Microgrid semi-physical testing circuit and method on basis of feedback type load simulator

Abstract

The invention provides a microgrid semi-physical testing circuit and method on the basis of a feedback type load simulator. A semi-physical way means that tested objects are material objects and load for testing is simulated. By means of a characteristic that the feedback type load simulator simulates constant-impedance load, nonlinear load and load of an asynchronous motor to substitute for actual constant-impedance load, nonlinear load and load of the asynchronous motor, dynamic characteristics and power quality of a main power source of an energy storage system of a microgrid can be verified and tested. During testing, power balance between a load characteristic simulation input end of the feedback type load simulator and a unity power factor feedback converter is maintained, and load characteristic simulation and energy feedback are realized. The problems of many load types, high cost, energy waste of feedback and reduction of long-time running adjustment accuracy when dynamic characteristics and power quality of a main power source of an energy storage system of a microgrid are verified and tested are solved.

Description

technical field [0001] The invention relates to a semi-physical testing method of a micro-grid, in particular to a semi-physical testing method of a micro-grid based on a feedback load simulation device. Background technique [0002] The output of distributed power generation such as wind power and solar photovoltaic power generation is volatile and intermittent. When connected to the grid on a large scale, it will affect the safe and stable operation of the grid. In order to suppress the impact and negative impact of distributed power generation on the power grid and give full play to the benefits and value of distributed power generation, in 2001, scholars such as R.H.Lasseter in the United States proposed the concept of microgrid. [0003] A typical microgrid consists of a variety of distributed power generation units, energy storage systems and loads. Microgrid is a new type of network structure, an autonomous system that can realize self-control, protection and managem...

AI Technical Summary

Problems solved by technology

When performing verification tests on the dynamic characteristics and power quality of main power sources such as energy storage systems of microgrids or micro gas turbines, it is generally necessary to match typical loads, such as actual constant impedance loads, nonlinear loads, and asynchronous motor loads, which results in test There are many types of actual loads involved, occupying a large space, and wiring is troublesome

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