Energy storage bidirectional converter system for harmonic compensation and control method

Abstract

The invention relates to an energy storage bidirectional converter system for harmonic compensation and a control method, and belongs to the technical field of harmonics reduction. The invention solves the problem of excessive nonlinear load harmonic current by utilizing the existing energy storage bidirectional converter in the micro grid, and optimizes the power quality of the micro grid. The invention eliminates the influence of the long distance feeding line and improves the harmonic compensation effect by directly collecting the nonlinear load side harmonic information. A voltage and current model is established; the harmonic current characteristic value and the PCC point characteristic emitted by the nonlinear load are extracted by a signal measurement coding device; the communication information amount is compressed, and the harmonic information is transmitted through a narrowband wireless communication device; and a local controller receives the information of the signal measurement coding device and then decodes the information, so as to restore the real load harmonic current, thereby realizing the closed-loop proportional resonance control of the energy storage bidirectional converter, and realizing the accurate compensation of the harmonic current of any number of times. The invention has the advantages of low cost, excellent effect and simple engineering realization.

Description

technical field [0001] The invention relates to an energy storage bidirectional converter system and a control method for harmonic compensation, and belongs to the technical field of harmonic reduction. Background technique [0002] The increasingly serious problems of environmental pollution and energy crisis have prompted the proportion of distributed new energy power generation in my country's power generation energy structure to increase year by year. However, the distributed new energy power generation system is easy to fluctuate with the environment and unpredictable. impact on reliability and power quality. As an energy storage medium, the battery energy storage system has two-way power capability and flexible adjustment characteristics, which can effectively improve the negative impact of the power fluctuation and intermittency of renewable energy generation on the power grid, and improve the acceptance of distributed new energy by the power grid. ability, so it has ...

AI Technical Summary

Problems solved by technology

But the disadvantage is that due to the limitation of installation and use site, nonlinear loads are generally installed far away from the energy storage bidirectional converter, and the harmonic characteristics collected through the feeder line are relatively different from the real harmonic characteristics of the nonlinear load. Large variation, resulting in failure of harmonic compensation

However, if the traditional long-distance communication has a huge amount of harmonic information, the communication cost and control requirements will be greatly increased, which is not conducive to engineering applications.

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