Centralised model‐predictive decoupled active–reactive power control for three‐level neutral point clamped photovoltaic inverter with preference selective index‐based objective prioritisation

Abstract

This study presents a single-stage grid-tied three-level neutral point clamped photovoltaic inverter with a centralised model-predictive decoupled active-reactive power control. The proposed centralised model predictive control (CMPC) incorporates the constraints of maximum power extraction, dc-link capacitor voltage balancing and active-reactive power tracking in a single objective function. The dc-link voltage of the inverter is regulated to its reference for extracting the maximum power. In order to eliminate the impact of reactive power exchange on floating dc-link voltage regulation, a decoupled activereactive power control is used in the CMPC. Furthermore, a preference selective index-based dynamic weighting factor selection approach is introduced to maintain the relative importance between the power tracking and dc-link capacitor voltage balancing. The proposed control approach eliminates the outer dc-link voltage control loop and also, the empirical approach required for the selection of weighting factors. As a result, it ensures an optimal control action in each sampling period to improve the steady-state and dynamic tracking performance of the control objectives. The proposed control approach is experimentally verified by using a 1.2 kW laboratory-scale prototype and the results are presented to demonstrate its effectiveness compared to the classical proportional-integral-based model predictive control.

Analysis of the factors affecting the fault of photovoltaic power generation equipment

“…As the hub device of the photovoltaic grid connected system, the main role of the photovoltaic inverter is to ensure that the maximum power point tracking control can be tracked under different light intensity and temperature, and the stability of the phase, frequency and amplitude of the electrical energy generated by the photovoltaic system can meet the grid connection requirements [6][7] . Table 1 shows the photovoltaic inverter faults and it analyzes the influencing factor of the faults.…”

FFS modulated VSC with different phase‐shifted 12‐pulse configured transformers for grid integrated large‐scale solar PV plant

“…The decoupled current (DQ) control [19][20][21][22][23][24] is used by the PCU controller to independently control the active and reactive power. The details of the control logic are presented in Fig.…”

“…References (20) and (21), respectively. The cross-coupling terms I q wL and I d wL are used to improving the performance of current controller…”

“…The INC based MPPT has high steady-state accuracy and better dynamic response over P&O-based MPPT [14]. Grid-side control algorithm has utilised the decoupled DQ-current control [19][20][21][22][23][24] for independent control the PCU active and reactive powers into the AC grid.…”

Model predictive power control for grid‐connected ac–dc converters with trajectory optimisation of the modulated voltage vector

“…In order to avoid the use of inner-loop PI-based power decoupling controllers, various advanced DPC schemes, such as deadbeat predictive DPC [14,15], DPC based on fuzzy sliding control [16] and model predictive power control (MPPC) [17][18][19][20], are proposed to further improve the control performance. Due to the fast dynamic response and precise steady characteristic, these advanced MPPC schemes are widely applied.…”