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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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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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Recent Posts

  • Comparison of multi-superrectifier characteristics and the influence of load dual-input PF
  • Application of 12-phase rectifier and passive and active filter in UPS
  • Influence of Input Transformer Connection on Harmonic Current
  • What is a 12-phase diode rectifier with transformer injected harmonics?
  • The working principle of the harmonic type SCR phase-controlled 12-phase rectifier

Categories

  • 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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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.