Abstract
High-power converters for high-voltage direct current transmission systems and collecting networks are attracting increasing interest for application in large offshore wind farms. Offshore wind farms are capable of generating more electric energy at lower cost when compared with onshore wind systems. In this study, DC/DC voltage conversion should be achieved with a power converter that uses readily available semiconductor devices. A modular DC/DC converter can achieve the required system currents and voltages without exceeding semiconductor ratings. In this study, the operation and control strategy for an input-series–input-parallel–output-series (ISIPOS) energy conversion system for wind systems are presented. The ISIPOS system allows the direct connection of wind turbines to the DC grid. In this research, the design process to control the input and output currents and voltages is explained. In addition, a new method to ensure voltage and current sharing between the different modules is presented and explained. The basic structure, control design, and system performance are tested using MATLAB/SIMULINK. Practical results validate the control design flexibility of the ISIPOS topology when controlled by a TMSF280335 DSP.
Highlights
In the irreversible electroporation (IRE) process, a harmful microorganism cell-membrane is subjected to high electric field strength via a train of sufficiently high-voltage (HV)pulses [1]
A unipolar step-up pulse generators (PGs) (SUPG) fed from a LVDC supply is proposed based on isolated inputparallel/output-series (IPOS) voltage-boosting modules (VBMs) and modular multilevel converter (MMC)-SMs
This paper proposed a new HV pulse generator topology for electroporation applications
Summary
In the irreversible electroporation (IRE) process, a harmful microorganism cell-membrane is subjected to high electric field strength via a train of sufficiently high-voltage (HV). Conventional rectangular pulse-waveforms can be generated by MMC based PGs, but a wide range of pulse-waveforms is possible [5] and [10] The majority of these topologies require an HVDC input supply and the obtained pulse peak-voltage is that of the input HVDC level. An exception for obtaining stepped-up voltage pulse from low voltage (LV) DC input are [13] and [14], where several series connected MMC SM capacitors are charged sequentially, connected in series across the load to discharge. A unipolar step-up PG (SUPG) fed from a LVDC supply is proposed based on isolated inputparallel/output-series (IPOS) voltage-boosting modules (VBMs) and MMC-SMs. The VBMs are isolated via nanocrystalline core based transformers which have low leakage and magnetizing inductance and are suitable for highfrequency operation [19]-[20]. SUPG performance is assessed via Matlab/Simulink simulations and scaled-down experimentation
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