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The output performance of three-level inverters will be deteriorated under two-phase loads condition if conventional discontinuous PWM (DPWM) strategies are adopted. To solve the above issue, the amplitude and the phase angle of basic voltage vectors are modified in this paper. Accordingly, sectors and triangles of the space vector diagram are reconsidered, duty cycles of basic vectors synthesized the reference vector are recalculated. And then four types of DPWM applicable for two-phase load are put forward. Although the harmonic distortion of the output waveform is reduced, discontinuous intervals are not optimum distributed. To further improve the output waveform quality, the amplitude of average current ripple vector is introduced as the evaluation index to redistribute discontinuous intervals of phase voltage in each fundamental period. Then, a hybrid DPWM strategy is presented and the harmonic distortion of the output waveform is minimized. Meanwhile, the neutral-point voltage ripple and the switching loss are also suppressed. The effectiveness of the hybrid DSVM strategy is verified by both simulation and experimental results.
Guozheng Zhang; Shihao Peng; Qiang Geng; Tingna Shi; Changliang Xia. Hybrid Discontinuous Space Vector PWM Strategy for Three-Level Inverters under Two-phase Loads Condition. IEEE Transactions on Power Electronics 2021, PP, 1 -1.
AMA StyleGuozheng Zhang, Shihao Peng, Qiang Geng, Tingna Shi, Changliang Xia. Hybrid Discontinuous Space Vector PWM Strategy for Three-Level Inverters under Two-phase Loads Condition. IEEE Transactions on Power Electronics. 2021; PP (99):1-1.
Chicago/Turabian StyleGuozheng Zhang; Shihao Peng; Qiang Geng; Tingna Shi; Changliang Xia. 2021. "Hybrid Discontinuous Space Vector PWM Strategy for Three-Level Inverters under Two-phase Loads Condition." IEEE Transactions on Power Electronics PP, no. 99: 1-1.
In the motor drive system fed by multilevel inverter, the problems such as the complexity of reference voltage synthesis, high common mode voltage(CMV) and high switching loss are usually the obstacles to the practical application. In order to reduce the computational complexity and improve the performance of PMSM, a novel SVPWM scheme which is practical and independent of level number is proposed for PMSM vector control. First, the space vector plane is re-divided, and the coordinates of the nearest three vectors(NTVs) and their duty cycles can be obtained directly by determining the location of reference vector, which simplifies the calculation and does not need any iterative algorithm. Then, the optimal switching state and switching sequence are selected online so as to ensure the minimum switching loss under the premise of minimum CMV. This paper provides an original method and new idea for motor drive system fed by multilevel inverter. Finally, the practicability and validity of the proposed method are verified by simulation and experiment.
Huan Yao; Yan Yan; Tingna Shi; Guozheng Zhang; Zhiqiang Wang; Changliang Xia. A Novel SVPWM Scheme for Field-Oriented Vector-Controlled PMSM Drive System Fed by Cascaded H-Bridge Inverter. IEEE Transactions on Power Electronics 2021, 36, 8988 -9000.
AMA StyleHuan Yao, Yan Yan, Tingna Shi, Guozheng Zhang, Zhiqiang Wang, Changliang Xia. A Novel SVPWM Scheme for Field-Oriented Vector-Controlled PMSM Drive System Fed by Cascaded H-Bridge Inverter. IEEE Transactions on Power Electronics. 2021; 36 (8):8988-9000.
Chicago/Turabian StyleHuan Yao; Yan Yan; Tingna Shi; Guozheng Zhang; Zhiqiang Wang; Changliang Xia. 2021. "A Novel SVPWM Scheme for Field-Oriented Vector-Controlled PMSM Drive System Fed by Cascaded H-Bridge Inverter." IEEE Transactions on Power Electronics 36, no. 8: 8988-9000.
