Loss Optimal Control Method of Modular Multilevel Converter Based on Circulation Current Injection
A modular multi-level, optimized control technology, applied in the direction of conversion of AC power input to DC power output, output power conversion device, electrical components, etc., can solve the problem of limited application, increased control algorithm complexity, Improve the reliability, increase the construction cost, and enhance the practicality
Active Publication Date: 2022-07-19
SOUTHEAST UNIV
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] Aiming at the loss optimization control problem of modular multilevel converters, conventional methods reduce the loss of modular multilevel converters by changing the topology of sub-modules, dynamically adjusting the switching frequency of sub-modules, or changing the modulation strategy of modular multi-level converters. However, the above method has problems such as increased construction cost of the modular multilevel converter, affecting the output power quality of the modular multilevel converter, and increasing the complexity of the control algorithm, which limits the application of the above method in actual engineering.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0041] Aiming at the loss optimization control problem of modular multilevel converters, a loss optimization control method of modular multilevel converters based on circulating current injection is proposed. The topology of the three-phase modular multilevel converter (MMC) is as follows figure 1 As shown, the topology of the submodule (SM) is as follows figure 2 shown. The three-phase MMC is composed of six bridge arms, each bridg...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a loss optimization control method for a modular multi-level converter based on circulating current injection, which comprises the following steps: using the active power and reactive power of the modular multi-level converter to obtain an AC side current; using the modular multi-level converter to obtain an AC side current; The DC side current is obtained by power conservation; within the range of the amplitude and phase angle of the injected secondary circulating current and the fourth circulating current, the total loss of the modular multi-level converter sub-module is obtained by using the bridge arm current, and the calculation result is calculated. Construct the sub-module total loss data set; find the amplitude and phase angle of the secondary circulation and quaternary circulation corresponding to the minimum total loss value in the data set, and inject the optimal secondary circulation and quaternary circulation into the modular multi-circuit at the same time. In the three-phase bridge arm of the flat converter, the loss reduction of the modular multi-level converter is realized. The invention realizes the reduction of the loss of the modular multi-level converter, does not need to increase the construction cost of the modular multi-level converter and does not affect the output power quality of the modular multi-level converter compared with the conventional method.
Description
technical field [0001] The invention belongs to the field of multi-level power electronic converters, in particular to a loss optimization control method of a modular multi-level converter based on circulating current injection. Background technique [0002] Modular Multilevel Converter (MMC) can realize any level output by adjusting the number of cascaded sub-modules. Compared with traditional two-level and three-level converters, it has a high degree of modularity, output It has the advantages of high voltage waveform quality and no need for multi-winding phase-shifting transformers. [0003] Since the modular multi-level converter contains a large number of sub-modules, during the normal operation of the modular multi-level converter, the losses caused by the power switches and diodes in the sub-modules cannot be ignored. However, excessive losses will affect the module. The reliability of the modularized multilevel converter will be affected, and the stable operation of...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483
Inventor 邓富金蒋鹏远赵纪峰
Owner SOUTHEAST UNIV