Superior decoupled control of active and reactive power for three-phase voltage source converters

Ahmed‐Foitih

2021

IJPEDS

This paper aims to present a fuzzy logic control (FLC) of active and reactive power for a grid-connected photovoltaic system. The PV system is connected to the grid utility using a three-level neutral point clamped inverter (3L-NPC) and LCL filter. Two control strategies, fuzzy logic control, and conventional PI control are applied. The design of the two control strategies is based on calculating the instantaneous active and reactive power from the measured grid voltages and currents to allow the system to have a dynamic robustness performance against a sudden change in reactive power and satisfactory active power tracking under rapid solar radiation changes. The control strategies can transfer the total active power generated by the PV array to the grid utility with high power quality and a unity power factor. The simulation results using the Matlab-Simulink environment show that the FLC strategy has a better dynamic performance with less settling time, and overshoot compared to the conventional PI control.

Section: Research Methods 21 Main Structure Of Grid-connected Pv Systemmentioning

confidence: 99%

Fuzzy logic control of active and reactive power for a grid-connected photovoltaic system using a three-level neutral-point-clamped inverter

Ahmed‐Foitih

2021

IJPEDS

“…2) PQ control strategy based on multivariable PI-controller Contrary to the PQ controller conventional PI-controller that composed by feed forward signals to minimize the coupling between two axes, moreover the inverter terminal voltage are calculated based on specific method [21]. Therefore the Table 6 is comparison of benefits and disadvantages of each type of PQ controller.…”

Section: Type Of Pq Controllermentioning

confidence: 99%

Review on the Coordination and Energy Management of Microgrids Broad Based on PQ Controller and Droop Control. Some Useful Information Is Given in This Paper

Nduwamungu¹

2017

OALib

The integration of distributed Energy Resources (DER) is challenging electrical network quality which is the main vital and ubiquitous all over the world. Coordination and energy management of microgrids in grid connected and in islanded mode is one of solutions of distribution power quality with best reliability, and stability to ensure power system resilience. In this review, the coordination and energy management of microgrids broad based on PQ controller and droop control some useful information is given in details and analyzed. Additionally, possible structures, options and control methods of DER units are presented which is followed by the descriptions of system controls and energy management strategies. Eventually, future trends of microgrids are discuss, point out how this concept can be a key to select a best method of coordination and managing microgrids for future researchers in order to tackle some challenges based on power quality.

Turk J Elec Eng & Comp Sci

“…The DSTATCOM is a shunt-connected compensator that injects currents into the distribution system through a current-controlled voltage-source inverter (VSI) [9][10][11]. The DSTATCOM is used for harmonic filtering, power factor correction, and load balancing.…”

Section: Introductionmentioning

confidence: 99%

A multifunctional DSTATCOM for power quality improvement

Mahdianpoor¹,

Kiyoumarsi²,

Ataei³

et al. 2017

Abstract:The distribution static compensator (DSTATCOM) is used for various purposes such as load balancing, harmonic rejection, and power factor correction (PFC) in power distribution networks. In unbalanced and polluted power systems, the classic definition of power factor cannot be used for PFC due to the existence of harmonics and negative sequence components in voltage and current waveforms. In this paper, PFC is performed using the IEEE power factor definition for harmonic and unbalanced environments. Moreover, the application of a proportional-resonant (PR) controller is proposed as an effective controller in the stationary frame for DSTATCOM performance improvement. The PR controller is used in the abc-frame for load balancing and is then compared theoretically and by simulation with the conventional PI controller, which has the main drawback of steady-state error when used in the stationary frame. To improve the DSTATCOM structure, an LCL harmonic filter is used as it is advantageous over the L/LC filter in terms of the size of the filter. The proposed DSTATCOM compensates for the disturbances in the source current imposed by nonlinear, unbalanced, and low power factor loads. Simulation results show the capability of the DSTATCOM including the proposed PR controller in improving the power quality of distribution systems.