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Connected to high-voltage power system directly, electrified railway is a particular user to power system, and its loads have the characteristics such as non-liner, asymmetry and volatility and so on. Researched on Chunshen traction substation which belongs to Shanghai-Hangzhou electrified railway, and accorded to the requirements and characteristics of comprehensive management to harmonics, reactive...
Nowadays, photovoltaic power systems are widely accepted due to the worldwide energy shortage. To attain near sinusoidal outputs of the grid-connected photovoltaic system, improve the power quality, and decrease the energy loss, this work presents a novel photovoltaic grid-connected power conditioner (PVPC) system based on a hybrid multilevel inverter. In the proposed structure, each phase of the...
This paper describes a grid-connected photovoltaic (PV) system with the function of active power filter (APF), in which a Z-source network is employed to boost the DC bus voltage during periods when the PV array output is low. After modeling the Z-source network and H-bridge converter, a state space model of Z-source inverter is derived. The model reflects the fact that the Z-source inverter has two...
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