On the one hand, because the PV power generation is controlled by the maximum power point tracking strategy, the output power is directly related to the solar irradiance and the ambient temperature, and the solar irradiance is not a stable value with time, weather and many other factors. Therefore, the output of photovoltaic power generation in the day also has a greater volatility. Large volatility will lead to the PV system voltage fluctuations, voltage flicker, frequency fluctuations and a series of power quality problems.
Among them, the photovoltaic power generation system through the power electronic devices to achieve power conversion and grid operation. In this process, the inverter high-frequency characteristics and non-linear characteristics will have more harmonic and DC components, affecting the user power quality. Damage to user equipment, resulting in economic losses.
On the other hand, the existence of harmonic and unbalanced negative sequence components in the power grid will lead to the output of photovoltaic power system active power and output current distortion will affect the normal operation of photovoltaic grid-connected inverter.
Influenced by various factors, the output power of photovoltaic power generation system is characterized by discontinuity and uncertainty, among which meteorological conditions are the most significant.
The influence of harmonic and unbalanced negative sequence components on the output power and output current of PV system. Under the condition of different voltage distortion rate of power grid shows the contradictory harmonic and unbalanced negative sequence components in the grid will lead to the fluctuation of the active power output of the PV system. The higher the grid voltage distortion rate is, the lower the active power output of the PV system will be. The higher the distortion rate of the grid voltage, the PV system output current THD is bigger.
Nice post!!!Thanks for share.
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