To understand photovoltaic systems, you should understand a few basic concepts:
Calculation of power generation
Power generation (kWh)= total installed capacity of solar modules (kW)x solar irradiation intensity (kWh/m squared)x power generation efficiency of photovoltaic system
Calculation of investment return period
Payback period (years)= total cost of photovoltaic system one year of electricity savings
Calculation of total installed capacity
Total installed capacity (kW)= installed capacity of a single solar module (kW)x number of solar modules
Calculation of saving electricity
Electricity cost saved per year (Yuan)= annual average power generation per day (kWh)x Electricity price (yuan /kWh)x power generation days (days)
Centralized photovoltaic location elements
In addition, due to the large installed capacity of centralized grid-connected photovoltaic power stations, land occupation must be substantial, and land sites are usually relatively remote, given the nature of the land.
Generally, land, water, etc., are occupied, and the new land mode ground-type site selection constantly expands.
The site selection of the ground station is concentrated in mountains, beaches, swamps, Gobi, deserts, contaminated land, and other idle or abandoned land. Once the relevant procedures are completed, the construction is sustainable and enjoys the national benchmark electricity price subsidy, so the income is stable.
Optical array inclination design
In the design of a distributed photovoltaic power station, many factors influence the comprehensive inclination design of the photovoltaic array, and because distributed photovoltaic power plants must integrate different architectural design forms, most cannot be designed to the optimal tilt angle.
The main factors for consideration in the inclination design of a distributed photovoltaic array include:
- Tilt Angle under the condition of maximum power generation;
- Reasonable inclination Angle and orientation of the installation form combined with the supporting building
Capacity ratio
The ratio of module capacity to inverter capacity of photovoltaic power station.
(Capacity ratio = installed capacity of photovoltaic system/rated capacity of photovoltaic system), increasing the appropriate capacity ratio in a certain range can improve the utilization rate of other equipment, dilute the investment cost, reduce the construction and power generation cost, and also make the output smoother and improve the friendliness of the grid.
Photovoltaic low-voltage ride-through technology
It means the point at which the grid fails or a disturbance is created due to photovoltaic power station junction-voltage fluctuations, the photovoltaic power station can be connected to the grid without interruptions to operation within the enclosure.
Installed capacity
After packaging and protection in series, solar cells can form a large area of solar cell modules.
Together with the power controller and other components to form a photovoltaic power generation device, the generating power of this device is the installed capacity.
Popular science
Photovoltaic effect
It is called the photovoltaic effect. The absorption of photons by an object causes electromotive force. When an object is exposed to light, the charge distribution inside the object changes and produces an effect of electromotive force and current
Photovoltaic power generation
Photovoltaic power generation technology, which converts solar energy directly into electric energy by using the photovoltaic effect.
Unit
Watt (W), kilowatt (KW), megawatt (MW), giga watt (GW), terawatt (TW)
Calculation formula
1TW=1000GW=1000000MW=1000000000KW=1000000000000W
1MW=1000KW
A unit of energy for electricity
Kilowatt-hour (KWh) A kilowatt-hour of electricity is one kilowatt-hour of electricity.