Villa solar photovoltaic power generation grid-connected system for future power grid development

The impact of villa solar photovoltaic power generation grid-connected system on future power grid development:
1. Impact of load peak and trough on power grid. Because the villa solar photovoltaic power generation grid-connected system does not have the capacity of peak frequency regulation, it will affect the early peak load and late peak load of the power grid. The increase in electricity generated by grid-connected solar photovoltaic systems does not reduce the ownership of conventional rotary units. The power grid needs to prepare a large number of rotating standby units for the photovoltaic power generation system to solve the problem of peak load balancing in the morning and evening. Grid-connected solar photovoltaic systems feed power to the grid at the cost of using less time per unit, which is certainly something that power producers do not want.
2. The influence of day and night change, east-west time difference and seasonal change on the power grid. Due to the periodicity of sunshine and load, the increase in power generation of grid-connected solar photovoltaic systems does not reduce the demand for installed grid capacity.
3. Changes in meteorological conditions. When the grid-connected rooftop power generation of the villa reaches a certain scale in the city, the grid will provide the grid-connected photovoltaic system with enough regional rotating standby units and reactive power compensation capabilities to control and adjust the frequency and voltage of the system when major changes occur in geography and weather. In this case, the power grid will sacrifice the economic operation mode to ensure the safe and stable operation of the power grid.
4. Long-distance photovoltaic power transmission. When the villa solar photovoltaic power grid system in the economy and technology to achieve long-distance transmission, because there is no rotating inertia, governor and excitation system, will bring new stability problems to the AC power grid. If the scale of photovoltaic grid-connected power generation is large, the use of high-voltage AC-DC transmission will bring stability and economic problems to the AC system adjacent to the photovoltaic grid-connected transmission system. Inefficient transmission lines for grid-connected photovoltaics limit the use of desert solar power. Due to the low load rate, the transmission lines used to pass or combine grid-connected solar photovoltaic systems are not economical), photovoltaic grid-connected power stations must be equipped with automatic reactive voltage regulation devices regardless of the use of high-voltage AC-DC transmission.
5. One of the main advantages of connecting villa solar photovoltaic power to the grid is that it can replace the consumption of fossil fuels. Because grid-connected photovoltaic power generation increases the rotational reserve or thermal reserve of the rotating generator in the power plant, the energy lost by rotational reserve or thermal reserve needs to be deducted from the actual consumption reduction rate of grid-connected photovoltaic power generation. The reduction in the efficiency of grid-connected photovoltaic power generation should take into account the efficiency loss caused by the reduction in the utilization hours of the generator set of the power generation company due to the power provided by the grid-connected solar photovoltaic power generation system. Because the power system operates as a whole, grid-connected photovoltaic power generation may harm the interests of other power generation enterprises, which is an issue that policymakers need to consider. Therefore, the theoretical standard loss reduction corresponding to the total amount of grid-connected photovoltaic power generation in the system should be multiplied by a coefficient less than 1, and the auxiliary power loss of the rotating standby unit should be subtracted in equal proportion.
6. Environmental protection; Whether the emission reduction effect brought by grid-connected solar photovoltaic power generation only considers the sulfur dioxide and carbon dioxide emitted by thermal power generation remains to be studied, because when photovoltaic power generation is connected to the grid, the grid also considers the safety, stability and economic operation of the grid, often not only reducing the output of thermal power plants, but also considering the rotation backup.