摘要
固态变压器(Solid State Transformer,SST)的直流端口可供电动汽车(Electric Vehicles,EV)和可再生能源发电设备接入直流微网,然而母线电压的稳定直接影响直流负载和电动汽车充电站的稳定运行,故保证直流母线电压的稳定至关重要。依据基尔霍夫电压定律和功率传输原理推出SST的一次侧直流母线电压不仅受网侧电压、电流的扰动影响,同时还与隔离级移相比、二次侧直流母线电压有关;基于微分平坦理论设计出SST的输入级和隔离级两级联动控制策略,通过前馈控制量和误差反馈补偿量能使一次侧直流母线电压较光滑地跟踪其参考值。最后在PSCAD平台搭建模型,针对多种工况进行仿真测试,结果表明所提控制策略优于传统的d-q解耦控制,能够更好地实现一次侧直流母线电压的稳定。
The DC port of solid state transformer can conveniently provide electric vehicles and renewable energy power generation equipment to connect to DC micro-grid.But the stability of bus voltage directly affects the DC load and the stable operation of electric vehicle charging station,therefore,it is very important to ensure the stability of DC bus voltage.According to Gustav Kirchhoff's law of voltage and Principle of power transmission,the primary DC bus voltage of solid state transformer was not only affected by the disturbances of grid voltage and current,but also related to the phase shift ratio of isolation stage and the secondary DC bus voltage.Based on the theory of differential flatness,a two-stage linkage control strategy of input stage and isolation stage of solid state transformer was proposed.Finally,the model was built on PSCAD platform to simulate for various working conditions,and the simulation results showed that the proposed control strategy was superior to the traditional d-q decoupling control,and could achieve better stability of the primary DC bus voltage.
作者
刘丽莉
刘俊
包洪印
LIU Lili;LIU Jun;BAO Hongyin(China Shipbuilding Heavy Industry Haiwei(Xinjiang)New Energy Co.,Ltd.,Urumqi 830000,China)
出处
《自动化与仪器仪表》
2023年第7期107-112,共6页
Automation & Instrumentation
基金
新疆维吾尔自治区重大科技专项(2022A1001-3)。
关键词
固态变压器
电动汽车
可再生能源
微分平坦控制
直流母线电压
solid state transformer
electric vehicle
renewable energy
differential flatness based control
DC bus voltage
