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A quasi-two-level pwm control method for modular multilevel converters based on sic devices

A modular multi-level and control method technology, which is applied in the direction of high-efficiency power electronic conversion, output power conversion device, AC power input conversion to DC power output, etc., can solve the problems of increasing the size and cost of the device, and achieve reduction Volume, cost reduction, effect of reduced requirements

Active Publication Date: 2018-11-13
NANJING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

Although MMC can reduce the voltage requirements of power devices through modular design, in order to meet some high voltage level applications, too many sub-modules may be required, which also increases the size and cost of the device

Method used

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  • A quasi-two-level pwm control method for modular multilevel converters based on sic devices
  • A quasi-two-level pwm control method for modular multilevel converters based on sic devices
  • A quasi-two-level pwm control method for modular multilevel converters based on sic devices

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Experimental program
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Embodiment Construction

[0015] figure 1 It is the topology and working principle diagram of the module multilevel converter, such as figure 1 As shown in (a), the modular multilevel converter has a three-phase structure. Each phase is composed of two identical bridge arms. Each bridge arm is composed of N sub-module inductors connected in series. Each sub-module has the same structure. Both consist of a half-bridge structure of SIC-based power devices with anti-parallel diodes and a DC capacitor C. Compared with power devices made of traditional materials, power devices based on SIC materials have a higher withstand voltage level and switching frequency, so that the device can be used in higher voltage level applications. Since the three-phase structure of the module multilevel converter is exactly the same, for the convenience of description, one phase is selected for analysis. figure 1 (b) is the single-phase equivalent circuit diagram of the modular multilevel converter, where u jp , u jn are ...

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Abstract

The invention discloses a modular multilevel converter quasi-two-level PWM control method based on an SIC device. The method comprises the steps of determining a reference value of output voltage anda duty ratio of an output PWM modulator by current control, determining a PWM switching state time signal according to the duty ratio D of the PWM modulator, determining a circulation reference valueaccording to a PWM switching state and an energy reference value, determining a compensation voltage reference value according to a circulation actual value and the circulation reference value, and finally superposing the compensation voltage reference value on the reference voltage to obtain an output voltage modulation signal, and carrying out delay PWM modulation to obtain each bridge arm sub-module PWM control signal to realize the control of each sub-module of a modular multi-level converter. According to the method, a phenomenon of excessive output voltage is effectively prevented, the voltage fluctuation of a modular multilevel converter sub-module capacitor is reduced, requirements of energy storage of the sub-module capacitor are reduced, the volume of the modular multilevel converter is further reduced, and the cost of the modular multilevel converter is reduced.

Description

technical field [0001] The invention relates to the control technology of power electronics, in particular to a quasi-two-level PWM control method for a modular multilevel converter based on a SIC device. Background technique [0002] Power electronic converter is the core device of electric energy conversion, and has been widely used in all aspects of electric energy production, transmission, distribution and use. The gradual advancement of the industrialization process has made people's utilization of electric energy more in-depth, and the requirements for power electronic converters have become higher and higher, which in turn has promoted the continuous development of power electronic technology. In recent years, the application of advanced power electronic technologies such as flexible AC transmission (FACT)), high voltage direct current transmission (HVDC), large-scale distributed new energy generation and grid connection in the power system has been increasingly appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/00H02M7/483H02M7/5387H02M1/32
CPCH02M1/32H02M7/00H02M7/483H02M7/5387Y02B70/10
Inventor 季振东赵志宏宋杰赵剑锋吕建国姚佳刘钊
Owner NANJING UNIV OF SCI & TECH
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