Light-storage-type charging station quasi-proportional-resonant (PR) droop control method based on SOC (State of Charge)

Abstract

A light-storage-type charging station quasi-proportional-resonant (PR) droop control method based on an SOC (State of Charge) relates to the technical field of micro power grids and aims to solve a technical problem of regulation control of an alternating inverter. The method is characterized in that a quasi-PR droop control formula is used to calculate a phase angle offset and a voltage offset of the alternating current side of the alternating current inverter, and the phase angle offset and the voltage offset of the alternating current side of the alternating current inverter are added to a rated voltage and a rated phase angle of the alternating current side respectively through an auto-PI link, so that a three-phase voltage reference signal is obtained; the three-phase voltage reference signal is converted into a component in a two-phase stationary frame, the subtraction between the component and a corresponding component practical voltage is conducted, and by means of calculation of a quasi-PR controller, a current reference signal in the two-phase stationary frame is obtained; and the subtraction between the current reference signal in the two-phase stationary frame and a corresponding component practical current is conducted, and a reference signal of an output voltage is obtained by a proportional (P) regulator, so that the regulation control of the alternating current inverter is achieved. The method provided by the invention is suitable for light-storage-type charging stations.

Description

technical field [0001] The invention relates to micro-grid technology, in particular to a technology based on a SOC-based quasi-PR droop control method for an optical-storage charging station. Background technique [0002] Electric Vehicle (EV) can effectively alleviate the current increasingly severe energy and environmental problems. With the global development of electric vehicles and the gradual construction and improvement of charging infrastructure, the future improvement of electric Grid, V2G) technology has important significance in many aspects such as environmental protection, power system stability and economic benefits. Judging from the current development situation, the light-storage electric vehicle charging station combined with photovoltaic power generation, energy storage system and electric vehicle charging and discharging system realizes the integrated utilization of solar power generation by electric vehicles in the form of micro-grid, and the two-way con...

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Problems solved by technology

However, in the actual working conditions of the low-voltage system, the resistive and inductive components of the line cannot be ignored, and there is a coupling relationship between active power and reactive power on the adjustment of voltage and frequency

[0005] In the article "Power Coupling Droop Control Strategy of Low-Voltage Micro-grid Three-phase Inverter" in the third issue of 2014, "Power Automation Equipment", based on the general droop control principle, an improved PQ-fU power coupling droop control method was proposed. Proportional Complex Integral (PCI) voltage control technology, but there is a problem that the complex algorithm is difficult to implement

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