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Dynamic Modeling of PWM Plus Phase-Shift (PPS) Bidirectional DC-DC Converters

Author: SunLiPing
Tutor: XuDeHong；ChenMin
School: Zhejiang University
Course: Power Electronics and Power Drives
Keywords: PWM technology Phase shift control technology PWM plus phase shift (PPS) control technology Bi - directional DC-DC converter Dynamic Modeling
CLC: TM46
Type: Master's thesis
Year: 2006
Downloads: 436
Quote: 3
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Abstract


With the development of science and technology , bi-directional DC-DC converter is widely used the occasion of the DC power supply (UPS) systems , aerospace, power systems , electric vehicles , and mobile power generation system . PWM plus phase shift (PPS) control technology PWM technology with phase shift control technology combined with technology . Adjust the PWM duty cycle of the device , the equivalent of an electronic transformer in the circuit , so that the positive and negative voltage amplitude of the input square wave power and output square wave power match . Compared with the conventional phase shift control , the PWM plus phase shift (PPS) control mode of the current stress of the converter can be reduced , reducing the on-state losses , also can broaden the scope of the zero-voltage switching , so that the converter in a wide load variations can achieve soft switching. Typically, the converter needs plus negative feedback to form a closed loop system , in order to improve the accuracy and dynamic characteristics of the converter output , and therefore need to analyze the dynamic performance of the converter . Nowadays, the modeling method for bi-directional DC-DC converter is mainly state-space averaging method , and are modeling a system of adjustable parameters . PWM plus phase shift (PPS) control of the bi - directional DC-DC converter , there are two adjustable parameters - the duty ratio D , and the phase shift angle φ . Improvements on the basis of previous modeling study to create a small signal dynamic model having two adjustable parameters , the PWM plus the phase shift (PPS) the control of the bidirectional DC-DC converter , in order to power system analysis and an inverter controller design . To a PWM plus phase shift (PPS) to control the bi-directional DC-DC converter circuit , for example, dynamic modeling and analysis , simulation and experimental verification of the correctness of the dynamic model .

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter
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