Harmonic Loss Analysis of Low-Voltage Distribution Network Integrated with Distributed Photovoltaic

In a power system with highly proportional renewable energy integration, the power generated by photovoltaic (PV) of high permeability and high proportion needs to be connected to the distribution network through the power electronic inverter. The inverters can generate the low-order harmonic and hi...

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Bibliographic Details
Published in:Sustainability 2023-03, Vol.15 (5), p.4334
Main Authors: Yuan, Wenqian, Yuan, Xiang, Xu, Longwei, Zhang, Chao, Ma, Xinsheng
Format: Article
Language:English
Subjects:
Alternative energy sources
China
Decoupling
Electric current regulators
Electric potential
Electric power systems
Evaluation
Harmonic distortion
Inverters
Management
Permeability
Photovoltaics
Power flow
Resistance factors
Skin
Solar energy
Voltage
Voltage regulators
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Summary:In a power system with highly proportional renewable energy integration, the power generated by photovoltaic (PV) of high permeability and high proportion needs to be connected to the distribution network through the power electronic inverter. The inverters can generate the low-order harmonic and high-order harmonic near the switching frequency. Harmonic power will be generated when the harmonic current flows through the power grid with the harmonic voltage of the same frequency, and the additional harmonic losses caused should not be neglected. To effectively analyze the voltage quality and calculate the harmonic loss of the low-voltage distribution network integrated with distributed PV, based on the harmonic loss factor of resistance proposed, the harmonic impedance modeling and harmonic loss calculation method for the key equipment of the power grid, such as lines and transformers, are introduced in this paper firstly. Next, a decoupling algorithm of harmonic power flow is proposed, and the influence of the access capacity of PV on voltage quality and line loss of the distribution network is analyzed. Finally, a harmonic loss calculation method based on measured harmonic data of the distribution network is proposed. It is found that the harmonic loss of the low-voltage distribution network accounts for about 0.6% of the total network loss. Therefore, voltage quality can be improved and line loss can be reduced effectively by reasonable access to PV and reducing harmonic order and the current harmonic distortion.
ISSN:2071-1050
2071-1050
DOI:10.3390/su15054334