Virtual vector optimizing and neutral-point potential balancing closed-loop control system of multilevel inverter

A multi-level inverter and potential balancing technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the unbalanced voltage division of the midpoint potential of the DC side voltage dividing capacitor Capacitance and other issues

Inactive Publication Date: 2015-06-17
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

In addition, there are factors such as the modulation strategy, the manufacturing process of the voltage dividing capacitor, and the load condition that lead to the unbalanced potential of the midpoint of the DC side voltage dividing capacitor.

Method used

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  • Virtual vector optimizing and neutral-point potential balancing closed-loop control system of multilevel inverter
  • Virtual vector optimizing and neutral-point potential balancing closed-loop control system of multilevel inverter
  • Virtual vector optimizing and neutral-point potential balancing closed-loop control system of multilevel inverter

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Experimental program
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Embodiment Construction

[0020] As shown in the figure, the multilevel inverter optimizes the virtual vector midpoint potential balance closed-loop control system:

[0021] Step 1. Signal conditioning: the three-phase voltage and current components of the inverter output terminal obtained by sensor sampling, and the voltage value of the DC side voltage dividing capacitor are filtered through the detection circuit to remove the disturbing glitch signal;

[0022] Step two, the design of the controller:

[0023] a. Find the amount of compensation : Input the signal obtained in step 1 into the DSP for A / D conversion, and after digital quantization, the voltage of the dividing capacitor To process, get the offset of the midpoint potential respectively and DC side bus voltage value , and the offset is compensated by a low-pass compensator , and by and compare the amount of error , after the processing of the compensator, we can get expectations ;

[0024] b. Reference voltage vector angl...

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Abstract

The invention discloses a virtual vector optimizing and neutral-point potential balancing closed-loop control system of a multilevel inverter. Through signal conditioning, controller designing and modulator designing, effective control for neutral-point voltage fluctuation of a capacitor at a direct-current side is realized, and thus the damage to a switch tube and the harmonic distortion of output voltage due to different voltage stresses borne by the switch tube can be prevented.

Description

technical field [0001] The invention belongs to the field of high-voltage and high-power AC frequency conversion speed regulation, and relates to a closed-loop system solution suitable for midpoint potential balance control of clamping multilevel inverters. Background technique [0002] Due to its own topological structure, the clamped multilevel inverter has low-frequency oscillation of the capacitor voltage on the DC side, which will increase the voltage stress on the switch tube and include low-frequency harmonics in the output voltage. In addition, factors such as the modulation strategy, the manufacturing process of the voltage-dividing capacitor, and the load condition cause the unbalanced potential of the midpoint of the voltage-dividing capacitor on the DC side. At present, there are two ways to solve the midpoint potential balance problem of the DC side: hardware way and software way. The hardware method is to make some changes in the circuit topology, for example:...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14H02M7/487
Inventor 范波刘跃敏许惠赵伟刚
Owner HENAN UNIV OF SCI & TECH
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