What is the configuration of the large scale centralized grid connected photovoltaic power station?
Photovoltaic grid connected power generation systems can be divided into two types: user side grid connected and power generation side grid connected. The former grid connection point is generally on the low voltage side (380/220V), mainly for self-generation; or on the medium voltage side (10kV, 35kV), mainly for nearby consumption. Usually it is a reversible grid connected photovoltaic system, and some systems require reverse power protection (ie, an irreversible grid connected photovoltaic system).
Large scale centralized grid connected photovoltaic power plants are connected to the user side and the power generation side. Most of the power of 10MWp and above is connected to the power generation side. The “irreversible” grid connection method is adopted, and the current is unidirectional. It is not self-use and “net meter measurement”, only the feed-in tariff can be given. It is usually connected to 110kV or 220kV high-voltage output electric energy, and its output characteristic is a current source that changes with the grid rate and voltage, with a power factor of 1, and no reactive power is provided.
The configuration of a large scale centralized grid connected photovoltaic power station is mainly composed of solar photovoltaic arrays, inverter power adjustment and control devices, and grid access systems (booster transformers, AC circuit breakers, metering equipment), etc. in addition to the main equipment, the photovoltaic power station is equipped with a photovoltaic square array DC lightning protection combiner box, AC and DC power distribution system, detection, measurement, data acquisition and transmission, AC and DC cables, etc.