An improved control strategy of grid‐tied solar photovoltaic system using active current detection method

Summary The paper presents a new configuration of a grid‐connected converter centering on the needs of voltage‐sensitive nonlinear loads with source current compensation and photovoltaic (PV) power injection capability. The presented system consists of a six‐switch converter, which gives dual single‐phase output. The first output is connected in shunt near the source end to inject PV‐generated power along with the supply of load current harmonics and reactive power. The second output forms a series connection near the load end to protect the voltage‐sensitive nonlinear load from supply‐side voltage variations such as sags and harmonics. The system operation is validated through MATLAB simulation and real‐time simulation using Opal‐RT (OP4510) under different dynamic conditions such as variations in supply voltage, variation in solar irradiance, and load variation which is typically encountered in a modern distribution network. The performance of the proposed multifunctional converter is found to be satisfactory in all operating conditions by meeting the desired PV power injections along with the compensation of sensitive nonlinear load terminal voltage and source current harmonic issues within the standard allowable limit specified by IEEE.

Section: Shunt Converter Reference Generationmentioning

confidence: 99%

“…Recently, with the increased use of distributed generation, multifunctional systems were proposed to improve PQ with energy generation 12–18 . This multifunctional system is used to improve the utilization factor of a grid‐connected system.…”

Section: Introductionmentioning

confidence: 99%

A new configuration of grid‐connected photovoltaic‐based multifunctional power converter for single‐phase system

Dongre

Mishra

Majji

2022

“…The generator‐side ports need to be controlled so that the produced active power of every wind turbine is independently captured and injected into DC link. For this purpose, a conventional PQ control scheme in the synchronous coordinate is utilized as shown in Figure 13 44,45 …”

Section: Renewable Energy Integration Using Ssvm‐based Multileg Conve...mentioning

confidence: 99%

“…For this purpose, a conventional PQ control scheme in the synchronous coordinate is utilized as shown in Figure 13. 44,45 Two different wind speed profiles are considered to be applied for verifying the independent control of the wind turbines. The simulation results carried out using MATLAB/Simulink are illustrated in Figure 14.…”

Section: Renewable Energy Integration Using Ssvm-based Multileg Conve...mentioning

confidence: 99%

A novel multiport converter switching scheme to integrate multiple renewable energy sources

Bizhani

Techato

Noroozian

et al. 2022

Summary In this paper, an innovative switching scheme named simultaneous space vector modulation (SSVM) is proposed for integrating various AC sources in the energy industry using a unified multiport converter. The proposed SSVM technique is applied to the multileg topology of a multiport converter, which is an encouraging option for the grid integration of renewable energy sources and multimachine drives. Considering the shared leg in the multileg converter, the proposed SSVM can utilize the utmost simultaneous switching states between different ports, resulting in lower switching loss and better DC‐link voltage utilization compared with the conventional sequential space vector modulation approach. A novel decision matrix concept is introduced to identify the simultaneous switching states. For this aim, according to the number of ports of the multileg converter, decision matrices containing valid simultaneous switching states are first calculated. Then, they are defined as look‐up tables in the proposed SSVM to be retrieved and exploited in every sampling period. The effectiveness of the proposed SSVM for a seven‐leg version of the multileg converter is assessed using the simulation analysis and real‐time validation. The capability of the proposed SSVM‐based multiport converter in grid integration of AC renewable energy sources is also verified considering two permanent magnet synchronous generator (PMSG)‐based wind turbines with real wind speed patterns. The simulation results confirm that the proposed SSVM is properly able to manage the power flow between different ports and improve the DC voltage utilization and switching loss compared with the sequential SVM.

“…In the last decade, a new reactive power compensation approach named PV‐STATCOM in which the inverter's unoccupied capacity after delivering the generated active power to the grid is utilized for reactive power compensation is introduced in the literature 16–18 . That approach, considering the VA capacity of the inverter used for grid connection of PV source, is adopted for different purposes, including power factor correction, 19 transmission line capacity increase, 20 regulating the grid voltage, 21 and mitigating the undesired effects of the transient disturbances 22 .…”

Section: Introductionmentioning

confidence: 99%

A new reactive power compensation concept for distribution systems using a grid‐integrated hybrid photovoltaic/wind turbine system: PV‐WT‐STATCOM

Akbari

Taheri

et al. 2022

In this paper, a new concept based on an integrated hybrid energy system including photovoltaic (PV) and wind turbine (WT) for reactive power support of the grid is presented. Considering the shared grid-side converter in hybrid energy systems, which is preferably responsible for delivering active power to the grid, the remaining capacity of the converter after providing active power management is utilized as a static synchronous compensator (STATCOM) to overcome the power quality problems in the main grid. For this aim, a new concept named PV-WT-STATCOM is proposed, and a flexible control scheme is accordingly designed, which enables a sufficient reactive power compensation in both steady and transient states. The steady-state issues in the main grid are resolved using the remaining capacity of the shared inverter. In the transient mode, where a large amount of reactive power is probably needed for restoring the grid-side voltage while the unoccupied capacity of the shared inverter is not sufficient, a new control strategy is developed for reducing the PV's generated power, and providing more unused capacity in the shared inverter. The effectiveness of the proposed configuration in handling reactive power compensation in both steady and transient states are carried out using MATLAB/Simulink. The extensive simulation results in presence of the variable weather conditions confirm that the proposed concept is properly able to improve grid-side power factor and voltage in steady and transient modes, respectively, without requiring any additional STATCOM.