The switching frequency of high-power medium-voltage three-level inverters are relatively low due to the limitation of switching loss. Thus, the output performance of the inverter will be deteriorated if the fundamental frequency is increased (in other words, the pulse number is decreased). To solve the above issue, synchronized modulation strategies are necessary to be adopted to ensure the synchronization and symmetry of the output waveform. However, the output waveform of the inverter will be still rich in low order harmonics. In this paper, the amplitude of the average current ripple vector is introduced as the evaluation index of the output waveform quality. And output performances of different synchronized switching sequences (continuous switching sequence and discontinuous switching sequences) are calculated and compared quantitatively. On this basis, the optimal synchronized switching sequence for each specific pulse number is determined and an improved multi-mode synchronized modulation strategy for three-level inverters is proposed. Experimental results show that the harmonic distortion of the output waveform is effectively reduced by the proposed strategy.
Guozheng Zhang; Zhanqing Zhou; Tingna Shi; Changliang Xia. An Improved Multimode Synchronized Space Vector Modulation Strategy for High-Power Medium-Voltage Three-Level Inverter. IEEE Transactions on Power Electronics 2020, 36, 4686 -4696.
AMA StyleGuozheng Zhang, Zhanqing Zhou, Tingna Shi, Changliang Xia. An Improved Multimode Synchronized Space Vector Modulation Strategy for High-Power Medium-Voltage Three-Level Inverter. IEEE Transactions on Power Electronics. 2020; 36 (4):4686-4696.
Chicago/Turabian StyleGuozheng Zhang; Zhanqing Zhou; Tingna Shi; Changliang Xia. 2020. "An Improved Multimode Synchronized Space Vector Modulation Strategy for High-Power Medium-Voltage Three-Level Inverter." IEEE Transactions on Power Electronics 36, no. 4: 4686-4696.
The fast and stable inner current loop in the permanent magnet synchronous motor control system is the key factor that ensures the torque control performance of the motor. The deadbeat predictive current control has good dynamic response performance, but it depends heavily on the precise mathematical model of the controlled object. The parameter mismatch will degrade the control performance. A deadbeat predictive current control method based on online parameter identification is proposed in this study. This method does not need to inject additional d -axis current to identify the parameters during the operation of the motor; it only needs to make full use of the inherent phenomenon that the q -axis current changes when the load of the motor changes during operation, and perform parameter identification. Aiming at the problem that the effect of parameter identification is easily affected by motor speed, a new variable step-size neural network algorithm is designed in this study. The speed factor is introduced into step function to ensure the performance of the identification algorithm at a different speed. Finally, based on the new online parameter identification algorithm, the deadbeat predictive current control method is used to verify the experiment.
Zhiqiang Wang; Mingbo Yang; Le Gao; Zhixin Wang; Guozheng Zhang; Huimin Wang; Xin Gu. Deadbeat predictive current control of permanent magnet synchronous motor based on variable step‐size adaline neural network parameter identification. IET Electric Power Applications 2020, 14, 2007 -2015.
AMA StyleZhiqiang Wang, Mingbo Yang, Le Gao, Zhixin Wang, Guozheng Zhang, Huimin Wang, Xin Gu. Deadbeat predictive current control of permanent magnet synchronous motor based on variable step‐size adaline neural network parameter identification. IET Electric Power Applications. 2020; 14 (11):2007-2015.
Chicago/Turabian StyleZhiqiang Wang; Mingbo Yang; Le Gao; Zhixin Wang; Guozheng Zhang; Huimin Wang; Xin Gu. 2020. "Deadbeat predictive current control of permanent magnet synchronous motor based on variable step‐size adaline neural network parameter identification." IET Electric Power Applications 14, no. 11: 2007-2015.
Due to the large number of voltage vectors in the multilevel inverter, the traditional multilevel model predictive control has a problem of heavy online computing burden. In this study, a model predictive current control strategy for multilevel-cascaded H-bridge inverter-permanent-magnet synchronous motor (CHB-PMSM) system is proposed. By deeply analysing the relationship between current vector and increment of the voltage vector, the candidate voltage vector sets in dynamic and steady state are optimised. Besides, the number of candidate voltage vectors is reduced to two regardless of the levels of CHB inverter, avoiding all voltage vectors participating in the calculation. Consequently, the experimental results on the CHB-PMSM system verify that the proposed strategy can significantly reduce the computational complexity and make the motor system obtain good dynamic and steady-state performance.
