Abstract:To improve the robustness and performance of the dynamic response of a cage asynchronous motor, a direct torque control (DTC) based on sliding mode control (SMC) is adopted to replace traditional proportional-integral (PI) and hysteresis comparators. The combination of the proposed strategy with sinusoidal pulse width modulation (SPWM) applied to a three-level neutral point clamped (NPC) inverter brings many advantages such as a reduction in harmonics, and precise and rapid tracking of the references. Simulati… Show more
“…Direct Power Control (DPC) technique can provide DFIG with direct power regulation capability. It avoids PLL and complex parameters tuning in the traditional VOC, which has been widely discussed in recent years [11]- [21]. The conventional DPC utilizes a Look-Up Table (LUT) structure to select switching signals [11].…”
Section: Take Down Policymentioning
confidence: 99%
“…It obtains a fast power convergence speed and a high robust property against DFIG parameters mismatch. However, it usually brings a power chattering problem [21], [27]. A Back-Stepping (BS) algorithm combined with direct power control is developed in [18], which has a simple structure and obtains satisfactory steady-state performance.…”
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“…Direct Power Control (DPC) technique can provide DFIG with direct power regulation capability. It avoids PLL and complex parameters tuning in the traditional VOC, which has been widely discussed in recent years [11]- [21]. The conventional DPC utilizes a Look-Up Table (LUT) structure to select switching signals [11].…”
Section: Take Down Policymentioning
confidence: 99%
“…It obtains a fast power convergence speed and a high robust property against DFIG parameters mismatch. However, it usually brings a power chattering problem [21], [27]. A Back-Stepping (BS) algorithm combined with direct power control is developed in [18], which has a simple structure and obtains satisfactory steady-state performance.…”
General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.-Users may download and print one copy of any publication from the public portal for the purpose of private study or research.-You may not further distribute the material or use it for any profit-making activity or commercial gain -You may freely distribute the URL identifying the publication in the public portal -
“…Power electronic inverters play more and more important roles in many research fields like motor-driven machines, microgrids, photovoltaics (PVs) and so on [1][2][3][4][5]. One of the basic reasons is the increasing incorporation of direct current (DC)-based renewable energy sources (RES) and storage (PVs and batteries) in the grid, for environmental purposes.…”
An intelligent control strategy based on a membership cloud model in a high reliable off-grid microgrid with a reconfigurable inverter is proposed in this paper. The operating principle of the off-grid microgrid with the reconfigurable inverter is provided, which contains four operating modes. An open-circuit fault diagnosis for the inverter is presented first. The polarities of the midpoint voltages defined in the paper are used to recognize the faulty power switch. The reconfigurable inverter allows the power switches of different bridges to be reconfigured, when there are power switches faulty, to let the inverter operate in faulty state. The working principle of the reconfigurable inverter is given. The membership cloud model with two output channels is built to obtain the virtual impedance to suppress the circulating currents between inverters when the reconfigurable inverter is in faulty state. A pulse resetting method is presented. The general intelligent control strategy for the reconfigurable inverter is formed as the droop-virtual impedance-voltage-current-pulses resetting control. The validity of the intelligent control strategy of the system is verified by simulation.
“…The DPC has been proposed for years [22]- [29]. It has fast transient dynamics and usually does not need grid synchronization.…”
Section: Introductionmentioning
confidence: 99%
“…Recently, some studies have proposed to combine the DPC strategy with Pulse Width Modulation (PWM), which obtains a constant switching frequency [23]. Sliding Mode Control (SMC)-DPC [24], [29] and passivitybased control (PBC)-DPC [25] were designed for VSCs, which improves the system robustness against parameter mismatch. However, the SMC-DPC usually brings power chattering problem.…”
The impedance analysis has been proposed and proved to be an effective way to analyze the grid-connected stability of Voltage Source Converter (VSC) based energy conversion systems. Most of the existing impedance analyzes are discussed based on vector oriented control, while there are few discussions about the impedance analysis of Direct Power Control (DPC). In this paper, an impedance modeling approach of VSC using the DPC is firstly proposed and analyzed, which fills the gap of impedance analysis of the DPC based converters and provides a basis for studying the corresponding grid-integration stability problems. Since there is no need for PLL and Park transformation, the impedance matrix is built directly using the αβ reference frame and features symmetrical characteristics. The proposed impedance matrix can be transformed into a positive-sequence impedance and analyzed by using SISO Nyquist criteria. The stability of a weak-grid connected VSC using DPC is analyzed in this paper. The main factors affecting system stability, including the grid and control parameters, are considered in the analysis. The effectiveness of the proposed method is demonstrated by the simulations carried out in the Matlab/Simulink Simscape Power Systems as well as a hardware-in-loop system.
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