Feedforward decoupling control method based on three-phase two-arm tri-level active power quality compensator

A technology of power quality and feed-forward decoupling, applied to AC networks to reduce harmonics/ripples, harmonic reduction devices, etc., can solve high surge voltage, unbearable high voltage, large device voltage stress and switching loss, etc. question

Active Publication Date: 2011-10-12
HUNAN UNIV
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Problems solved by technology

Due to the high-voltage demand for high-power compensation devices is extremely eager and urgent, the traditional two-level PWM inverter obviously cannot withstand the high voltage on the DC side relying on a single switching tube.
In addition to high-voltage defects, traditional two-level inverters also have the following problems: 1) High frequency generates high dv / dt and surge voltage, causing insulation breakdown of motor windings; 2) High-frequency switching produces large components Voltage stress and switching loss reduce efficiency; 3) The harmonic content of the inverter output waveform is relatively large

Method used

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  • Feedforward decoupling control method based on three-phase two-arm tri-level active power quality compensator
  • Feedforward decoupling control method based on three-phase two-arm tri-level active power quality compensator
  • Feedforward decoupling control method based on three-phase two-arm tri-level active power quality compensator

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Embodiment Construction

[0043] The structure diagram of ordinary three-level diode clamped inverter is as follows: figure 1 shown. figure 1 It consists of a diode-clamped three-level inverter module 1 and three output reactors 2 . It consists of twelve power switching devices and six diodes, and the withstand voltage of the power semiconductor devices is half of the DC bus voltage. Ordinary NPCTLI will generate five voltage levels at the AC side terminal voltage, and the output waveform distortion is small, but it uses too many power devices and the cost is high.

[0044] A three-level active power quality compensator based on three-phase two-arm figure 2 shown. figure 2 It is composed of three output reactors 2, a three-level inverter 3 and a voltage equalizing circuit 4 on the DC side. figure 2 Among them, the A-phase three-level switching arm of the three-phase inverter is composed of the upper pair of switching tubes T a1 and T a2 , the next pair of switching tubes T′ a1 and T' a2 and ...

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Abstract

The invention discloses a feedforward decoupling control method based on a three-phase two-arm tri-level active power quality compensator. For the purpose of realizing reactive compensation, negative sequence compensation and harmonic compensation, one two-input and two-output coupling system is decoupled into two independent single-input single-output systems, thus quickly tracking current and improving reliability of the system; and a corresponding PWM (pulse width modulation) method is adopted to drive a switching tube to acquire an expected current. The feedforward decoupling deadbeat control method based on the three-phase two-arm tri-level active power quality compensator can be used to realize complete compensation and inhibition of the negative sequence and harmonic waves of the systems.

Description

technical field [0001] The invention belongs to the technical field of negative sequence and harmonic real-time detection methods and control methods, and in particular relates to a feedforward decoupling current closed-loop control method based on a three-phase two-arm three-level active power quality compensator. Background technique [0002] With the development of social industry, the operation of high-voltage and high-power loads in railway transportation, mining metallurgy and petroleum and petrochemical industries will generate a large amount of reactive power, negative sequence and harmonic currents, which will be used for power generation, transmission and transformation in the power system. The operation of the equipment brings serious harm, increases the loss of the system, reduces the output of the transformer, etc., which seriously affects the safe and economical operation of the power system. Therefore, effective measures must be taken to suppress power quality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 罗安马伏军帅智康吕志鹏谢宁刘芸邓才波
Owner HUNAN UNIV
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