## 4 System Structure and Initial Data  
We consider a stand-alone system, including photovoltaic cells (PVC or PV), wind turbines (WT), battery storage (BAT), an inverter (INV), a wood fuel gasification power plant (GPP), and a diesel power plant (DPP) as a backup and peak load power source (Figure 3). The GPP uses the technology of wood waste gasification and includes the following: a gasification module (gasifier to produce gas from wood waste); a tank for storingthe produced synthesis gas (gas-holder); a generation module with a power generator running on this gas.  
The GPP uses either shredded wood waste or wood briquettes (pellets and pellet fuels) as fuel [11]. Thermochemical conversion of wood fuel into synthesis gas takes place in the gasifier. Syngas is a mixture of different gases, with the main combustible components being carbon monoxide and hydrogen.  
The DPP is used as a backup and peak-shaving power source due to the limited maneuvering capacity of the GPP. The DPP is usually switched on at times when renewable energy generation is insufficient to cover the electric load and storage batteries are discharged.  
The main factors determining the economic performance of renewable energy sources are the following: the potential and reserves of the corresponding natural resource; capacity and load profile; technical and economic performance of power plants; the price of wood fuel.  
This study considers a variable load with a maximum of 1 MW and a capacity factor of 0.52. The maximum load is in the evening hours, at right the load is 10% of the maximum load. Such parameters are typical of small local energy systems in the Baikal region.  
The technical and economic performance indicators of the system components [96; 97; 8; 10; 11; 19] are shown in Table 5. Due to the volatility of the rule exchange rate, capital expenditures are expressed in U.S. dollars (in fixed prices as of the beginning of 2020). In the previous work [10], based on the literature analysis, technical and economic indicators of power plants were set in the form of uncertainty intervals to factor in errors in some parameters. In this paper, we mostly focus on the dynamics of power systems and system effects and use the most probable average values of the parameters.  
When forming options to be calculated, the task was to take into account the diversity of conditions of RES operation with a minimum number of points under consideration. Within the territory of the Baikal region, one distinguishes provisionally between three regions (south, center, and north) with their characteristic values of the number of maximum load hours and fossil fuel prices [96; 97; 8]. The average annual wind speed at a height of 10 m varied from 3 to 6 m/s (the highest speed is in the center), the annual solar radiation incident on a horizontal surface--from 1000 to 1400 kW\(\cdot\)h/m\({}^{2}\).  
Figure 3: The structural diagram of the power supply system.  
Meteorological data on the solar radiation and wind speed for this research were taken from reference books on climate and used according to the approach developed in [8].  
The price of woody biomass is determined by a significant number of factors specific to a given area. Most of the wood fuel resources are concentrated in the northern parts of the country, with much less in the south [11]. For the calculations, we assumed the typical regional value of the price of wood fuel of 50-90 USD/toe.