Abstract
Microgrids (MGs) are developing owing to the rapidly growing distributed power generation systems. The MG controls the flexibility of the network to ensure the requirements of reliability and power quality are satisfied. A typical MG normally consists of dispersed generation resources, which are connected by power electronic inverters, storages, and non-linear loads. This study deals with a compensation control method of a photovoltaic grid-connected inverter using unity power factor (UPF) strategy in MG. In this case, the proposed control method can provide output currents without distortion and with the UPF. Further, it is able to increase the inverter output current to approximately 19 times of the value obtained conventionally. The proposed control method can be applied to three-phase grid interfaced converters such as DG inverters and can also be easily integrated into the conventional control scheme without installation of extra hardware. A theoretical analysis is presented and the performance of the proposed control method for a grid-connected inverter in a MG is evaluated through simulation results.
Highlights
Since the late 1980s, power quality is an important parameter for electrical companies and customers wo require high and low voltages
This paper presents a compensation control method for the PV grid-connected inverters (GCIs) using unity power factor (UPF) strategy in the MG
One of the power quality problems in MGs is the THD of the interface inverter for the current exchanged with the grid
Summary
Since the late 1980s, power quality is an important parameter for electrical companies and customers wo require high and low voltages. Even though the utilization of renewable energy sources (RESs) adds complexity to the aforementioned optimality condition, they offer various technical, economical [3], and environmental [4] advantages Such benefits might be in the form of reducing line losses, improving voltage profiles, enhancing power quality, shaving demand peaks, increasing system reliability, and rising grid security [5]. With the widespread use of harmonic generating devices, the control of harmonic currents to maintain a high level of power quality is becoming increasingly important While facing these challenges, an effective method for harmonic suppression is the harmonic compensation achieved by using passive/active power and hybrid compensator filters. The performance of the proposed control is demonstrated using computer simulations and verified using a real control method for a GCI in the MG for simultaneous reference power injection and harmonics rejection
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