Improved Deadbeat Control of Current-Source PWM Rectifiers with Load Feed-Forward Compensation
He Lipeng1,2, Guo Qiang1,2, Xiao Huihui1,2, Huang Yongjun1,2, Xiang Wenkai1,2
1. School of Electrical and Electronic Engineering Chongqing University of Technology Chongqing 400054 China; 2. Chongqing Engineering Research Center of Energy Internet Chongqing 400054 China
Abstract：In a three-phase current source PWM rectifier (CSR), it is necessary to maintain good dynamic performance and supply constant DC output voltage. However, the DC-side voltage and DC-side current double closed-loop control strategy has a slow dynamic response and is prone to an output voltage of DC-side overshoot during load sudden changes. Therefore, this paper proposes an improved control strategy scheme combined with deadbeat predictive current control and load power feedforward compensation. Firstly, based on the power conservation theory, the power relationship between the input side and the output side of the rectifier is analyzed, and the feedforward current is obtained as the reference current of the inner loop current by feedforward compensation of the DC side power. Secondly, the discrete mathematical model of a three-phase current source PWM rectifier in a two-phase static coordinate system is analyzed. The equation relationship between grid-side current & voltage and AC-side voltage is deduced from the mathematical model according to that the internal loop current is tracked by deadbeat control. However, due to the influence of inductance parameters and control delay, the grid-side current's control accuracy and waveform quality will be degraded. Accordingly, an improved deadbeat control strategy is adopted. The control algorithm is predicted to the time k+2, and the current at the time k+1 is eliminated by the arithmetic iteration process. It can avoid the deepening of the assumption approximation, make the current at the time k directly related to the current at the time k+2, and simplify the calculation process. The results show that this method improves the control accuracy of grid-side current and reduces the current harmonic content. Finally, the root locus method is used to analyze the stability of the current inner loop. The comparative simulation and experimental results show that the improved scheme is superior to the conventional scheme in steady and dynamic conditions. Under steady-state conditions, the grid-side voltage and the grid-side current are in the same phase, and the grid-side current is sinusoidal at half-load and full-load operation. Its total harmonic distortion rate (THD) is 2.08% and 2.48%, respectively. The DC-side output voltage keeps stable output at a given value without voltage fluctuations. Under dynamic conditions, the output voltage of the DC side can quickly restore stability, regardless of the sudden increase or decrease of system load, and its fluctuation amplitude is less than 15V. The following conclusions can be drawn from the simulation and experimental analysis: (1) The proposed control strategy enables the CSR system to have good performance. Under different power loads, unit power factor operation can be realized. The current THD values are below the limits, the output voltage is stable, and the transient system response is rapid. (2) The dynamic response of the system can be effectively improved by introducing load power feedforward into the outer loop. When the load suddenly increases or decreases, the DC output voltage can be quickly restored to a given value, and the overshoot and undershoot voltages are effectively suppressed.
