Combined active power sharing and grid current distortion enhancement‐based approach for grid‐connected multifunctional photovoltaic inverter

Abstract

Summary Distributed generation (DG) is an important technology for increasing penetration of renewable energy sources (RES) and thereby reducing oil use and coal‐related emission. In addition, there has been recent renewed interest in multifunctional photovoltaic inverter due to its uniqueness to provide ancillary services while increasing device utilization factor. In this context, a combined active power‐sharing and grid current distortion enhancement‐based approach is proposed in this paper for three‐phase four‐wire (3P4W) grid‐connected solar photovoltaic (SPV) system. The DG is uniquely controlled by multifunctional photovoltaic inverter to autonomously acquire the following multifunctionalities: (a) active power‐sharing feature to govern the power flow between the SPV unit and utility grid based on the availability of active power at direct current (DC)–bus terminal; (b) shunt active power filter (SAPF) with functionalities of source current harmonic attenuation, load reactive current compensation, and zero sequences harmonic component mitigation, in addition to unity power factor (UPF) operation; and (c) to supply constant power to the electrical loads during solar intermittency. The proposed control systems of the DG mainly consist of the fundamental load current decomposition (FLCD) loop, active and reactive power components extractor, and source current balancing compensator. By adopting the proposed FLCD‐based approach, the fundamental load current is precisely detected while diminishing the computational intensiveness. In this study, an incremental conductance (INC)–based maximum power point (MPP) tracker has been realized using an Arm Cortex M4 microcontroller (STM32F407VGT). The multifunctionalities are demonstrated through exhaustive MATLAB/Simulink simulation results and are also validated by developing a laboratory prototype using dSPACE 1104 control platform.

Photovoltaic system operation as DSTATCOM for power quality improvement employing active current control

“…A 3P4 W topology is used to serve both single, as well as threephase load demands simultaneously in the electric distribution system. In addition, it exhibits an intrinsic characteristic to control the flow of neutral current directly [27]. The DC-bus capacitor and interfacing inductor are two major passive elements deployed in the proposed configuration to accomplish the various functions.…”

Electronically coupled photovoltaic system with grey wolf optimizer enabled DC ‐link voltage control loop

“…As a result, it fails to ensure satisfactory performance during dynamic conditions. 32 In contrast, when the DC-link VCL is operated with the classical PSO-PI and DC-PI, it leads to sluggish dynamic response during the integration of AHF. Interestingly, the analysis of Figures 6C,D also reveals that the grid current THD spectra during the PV inverter operation violate the THD limit as described in IEEE 519-2014.…”

“…The corresponding experimental setup is depicted in Figure 10. 32 The steady-state and dynamic response of the proposed electronically coupled PV system is validated in a discrete domain through dSPACE-1104 based control platform. The three-phase voltage and current signals along with DC-link voltage have been sensed and utilized to realize the closed-loop control scheme.…”

Power management algorithm for a conservative power theory battery storage based multi‐functional three phase grid connectedPVinverter

“…Multi‐functional GCIs are gaining significant importance because of their capabilities to compensate harmonics, reactive power, unbalance, and neutral currents along with active power injection to the distribution system. The detailed review of the state of the art on multi‐functional GCI topologies and control strategies reported in the literature have been described in detail with its contributions and the research gaps in Table 1 11‐39 . All previously mentioned research studies discussed in Table 1 demonstrated their efficacy and legitimacy.…”