The low-frequency oscillation (LFO) threatens the safe and stable operation of the railway electrification train-grid (RETG) system, and high-performance stability enhancement methods are desirable.

Relying only on the stand-alone solar photovoltaic system for street lighting faces several barriers. The most important of them is the installation expensive cost, the low autonomy of batteries, and ...

America’s most expensive mansions aren’t just in Beverly Hills and Miami this year’s record-breaking sales are rewriting the ...