Space vector pulse width modulation controller of tri-level circuit and control method thereof
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A space vector pulse width and space vector technology, applied in the direction of AC motor control, control system, electrical components, etc., can solve the problems of unfavorable software programming, increased design cost, long calculation time, etc.
Inactive Publication Date: 2010-03-10
SHENZHEN POLYTECHNIC
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In these cases, the calculation formula of the switching vector action time derived from the above formula (II) is different, and the calculation is very complicated
[0017]In short, the calculation of the above vector control method is very compli
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[0054] The invention provides a control method of a space vector pulse width modulation (SVPWM) controller of a three-level circuit, and its process is as follows:
[0055] First, establish the switch space vector plane diagram of each switch working state in the rectification or inverter circuit, and use the ray from the center of the switch space vector plane diagram to divide the space vector plane diagram into 12 right triangles;
[0056] Then, according to the phase angle of the space vector corresponding to the given amount, in the space vector plan view, find the right-angled triangle area where the space vector corresponding to the given amount is located, and use the switch vectors corresponding to the vertices of the right-angled triangle area as constants to establish the given Quantitative space vector and the vector synthesis mathematical model of each switch operating time, the vertex switch vector of the right-angled triangle area here includes: the zero vector p...
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Abstract
The invention discloses a space vector pulse width modulation (PMW) controller of a tri-level circuit and a control method thereof. The controller comprises a searching module and a computation module, wherein, the searching module is used for searching the right triangle area in which the space vector corresponding to given value is located in a space vector plane figure according to the phase angle of the space vector corresponding to the given value, and takes switch vectors corresponding to each vertex of the right triangle area as constants to establish a composite vector mathematical model of the space vector of the given value and the work time of each switch; and the computation module is used for inputting acquired voltage and current input to the composite vector mathematical model, computing the work time of each switch in the circuit, and outputting the work time to an execution unit (EU). In the invention, the control algorithm of space vector PMW is simplified, and the programming cost and the hardware cost are reduced.
Description
technical field [0001] The invention relates to a space vector pulse width modulation (SVPWM) control method, in particular to a vector controller and a control method thereof. Background technique [0002] Generally, the topology of a three-phase three-level PFC (power factor correction) circuit is as follows figure 1 As shown, among them, a, b, c are three-phase AC voltage input, P, N are DC output, O point is the midpoint of output capacitor C01, C02; La, Lb, Lc are three inductors; S1, S2 , S3 is a number of power electronic devices (MOSFET, IGBT, etc.) and their additional circuits, which play the role of high-frequency switches and are called switching tubes; D1, D2, D3, D4, D5, and D6 are 6 diodes. figure 1 The circuit shown converts the three-phase AC voltage input from the terminals a, b, and c into the DC voltage output from the PN terminal through vector control, which is used to provide the DC bus voltage. [0003] figure 1 The different states of the three sw...
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