Abstract
A new control technique known as inverted error deviation (IED) control is incorporated into the main DC-link capacitor voltage regulation algorithm of a three-level neutral-point diode clamped (NPC) inverter-based shunt active power filter (SAPF) to enhance its performance in overall DC-link voltage regulation so as to improve its harmonics mitigation performances. In the SAPF controller, DC-link capacitor voltage regulation algorithms with either the proportional-integral (PI) or fuzzy logic control (FLC) technique have played a significant role in maintaining a constant DC-link voltage across the DC-link capacitors. However, both techniques are mostly operated based on a direct voltage error manipulation approach which is insufficient to address the severe DC-link voltage deviation that occurs during dynamic-state conditions. As a result, the conventional algorithms perform poorly with large overshoot, undershoot, and slow response time. Therefore, the IED control technique is proposed to precisely address the DC-link voltage deviation. To validate effectiveness and feasibility of the proposed algorithm, simulation work in MATLAB-Simulink and experimental implementation utilizing a TMS320F28335 Digital Signal Processor (DSP) are performed. Moreover, conventional algorithms with PI and FLC techniques are tested too for comparison purposes. Both simulation and experimental results are presented, confirming the improvement achieved by the proposed algorithm in terms of accuracy and dynamic response in comparison to the conventional algorithms.
Highlights
Harmonics mitigation and reactive power compensation have become increasingly essential in power distribution systems due primarily to significant increase of current harmonics resulted from widespread use of nonlinear loads such as power converters, adjustable speed drives and uninterruptible power supplies
The key specifications of the proposed shunt-typed active power filter (SAPF) and all the DC-link capacitor voltage regulation algorithms are summarized in Tables 3 and 4, respectively
The findings clearly show that SAPF utilizing each DC-link capacitor voltage regulation algorithm has successfully removed the current harmonics generated by all nonlinear loads, resulting in total harmonics distortion (THD) values of far below 5%, complying with the limit set by IEEE Standard 519-2014 [52]
Summary
Harmonics mitigation and reactive power compensation have become increasingly essential in power distribution systems due primarily to significant increase of current harmonics resulted from widespread use of nonlinear loads such as power converters, adjustable speed drives and uninterruptible power supplies. The DC-link capacitor voltage regulation algorithm with PI technique is more widely used due to its simple implementation features It performs with high overshoot [18,19,20,23,28] and large time delay [18,20,21,22,23,28] under dynamic-state conditions. Operation based on a direct control approach limits the capability of the designed DC-link capacitor voltage regulation algorithm. Voltage balancing of splitting DC-link capacitors is achieved via a neutral-point voltage deviation control algorithm [41,42,43] which ensures equal inflow and outflow of current at the neutral point Z, by adjusting the activation time of each switching. [15,16,41,44,45] switching algorithm
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