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Operation and Control-Oriented Modeling of a Power Converter for Current Balancing and Stability Improvement of DC Active Distribution Networks

Operation and Control-Oriented Modeling of a Power Converter for Current Balancing and Stability Improvement of DC Active Distribution Networks,10.110

Operation and Control-Oriented Modeling of a Power Converter for Current Balancing and Stability Improvement of DC Active Distribution Networks   (Citations: 2)
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Future active distribution networks appear as a so- lution to the energy distribution challenges. In this context, dc systems show potential for reducing losses and electronic equip- ment costs. Power electronics is the main enabler to this initiative and strong research efforts are ongoing in order to find solutions and evaluate the benefits and requirements for the power convert- ers to be applied in dc systems. There is evidence that bipolar dc networks are advantageous due to higher reliability and increased power transmission capability. In such a network, currents are typically unbalanced and, thus, increase feeder losses. Another challenge in dc active distribution networks is the overall voltage stability due to the presence of distributed energy resources and loads with their power electronics interfaces. This study proposes a power converter and its control principles, which is able to bal- ance the currents in a bipolar dc network and improve its stability. Its operation principles, control-oriented modeling, and laboratory implementation are presented and verified through experiments.
Journal: IEEE Transactions on Power Electronics - IEEE TRANS POWER ELECT , vol. 26, no. 3, pp. 877-885, 2011
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    • ...The loads/sources might present unbalanced powers and, thus, voltage balancers [6], [9] and/or current redistributors [10] can be employed to balance the supply line currents and/or voltages, consequently reducing transmission losses...
    • ...Fig. 2. Dc-dc converter topologies considered for the evaluation: (a) voltage balancer type 1 (VB–1) [6], [9]; (b) voltage balancer type 2 (VB–2); (c) current redistributor type 1 (CR–1) [10]; and, (d) current redistributor type 2 (CR–2)...
    • ...Assuming unbalanced powers due to arbitrary upper and lower dc-side loads and sources, current redistributors can be advantageously employed for minimizing transmission losses in long bipolar dc lines [10]...
    • ...Fig. 2(c) [10]) is able to perform several functions in the system, namely: (i) current redistribution; (ii) active damping of common (CM) and differential (DM) mode line resonances; (iii) inclusion of dc energy storage (batteries, super-capacitors) at its dc-link; and, (iv) operation with loss of one dc line...
    • ...Furthermore, it can be connected to a storage device in its dclink increasing energy availability and provide active damping for both common and differential equivalent circuits [10]...

    Jackson Lagoet al. Evaluation of power converters to implement bipolar DC active distribu...

    • ...Power Filter (DC APF) as presented in other literatures [8, 9], except that the DC APF is single phase and thus can only be used to eliminate harmonics of the DC bus...

    Sanzhong Baiet al. Design considerations for DC charging station for plug-in vehicles

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