-03-01
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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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.
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[0045] Such as 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 determine the types of asymmetric faults that occur in the power grid. The types of asymmetric faults include three-phase voltage equivalent drop faults, single-phase voltage drop faults, phase-to-phase voltage faults and two-phase-to-ground short-circuit faults;
[0047] 2) According to the detection of the asymmetric fault type, the unbalanced power grid power that has failed is 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 electric quantity component includes the voltage negative sequence component and the current neg...
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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 invention relates to a method for controlling a wind power converter, in particular to a method for controlling 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 differ by 120 degrees in time and space. When an asymmetric fault occurs in the grid voltage, this control strategy will generate second harmonics, which will affect the performance of the converter circuit. Traditional control strategies cannot guarantee good results. The amplitude of the second harmonic increases and non-characteristic harmonics are generated. At the same time, the loss increases correspondingly, which may cause the PWM converter to burn out in severe cases. Therefore, in recent years, domestic and foreign researches have been conducted on the control strategies of PWM inv...
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IPC IPC(8): H02M7/02H02J3/01
CPCY02E10/76Y02E40/40
Inventor 蒋辰晖
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO