Multifunctional Power Quality Controller and Power Quality Control Method

Abstract

The invention discloses a multifunctional electric energy quality controller and an electric energy quality control method in which the controller is used. The electric energy quality controller comprises a fundamental wave current detection unit, a control unit and a serial transformer unit, fundamental wave current signals at the primary side of the transformer serve as reference signals, current signals at the secondary side of the transformer serve as feedback signals, a current source is generated via a closed loop control, and he current source is applied to the secondary side of the serial transformer unit. The controller and method can realize functions including harmonic wave isolation, tidal current adjustment, overvoltage and overcurrent limitation, soft starting and reactive compensation.

Description

technical field [0001] The invention belongs to the field of electric power technology, and in particular relates to a multifunctional power quality controller and a power quality control method that can be used in a microgrid. Background technique [0002] The dual pressure of environmental protection and energy shortage has promoted the construction of smart grid with low-carbon green energy as the core. Distributed power generation is the only way to solve future energy demand, and micro-grid is the seamless connection of distributed power generation to large power grid. It is also an important basis for building a smart grid. The flexible operation mode of the microgrid can improve the reliability of power supply for users and the utilization rate of distributed energy, reduce the impact on the large power grid, and have good economic and social benefits. Due to the diversity of microgrids in terms of power sources, loads, energy conversion units, energy storage, and op...

AI Technical Summary

Problems solved by technology

[0006] 3) Overvoltage and overcurrent phenomena are more frequent. The capacity of the microgrid is generally not large. The impact of load fluctuations in the microgrid on the output of the micropower supply is greater than that of the traditional grid. The operating status of multiple converters in the microgrid is variable after they are connected in parallel. , Overvoltage or overcurrent is prone to occur during the rapid switching of control modes

[0007] 4) A variety of power quality problems coexist. After the parallel connection of various converters connected to the microgrid, various power quality problems overlap and stimulate each other, which may cause a chain reaction, further deteriorating the power quality of the microgrid, and threatening the microgrid and the large power grid. The safe and stable operation of the micro-grid will burn down the power generation and electrical equipment of the micro-grid, causing the power supply interruption of the micro-grid and the large power grid

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