Asymmetric six-level rectifier and control method thereof
A control method and rectifier technology, which are applied to electrical components, conversion devices for converting AC power input to DC power output, and output power, etc. Simple, scalable and practical effect
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Embodiment 1
[0039] The purpose of this embodiment is to provide an asymmetric six-level rectifier.
[0040] Such as figure 1 As shown, an asymmetric six-level rectifier includes three-phase bridge arms connected in parallel, and each phase bridge arm includes an H-bridge circuit, a diode and an IGBT tube; the H-bridge circuit outputs three levels, and the diode and the IGBT tube and the The DC side capacitor cooperates to output two levels, and the two parts are cascaded to output six levels;
[0041] The controller of the six-level rectifier determines the six-level space vector diagram based on the pre-built six-level switch state, and realizes the six-level harmonic-free output; at the same time, using the value function constructed based on the space vector diagram, Realize grid-connected current tracking and three-phase floating capacitor voltage equalization.
[0042] Further, each phase of the H-bridge circuit is connected in parallel with a floating capacitor.
[0043] Further,...
Embodiment 2
[0053] The purpose of this embodiment is to provide a control method for an asymmetric six-level rectifier.
[0054] A control method for an asymmetric six-level rectifier, which utilizes the above-mentioned asymmetric six-level rectifier, the control method comprising:
[0055] Obtain the three-phase sampling current, and obtain the current in the two-phase stationary coordinate system through Clark transformation;
[0056] Carry out coordinate transformation on the sampling voltage on the three-phase network side to obtain the voltage value in the two-phase stationary coordinate system;
[0057] Based on the obtained current in the two-phase stationary coordinate system and the Lagrange extrapolation method, the current at the next moment is obtained; and based on the voltage value in the two-phase stationary coordinate system and the discretized predictive control model, the next moment is obtained The reference voltage value of , based on the value function of minimizing ...
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