Non-isolation type three-phase three-level V2G charge-discharge topological structure and control method therefor
A topology, three-level technology, used in battery circuit devices, current collectors, electric vehicles, etc., can solve the problems of large common-mode voltage, difficult to find, etc., to suppress spikes, reduce switching times, and ensure The effect of the energy bidirectional flow characteristic
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[0047] The logical relationship of the control strategy is as follows Figure 5 shown. The details are as follows: Let the electromotive force of the three-phase grid be e a ,e b ,e c , connected to the connection of the upper and lower arms of each phase bridge arm through the three-phase linear inductance L, the currents of the three-phase grid side are respectively i a ,i b ,i c , the AC / DC part adopts the double closed-loop control structure of the voltage outer loop and the current inner loop, the reference voltage vector signal is obtained through the double closed loop, and sent to the SVPWM control module to generate twelve control pulses, which are sent to the AC / DC part twelve switch tube, the control strategy of the present invention proposes at the SVPWM control module (see Figure 5 The SVPWM signal generation module in).
[0048] from Image 6 It can be seen that the ordered letter combination composed of P, O and N represents 27 groups of switch states, ...
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