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This paper presents a method to shed off the least important loads in a microgrid operated at constant frequency under the contingency of inadequate power generation. Different from conventional frequency deviation based load shedding, this paper discusses in detail how to shed off load based on the voltage deviation. The key issue is to differentiate whether the voltage deviation is due to sudden...
In order to increase the weighted efficiency of the photovoltaic micro-inverter, this paper proposes a flexible topology DC/DC converter as the former stage in the micro-inverter. The flexible converter includes two operation topology, which are improved dual-switches forward topology and full-bridge topology, respectively. The operation principles of the two topologies are introduced and the design...
This paper proposes a novel control strategy for the brushless DC motor drive system fed by electrolytic capacitor-less inverter. In order to obtain high power factor, this paper proposes a new control method that regulates the inverter input current. The calculated compensation current of small film capacitor is subtracted from the ideal ac input current, which is regarded as the ideal inverter input...
This paper compares the performance of surface PM generators when operated with a switched-mode rectifier and an inverter. An analytical model including losses for the surface PM generator and power electronics controller is developed and validated against simulations and experimental results. This is used to generate efficiency maps as a function of output power and speed for the generator operating...
A novel isolated high step-up gain DC-DC conversion system for HVDC grid-connected PV power generation applications is proposed in this paper. The proposed system has a distributed MPPT and centralized step-up DC-DC configuration. By employing distributed MPPT converter, high power losses caused by partial shading of the PV arrays can be reduced significantly. Modular scheme is adopted for the centralized...
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