ANPC five-level inverter and model prediction control method thereof

Abstract

The invention discloses an ANPC five-level inverter and a model prediction control method thereof. The inverter includes three phases of bridge arms connected in parallel. Each phase of bridge arm includes eight IGBTs. Four IGBTs connected in series are connected with positive, negative and neutral points of a direct current bus, and the other four IGBTs connected in series are connected to outputof IGBT tubes one and three. An input end of each bridge arm is connected with a direct current voltage source. According to the ANPC five-level inverter and the model prediction control method thereof, novel model prediction control does not need to adjust PI parameters and positive and negative sequence separation as compared with traditional PI control methods, control is simple, the amount ofcalculation is greatly reduced, DSP realization is facilitated, a zero common mode voltage vector is selected for the leakage current problem existing in five-level photovoltaic grid-connected inverters, leakage currents can be completely eliminated, a redundant switch is selected for the neutral point potential imbalance problem existing in five-level ANPC inverters, neutral point potential balance control is realized, and flying capacitor equality control is realized. The inverter and the method can be applied to the field of renewable energy power generation such as photovoltaic power generation systems.

Description

technical field [0001] The invention relates to the technical field of inverters, in particular to an ANPC five-level inverter and a model predictive control method thereof. Background technique [0002] Compared with the traditional two-level inverter, the five-level inverter has the advantages of small switching loss and good output grid-connected waveform quality, and is widely used in photovoltaic power generation systems. Among them, the five-level active clamp inverter is the most widely used five-level inverter topology due to its simple control. Moreover, as a large number of photovoltaic power generation is connected to the grid, the requirements for grid-connected waveforms are gradually increasing. The five-level active clamp inverter has become the new favorite of photovoltaic power generation systems due to its advantages of good waveform quality. However, the grid-connected control of five-level active-clamp inverters needs to adjust a large number of PI param...

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Problems solved by technology

[0005] The ANPC five-level inverter will have unequal flying capacitors. The traditional method is to send it into the value function. This method also needs to adjust the weight coefficient, and it is coupled with the midpoint potential unbalance control, and the parameters are difficult. regulation, it is necessary to propose a new model predictive control method to realize the flying capacitor control

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