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As a significant part of electrical load, air conditioners draw attentions for their sometimes-unfriendly load characteristics, especially their dynamic responses during grid voltage disturbances. In this paper, a novel under-voltage control strategy for variable-speed air conditioners is introduced, which can keep air conditioners load characteristic as constant impedances when unexpected voltage...
Multifunctional grid-tied inverters (MFGTIs) have been paid much attention to handle the commonly concerned power quality issues of the microgrids. An MFGTI can not only interface the renewable energy resource into the utility grid, but also can compensate the harmonic and reactive current in the microgrid as an auxiliary service. However, the apparent capacity of an MFGTI for power quality compensation...
There are lots of power electronic converters, nonlinear loads, and reactive loads in a micro-grid, which may worsen the power quality and affect the stability, efficiency, as well as economical operation of the micro-grid significantly. A novel approach is presented to share the harmonic and reactive currents of a micro-grid using scattered multi-functional grid-connected inverters (MFGCI) without...
A novel multi-functional grid-connected inverter (MFGCI) is presented in this paper, which can enhance power quality at the point of common coupling (PCC), compensating the unbalanced, harmonic and reactive current simultaneously. To achieve comprehensive compensation, comprehensive indicators of power quality are proposed and a multi-objective optimal mathematical model is built with some constraints...
The battery energy storage system is utilized for shifting system loads from daily peaks to daily lows. More interests has been renewed to furthering the function of the BESS as a tool to enhance power system stability, aid power transfer, improve reliability and power quality. This paper investigates the influence on transfer capability, small signal stability and steady state stability boundary...
A power conditioning system combing with photovoltaic array, sodium-sulfur battery and flywheel energy storage system is presented, which is used to improve the power quality of the low-voltage gird in China. All the three energy sources are connected to the common DC bus by different power electronics interfaces. The functions and specifications of the system are studied, and then the selections...
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