APFs and SVCs combined power quality control method based on micro-power grid energy storage system

Abstract

The invention relates to an APFs and SVCs combined power quality control method based on a micro-power grid energy storage system. A micro-power grid busbar is connected with an energy storage system,loads, SVCs and a distributed power supply device; the energy storage system is composed of a PCS and an energy storage battery, and the energy storage battery achieves energy exchange with the micro-power grid through the PCS and outputs a proper amount of active power and reactive power to ensure the power balance of the micro-power grid from the system level, so that the system voltage and frequency are maintained relatively stable; the PCS is connected to the micro-power grid busbar; the loads include the linear load and the non-linear load, and both loads are connected to two branches through the corresponding SVCs respectively; the distributed power supply device includes a solar photovoltaic plate and a wind power generation device, and the solar photovoltaic plate and the wind power generation device are connected to two branches through corresponding parallel-type APFs respectively. Through overall coordinated use of the energy storage system, the APFs and the SVCs, the battery energy storage system not only can effectively maintain the power balance of the micro-power grid, but also can improve the power quality of the micro-power grid, and the stable operation of the system in various states is achieved.

Description

technical field [0001] The invention belongs to the field of power system distributed generation microgrid and microgrid power quality control, and in particular relates to the realization of power quality control based on the combination of APF and SVC of a microgrid energy storage system. Background technique [0002] Microgrid is a distributed micro-grid technology based on renewable energy, which has attracted more and more attention in recent years. Distributed renewable clean energy power generation often needs to go through power conversion modules to connect to the large power grid, and power conversion usually needs to consume reactive power, and they will also generate uncertain harmonics, similar to loads such as electric vehicle charging devices; other Factors include the nonlinearity and asymmetry of the load, the intermittence and instability of the micro-source, etc.; in summary, the micro-grid faces various power quality problems such as current harmonics, po...

AI Technical Summary

Problems solved by technology

If you only rely on the energy storage system, you can't achieve a good power management effect, and you can't give full play to the energy storage system's comprehensive functions of charging and discharging, peak shaving and valley filling, peak shaving and frequency modulation, power balance and improving power quality.

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