Single-Phase Inverter Deadbeat Control with One-Carrier-Period Lag

Abstract

This paper presents a novel digital control scheme for the regulation of single-phase voltage source pulse width modulation (PWM) inverters used in AC power sources. The proposed scheme adopts two deadbeat controllers to regulate the inner current loop and the outer voltage loop of the PWM inverter. For the overhead of digital processing, the change of duty of PWM lags one carrier period behind the sampling signal, which is modeled as a first-order lag unit in a discrete domain. Based on this precise modeling, the deadbeat controllers make the inverter get a fast dynamic response, so that the inverter’s output voltage is obtained with a very low total harmonic distortion (THD), even when the load is fluctuating. The parameter sensitivity of the deadbeat control was analyzed, which shows that the proposed deadbeat control system can operate stably when the LC filter’s parameters vary within the range allowed. The experimental results of a 2kW inverter prototype show that the THD of the output voltage is less than 3% under resistive and rectifier loads, which verifies the feasibility of the proposed scheme. An additional advantage of the proposed scheme is that the parameter design of the controller can be fully programmed without the experience of a designer.

Deadbeat Current Control in Grid-Connected Inverters: A Comprehensive Discussion

“…Turning polynomials 𝐶 1(𝑧) and 𝑀 (𝑧) are used to make the controller less aggressive and 𝑄 (𝑧) is used to give the controller some degrees of freedom. This approach was adopted recently in [16], where the authors designed both the inner current loop and the outer voltage loop using this approach and applied the controllers to a single-phase inverter with one-carrier-period lag. The study achieved a good result and was unique because the authors used DBC in both loops.…”

“…This method was adopted in [16] to control a single-phase inverter with one-carrier-period lag, and the researchers employed two DB controllers: a current controller in the inner loop and a voltage controller in the outer loop. This study achieved a good result based on the lower total harmonic distortion (THD) obtained.…”

Adaptive neuro‐fuzzy inference systems (ANFIS) controller design on single‐phase full‐bridge inverter with a cascade fractional‐order PID voltage controller

“…FCM is a clustering method that permits each point of data to belongs to various clusters with different membership degree, which the sum of members' value in all the clusters is 1. FCM operation is based on minimising cost function of Equation (12).…”

“…Furthermore, in an active damping technique, closed-loop control strategies can be proposed [7]. Hence, because of the switching properties of inverter, control strategies such as sliding-mode control [8,9], dead beat technique [10,11], and internal model control [12] have been proposed. In fact, the greatest benefit of dead beat, internal model, and sliding-mode controllers is that they provide an output load waveform without ringing and overshoot.…”

Processor-in-the-Loop Validation of an Observer Current-based Dead-Beat Control for a Single-Phase UPS Inverter

“…In [15], the dead-beat control for power converters using fractional-order time delay compensation is defined as an effective and powerful delay compensation approach that has been applied in various control systems. In [16][17][18][19][20][21], single-phase inverter's deadbeat-based Proportional-Integral (PI) controller was proposed and comparisons with conventional control techniques were made. However, the implementation of the deadbeat controller is very complicated, and due to the difficulty of its design, it is not suited for low cost implementations.…”