Abstract
An object of research is a diesel power supply system of the decentralized village of Tokma, Irkutsk Region, Russia. The objective is to increase the contribution of the PV part of a photo-diesel electrical system operating in parallel with a diesel power plant to a stand-alone distribution network of DC compared to parallel PV and diesel stations operating on AC; quality improvement and voltage stabilization in the electrical network; cost reduction of generated electricity. Optimization of the characteristics of a stand-alone power supply system at a DC is a difficult task, due to the impossibility of conducting tests in a real electric power system, and the use of physical modeling because of its extreme complexity. Given this fact, the task is to design software and hardware tools for optimizing the parameters of a DC photo-diesel power system. The developed models use MS Excel, MatLab/Simulink software packages, as well as weather data bases. A software tool has been developed that allows for simulation modeling of operating modes of photo-diesel power supply systems, generation, consumption and insolation level of a decentralized consumer, as well as determining rational technical and economic parameters; criteria of expediency and efficiency of constructing photo-diesel electric systems with DC have been identified. As a result, the level of voltage drop is reduced compared to the AC power supply system, the cost of 1 kWh of electrical energy is lower than in the AC power supply system, and the negative environmental impact is reduced.
Highlights
The overwhelming majority of decentralized power systems are built on diesel generators operating on AC
The indicators are divided into three groups, which have a significant impact on the decision making towards the development of a microgrid project based on a photodiesel system and its transfer to DC
When a diesel power plants (DPP) operates without a PV power plant, we observe that the voltage level at the end of the transmission line is below the set threshold for all seasons of the year
Summary
The overwhelming majority of decentralized power systems are built on diesel generators operating on AC. Diesel fuel for such generators is an expensive resource not always readily available in remote rural areas. The price of electricity for consumers in regions with a decentralized power supply is much higher than the price for those who are connected to a centralized network (approximately from 15 to 600 rubbles, as opposed to 0.97 to 8.2 rubbles per 1 kWh, respectively). Reasons for high electricity prices in regions with decentralized access are high transportation costs, escalating fuel prices, poor maintenance of generating equipment and variable load, which leads to inefficient conditions of operation of power equipment and significant losses of electricity.
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