A Simple Method for Reducing THD and Improving the Efficiency in CSI Topology Based on SiC Power Devices

Fernández, E.; Paredes, Alejandro; Sala, Vicent; Martinez, Joe L.

doi:10.3390/en11102798

Cited by 17 publications

(8 citation statements)

References 27 publications

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“…The sequence of SV-PWM has a large influence on common-mode voltage reduction and may cause bearing currents, especially in high-power machines, as described in [22]. Another interesting aspect of the construction of CSI, shown in [23], is the use of silicon carbide transistors, which allow to increase the frequency of the PWM modulator to tens of kHz and reduce the size of passive elements in the inverter.…”

Section: Model and Simulation Resultsmentioning

confidence: 99%

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Nonlinear Control of a Doubly Fed Generator Supplied by a Current Source Inverter

Blecharz

Morawiec

2019

Energies

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Nowadays, wind turbines based on a doubly fed induction generator (DFIG) are a commonly used solution in the wind industry. The standard converter topology used in these systems is the voltage source inverter (VSI). The use of reverse-blocking insulated gate bipolar transistor (RB-IGBT) in the current source inverter topology (CSI), which is an alternative topology, opens new possibilities of control methods. This paper presents a novel power control system for a DFIG supplied by a CSI. The authors propose to use multi-scalar DFIG state variables. A nonlinear control method realized by feedback linearization was used to control the active and reactive powers of the generator. In the feedback linearization controls, the nonlinear DFIG model was taken into account. In the control system structure, classical proportional–integral controllers were used. The control variables were the output current vector components of the CSI. Such approach was named the “current control”. The proposed control method is characterized by good dynamic properties which, combined with the inverter properties in the rotor circuit, allow to increase the quality of the energy transferred to the grid by the generator. In the simulation tests, the correctness of the decoupling of the active and reactive power control loops, the dynamics of controlled power changes, and the change of the machine operating range resulting from the increase of the rotational speed of the generator shaft were controlled. The simulation studies also evaluated the impact of changes in the value of the passive elements of the system on the operation of the generator system. Characteristic operating states of the generator system were analyzed using computer simulations.

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Section: Model and Simulation Resultsmentioning

confidence: 99%

“…It should be noted that Equations (23) and (24) may be simplified due to the fact that in steady-state, the auxiliary variables u sf1 and u sf2 are approximately equal to 1 and 0 in p.u. In the simplified version of the equations, they take the form:…”

Section: Active and Reactive Power Control Systemmentioning

confidence: 99%

Nonlinear Control of a Doubly Fed Generator Supplied by a Current Source Inverter

Blecharz

Morawiec

2019

Energies

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“…Equations (14) and 15can be re-written again as given in (16) and 17with neglecting the term * * which it is the result of the product of two AC small signals.…”

Section: Pfc Boost Converter Average Small Signal Modellingmentioning

confidence: 99%

“…For the output voltage control loop, PI controller is enough to regulate the output voltage to the specified value [14], but for the inductor current control loop, the slow response of the PI current controller at the current zero-crossing point causes distortion of the inductor current which leads to increasing the THD of the supply current [15]. Increasing of the THD in the converter circuits, causes higher power losses in all circuit components, further, it can lead to high current stresses and failures of the system insulation and protection [16]. Power quality and performance requirements required to maintain the THD value at the standard values such as IEEE 519-20142 [17], and IEC 61000-3-2 [18], which suggests that in order to improve the circuit P.F, reducing the current stresses and reducing the power losses in the system different parts, THD should be kept at the lowest value with the given standard requirements [17,18].…”

Section: Introductionmentioning

confidence: 99%

Optimal IP Current Controller Design Based on Small Signal Stability for THD Reduction of High-Power Density PFC Boost Converter

Okilly¹,

Baek²

2020

Preprint

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This paper presents an optimal design for the inner current control loop of the continuous current conduction mode (CCM) power factor correction (PFC) stage, which it can be used as the front stage of the two stages alternating current-direct current (AC-DC) telecom power supply. Conventional single-phase CCM-PFC boost converter usually implemented with using of the proportional-integral (PI) controllers in both of the voltage and current control loops, to regulate the output DC voltage to the specified value, moreover to maintains the input current follows the input voltage which offers converter with high power factor (P.F) and low current total harmonic distortion (THD). However, due to the slow dynamic response of the PI controller at the zero-crossing point of the input supply current, input current can’t fully follow the input voltage which leads to high THD. Digitally controlled PFC converter with an optimal design of the inner current control loop using doubly control loops IP controller to reduce the THD and to offer input current with unity P.F was performed in this paper. Furthermore, for the economic design of the digitally control PFC converter, two isolated AC and DC voltage sensors are proposed and designed for the interfacing with the microcontroller unit (MCU). PSIM software was used to test the converter performance with using the proposed designed current controllers and isolated voltage sensors. High power density digitally controlled telecom PFC stage with P.F of about 99.93%, full load efficiency of about 98.70% and THD less 5.50% is achieved in this work.

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“…At higher switching frequency applications, the multilevel converter topologies have a lower total harmonic distortion (THD) factor than two-level converters [10]. Furthermore, a simple technique is developed in [11] to reduce THD and improve efficiency based on SIC semiconductor power devices.…”

Section: Introductionmentioning

confidence: 99%

Power Loss Model and Efficiency Analysis of Three-Phase Inverter Based on SiC MOSFETs for PV Applications

et al. 2019

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This paper presents the power loss model analysis and efficiency of three-level neutral-pointclamped (3L-NPC) inverter that is widely employed in solar photovoltaic energy conversion system. A silicon carbide (SiC) 3L-NPC inverter is developed in this paper by employing wide bandgap semiconductor power devices, such as SiC MOSFET and SiC diode (SiC D). These devices are used due to their superior characteristics over silicon (Si) semiconductor devices for the reduction of inverter power losses, and as a result, an improving efficiency at the high switching frequency. Accurate and detailed power loss calculation formula and power loss distribution over switching devices of the SiC 3L-NPC inverter are derived according to the modulation technique and inverter operation. The switching energy loss of SiC MOSFET is then measured and determined experimentally via inductive clamp double pulse test (DPT) at the real working condition of the circuit. Afterward, this experimental data is used in the thermal description file of the device's library of PLECS simulation software to determine the total power loss of SiC 3L-NPC inverter. The developed simulation model replicates the real operating conditions of the 3L-NPC inverter. This method gives results close to the practical test. Finally, the power loss of SiC 3L-NPC inverter is measured and compared with the theoretical results. Furthermore, SiC MOSFET and SiC D are employed to achieve high system efficiency at the high switching frequency. The results verify the features of SiC 3L-NPC inverter, the corresponding modulation technique used and their effects on reducing and improving power loss in solar SiC photovoltaic inverters. INDEX TERMS Three-level neutral-point clamped inverter (3L-NPC), SiC MOSFET, power loss, DPT-double pulse test, PLECS.

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A Simple Method for Reducing THD and Improving the Efficiency in CSI Topology Based on SiC Power Devices

Cited by 17 publications

References 27 publications

Nonlinear Control of a Doubly Fed Generator Supplied by a Current Source Inverter

Nonlinear Control of a Doubly Fed Generator Supplied by a Current Source Inverter

Optimal IP Current Controller Design Based on Small Signal Stability for THD Reduction of High-Power Density PFC Boost Converter

Power Loss Model and Efficiency Analysis of Three-Phase Inverter Based on SiC MOSFETs for PV Applications

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