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Multilevel converters, which are supplied by cascaded capacitors and non-isolated DC sources, can not operate without capacitor voltage balancing. This paper proposes a capacitor voltage balancing technique for the dual three-level T-type advanced converter topology. The reason behind the capacitor voltage unbalance, of this topology, is discussed and clarified by using the converter power circuit...
This paper studies the performance of the dual 3-level T-type converter topology, as an advanced 5-level converter, applied to an open-ends induction machine. The performance is evaluated based on harmonic analysis, converter power loss and the steady-state machine performance. An advanced technique based on space-vector pulse-width modulation is proposed to reduce the converter switching stress as...
A new compact UWB BPF filter with embedded reconfigurable multiband frequency notch function is presented. The proposed filter consists of compact 2U-shaped DGS resonators shunt connected to the parallel coupled lines. Frequency notch is achieved by using 2U-DGS. To tune the notched band, suitable capacitors within the inner U-DGS and RF PIN diodes within the outer U-DGS are integrated. A curve fitting...
This paper presents an investigation on the various faults that a bi-directional AC-DC/DC-AC converter linking a DC microgrid to the main AC grid may encounter. In addition, the protection of this converter against line-line, line-ground, one phase open and DC bus faults is developed, presented and discussed. The converter proved to be a very effective tool to transfer any desired amount of power...
This paper proposes an algorithm based on the use of the S-transform for time-frequency analysis of the capacitor-switching transients. With no prior knowledge about system parameters, the time-frequency analysis of the voltage and current transient signals due to switched capacitor banks are used to simply but accurately estimate the relative location of the switched capacitor whether it is upstream...
In this paper, some of the aspects related to the design and implementation of grid connected DC microgrids are investigated. A prototype system has been designed and implemented to address these aspects. The described system is dependent mainly on sustainable energy sources. Hence, a special care has been given to dealing with these kinds of sources while designing different components of the system...
In this paper, a detailed description of a proposed technique for power flow control in DC distribution systems has been presented. The DC system under study is assumed mainly dependent on renewable energy sources. The proposed topology utilizes a controlled series current compensator (CSCC) technique for connection and power flow control among buses. The proposed topology allows full power flow control...
Proportional integral derivative (PID) controllers are usually used to control DC-DC boost converters in PV systems. However, they have to be tuned based on certain defined operating range using averaged mathematical models. Loading conditions have great effect on PI controllers; PI controllers are subjected to failure under dramatic load changes. This limits the PI controller's operating range. Moreover,...
This paper presents a detailed description of a proposed topology for connecting DC buses in a DC distribution system. The power available at the DC system under study is assumed mainly dependent on renewable energy sources. The proposed topology utilizes a controlled series current compensator (CSCC) technique for power flow control. The proposed topology has certain features like full power flow...
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