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This paper proposes the improved topology and control strategy of three-phase cascaded bridgeless rectifier (CBR) suitable to serve as the rectifier stage for a medium/high voltage multilevel converter. Compared with traditional H-bridge based multilevel rectifiers, the proposed topology adopts much fewer fully-controlled devices, which greatly reduces the control complexity, thus increasing the system...
Formal program verification is a powerful technique to ensure the correctness of programs. To perform this technique, one oftentimes needs to manually specify assertions, which is a time-consuming and error-prone task. Generating assertions automatically can significantly improve the usability of formal program verification. To decide where an assertion is needed heavily and which value range of the...
This paper presents a new unidirectional cascaded bridgeless multilevel rectifier (CBR) well suited for serving as the rectifier stage of a transformerless cascaded multilevel converter. Compared to a traditional cascaded H-bridge rectifier, the proposed CBR utilizes fewer fully controlled switching devices by replacing the fully controlled H-bridge modules with bridgeless PFC modules, thus simplifying...
This paper addresses the optimal design of leakage inductance of the high-frequency transformer in dual active bidirectional converter stages of cascaded bidirectional converters. By the analyzing realization condition of zero-voltage-switching and the method to reduce reactive power under controlling of single phase shifting control strategy, the optimized circuit parameters are selected. An experimental...
In this paper, the relations among the active power distribution, modulation wave and unbalanced loads range are analyzed. A maximum unbalanced loads range is proposed by modifying modulation waveforms under the unity power factor. And a modified staircase modulation, which is easy to realize, is proposed for a single-phase cascaded H-bridge multilevel rectifier to extend the range of unbalanced loads...
The traditional direct power control (DPC) strategy exits the problems that the switching frequency is not fixed, the sampling frequency is high and so on. To combat these problems, a control system of improved virtual-flux control strategy with DPC (VF-DPC) is proposed in the paper. In order to overcome the problem that switching frequency is not fixed, hysteretic controller and switching table are...
A new fuzzy logic (FL) controller using the TSK technique that will manipulate an AC synchronous motor to produce reactive power to bring the entire system to the optimum operating point is presented. The FL controller performs adequately both rapid and slow changing load condition.The FL controller performance was highly satisfactory in tracking and improving the plant PF to achieve the set point,...
In this paper, a new performance for capacitor compensators is proposed to limit the fault current in power systems which capacitors used. In the normal mode of operation, the shunt capacitors banks as reactive power compensators that delivers reactive power to increase the power factor. When faults states occurs, the capacitor can reduce fault current peak value, a dynamic model for calculating short-circuit...
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