Voltage Stabilization Control for Dual Three-Phase Permanent Magnet Synchronous Generator System Based on Quadrature Axis Current Calculation and Feedback of the Energy Stored in Capacitor
Hao Liang, Zhao Wenxiang, Ji Jinghua, Xu Dezhi, Wang Yuxue
School of Electrical and Information Engineering Jiangsu University Zhenjiang 212013 China
Abstract：In full electrification of high-end equipment, such as special vehicles, warships and aircraft, direct current power systems with generators as the core works under the condition of rapid load change. The dual three-phase permanent magnet synchronous generator (DTP-PMSG) has a high fault tolerance rate, low voltage, and high power, suitable for the high-end equipment field limited by output voltage and space volume. However, without considering the nonlinear relationship between bus voltage and quadrature axis current, the conventional bus voltage control method had the disadvantages of long voltage recovery time and large voltage fluctuation when the load changes rapidly. Recently, some methods were presented to analyze the physical meaning of the voltage outer loop and establish the connection between bus voltage and output power, but most of them suffered from high design costs due to complex control parameter. To address these issues, this paper proposes a voltage stabilization control strategy based on quadrature axis current calculation and feedback of the energy stored in capacitor. Firstly, the DTP-PMSG mathematical model is established to deduce the relationship between electromagnetic power and quadrature axis current. Secondly, according to PWM rectifier topology, the mathematical model of the energy and power exchange of the bus capacitor is established to derive the calculation formula of quadrature axis current. Thirdly, combined with the digital realization of the actual control system, the designed time parameter optimizes quadrature axis current calculation formula. Finally, considering that the calculated value of the quadrature axis current will have errors due to the inaccuracy of the DTP-PMSG mathematical model, a capacitor energy storage PI controller is designed to compensate the errors caused by the modeling and realizes the accurate control of the bus voltage. Simulation results show that, when the load is 100Ω, the calculated quadrature axis current value accounts for the main component of the given quadrature axis current, and the values are almost equal. After sudden loading to 35Ω, the calculation of quadrature axis current adjusts quickly to 4.5A to meet output power requirements. Meanwhile, the increase of system power brings about the increase of loss, resulting in an equivalent 0.5A quadrature current loss, which is compensated by capacitor energy storage feedback. Then the experimental results are consistent with the simulation results. Compared with the traditional method, the proposed control strategy reduces the voltage recovery time by about 20% and the voltage fluctuation amplitude by about 35%, which demonstrates the effectiveness of using the proposed. In addition, the experiment draws the curve of bus voltage fluctuation amplitude with flux linkage and capacitance value. The trend suggests that the proposed control strategy has a certain dependence on the flux linkage parameter, the change of the capacitance value has little influence on the bus voltage, and the strategy can adapt to the error of the actual capacitor value. The following conclusions can be drawn from the simulation and experimental analysis: ① Through the calculation of quadrature axis current, the setting of the quadrature axis current inner loop is directly obtained, replacing the traditional method that only relies on the voltage outer loop adjusted by the PI controller, and speeding up the response of the voltage outer loop. ② The introduction of capacitive energy storage feedback compensates the calculation error of the quadrature axis current caused by system loss to achieve the accuracy of bus voltage control. Based on clear physical implications, the proposed method can effectively shorten the bus voltage recovery time and reduce the voltage fluctuation amplitude. Although this paper takes DTP-PMSG as the experimental object for analysis, and the method is also applicable to three-phase permanent magnet synchronous motors after proper modification.
郝亮, 赵文祥, 吉敬华, 许德志, 王玉雪. 交轴电流计算与电容储能反馈的双三相永磁同步发电机系统稳压控制[J]. 电工技术学报, 2023, 38(2): 353-364.
Hao Liang, Zhao Wenxiang, Ji Jinghua, Xu Dezhi, Wang Yuxue. Voltage Stabilization Control for Dual Three-Phase Permanent Magnet Synchronous Generator System Based on Quadrature Axis Current Calculation and Feedback of the Energy Stored in Capacitor. Transactions of China Electrotechnical Society, 2023, 38(2): 353-364.
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