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DC voltage balance control strategy for unidirectional cascaded multilevel power electronic converters

A DC voltage, power electronics 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 limited adjustment range, slow voltage adjustment speed, etc., and achieve good real-time control. , the effect of short control delay and low implementation cost

Active Publication Date: 2018-12-18
CHINA UNIV OF MINING & TECH (BEIJING)
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AI Technical Summary

Problems solved by technology

However, due to the existence of the integral link in the PI regulator, the voltage regulation speed of this method is slow and the regulation range is limited.

Method used

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  • DC voltage balance control strategy for unidirectional cascaded multilevel power electronic converters
  • DC voltage balance control strategy for unidirectional cascaded multilevel power electronic converters
  • DC voltage balance control strategy for unidirectional cascaded multilevel power electronic converters

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Embodiment

[0056] refer to figure 2 , the present invention is applied to three-stage cascaded single-phase VIENNA converters. The three-stage cascaded single-phase VIENNA converter is a kind of cascaded single-phase unidirectional converter, which is formed by cascading three single-phase VIENNA converters.

[0057] The steps of the DC voltage balance control strategy of the unidirectional cascaded multi-level power electronic converter of the present invention are as follows:

[0058] (1) Sampling the DC voltages of the three single-phase VIENNA converters in the three-level cascaded single-phase VIENNA converters to obtain three DC voltage signals U d1 , U d2 and U d3 ;

[0059] (2) The three DC voltage signals U in step (1) d1 , U d2 and U d3 Send it to the summation module to get the total output DC voltage signal U d for:

[0060]

[0061] where U dn is the DC voltage signal of the nth single-phase unidirectional converter of the cascaded single-phase unidirectional c...

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Abstract

A DC voltage balance control strategy for cascade multi-level pow electronic converter with single-direction energy flow is compose of sequencing module, matching module, operation module and modulation wave generation module. The invention improves the traditional one-cycle control, in addition to the advantages of not changing the use of a phase locked loop for one cycle control and the use of avoltage sensor for the ac side, Compared with the DC voltage balance control strategy based on traditional PI control, the adjustable speed is fast, Advantages of wide adjustment range, when the unbalance of DC voltage of cascaded multi-level power electronic converters with one-way energy flow is large, the unbalance of DC voltage of cascaded multi-level power electronic converters with one-wayenergy flow is large, The method of the invention can make the cascade multi-level power electronic converter with energy flow in one direction to regulate the DC voltage of each stage at the maximumrate to keep the balance, and make the AC side of the whole circuit run under the condition of low harmonic and high power factor.

Description

technical field [0001] The invention relates to the field of DC voltage balance control of cascaded multilevel power electronic converters, in particular to a DC voltage balance control strategy for cascaded multilevel power electronic converters in which energy flows in one direction. Background technique [0002] The cascaded multilevel power electronic converter is a converter that connects traditional power electronic converters in a cascaded manner. Compared with non-cascaded power electronic Since the power electronic converter can generate multiple levels, it can better control the waveform and power quality. In addition, the cascaded power electronic converter can also be applied to high-voltage and large-capacity occasions, and the withstand voltage level of the device can be reduced by cascading. [0003] However, in the cascaded multilevel power electronic converters, due to the differences in the parameters of the power electronic converters at all levels, espec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/515H02M7/537
CPCH02M7/515H02M7/537H02M1/007
Inventor 程红王聪胡昊雨刘瑨琪赵志浩张莹卢其威邹甲
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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