- Stand-by Power Supply
- Smart Grid
- Photovoltaic Power Generation
- Wind Power Generation
The output power of a photovoltaic power generation system is characterized by its inconsistency and uncertainty due to day/night and weather changes. Large scale integration may exert periodic impacts to the power grid and affect power supply quality. The power grids are usually equipped with thermal power generating units to strengthen its capacity of rapid response and frequency regulations to ensure their safe and stable operations. However, thermal power generating units are known to be polluting and inefficient in regulating power supply.
As a safety measure for photovoltaic to power grid integration, the photovoltaic station must have power regulation functions and can control the output of active and reactive power according to frequency and dispatching instructions. The regulations for frequency and peak-load and backup must also be available to ensure safe and stable operations of the power system.
Any faults or disturbances at the power grid may result in voltage dip at the integration point with a photovoltaic power station and in serious cases, this may lead the power grid to break down. Therefore, a photovoltaic power generating unit must have certain LVRT capacity, i.e. the photovoltaic power generating unit must be able to operate continuously without going offline within certain range of voltage dip and timescale.