Single-phase inverter input voltage ripple modulation compensation method

A single-phase inverter, input voltage technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problem of poor compensation effect, suppress the influence of input voltage ripple, improve output quality, and reduce control. effect of time

Active Publication Date: 2014-03-26
惠州汇能精电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this compensation method, as the effective value of the input voltage deviates from the rated input voltage, the compensation effect will become worse, and there is always a time delay of one carrier cycle

Method used

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  • Single-phase inverter input voltage ripple modulation compensation method
  • Single-phase inverter input voltage ripple modulation compensation method
  • Single-phase inverter input voltage ripple modulation compensation method

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0025] like figure 2 As shown, the inverter system includes a DC voltage source composed of a lead-acid battery, an input filter capacitor, a single-phase full-bridge MOSFET inverter circuit, a power frequency step-up transformer, and a digital control system composed of an LM4F230 microprocessor and peripheral chips. device and other parts. The rated input voltage range is 20V~32V, the rated output voltage is 220V±5%, and the rated output frequency is 50Hz±0.5Hz. The clock frequency of the digital controller timer module is 80MHz, and the array length N is 256. At this time, the switching frequency of the inverter circuit is 25.6kHz, and the amplitude of the positive half-cycle sine law changes the array, that is, the maximum value of the timer count is 3125.

[0026] Aiming at the compensation link of the input voltage ripple of the full-brid...

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Abstract

Provided is a single-phase inverter input voltage ripple modulation compensation method which comprises the following steps: when a modulation pulse is outputted, an inverter output voltage and a full-bridge inverter circuit input voltage are acquired; the inverter output voltage is processed so that an SPWM modulation pulse signal is acquired; a ripple parameter is extracted from the full-bridge inverter circuit input voltage; and output voltage harmonic waves brought by ripples can be eliminated from the modulation effect after compensation according to each pulse width of the SPWM modulation pulse signal compensated by the ripple parameter. A modulation strategy is compensated only in software so that hardware cost is saved. Besides, the input voltage ripple parameter is compensated directly so that influence of the ripples can be effectively inhibited and output quality of an inverter system is enhanced.

Description

technical field [0001] The invention belongs to the field of inverter control, and relates to a modulation and compensation method for input voltage ripple of a full-bridge inverter circuit of a single-phase inverter. Background technique [0002] When the single-phase inverter is used in practice, due to its own structure, the voltage at the input terminal of the full-bridge inverter circuit will have a low-frequency ripple that is twice the output frequency, and the ripple amplitude will increase with the increase of the inverter load. However, the position of the ripple peak relative to the starting point of the modulation signal moves when the load impedance changes. [0003] Sinusoidal pulse width modulation (SPWM) modulation strategy is based on the premise of constant voltage at the input end of the full-bridge inverter circuit, so the ripple in the input voltage will affect the quality of the inverter output voltage, so that the fundamental wave is superimposed on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14
Inventor 孙本新
Owner 惠州汇能精电科技有限公司
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