Improvement of power quality parameters using modulated-unified power quality conditioner and switched-inductor boost converter by the optimization techniques for a hybrid AC/DC microgrid

Khosravi, Nima; Abdolvand, Abdollah; Oubelaid, Adel; Khan, Yawer Abbas; Bajaj, Mohit; Govender, Scott

doi:10.1038/s41598-022-26001-8

Cited by 30 publications

(18 citation statements)

References 35 publications

(37 reference statements)

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“…The second section (b) shows the network voltage along with the M-UPQC module. It can be see that the voltage waveform has improved considerably [104]. The network voltage unbalance is other aspect provided in Fig.…”

Section: Resultsmentioning

confidence: 75%

“…In the second section (b), by M-UPQC, the system unbalanced be improved to an acceptable level in 1 pu value. The another factor in the 'PQ' issue is harmonics which is defined as a total harmonic distortion (THD) component in electrical standards [104]. Conventional power angle control (PAC) methods lead to reactive power circulation and increased UPQC loading.…”

Section: Resultsmentioning

confidence: 99%

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An Overview on Power Quality Issues and Control Strategies for Distribution Networks With the Presence of Distributed Generation Resources

Razmi

Papari

et al. 2023

IEEE Access

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Power systems based on centralized production are facing two limitations: the lack of fossil fuels and the need to reduce pollution; Therefore, the importance of distributed generation resources (DGs) has increased by connecting renewable energy systems to the network. With the increasing penetration of renewable energies in the network, power quality challenges in low voltage and medium voltage distribution systems have become one of the main fields of studies. Since most of the renewable energy systems are connected to the network with the help of electronic power converters devices and the main purpose of these converters is to connect DGs to the network in compliance with power quality standards; Therefore, if the switching frequency of inverters is not implemented properly, major power quality problems will be created. On the other hand, the reduction in power quality causes acute problems in power networks, which include lack of proper performance, reduction in useful life and efficiency of electrical and electronic devices in the network, creation of series and parallel resonance in some harmonics due to the presence of inductors and the capacitor, and as a result, more distortion in the voltage of the distribution network. This paper actually provides a road-map for researchers to investigate power quality issues. In other words, the mentioned cases show the importance of research and providing the solutions to improving power quality in distribution networks.

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Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

An Overview on Power Quality Issues and Control Strategies for Distribution Networks With the Presence of Distributed Generation Resources

Razmi

Papari

et al. 2023

IEEE Access

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“…To confirm the passive voltage imbalance, after one second, the frequency set point is changed from 60 to 50 Hz and islanding is confirmed. The NDZ is very small, error ratio is low, and detection time is more with small power quality degradation [28].…”

Section: (Iv) Power Qualitymentioning

confidence: 99%

Integrated Microgrid Islanding Detection with Phase Angle Difference for Reduced Nondetection Zone

Lingampalli

Kotamraju

Kumar

et al. 2023

International Journal of Energy Research

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Microgrids with distributed generation (DG) are rapidly coming into distribution networks to supply load demand in order to preserve ecological balance and reduce greenhouse gas emissions. Power electronic advancements are making renewables dispatchable to loads while turning passive networks to active with bidirectional power flow. The IEEE-1547-2018 regulations enforced certain standards on microgrids, including the ability to detect unintended failures, island the microgrid in less than 2 seconds, and feed connected loads while maintaining voltage, frequency, and power quality. There are numerous islanding techniques accessible, including passive, active, hybrid, and communication techniques. The active techniques degrade power quality due to injection of deviations, passive type leaves larger nondetection zone (NDZ), and communication type are costly. The hybrid type combines both passive and active methods. To get away from all these issues, a passive technique is formulated in this paper, which measures the differential phase angle of voltage and current at DG output, to detect islanding. This approach reliably identifies islanding in 20 ms at nearly zero NDZ. This approach is also stable during transient conditions such as load switching and throwing off. There is also no power quality issue because there are no injections during testing. This method is tested in MATLAB/Simulink and evaluated using the differential frequency technique to get performance indices in accordance with UL-1741 testing standards.

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“…In microgrids, active and passive power flters are generally used to reduce the amplitude of harmonics in the system. In the literature [8][9][10], corresponding active flter optimization design methods are proposed for diferent types of microgrids, which efectively improve the power quality of the AC busbar. Compared to the active flter, the passive flter is more suitable for scenarios with a higher power.…”

Section: Introductionmentioning

confidence: 99%

Parameter Design of Half-Bridge Converter Series Y-Connection Microgrid Grid-Connected Filter Based on Improved PSO-LSSVM

Wang

Guo

et al. 2023

International Transactions on Electrical Energy Systems

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The half-bridge converter series Y-connection microgrid (HCSY-MG) is a new type of series microgrid. In order to reduce the harmonic content in HCSY-MG grid-connected current and at the same time simplify the parameter design process of the LCL filter, this study proposed an LCL filter parameter design method based on an improved particle swarm optimization-least squares support vector machine (PSO-LSSVM) by analyzing the harmonic characteristics of the HCSY-MG grid-connected current. In addition, to enhance the convergence speed of PSO-LSSVM, the inertia factor during its parameters’ update is made to adjust adaptively according to the direction of two consecutive parameter changes to constitute an improved PSO-LSSVM. Through simulation and comparative analysis, it is demonstrated that the improved PSO-LSSVM can enhance the convergence speed; the proposed filter parameter design method can effectively reduce the harmonic content in the HCSY-MG grid-connected current and is simpler and more comprehensive than the existing design method.

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Improvement of power quality parameters using modulated-unified power quality conditioner and switched-inductor boost converter by the optimization techniques for a hybrid AC/DC microgrid

Cited by 30 publications

References 35 publications

An Overview on Power Quality Issues and Control Strategies for Distribution Networks With the Presence of Distributed Generation Resources

An Overview on Power Quality Issues and Control Strategies for Distribution Networks With the Presence of Distributed Generation Resources

Integrated Microgrid Islanding Detection with Phase Angle Difference for Reduced Nondetection Zone

Parameter Design of Half-Bridge Converter Series Y-Connection Microgrid Grid-Connected Filter Based on Improved PSO-LSSVM

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