Data from transmission system operator MAVIR shows that solar energy production in Hungary reached a new peak on June 13, producing enough energy to serve the country's domestic electricity requirements entirely from renewables. Hungary has deployed almost 8 GW of solar capacity, according to the country's deputy minister of energy, Gàbor Czepek.
Another renewable source utilized in large amounts in Hungary is biomass. The NECP proposes a significant increase in solar PV capacity but no increase in wind power capacity. Wind power capacity expansion has been blocked by the government for more than ten years, a ban that is without reasonable geographic or economic reasoning [ 8, 9 ].
Wind and solar resources should receive more attention in the planning of the Hungarian energy transition. However, the expansion of these vRES needs to happen simultaneously with the restructuring of the whole system [ 27 ].
The input data to the model is derived mainly from national energy balance and other freely available databases which makes the approach easy to adapt and replicate. The following conclusions and recommendations are relevant to the Hungarian energy system.
Figure 1 shows the structure of a wind-solar-hydro-thermal-storage multi-source complementary power system, which is composed of conventional units (thermal power units, hydropower units, etc.), new energy units (photovoltaic power plants, wind farms, etc.), energy storage systems, and loads.
The dynamic operation of the system satisfies the energy conservation constraint, that is, the difference between the wind-solar complementary output power generation and the grid-connected power is adjusted by the hybrid energy storage module, which can be expressed as Eq. 26: (2) Equipment operation constraints.
Wind-solar-hydro complementary potential shows great temporal and spatial variation. Renewable complementarity can improve China's future power system stability. In the context of carbon neutrality, renewable energy, especially wind power, solar PV and hydropower, will become the most important power sources in the future low-carbon power system.
The system's operational process is illustrated in Figure 1. The key equipment of this system includes wind turbines, photovoltaic generators, alkaline electrolyzers, pressure hydrogen storage equipment, battery equipment, and fuel cells. FIGURE 1. Wind-solar hydrogen coupling multi-energy complementary system.
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