Grid environment simulation device for inverter grid-connection experiment

Abstract

The invention provides a grid environment simulation device for inverter grid-connection experiment. The grid environment simulation device comprises a three-phase power-frequency alternating-current (AC) waveform generation unit, a phase-A power-frequency voltage stabilization and output unit, a phase-A current constant-current output unit, and a phase-A real-time data acquisition unit assembly. A phase-A voltage signal generated by the three-phase power-frequency AC waveform generation unit enters the Phase-A voltage stabilization and output unit, and a phase-A current signal enters the three-phase current constant-current output unit; the phase-A voltage stabilization and output unit and the phase-A current constant-current output unit enter the phase-A real-time data acquisition unit assembly; the phase-A real-time data acquisition unit assembly returns to the three-phase power-frequency AC waveform generation unit; the phase-A real-time data acquisition unit assembly outputs a phase-A voltage signal, and the generation of phase-B and phase-C voltage signals is same with that of the phase-A voltage signal; and the other ends of phase-A, phase-B and phase-C main loops are connected to form a neutral line N of a three-phase power-frequency grid simulation environment.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and relates to a power supply device, in particular to a device for simulating a power grid environment used in an inverter grid connection experiment. Background technique [0002] An inverter is a device that converts DC power into AC power. The most widely used inverter that converts DC power into industrial frequency AC power. [0003] Solar photovoltaic power generation technology produces DC power, which needs to be converted from DC to power frequency AC by an inverter to adapt to the power supply conditions of many AC appliances. The AC power output by the inverter is connected to the public grid and must meet the conditions of the same frequency and phase, and the purpose of transmitting power to the grid is achieved by adjusting the voltage. Therefore, the function and performance requirements of photovoltaic grid-connected inverters must be strictly tested. [0004] To con...

AI Technical Summary

Problems solved by technology

This environment is far from the actual working environment of the grid-connected inverter, so this measurement cannot accurately and truly reflect the characteristics of the grid-connected inverter, such as islanding effect, low voltage ride-through effect

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