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This paper proposes a model predictive control (MPC) scheme for the interleaved dc-dc boost converter with coupled inductors. The main control objectives are the regulation of the output voltage to its reference value, despite changes in the input voltage and the load, and the equal sharing of the load current by the two circuit inductors. An inner control loop, using MPC, regulates the input current...
This paper is focused on the implementation of an original algorithm for global maximum power point tracking (GMPPT) in photovoltaic systems. The algorithm detects when partial shading occurs, thus eliminating unwanted voltage sweeping. The paper gives a detailed analysis on how the algorithm succeeds in finding the global maximum power point (GMPP) in a short time and all its highlights. The system...
This paper presents a method for estimating the voltages at the individual sub-module capacitors of Modular Multilevel Converters (MMCs). The estimation method is designed according to a predictor-corrector scheme with a model-based prediction stage utilizing the arm current measurements and the internal modulation signals of the control system. The corrector stage is based on measurement of the total...
Conventional direct power control (DPC) technique is a simple and efficient control strategy for three-phase PWM rectifier. However, its performance is deteriorated when the converter is supplied by unbalanced or distorted grid voltages. This paper presents the design and implementation of a new DPC scheme based on disturbance rejection principle to achieve sinusoidal input currents operation of three-phase...
Droop scheme has been widely applied to the control of Distributed Generators (DGs) in microgrids for proportional power sharing based on their ratings. For standalone microgrid, where centralized management system is not viable, the proportional power sharing based droop might not suit well since DGs are usually of different types unlike synchronous generators. This paper presents an autonomous droop...
In the case of contactless power transfer system with the electromagnetic induction, the coupling coefficient between the coils is reduced by the misalignment of the receiving coils. This results in reduction of the output voltage and the active power in the coils. To cope with this problem, an instantaneous current control method is applied to the PWM rectifier of a single-phase contactless power...
Algorithms of synchronized pulsewidth modulation (PWM), based on special space-vector control scheme (with utilization of minimal number of voltage space vectors), have been applied for synchronous control of four neutral-point-clamped (NPC) inverters feeding six-phase (dual three-phase) drive on the base of asymmetrical open-end windings induction motor. It allows providing continuous synchronization...
This paper proposes a digital Robust Model Reference Adaptive Control (RMRAC) applied to control the output current (by the grid side) of a three-phase LCL-filter to applications in static converters connected to electric grid. The proposed controller is based on a modified RLS algorithm applied to adaptation of the controller gains. Experimental results show the good performance of the proposed control...
This contribution investigates three-phase four-level FLC based indirect frequency converter supplied from a 6kV AC-grid. It describes proposed active voltage balancing control of both output voltage-source inverter and input active rectifier with PD-PWM. The results are verified by experiments made on down-scale prototype of converter of rated power of 35kVA.
This paper deals with a 3-phase H-bridge inverter feeding a Permanent Magnet Synchronous Machine drive. An innovative Space Vector PWM strategy gathers electric vehicle (EV) specifications and objectives like high reachable base speed, minimization of zero-sequence current ripple and switching losses. In this paper, authors present experimental results performed on inductive inverter prototype.
In this paper, seamless model of bi-directional DC-DC converter which is applicable to bi-directional power transfer is proposed. Conventional modeling method of bi-directional DC-DC converter is complex, because different models are needed for different directions of power flow. On the other hand, seamless model can be applied for both directions of power flow. Seamless circuit model is expressed...
CERN is studying the implementation of high power active front ends, implying the operation of a voltage source inverters connected to a grid that can be considered as weak when compared to the converter nominal power. Proper synchronisation is a key point for current control stability. The handling of networks with asymmetric disturbances implies the accurate handling of the second harmonic component...
LCL-filters are used to mitigate the harmonic current content in grid converters. The LCL-filter resonance must be damped in order to avoid stability problems in the current control. Active damping avoids resistors at the expense of increased control complexity. Large grid impedance variations can challenge the LCL-filter stability. Active damping by using a notch filter on the reference voltage for...
The paper main objective is to provide a feasibility study for the connection of a wind turbine to a dc microgrid. The wind turbine, provided by WES, uses a squirrel-cage generator, which is a given project variable. Hence, the main aspects which determines the performance of the the wind turbine connection to the dc microgrid are related with the turbine control — such as the maximum power point...
In this paper, an online filtering technique advantage is presented to improve the decoupling method already used on energy management for electric vehicles and hybrid electric vehicles. The most widely used power sources in electric vehicles and hybrid electric vehicles are batteries, super-capacitors and fuel cells. Several studies have been made on these type of power sources and concludes that...
The paper presents the dc-link voltage balancing method for a five-level hybrid asymmetric multilevel converter based on a neutral point clamped (NPC) converter with H-bridge (HB) converters. The considered converter, which is referred to as NPC-HB, is treated in this paper as a modification of the classic three-level NPC converter. It improves the harmonic performance of output voltage compared to...
The optimal choice of switches within a hysteresis controller with a d-q-related constraint is discussed in this paper. The hysteresis controller controls a bidirectional two-level three-phase standard inverter. This paper expands the options of switching processes to a former published d-q-hysteresis controller. Despite a separate active and reactive hysteresis constraint which is offered, further...
This paper points out the generic matrix approach to design Pulse Width Modulation strategies of three-phase Voltage Source Inverters. This well-known problem has infinitely many solutions, and many modulation methods already exist. This mathematical approach deserves to be explored by its rigor and must identify known but also new solutions.
Unidirectional power flow voltage source converter high voltage direct current (VSC-HVDC) systems can be advantageously used in future dc subsea electric transmission and distribution systems (DC-SETDS) in order to reduce cost, increase efficiency and reliability. This work proposes a unidirectional modular multilevel converter (uMMC) suitable for VSC-HVDC systems used in DC-SETDS. The main advantage...
A per-phase sub-module capacitor voltage balancing scheme for the Alternate Arm Converter (AAC) is proposed. Leg balancing regulates the sum of sub-module capacitor voltages in a leg to its set-point. Arm balancing regulates each sub-module capacitor voltage to the nominal sub-module capacitor voltage. Additional converter control requirements and the modulation scheme are also discussed. The control...
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