Abstract:Z-source inverter photovoltaic system is a single-stage system, which has buck/boost characteristic. It achieves maximum power point tracking (MPPT) with control shoot-through duty cycle, while fulfills the grid-connection with modulation index control. This paper presents a single-stage control technique for Z-source inverter based PV system. The new unified vector is composed of the traditional vector U and the boost factor , which allows the desired vector to be located anywhere without limitation of the dc input voltage. The output voltage of Z-source inverter can faithfully follow the reference voltage regardless of the variable dc-link input voltage. It increases modulation index M, full utilizes the dc-link input voltage, decreases voltage stress of the active devices and improves the harmonics in output current of the inverter. The theoretical analysis is verified by simulation and experimental results.
丁新平, 卢燕, 钱照明, 张民, 杨水涛. Z源逆变器光伏并网系统光伏电池MPPT和逆变器并网的单级控制[J]. 电工技术学报, 2010, 25(4): 122-128.
Ding Xinping, Lu Yan, Qian Zhaoming, Zhang Min, Yang Shuitao. Single-Stage Control of MPPT and Grid-Connected on Z-Source Inverter PV System. Transactions of China Electrotechnical Society, 2010, 25(4): 122-128.
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