About Photovoltaic inverter reverse power consumption
Large solar photovoltaic (PV) penetration using inverters in low-voltage (LV) distribution networks may pose several challenges, such as reverse power flow and voltage rise situations. These challenges will eventually force grid operators to carry out grid reinforcement to ensure continued safe and reliable operations.
Large solar photovoltaic (PV) penetration using inverters in low-voltage (LV) distribution networks may pose several challenges, such as reverse power flow and voltage rise situations. These challenges will eventually force grid operators to carry out grid reinforcement to ensure continued safe and reliable operations.
High penetration of intermittent PV cause voltage fluctuations in grid, voltage rise and reverse power flow, power fluctuation in grid, variation in frequency and grounding issues. PV penetration in low voltage distribution network also causes harmonic distortion in current and voltage waveforms [10].
Voltage rise caused by reverse power flows and intermittency in renewable power is the main limiting factor for integration of photovoltaic (PV) generation in low voltage networks. Inverter voltage control techniques have been developed to provide effective voltage control and support higher penetration integration of PV generation.
In the time range of 0.2 s–0.25 s and 0.4 s–0.45 s under the proposed cloudy control mode, there were about 5 kVar additional reactive power consumption in PV inverter compared with the power factor control strategy. This was the reason why the cloudy control mode could effectively mitigate the fluctuations of V P C C.
The inverter can mitigate the reverse power flow by compensating for the reactive power . The inverter must satisfy the relation ≤ S , where, P , Q , and S are inverter’s real power output, var output, and rated capacity, respectively.
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