A five-level neutral-point capacitor voltage control method based on amplitude-shifted carrier
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A capacitor voltage, five-level technology, applied in the field of power electronics and power transmission, to achieve the effects of strong robustness, stable voltage control, and simple division
Active Publication Date: 2019-01-08
NORTHEASTERN UNIV
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However, as the number of levels increases, Space Vector Pulse Width Modulation (SVPWM) will greatly increase the redundant vector of the switch sequence; in addition, it is difficult to divide the space power area in the traditional control method, and using SVPWM will Makes the calculation vector calculation time quite complicated, and the capacitor balance algorithm is even more complicated
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Embodiment ( 1
[0048] Such as figure 1 As shown, this implementation provides a control method of the ANPC five-level midpoint capacitor voltage based on the amplitude-shifted carrier SWPM, such as figure 2 As shown, the three-phase voltage vector is used as input, and the specific steps include:
[0049] 101. Perform per-unit processing on the input three-phase voltage vector to obtain the equivalent A-phase modulation vector u a , B-phase modulation vector u b , C-phase modulation vector u c , divide -1 to 1 into four consecutive equal intervals; among them, the base value of per-unit processing is V d is a five-level bus voltage.
[0050] For example, if image 3 As shown, the phase A modulation vector u a , B-phase modulation vector u b and C-phase modulation vector u c The amplitudes of all are 1; B-phase modulation vector u b The phase lag of phase A modulation vector u a The phase of 120°, C-phase modulation vector u c The phase of A phase ahead of the modulation vector ...
Embodiment ( 2
[0075] In this embodiment, the five-level midpoint capacitor voltage is preset to be 270V, and the solution of the first embodiment is used to control the five-level midpoint capacitor voltage, and the value of the five-level midpoint capacitor voltage is collected and analyzed;
[0076] Specifically, for example, as Figure 7 As shown, the five-level midpoint capacitor voltage collected in this embodiment is set to 270V, and the maximum error is 0.7V. It can be seen that the five-level midpoint capacitor voltage controlled by the method of the present invention is stable.
[0077] The method of the invention has the advantages of simple division of space vector regions, small amount of calculation, short calculation time, stable voltage control to ensure the stability of power electronic equipment in the whole range, and has the characteristics of strong robustness.
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Abstract
The invention relates to a five-level neutral point capacitance voltage control method based on amplitude shifting carrier. Includes such steps as scaling the input three-phase voltage vector to obtain equivalent three-phase modulation vectors uaub, uc and four intervals, scaling the input three-phase voltage vector to obtain equivalent three-phase modulation vectors uaub, uc and four intervals; 102, collect a five-level neutral point capacitor voltage un, and comparing that un with half of the bus voltage to obtain a variable N; 103, respectively obtain a three-phase modulation vector ua, uband uc instantaneous values Va, Between Vb and Vc and sum, Minimum lower boundary difference shown in the description and shown in the description; 104, obtaining the corrected three-phase voltage according to the variable N and the minimum difference between the upper and lower boundaries; 105, generating a three-phase PWM signal according to the corrected three-phase voltage to control the five-level inverter to keep the five-level neutral point capacitor voltage un stable; The invention has the advantages of simple space vector region division, small calculation amount, short calculation time, stable voltage control to ensure the stability of the power electronic equipment in the whole range, and strong robustness.
Description
technical field [0001] The invention belongs to the field of power electronics and electric transmission, and in particular relates to a five-level midpoint capacitor voltage control method based on an amplitude-shifting carrier. Background technique [0002] Recently, multi-level modulation technology is widely used in high-power occasions. Multi-level inverters will make the output current more sinusoidal, with low harmonic content and low switching loss. However, as the number of levels increases, Space Vector Pulse Width Modulation (SVPWM) will greatly increase the redundant vector of the switch sequence; in addition, it is difficult to divide the space power area in the traditional control method, and using SVPWM will This makes the calculation time of the vector calculation quite complicated, and the capacitance balancing algorithm is even more complicated. Contents of the invention Contents of the invention [0003] (1) Technical problems to be solved [0004]...
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