Design and application of energy-fed electronic load and grid-connected scheme
馈能式电子负载及并网方案的设计与应用

摘要

本文设计并实现了一种可编程多通道馈能式电子负载及并网方案，旨在解决传统电子负载测试过程中的能源浪费问题，电子负载通过Boost隔离升压和双闭环控制，实现高精度恒压/恒流模式，并网逆变器选用中低压拓扑结构，具有快速响应、高转换效率（≥90%）及低谐波干扰等特点，符合相关国家标准。此外，系统采用模块化结构设计，优化散热风道，并配备高精度采样电路，使电压和电流测量精度分别达到0.2%和0.5%。该方案在稳定性、效率和兼容性方面均表现优异，适用于各类电源测试场景，并为可再生能源并网应用提供了可靠的技术支持，具有显著的节能效益和工程应用价值。

Abstract

This paper designs and implements a programmable multi-channel regenerative electronic load and grid connection scheme, aiming to solve the problem of energy waste in the traditional electronic load testing process. The electronic load achieves high-precision constant voltage/constant current modes through Boost isolated boost and dual closed-loop control. The grid inverter adopts a medium and low voltage topology structure, featuring fast response, high conversion efficiency (≥90%), and low harmonic interference, which complies with relevant national standards. Additionally, the system adopts a modular structure design, optimizes the heat dissipation air duct, and is equipped with high-precision sampling circuits, enabling voltage and current measurement accuracies of 0.2% and 0.5% respectively. This scheme performs excellently in terms of stability, efficiency, and compatibility, and is suitable for various power supply testing scenarios. It also provides reliable technical support for renewable energy grid connection applications, demonstrating significant energy-saving benefits and engineering application value.