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

Wenqian Yuan, Xiang Yuan, Longwei Xu (), Chao Zhang and Xinsheng Ma
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Wenqian Yuan: State Grid Jibei Electric Power Research Institute, Beijing 100045, China
Xiang Yuan: State Grid Jibei Electric Power Company Limited, Beijing 100053, China
Longwei Xu: School of Electrical Engineering, Shandong University, Jinan 250061, China
Chao Zhang: State Grid Jibei Electric Power Research Institute, Beijing 100045, China
Xinsheng Ma: State Grid Jibei Electric Power Research Institute, Beijing 100045, China

Sustainability, 2023, vol. 15, issue 5, 1-23

Abstract: 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.

Keywords: distributed PV; distribution network; harmonic loss; measured data (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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