Yan Yan; Fushun Liu; Tingna Shi; Guozheng Zhang; Zhiqiang Wang; Changliang Xia. Model predictive current control for multilevel CHB‐PMSM system with lower calculation. IET Electric Power Applications 2020, 14, 1089 -1096.
AMA StyleYan Yan, Fushun Liu, Tingna Shi, Guozheng Zhang, Zhiqiang Wang, Changliang Xia. Model predictive current control for multilevel CHB‐PMSM system with lower calculation. IET Electric Power Applications. 2020; 14 (6):1089-1096.
Chicago/Turabian StyleYan Yan; Fushun Liu; Tingna Shi; Guozheng Zhang; Zhiqiang Wang; Changliang Xia. 2020. "Model predictive current control for multilevel CHB‐PMSM system with lower calculation." IET Electric Power Applications 14, no. 6: 1089-1096.
Discontinuous pulse width modulation (DPWM) strategies are usually adopted to reduce the switching loss and output current ripple of three-phase three-level traction inverters under three-phase load conditions. However, if there is a short circuit in any arbitrary phase or the inverter is used to feed a two-phase load, the output performance of conventional DPWM strategies will be deteriorated. Here, four improved DPWM (IDPWM) strategies for three-phase three-level neutral-point-clamped (NPC) traction inverter fed two-phase load are proposed. Unlike three-phase load conditions, the phase angle and the amplitude of each basic voltage vector in the space vector diagram are modified under two-phase load conditions. Consequently, sectors are re-divided and duty cycles of basic vectors during synthesis are recalculated. Clamping intervals of each phase for the four type discontinuous PWM (DPWM) strategies are rearranged according to the modified space vector diagram; then, the proposed DPWM strategies can be obtained. Compared with the conventional DPWM strategies, the output current waveform quality of the proposed strategy is significantly improved. Meanwhile, the amplitude of the neutral-point voltage ripple is also reduced.
Guozheng Zhang; Yuwei Wan; Zhixin Wang; Le Gao; Zhanqing Zhou; Qiang Geng. Discontinuous Space Vector PWM Strategy for Three-Phase Three-Level Electric Vehicle Traction Inverter Fed Two-Phase Load. World Electric Vehicle Journal 2020, 11, 27 .
AMA StyleGuozheng Zhang, Yuwei Wan, Zhixin Wang, Le Gao, Zhanqing Zhou, Qiang Geng. Discontinuous Space Vector PWM Strategy for Three-Phase Three-Level Electric Vehicle Traction Inverter Fed Two-Phase Load. World Electric Vehicle Journal. 2020; 11 (1):27.
Chicago/Turabian StyleGuozheng Zhang; Yuwei Wan; Zhixin Wang; Le Gao; Zhanqing Zhou; Qiang Geng. 2020. "Discontinuous Space Vector PWM Strategy for Three-Phase Three-Level Electric Vehicle Traction Inverter Fed Two-Phase Load." World Electric Vehicle Journal 11, no. 1: 27.
For neutral point (NP)-clamped three-level inverter-fed permanent-magnet synchronous motor system, the tuning process of weighting factors in the cost function of conventional model-predictive torque control (MPTC) is complex. Also, large imbalance of NP potential can cause the deteriorated performance of flux and torque. To solve these problems, an improved MPTC is proposed. This algorithm first uses the deadbeat principle to unify the dimension of torque and flux. Then, the NP potential term in the conventional cost function can be eliminated by introducing the partition control of NP potential imbalance, which also eliminates the whole process of tuning weighting factors. After that, under the large NP potential imbalance, sectors are dynamically divided by modifying the magnitude and phase angle of medium and small vectors to improve the performance of torque and flux linkage. The experimental results show that compared with conventional MPTC, the improved MPTC can achieve fast suppression of NP potential imbalance with reducing the fluctuation of torque, flux linkage and current when NP potential imbalance is large.
Shihao Peng; Guozheng Zhang; Zhanqing Zhou; Xin Gu; Changliang Xia. MPTC of NP‐clamped three‐level inverter‐fed permanent‐magnet synchronous motor system for NP potential imbalance suppression. IET Electric Power Applications 2020, 14, 658 -667.
