NDLI: Operating-point insensitive voltage control of the Z-source inverter based on an indirect capacitor current control

Content Provider	IET Digital Library
Author	Lee, Kwang Woon Kim, Taehyung
Abstract	This study presents a novel design strategy for the capacitor voltage control of a Z-source inverter (ZSI) to overcome the complexity and control performance degradation involved with the conventional small-signal model-based controls. In the proposed approach, the Z-network capacitor voltage of the ZSI is controlled through the average capacitor current over a switching period, and thus, the dynamics of the Z-network capacitor voltage can be easily controlled. To make this happen, the average capacitor current model is derived based on an important finding that the average capacitor current can be indirectly controlled through the average Z-network inductor current. For the inner Z-network inductor current control, the average voltage model of the inductor is developed to control the average inductor voltage directly via the shoot-through duty ratio of the ZSI. In this way, the current control dynamics can be linearised over an entire operating range and the desired bandwidth of each controller can be simply obtained using only Z-network parameters without a gain tuning process unlike the small-signal model-based controls. Thus, the proposed method can simplify the design process while producing an excellent control performance. The simulation and experimental results verify that the transient responses exactly coincide with the desired design goal.
Starting Page	1358
Ending Page	1366
Page Count	9
ISSN	17554535
Volume Number	8
e-ISSN	17554543
Issue Number	Issue 8, Aug (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/8/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2014.0463
Journal	IET Power Electronics
Publisher Date	2015-04-08
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Capacitor Capacitor Voltage Control Control of Electric Power System Current Control Current Control Dynamics Electric Current Control Indirect Capacitor Current Control Invertors Operating-point Insensitive Voltage Control Power Electronics Power Supply Small-signal Model-based Control Supervisory Circuit Transient Response Voltage Control Z-network Capacitor Voltage Z-network Inductor Current Control Z-source Inverter ZSI
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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