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Due to the unbalance condition, the voltage of microgrid would be deteriorated. In this paper, a unify unbalance compensation strategy is proposed to suppress the unbalanced voltage and the voltage variation for islanded microgrid with unbalanced condition. Comparing to the traditional compensation strategy, where only negative sequence components of voltage are suppressed, in the proposed scheme,...
In paralleled inverters UPS system, Virtual impedance is applied widely in inverter to decouple the active power and reactive power of inverter and improve the power average sharing accuracy. Proper virtual impedance also can estimate the circulating currents resulted from the asymmetric parameters of different inverter modules. In practical paralleled inverters system, when one inverter prepares...
Weather-dependent photovoltaic (PV) system power variation may become frequent and rapid, which could be regarded as perturbation for the microgrid (MG). This perturbation would lead to voltage and frequency fluctuations and dramatically degrade the MG performances. Conventional secondary control strategy could restore the voltage and frequency after a certain time delay, but it cannot satisfy the...
Stability analysis is very important in the design and in the operation of microgrid, because microgrid always contains many Distributed Generations(DGs), power electronic converters and constant power loads. Harmonic impedance is a useful parameters in the stability analysis. In this paper, the structure of microgrid is introduced detailed. The control strategies of inverter operating in different...
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