‘An Energy-Based Control for an n-H-Bridges Multilevel Active Rectifier’
Dept. of Electr. & Electron. Eng., Politecnico di Bari, ItalyIEEE Transactions on Industrial Electronics (Impact Factor: 6.5). 07/2005; 52(3):670 - 678. DOI: 10.1109/TIE.2005.843971
Source: IEEE Xplore
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.
[Show abstract] [Hide abstract]
- "This is done by a respective adaptation of the modulation reference for each submodule. A power ratio factor β kj i is therefore introduced  "
ABSTRACT: Multilevel Converters and battery energy storage systems (BESS) are key components in present and future medium voltage networks, where an important integration of renewable energy sources takes place. The Modular Multilevel Converter (MMC) offers the capability of embedding such energy storage elements in a split manner, given the existence of several sub-modules operating at significantly lower voltages. This paper analyzes such a converter structure under different operating modes. In order to eliminate the low frequency components of the sub-module output currents, the latter are interfaced to the batteries by means of non-isolated DC/DC converters. Control algorithms are developed for the balancing of the battery State of Charges and the respective gain limitations are established. Unbalanced grid conditions are also taken into account through the theory of symmetrical components and solutions are proposed. Finally, the development of a down-scaled prototype is described and experimental results are presented.IEEE Transactions on Power Electronics 01/2015; 30(1):163-175. DOI:10.1109/TPEL.2014.2303297 · 6.01 Impact Factor
[Show abstract] [Hide abstract]
- "Then, the respective equations are properly incorporated in the general control algorithm through the state space equations. In , 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. "
ABSTRACT: The cascaded H-Bridge multilevel active rectifier is an emerging converter topology, which offers significant advantages, such as modularity and high flexibility for a wide range of applications, including traction systems, industrial automation plants, uninterruptable power supplies, and battery chargers. However, the need for stable operation of the H-Bridge cells at asymmetrical voltage potentials and unbalanced loads imposes demanding requirements, in terms of an advanced and accurate control strategy. This paper introduces a simple and powerful solution to the mentioned problems, based on constrained Model Predictive Control (MPC). The proposed nonlinear controller achieves low input current harmonic distortion with almost unity power factor, as well as independent regulation of the H-Bridge cells, both under steady state and transient conditions. The effectiveness of the novel control algorithm is demonstrated by means of simulations as well as preliminary experimentation on a single-phase laboratory setup.Energy Conversion Congress and Exposition (ECCE), 2011 IEEE; 10/2011
[Show abstract] [Hide abstract]
- "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, Illumination control through TRIAC and closed loop water path temperature control. One Zigbee is connected to personal computer which is used to receive and transmit data from the remaining three Zigbees. "
ABSTRACT: Wireless based industrial automation is a prime concern in our day-to-day life. The approach to Zigbee Based Wireless Network for Industrial Applications standardized nowadays. In this paper, we have tried to increase these standards by combining new design techniques to wireless industrial automation. The personal computer based wireless network for industrial application using Zigbee can be adopted at micro and macro Industries, it has various types of Processors and Microcontrollers. Here Microcontrollers, Temperature Sensors, Zero crossing detector, Voltage regulators are used. The system is fully controlled by the Personal Computer through Visual Basics GUI (Graphical User Interface).The GUI is developed based on application by the user. All the processor and controllers are interconnected to personal computer through Zigbee. The Personal Computer will continuously monitor all the Data from remote processing unit and compare with value preloaded process structure. If any error is found the personal computer takes necessary action. Here star topology four node Zigbee network is tried. The first Zigbee is connected to the personal computer it acts as full function devices and is used to send and receive data from other nodes. The second, third and fourth Zigbee are reduced function devices and they are used to control the speed of DC motor, temperature control and lamp illumination control respectively. All the Zigbee's are interconnected with processing unit through RS232 protocol.
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.