An energy-based control for an n-H-bridges multilevel active rectifier

Dept. of Electr. & Electron. Eng., Politecnico di Bari, Italy
IEEE Transactions on Industrial Electronics (Impact Factor: 6.5). 07/2005; 52(3):670 - 678. DOI: 10.1109/TIE.2005.843971
Source: IEEE Xplore

ABSTRACT This paper deals with the control of a multilevel n-H-bridges front-end rectifier. This topology allows n distinct dc buses to be fed by the same ac source offering a high loading flexibility suitable for traction applications as well as for industrial automation plants. However, this flexibility can lead the system to instability if the dc buses operate at different voltage levels and with unbalanced loads. Thus, linear controllers, designed on the basis of the small-signal linearization, are not effective any longer and stability can not be ensured as large-signal disturbances occur. The use of a passivity-based control (PBC) designed via energy considerations and without small-signal linearization properly fits stability problems related to this type of converter. The system has been split into n subsystems via energy considerations in order to achieve the separate control of each dc bus and its stability in case of load changes or disturbances generated by other buses. Then, a set of n passivity-based controllers (one for each subsystem) is adopted: the controllers are linked using dynamical parameters computed through energy balance equations. Hence, the system dc buses are independent and stable as experimental results demonstrate.

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    • "Then, the respective equations are properly incorporated in the general control algorithm through the state space equations. In [4], a very efficient way for the comprehension of the system power flow was proposed and analyzed. This specific approach is adopted for the scopes of the present work as well. "
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    Energy Conversion Congress and Exposition (ECCE), 2011 IEEE; 10/2011
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    • "In this paper, it is proposing employ Zigbee transmit and receive data between computer and microcontrollers. Figure 1 shown that four independent Zigbee trans receiver star network, which is used to control the direction and speed of two DC motors through Dual H-Bridge converter[2][3], Illumination control through TRIAC[4] and closed loop water path temperature control[5]. One Zigbee is connected to personal computer which is used to receive and transmit data from the remaining three Zigbees. "
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    • "The system parameters and variables are described in Table I, where the continuous control signals δ 1 and δ 2 , represent the switching functions. The equations that describe the 2C-CHB behavior are well known and they have been reported previously [23]. "
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