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This paper discusses three types of current controllers with an active damped inductor-capacitor-inductor (LCL) filter for grid connected solar photovoltaic (PV) system. Grid current is considered as the feedback variable in the first controller. The filter capacitor is divided into two parts and the current between the split capacitor is considered in the feedback to actively damp the resonance peak...
This paper proposes a space vector modulation based dc-link capacitor voltage balancing technique for a five-level multiple-pole multilevel diode-clamped (M2DCI) inverter. The new five-level inverter contains lesser number of clamping diodes compared to the conventional five-level diode-clamped inverter (DCI) topology and does not require any extra balancing circuits to maintain balanced voltages...
This paper proposes a power balancing strategy for dispatchable and non-dispatchable sources in an islanded microgrid. This control method enables energy storage system that employs a voltage-band at a dc busbar to maintain grid voltage stability for short period disturbances in a network. This voltage-band, applied to obtain maximum benefit from the storage system, depends on a storage capacity feature...
As a response to economic growth, electric power utilities installed many electric power facilities to meet power demand. However, these facilities have aged and should be replaced in the near future. Moreover, after the Great East Japan Earthquake, significant power flow changes in power system would likely to happen. Therefore, for electric power facilities planning, it is necessary to solve such...
DC distribution network will be widely used in the future with more integration of distributed generation. However, development of DC distribution is hindered by lack of appropriate circuit protection technologies. Certain protection schemes are studied in this paper, and used to detect and isolate the fault on the distribution lines and bus-tie line. The instantaneous overcurrent protection and the...
The grid connected PV system is having dedicated controller for dc link voltage control with control algorithm for generation of reference quantity. The degree of freedom in the system with PI control scheme is having one degree of freedom (DOF). The normal PI controller (1-DOF PI) deals with the limitation of having single proportional and integral gains that may results in poor response time and...
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