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Compared with traditional analog control, digital control has many prominent advantages, but it also introduces new problems, the most important one is time delay in the process of digitization. This paper studies the mathematical model in the process of digital sampling, holding and one-step-delay control, then establishes an accurate mathematical model of the inverter considering of the time delay,...
In this paper, the development of three-phase renewable energy inverter by using the dSPACE DS1104 digital signal processing controller board is presented. The board enables the MATLAB/Simulink model linking to the hardware. The standalone voltage source inverter's control system which is implemented in the DS1104 board utilizes a digital proportional integral controller to stabilize its 50Hz sinusoidal...
This paper presents a discrete-time predictive control strategy for a voltage-source inverter based on computation of a deadbeat control law and its approximating suboptimal voltage vector at every sampling interval. The controller, in addition to compensating for the inherent delay in the system, employs a simple prediction filter to suppress the disturbance caused by the back-EMF voltages and improve...
The purpose of this paper is to show a high performance digital control technique of single phase inverters with internal state feedback. The study proves that the high speed processor allows an excellent output signal waveform, even in critical conditions. The reduced computational effort is an attractive feature. That is obtained by using fixed-point arithmetic and proportional integral compensators.
The traditional PID control strategy which is realized in digital method canpsilat achieve better performance than that in analog control. The reason was analyzed why the digital process influences the digital controlled PWM inverterpsilas performance in this paper. One is the process of the zero-order hold. Another one is one-step-delay control which is usually adopted in digital control. Three aspects...
In the distributed AC supply system without control interconnection, the parameters unbalance because of nonuniformity between the unit inverters is inevitable. The supplier unit is difficult to share power properly. Based on the digital control inverter with instantaneous capacitor-current feedback, the affection to power sharing of the filter inductance and equivalent line impedance are analyzed...
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