In this paper, a fixed-frequency pulsewidth modulation (PWM) based on sliding-mode current controller is designed and applied to a utility interface three-phase/wire/level neutral-point-clamped inverter. The proposed design methodology of the sliding-mode control is based on a constant switching frequency operation and on Gao’s reaching law that allows chattering compensation. The aim of the controller is to inject a controlled active power from renewable energy sources into the grid while controlling the power factor and minimizing supply current harmonics. Moreover, the dc-link voltages across the split capacitors are controlled with a simple proportional–integral (PI) regulator. Experimental results show the advantages of the proposed control algorithm in terms of fast dynamic response, low voltage ripple on the dc bus, low current Total Harmonic Distortion, and robustness toward external perturbations from the dc and ac sides; moreover, a comparison with a PWM–PI current controller is presented.

/pdf/sliding-mode-fixed-frequency-current-controller-design-for-3dkj0ssbs9.pdf

Sliding Mode Fixed Frequency Current Controller Design for Grid-Connected NPC Inverter

This paper presents an approach to Direct Power Control (DPC) of a three-phase grid connected three level neutral-point clamped inverter. The presented approach can be extended to other topologies of multilevel inverters. The proposed DPC strategy is based on the Sliding Mode Control (SMC). The active and reactive power are directly controlled by three-level inverter switching states using the value of the delivered power error calculated from previous samples of three phase voltages and currents. An optimal control vector defined in dq reference frame minimizing the ripple is obtained using predicted values of three phase currents. An appropriate switching sequence is generated for each optimal vector using direct and indirect way. In the direct way the switching vector the nearest to the optimal control vector, and the direct way uses space vector modulation. The proposed strategy is robust to system parameters variations. The major advantage of proposed approach is its simple analog/digital control implementation. Moreover, PID controllers, look-up tables, and pulse-width modulators are not necessary. The designed control system is tested on a simulation model of a three-level neutral-point clamped multilevel inverter. Simulation results of a three-level neutral-point clamped multilevel inverter topology confirm the design aims.

A sliding mode based direct power control of three-phase grid-connected multilevel inverter

This paper presents an alternative closed-loop control strategy approach of back to back two-level voltage source converter to regulate the dc link voltage. Both rotor speed of the Permanent Magnet Synchronous Generator (PMSG) side and the DC-link voltage of load side are controlled by a PI controller. Modeling and simulation of the control structure has been carried out using PLECS toolbox on Matlab/Simulink environment. PLECS is a software package for modeling and simulating dynamic systems. It is preferable for high-speed simulations of circuit-oriented electric and electronic systems. The validity and performance of the proposed control scheme has been verified by simulation results and is in agreement with what is expected. The simulation results demonstrate that the controller is capable of maintaining constant dc-link voltage under dynamic and steady-state performance of the system.

Closed loop control strategy of back to back PWM converter fed by PMSG using PLECS toolbox on Matlab/Simulink for wind energy application

This paper presents a novel Direct Power Control strategy for a three-phase grid connected multilevel inverter. The proposed DPC strategy combines discrete-time sliding mode control and predictive control. The active and reactive power are directly controlled by inverter switching states, represented by a switching vector, using the value of the power error computed from samples of phase voltages and currents. An appropriate switching vector is selected for each sampling period to minimize average value of the switching functions on the time interval on three sampling periods. The prediction of phase voltages and currents is necessary for algorithm implementation. The switching frequency is constant, and the digital control implementation is simple. The designed control system is tested using a simulation model of a three-level neutral-point clamped multilevel inverter. Simulation results confirm the design aims.

https://ieeexplore.ieee.org/iel7/6619586/6635569/06635736.pdf

Discrete-time sliding mode direct power control for three-phase grid connected multilevel inverter

This paper investigates the sliding mode control of three-phase voltage source PWM rectifier (VSR). When the three-phase VSR system is applied in different environmental conditions, external disturbances are inevitable and stochastic, so these conditions should be taken into consideration when designing the controllers. To have a good performance and a fast response, the whole closed loop control is designed in two parts: outer voltage loop control and inner current loop control, to achieve the aim of well controlled output dc-bus voltage, sinusoidal input currents at AC mains, controlled power factor and bidirectional power flow, etc. Simulation results are given to demonstrate the effectiveness of the proposed control method and it is in good agreement with the desired control performance. Therefore, the proposed sliding mode control in this paper presents new insights concerning the control of three-phase VSR in the presence of uncertainties and external disturbances and hence has a wide range of applications with good robustness.

Robust sliding mode control of three-phase voltage source PWM rectifier with uncertainties and disturbances

The back-to-back PWM converter based on direct power control for variable frequency induction motor drive is studied in order to achieve four-quadrant operation, eliminate grid side harmonic pollution and to improve dynamic response. The proposed scheme is modeled and simulated in MATLAB/ SIMULINK environment. Simulation shows that the proposed scheme has better steady-state characteristics and faster transient response compared with its counterpart-the direct current control scheme.

Study on back-to-back PWM converter based on direct power control for induction motor drive

A direct power control (DPC) scheme for three-phase PWM rectifier based on sliding-mode variable structure control theory is presented Compared with the traditional PI controller, the proposed scheme is much more robust with better transient performance, lower total harmonic distortion (THD) and simpler tuning of parameters Modeling and simulation done in MATLAB/SIMULINK environment shows that the proposed scheme is superior to traditional PI controller

A direct power control scheme for three-phase PWM rectifiers based on sliding-mode variable structure control theory

In this paper, the linear mathematical model of three phase Voltage Source Rectifier (VSR) in d-q coordinates is deduced based on the power balance equation and decoupled state-feedback control method. An improved control strategy using current inner loop with state feedback decoupling, voltage square outer loop and SVPWM modulation is proposed. Nonlinear input transformation is used to derive a linear model from the original nonlinear model. The advantages of the proposed scheme include accurate controller design, fast dynamic response and high quality of current and voltage waveforms. SVPWM modulation can reduce the total harmonic distortion (THD) of the grid side current. The whole system is modeled and simulated by using the MATLAB/SIMULINK software. Simulation results shows that the proposed PWM model can give satisfactory steady-state characteristics and fast transient response, and it is simple to tune parameters.

An Improved Feedback Linearizing Control Scheme for Three-Phase Voltage-Type PWM Rectifier

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Papers

Study on back-to-back PWM converter based on direct power control for induction motor drive

A direct power control scheme for three-phase PWM rectifiers based on sliding-mode variable structure control theory

An Improved Feedback Linearizing Control Scheme for Three-Phase Voltage-Type PWM Rectifier