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The resonant stability problems of LCL filter have become big challenges for grid-connected inverter in weak grid. This paper takes the effect of non-minimum phase time delay on the ratio between resonance frequency and sampling frequency into account and use it to design the LCL filter. Both LCL resonance frequency and inverter-side inductor and filter capacitor related L1C resonance frequency are...
Hysteresis model predictive control (HMPC) is a variant of finite-control-set model predictive control, which is mainly developed for high-power applications. In this paper, the HMPC scheme is proposed to control a high-power grid-connected two-level voltage source inverter with an inductive-capacitive-inductive (LCL) filter. To ensure the stable operation of the control system, the resonance characteristics...
This paper presents a new topology of higher order power filter for grid-tied voltage-source inverters, named the LCL-LC filter, which inserts an extra capacitor connected in parallel to the Lf-Cf series resonant circuit of LLCL filter Particularly, it can strongly attenuate the harmonic currents around the switching frequency, and the attenuation rate become -60dB at high frequency which leading...
Linking the capacitor neutral point of LCL filter to the DC midpoint for transformerless three-level photovoltaic inverter has an advantage of leakage current reduction. But it also brings large current virtual value and low-frequency resonance of bridge-side current, which leads to the reduction of the system efficiency and stability. Aiming at these problems, the common and differential mode model...
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