Common AC/DC bus interleaved multi-level APF harmonic combination module and algorithm

Abstract

The invention discloses a common AC / DC bus interleaved multi-level APF harmonic combination module. The harmonic combination module mainly comprises a harmonic combination algorithm module, a PWM module, a direct current side capacitor and a common AC / DC bus interleaved output unit. The common AC / DC bus interleaved output unit is formed by interleaving two three-level diode neutral point clamped inverter circuit units in parallel; the direct current side capacitor is connected with the three-level diode neutral point clamping type inverter circuit unit and provides direct current voltage for the three-level diode neutral point clamping type inverter circuit unit; and the output of the harmonic wave combination algorithm module is used as a modulation wave of the PWM module, and the output of the PWM module controls the output of the alternating current and direct current bus interleaved output unit. The invention also discloses the common AC / DC bus interleaved multi-level APF harmonic combination module. The DC voltage utilization rate can be effectively improved, the equipment manufacturing cost is reduced, and the equipment working reliability is improved.

Description

Technical field [0001] The present invention relates to the field of electrical energy, and more particularly to a co-alternating multi-level APF harmonic combination module and algorithm. Background technique [0002] In the power industry in the world, there is almost the sinusoidal power supply of a single constant frequency, but the investment of a large number of power electronic devices produces a large number of harmonics. The currently commonly used solutions have passive filtering and active filters, where some source filter is usually used. Power electronic equipment compensates for harmonics. Since the harmonic is superimposed, the traditional APF may result in a larger voltage drop in the inductance, and the number value is higher than the grid side voltage, which requires higher DC side. Voltage, therefore may result in more than capacitance, reduce capacitive life, and even a capacitor explosion. [0003] Therefore, there is an urgent need to provide a new type of c...

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Problems solved by technology

[0002] In the power industry of all countries in the world, almost all sinusoidal power supplies with a single constant frequency are used, but the investment of a large number of power electronic equipment has caused a large number of harmonics in the power grid. At present, the commonly used solutions are passive filtering and active filtering. Active filtering usually uses Power electronic equipment compensates for harmonics. Due to the superposition of various harmonics, the use of traditional APF may cause a large voltage drop on the inductance, which is higher after being superimposed with the voltage on the grid side, which requires a higher voltage on the DC side. Voltage, so it may lead to exceeding the withstand voltage value of the capacitor, reducing the life of the capacitor, and even causing accidents such as capacitor explosion

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