Efficiency optimization control method for bidirectional converter in microgrid energy storage system

A technology of bidirectional converter and energy storage system, applied in the field of microgrid, can solve the problems of ripple deterioration and low light load efficiency of bidirectional converter, so as to improve current ripple, optimize high-efficiency operation range, and improve system stability. Effects of Sex and Reliability

Inactive Publication Date: 2017-11-07
LIAONING TECHNICAL UNIVERSITY
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Problems solved by technology

[0006] In order to solve the problems that the light-load efficiency of the bidirectional converter in the current microgrid energy storage system is low, and the traditional phase-cut contr

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  • Efficiency optimization control method for bidirectional converter in microgrid energy storage system
  • Efficiency optimization control method for bidirectional converter in microgrid energy storage system
  • Efficiency optimization control method for bidirectional converter in microgrid energy storage system

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Embodiment Construction

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention Inside.

[0045] A bidirectional converter efficiency optimization control method in a microgrid energy storage system, such as figure 1 As shown, the micro-grid energy storage system includes one or more bidirectional converters and distributed battery energy storage modules. The bidirectional converters adopt a 6-phase interleaved parallel bidirectional converter main circuit topolog...

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Abstract

The invention discloses an efficiency optimization control method for a bidirectional converter in a microgrid energy storage system, which combines traditional light-load phase switching control, multi-degree of freedom frequency modulation control and a phase-shifting magnetic technology. The energy storage system adopts a six-phase interleaved parallel bidirectional converter main circuit. The efficiency optimization control method comprises the steps of firstly building a load current loss model, and deducing load current corresponding to an optimal phase switching point; secondly, seeking the optimal operating frequency under phase switching control by adopting multi-degree of freedom frequency control; and finally, suppressing ripple deterioration under the light load, the switched phase and the low frequency by adopting a phase shifting technology and a magnetic integration design to achieve a control target of higher efficiency operation under light load conditions. Compared with a bidirectional converter in the microgrid energy storage system in the prior art, the efficiency optimization control method can effectively improve low light-load efficiency of the bidirectional converter in the microgrid energy storage system and solve a problem of ripple deterioration easily caused by traditional phase switching control, greatly expands a high-efficiency operation range of the bidirectional converter and improves the stability and reliability of the system.

Description

technical field [0001] The invention relates to the field of microgrid technology, in particular to a method for optimizing the efficiency of bidirectional converters in a microgrid energy storage system. Background technique [0002] As the key to connect the microgrid bus and each distributed energy module, the bidirectional converter is the core device of the energy storage system. With the demand for high-efficiency and large-capacity bidirectional converters in large-scale energy storage systems, and the maturity of high-voltage battery technology, in recent years, many scholars have applied interleaved parallel non-isolated bidirectional topologies to new energy power generation systems, and achieved excellent results. However, due to the diversification of the energy input of the microgrid system, the load in its island operation mode is complex and changeable. If the multi-phase parallel operation of the converter is under light load conditions, the large switching ...

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Application Information

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IPC IPC(8): H02J3/32H02M3/158
CPCH02J3/32H02M3/1582H02M3/1584H02J2203/20H02M3/1586
Inventor 郭瑞王磊韩冬
Owner LIAONING TECHNICAL UNIVERSITY
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