Open Access

ARTICLE

The Full Load Voltage Compensation Strategy in Capacity Configuration of UPQC Integrated PV-BESS

Fuyin Ni^1,2, Kai Li^2,*

1 Jiangsu Key Laboratory of Power Transmission & Distribution Equipment Technology, Jiangsu University of Technology, Changzhou, 213001, China
2 School of Electrical and Information Engineering, Jiangsu University of Technology, Changzhou, 213001, China

* Corresponding Author: Kai Li. Email:

Energy Engineering 2023, 120(5), 1203-1221. https://doi.org/10.32604/ee.2023.025796

Received 31 July 2022; Accepted 09 October 2022; Issue published 20 February 2023

Abstract

Unified power quality conditioner (UPQC) with energy storage is commonly based on conventional capacity configuration strategy with power angle control. It has problems such as phase jumping before and after compensation. DC-link cannot continuously emit active power externally. Therefore, this paper presents the compensation strategy of full load voltage magnitude and phase in capacity configuration of UPQC. The topology of UPQC is integrated a series active power filter (SAPF), a shunt active power filter (PAPF) and a photovoltaic-battery energy storage system (PV-BESS). The principle of full load voltage compensation is analyzed based on the PV-BESS-UPQC topology. The magnitude constant of load voltage is maintained by controlling the appropriate shunt compensation current. Then the UPQC capacity configuration is carried out using the full load voltage compensation strategy. The compensation capacity of UPQC series and shunt units are reduced. Finally, the simulation results show that the proposed compensation strategy reduces the capacity configuration by 5.11 kVA (36.4%) compared to the conventional compensation strategy. The proposed strategy can achieve full compensation of the load voltage, which can effectively reduce the capacity allocation and improve the economy of UPQC. It also has the PV-BESS units' ability of providing active power and can stabilize the DC-link voltage.

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