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A novel DC-link voltage and current control algorithm for Three-Level Neutral-Point-Clamped converters (NPCs) is proposed in this paper. It is developed with the aim of sharing the overall DC-link voltage among DC-link capacitors as needed, without impairing NPC load performances. The proposed algorithm consists of an external DC-link voltage control loop, which synthesizes an appropriate reference...
The growing availability of high power semiconductor devices and the increasing necessity of high power converters in power systems and industry applications demand the use of multilevel converters topologies, such as the 3-level neutral point clamped voltage source converter. The tradeoff in designing this kind of converter is between switching losses and fast dynamic control. The size and cost of...
In this paper, an active power filter (APF) based on a modified one-cycle control is proposed. This control method can be applied in a three-level three-phase four-wire system. By adding an additional current sensor to detect the fundamental component of the output current, the proposed APF is capable of compensating harmonic components independently from the VAR compensation so that the capacity...
A fully digital, non-linear, wide bandwidth, current controller for DC-AC and DC-DC voltage source converters is presented in this paper. Exploiting oversampling, the controller mimics an analog hysteresis current controller, but does not employ analog comparators and digital to analog converters. Indeed, it fully virtualizes the hysteresis controller's operation and, based only on a non linear, efficient,...
This paper presents a direct, adaptive and parameter-free current control scheme that is independent of the motor type and doesn't need any machine parameters. A given setpoint can be reached accurately within one switching cycle.
This paper presents low computation algorithms for single phase integration of permanent magnet generators associated with a wind turbine emulator test-rig. The grid synchronisation and grid side control are performed by Second Order Generalised Integrators (SOGI). A SOGI-FLL (frequency locked loop) was used for robust, accurate and low computation single phase grid synchronisation. Proportional-Resonant...
This paper investigates a new approach to develop and implement a virtual flux oriented control (VFOC) for the front-end three phase bidirectional voltage source converter (VSC) by adapting the principle operations of voltage oriented control (VOC) and power estimation used in virtual flux direct power control (VFDPC). The proposed VFOC operates with minimal number of sensors by avoiding the used...
This paper presents an industrial platform for the testing of power converters for variable speed electrical drives at the end of the production line. For this purpose, the converter under test does not supply a real electrical machine but another power electric converter acting as a load emulator that regenerates the power into the grid. The testing platform is intended to emulate all necessary tests...
This paper presents an improvement of a field programmable gate array (FPGA) based scalable inverter drive to control electrical machines. In order to enhance the average utilization of the resources (logic cells and dedicated hardware) of the FPGA, an application-specific instruction-set processor (ASIP) is designed and implemented on the FPGA. To promote better organization of the source code, it...
Modular Multilevel Converters have a large number of advantages at high voltage and power levels. Due to their modular structure, they offer easy scalability, high quality output waveforms, and superior availability, to name a few. This paper aims at further increasing the availability of the Modular Multilevel Matrix Converter. A new method allows to operate the converter even in the case that a...
Grid-connected photovoltaic (PV) systems with power electronic interfaces are becoming popular since they do not contribute to environmental pollution. However, one of the issues with grid feeding inverter is the requirement of high dc-link voltage. In view of this, single stage solar inverters using conventional inverters may not be suitable, since they require input dc voltage higher than the peak...
A simple and robust multi-objective predictive control method that incorporates four main control objectives applied to a single-phase three-level neutral-point-clamped (NPC) converter operating as an active power filter (APF) is proposed in this paper. The four control objectives are: to self-support the dc-bus voltage under load variations, to compensate the reactive power and the current harmonics...
This paper proposes a current controller for grid tied Voltage Source Inverter (VSI) via a LCL filter using discrete-time Sliding Mode Control (SMC) in a multi-loop framework. The inner loop is implemented by the SMC with reference generated by an outer controller for the VSI side current. The tracking of the current entering the distribution network is ensured by a outer controller with a derivative...
Recently, Modular Multilevel Converters (MMCs) have received an increasing attention since this topology of converters is a viable solution for high-voltage and high-power applications. However, many research results concerning the control problems of modular multilevel converters have been proposed in the literature which the main control problems are to control the grid and differential currents...
Common mode voltage reduction is one of the most important issues for transformerless PV grid-connected inverters. Many interesting single-phase inverter topologies have been reported to reduce the common mode voltage. However, three-phase PV inverter topologies with reduced common mode voltage are not well explored. In this paper, a novel three-phase seven-switch (H7) inverter is proposed to reduce...
Model predictive control algorithms have recently gained more importance in the field of power electronics and motor drives. One of the important categories of model predictive control methods is improved deadbeat control in which the reverse system model is used to calculate the appropriate inputs for the next iteration of controlling process. In this paper, a new improved deadbeat algorithm is proposed...
This paper proposes a method of dynamic parameter tuning for a sensorless force control system with I-P(Integral-Proportional) current controllers. All free parameters of the whole system are determined theoretically by pole assignment method. This paper describes that gain of current controllers and estimation bandwidth of a disturbance observer have to be set according to stiffness of target environment,...
This paper proposes and analyzes a current control technique applied to the current control of a three-phase shunt Active Power Filter. The technique is based on an adaptive variable structure controller. The adaptive algorithm compensates for the parametric uncertainties and a modification is applied for robustness with respect to the unmodeled dynamics. The variable structure action built in the...
When considering issues such as power shortage, environmental pollution, and dependence on petroleum, a battery energy storage system (ESS) is one of the promising options to overcome these problems. This paper deals with a 3 kW residential battery ESS that consists of a buck/boost power conversion unit, a DC/AC bidirectional conversion unit, and a Li-ion battery pack with a battery management system...
DC Microgrids (MGs) are increasingly popular in recent years to support distributed generation based power systems. This paper focuses on the improvement of the load sharing control strategy and presents a decentralized control scheme, namely improved digital average current sharing (IDACS). Compared to the conventional hierarchical droop control scheme, the IDACS shows the structural difference and...
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