The neutral point clamped quasi- Z -source (NPC-qZS) inverter is poised to become a potential candidate for renewable energy applications because it yields a continuous input current and voltage boost. In this study, the closed-loop control of grid-tied three-phase (3- $\phi $ϕ ) NPC-qZS inverter, fed with renewable energy sources, is proposed for the first time. A dynamic model has been developed to accurately design the control strategy. The proposed strategy includes the control of grid-tied current and the peak dc-link voltage (PDV). The control of grid-tied current is achieved through a damped-second-order-generalised integrator. The PDV is estimated indirectly from the voltages of qZS network capacitors and is regulated by an integral-double-lead controller. Two modified modulation techniques based on phase-opposite disposition and in-phase disposition are proposed to yield shoot through by injecting 3rd harmonics for maximum constant boost control. A comparison is drawn between the performance of the proposed controller and sliding-mode controller on the dc side. The controller design and system performance are validated through real-time simulation and experimentation on a practical setup in the laboratory.

中文翻译：

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三级NPC-q的调查ž基于逆变器的并网可再生能源系统

中性点钳位准 ž 源（NPC-qZS）逆变器将产生连续的输入电流和升压，因此有望成为可再生能源应用的潜在候选者。在这项研究中，并网三相（3- $ \ phi $ϕ ）首次提出了采用可再生能源供电的NPC-qZS逆变器。动态模型已经开发出来，可以准确地设计控制策略。提议的策略包括控制并网电流和峰值直流链路电压（PDV）。并网电流的控制通过阻尼二阶广义积分器实现。PDV由qZS网络电容器的电压间接估算，并由一个集成双引线控制器调节。提出了两种基于相位相反配置和同相配置的改进调制技术，通过注入三次谐波来产生击穿，以实现最大的恒定升压控制。在建议的控制器和直流侧的滑模控制器的性能之间进行了比较。