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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...
In this paper, two cascaded electrodynamic shakers are supplied by the three-leg inverter. The conventional comparator-based pulse width modulation (PWM) has limited output voltage region due to the common leg. To enlarge the output voltage region and improve the inverter efficiency, the novel multi-dimensional feedback quantized modulation (MDFQM) is used. All the control algorithms are implemented...
The impedance modeling of modular multilevel converters (MMCs) is a prerequisite for applying the impedance-based stability analysis method to an MMC-based high-voltage direct current (MMC-HVDC) transmission system. The objective of this paper is to develop impedance models of a three-phase MMC in order to assess its stability. The analytical ac-side and dc-side impedance models of the three-phase...
This paper presents the synchronous operation of a novel generator termed as the rotating power electronic brushless doubly-fed induction generator (RPE-BDFIG). It is shown that the generator operates well at the synchronous speed of the main machine, delivering the desired power to the grid. Furthermore, it is illustrated that the RPE-BDFIG behaves similar to a synchronous generator in the synchronous...
In this paper a robust predictive current control approach is developed to tackle the impacts of parameter variation in induction motors on the control performance. The robustness can be achieved in general model predictive control (MPC) by integrating the disturbance into the prediction model, which is estimated by an observer and whose effect is compensated to the system input or output. In such...
This paper presents a direct phase current controller for a two phase synchronous machine. Firstly, the machine is modelled in three domains : the electrical domain, the electromagnetic domain and the mechanical domain. Secondly, a linearised model is deduced for the RS controller coefficient determination. The performance is enhanced with the introduction of a model observer to compensate the system...
This work investigates current control of an isolated bidirectional Phase-Shifted (PS) Dual Active Bridge (DAB) DC-DC converter (270V/28V, 5kW), for an energy storage application based on a 28V Li-Ion Battery. Two control strategies are investigated. First, a nonlinear average-model-based Sliding Mode Controller (SMC) is developed. Then, a model-less Fuzzy Control (FC) is presented and proven to be...
In this paper an improved current mode control for a three-phase rectifier is presented which is able to compensate the line currents under unbalanced operation of the supplied grid voltage. Instrumental for the controller design is the computation of the current reference, where, the key point is the use of the positive-sequence of the grid voltage to construct it. The control scheme is designed...
A discrete-time current controller is presented for the current loop of the permanent magnet synchronous motor drives. Firstly, the difference equations of current errors are obtained for constant reference values. Then, a dead-beat controller is designed to drive the dq-axes currents to the desired values. Discrete-time integral action with an anti-windup scheme is added to the dead-beat structure...
The grid connected photovoltaic (PV) system have been modeled and simulated using control algorithm with dedicated PI control for dc link voltage regulation. Generally, the PI controller used for the system is tuned using trial and error method but this method is having manual limitation for the tuning of controller so as to obtain the desired response like as regulating dc link voltage to reference...
This paper proposes a sensorless vector control method based on Primary flux linkage and sinusoidal current tracking control for Interior permanent magnet synchronous motor. The proposed sensorless vector control can control torque at different speeds. Furthermore, the proposed sensorless vector control method estimates the primary flux linkage vector. At various speeds, it is possible to control...
Control of the circulating current in the modular multilevel converter (MMC) is one of the major tasks for the proper operation of the converter topology. This paper develops a controller for the circulating current of the MMC that utilises the redundant voltage levels in 2N+1 modulated MMCs in order to regulate the current to its reference. The main advantages of the approach are the elimination...
Energy efficiency and size reduction are crucial in modern power electronic converters where more energy saving and less volume of power converters are desired simultaneously. This paper will aim to propose efficient and compact boost-inverter operating at 200 kHz based on the Silicon Carbide (SiC) power switching devices. The boost-inverter using SiC power switches instead of Si devices will result...
Zero steady state error in the line current of a single-phase grid-connected voltage source converter is usually obtained in the synchronous reference frame with different orthogonal signal generation schemes, which may lead to slow dynamic response and stability problems. This paper analyzes a simple rotating reference frame current control of the single-phase converters using the desired steady...
This paper analyses the behaviour of grid connected modular multilevel converter, under pulsed load at the DC side. The goal is to achieve minimum AC power fluctuation despite high power fluctuation on the DC side. Pulsed load causes imbalances of cell capacitor voltages, and this effect is analytically described. The control methodology, together with an algorithm for capacitor voltage balancing...
The modular multilevel converter (MMC) with cascaded full bridge cells is available for a utility interactive inverter and AC/AC transmission system without transformers in high voltage line. When it is interconnected with power line, it is possible to control the active power flow in order to supply or charge the power in the line. This research applied a Hexagonal type MMC (H-MMC) to 3-phase AC-AC...
Most diagnostic techniques in the literature focus on the occurrence of a single fault, which limits their functionality. This paper presents a real-time diagnostic algorithm for multiple IGBT open-circuit faults in three-level Neutral-Point-Clamped converters. The proposed algorithm is based on an indirect analysis of the converter pole voltage errors and requires no additional sensors, relying only...
Cascade H-bridge multilevel inverter is a best candidate for static VAr compensation in medium and high voltage applications. The topology consists of several capacitors to provide dc link voltage support for H-bridge inverters. Regulation of the dc link voltages at the required levels is a major research challenge in VAr compensated inverters. This paper presents a novel and simple control strategy...
The system resonance frequency of a grid connected inverter with LCL filter depends on the filter parameters and the time varying grid impedance. To obtain stability and to preserve good dynamic behavior of the system, grid impedance adaptation of the current controller is proposed. The design of the current controller is described and the adaptation strategy to prevent the excitation of the system...
This paper presents a small-scale hybrid energy storage system (HESS) that combines ultracapacitors and lead-acid batteries. It also comprises a controllable DC power source and a power resistor, as well as the bidirectional DC-DC converters to interface the different elements with a common DC bus. The system is designed for performance analysis, modeling and control validation purposes. The design...
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