Abstract
The battery energy-stored quasi-Z-source (BES-qZS)-based photovoltaic (PV) power generation system combines advantages of the qZS inverter and the battery energy storage system. However, the second-harmonic (2ω) power ripple degrades the system's performance and affects the system's design. An accurate model to analyze the 2ω ripple is very important. The existing models did not consider the battery, or assumed a symmetric qZS network with L-1= L-2 and C-1= C-2, which limits the design freedom and causes oversized impedance parameters. This paper proposes a comprehensive model for the single-phase BES-qZS-PV inverter system, where the battery is considered and there is no restriction of L-1= L-2 and C-1= C-2. Based on the built model, a BES-qZS impedance design method is proposed to mitigate the 2ω ripple with asymmetric qZS network. Simulation and experimental results verify the proposed 2ω ripple model and impedance design method.
Original language | English |
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Article number | 8030146 |
Pages (from-to) | 3198-3209 |
Number of pages | 12 |
Journal | IEEE Transactions on Industrial Electronics |
Volume | 65 |
Issue number | 4 |
DOIs | |
State | Published - Apr 2018 |
Funding
Manuscript received September 11, 2016; revised January 2, 2017 and April 9, 2017; accepted May 16, 2017. Date of publication September 8, 2017; date of current version January 5, 2018. This work was supported by the Qatar National Research Fund (a member of Qatar Foundation) under NPRP-EP Grant X-033-2-007. The statements made herein are solely the responsibility of authors. (Corresponding author: Weihua Liang.) W. Liang is with the School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China (e-mail: [email protected]).
Keywords
- Battery energy storage
- photovoltaic power system
- quasi-Z-source inverter
- second-harmonic ripple model