Abstract
The attractive features of the direct AC-AC converters increase their use in many applications such as voltage control for a heavy-duty load that has a high time constant, AC machine drives, and heating systems based on the induction process. These converters process power in single-stage having simple circuit topologies with reduced switching devices and circuit components. These characteristics lead to the efficient power conversion process. The use of a low-frequency input transformer with multiple output tapping for the regulation of output voltage and frequency is one of the major sources of cost, size, and conversion losses. The complication in the switching algorithms is also the main concern in these converters. The preceding deficiencies lower their potency to be used in daily life. The costly controllers or processors are to be employed to realize the complex control techniques or algorithms. That increases the overall cost and circuit complication. This paper introduces the simple control techniques employed to a novel transformer less multi converter to have the various ac outputs for voltage and frequency regulation. The validation of power circuit and control schemes is tested through the simulation and practical results obtained in Simulink and practical setup respectively.
Highlights
The power generated by the renewable energy system is processed through power converters for grid system integration
The regulation of voltage and frequency is required according to the demand. These areas include grid or load voltage control, heating processes that depend upon the high-frequency induction phenomena, and motor speed control systems
In an electric traction system, the speed control of the induction motor is governed through the frequency regulation in step-down mode at a constant voltage
Summary
The power generated by the renewable energy system is processed through power converters for grid system integration. These targets are achieved through AC-AC converters that regulate the characteristics of the output through voltage and frequency control In these converters, two power conversion approaches are adopted depending on the requirements. These converting topologies are attractive as they have low switching voltage and improved power quality All these characteristics are ensured on the cost of circuit and control complication. These power converting topologies lower the maintenance requirements and overall system losses Their use becomes more valuable for load or grid voltage control as they are realized with a lower number of switching units. 2 investigates the operating of the For performance characteristics of the proposed topology with the existing converters is modes voltage and frequency control with the helpofofthe switching signals
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