one of the main disadvantages of anaerobic wastewater treatment at a low ph is the significantoperational cost due to the addition of necessary alkali. to reduce alkali supplement and thus the cost, thisstudy proposes a sequential multi-feed (sqmf) mode (distributed feeding) and effluent recycle (er) mode.experiments were conducted with a pilot-scale (2.5 m3) thermophilic (55°c) multi-staged up...

one of the main disadvantages of anaerobic wastewater treatment at a low ph is the significantoperational cost due to the addition of necessary alkali. to reduce alkali supplement and thus the cost, thisstudy proposes a sequential multi-feed (sqmf) mode (distributed feeding) and effluent recycle (er) mode.experiments were conducted with a pilot-scale (2.5 m3) thermophilic (55°c) multi-staged up...

In this paper in order to ensure that protection of the system remains reliable even after introduction of DG is studied key Protection Challenges of the DN with DG and established rules for the design and coordination of protective relays in a power system. Such as Differential Protection Schemes, A Balanced Combination of Different Types of DG Units for Grid Connection, Inverter Controller De...

modeling and simulation of flywheel energy storage system as v/f reference in islanded microgrid

With growing environmental concerns, the installation of distributed generation systems forming microgrids in power has received much attention recently. This panacea, however, always some challenges with itself. The delay digital control systems, grid impedance variations weak grids, and interaction between paralleled converters a microgrid, which can threaten expectable operation microgrids, ...

Microintegrated energy systems (MIESs) can be disconnected from power distribution during system faults. This paper develops a control scheme for an islanded MIES. The VSC inverter controls the AC bus voltage and frequency using modified regulator regulator. structures of power-to-gas PMSG-based microturbine generator (MTG) are improved. Renewable generation always runs at maximum point. surplu...

The resilient operation of microgrids (MGs) relies strongly on their ability to operate in islanded mode, autonomously from the bulk grid, whilst adhering secure requirements. Catastrophic events transmission grid can lead abrupt MG islanding accommodated by large frequency and voltage excursions due power imbalances within MG. It is vital that scheduling algorithms incorporate both static tran...

The microgrid has been defined to cope with the large penetration of distributed generations (DGs). is capable operating in grid-connected mode (GC) and islanded (IS). In microgrid, (DGs) are always connected power network via inverters. Grid Connected mode, DGs commonly acts as current controlled sources retain a high grid-current quality fast dynamic response photovoltaic wind generation syst...

Islanded microgrids have low inertia due to a large penetration of non-inertial inverter based power sources. In such systems, the primary frequency controller (PFC) faces issue higher rate change (RoCoF) and peak deviation in case sudden load or generation loss. The control becomes more challenging as variation different sources is not synchronized. This paper proposes model for dynamics an is...