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Three-phase rectification type power electronic transformer and DC voltage coordinative control method thereof

A technology of power electronics and three-phase rectification, which is applied in the direction of converting AC power input to DC power output, adjusting electrical variables, and controlling/regulating systems. It can solve problems such as not fully meeting new requirements and single functions, and achieve simple and convenient implementation , improve reliability, and simplify the effect of the control system

Inactive Publication Date: 2016-05-11
SOUTHEAST UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

As the most important device in the power system, the power transformer has too simple a function to fully meet the new requirements of the modern power system.

Method used

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  • Three-phase rectification type power electronic transformer and DC voltage coordinative control method thereof
  • Three-phase rectification type power electronic transformer and DC voltage coordinative control method thereof
  • Three-phase rectification type power electronic transformer and DC voltage coordinative control method thereof

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Embodiment Construction

[0034] Such as figure 1 As shown, the three-phase rectifying power electronic transformer of the present invention includes a three-phase cascaded H-bridge converter 1, a multi-DAB (Dual Active Bridge dual active bridge) output parallel system 2, a three-phase current decoupling control 3, and a total DC Voltage control 4 and input voltage equalization control 5 of multi-DAB parallel system.

[0035] Among them, the three-phase cascaded H-bridge converter 1 and the multi-DAB output parallel system 2 are connected to each other through multiple DC sides, and each phase includes n sub-modules, where n is a positive integer.

[0036] Total DC voltage control 4 is used to collect all H-bridge DC side voltage u dcxi , so as to obtain the command active current value Among them, x represents the difference (take A, B, C), and i represents the unit number (take 1~n);

[0037] Three-phase current decoupling control 3 is used to collect the AC side A, B, C three-phase voltage e A,...

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Abstract

The invention discloses a three-phase rectification type power electronic transformer and a DC voltage coordinative control method thereof. The transformer comprises a three-phase cascaded H-bridge converter, a multi-DAB output parallel system, a three-phase current decoupling controller, a total DC voltage controller and an input voltage balancing controller of the multi-DAB output parallel system which are connected with one another by a multi-DC side. According to the control method, a two-stage coordinative control mode is adopted, an input stage is used for controlling an average value of a grid-side current and a multi-DC voltage, and an output stage is used for balancing the multi-input DC voltage and controlling the output voltage. The transformer and the control method are simple and convenient to implement, and the astatic control of the grid-side current can be achieved; a current sensor is unnecessarily arranged for the output of each DAB module, and thus, the hardware cost is reduced. With the transformer and the control method, a control system is simplified, the multi-DC voltage balance and multi-DAB power balance are achieved, and meanwhile, the system reliability is further enhanced.

Description

technical field [0001] The invention relates to a rectifying power electronic transformer and a multi-DC voltage coordinated control method, belonging to the technical field of DC voltage control of multi-level converters in high-voltage and high-power occasions. Background technique [0002] With the development of smart grid, more and more renewable energy is connected to the grid, which puts forward higher requirements on the power quality, stability and flexibility of the power system. As the most important device in the power system, the power transformer cannot fully meet the new requirements of the modern power system because of its single function. Therefore, the rise of power electronics technology provides an opportunity for the formation and development of new power electronic transformers. The power electronic transformer realizes isolated AC / AC conversion through power electronic devices and medium and high frequency transformers. It can not only complete the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M3/335
CPCH02M7/219H02M3/33576
Inventor 王建华季振东赵剑锋
Owner SOUTHEAST UNIV
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