|
|
|
| Research on Control of Wideband Variable-Frequency Inverters Based on Harmonics Quasi Resonant Controller with Frequency Reference Adapting |
| Liu Haichun1, Guo Shian1, Qian Qiang2, Xie Shaojun1 |
1. College of Automation Engineering Nanjing University of Aeronauticsand Astronautics Nanjing 211106 China;
2. College of Energy and Power Hohai University Nanjing 211100 China |
|
|
|
Abstract With the development of more electric aircraft (MEA) and the increase of aircraft power system capability, AC power system of 360~800 Hz wide variable frequency has become one of the most important development trends due to its high reliability, high power density, and huge individual machine capability. However, since more and more electric and electronic equipment, especially nonlinear loads such as rectifiers, are applied in aircraft, the harmonics induced by those loads significantly impact the voltage quality of the aircraft grid. Unlike a 50 Hz inverter, the harmonic frequency of a medium-frequency inverter is very high, usually beyond the control band, which leads to a relatively small phase margin and great difficulty in control. Typical methods, such as repetitive control, do not satisfy the requirement when the power source frequency varies. QPR (quasi-proportional resonant) and HQR (harmonics quasi-resonant) control performs poor stability since its phase changes suddenly at the resonant frequency.
The paper focuses on harmonics suppression for 360~800 Hz wide variable frequency AC power inverter, as well as the stability of the voltage controller. First, the structure of a single-phase inverter with digital control is described, and then the delay of digital control, which greatly influences control stability, is derived. Next, the stability of the control system with the application of HQR is discussed. The system phase margin is very small, even negative. Due to large frequency variation, a constant angle compensation cannot ensure the control system’s stability. To simplify the design of the voltage controller, inductor current feedback active damping with digital control delay compensation is designed, which provides a suitable stability margin and minimum phase characteristic for the controlled object and suppresses the resonance peak. Furthermore, the I (integration)+QPR control scheme is proposed to improve the tracking ability of fundamental voltage.
As the frequency varies from 360 Hz to 800 Hz, for HQR, a constant angle compensation cannot guarantee the voltage controller’s stability. Accordingly, a frequency self-adapted HQR-PC (harmonics quasi-resonant with phase compensation) is proposed, compensating a specific angle for the control object to acquire a sufficient stability margin under a wide frequency reference range. After that, the stability of the control system is verified by root locus figures. The digital control implementation method of polynomial fitting of compensation angle is also given. It is indicated that the control scheme has high open-loop gain at fundamental and harmonics frequencies by open-loop frequency response, and harmonics can be suppressed with simulation verification.
Finally, an experimental platform of 600 W medium frequency inverter power supply with a wide output frequency range is built. The control performance of the proposed control methods is tested with resistive and nonlinear loads, respectively. The results show that the medium-frequency inverter can output voltage with small harmonics, and the total harmonics distortion of the output voltage conforms to the industrial power supply standard under the frequency reference range. Moreover, the inverter shows excellent static and dynamic performance.
|
|
Received: 17 August 2023
|
|
|
|
|
|
[1] 张卓然, 许彦武, 姚一鸣, 等. 多电飞机电力系统及其关键技术[J]. 南京航空航天大学学报, 2022, 54(5): 969-984.
Zhang Zhuoran, Xu Yanwu, Yao Yiming, et al.Electric power system and key technologies of more electric aircraft[J]. Journal of Nanjing University of Aeronautics & Astronautics, 2022, 54(5): 969-984.
[2] Buticchi G, Bozhko S, Liserre M, et al.On-board microgrids for the more electric aircraft-technology review[J]. IEEE Transactions on Industrial Elec- tronics, 2019, 66(7): 5588-5599.
[3] Arricibita D, Sanchis P, González R, et al.Impedance emulation for voltage harmonic compensation in PWM stand-alone inverters[J]. IEEE Transactions on Energy Conversion, 2017, 32(4): 1335-1344.
[4] Zhou Leming, Wu Wenhua, Chen Yandong, et al.Harmonic voltage distortion damping method for parallel-connected LCL-type inverters in islanded operation[J]. IEEE Transactions on Industrial Elec- tronics, 2019, 66(11): 9032-9044.
[5] Chen Xinran, Ruan Xinbo, Yang Dongsheng, et al.Injected grid current quality improvement for a voltage-controlled grid-connected inverter[J]. IEEE Transactions on Power Electronics, 2018, 33(2): 1247-1258.
[6] 飞机供电特性: GJB2573-1996[S].
[7] 钱强, 张犁, 过仕安, 等. 抗电感参数扰动的400Hz逆变器控制策略研究[J]. 中国电机工程学报, 2022, 42(增刊1): 256-268.
Qian Qiang, Zhang Li, Guo Shian, et al.Research on control strategy of 400Hz inverter against inductance parameter disturbance[J]. Proceedings of the CSEE, 2022, 42(S1): 256-268.
