| 基于改进模糊PI控制的双有源桥DC-DC变换器 |
投稿时间：2022-09-19 修订日期：2022-12-04  点此下载全文 |
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| 基金项目:南京工程学院研究生科技创新项目(TB202217057) |
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| 中文摘要:在直流微电网中,针对直流负载扰动的过程会造成直流电压动态响应速度缓慢；同时,负荷投切时会引起直流电压超调量大的问题。采用了改进模糊PI控制,并将其应用在直流微电网中储能单元的双有源桥DC-DC变换器。首先,在现有模糊PI控制中加入预处理环节,该环节对直流电压的误差大小及时判断与跟踪,使直流母线电压迅速达到参考值,提高了直流电压的动态响应速度；其次,分析了现有模糊PI控制算法的规则表对参数调节过程中存在精确度不足的规则,对其进行修改得到改进模糊PI的规则表,以减小直流电压的超调量；最后,对所提的改进模糊PI控制进行仿真对比验证。仿真结果表明:对现有的PI控制器和模糊PI控制器而言,改进的模糊PI控制器在稳态响应速度、超调量以及抗干扰性能上得到显著提高,提高了直流母线电压质量。 |
| 中文关键词:直流微电网 双有源桥DC-DC变换器 改进的模糊PI控制 模糊规则表 稳态响应 |
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| Dual active bridge DC-DC converter based on improved fuzzy PI control |
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| Abstract:In DC microgrid, the dynamic response speed of DC voltage is slow due to the disturbance of DC load. At the same time, dc voltage overshoot will be caused when load switching. Improved fuzzy PI control is adopted and applied to the dual active bridge DC-DC converter of energy storage unit in the DC microgrid. Firstly, a pre-processing link is added to the existing fuzzy PI control, which judges and tracks the error of the DC voltage in time, so that the DC bus voltage quickly reaches the reference value, and the dynamic response speed of the DC voltage is improved; Secondly, analyzed the rule base of the existing fuzzy PI control algorithm for the lack of precision in the parameter adjustment process, and modified it to obtain an improved fuzzy PI rule table to reduce the overshoot of the DC voltage; Finally, the improved fuzzy PI control is simulated and verified. The simulation results show that for the existing PI controller and fuzzy PI controller, the improved fuzzy PI controller has significantly improved steady-state response speed, overshoot and anti-interference performance, and improved the voltage quality of DC bus. |
| keywords:DC microgrid dual active bridge DC-DC converter improved fuzzy PI control fuzzy rule base steady state response |
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