AMA StyleShihao Peng, Guozheng Zhang, Zhanqing Zhou, Xin Gu, Changliang Xia. MPTC of NP‐clamped three‐level inverter‐fed permanent‐magnet synchronous motor system for NP potential imbalance suppression. IET Electric Power Applications. 2020; 14 (4):658-667.
Chicago/Turabian StyleShihao Peng; Guozheng Zhang; Zhanqing Zhou; Xin Gu; Changliang Xia. 2020. "MPTC of NP‐clamped three‐level inverter‐fed permanent‐magnet synchronous motor system for NP potential imbalance suppression." IET Electric Power Applications 14, no. 4: 658-667.
Huimin Wang; Chongyuan Li; Guozheng Zhang; Qiang Geng; Tingna Shi. Maximum Torque Per Ampere (MTPA) Control of IPMSM Systems Based on Controller Parameters Self-Modification. IEEE Transactions on Vehicular Technology 2020, 69, 2613 -2620.
AMA StyleHuimin Wang, Chongyuan Li, Guozheng Zhang, Qiang Geng, Tingna Shi. Maximum Torque Per Ampere (MTPA) Control of IPMSM Systems Based on Controller Parameters Self-Modification. IEEE Transactions on Vehicular Technology. 2020; 69 (3):2613-2620.
Chicago/Turabian StyleHuimin Wang; Chongyuan Li; Guozheng Zhang; Qiang Geng; Tingna Shi. 2020. "Maximum Torque Per Ampere (MTPA) Control of IPMSM Systems Based on Controller Parameters Self-Modification." IEEE Transactions on Vehicular Technology 69, no. 3: 2613-2620.
The model predictive torque control (MPTC) is an effective strategy for high performance motor systems. The strategy obtains the optimal voltage vector more quickly and accurately compared with the traditional direct torque control. However, some problems of the strategy are needed to be solved, such as few active vectors, difficult cost function design, and hard duty cycle regulation and so on. An improved MPTC is put forward for these problems in this study. The number of the vector is increased by constructing virtual vectors in the improved method. The finite control set under the rotating coordinate system based on the stator flux orientation is established to select the vector and reduce the computation load. The evaluation mechanism of the selected vector is set by combined with the duty cycle method, so the weight factor of cost function in the traditional method is eliminated. And the duty cycle can play a full role in the adjustment. The prototype experiment system is built for verifying the proposed method. The results demonstrate that the proposed method has better torque and flux control performances and effectively improve the above problems in the traditional method.
Xin Gu; Pan Shen; Xinmin Li; Guozheng Zhang; Zhiqiang Wang; Tingna Shi. Improved vector selection based model predictive torque control for IPMSM. IET Electric Power Applications 2019, 14, 139 -146.
AMA StyleXin Gu, Pan Shen, Xinmin Li, Guozheng Zhang, Zhiqiang Wang, Tingna Shi. Improved vector selection based model predictive torque control for IPMSM. IET Electric Power Applications. 2019; 14 (1):139-146.
Chicago/Turabian StyleXin Gu; Pan Shen; Xinmin Li; Guozheng Zhang; Zhiqiang Wang; Tingna Shi. 2019. "Improved vector selection based model predictive torque control for IPMSM." IET Electric Power Applications 14, no. 1: 139-146.
Aimed at reducing the switching loss and common-mode voltage amplitude of high-power medium-voltage three-level inverter under low modulation index conditions, an improved synchronous space vector PWM strategy is proposed in this paper. The switching times in each fundamental period are reduced by the re-division of small regions and the full use of the redundant switching state. The sum of switching algebra is introduced as an evaluation index and the switching state with the minimum value of the sum of switching algebra are adopted. Then, the common mode voltage amplitude is reduced. The theoretical analysis and experimental results show that the improved modulation strategy proposed in this paper can effectively reduce the switching loss and common-mode voltage amplitude of the inverter under the condition of the low modulation index. Moreover, the neutral-point voltage ripple is also reduced simultaneously.
Xin Gu; Bingxu Wei; Guozheng Zhang; Zhiqiang Wang; Wei Chen; Gu; Wei; Wang; Chen. Improved Synchronized Space Vector PWM Strategy for Three-Level Inverter at Low Modulation Index. Electronics 2019, 8, 1400 .
