Comprehensive control method for micro-grid power fluctuation stabilization and electric energy quality treatment based on energy storage converter

Abstract

The invention discloses a comprehensive control method for power fluctuation stabilization and electric energy quality treatment of a micro-grid based on an energy storage converter, and the method comprises the steps: firstly, calculating the power of a grid-connected point based on an instantaneous power theory according to two output modes of power fluctuation stabilization and electric energy quality treatment of the energy storage converter; a main and auxiliary mode switching control strategy of the energy storage converter is determined by comparing the power required by the local load and the energy storage residual power; in order to prolong the service life of the energy storage system, an energy storage capacity distribution strategy based on reactive power / harmonic wave / three-phase imbalance priority is also provided, compensation priorities are set for three electric energy quality problems existing in the micro-grid, and the electric energy quality problem with a higher compensation level is preferentially compensated according to the residual capacity of the energy storage system. According to the invention, an energy storage converter main and auxiliary mode switching control strategy and a reactive / harmonic / three-phase unbalanced priority energy storage capacity distribution strategy are effectively combined, the problems of grid connection and electric energy quality of a micro-grid are greatly improved, and the operation economy of an energy storage battery is improved.

Description

technical field [0001] The invention relates to the technical field of power quality management of microgrids, in particular to a comprehensive control method for power fluctuation stabilization and power quality management of microgrids based on energy storage converters. Background technique [0002] With the large-scale integration of clean energy power generation represented by wind energy and solar energy, the safe operation of the power system is severely threatened. With a large number of non-linear loads used, the power quality problems such as harmonics, reactive power, and three-phase unbalance in the power grid are more serious, which brings serious challenges to the security and stability of the power system. Traditional power management methods include on-load voltage regulating transformers, shunt capacitor banks, RLC passive filters, etc. This type of equipment has simple principles and low construction and maintenance costs, but there are many deficiencies in...

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Problems solved by technology

The main and auxiliary mode switching control strategy of the energy storage converter proposed by the present invention, as well as the energy storage capacity allocation strategy of reactive power / harmonic / three-phase unbalance priority, greatly improve the power fluctuation stability during the grid-connected operation of the microgrid Problems related to power quality management, improving the economical operation of energy storage batteries

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