基于参数自适应的直流微源虚拟发电机控制策略

针对分布式电源波动及负载功率突变引起直流微电网母线电压大幅波动的问题,传统虚拟直流电机控制通过模拟直流电机外特性,可抑制母线电压波动,但动态响应较差.对此,提出一种参数自适应的虚拟直流发电机控制策略.以Buck/Boost变换器作为研究对象,结合下垂控制将虚拟直流发电机应用于多变换器并联系统中.建立其小信号模型,分析关...

Control strategy for a DC micro source virtual generator based on adaptive parameters

There can be large fluctuations in a DC microgrid bus voltage caused by distributed power fluctuations and sudden changes in load power. Traditional virtual DC motor control can suppress bus voltage fluctuations by simulating the external characteristics of DC motors, but the dynamic response is poor. Because of this, a parameter adaptive virtual DC generator control strategy is proposed. Taking the Buck/Boost converter as the research object, combined with droop control, a virtual DC generator is applied to the multi-converter parallel system; its small signal model is established, and the influence of the key control parameter changes on system stability is analyzed, and the adaptive adjustment equations of inertia coefficient and damping coefficient are derived. Finally, a simulation model and StarSim HIL experimental platform are built. The results show that the proposed control strategy effectively suppresses the DC bus voltage fluctuations and enables the system to have a faster dynamic response.This work is supported by the National Natural Science Foundation of China (No. 51709028 and No. 51979021), the Fundamental Research Funds for the Central Universities (No. 3132019317), and High-level Talents Innovation Support Project of Dalian City (No. 2019RQ008).