An optimal current control scheme in grid‐tied hybrid energy system with active power filter for harmonic mitigation

Abstract

Summary This paper presents hybrid photovoltaic (PV)‐wind‐battery energy storage network tied to three‐phase utility grid side inverter using fuzzy logic proportional integral derivative‐improved second‐order generalized integrator‐quadrature signal generator‐phase locked loop (FLPID‐ISOGI‐PLL) for power quality enhancement at the consumer side terminals. An advanced ISOGI‐PLL control strategy is implemented to separate the fundamental constituent of each phase load current without sensing other phase currents, which makes phase independent and reliable. It has several characteristics, such as improved hybrid system (HS) power penetration, load sharing, and power factor correction. Additionally, FLPID adaptive voltage controller is incorporated in the presented scheme to enhance dynamic operation of the system and also keeping the power balance between the dc and ac sides by maintaining the dc bus voltage. Moreover, the photovoltaic system's feed‐forward constituent is incorporated in the proposed technique, which improves the system dynamic performance and minimizes oscillations in grid currents. The outcomes of the advanced control strategy are found adequate for enhancing active power filter (APF) performance at the consumer side terminals under several operating conditions. The proposed control technique is computationally analyzed by simulating the system through MATLAB/SIMULINK under steady state, dynamic, load removed, and unbalanced grid voltage conditions. The competency of an advanced control approach is examined with hardware‐in‐loop (HIL) co‐simulation using FPGA Virtex‐7 VC‐707 via very high speed integrated circuit hardware description language (VHDL) code generation. Finally, the simulation outcomes are verified through a real‐time prototype laboratory platform using FPGA Virtex‐7 VC‐707 evaluation kit, and the total harmonic distortion (THD) analysis of injected grid currents is tabulated under different operating scenarios and found good within the IEEE‐519 standard limits.

Grid‐connected photovoltaic inverters with low‐voltage ride through for a residential‐scale system: A review

“…The current harmonics are directly related to the modulation scheme used for the switching action. 84 Some recent studies show that the THD is also related to the power level of PV systems. An excellent experimental analysis on the power quality issues of the PV systems is performed in Ref., 85 where the authors have focused on the unity power factor and the reactive power support modes.…”

“…For example, during a sag-event, the grid side impedance, voltage harmonics, and frequency may deviate from their nominal value. 84 An adaptive controller should be able to accommodate the significant grid parameter variations without degrading its performance. However, the digital implementation of the adaptive controller poses many challenges.…”

Improved power quality with an adaptive grid‐forming inverter control scheme in solar PV system

“…These types of control schemes have been introduced to increase the system behavior during dynamic conditions and also utilized to improve the power quality, grid synchronization, fundamental component extraction, dc-off set elimination, and low computation burden. Least mean square (LMS), 18 normalized LMS (NLMS), 19 least mean fourth (LMF), 20 echo state network [ESN], 21 second-order (SO) generalized integrator (GI), 22 dual SOGI (DSOGI), 23 improved SOGI (ISOGI), 24 multiple SOGI (MSOGI), 25 multilayer fifth order GI (MFOGI), 26 reduced order GI (ROGI), 27 and modified ROGI (MROGI). 28 The notch filter-based recently developed control schemes have been reported in the literature, which are an adaptive notch filter (ANF) 29 and an amplitude adaptive notch filter (AANF).…”

“…Comparative study with recently published adaptive control schemes[18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] …”