Advance control of Dual Active Bridge Multilevel Inverter (DABMI) with Open Winding Transformer (OWT) model

In recent years, Renewable Energy Sources (RES) are used to fulfil the growing demand for energy. The integration of RES into the grid incorporates power electronic converters for energy conversion. Voltage unbalance is one of the typical adverse grid disturbances commonly encountered in RES. Power quality (PQ) issues have turned out to be major problem and become extra prominent for users from all levels of usage as more nonlinear equipment are connected to the power grid. Using efficient energy conversion topologies by itself is inadequate in controlling system performance. In order to maintain and increase the system stability and reliability, Model Predictive Control (MPC) has been designed for Direct Power Control (DPC) namely Model Predictive Direct Power Control (MPDPC) which improves the PQ referral detection and reduces power ripple. Conservative Power Theory (CPT) has recently emerged to introduce new concepts concerning the definition of power and current terms. Consequently, this study proposed MPDPC of Dual Active Bridge Multilevel Inverter (DABMI) for grid connected application which incorporate the concept of CPT. The objectives of the proposed control approach is to improve the system performance during various conditions specifically for balanced and unbalanced grid voltage condition with two different cases of topology, namely DABMI and DABMI, with floating capacitor voltage. The ultimate goal of this study is to establish an advanced controller using MPDPC based CPT concept which improves steady state, transient state, Total Harmonic Distortion current (THDi) and lessens the power ripple. The complete DABMI along with the proposed MPDPC based CPT have been modeled in Matlab Simulink software and compared with the conventional and improved MPDPC. The simulation results show that the proposed approach manages to improve the system performance to achieve constant active and reactive power and at the same time produce the sinusoidal current under unbalanced testing condition with 0.56% of THDi for asymmetric DABMI topology and 1.12% of THDi for floating capacitor DABMI topology; those are below 5%, which is within the IEEE 519 standard

Takagi-Sugeno fuzzy perpose as speed controller in indirect field oriented control of induction motor drive

This paper deal with the problem in speed controller for Indirect Field Oriented Control of Induction Motor. The problem cause decrease performance of Induction Motor where it widely used in high-performance applications. In order decrease the fault of speed induction motor, Takagi- Sugeno type Fuzzy logic control is used as the speed controller. For this, a model of indirect field oriented control of induction motor is built and simulating using MATLAB simulink. Secondly, error of speed and derivative error as the input and change of torque command as the output for speed control is applied in simulation. Lastly, from the simulation result overshoot is zero persent, rise time is 0.4s and settling time is 0.4s. The important data is steady state error is 0.01 percent show that the speed can follow reference speed. From that simulation result illustrate the effectiveness of the proposed approach

Predictive direct power control for dual-active-bridge multilevel inverter based on conservative power theory

This paper explores the feasibility of multilevel dual-active bridge-inverter (DABMI) applications for grid-connected applications of a modern Model of Predictive Direct Power Control (MPDPC) based on the conservative power theory (CPT). In the case of unbalanced grid voltages, the objective of the study is to promote continued active and reactive energy in MPDPC without reducing effciency such as transient response and current harmonics. The nature of the instantaneous p-q theory permits only one out of three control targets to be fulfilled. The proposed control approached directly regulates the instantaneous active and reactive power to achieve three particular control objectives namely sinusoidal and symmetrical grid current, cancelling twice of fundamental grid frequency reactive power ripples, and removing twice grid frequency active power ripple. The techniques of complicated Grid part sequence extraction are unnecessary and improved at no extra expense, as is the case with current MPDPC fault-tolerant approaches. The instantaneous power at the next sampling instant is predicted with the newly developed discrete-time model. Each possible switching state will then be evaluated in the cost function defined until the optimal state which lead to the minimum power errors is determined. In MATLAB/Simulink simulation, the proposed CPT-based MPDPC measures reliability and performance at balanced and unbalanced grid voltages then compared with the conventional and existing MPDPC The proposed method manages to achieve all of three control targets which generates sinusoidal grid currents and attenuates active and reactive power ripple of twice the grid frequency exactly at the same time without losing its critical effciency including transient reaction and current harmonics

Predictive direct power control for dual-active-bridge multilevel inverter based on conservative power theory

This paper explores the feasibility of multilevel dual-active bridge-inverter (DABMI) applications for grid-connected applications of a modern Model of Predictive Direct Power Control (MPDPC) based on the conservative power theory (CPT). In the case of unbalanced grid voltages, the objective of the study is to promote continued active and reactive energy in MPDPC without reducing efficiency such as transient response and current harmonics. The nature of the instantaneous p-q theory permits only one out of three control targets to be fulfilled. The proposed control approached directly regulates the instantaneous active and reactive power to achieve three particular control objectives namely sinusoidal and symmetrical grid current, cancelling twice of fundamental grid frequency reactive power ripples, and removing twice grid frequency active power ripple. The techniques of complicated Grid part sequence extraction are unnecessary and improved at no extra expense, as is the case with current MPDPC fault-tolerant approaches. The instantaneous power at the next sampling instant is predicted with the newly developed discrete-time model. Each possible switching state will then be evaluated in the cost function defined until the optimal state which lead to the minimum power errors is determined. In MATLAB/Simulink simulation, the proposed CPT-based MPDPC measures reliability and performance at balanced and unbalanced grid voltages then compared with the conventional and existing MPDPC The proposed method manages to achieve all of three control targets which generates sinusoidal grid currents and attenuates active and reactive power ripple of twice the grid frequency exactly at the same time without losing its critical efficiency including transient reaction and current harmonics