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Category: Basic knowledge of IGBT three-phase SPWM inverter

the following will learn basic knowledge of IGBT three-phase SPWM inverter

What is the cascade superposition of independent DC power supply?

How to realize the superposition of independent DC power supply? What are the hard core conditions?

Posted on April 12, 2022April 28, 2022 by admin

The cascade superposition of independent DC power supply is realized by using the unidirectional conductivity of superposition diode. Its principle circuit includes (a) the main circuit and (b) the control circuit. (a) In, E1 ~ en are n independent DC power supplies, S1 ~ Sn are superposition control switches, VD1 ~ vdn are superposition diodes,…

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What are the advantages of cascading stacked multilevel inverters for independent SPWM DC power supplies?

What are the advantages of cascading stacked multilevel inverters for independent SPWM DC power supplies?

Posted on March 24, 2022March 24, 2022 by admin

There are two types of existing SPWM multilevel inverters: one is a clamped multilevel inverter (including diode clamping, capacitor clamping and hybrid clamping multilevel inverters), which are typically The control method is the carrier triangular wave stacked SPWM control method; the other is the H-bridge cascaded multi-level inverter, and its typical control method is the…

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What is a three-phase full-bridge SPWM inverter?

What is a three-phase full-bridge SPWM inverter?

Posted on March 17, 2022March 17, 2022 by admin

For large-capacity three-phase UPS, a high-power three-phase SPWM inverter needs to be selected. Due to the substantial improvement of the power level, new requirements are put forward for the structure of the three-phase SPWM inverter. Using a single-phase full-bridge inverter (2H bridge) as a bridge arm of a three-phase SPWM inverter is one of the…

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What is a three-phase four-arm VSV-PWM inverter?

What is a three-phase four-arm VSV-PWM inverter?

Posted on March 9, 2022March 9, 2022 by admin

The voltage space phasor pulse width control technology of the three-phase four-leg inverter, namely the three-phase four-leg VSV-PWM inverter, will be introduced. The main circuit of the three-phase four-arm inverter is shown in Figure 1. It is composed of a three-phase half-bridge inverter and a bridge arm formed by a neutral point (composed of switch…

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What is the state space modulation mapping method of three-phase half-bridge SPWM inverter VSV-PWM?

What is the state space modulation mapping method of three-phase half-bridge SPWM inverter VSV-PWM?

Posted on February 28, 2022February 28, 2022 by admin

The three-phase half-bridge SPWM inverter VSV-PWM state space modulation mapping method is also called the six-step PWM mapping method. It is a drawing method that makes the magnetic flux trajectory tend to be circular, or a method of finding the magnetic flux trajectory using the drawing method. The basic idea is to use numerical control…

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Voltage space phasor representation of three-phase half-bridge SPWM inverter

Voltage space phasor representation of three-phase half-bridge SPWM inverter

Posted on February 8, 2022February 8, 2022 by admin

The voltage space phasor representation is a method that directly combines the SPWM and the circular trajectory of the motor flux linkage, which was proposed by J.Holtz in 1983. According to the principles of electrical engineering, the sine quantity can be represented by a complex number, that is, it can be represented by the projection…

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What is a three-phase four-leg SPWM inverter?

What is a three-phase four-leg SPWM inverter?

Posted on January 24, 2022January 24, 2022 by admin

There are two output forms of three-phase inverter: one is three-phase three-wire output; the other is three-phase four-wire output. Ordinary inverters are three-phase three-wire output, that is, only line voltage can be output. In order to obtain the phase voltage output, that is, to convert the ordinary three-phase inverter into a three-phase four-wire system output,…

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What are the control methods of the three-phase half-bridge SPWM inverter?

What are the control methods of the three-phase half-bridge SPWM inverter?

Posted on January 13, 2022January 13, 2022 by admin

There are two control methods for the three-phase half-bridge SPWM inverter: one is to use the complementary switches of the same bridge arm to perform SPWM control according to the waveforms of the phase voltages uA, uB, and uC. This control method is derived from the early inverter control method using the half-controlled switching device…

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Ripple current caused by three-phase four-wire inverter and its compensation

Ripple current caused by three-phase four-wire inverter and its compensation

Posted on January 10, 2022January 13, 2022 by admin

A circuit form of a three-phase four-wire inverter is shown in Figure 1. This is a four-wire output inverter that uses the midpoint of the DC input supply voltage as the neutral point. For a balanced linear load, the neutral current is equal to zero; but for unbalanced and nonlinear loads, there is a zero-sequence…

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The pulsating current caused by the three-phase three-wire inverter and its compensation

The pulsating current caused by the three-phase three-wire inverter and its compensation

Posted on January 5, 2022January 5, 2022 by admin

The three-phase three-wire inverter circuit using the output filter is shown in Figure 1. When the SPWM control method is adopted, the Fourier series expansion of 3 symmetric switching functions (interface signals) is Using SPWM control, when n=3,5,7,11,13, An=0 can be set, then the inverter output line voltage is In the formula, Ud is the…

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Categories

  • Basic knowledge of IGBT three-phase SPWM inverter
  • Basic knowledge of uninterruptible power supply
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AC filter circuit backup UPS Basic circuit of single-phase PWM inverter Basic structure of IGBT Cascade superposition of independent DC power supply Compensation for the influence of dead zone Composition of three-phase full-bridge SPWM inverter computer power Control method of the three-phase four-leg inverter current crest factor Development of inverter technology Double Fourier series analysis High frequency UPS industrial frequency UPS influence of dead zone on output voltage Influence of unbalanced load on DC input current fluctuation Instantaneous space current phasor control method using hysteresis comparator Inverter technology mains grid nature of the load Power frequency UPS power supply quality issues Precautions for using SCR PWM technology SCR multi-phase phase controlled rectifier SCR power switch time single phase capacitor filter rectifier space flux linkage phasor SPWM control SPWM control method SPWM modulation waveform SPWM soft-switching inverter technology Synchronous SPWM modulation The third generation UPS Three-phase half-bridge inverter Thyristor rectifier Transformer in UPS Two-level SPWM inverter Types of spwm multilevel inverters UPS applications Use gate resistance to control IGBT switch Various control methods of ups Working principle of the three-phase four-leg inverter Working principle of three-phase full-bridge SPWM inverter Working principle of three-phase half-bridge SPWM inverter
ups uninterruptible power supply is a UPS power supply that contains energy storage devices, which can be classified according to the characteristics of transformers and the structure of ups electrical circuit.