Five-phase inverter model predictive control method and system based on virtual voltage vector
A technology of model predictive control and five-phase inverter, applied in vector control system, control system, motor generator control and other directions, can solve the problems of reducing the calculation amount of the model predictive control method and the large amount of calculation of the model predictive control method. , to reduce the computational burden, have strong adaptability, and eliminate low-order harmonic currents
Active Publication Date: 2022-03-25
CHENGDU YUNDA TECH CO LTD
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[0005] In order to solve the problem that the existing five-phase voltage source inverter model predictive control method has a large amount of calculation, the purpose of the present invention is to provide a five-phase inverter model predictive control method and system based on virtual voltage vector, which can reduce the model While predicting the calculation amount of the control method, it not only ensures the dynamic and static performance of the current, but also effectively eliminates the low-order harmonic current
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[0044] In the five-phase inverter system, according to the coordinate transformation, the symmetrical physical quantities (voltage, current, etc.) in the natural coordinate system can be mapped to two orthogonal subspaces of α-β and x-y respectively. The fundamental wave and 10j±1 (j=1,2,3...) harmonics of physical quantities are mapped to the α-β subspace through the first two rows of the transformation matrix T. The 3rd and 10j±3 (j=1,2,3...) harmonics in the physical quantity are mapped to the x-y subspace through the 3rd and 4th rows of the transformation matrix T, and the transformation matrix T is as follows:
[0045]
[0046] Wherein, α=2π / 5.
[0047] figure 1 Shown is a five-phase voltage source inverter with resistive inductive load, S i (i=a, b, c, d, e) sequentially represent the switching states of each bridge arm of the inverter. When the upper bridge arm is turned on, Si =1; when the lower bridge arm is turned on, S i =0, and the upper bridge arm and the lo...
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The present invention discloses a five-phase inverter model predictive control method and system based on a virtual voltage vector. The key point of the technical solution is: to synthesize ten large vectors and ten medium vectors output by the five-phase inverter into α- The virtual voltage vector under the β subspace; according to the optimal vector of the kth control period, two virtual vectors adjacent to the optimal vector, the zero vector and the virtual vector opposite to the optimal vector, the k+1th control Periodic dynamic control set; calculate the evaluation function value of the dynamic control set according to the simplified evaluation function, and select the voltage vector with the smallest evaluation function value from the dynamic control set as the optimal vector corresponding to the control cycle; if the optimal vector is a virtual voltage vector , then a symmetric switching sequence output is generated. The dynamic control set constructed by the present invention includes five voltage vectors, and the optimal vector can be determined only by five optimization calculations in each control cycle, the calculation complexity is low, and it is easy to implement digitally.
Description
technical field [0001] The invention relates to the technical field of power electronics and electric drive control, more specifically, it relates to a five-phase inverter model predictive control method and system based on a virtual voltage vector. Background technique [0002] At present, model predictive control has received extensive attention in the field of motor control. Among them, finite control set model predictive current control (FCS-MPCC) has simple structure, fast dynamic response, and easy handling of system constraints. It has become a research hotspot of model predictive control in the field of motor control. At the same time, in recent years, the multi-phase motor variable frequency drive system has become a popular choice in the field of motor control due to its advantages of providing greater power in places where the voltage is limited, and has the advantages of small torque ripple, high operating efficiency, good fault tolerance, and high reliability. ...
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IPC IPC(8): H02P21/14H02P21/22H02P27/06H02J3/01H02M7/483
CPCH02P21/14H02P21/22H02P27/06H02J3/01H02M7/483Y02E40/40
Inventor 何鸿云宋文胜刘川余彬李婷婷李建新崔恒斌冯晓云
Owner CHENGDU YUNDA TECH CO LTD