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Carrier hybrid pulse width modulation strategy control method of modular multilevel converter

A modular multi-level, hybrid pulse width modulation technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problems of high switching frequency and large switching loss, and achieve Low switching frequency, low switching loss, and slow switching cycle

Pending Publication Date: 2022-08-05
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the amplitude of the carrier wave is always greater than or equal to the amplitude of the modulation wave, compared with the pulse width modulation technology based on multi-carrier, the switching frequency of carrier phase-shift modulation is higher, and the switching loss is also greater than that of the pulse width modulation method based on multi-carrier

Method used

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  • Carrier hybrid pulse width modulation strategy control method of modular multilevel converter
  • Carrier hybrid pulse width modulation strategy control method of modular multilevel converter
  • Carrier hybrid pulse width modulation strategy control method of modular multilevel converter

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Embodiment 1

[0051] refer to Figures 1 to 5 , which is the first embodiment of the present invention, which provides a method for controlling a carrier hybrid pulse width modulation strategy of a modular multilevel converter.

[0052] The MMC sub-module trigger pulse signal is obtained by comparing with the reference signal;

[0053] Based on the CCSC technology, the carrier signal is adjusted.

[0054] The acquisition method of the reference signal includes,

[0055] The MMC obtains the reference voltage on each bridge arm through the power inner loop, the voltage outer loop and the circulating current suppression loop;

[0056] Secondly, after the reference voltage is multiplied by the proportional coefficient, it is compared with the proposed new carrier mixed pulse width carrier to obtain a pulse signal.

[0057] Periodically configure the obtained pulse signal;

[0058] Finally, the obtained pulse signals are respectively corresponding to the sub-modules in the MMC.

[0059] Acc...

Embodiment 2

[0078] refer to Figures 6 to 9 , is the second embodiment of the present invention, which is based on the previous embodiment.

[0079] The converter is MMC, and its internal control method is realized by switching the IGBT on the internal sub-module, and the source of the IGBT switching signal is the control method of the MMC. The inner and outer loop control just forms a PI closed loop in the control structure. The inner loop controls the current, the outer loop controls the voltage, and more is the control of the signal. That is to say, MMC externally expresses the control of energy, and internally it is the control of MMC by the inner and outer loops, and the inner and outer loops are both internal control signals, which are a whole to control the MMC.

[0080] The direct power control strategy includes: by collecting the AC side line voltage, through abc / dq transformation, the component of the AC side voltage on the dq axis is obtained, and the reference active and reac...

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Abstract

The invention discloses a carrier hybrid pulse width modulation strategy control method for a modular multilevel converter, which comprises the following steps of: comparing with a reference signal to obtain a trigger pulse signal of an MMC (Modular Multilevel Converter) sub-module; on the basis of the CCSC technology, carrier signals are adjusted; the reference signal acquisition method comprises the following steps: the MMC obtains reference voltage on each bridge arm through a power inner ring, a voltage outer ring and a circulating current suppression ring; secondly, after the reference voltage is multiplied by a proportionality coefficient, the reference voltage is compared with a proposed novel carrier wave mixed pulse width carrier wave, and a pulse signal is obtained. According to the characteristics of the carrier wave, the ripple wave of the capacitor voltage of the MMC sub-module is smaller compared with a carrier wave stacking technology through theoretical simulation under the condition that the modulation wave is an ideal sine wave; compared with a carrier phase-shifting technology, the MMC is smaller in switching frequency and switching loss.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method for controlling a carrier hybrid pulse width modulation strategy of a modular multilevel converter. Background technique [0002] With the rapid development of my country's economy, the consumption of electric energy is increasing, and energy problems are becoming more and more prominent, which prompts people to develop in the direction of cleaner and more efficient renewable energy. However, such as wind energy, solar energy and other renewable energy sources are generally located in remote areas or require Occupying a large geographical space, the development has great limitations. Therefore, how to connect these new energy sources to the power transmission and distribution network through a stable and reliable circuit topology has become a key topic of current research. Among the many converters, the modular multilevel converter (MMC) has the advantages of hi...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M7/5387H02M7/5395
CPCH02M7/483H02M7/5395H02M7/53871Y02E60/60
Inventor 杨兴武丁青杰王雅妮徐常天王江鲍一鸣张亚楠刘春薛花
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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