Fault-tolerant modulation method of common-bus-structure and double-end-cascade type five-level inverter

A modulation method and inverter technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the problems that there is no research on fault-tolerant modulation methods for five-level inverters

Inactive Publication Date: 2015-04-29
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Some scholars have studied the fault-tolerant modulation method of double-ended cascaded three-level inverters with common bus structure, but ther

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  • Fault-tolerant modulation method of common-bus-structure and double-end-cascade type five-level inverter
  • Fault-tolerant modulation method of common-bus-structure and double-end-cascade type five-level inverter

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[0008] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0009] like figure 2 As shown, the common-mode voltage and zero-sequence voltage generated by the space vector in the figure are both zero, and the linear modulation area is the inscribed hexagon of the normal area. Taking phase A as an example, when the upper bridge arm of phase A of inverter 1 and the lower bridge arm of phase A of inverter 2 at most four switching devices trigger loss and open circuit, only three space vectors K, L, and M can In normal use, when in the three states of K, L, and M, the voltage of phase A is - V dc / 2, after the motor inductance freewheels, the phase A voltage is V dc / 2. Since the B-phase and C-phase switching devices are normal, the three space voltage vectors of G, Q, and R can be reconstructed at this time. Using the above six vectors, combined with the SVPWM algorithm based on the g-h coor...

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Abstract

The invention relates to a fault-tolerant modulation method of a common-bus-structure and double-end-cascade type five-level inverter. The method is characterized in that motor inductor energy accumulation and inductor follow current features are utilized to allow part of spatial vectors to be reusable, the spatial vectors with the amplitude of Vdc/2 are used to reconstruct the spatial vectors having the same amplitude of Vdc/2, the reconstructed spatial vectors are used to synthesize reference voltage vectors, and common-mode voltage and zero-sequence voltage are eliminated while fault-tolerant operation of the double-end-cascade type inverter is achieved. The method has the advantages that fault-tolerant operation of a common-bus-structure and double-end-cascade type five-level inverter system when two inverters of the system fail can be achieved, and meanwhile, maximum output voltage keeps unchanged.

Description

technical field [0001] The invention relates to a fault-tolerant modulation method of an inverter, in particular to a fault-tolerant modulation method of a double-end cascaded five-level inverter with a common bus structure. Background technique [0002] Compared with the standard three-phase motor, the double-terminal three-phase open-winding motor has a higher output voltage level and has high fault tolerance, which is a topology with broad application prospects. Fault tolerance is very important in transmission occasions that require high reliability, such as electric vehicles, ship drives, and mine hoists. Double-ended cascaded five-level inverter with common bus structure Since two inverters only need one set of DC bus system, equipment cost and volume can be effectively reduced. Some scholars have studied the fault-tolerant modulation method of double-ended cascaded three-level inverters with common bus structure, but there is no fault-tolerant modulation method for d...

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Application Information

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IPC IPC(8): H02M7/483
Inventor 杜朋钟志祥童为为邵祥
Owner CHINA UNIV OF MINING & TECH
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