AMA StyleXin Gu, Bingxu Wei, Guozheng Zhang, Zhiqiang Wang, Wei Chen, Gu, Wei, Wang, Chen. Improved Synchronized Space Vector PWM Strategy for Three-Level Inverter at Low Modulation Index. Electronics. 2019; 8 (12):1400.
Chicago/Turabian StyleXin Gu; Bingxu Wei; Guozheng Zhang; Zhiqiang Wang; Wei Chen; Gu; Wei; Wang; Chen. 2019. "Improved Synchronized Space Vector PWM Strategy for Three-Level Inverter at Low Modulation Index." Electronics 8, no. 12: 1400.
Interior permanent magnet synchronous motors (IPMSMs) are usually used in electric vehicle drives and in other applications. In order to enlarge the speed range of IPMSMs, the flux-weakening control method is adopted. The traditional flux-weakening control strategy degrades the control performance because of parameter mismatches caused by variation of motor parameters. An improved uncertainty and disturbance estimator (UDE)-based flux-weakening control strategy is proposed for IPMSM drives in this paper. The parameter tuning method in the UDE-based control is improved. In addition, a flux-weakening adjusting factor is put forward to reduce the torque fluctuation when the operation point switches between the constant torque region and the flux-weakening region. This factor can be adjusted online by a lookup table. Finally, the validity of proposed method is verified by the simulation and experimental results. The results show that the proposed control strategy can effectively enhance the robustness of the system in the flux-weakening region, and make the system switch more smoothly between the constant torque region and the flux-weakening region.
Xin Gu; Tao Li; Xinmin Li; Guozheng Zhang; Zhiqiang Wang; Li; Gu; Wang. An Improved UDE-Based Flux-Weakening Control Strategy for IPMSM. Energies 2019, 12, 4077 .
AMA StyleXin Gu, Tao Li, Xinmin Li, Guozheng Zhang, Zhiqiang Wang, Li, Gu, Wang. An Improved UDE-Based Flux-Weakening Control Strategy for IPMSM. Energies. 2019; 12 (21):4077.
Chicago/Turabian StyleXin Gu; Tao Li; Xinmin Li; Guozheng Zhang; Zhiqiang Wang; Li; Gu; Wang. 2019. "An Improved UDE-Based Flux-Weakening Control Strategy for IPMSM." Energies 12, no. 21: 4077.
An improved direct torque control with space-vector modulation (DTC-SVM) scheme is presented in this paper. In the conventional DTC-SVM scheme, torque control performance is affected by the load conditions, due to the inappropriate linearization of the relationship between the flux angle and electromagnetic torque. Different from the conventional method, a torque controller with load angle estimation (TC-LAE) is proposed and the change rate of torque is regulated according to the variation of the load conditions, which could ensure the rapidity and consistency of torque performance at different load conditions. Meanwhile, an online permanent magnet synchronous motor and maximum torque per ampere (PMSM-MTPA) operation strategy based on the fitting solving method is proposed instead of the traditional two-dimensional look-up table, and the reference value of flux amplitude is calculated online to meet the MTPA requirement with the proposed method. The improved strategy is applied on a 6 kW PMSM, and the simulation and experimental results verified the effectiveness and the feasibility of the proposed strategy.
Zhanqing Zhou; Xin Gu; Zhiqiang Wang; Guozheng Zhang; Qiang Geng; Zhou; Gu; Wang; Geng. An Improved Torque Control Strategy of PMSM Drive Considering On-Line MTPA Operation. Energies 2019, 12, 2951 .
AMA StyleZhanqing Zhou, Xin Gu, Zhiqiang Wang, Guozheng Zhang, Qiang Geng, Zhou, Gu, Wang, Geng. An Improved Torque Control Strategy of PMSM Drive Considering On-Line MTPA Operation. Energies. 2019; 12 (15):2951.
Chicago/Turabian StyleZhanqing Zhou; Xin Gu; Zhiqiang Wang; Guozheng Zhang; Qiang Geng; Zhou; Gu; Wang; Geng. 2019. "An Improved Torque Control Strategy of PMSM Drive Considering On-Line MTPA Operation." Energies 12, no. 15: 2951.
