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The well-known droop control and master-slave control methods are two dominant coordinative control schemes for inverter interfacing parallel distributed energy resources (DERs) in islanded AC microgrids. However, both these two control methods have some drawbacks and inherent limitations in practical application. After analyzing their complementary strengths and weaknesses, this paper proposed a...
The well-known droop controlled parallel voltage source inverters are widely used in islanded microgrids to realize proportional power sharing based on ratings. However, when considering different loss characteristics of inverters, traditional droop control method is not an optimal power allocation scheme. This paper proposed a novel hierarchical operation strategy to realize overall efficiency optimization...
The microgrid must be able to transfer into islanding operation mode to guarantee the power reliability for the critical local load, while the power injected into the main grid by the microgrid should be smoothed in order to reduce the disturbance to the main grid. A control strategy regarding these issues for the microgrid is proposed in this paper. The configuration of the microgrid is presented...
Z-source inverter and traditional two-stage buck-boost inverter are compared with respect to the voltage stress and maximum current stress of semiconductor devices and the inverter efficiency in grid-tied renewable energy generation application. The operation principles of the two inverters are introduced firstly, considering the two different PWM strategies used in Z-source inverter. Based on the...
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