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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...
A photovoltaic (PV) grid-connected power conditioning system with the function of uninterruptible power supply (UPS) is presented in the paper. It can not only realize photovoltaic generation, but also has full function of shunt active power filter (APF). In addition, it can act as UPS when instantly power interruption occurs. The instantaneous reactive power theory is employed in harmonics current...
This paper presents a single-phase photovoltaic power conditioning system (PVPC) based on a Z-source impedance network instead of a conventional boost converter. Using Z-source networks, the system can work within a wider range of PV array output voltages than for a conventional boost converter. Single phase instantaneous reactive power theory is adopted for harmonics current detection and a synthesis...
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...
With the widespread use of large-capacity power electronic devices, there are too much harmonic current and harmonic voltage in power system at the same time. The active power filter (APF) or hybrid active power filter (HAPF) can only eliminate harmonic current or harmonic voltage, and possibility resonance. To eliminate harmonic current and harmonic voltage in power system simultaneously and enhance...
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...
This paper presents a control system that combines photovoltaic (PV) grid-connected generation and power quality managements. With the proposed structure, the system can not only realize photovoltaic generation, but also suppress current harmonics, compensate reactive power, eliminate voltage sags or swells and mitigate instantly power interruption and other power quality problems. An adaptive predictive...
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