Abstract
This paper proposes the Finite control set Model Predictive Control (FCS-MPC) with delay compensation for three-phase threelevel T-Type NPC inverter (T-Type NPC) of grid-connected photovoltaic systems (PV). The proposed FCS-MPC controls the objectives: current tracking control, DC-link capacitor voltage balance, the reduction of switching frequency to ensure issues of the power quality and improve the efficiency of grid-connected of PV system. The cost function of the proposed FCS-MPC uses the 27 possible switching states generated by TType NPC, the optimal switching state is selected in each sampling time that minimizes the cost function. The proposed FCS-MPC has also proposed the delay compensation with two-step prediction horizon at time k+2 to reduce the total harmonic distortion (THD) of the grid current. The proposed FCS-MPC is verified by using Matlab/Simulink.
Highlights
In the recent decades, photovoltaic system (PV system) quickly has been developed about the installed power, as well as the penetration into the electrical grid
To demonstrate the flexibility for controlling gridconnected of photovoltaic systems (PV) systems, the reference grid current of d-axis of the rotating dq frame will have the different values at different times, and the reference grid current of q-axis with iqref = 0A; sample time Ts = 25μs with sampling frequency fs = 1/Ts = 40kHz applies the proposed Finite control set Model Predictive Control (FCS-Model predictive control (MPC)):
The proposed FCS-MPC provides the excellent of grid-connected of PV system with the changes of injected power into grid, the low total harmonic distortion (THD) of grid current and the good DC-link capacitor voltage balance
Summary
Photovoltaic system (PV system) quickly has been developed about the installed power, as well as the penetration into the electrical grid. This paper focuses on the control for the objectives of grid-connected of PV system: current tracking control, balancing dc-link capacitor voltage, the reduction of switching frequency by using the proposed FCS-MPC with delay compensation. In order to reduce the computation amount, this paper proposes that the values of current and dc-link capacitor voltages at time k+1, will be estimated based on the optimal switching state at time k-1, use these estimated values to predict the values at time k+2. The change of weighting factor in the interrelationship between the objectives of cost function, will prove the flexibility of the proposed FCS-MPC for solving the problems of power quality and enhancing efficiency of grid-connected for PV system via the reduction of switching frequency
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