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Modulation method for active neutral-point clamp type tri-level inverter

A modulation method and three-level technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the problems of poor loss distribution balance of switching devices

Active Publication Date: 2013-11-20
SHANXI LUAN ENVIRONMENTAL ENERGY DEV +1
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Problems solved by technology

[0009] The purpose of the present invention is to overcome the problem that the existing sinusoidal pulse width modulation method controls the active neutral point clamp inverter, and the problem that the loss distribution of each switching device of the inverter is poorly balanced, and proposes an active neutral point clamp three-level inverter Transformer Modulation Method

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  • Modulation method for active neutral-point clamp type tri-level inverter
  • Modulation method for active neutral-point clamp type tri-level inverter
  • Modulation method for active neutral-point clamp type tri-level inverter

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Embodiment Construction

[0067] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0068] Figure 4 It is the pulse width signal diagram of the modulation method of the present invention, which mainly includes three parts: (1) comparison waveform diagram of carrier wave and modulating wave; Pinghe-Udc / 2 three-level square wave diagram; (3) According to the modulation method of the present invention, six PWM pulses of Ta1, Ta2, Ta3, Ta4, Ta5, and Ta6 are generated.

[0069] The pulse width modulation method of the present invention comprises the following steps:

[0070] (1) Define the output level state and level switching mode of the three-level active neutral point clamp inverter;

[0071] Three-phase three-level active neutral point clamp inverter is a device that converts direct current into sinusoidal alternating current. Such as figure 1 As shown, the three-phase three-level active neutral point clamped inverter inc...

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Abstract

The invention relates to a modulation method for an active neutral-point clamp type tri-level inverter. Based on a tri-level sine pulse-width modulation method, the modulation method of the invention obtains required pulse-width modulation signals by defining level switching manners of the active neutral-point clamp type tri-level voltage-source inverter, and designing conduction sequence of different switching elements according to different influences of the two switching manners on power consumption of the switching elements. The pulse-width modulation signals are used to control switching on / off of each switching element of the active neutral-point clamp type tri-level inverter, so that dc is converted into ac, and ac is provided for a load. The modulation method is suitable for large-power tri-level voltage-source inverters.

Description

technical field [0001] The invention relates to a three-level inverter modulation method. Background technique [0002] The multi-level voltage source inverter can make it reach a higher voltage level without a transformer or synchronous switching devices in series. It can generate approximately sinusoidal output voltage, suitable for high voltage and high power applications. [0003] The earliest multi-level topology was proposed by Baker et al. in 1975. This multi-level topology constitutes a cascaded inverter by connecting single-phase full-bridge inverter units powered independently by their respective DC power sources in series. In 1980, Nabae and others proposed a neutral point clamped three-level inverter circuit structure. The basic idea is to obtain a multi-level ladder waveform output to be equivalent to a sine wave through a certain main circuit topology. [0004] This three-level midpoint clamped inverter topology solves the problems of low output power and lo...

Claims

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Application Information

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IPC IPC(8): H02M7/487H02M7/5387
Inventor 葛琼璇张波常乾坤李雷军张文平
Owner SHANXI LUAN ENVIRONMENTAL ENERGY DEV
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