This paper presents a sector subdivision based space vector pulse width modulation (SVPWM) strategy with reduced current ripple for a three-level inverter. Using the output current ripple theory, closed-form expressions of average current ripple vectors for both continuous and discontinuous switching sequences are derived. Based on the sector and triangle distributions of conventional SVPWM strategy, each triangle is further divided into three small-regions. Then the switching sequence with the lowest magnitude of the average current ripple vector is applied in every small-region, so that the advantages of continuous pulse width modulation (CPWM) and discontinuous pulse width modulation (DPWM) under different modulation index conditions are combined to reduce the current ripple in the whole modulation range. The output performance of the proposed strategy is compared with the conventional CPWM and DPWM strategy, and experimental results verify that the proposed strategy could reduce the current ripple of three-level inverters effectively.
Guozheng Zhang; Bingxu Wei; Xin Gu; Xinmin Li; Zhanqing Zhou; Wei Chen. Sector Subdivision Based SVPWM Strategy of Neutral-Point-Clamped Three-Level Inverter for Current Ripple Reduction. Energies 2019, 12, 2734 .
AMA StyleGuozheng Zhang, Bingxu Wei, Xin Gu, Xinmin Li, Zhanqing Zhou, Wei Chen. Sector Subdivision Based SVPWM Strategy of Neutral-Point-Clamped Three-Level Inverter for Current Ripple Reduction. Energies. 2019; 12 (14):2734.
Chicago/Turabian StyleGuozheng Zhang; Bingxu Wei; Xin Gu; Xinmin Li; Zhanqing Zhou; Wei Chen. 2019. "Sector Subdivision Based SVPWM Strategy of Neutral-Point-Clamped Three-Level Inverter for Current Ripple Reduction." Energies 12, no. 14: 2734.
In conventional model predictive control, the dimensions of the control variables are different from each other, which makes adjusting the weighted factors in the cost function complicated. This issue can be solved by adopting the model predictive flux control. However, the performance of the electromagnetic torque is affected by the change of the cost function. A novel model predictive torque control of the interior permanent magnet synchronous motor is presented in this paper, and the cost function involving the excitation torque and reluctance torque is established. Combined with the model predictive flux control and discrete space vector modulation, the current ripple and torque ripple are reduced. The performance of torque under an overload condition is superior to model predictive flux control. The effectiveness of the proposed algorithm is verified by the simulation and experimental results.
Guozheng Zhang; Chen Chen; Xin Gu; Zhiqiang Wang; Xinmin Li. An Improved Model Predictive Torque Control for a Two-Level Inverter Fed Interior Permanent Magnet Synchronous Motor. Electronics 2019, 8, 769 .
AMA StyleGuozheng Zhang, Chen Chen, Xin Gu, Zhiqiang Wang, Xinmin Li. An Improved Model Predictive Torque Control for a Two-Level Inverter Fed Interior Permanent Magnet Synchronous Motor. Electronics. 2019; 8 (7):769.
Chicago/Turabian StyleGuozheng Zhang; Chen Chen; Xin Gu; Zhiqiang Wang; Xinmin Li. 2019. "An Improved Model Predictive Torque Control for a Two-Level Inverter Fed Interior Permanent Magnet Synchronous Motor." Electronics 8, no. 7: 769.
This paper presents a commutation torque ripple suppression strategy for brushless DC motor (BLDCM) in the high-speed region, which considers the back electromotive force (back-EMF) variation during the commutation process. In the paper, the influence of actual back-EMF variation on the torque and outgoing phase current during the commutation process is analyzed. A modified smooth torque mechanism is then reconstructed considering the back-EMF variation, based on which a novel torque ripple suppression strategy is further designed. Compared with the traditional strategy which controls the chopping duty cycle relatively smoothly in the commutation process, the proposed strategy dynamically regulates the chopping duty cycle, which makes it show a gradual decrease. This strategy can suppress the commutation torque ripple even in a long commutation process, and broaden the speed range of the commutation torque ripple reduction. Under the experimental conditions of this paper, the proposed strategy can effectively reduce the commutation torque ripple in the high-speed region, and avoid the outgoing phase current cannot be reduced to zero. The experimental results verify the correctness of the theoretical analysis and the feasibility of the proposed strategy.
