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Category: SCR polyphase phase controlled power frequency rectifier and three-phase boost single switch SPWM PFC rectifier

Detailed explanation of harmonic injection three-phase boost single-switch SPWMPFC rectifier

Detailed explanation of harmonic injection three-phase boost single-switch SPWMPFC rectifier

Posted on July 20, 2022July 20, 2022 by admin

For the constant switching frequency and constant on-time (Ton) SPWMPFC rectifier introduced earlier, the 5th harmonic content of the mains input current is still on the high side. In 1995, Q. Huang proposed a variable control method of Ton. The method is to inject the 6th harmonic to change the duty cycle d, so as…

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Comparison of multi-superrectifier characteristics and the influence of load dual-input PF

Comparison of multi-superrectifier characteristics and the influence of load dual-input PF

Posted on June 16, 2022June 16, 2022 by admin

In the power frequency UPS, the commonly used SCR polyphase phase-controlled rectifier is a 12-phase two-phase superimposed rectifier, and the 18-phase three-phase superimposed rectifier and the 24-phase four-phase superimposed rectifier may be used. Their characteristic values ​​are compared in Table 1. It can be seen from this table that when the UPS is working at…

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Figure 4 - Test waveforms considering the presence of harmonics in the mains voltage

Application of 12-phase rectifier and passive and active filter in UPS

Posted on June 11, 2022June 11, 2022 by admin

Most of the SCR polyphase phase-controlled rectifiers used in three-phase high-power power frequency UPS use 12-phase rectifiers or 12-phase rectification + 11th harmonic passive filters, which have become a typical power frequency UPS circuit mode, which can Meet the requirements of the national standard GB/T 7260.3 for the harmonic content of the mains input current….

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Influence of Input Transformer Connection on Harmonic Current

Influence of Input Transformer Connection on Harmonic Current

Posted on June 1, 2022June 1, 2022 by admin

The variable amplitude 12-phase two-superimposed rectifier is the most widely used in UPS. When the harmonic injection technology is adopted, its application will be wider. For this reason, we will briefly introduce the influence of the input transformer on the harmonic current. Provide time reference. There are two ways to connect the main circuit of…

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What is a 12-phase diode rectifier with transformer injected harmonics?

What is a 12-phase diode rectifier with transformer injected harmonics?

Posted on May 20, 2022May 20, 2022 by admin

This time, we introduce a 12-phase diode rectifier technology that uses transformers to inject harmonics, which can make 12-phase diode rectifiers become 24-phase diode rectifiers to improve the input power factor of mains power. The harmonic injection circuit is composed of an injection transformer and a single-phase rectifier bridge. The circuit utilizes the characteristic that…

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The working principle of the harmonic type SCR phase-controlled 12-phase rectifier

The working principle of the harmonic type SCR phase-controlled 12-phase rectifier

Posted on May 9, 2022May 9, 2022 by admin

In order to further improve the mains input power factor of the SCR polyphase phase-controlled power frequency rectifier, reduce the waveform distortion rate THDi of the mains input current to less than 10%, and make the mains input current and the mains input voltage in the same phase, there is a A simple and effective…

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What is the composition and principle of the mains input multi-phase rectifier transformer?

What is the composition and principle of the mains input multi-phase rectifier transformer?

Posted on April 24, 2022April 24, 2022 by admin

There are two ways to shift the phase of the mains input polyphase rectifier transformer to obtain the polyphase output: one is to use the star and delta connection (Y/△ or △/Y) between the primary and secondary to shift the phase by 30°; One is to use the series connection (zigzag connection) between the secondary…

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Definition, and characteristics of SCR polyphase phase controlled power frequency rectifier

Definition, and characteristics of SCR polyphase phase controlled power frequency rectifier

Posted on April 17, 2022April 17, 2022 by admin

Definition of SCR polyphase phase controlled power frequency rectifier The so-called SCR polyphase phase controlled power frequency rectifier refers to the use of polyphase rectifier transformer to convert the three-phase power supply of mains power input into an even multiple polyphase power supply of 6-phase, 12-phase, 18-phase and 24, and then connect the corresponding even…

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  • Analysis of Three Phase Single Switch Boost PFC Rectifier Controlled by Variable Frequency PWM
  • Detailed explanation of harmonic injection three-phase boost single-switch SPWMPFC rectifier
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  • Basic knowledge of IGBT three-phase SPWM inverter
  • Basic knowledge of uninterruptible power supply
  • SCR polyphase phase controlled power frequency rectifier and three-phase boost single switch SPWM PFC rectifier

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12-Phase Diode Rectifier Using Transformer-Injected Harmonics 12-phase rectification AC filter circuit Active filter Carrier triangle wave Cascade superposition of independent DC power supply Compensation for the influence of dead zone Composition of three-phase full-bridge SPWM inverter Development of inverter technology Double Fourier series analysis filtering principle of the DC side active filter High frequency UPS influence of dead zone on output voltage Influence of Input Transformer Connection on Harmonic Current Influence of unbalanced load on DC input current fluctuation Instantaneous space current phasor control method using hysteresis comparator Inverter technology Non-linear load Power frequency UPS PWM technology Rectifier SCR12 Phase Rectifier SCR polyphase phase controlled power frequency rectifier Simulation results of three-phase four-wire inverter Sinusoidal modulation wave space flux linkage phasor SPWM control method SPWM control technology SPWM soft-switching inverter technology The Composition and Principle of Mains Input Multiphase Rectifier Three-level SPWM control according to line voltage Three-level SPWM inverter Three-level SPWM wave Three-level SPWM waveform Three-phase half-bridge inverter Thyristor rectifier Two-level SPWM control according to the phase voltage waveform Two-level SPWM inverter Types of SPWM Types of spwm multilevel inverters Unbalanced load of inverter 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.