Abstract
Active power filter can compensate harmonic and reactive power, Three level neutral point clamp (ANPC) has the characteristics of low output harmonic and low device loss. The control of three-level active power filter needs to consider multiple objectives. Finite control set model predictive control (FCS-MPC) is a new method which can add constraints and multi-objective control. According to the limit of the switch state, it can track the reference current, which has the characteristics of fast dynamic response and good compensation effect. This method not only keeps the neutral point voltage balance, but also solves the problem of unstable switching frequency.
Highlights
The use of power electronics and the integration of new energy will cause a lot of harmonic pollution and reduce the quality of power grid
Literature [2] proposed a three-level APF sliding model control, which is a traditional nonlinear control method that can stably control the harmonic content of the power grid, but the calculation is large, and the control has the problem of delay
The term of balancing capacitor voltage is added to distribute the weight factor, so as to synthesize all the reference tracking values, select the switch state with the minimum value function, output to APF, and cycle in the future. This way can track the harmonic current in real time without pulse width modulation (PWM)
Summary
The use of power electronics and the integration of new energy will cause a lot of harmonic pollution and reduce the quality of power grid. APF can reduce the harmonic content, and compensate the reactive power It can effectively improve the power quality and improve the security of the distribution network. The three-level APF, because of its special structure, can output more vector combinations, and because it is a harmonic source, its special structure makes its impact on the power grid lower [1, 2]. Literature [2] proposed a three-level APF sliding model control, which is a traditional nonlinear control method that can stably control the harmonic content of the power grid, but the calculation is large, and the control has the problem of delay. The FCS-MPC of the three-level APF studied in this paper has a clear physical meaning and is easy to understand It is improved from the traditional MPC to the field of converter control. The APF DC side capacitor voltage adopts PI control, and the weight coefficient control is added to the three-level two capacitor voltage balance
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