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2018 2nd International Conference on Inventive Systems and Control (ICISC), 2018
Grid-connected photovoltaic systems with energy storage, also called PV hybrid mini-grid system (... more Grid-connected photovoltaic systems with energy storage, also called PV hybrid mini-grid system (PVHMS), operate in both grid-tied and stand-alone modes and are expected to play an important role in distributed generation. Transformerless photovoltaic converters are most preferred for these systems due to their higher conversion efficiency in comparison to insulated converters, increasing autonomy of the battery energy storage system (BESS). Safety in transformerless photovoltaic converters is a critical issue due to parasitic capacitance between PV modules and ground that could result in high leakage current. Existing safety requirements for grid-tied PV inverters may not be sufficient for PVHMS converters since they have multiple leakage current paths. This study analyzes some leakagecurrent-related faults on transformerless PVHMS converters, and proposes relay opening sequences to avoid unnecessary interruptions of power supply for the local loads. The following situations are analyzed: i) fault at dc side, ii) fault at ac load side, and iii) commutation between on-grid and off-grid operation modes. These faults have been studied for a transformerless PVHMS converter with a single dc-ac stage. Experimental results are presented to validate the proposed schemes and a table summarizing the proposals is presented.
Renewable energy sources have gained popularity as a result of their reduced environmental impact... more Renewable energy sources have gained popularity as a result of their reduced environmental impact and ability to meet increasing energy demands. The changeability and instability of renewable sources of energy are their defining characteristics.Hybrid power conditioners are designed to handle the various disadvantages of traditional energy sources. Through the use of storage and backup batteries, they can reduce their consumption and provide better reliability. The concept of this system is to use the fuzzy logic controller (FLC) to regulate the flow of power and keep the steady voltage at the point where common coupling occurs. The battery bank is also designed with an interface to the controller.
The method of direct torque control is a powerful means for controlling a specially designed asyn... more The method of direct torque control is a powerful means for controlling a specially designed asynchronous motor. Today, direct control of the moment with the most popular digital signal processors in controlling the AC motor, especially electric induction drives. Fast response and smooth control of the DSP are used to perform real-time simulation of the motor variables to alternating current, so that the electromagnetic moment, flow, mechanical speed, etc. In this article, the implementation of the engine management technique is known for high performance induction. As a direct torque control (DTC) using a three-level inverter and a comparison between the base model and the fault code, the DTC circuit has changed (three levels of the inverter) to minimize the sampling time of the embedded drive system, In DTC drives. The experimental results of this drive system are high-performance on a standard asynchronous a5hp engine to meet expectations and are consistent with theoretical work....
2018 2nd International Conference on Inventive Systems and Control (ICISC), 2018
Grid-connected photovoltaic systems with energy storage, also called PV hybrid mini-grid system (... more Grid-connected photovoltaic systems with energy storage, also called PV hybrid mini-grid system (PVHMS), operate in both grid-tied and stand-alone modes and are expected to play an important role in distributed generation. Transformerless photovoltaic converters are most preferred for these systems due to their higher conversion efficiency in comparison to insulated converters, increasing autonomy of the battery energy storage system (BESS). Safety in transformerless photovoltaic converters is a critical issue due to parasitic capacitance between PV modules and ground that could result in high leakage current. Existing safety requirements for grid-tied PV inverters may not be sufficient for PVHMS converters since they have multiple leakage current paths. This study analyzes some leakagecurrent-related faults on transformerless PVHMS converters, and proposes relay opening sequences to avoid unnecessary interruptions of power supply for the local loads. The following situations are analyzed: i) fault at dc side, ii) fault at ac load side, and iii) commutation between on-grid and off-grid operation modes. These faults have been studied for a transformerless PVHMS converter with a single dc-ac stage. Experimental results are presented to validate the proposed schemes and a table summarizing the proposals is presented.
Renewable energy sources have gained popularity as a result of their reduced environmental impact... more Renewable energy sources have gained popularity as a result of their reduced environmental impact and ability to meet increasing energy demands. The changeability and instability of renewable sources of energy are their defining characteristics.Hybrid power conditioners are designed to handle the various disadvantages of traditional energy sources. Through the use of storage and backup batteries, they can reduce their consumption and provide better reliability. The concept of this system is to use the fuzzy logic controller (FLC) to regulate the flow of power and keep the steady voltage at the point where common coupling occurs. The battery bank is also designed with an interface to the controller.
The method of direct torque control is a powerful means for controlling a specially designed asyn... more The method of direct torque control is a powerful means for controlling a specially designed asynchronous motor. Today, direct control of the moment with the most popular digital signal processors in controlling the AC motor, especially electric induction drives. Fast response and smooth control of the DSP are used to perform real-time simulation of the motor variables to alternating current, so that the electromagnetic moment, flow, mechanical speed, etc. In this article, the implementation of the engine management technique is known for high performance induction. As a direct torque control (DTC) using a three-level inverter and a comparison between the base model and the fault code, the DTC circuit has changed (three levels of the inverter) to minimize the sampling time of the embedded drive system, In DTC drives. The experimental results of this drive system are high-performance on a standard asynchronous a5hp engine to meet expectations and are consistent with theoretical work....