A diode-clamped three-level inverter hybrid passive control system and method
A three-level inverter, diode clamping technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problem that photovoltaic grid-connected systems cannot continue to maintain stable operation, increase system computational complexity and time, and reduce system costs. Control performance and other issues to meet the requirements of low voltage ride-through, reduce operation time, and improve system efficiency
Active Publication Date: 2020-10-27
SHANDONG UNIV
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Problems solved by technology
The asymmetrical current makes the mid-point voltage of the DC side fluctuate significantly, which will cause more harmonics, making the photovoltaic grid-connected system unable to continue to maintain stable operation
The specific inventor understands that when the power grid is unbalanced, the currently commonly used method based on the separation of positive and negative sequences controls the positive and negative sequence components separately in the positive and negative sequence synchronous rotating coordinate system, which requires the separation of positive and negative sequences, which increases the complexity of system calculations degree and time, reducing the control performance of the system
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[0040] The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.
[0041] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
[0042] It should be noted that the terminology used herein is only for describing specific embodiments, and is not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.
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The present disclosure provides a diode-clamped three-level inverter hybrid passive control system and method, based on a diode-clamped three-level inverter topology and several controllers, a diode-clamped three-level inverter topology The output current of the structure adopts a hybrid passive controller to realize the fast tracking control of the current in the positive sequence synchronous rotating coordinate system; the modulation of the diode-clamped three-level inverter topology adopts an SVM modulation controller; the diode-clamped The midpoint voltage of the three-level inverter topology is controlled by a proportional controller, which adjusts the action time of the redundant small vector to achieve balanced control; it has precise control performance and theoretically ensures the stability of the system, and It avoids the complicated calculation caused by the separation of the positive and negative sequences of the double synchronous rotating coordinate system, greatly reduces the calculation time, and improves the system efficiency.
Description
technical field [0001] The disclosure relates to the field of inverter control, in particular to a hybrid passive control system and method for a diode-clamped three-level inverter. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] In recent years, three-level converters have played an important role in many industrial application fields such as distributed power generation systems, photovoltaic (Photovoltaic, PV) power generation systems, and power quality management. Diode-clamped three-level converters have the advantages of low voltage stress, small output waveform harmonics, bidirectional power flow, and high efficiency, and have been widely used in medium and high voltage photovoltaic systems. [0004] As the penetration rate of photovoltaics increases, its impact on the grid is increasing. At the same time, when the power grid fail...
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IPC IPC(8): H02J3/16H02J3/38H02M7/487
CPCH02J3/383H02J3/16H02M7/487H02J2203/20Y02E10/56Y02E40/30
Inventor 张承慧姜英邢相洋李晓艳秦昌伟
Owner SHANDONG UNIV
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