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Grid-connected converter negative sequence current compensation method

A compensation method and negative-sequence current technology, applied in the direction of AC network voltage adjustment, reducing/preventing power oscillation, etc., can solve the problem of difficulty in determining the reasonable range of negative-sequence compensation current command quantity, difficulty in controlling DC bus voltage, and current conversion problems. Problems such as high distortion rate of the output current of the device

Active Publication Date: 2015-10-28
NANJING INST OF TECH
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Problems solved by technology

On the one hand, the present invention realizes the decoupling of DC power and AC power control, and solves the problems of difficult control of DC bus voltage and high distortion rate of converter output current in the process of negative sequence current compensation; on the other hand, it breaks through negative sequence compensation The technical problem that it is difficult to determine the reasonable given range of the current command quantity

Method used

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  • Grid-connected converter negative sequence current compensation method
  • Grid-connected converter negative sequence current compensation method
  • Grid-connected converter negative sequence current compensation method

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0050] 1) The hardware topology of the grid-connected converter is as follows: figure 1 shown. Let the positive sequence q-axis voltage in the synchronous rotating coordinate system Let the negative sequence q-axis voltage in the synchronous rotating coordinate system In the formula, the subscript "g" represents the physical quantity on the grid side, "d" represents the d-axis of the synchronous rotating coordinate system, "q" represents the q-axis of the synchronous rotating coordinate system, "p" represents the positive sequence component, and "n" represents the negative sequence component ; The superscript "p" indicates that the component is located in the positive sequence synchronous r...

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Abstract

The invention discloses a grid-connected converter negative sequence current compensation method. The voltage of a direct current bus of a grid-connected converter is sampled. Square calculation, notch filtering and square root calculation are carried out on the sample value. Voltage fluctuation component of the direct current bus is filtered out. Through decoupling of alternating current-direct current active power of the direct current bus, closed-loop control is carried out on the voltage of the direct current bus of the grid-connected converter. According to the invention, the problem of disturbance of fluctuations of alternating current active power of the direct current bus on the voltage of the direct current bus and grid-connected current control is solved when the grid-connected converter carries out negative sequence current compensation; the control accuracy of the voltage of the direct current bus and the power quality of grid-connected current are effectively improved; and through decoupling of alternating current-direct current active power of the direct current bus of the grid-connected converter, the maximum fluctuation amplitude of the voltage of the direct current bus is accurately calculated in a negative sequence current compensation process.

Description

technical field [0001] The invention relates to a negative-sequence current compensation strategy of a grid-connected converter based on AC-DC active power decoupling of a DC bus, and belongs to the technical field of power electronics applications. Background technique [0002] Due to the existence of grid faults, three-phase asymmetrical loads or power supply three-phase grid-connected current asymmetry, the load or power supply injects negative sequence current into the power system through the grid access point, which significantly affects the three-phase symmetry of the grid voltage, and even causes The further seriousness of grid failure. The negative-sequence current of a specific grid access point can be detected through the grid-connected converter, and the negative-sequence current compensation can be realized. However, due to the output of the negative-sequence compensation current and the instantaneous power output of the grid-connected converter, there are AC p...

Claims

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Application Information

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IPC IPC(8): H02J3/12H02J3/24
Inventor 骆皓朱泓朱剑锋曹阳郝立马寿虎
Owner NANJING INST OF TECH
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