Xinmin Li; Guokai Jiang; Wei Chen; Tingna Shi; Guozheng Zhang; Qiang Geng. Commutation Torque Ripple Suppression Strategy of Brushless DC Motor Considering Back Electromotive Force Variation. Energies 2019, 12, 1932 .
AMA StyleXinmin Li, Guokai Jiang, Wei Chen, Tingna Shi, Guozheng Zhang, Qiang Geng. Commutation Torque Ripple Suppression Strategy of Brushless DC Motor Considering Back Electromotive Force Variation. Energies. 2019; 12 (10):1932.
Chicago/Turabian StyleXinmin Li; Guokai Jiang; Wei Chen; Tingna Shi; Guozheng Zhang; Qiang Geng. 2019. "Commutation Torque Ripple Suppression Strategy of Brushless DC Motor Considering Back Electromotive Force Variation." Energies 12, no. 10: 1932.
As the computation delays between the reference torques and the load torques, the speed and position synchronous errors of the multimotor drive system employed traditional electronic line shafting (ELS) control would become significant during the process of large load disturbances. Therefore, an improved ELS control strategy is proposed in this paper. In this strategy, the load torques observed by the sliding model observers are fed back to the virtual motor directly, so as to shorten the adjusting time and improve the antidisturbance performance of entire control system. Meanwhile, to reduce the chattering of the sliding mode observer, a novel exponential reaching law is designed in this paper. The experimental results show that the improved ELS control strategy could reduce the speed and position synchronous errors effectively.
Qiang Geng; Wei Liu; Huimin Wang; Zhanqing Zhou; Guozheng Zhang. An Improved Electronic Line Shafting Control for Multimotor Drive System Based on Sliding Mode Observer. Mathematical Problems in Engineering 2019, 2019, 1 -13.
AMA StyleQiang Geng, Wei Liu, Huimin Wang, Zhanqing Zhou, Guozheng Zhang. An Improved Electronic Line Shafting Control for Multimotor Drive System Based on Sliding Mode Observer. Mathematical Problems in Engineering. 2019; 2019 ():1-13.
Chicago/Turabian StyleQiang Geng; Wei Liu; Huimin Wang; Zhanqing Zhou; Guozheng Zhang. 2019. "An Improved Electronic Line Shafting Control for Multimotor Drive System Based on Sliding Mode Observer." Mathematical Problems in Engineering 2019, no. : 1-13.
The fast and stable current inner loop in the permanent magnet synchronous motor(PMSM) control system is the key factor that ensure the torque control performance of the motor. The deadbeat model predictive control strategy can achieve fast dynamic response, but it depended on the accurate mathematical model of the motor. When the model parameter in predictive controller has mismatched with real system, the static error or oscillations will occur in the steady state. Therefore, a novel current predictive control based on fuzzy algorithm is proposed in this paper. The novel control strategy contained a predictive controller, a proportional integral compensation link, a magnetic flux observer and a fuzzy controller. According to the operation state of the motor and the model parameter mismatch of the controller, the fuzzy algorithm can adjust the effect of compensation link by weight coefficient in real time. The dynamic performance of the proposed method is guaranteed compared with the traditional deadbeat predictive current control based on SVPWM. When the model parameter mismatch of controller is occurred, the weight of the proportional integral compensation link is enhanced, and the static error or oscillation of the motor system can be eliminated.
Zhiqiang Wang; Anbo Yu; Xinmin Li; Guozheng Zhang; Changliang Xia. A Novel Current Predictive Control Based on Fuzzy Algorithm for PMSM. IEEE Journal of Emerging and Selected Topics in Power Electronics 2019, 7, 990 -1001.
AMA StyleZhiqiang Wang, Anbo Yu, Xinmin Li, Guozheng Zhang, Changliang Xia. A Novel Current Predictive Control Based on Fuzzy Algorithm for PMSM. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2019; 7 (2):990-1001.
