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In order to address the issues of complex control strategy design and hardware circuit implementation of High Frequency AC (HFAC) resonant inverter power supply in Electric Vehicle (EV), this paper proposes a composite control strategy based on the combination of an integral controller and state feedback. Taking the typical LCLC DC-HFAC inverter as the research object, the Linear Quadratic Regulator (LQR) optimization control theory is used to realize the offline digital calculation of the feedback control parameters in the composite control strategy, which improves the dynamic performance of the DC/HFAC inverter and enhances the stability of the DC-HFAC inverter power supply. The control strategy and hardware circuit design are optimized by simplifying the parameter design process of the controller and the Phase-Shift Modulation (PSM) method. The experimental results show that the proposed LCLC DC-HFAC inverter power supply based on LQR optimized feedback composite control strategy not only has good steady-state performance, but also has high conversion efficiency and superior dynamic response speed.
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针对电动汽车高频交流(HFAC)谐振逆变电源控制策略设计复杂及硬件电路实现困难的问题,提出了一种基于积分控制器和状态反馈相结合的复合控制策略,以典型LCLC DC/HFAC逆变器为研究对象,采用线性二次型调节器(LQR)优化控制理论实现对复合控制策略中反馈控制参数的离线数字化计算,改善了DC/HFAC逆变器的动态性能,增强了DC-HFAC逆变电源的稳定性,并通过简化控制器的参数设计过程以及移相调制(PSM)方法优化了控制策略和硬件电路的设计。试验结果表明,所提出的基于LQR优化反馈复合控制策略的LCLC DC/HFAC逆变电源具备良好的稳态性能,且具有较高的转换效率和优越的动态响应速度。
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| 参数 | 数值 |
| 额定功率Po/W | 130 |
| 开关频率fs/kHz | 25 |
| 工作频率fo/kHz | 25 |
| 输入直流电压Vdc/V | 48 |
| 输入直流滤波电容Cdc/µF | 220 |
| 串联谐振电感Ls/µH | 110 |
| 串联谐振电容Cs/µF | 0.47 |
| 并联谐振电感Lp/µH | 17 |
| 并联谐振电容Cp/µF | 1.8 |
| 输出电压有效值Vo/V | 28 |
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DC/HFAC逆变电源的系统参数
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| 参数 | 数值 |
| 额定功率Po/W | 130 |
| 开关频率fs/kHz | 25 |
| 工作频率fo/kHz | 25 |
| 输入直流电压Vdc/V | 48 |
| 输入直流滤波电容Cdc/µF | 220 |
| 串联谐振电感Ls/µH | 110 |
| 串联谐振电容Cs/µF | 0.47 |
| 并联谐振电感Lp/µH | 17 |
| 并联谐振电容Cp/µF | 1.8 |
| 输出电压有效值Vo/V | 28 |
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| 控制策略 | THD/% | 转换效率/% | 动态调节时间/µs |
| 加载 | 减载 |
| 文献[8] | 2 | 92.5 | 240 | 240 |
| 文献[9] | 3.6 | 92 | 320 | 480 |
| 文献[10] | 1.58 | 90.5 | 140 | 140 |
| 文献[11] | 1.8 | 92.87 | 240 | 160 |
| 本文 | 1.85 | 94.17 | 120 | 140 |
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性能对比分析结果
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| 控制策略 | THD/% | 转换效率/% | 动态调节时间/µs |
| 加载 | 减载 |
| 文献[8] | 2 | 92.5 | 240 | 240 |
| 文献[9] | 3.6 | 92 | 320 | 480 |
| 文献[10] | 1.58 | 90.5 | 140 | 140 |
| 文献[11] | 1.8 | 92.87 | 240 | 160 |
| 本文 | 1.85 | 94.17 | 120 | 140 |
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