System and method for improving power factor of uninterrupted power supply by energy storage off-grid inverter

Abstract

The invention relates to the field of power supply network, and particularly relates to a power supply network uninterrupted power supply system and method. The system comprises a first power supply branch and a second power supply branch. The first power supply branch comprises a commercial power supply unit which can be controlled to supply power to a load. The second power supply branch and the first power supply branch are connected in parallel at the two ends of the load. An inverter unit is connected on the second power supply branch. The inverter unit supplies power to the load. When the inverter unit works in the first working state, the inverter unit independently outputs constant voltage and frequency to the load; and when the inverter unit works in the second working state, the inverter unit adjusts the power factor of the first power supply branch by controlling the output voltage of the inverter unit and the phase angle between the output voltage of the inverter unit and the output voltage of the commercial power supply unit. When commercial power is normal, the inverter enhances the power factor of a power grid by controlling its output voltage and the phase angle between its output voltage and commercial power. When commercial power is abnormal, the energy storage off-grid inverter independently supplies power to the load so that the power supply reliability of the load is enhanced.

Description

technical field [0001] The invention relates to the field of power supply network, in particular to an uninterrupted power supply method and system for the power supply network. Background technique [0002] At present, the combination of large power grid and distributed power generation is recognized by many energy and power experts in the world as the main method that can save investment, reduce energy consumption, and improve the security and flexibility of the power grid. It is the development direction of the power industry in the 21st century. In distributed power generation, the renewable energy wind energy and solar energy are inexhaustible as clean energy, but due to the influence of changes in weather conditions, their output power has random fluctuations, intermittent, and instability. With its large-scale integration into the power grid, it brings great challenges to the production and operation of the power system. [0003] Based on distributed power generation...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a system and control method for improving the power factor of uninterrupted power supply by an energy storage off-grid inverter, so as to solve the technical problem that the power supply unit in the prior art is unstable in supplying power to the load, and to provide a mode to improve the power factor of the load

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