Advanced small‐signal‐based analytical approach to modelling high‐order power converters

Abstract

This study devises an advanced small-signal based approach (SSA) to model high-order power converter system (HOPCS); in detail, a 3-Z-network converter which employs a single switch to achieve high voltage gain is utilised as a typical example of HOPCS. Therein, four operating modes are detailed in terms of the states of electric current flowing through the inductors. The proposed SSA is performed by means of the state-space averaging technique and small-signal equivalent circuits in frequency domain. Based on the proposed approach, the derived transfer functions for input voltage, output voltage and control input yield deep insight into the dynamic responses of the converter in each working mode. In order to well validate the effectiveness of the proposed approach, numerical results and experimental prototype are conducted and measured, the results agree well with the theoretical analyses.

Three Electrolytic Capacitor Elimination Schemes in Quasi-Z-Source Converter: Theory and Experimental Verification

“…Take NEC-B-QZSC as an example. To obtain its small signal model, the state variable is defined as a matrix composed of inductor current and capacitor voltages using the state-space averaging method 33 , and the input variable is the input voltage, i.e.,…”

Nonlinear Time Series Analysis in Unstable Periodic Orbits Identification-Control Methods of Nonlinear Systems

“…Chaos, often encountered in reality, is the type of behavior considered to cause a malfunction or, not infrequently, the destruction of applications. Chaos [1,2] can also be advantageous, as it allows the generation of an infinite number of periodic or non-periodic behaviors using the same chaotic system [3,4] by applying small perturbations to a control parameter or system variable.…”

An extendable single‐switch n‐cell boost converter with high voltage gain and low components stress for renewable energy

“…High step‐up converters have been playing an indispensable role in modern renewable energy‐integrated power grid, but traditional boost converters, with a simple circuit structure and control schemes, cannot realize the high voltage gains that are required in modern renewable energy sector . In order to achieve a high voltage gain, various high step‐up converters on a single‐stage basis have been proposed and applied in wide‐ranging applications to realize desired voltage gains, such as clamped‐inductor, switched‐capacitor, impedance network, switched‐inductor, voltage multiplier, and magnetic coupling …”

“…High step-up converters have been playing an indispensable role in modern renewable energy-integrated power grid, but traditional boost converters, with a simple circuit structure and control schemes, cannot realize the high voltage gains that are required in modern renewable energy sector. [1][2][3][4][5][6] In order to achieve a high voltage gain, various high step-up converters on a single-stage basis have been proposed and applied in wide-ranging applications to realize desired voltage gains, such as clamped-inductor, 7,8 switched-capacitor, 9,10 impedance network, [11][12][13] switched-inductor, [14][15][16] voltage multiplier, 17,18 and magnetic coupling. 19,20 However, single-stage converters can no longer satisfy high-voltage gain requirements in current power system applications, and a common method to overcome this limitation is to implement various voltage-pumping techniques into a number of identical or different converter modules.…”