Control Strategy of Intergrated Photovoltaic-UPQC System for DC-Bus Voltage Stability and Voltage Sags Compensation

Dongsheng Yang, Zhanchao Ma, Xiaoting Gao, Zhuang Ma and Enchang Cui
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Dongsheng Yang: College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
Zhanchao Ma: College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
Xiaoting Gao: College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
Zhuang Ma: State Grid Shenyang Electric Power Supply Company, Shenyang 110811, China; zhuang mild@163.com
Enchang Cui: College of Information Science and Engineering, Northeastern University, Shenyang 110819, China

Energies, 2019, vol. 12, issue 20, 1-21

Abstract: Power quality problem, because of its various forms and occurrence frequency, has become one of the most critical challenges confronted by a power system. Meanwhile, the development of renewable energy has led to more demands for an integrated system that combines both merits of sustainable energy generation and power quality improvement. In this context, this paper discusses an integrated photovoltaic-unified power quality conditioner (PV-UPQC) and its control strategy. The system is composed of a series compensator, shunt compensator, dc-bus, and photovoltaic array, which conducts an integration of photovoltaic generation and power quality mitigation. The fuzzy adaptive PI controller and the improved Maximum Power Point Tracking (MPPT) technique are proposed to enhance the stability of dc-bus voltage, which is aimed at the power balance and steady operation of the whole system. Additionally, the coordinate control strategy is studied in order to ensure the normal operation and compensation performance of the system under severe voltage sag condition. In comparison to the existing PV-UPQC system, the proposed control method could improve the performance of dc-bus stability and the compensation ability. The dynamic behavior of the integrated system were verified by simulation in MATLAB and PLECS. Selected results are reported to show that the dc-bus voltage was stable and increased under severe situations, which validates the effectiveness of the proposed integrated PV-UPQC system and its control strategy.

Keywords: power quality; solar photovoltaic; unified power quality conditioner; fuzzy adaptive control; coordination control; voltage sag (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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