Low DC voltage PV generation system with power factor correction and harmonic suppression capability in a distribution network

Tao, Ye; Dai, Ningyi; Lao, Keng Weng; Lam, Chi-Seng; Wong, Man-Chung

doi:10.1049/iet-gtd.2018.5144

Cited by 16 publications

(7 citation statements)

References 25 publications

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“…The current controller is a very important component of the APF system. There are linear controllers, such as simple proportional current controllers [29,30], complex proportional multi-resonant controllers for selective harmonic compensation [27,29], or quasi-proportional-resonant controllers [29,31]. It must be mentioned that it is difficult to achieve simultaneously small steady-state error and fast dynamic responses by using linear controllers [29].…”

Section: Introductionmentioning

confidence: 99%

Improving Power Quality by a Four-Wire Shunt Active Power Filter: A Case Study

et al. 2021

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This paper presents the use of a three-phase four-wire shunt active power filter to improve the power quality in the Department of Industrial Electronics of a large enterprise from Romania. The specificity is given by the predominant existence of single-phase consumers (such as personal computers, printers, lighting and AC equipment). In order to identify the power quality indicators and ways to improve them, an A-class analyzer was used to record the electrical quantities and energy parameters in the point of common coupling (PCC) with the nonlinear loads for 27 h. The analysis shows that, in order to improve the power quality in PCC, three goals must be achieved: the compensation of the distortion power, the compensation of the reactive power and the compensation of the load unbalance. By using the conceived three-leg shunt active power filter, controlled through the indirect current control method in an original variant, the power quality at the supply side is very much improved. In the proposed control algorithm, the prescribed active current is obtained as a sum of the loss current provided by the DC voltage and the equivalent active current of the unbalanced load. The performance associated with each objective of the compensation is presented and analyzed. The results show that all the power quality indicators meet the specific standards and regulations and prove the validity of the proposed solution.

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Section: Introductionmentioning

confidence: 99%

Improving Power Quality by a Four-Wire Shunt Active Power Filter: A Case Study

et al. 2021

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“…Its second-order series LC circuit increases the difficulty of developing its control method from existing solutions. For example, second-order non-linear current controller is studied in [34][37] [38] and PR controller is studied in [35] [39]. Droop-control method is also applied to control CCIs [28][36] [40].…”

Section: Introductionmentioning

confidence: 99%

A Virtual-Impedance Droop Control for Accurate Active Power Control and Reactive Power Sharing Using Capacitive-Coupling Inverters

Deng

Dai

Lao

et al. 2020

IEEE Trans. on Ind. Applicat.

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Capacitive-coupling inverters (CCIs) have low operation voltage and enhanced reactive power control capability. It is a promising alternative to provide reactive power and voltage regulation in microgrids (MGs). Droop control is one of the most widely used primary controllers under a hierarchical framework in a MG. However, conventional droop control performance needs improvement since the droop curve assumption is not valid in part of CCI's operational area. At the same time, reactive power sharing error due to the uncertainty factor of feeder impedance needs to be minimized. In this paper, virtual-impedance droop control is proposed for CCIs to solve the two issues. A virtual impedance selection method is developed with consideration of CCI's second-order LC coupling branch. First, the virtual impedance is selected for reducing the coupling between the active and reactive power of CCIs. The stability and sensitivity of the system are also evaluated based on a small-signal model to provide guidelines for virtual impedance selection. The proposed control varies the equivalent impedance via a feed-back loop in CCI's control for accurate power control and sharing in MGs under mismatched feeder impedance. The validity of the proposed virtual-impedance droop control is verified through simulation and experimental results.

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“…Several current associated PQ issues are being addressed by distribution static compensator (D-STATCOM), which is a type of shunt connected CPD. It has gained widespread attention as it can be controlled to serve numerous functions such as compensation of load reactive power and regulating the voltage along with harmonics mitigation at the point of common interconnection [3,4]. Several other solutions in the form of hybrid compensator viz.…”

Section: Introductionmentioning

confidence: 99%