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This paper reports on inverter nonlinearity effects on sensorless control methods based on high-frequency signal injection (HF-injection). Inverter output voltage distortions and their influence on position detection are described analytically and their compensation is discussed. Furthermore it is pointed out that the effects of inverter nonlinearities on sensorless control depend on whether the rotating...
In high power medium voltage drives the switching frequency of power semiconductor devices is limited because of high switching losses. These drives often consist of a three-level NPC inverter with an LC output filter to protect the motor from harmonics. Application of the filter creates a resonant circuit that may be excited for instance by switching harmonics or control transients. However, state...
In high power medium voltage drives, the switching frequency of power semiconductor devices is restricted because of high switching losses. Such drives often include an LC output filter, introducing a resonant circuit that may be excited for instance by fast control transients. One way to avoid such oscillations is using damping control schemes, which in turn usually require switching frequencies...
Multilevel converters have attracted much interest due to increasing applications of medium and high voltage inverters in drives and in FACTs. A large number of topologies and control strategies have been proposed in the literature. Among the topologies, the modular multilevel inverter using several cascaded H-bridges is rather popular, with each H-bridge supplied by an isolated DC voltage source...
This paper presents a detailed analysis and optimisation of output filters for inverter fed drives. The goal is to minimise the total cost of the filter components when the maximum deviation of the fundamental output voltage and the minimum suppression of harmonic voltages are given. The analysis is based on the full equivalent circuit diagram of induction machines and thus covers all possible load...
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