Purpose

A new control method is proposed for grid integration of improved hybrid three quasi z source converter (IHTQZSC). The proposed controller provides a constant switching frequency with an improved dynamic response with fewer computations. The proposed constant switching frequency predictive controller (CSF-PC) does not need weighting factors and reduces the complexity of the control circuit.

Design/methodology/approach

A single PI controller is intended to control voltage across dc-link by generating the necessary shoot-through duty ratio. The predictive controller produces the modulating signals required to inject the desired grid current. The performance of the proposed controller is validated with MATLAB/Simulink software.

Findings

The discrete-time instantaneous model on the grid side in the proposed controller influences the inductor current with minimum ripples. Dynamic response and computational complexity of the converter with the PI controller, finite set model predictive controller (FS-MPC) and the proposed controller are discussed.

Practical implications

The converter belongs to impedance source converters (ISC) family, delivers higher voltage gain in a single-stage power conversion process, extract the energy from the intermittent nature of renewable energy conversion systems. Implementing CSF-PC for ISC is simple, as it has a single PI controller.

Originality/value

Grid integration of high voltage gain IHTQZSC is accomplished with PI, FS-MPC and CSF-PC. Though the FS-MPC exhibits superior dynamic response under input voltage disturbance and grid current variation, total harmonic distortion (THD) in the grid current is high. CSF-PC provides better THD with a good dynamic response with reduced inductor current ripples.

中文翻译：

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基于CSF-PC的并网改进型混合三准Z源转换器

目的

一个新的控制方法，提出了一种改进的混合3准的电网整合ž源转换器（IHTQZSC）。所提出的控制器以较少的计算量提供了具有改善的动态响应的恒定开关频率。所提出的恒定开关频率预测控制器（CSF-PC）不需要加权因子，并降低了控制电路的复杂性。

设计/方法/方法

单个PI控制器旨在通过生成必要的直通占空比来控制直流链路两端的电压。预测控制器产生注入所需电网电流所需的调制信号。所提出的控制器的性能已通过MATLAB / Simulink软件进行了验证。

发现

提出的控制器中电网侧的离散时间瞬时模型以最小的纹波影响电感器电流。讨论了带有PI控制器，有限集模型预测控制器（FS-MPC）和所提出的控制器的转换器的动态响应和计算复杂性。

实际影响

该转换器属于阻抗源转换器（ISC）系列，在单级功率转换过程中提供更高的电压增益，从可再生能源转换系统的间歇性中提取能量。为ISC实现CSF-PC很简单，因为它具有单个PI控制器。

创意/价值

PI，FS-MPC和CSF-PC实现了高电压增益IHTQZSC的电网集成。尽管FS-MPC在输入电压干扰和电网电流变化下表现出出色的动态响应，但电网电流中的总谐波失真（THD）很高。CSF-PC可提供更好的THD，并具有良好的动态响应并减少了电感器电流纹波。