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Cascaded H-bridge converter flexible grid connection method based on hierarchical voltage control

A voltage control and converter technology, applied in the field of flexible grid connection of cascaded H-bridge converters, can solve problems such as device burnout and lower power supply reliability, achieve overall voltage and power level improvement, and realize grid-connected and off-grid switching Effect

Active Publication Date: 2020-01-14
TIANJIN UNIV
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Problems solved by technology

In the cascaded system, in order to avoid the overload of a single H-bridge and cause the device to burn out and reduce the reliability of the power supply, it is necessary to develop a power distribution control method in the cascaded system in the grid-connected mode
[0003] However, the vast majority of papers and published patents mainly focus on the output power and current response of multilevel converter technology and cascaded grid-connected inverters. Equal Power Distribution Performance of H-Bridge
In the existing technology, there is no power distribution control method suitable for cascaded H-bridges in grid-connected mode, which can realize cooperative control among multiple cascaded inverters in the case of low-bandwidth communication, and improve distributed The voltage level of the power supply

Method used

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  • Cascaded H-bridge converter flexible grid connection method based on hierarchical voltage control
  • Cascaded H-bridge converter flexible grid connection method based on hierarchical voltage control
  • Cascaded H-bridge converter flexible grid connection method based on hierarchical voltage control

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Embodiment Construction

[0029] 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.

[0030] The invention provides a method for flexible grid connection of cascaded H-bridge converters based on layered voltage control, figure 1 It is the circuit topological structure and control block diagram of the present invention. Such as figure 1 As shown, k=3 is taken as an example for illustration.

[0031] The cascaded H-bridge converter is composed of three cascaded H-bridges connected end to end, which are used to improve the overall output voltage level and power capacity, and to control the external characteristics of the cascaded H-bridge to achieve low-voltage distributed power friendly type grid-connected, to inject the required active and reactive power into the gri...

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Abstract

The invention discloses a cascaded H-bridge converter flexible grid connection method based on hierarchical voltage control. The cascaded H-bridge converter is composed of k H-bridges which are connected in an end-to-end way and used for improving the overall output voltage level and power capacity, realizing friendly grid connection of low voltage distributed power sources and injecting requiredactive power and reactive power into the grid. The central controller realizes accurate power control of parallel nodes by means of hierarchical control and the local controller performs secondary adjustment to realize internal power distribution of the cascaded system. The hierarchical control strategy has flexible power control performance, provides a favorable supplement for the control strategy of the future photovoltaic and energy storage cascade system and has high practicability.

Description

technical field [0001] The invention relates to a flexible grid-connection method for cascaded H-bridge converters, specifically realizing power distribution inside the cascaded converters in a layered control manner. Background technique [0002] The increasing installation of distributed renewable energy and energy storage has brought structural changes to modern power distribution systems. However, the output voltage level of general photovoltaic power generation or energy storage devices is relatively low, and a cascaded structure is required to reasonably increase the voltage, thereby increasing the overall power output level. In order to achieve flexible control of low-voltage DC power sources such as independent photovoltaic units and energy storage units, the form of direct connection of a converter to a single DC source is generally adopted, and the output of multiple converters is cascaded to perform string-type grid connection. In the cascaded system, in order to...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/32H02J3/46
CPCH02J3/32H02J3/46Y02E70/30Y02E10/56
Inventor 刘宇何晋伟
Owner TIANJIN UNIV
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