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The benefits of using grid connected Voltage Source Converters (VSC) related to processing and improving of electrical power quality in distribution grid heavily depends on current control (CC) method. Research in this field are mainly focused on response dynamics, stability and accuracy of reference current tracking under strongly distorted grid voltage conditions with variable grid impedance in...
This paper presents a new topology of DC-DC converter with a post-fault operation ability for a Solid-State Transformer. It describes the concept of a Solid-State Transformer as a solution to improve flexibility and functionality of an electrical system. A conventional Solid-State Transformer is presented as well as a proposal for a modified topology based on a hybrid 3-phase Dual Active Bridge with...
In the paper the novel approach to application of the power electronic converters used as a part of shore-to-ship supply arrangement has been presented. Simulation results have confirmed possibility of using control of shore-side converter of shore-to-ship system for synchronizing with ship's voltage and load transferring by parallel work instead of using short blackout or synchronization of ship...
This paper presents a new topology of High Instantaneous Power Impulse Converter (HIPIC). HIPIC at average power of kilowatts is able to generate very short impulses (tens of microseconds) to reach instantaneous high power in megawatt range. The new topology is composed of step-down converters, H-bridge converter and switched capacitor converter, what allows to obtain the output current impulses with...
This paper presents a new control algorithm of High Instantaneous Power Impulse Converter (HIPIC). HIPIC is characterized by high power in megawatt range delivered to the output in very short time. A new algorithm allows fast rising of output current to the set value and a proper peak current control during the impulse by using two types of controllers: hysteresis and PID. Moreover capacitor voltage...
Operation under partial shading condition (PSC) significantly decreases energy extracted from photovoltaic (PV) power plants. Non-uniform insolation caused by the passing clouds and natural obstacles results in some PV modules to be effectively excluded from operation. Commercially used maximum power point tracking (MPPT) algorithms do not have any information about the global behavior of the PV string...
Partial shading and/or mismatch of photovoltaic (PV) modules can cause multiple maxima to occur in their power-voltage curves which can mislead conventional Maximum Power Point Tracking (MPPT) algorithms. This relates both to residential installations and large-scale power plants and can result in significant drop in the overall energy yield. To overcome this problem, a new approach generally referred...
Conventional maximum power point tracking (MPPT) algorithms are designed under assumption that all modules are uniformly insulated and therefore can be characterized by a single maximum power point (MPP). At increasing power level PV arrays become larger in area. Moreover, to achieve a reasonable voltage level modules are connected in series, creating strings. These two factors make any array susceptible...
This paper describes control and modulation algorithm of a simplified multilevel AC-DC-AC converter for small power generation system which is based on well known Neutral Point Clamped (NPC) topology. Main advantage of this approach allows single 3-phase, 3-level converter to be utilized as a full interface between Permanent Magnet Synchronous Generator (PMSG) and the single-phase grid. Study of control...
This paper presents operation of the four-leg three-level Flying Capacitor Converter (FCC) interfacing renewable energy source (RES) with the grid. Such converter with proposed control method enables work in association of electrical grid disturbances by switching all legs separately to stand-alone or grid connected mode of operation, what allows for energy transfer between them. Four-leg FCC with...
This paper presents operation of the four-leg three-level Flying Capacitor Converter (FCC) interfacing renewable energy source (RES) with the grid. Such converter with proposed control method enables work in association of electrical grid disturbances by switching all legs separately to stand-alone or grid connected mode of operation, what allows for energy transfer between them. Four-leg FCC with...
This paper presents operation of the four-leg three-level flying capacitor converter with active filtering function interfacing renewable energy source with the grid. Such solution in contrast to three-leg converter gives possibility to eliminate dy transformer mandatory for proper stand-alone mode of operation. The four-leg converter with proposed control method enables work at different electrical...
This paper proposes improvements to the control method based on the complete dynamical model published by Kömürcügil and Kükrer, which is very simple by operation in the stationary reference frame and lacks ac-line-current sensors. Nevertheless, the basic control method is very sensitive to variations of the line inductances, which provide difficulties in many industry applications. The modifications...
This paper presents a new Space Vector PWM Modulation (SVM) method for a three-level flying-capacitor inverter. In proposed technique switching losses are reduced by using minimal number of vectors in modulation period as well as proper selection of zero vectors. Regulation of the voltages on the flying capacitors is independent from the output voltage control. Simple algebraic equations are used...
This paper proposes an advanced control of three-phase three-level neutral point clamped (3L-NPC) PWM converter connecting a permanent magnet synchronous generator (PMSG) to a grid. Control scheme is mainly based on active and reactive power loops and contains following additional blocks: virtual flux and filter-capacitor voltage estimators for sensorless operation, active damping (AD) of possible...
This paper proposes an advanced control of three-phase three-level neutral point clamped (3L-NPC) PWM converter connecting a permanent magnet synchronous generator (PMSG) to a grid. Control scheme is mainly based on active and reactive power loops and contains following additional blocks: virtual flux and filter-capacitor voltage estimators for sensorless operation, active damping (AD) of possible...
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