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Twelve-sector two-level PWM rectifier fault-tolerant control method based on genetic algorithm

A genetic algorithm and fault-tolerant control technology, which is applied in the field of fault-tolerant control of twelve-sector two-level PWM rectifiers, can solve problems such as poor fault-tolerant compensation effects, inability to separate, and inability to achieve optimal proportional compensation.

Active Publication Date: 2021-03-19
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned software-based fault-tolerant control method can not realize the optimal proportional compensation because only the space vector that is not affected by the open-circuit fault is used to synthesize the reference voltage space vector, and in the case of multi-tube faults, it is impossible to switch the faulty switch tubes. The affected area is separated from the normal area, and the fault tolerance and compensation effect is poor

Method used

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  • Twelve-sector two-level PWM rectifier fault-tolerant control method based on genetic algorithm
  • Twelve-sector two-level PWM rectifier fault-tolerant control method based on genetic algorithm
  • Twelve-sector two-level PWM rectifier fault-tolerant control method based on genetic algorithm

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Embodiment approach

[0125] As a preferred embodiment, the present invention realizes the control method based on the form of DSP+FPGA, wherein the DSP is used to collect the reference voltage vector and transmit it to the FPGA, and then the FPGA determines the optimal basic voltage vector action time based on the genetic algorithm and transmits it to the DSP, and finally The DSP determines the switching tube PWM pulse according to the optimal basic voltage vector action time, and controls the switching tube on and off, specifically:

[0126] The clock frequency is 150MHz, the high-performance 32-bit floating-point central processor TMS320F28335 is the main controller, and the sampling circuit is controlled to collect the reference voltage vector angle in real time, and the data is transmitted through the connection between RS232 and FPGA. The baud rate is 115200. Work mode, sending mode as shown in Table 3:

[0127] Table 3 Angle sending method

[0128]

[0129] Select Terasic Alter FPGA DE2-...

Embodiment

[0144] In order to verify the effectiveness of the solution of the present invention, this embodiment mainly performs simulation analysis on the open circuit fault of the power switch tube S1, image 3 It is a system control flow chart, which specifically includes the following steps:

[0145] 1. Sector division: such as figure 2 As shown, when an open-circuit fault occurs in S1, the left half of the sector is affected.

[0146] 2. Data acquisition when the system is running: such as figure 1 As shown, firstly, for the permanent magnet synchronous generator abc three-phase current i a i b i c Sampling, the three-phase current angle θ is obtained through the encoder, and the current component i in the two-phase rotating coordinate system (dq) is obtained after coordinate transformation d , i q . i d , i q with a given i dref , i qref The deviation of U is obtained after the current loop control d , U q ; d and U q After coordinate transformation, the two-phase ...

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Abstract

The invention discloses a twelve-sector two-level PWM rectifier fault-tolerant control method based on a genetic algorithm. The method comprises steps of determining a sector where a reference voltagevector is located, selecting two adjacent effective vectors of the sector where a reference voltage is located, and forming a basic voltage vector of subsequent control with a zero vector; determining the reference voltage vector module length, the angle and the total action time when the system runs; establishing a fitness function by taking minimization of the difference between the action timeand angle of the real-time reference voltage vector of the system and the calculated value as an optimization target, and determining a system constraint condition to obtain an optimization control model; solving the optimization control model based on a genetic algorithm to obtain optimal basic voltage vector action time; determining the conduction time of the three-phase switch tube; and modulating the conduction time of the switching tube and the triangular carrier wave, determining the PWM pulse of the switching tube to control the on-off of the switching tube, and completing the fault-tolerant control of the genetic algorithm. According to the method, the negative influence is reduced while accurate compensation is carried out on the fault influence sector.

Description

technical field [0001] The invention relates to a rectifier open-circuit fault fault-tolerant technology, in particular to a fault-tolerant control method of a twelve-sector two-level PWM rectifier based on a genetic algorithm. Background technique [0002] In recent years, with the rapid development of the power electronics industry, power conversion technology has gradually been applied in new energy vehicles, wind power generation, solar power generation and other fields. In actual working conditions, the three-phase converter is a relatively weak link. As the most important component in the machine-side converter, the power switch tube has always ranked first in failure rate. Therefore, in order to improve the ability of the system to run stably after the open-circuit fault of the power switch tube, the fault-tolerant control technology of the converter has become a current research hotspot. [0003] At present, the fault tolerance of open-circuit faults of power switch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/088H02M1/32G06N3/12
CPCH02M7/219H02M1/088H02M1/32G06N3/126
Inventor 徐晨冯延晖邱颖宁任铭黄光远
Owner NANJING UNIV OF SCI & TECH
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