Enhancing Flexibility of an Islanded Microgrid With Electric Springs
IEEE TRANSACTIONS ON SMART GRID
Authors: Liang, Liang; Hou, Yunhe; Hill, David J.
Abstract
An electric spring (ES) is effective in enhancing the operational flexibility and facilitating renewable energy integration. An ES can determine the operation status of the connected noncritical loads (NCLs) by adjusting its output voltage. It is possible to use NCLs as operation resources for renewable integration. In this paper, a model predictive control (MPC)-based strategy is proposed to dispatch ESs with a water heating system (WHS) used as an NCL in an islanded microgrid to accommodate fluctuating renewables. Critical loads (CLs) in the microgrid can also benefit from ESs by obtaining a reliable supply voltage with smaller deviations than other loads. The CL is modeled using a ZIP static load model, which is commonly used to represent loads of a power system. The temperature constraint of the WHS and the ramping constraint of a diesel generator are considered and can be effectively managed by the proposed MPC strategy. Finally, the capabilities of NCLs with ESs to enhance operational flexibility are studied through sensitivity analyses with different ramping abilities of the microgrid.
Combined Anti-inflammatory and Neuroprotective Treatments Have the Potential to Impact Disease Phenotypes in Cln3(-/-) Mice
FRONTIERS IN NEUROLOGY
Authors: Tarczyluk-Wells, Marta A.; Salzlechner, Christoph; Najafi, Allison R.; Lim, Ming J.; Smith, David; Platt, Frances M.; Williams, Brenda P.; Cooper, Jonathan D.
Abstract
Batten disease, or juvenile NCL, is a fatal neurodegenerative disorder that occurs due to mutations in the CLN3 gene. Because the function of CLN3 remains unclear, experimental therapies for JNCL have largely concentrated upon the targeting of downstream pathomechanisms. Neuron loss is preceded by localized glial activation, and in this proof-of-concept study we have investigated whether targeting this innate immune response with ibuprofen in combination with the neuroprotective agent lamotrigine improves the previously documented beneficial effects of immunosuppressants alone. Drugs were administered daily to symptomatic Cln3(-/-) mice over a 3 month period, starting at 6 months of age, and their impact was assessed using both behavioral and neuropathological outcome measures. During the treatment period, the combination of ibuprofen and lamotrigine significantly improved the performance of Cln3(-/-) mice on the vertical pole test, slowing the disease-associated decline, but had less of an impact upon their rotarod performance. There were also moderate and regionally dependent effects upon astrocyte activation that were most pronounced for ibuprofen alone, but there was no overt effect upon microglial activation. Administering such treatments for longer periods will enable testing for any impact upon the neuron loss that occurs later in disease progression. Given the partial efficacy of these treatments, it will be important to test further drugs of this type in order to find more effective combinations.