Design and Control of a Grid-connected Seven Level Inverter for Photovoltaic Applications

This paper presents the design and closed-loop current control of a grid connected seven-level, 3-phase diode-clamped multilevel inverter for Photovoltaic (PV) applications. The proposed closed loop current control technique is based on the voltage-oriented proportional integral (PI) controller theory. The modulation technique used is level-shifted-carrier sinusoidal pulse width modulation (SPWM). The gain values of PI controller were selected to achieve good current quality and dynamic response. Grid synchronization was achieved by using a synchronous-reference frame phase-locked loop (SRF-PLL). Matlab/Simulink was used for the control system design and simulation. The simulation results show that a 1.34% total harmonic distortion (THD) of the output current was achieved which is within the allowable current distortion limits by international standards. The stability of the system was analyzed using pole-zero mapping and root locus.

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Implementation of Single-Phase Two-Switch Midpoint Unidirectional Multilevel Converter System

International Journal of Emerging Electric Power Systems ◽

10.1515/ijeeps-2017-0151 ◽

2018 ◽

Vol 19 (4) ◽

Author(s):

Peethala Rajiv Roy ◽

P. Parthiban ◽

B. Chitti Babu

Keyword(s):

Single Phase ◽

Pulse Width Modulation ◽

Low Voltage ◽

Supply Voltage ◽

Harmonic Distortion ◽

Input Voltage ◽

Open Loop ◽

Current Control ◽

Control Technique ◽

Control Scheme

Abstract This paper deals with implementation of a single-phase three level converter system under low voltage condition. The frequency of the switches is made constant and involves change in ${t_{on}}$ and ${t_{off}}$ duration. For this condition the pulse width modulation control scheme for a single phase three level rectifier is developed to improve the power quality. The hysteresis current control technique is adopted to bring forth three-level PWM on the dc side of the bridge rectifier and to achieve high power factor and low harmonic distortion. Based on the proposed control scheme, the line current is driven to follow the sinusoidal current command which is in phase with the supply voltage. By using three-level voltage pattern the blocking voltage of each power device is clamped to half of the dc link voltage. The simulation and experimental results of 20W converter under low input voltage condition are shown to verify the circuit performance. Open loop simulation and hardware tests are implemented by applying a low voltage of 15 V(rms) on the input side.

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Design and Simulation of Closed Loop Proportional Integral (PI) Controlled Boost Converter and 3-phase Inverter for Photovoltaic (PV) Applications

Al-Khwarizmi Engineering Journal ◽

10.22153/kej.2019.06.001 ◽

2019 ◽

Vol 15 (1) ◽

pp. 10-22

Author(s):

Riadh Adnan Kadhim

Keyword(s):

Closed Loop ◽

Pulse Width Modulation ◽

Harmonic Distortion ◽

Pi Controller ◽

Boost Converter ◽

Solar Panel ◽

Current Output ◽

Phase Inverter ◽

Proportional Integral ◽

Mathematical Equations

This research deals with the design and simulation of a solar power system consisting of a KC200GT solar panel, a closed loop boost converter and a three phase inverter by using Matlab / Simulink. The mathematical equations of the solar panel design are presented. The electrical characteristics of the panel are tested at the values of 1000 for light radiation and 25 °C for temperature environment. The Proportional Integral (PI) controller is connected as feedback with the Boost converter to obtain a stable output voltage by reducing the oscillations in the voltage to charge a battery connected to the output of the converter. Two methods (Particle Swarm Optimization (PSO) and Zeigler- Nichols) are used for tuning PI controller to enhance the overall performance of the system. The Sine Pulse Width Modulation (SPWM) technique was used to obtain a pure 3-phase in low distortion. The voltage and current output values of ± 14V and ± 2.8A are obtained, and the Total Harmonic Distortion (THD) value is 4.20%.

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Design and control technique for single phase bipolar H-bridge inverter connected to the grid

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v10i3.pp3057-3065 ◽

2020 ◽

Vol 10 (3) ◽

pp. 3057

Author(s):

Linda Hassaine ◽

Mohamed Rida Bengourina

Keyword(s):

Pulse Width Modulation ◽

Harmonic Distortion ◽

Current Control ◽

Digital Design ◽

Control Technique ◽

Pv System ◽

System A ◽

Digital Pulse ◽

And Control ◽

Xilinx Fpga

The power quality injected into the grid and the performance of the converter system depend on the quality of the inverter current control. This paper proposes a design and control technique for a photovoltaic inverter connected to the grid based on the digital pulse-width modulation (DSPWM) which can synchronise a sinusoidal output current with a grid voltage and control a power factor. The current injected must be sinusoidal with reduced harmonic distortion. The connected PV system is based on H-Bridge inverter controlled by bipolar PWM Switching. The current control technique and functional structure of this system are presented and simulated. Detailed analysis, Simulations results of output voltage and current waveform demonstrate the contribution of this approach to determinate the suitable control of the system. A digital design of a generator PWM using VHDL is proposed and implemented on an Xilinx FPGA and it has been validated with experimental results. As a result, the proposed inverter implementation is simple, and it becomes an attractive solution for low power grid connected applications.