[1] 郭文杰, 林飞, 郑琼林. 三相电压型PWM整流器的级联式非线性PI控制[J]. 中国电机工程学报, 2006, 26(2): 138-142. Guo Wenjie, Lin Fei, Zheng Qionglin.The cascaded nonlinear PI control for three-phase voltage source PWM rectifier[J]. Proceedings of the CSEE, 2006, 26(2): 138-142. [2] 李和明, 朱晓荣, 石新春, 等. 电流型PWM整流器的不平衡控制[J]. 电工技术学报, 2010, 25(7): 85-92. Li Heming, Zhu Xiaorong, Shi Xinchun, et al.A control scheme of current-source PWM rectifier under unbalanced supply conditions[J]. Transactions of China Electrotechnical Society, 2010, 25(7): 85-92. [3] 谈龙成, 李耀华, 刘丛伟, 等. 三相电流型PWM整流器的功率因数控制方法[J]. 电工技术学报, 2010, 25(2): 86-93. Tan Longcheng, Li Yaohua, Liu Congwei, et al.Power factor control method of three phase current source PWM rectifier[J]. Transactions of China Elec-trotechnical Society, 2010, 25(2): 86-93. [4] 秦海鸿, 张鑫, 朱梓悦, 等. 电流型PWM整流器叠流时间对网侧电流影响及其抑制方法[J]. 电工技术学报, 2016, 31(12): 142-152. Qin Haihong, Zhang Xin, Zhu Ziyue, et al.Influence of overlap time on the AC grid current of current source PWM rectifier and restraining method[J]. Transactions of China Electrotechnical Society, 2016, 31(12): 142-152. [5] 郭强, 刘和平, 彭东林, 等. 静止坐标系下电流型PWM整流器电流环控制策略研究及其参数设计[J]. 中国电机工程学报, 2014, 34(15): 2353-2361. Guo Qiang, Liu Heping, Peng Donglin, et al.A novel control strategy and its parameter design of the current-loop in a stationary frame for current-source PWM rectifiers[J]. Proceedings of the CSEE, 2014, 34(15): 2353-2361. [6] Zhang Yu, Yi Yongxian, Dong Peimeng, et al.Simplified model and control strategy of three-phase PWM current source rectifiers for DC voltage power supply applications[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2015, 3(4): 1090-1099. [7] Bai Zhihong, Ruan Xinbo, Zhang Zhongchao.A generic six-step direct PWM (SS-DPWM) scheme for current source converter[J]. IEEE Transactions on Power Electronics, 2010, 25(3): 659-666. [8] 张强, 吴延飞, 张保顺, 等. 基于三相电流型五电平整流器的空间矢量脉宽调制算法[J]. 电工技术学报, 2020, 35(24): 5134-5141. Zhang Qiang, Wu Yanfei, Zhang Baoshun, et al.Space vector pulse width modulation strategy based on three-phase five-level current source rectifier[J]. Transactions of China Electrotechnical Society, 2020, 35(24): 5134-5141. [9] 郭强, 刘和平, 彭东林, 等. 电流型PWM整流器多环控制策略及其参数设计[J]. 中国电机工程学报, 2015, 35(5): 1193-1202. Guo Qiang, Liu Heping, Peng Donglin, et al.A multi-loop control strategy and parameter design for current-source PWM rectifiers[J]. Proceedings of the CSEE, 2015, 35(5): 1193-1202. [10] Nussbaumer T, Heldwein M L, Gong Guanghai, et al.Comparison of prediction techniques to compensate time delays caused by digital control of a three-phase Buck-type PWM rectifier system[J]. IEEE Transa-ctions on Industrial Electronics, 2008, 55(2): 791-799. [11] Xu Fan, Guo Ben, Xu Zhuxian, et al.Paralleled three-phase current-source rectifiers for high-efficiency power supply applications[J]. IEEE Transa-ctions on Industry Applications, 2015, 51(3): 2388-2397. [12] Xu Fan, Guo Ben, Tolbert L M, et al.An all-SiC three-phase Buck rectifier for high-efficiency data center power supplies[J]. IEEE Transactions on Industry Applications, 2013, 49(6): 2662-2673. [13] 郭强, 周琛力, 李山. 面向电流源型PWM整流器直流侧电压的多环路控制策略[J]. 电工技术学报, 2022, 37(8): 2051-2063. Guo Qiang, Zhou Chenli, Li Shan.A multiple loops control strategy based on DC link voltage of current source PWM rectifiers[J]. Transactions of China Electrotechnical Society, 2022, 37(8): 2051-2063. [14] 易永仙, 张宇, 李民英, 等. 