Is a hybrid capacitor bank suitable for a single-phase inverter with unipolar modulation?

The design procedure of the hybrid capacitor bank for the single-phase inverter with unipolar modulation is discussed. The performance of the proposed capacitor bank is verified by both simulation and experimental results. This research was undertaken, in part, thanks to funding from the Canada Excellence Research Chairs (CERC) Program.

Can electrolytic capacitors be replaced with film capacitors in PV Grid-Connected inverters?

Thus, the electrolytic capacitor connected in parallel with the dc link can be replaced with a film capacitor to improve the lifetime and reliability of PV grid-connected inverters. The active power decoupling circuit (APDC) is normally a bidirectional dc/dc converter connected in parallel or in series with the dc link, as displayed in Fig. 2.

How a film capacitor can be used in a PV Grid-connected inverter?

The principle of the APD is to divert SRP to a small film capacitor and store it by swinging its voltage . Thus, the electrolytic capacitor connected in parallel with the dc link can be replaced with a film capacitor to improve the lifetime and reliability of PV grid-connected inverters.

What is the topology of a decoupling capacitor?

The proposed topology consists of a dc–dc stage, a decoupling stage and an inverter stage, where each stage is controlled independently. In consideration of the instantaneous power fluctuations on the filtering elements, the optimal voltage reference of the decoupling capacitor is derived and implemented in the proposed decoupling control strategy.

How to control decoupling capacitor voltage VCS?

In the decoupling stage control, the decoupling capacitor voltage vCs should be regulated to prevent the overcharging and overdischarging of the capacitor Cs. The PI controller generates the reference current iCs_ref after comparing the voltage vCs with the given value vCs_ref.

What does k mean in a decoupling capacitor?

The higher the value of k, the more unused redundant energy in the system. The capacitor voltage and the current with k = 1, k = 2, k = 3, and k = 5 are illustrated in Fig. 4. The capacitance of the decoupling capacitor is selected as 30 μF, and the parameters of the filtering elements are listed in Table 1.