Chicago/Turabian StyleZhiqiang Wang; Anbo Yu; Xinmin Li; Guozheng Zhang; Changliang Xia. 2019. "A Novel Current Predictive Control Based on Fuzzy Algorithm for PMSM." IEEE Journal of Emerging and Selected Topics in Power Electronics 7, no. 2: 990-1001.
Duty cycle model predictive torque control (Duty-MPTC) only uses zero vector as the second vector to form vector combinations, which restricts its torque control performance. This paper proposes a modified double vectors model predictive torque control (DVMPTC) by reasonably selecting active vector instead of zero vector. By analyzing the regulation of torque and flux of permanent magnet synchronous motor (PMSM), the torque and flux difference parameters are obtained, and then a second vector selection table is established to determine the best vector combination for torque ripple suppression. And based on the torque and flux difference parameters, the duty cycle calculation method is proposed to reduce the calculation burden of the control system. In order to verify the effectiveness of the proposed method, experiments with a 6-kW PMSM are carried out. Compared to Duty-MPTC, the proposed DVMPTC method can significantly reduce the torque ripples with good dynamic performance and relatively low average switching frequency.
Wei Chen; Sike Zeng; Guozheng Zhang; Tingna Shi; Changliang Xia. A Modified Double Vectors Model Predictive Torque Control of Permanent Magnet Synchronous Motor. IEEE Transactions on Power Electronics 2019, 34, 11419 -11428.
AMA StyleWei Chen, Sike Zeng, Guozheng Zhang, Tingna Shi, Changliang Xia. A Modified Double Vectors Model Predictive Torque Control of Permanent Magnet Synchronous Motor. IEEE Transactions on Power Electronics. 2019; 34 (11):11419-11428.
Chicago/Turabian StyleWei Chen; Sike Zeng; Guozheng Zhang; Tingna Shi; Changliang Xia. 2019. "A Modified Double Vectors Model Predictive Torque Control of Permanent Magnet Synchronous Motor." IEEE Transactions on Power Electronics 34, no. 11: 11419-11428.
In order to meet the high performance and efficiency requirements, a new space vector based discontinuous modulation strategy for neutral-point clamped (NPC) three-level inverter is presented in this paper. Different from the conventional discontinuous PWM (DPWM) strategies, a new clamping state is applied to synthesize the reference voltage under the condition of low modulation index. The rms value of output current ripple for different clamping states are calculated, and then the distribution of the new clamping state and the other two clamping states adopted in conventional DPWMs is optimized based on the calculation results. The switching sequences are redesigned according to the new distribution of the three clamping states. The output voltage and current, switching loss, neutral-point voltage ripple and the common mode voltage of the proposed DPWM strategy and DPWM0~DPWM3 are compared by simulation and experimental results. The results show that by the use of the proposed strategy, the values of total demand distortion of output current (ITDD) and weighted total harmonic distortion of output voltage (VWTHD) are the lowest. Furthermore, the product of switching loss and ITDD of the proposed strategy maintains the lowest within a large range of modulation index-load angle plane. It can be concluded that the utilization of the new clamping state and optimal distribution of different clamping states could enhance the output performance of the inverter. Moreover, the high efficiency requirement can also be realized at the same time.
Changliang Xia; Guozheng Zhang; Yan Yan; Xin Gu; Tingna Shi; Xiangning He. Discontinuous Space Vector PWM Strategy of Neutral-Point-Clamped Three-Level Inverters for Output Current Ripple Reduction. IEEE Transactions on Power Electronics 2016, 32, 5109 -5121.
AMA StyleChangliang Xia, Guozheng Zhang, Yan Yan, Xin Gu, Tingna Shi, Xiangning He. Discontinuous Space Vector PWM Strategy of Neutral-Point-Clamped Three-Level Inverters for Output Current Ripple Reduction. IEEE Transactions on Power Electronics. 2016; 32 (7):5109-5121.
Chicago/Turabian StyleChangliang Xia; Guozheng Zhang; Yan Yan; Xin Gu; Tingna Shi; Xiangning He. 2016. "Discontinuous Space Vector PWM Strategy of Neutral-Point-Clamped Three-Level Inverters for Output Current Ripple Reduction." IEEE Transactions on Power Electronics 32, no. 7: 5109-5121.