[8] 杨明, 杨倬, 李玉龙, 等. 弱电网下基于电网电压前馈的并网逆变器阻抗重塑控制策略[J]. 电工技术学报, 2024, 39(8): 2553-2566.
Yang Ming, Yang Zhuo, Li Yulong, et al.Impedance remodeling control strategy of grid-connected inverter based on feedforward voltage under weak grid[J]. Transactions of China Electrotechnical Society, 2024, 39(8): 2553-2566.
[9] Ramos G A, Ruget R I, Costa-Castelló R.Robust repetitive control of power inverters for standalone operation in DG systems[J]. IEEE Transactions on Energy Conversion, 2020, 35(1): 237-247.
[10] 朱元, 朱醴亭, 肖明康, 等. 基于几何约束优化的重复控制器及PMSM电流谐波抑制应用[J]. 电工技术学报, 2024, 39(4): 1059-1073.
Zhu Yuan, Zhu Liting, Xiao Mingkang, et al.Repetitive controller based on geometric constraint optimization and its application to current harmonic suppression of PMSM[J]. Transactions of China Electrotechnical Society, 2024, 39(4): 1059-1073.
[11] Zhao Qiangsong, Ye Yongqiang.A PIMR-type repetitive control for a grid-tied inverter: structure, analysis, and design[J]. IEEE Transactions on Power Electronics, 2018, 33(3): 2730-2739.
[12] 李金玉, 陈杰, 龚春英, 等. 一种提高级联H桥逆变器功率不平衡运行能力的控制策略[J]. 电工技术学报, 2023, 38(10): 2731-2743.
Li Jinyu, Chen Jie, Gong Chunying, et al.A control strategy to improve working ability of cascaded H-bridge inverter under power imbalance[J]. Transa- ctions of China Electrotechnical Society, 2023, 38(10): 2731-2743.
[13] Wang Yachao, Darwish A, Holliday D, et al.Plug-in repetitive control strategy for high-order wide-output range impedance-source converters[J]. IEEE Transa- ctions on Power Electronics, 2017, 32(8): 6510-6522.
[14] Liu Zhichao, Zhou Keliang, Yang Yongheng, et al.Frequency-adaptive virtual variable sampling-based selective harmonic repetitive control of power inverters[J]. IEEE Transactions on Industrial Electronics, 2021, 68(11): 11339-11347.
[15] Alves A G P, Rolim L G B, da Silva Dias R F, et al. Analysis of grid-connected VSCs subject to voltage harmonic disturbances: prediction and design tool of resonant controllers[J]. IEEE Transactions on Energy Conversion, 2023, 38(1): 239-249.
[16] 黄仁志, 全相军, 吴在军, 等. 基于多重谐振控制器的参考值前馈自适应控制[J]. 电工技术学报, 2022, 37(16): 4212-4224.
Huang Renzhi, Quan Xiangjun, Wu Zaijun, et al.A multiple resonant based on reference feedforward adaptive voltage control of three-phase inverter[J]. Transactions of China Electrotechnical Society, 2022, 37(16): 4212-4224.
[17] Golestan S, Ebrahimzadeh E, Guerrero J M, et al.An adaptive resonant regulator for single-phase grid-tied VSCs[J]. IEEE Transactions on Power Electronics, 2018, 33(3): 1867-1873.
[18] Peng Cong, Sun Jinji, Song Xinda, et al.Frequency- varying current harmonics for active magnetic bearing via multiple resonant controllers[J]. IEEE Transa- ctions on Industrial Electronics, 2017, 64(1): 517-526.
[19] Qian Qiang, Xie Shaojun, Xu Jinming, et al.Passivity-based output admittance shaping of the converter-side current-controlled grid-tied inverter to improve the robustness to the grid impedance[J].IET Power Electronics, 2020, 13(10): 1956-1965.
[20] 沈姝衡, 方天治, 章益凡. 高带宽数字控制LCL型并网逆变器及其提高并网系统鲁棒性的谐振抑制技术研究[J]. 电工技术学报, 2022, 37(21): 5548-5561.
Shen Shuheng, Fang Tianzhi, Zhang Yifan.A high- bandwidth digital-control LCL-type grid-tied inverter and resonance-suppressing technique for improving the robustness of grid-connected system[J]. Transa- ctions of China Electrotechnical Society, 2022, 37(21): 5548-5561.
[21] 施烨, 吴在军, 窦晓波, 等. 三相四线变换器相位补偿控制策略研究[J]. 中国电机工程学报, 2017, 37(10): 2971-2985.
Shi Ye, Wu Zaijun, Dou Xiaobo, et al.Research on phase compensation control schemes for three-phase four-wire converters[J]. Proceedings of the CSEE, 2017, 37(10): 2971-2985.
[22] 民用飞机地面电源供电特性要求: HB 93-2003[S]. |
|
|
|
2024, Vol. 39 
