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This paper analyzes the active power in modular multilevel converters (MMCs), and presents a novel comprehensive control scheme of low frequency operation for the arm capacitor voltages and high frequency circulating current. The inner loop of this scheme employs the arm current direct control which can control the ac side currents, dc-link current and circulating currents simultaneously; an improved...
PWM converters have been widely applied for power processing and they are typically the stems of other types of converters, such as quasi-resonant and multi-resonant converters. Development of the PWM converters has been spanning over a century, starting from the buck converter. The well known PWM converters include buck, boost, buck-boost, Ćuk, SEPIC, Zeta, Z-source, quasi-Z source, etc. Many attempts...
The operating characteristics of photovoltaic (PV) cells are essential to the design of steady-state characteristics and control parameters of the interface converter in output voltage regulation (OVR) mode. From the perspective of output voltage closed-loop control stability, the effect of control loops form of the interface converter in OVR mode on the operating characteristics of PV cells is studied...
This paper aims to analyze the applied hybrid controlled three-phase grid-connected inverter for marine current power generation system used in distributed generation. As inverter is a key part of the grid-based system, grid-connected technology plays an important role in the distributed generation to meet the stricter grid interconnection standards. In order to improve the power quality and strengthen...
The resonance characteristics of ultrasonic transducer are analyzed based on the equivalent circuit of transducer and the quantitative calculation of admittance circle, and a control method of frequency tracking based on variable step length is proposed, and the limits of step switching are deduced, and the control parameters of the control method based on variable step length is designed in this...
This paper proposes a method for independent drive of two permanent magnet synchronous motors (PMSMs) fed by a single five-leg inverter (5LI) based on reducing peak current of common leg. The advantages of 5LI are reduced size, volume, reduced number of devices, and increased efficiency due to total lower losses. The conventional method that has been used for controlling two PMSMs sends a large amount...
This paper proposes a new interleaved flyback topology based on hysteretic control. The output current ripple can be reduced with the interleaved structure, and both switches can achieve Zero-voltage-switching (ZVS). Besides, the energy of leakage inductance can be fully recycled, which will improve the efficiency of the converter. The topology is based on hysteresis control, with this control scheme,...
A new hysteretic control strategy with output capacitor equivalent series resistance (ESR) ripple compensation is presented. With such compensation, the effect of output capacitor ESR ripple voltage is enhanced. When step load change occurs, feedback of the output ripple adjusts the duty ratio promptly. In result, the proposed control scheme gains faster transient response speed and better steady...
In order to solve the design problem of coupled inductor in multiphase interleaving bidirectional DC/DC convertor, the universal design criterion of coupled inductor with general applicability was proposed. The Buck+Boost interleaving and magnetically integrated bidirectional DC/DC converter was studied under Buck mode with all inductors coupled symmetrically. The universal design criterion of coupled...
For a constant on time controller to be stable with all ceramic output capacitance, a virtual ESR (Equivalent Series Resistance) circuit is needed to inject the required ripple voltage into the FB (Feedback) node. This paper proposes a new stability criterion, which is that the FB node ripple voltage need to have the same phase as the inductor current and have certain amplitude to filter out noise...
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