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Adaptive Fuzzy PI Current Control of Grid Interact PV Inverter

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v8i1.pp472-482 ◽

2018 ◽

Vol 8 (1) ◽

pp. 472 ◽

Cited By ~ 1

Author(s):

R.S. Ravi Sankar ◽

S.V. Jayaram Kumar ◽

G. Mohan Rao

Keyword(s):

Power Generation ◽

Pulse Width Modulation ◽

Fuzzy Controller ◽

Pi Controller ◽

Current Control ◽

Reference Voltage ◽

Voltage Source ◽

Pv Inverter ◽

Photo Voltaic ◽

Pv Power Generation

Now a day‟s, Photo Voltaic (PV) power generation rapidly increasing. This power generation highly depending on the temperature and irradiation. When this power interface with grid through the voltage source inverter with PI controller. Its gains should be updated due to the parametric changes for the better performance. In This Work Fuzzy Controller updates the gains of the proportional integral (PI)s Controller under variable parametric conditions. the gaines of the PI Controller are updated based on the error current and change in error current through the fuzzy controller. The error current in direct and quadrature frame are the Inputs to the PI controller. The PI Controller generates the reference voltage to the pulse width modulation technique. Here reference voltage is compared with the carrier signal to generate the pulses to the 3-Ph Inverter connected to the grid. This controller has given well dynamic response with less steady state error and also given The less THD of the grid current compared to the PI and Fuzzy controller.It Is implemented and verified in MATLAB Simulink.

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A New Bidirectional Three-phase Neutral Point Clamped (NPC) Grid-Connected Converter: Analysis and Simulation

10.48011/sbse.v1i1.2202 ◽

2021 ◽

Author(s):

Christel E. G. Ogoulola ◽

Angelo J. J. Rezek ◽

Robson B. Gonzatti ◽

Vinicius Z. Silva ◽

Marcos L. Ramos ◽

...

Keyword(s):

Pulse Width Modulation ◽

Analog Circuit ◽

Harmonic Distortion ◽

Simple Algorithm ◽

Unit Vector ◽

Theoretical Development ◽

Electrical Network ◽

Synchronous Reference Frame ◽

Three Phase ◽

Bus Voltage

This paper deals with the theoretical development, analysis, and simulation of the new topology of three-phase NPC (Neural Point Clamped) converter. The proposed 6-kW three-phase converter is connected to a three-phase electrical network and due to its bidirectional characteristics can either send energy to the grid or receive it from the grid. The classic strategy of vectorial control at the DQ synchronous reference frame, along with a simple algorithm for Unit Vector Generation (UVG), have been employed to control the line currents in the grid and the DC-bus voltage, thus substituting the PLL (Phase Locked Loop). A PWM (Pulse Width Modulation) strategy is presented in the form of an analog circuit and used for switching the semiconductors in the converter. The obtained results were verified using Matlab/Simulink software. The proposed converter has five voltage levels at the output for each phase and proven more advantageous than the conventional NPC. In addition, it was obtained a better harmonic content in the grid currents because there is very low Total Harmonic Distortion (THD) both when acting as a rectifier and as an inverter.

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Design of closed-loop current control for high power factor AC-AC SPMC

2012 IEEE International Conference on Power and Energy (PECon) ◽

10.1109/pecon.2012.6450272 ◽

2012 ◽

Cited By ~ 1

Author(s):

Mazratul Firdaus Mohd Zin ◽

Mohammad Nawawi Seroji ◽

Noraliza Hamzah

Keyword(s):

Power Factor ◽

High Power ◽

Closed Loop ◽

Current Control ◽

Loop Current ◽

High Power Factor

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Improving Performance of Three-Phase Slim DC-Link Drives Utilizing Virtual Positive Impedance-Based Active Damping Control

Electronics ◽

10.3390/electronics7100234 ◽

2018 ◽

Vol 7 (10) ◽

pp. 234 ◽

Cited By ~ 1

Author(s):

Ahmet Aksoz ◽

Yipeng Song ◽

Ali Saygin ◽

Frede Blaabjerg ◽

Pooya Davari

Keyword(s):

Pulse Width Modulation ◽

Lower Cost ◽

Permanent Magnet Synchronous Motor ◽

Harmonic Distortion ◽

Active Damping ◽

International Standards ◽

Motor Drive ◽

Damping Control ◽

Three Phase ◽

Active Damping Control

In this paper, a virtual positive impedance (VPI) based active damping control for a slim DC-link motor drive with 24 section space vector pulse width modulation (SVPWM) is proposed. Utilizing the proposed control and modulation strategy can improve the input of current total harmonic distortion (THD) while maintaining the cogging torque of the motor. The proposed system is expected to reduce the front-end current THD according to international standards, as per IEC 61000 and IEEE-519. It is also expected to achieve lower cost, longer lifetime, and fewer losses. A permanent magnet synchronous motor (PMSM) is fed by the inverter, which adopts the 24 section SVPWM technique. The VPI based active damping control for the slim DC-link drive with/without the 24 section SVPWM are compared to confirm the performance of the proposed method. The simulation results based on MATLAB are provided to validate the proposed control strategy.

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