Multi-objective collaborative optimization control method applied to direct-current three-level converter

A control method and collaborative optimization technology, applied in the direction of converting DC power input to DC power output, DC network circuit devices, and adjusting electrical variables, can solve the complexity of external characteristics of energy storage equipment and the uncertainty of distributed energy generation equipment Complicated problems, to achieve the effect of efficient calculation implementation method, convenient expansion of system capacity, and simple principle

Active Publication Date: 2020-04-21
TIANJIN UNIV
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Problems solved by technology

The characteristics of existing distributed energy storage systems include the complexity of the external characteristics of different types of energy storage equipment, and the complexity caused by the uncertainty of distributed energy gene

Method used

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  • Multi-objective collaborative optimization control method applied to direct-current three-level converter
  • Multi-objective collaborative optimization control method applied to direct-current three-level converter
  • Multi-objective collaborative optimization control method applied to direct-current three-level converter

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0038] figure 1 is the circuit topology of the DC three-level converter in the present invention, figure 2 It is a multi-objective collaborative optimization control block diagram in the present invention. The present invention can suppress midpoint voltage fluctuation while improving the accuracy of DC bus voltage regulation, and the basic steps are as follows:

[0039] (1) Sampling the input side inductor current i at time k by the current and voltage sensor L (k) and the voltage value of the voltage dividing capacitor on the output side V c1 (k), V c2 (k);

[0040] (2) Determine the energy flow direction according to the direction of the inductor current;

[0041] a) If the...

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Abstract

The invention discloses a multi-objective collaborative optimization control method applied to a direct-current three-level converter. The neutral-point voltage fluctuation can be suppressed while thevoltage regulation precision of a direct-current bus can be improved. The method comprises the following steps: 1, flexibly adjusting input power to meet the requirement of multi-port energy storage;2, controlling the voltage of an output-side direct-current bus to be stable; and 3, carrying out voltage-sharing control on the voltage-dividing capacitor at the output side. The method is a multi-objective collaborative optimization control method and is suitable for a direct-current microgrid system containing a direct-current three-level converter.

Description

technical field [0001] The invention relates to the field of energy storage converters of a DC micro-grid system, in particular to a multi-objective optimization control method applicable to DC three-level converters for suppressing midpoint voltage fluctuations. Background technique [0002] With the expansion of the scale of the DC micro-grid system, the problem of solving the consumption of distributed energy is becoming more and more prominent, which poses a higher challenge to the flexible control of the energy storage system. The characteristics of existing distributed energy storage systems include the complexity of the external characteristics of different types of energy storage equipment, and the complexity caused by the uncertainty of distributed energy generation equipment. As the interface converter between the energy storage device and the DC micro-grid, the DC three-level converter needs to be improved urgently to adapt its control principle to the complex mic...

Claims

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Application Information

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IPC IPC(8): H02M3/158H02J1/00
CPCH02M3/1582H02J1/00
Inventor 杨茹楠何晋伟
Owner TIANJIN UNIV
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