基于无源性的直流微电网并联变换器控制策略

针对可再生能源聚合而形成带混合负载的直流微电网稳定性与协调性问题,提出一种将无源控制与改进非线性干扰观测器前馈补偿相结合的新型控制算法,在消除恒功率负载对直流微电网的影响的同时提高了系统鲁棒性,再利用线路阻抗补偿来改善分流精度与实现电压无偏差。该文利用Matlab/Simulink搭建并联DC-DC变换器仿真模型进行验证,通过对比传统无源控制与比例积分调节的无源控制表明,提出的控制策略抑制了恒功率负载与线路阻抗对直流微电网的影响。最后,在Opal-RT半实物实验平台验证了该策略的有效性。

CONTROL STRATEGY OF PARALLEL CONVERTERS IN DC MICROGRID BASED ON PASSIVITY

Aiming at the stability and coordination of DC microgrid with mixed load formed by renewable energy aggregation, a new control algorithm combining passive control and improved nonlinear disturbance observer feedforward compensation is proposed, which not only eliminates the influence of constant power load on DC microgrid, but also improves the system robustness, Then the line impedance compensation is used to improve the shunt accuracy and realize no voltage deviation. The research uses Matlab/Simulink to build a parallel DC-DC converter, simulation model for verification. By comparing the traditional passive control and proportional integral regulation passive control, it is shown that the proposed control strategy suppresses the influence of constant power load and line impedance. Finally, the effectiveness of the strategy was verified on the Opal-RT semi-physical experiment platform.