Algorithm‐based direct power control of active front‐end rectifiers

Abstract

Switching Table-based Direct Power Control (ST-DPC) is one of the most widely used techniques in Active Front-End (AFE) rectifiers. Proper control of switching states of the power converter is essential to obtain better power quality performance and quicker response to the load demand. In the classical ST-DPC techniques such as Virtual Flux with Noguchi's Table-based DPC (VF-NT-DPC) and Virtual Flux with Improved Table-based DPC (VF-IT-DPC) etc., these switching states are decided based on a predefined static switching table. Hence, they have poor power quality and dynamic performance with load variations. In this research work, in-depth mathematical analysis is carried out based on the quantised values of 'the rate of change of active and reactive powers' and an algorithm is introduced for AFEs. Since, the proposed algorithm is considering the quantised values of 'the rate of change of active and reactive powers', which is dynamic in nature; therefore, it has reduced THD, lesser power ripple, and quicker response than classical ST-DPC techniques. To show the superiority of the Algorithm based DPC (A-DPC) technique experimental work is carried out and the power quality performance of the proposed A-DPC is compared with conventional ST-DPC techniques VF-NT-DPC and VF-IT-DPC.

An advanced virtual flux integrated multifold table‐based direct power control with delay compensation for active front‐end rectifiers

“…The converter and other circuit elements that act as the plant in this setup are common for all the aforementioned controllers like the ST‐DPC, FCS‐DPC, or DCMST‐DPC only difference being the microcontroller unit, which brings about a reduction in the cost. The total cost of the system is estimated as the process described in the literature 21 …”

“…Even with all of these advanced DPC approaches, the traditional switching table‐based DPC is still favored where a simple control structure with less computational burden is the design requirement. Hence, an algorithm‐based vector selection method that functions through a dynamic switching table can address the issue of using static lookup table in the classical ST‐DPC 21,22 . The algorithm DPC improves steady‐state behavior as well as improves the dynamic performance.…”

“…Hence, an algorithm-based vector selection method that functions through a dynamic switching table can address the issue of using static lookup table in the classical ST-DPC. 21,22 The algorithm DPC improves steady-state behavior as well as improves the dynamic performance.…”

Enhanced Performance of Charging Stations via Converter Control Under Unbalanced and Harmonic Distorted Grids

“…That is, the authors in [14] concluded that a controlled EV charging system can significantly reduce unbalances in networks, especially for long distribution feeders. A number of works on gridconnected converter control [20]- [28] have been published focusing on improving the grid-injected currents of active front-end rectifiers. Meanwhile, the GCCs are used to improve the power-quality at the point of common coupling (PCC) of a 3-phase 4-wire system in [15] with functions of an active power filter in addition to the real power generation from renewable energy sources (RES) to the grid.…”