How to decide on capacitor value of DC link capacitor and balancing capacitor for a flying capacitor multilevel inverter?Are there capacitance values same?How to calculate them?
Firstly, these capacitors are for highest capacitance, include values greater of some Farads!
These capacitors have latest technology due the specials internal components.
I ask you a question; do not you design for high voltage, do you?, because for high voltage keep relation with total kvar need to give to electrical network, do not forget the work voltage. Although the low voltage will be similar.
Abstract, the value is started from the kvar requests.
Basically the value of the capacitor depends on the voltage ripple and switching frequecy. there are some other parameters also published in various publications on which the capacitor value may depend on. But largely depends on the ripple and the switching frequency. 10% voltage ripple is according tho standards is allowed. You can find the formulas of calculating the capacitor in various publications. Generally small value gives you more fast response at the cost suceptibility of the prone to the fault. While the large value of the capacitor gives you the robust performance but poor(sluggish) response.
First develop the state space model of your inverter, taking the inserted capacitors voltages as state variable. For finding flying capacitors, apply charge balance.
They are called Flying Capacitor , because the capacitors float with respect to earth’s potential!!
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