Fault-tolerant control method of twelve-sector two-level pwm rectifier 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 inability to achieve optimal proportional compensation, poor fault-tolerant compensation effect, and inability to separate, and achieve three-phase current Effects of THD improvement and motor speed fluctuation improvement

Active Publication Date: 2022-01-11
NANJING UNIV OF SCI & TECH
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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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  • Fault-tolerant control method of twelve-sector two-level pwm rectifier based on genetic algorithm
  • Fault-tolerant control method of twelve-sector two-level pwm rectifier based on genetic algorithm
  • Fault-tolerant control method of twelve-sector two-level pwm rectifier 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 fault-tolerant control method of a twelve-sector two-level PWM rectifier based on a genetic algorithm, which determines the sector where the reference voltage vector is located, selects two adjacent effective vectors in the sector where the reference voltage is located, and forms a follow-up control with the zero vector Basic voltage vector; determine the modulus length, angle and total action time of the reference voltage vector when the system is running; optimize the goal by minimizing the difference between the system’s real-time reference voltage vector action time and angle and the calculated value, establish a fitness function, and determine Based on the system constraints, the optimal control model is obtained; the optimal control model is solved based on the genetic algorithm, and the optimal basic voltage vector action time is obtained; the conduction time of the three-phase switch is determined; the conduction time of the switch is modulated with the triangular carrier wave, Determine the switching tube PWM pulse to control the switching tube on and off, and complete the genetic algorithm fault-tolerant control. The invention accurately compensates the sector affected by the fault, and at the same time reduces the negative impact.

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 Patents(China)
IPC IPC(8): H02M7/219H02M1/088H02M1/32G06N3/12
CPCH02M7/219H02M1/088H02M1/32G06N3/126
Inventor 冯延晖徐晨邱颖宁施耀华任铭黄光远
Owner NANJING UNIV OF SCI & TECH
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