电流源型PWM整流器带容性负载的解耦控制方法[J]. 电工技术学报, 2016, 31(4): 95-103. Yi Yongxian, Zhang Yu, Li Minying, et al.Decoupling control strategy of current-source PWM rectifier with capacitive load[J]. Transactions of China Electrotechnical Society, 2016, 31(4): 95-103. [15] 姜卫东, 李王敏, 佘阳阳, 等. 直流电容储能反馈和负载功率前馈的PWM整流器控制策略[J]. 电工技术学报, 2015, 30(8): 151-158. Jiang Weidong, Li Wangmin, She Yangyang, et al.Control strategy for PWM rectifier based on feedback of the energy stored in capacitor and load power feed-forward[J]. Transactions of China Electro-technical Society, 2015, 30(8): 151-158. [16] 姚绪梁, 王旭, 冯泽文. 改善三相电压型PWM整流器动态性能的研究[J]. 电工技术学报, 2016, 31(增刊1): 169-175. Yao Xuliang, Wang Xu, Feng Zewen.Research on of improvement of the dynamic ability for PWM rectifier[J]. Transactions of China Electrotechnical Society, 2016, 31(S1): 169-175. [17] 朱进权, 葛琼璇, 王晓新, 等. 基于自抗扰和负载功率前馈的高速磁悬浮系统PWM整流器控制策略[J]. 电工技术学报, 2021, 36(2): 320-329. Zhu Jinquan, Ge Qiongxuan, Wang Xiaoxin, et al.Control strategy for PWM rectifier of high-speed maglev based on active disturbance rejection control and load power feed-forward[J]. Transactions of China Electrotechnical Society, 2021, 36(2): 320-329. [18] 陈燕东, 罗安, 周乐明, 等. 一种功率前馈的鲁棒预测无差拍并网控制方法[J]. 中国电机工程学报, 2013, 33(36): 62-70, 10. Chen Yandong, Luo An, Zhou Leming, et al.A robust predictive deadbeat grid-connected control method based on power feed-forward control[J]. Proceedings of the CSEE, 2013, 33(36): 62-70, 10. [19] Wang Ping, Bi Yuxuan, Gao Fei, et al.An improved deadbeat control method for single-phase PWM rectifiers in charging system for EVs[J]. IEEE Transactions on Vehicular Technology, 2019, 68(10): 9672-9681. [20] Wang Bo, Dong Zhen, Yu Yong, et al.Static-errorless deadbeat predictive current control using second-order sliding-mode disturbance observer for induction machine drives[J]. IEEE Transactions on Power Electronics, 2018, 33(3): 2395-2403. [21] 余晨辉, 汪凤翔, 林贵应. 基于在线扰动补偿的三电平PWM整流器级联式无差拍控制策略[J]. 电工技术学报, 2022, 37(4): 954-963. Yu Chenhui, Wang Fengxiang, Lin Guiying.Cascaded deadbeat control strategy with online disturbance compensation for three-level PWM rectifier[J]. Transactions of China Electrotechnical Society, 2022, 37(4): 954-963. [22] 曹穆, 许嘉沄, 王珊珊, 等. 不平衡电网下Vienna整流器无差拍预测控制[J]. 电力电子技术, 2022, 56(4): 4-6, 11. Cao Mu, Xu Jiayun, Wang Shanshan, et al.Deadbeat prediction control of Vienna rectifier under unbalanced power grid[J]. Power Electronics, 2022, 56(4): 4-6, 11. [23] Feng Yuelu, Konishi Y, Nakaoka M.Deadbeat control scheme for three phase current-fed PFC converter with an optimum PWM strategy[C]//IEEE 1999 International Conference on Power Electronics and Drive Systems, Hong Kong, China, 2002: 485-488. [24] Nishida K, Konishi Y, Nakaoka M.Novel current control scheme with deadbeat algorithm and adaptive line enhancer for three-phase current-source active power filter[C]//IEEE 2001 Industry Applications Conference, Chicago, IL, USA, 2001: 194-201. [25] 李山, 马雯, 郭强, 等. 非理想电网条件下PWM整流器优化预测功率控制[J]. 电工技术学报, 2022, 37(18): 4745-4756. Li Shan, Ma Wen, Guo Qiang, et al.Optimal predictive power control of PWM rectifier under nonideal grid conditions[J]. Transactions of China Electrotechnical Society, 2022, 37(18): 4745-4756.
2024, Vol. 39 
