Deadbeat current control method for adding zero vector for grid-connected inverter

Abstract

The invention discloses a deadbeat current control method for adding a zero vector for a grid-connected inverter. A single-phase photovoltaic grid-connecting inversion system is composed of a photovoltaic array, a voltage-type invertible PWM (pulse-width modulation) rectifier, a maximum power point tracking unit (MPPT) and an invertible variable flow control system based on a DSP (digital signal processor. The deadbeat current tracking control method for adding zero vector modulation is used for inhibiting the current change rate in the PWM control and reducing a power tube switch stress so that a network-side current can track an order current within a switch period so as to achieve an electric energy high-quality control function; the method comprises the following steps: tracking the current within a PWM control period; controlling the on-off of the V1-V4 power tube switches shown in a figure; and limiting the change rate of the current, therefore, the actual current can catch up with the order current within the PWM period so as to achieve the deadbeat current tracking control.

Description

1. Technical field [0001] The invention relates to an inverter control method, in particular to a dead-beat current control method for a grid-connected inverter with zero vector added. 2. Background technology [0002] Grid-connected inverters applied to new energy generation such as photovoltaics or wind power need to be able to quickly and stably track the maximum power point of solar panels or wind turbines, flexibly control output active power and harmonics, and have excellent dynamic response and regulation speed to adapt to changes in natural conditions such as light or wind. The single-cycle control method adjusts the duty cycle of the inverter switching tube through pulse width modulation PWM, so that the average value of the controlled quantity in the switching cycle is equal to the reference setting. This method has the advantages of fast dynamic response, good robustness, fixed switching frequency, etc., and is a good performance control method for grid-connected...

AI Technical Summary

Problems solved by technology

The digital method obtains the average value of the controlled quantity in one switching period, and needs to sample the instantaneous value of the controlled quantity multiple times in one switching period for filtering and average calculation, which takes up a lot of DSP chip resources, and puts forward a challenge to the computing power of the DSP chip. High requirements increase the cost of the system

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