A Model-Free Adaptive Iterative Learning MMC Converter Control Method Combined with Adaptive Circulating Current Suppression
A model-free self-adaptive, iterative learning control technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc. Accuracy issues, etc.
Active Publication Date: 2020-08-11
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology
On the one hand, due to the multi-level topology of the MMC converter, there are certain differences in the performance parameters of a large number of switching devices and energy storage components, which makes the control based on the average steady-state model design have control accuracy problems; on the other hand, the MMC The AC side where the converter is connected may have the problem of grid fundamental frequency offset and harmonic distortion disturbance, which makes the bridge arm circulation problem of the MMC converter more complicated, and the conventional circulation suppression effect will be affected
Method used
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Embodiment Construction
[0057] refer to figure 1 , a schematic diagram of a single-phase circuit of an MMC converter involved in an embodiment of the present invention, where the grid-side three-phase AC voltage u j The total harmonic distortion rate is 3.26%; the fundamental frequency is positively shifted by 0.5Hz.
[0058] refer to figure 2 , a model-free self-adaptive iterative learning MMC converter control method fused with self-adaptive circulation suppression of the present invention, comprising the steps of:
[0059] 1) Voltage outer loop model-free adaptive iterative learning control
[0060] ① At the beginning of each sampling period, the DC side voltage u of the MMC converter dc to sample;
[0061] ②Set the given voltage value with u dc Send it into the voltage control loop to get the current command signal i dref , the voltage outer loop model-free adaptive iterative learning control method is calculated according to formula (1) - formula (5);
[0062]
[0063]
[0064] ...
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The invention discloses a model-free adaptive iterative learning modular multilevel converter (MMC) control method fusing adaptive ring current restraining. The model-free adaptive iterative learningMMC control method is characterized by comprising the steps of model-free adaptive iterative learning control over a voltage outer ring, model-free adaptive prediction control over a current inner ring, adaptive ring current restraining control and the like. Model-free adaptive iterative learning control is introduced and used for the direct-current side of the MMC, and thus the direct-current voltage can be accurately tracked and controlled; by introducing model-free adaptive prediction control over the current inner ring, current control precision can be improved, and thus the current waveform quality is improved; and by introducing adaptive ring current restraining control, the ring current restraining effect under the background of disturbance on the alternate-current side and the direct-current side of the MMC can be improved, and thus reliable work of the MMC is ensured.
Description
technical field [0001] The invention relates to the technical field of power electronics, and relates to a model-free self-adaptive iterative learning MMC converter control method which integrates self-adaptive circulation suppression. Background technique [0002] MMC converter, also known as: modular multilevel converter (MMC) is widely used in DC power grids, and is an important link to realize energy transfer and regulation at both ends of AC and DC. On the one hand, due to the multi-level topology of the MMC converter, there are certain differences in the performance parameters of a large number of switching devices and energy storage components, which makes the control based on the average steady-state model design have control accuracy problems; on the other hand, the MMC The AC side where the converter is connected may have the problem of grid fundamental frequency offset and harmonic distortion disturbance, which makes the bridge arm circulation problem of the MMC c...
Claims
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IPC IPC(8): H02M7/219H02M7/5387H02M7/483
Inventor 李玲金国彬李国庆王振浩刘钊权然石超潘狄于泽平
Owner NORTHEAST DIANLI UNIVERSITY