scholarly journals Simulation Study of Nonlinear PI-Controller with Quasi-Z-Source Derived Push-Pull Converter

2013 ◽  
Vol 4 (1) ◽  
pp. 26-31
Author(s):  
Andrii Chub ◽  
Oleksandr Husev ◽  
Dmitri Vinnikov
Keyword(s):  
Control System ◽  
Output Voltage ◽  
Renewable Energy Sources ◽  
Stability Margin ◽  
Input Voltage ◽  
High Gain ◽  
Pi Controller ◽  
Stable Operation ◽  
Loop Control ◽  
Wide Range

Abstract This paper is focused on the control issues of the quasi-Z-source derived push-pull converter with integrated magnetic elements. The proposed converter is intended for applications that require a high gain of the input voltage and galvanic isolation, i.e. power conditioning systems for renewable energy sources, such as variable speed wind turbines with direct driven permanent magnet synchronous generators. Magnitude and frequency of the output voltage of such turbines are variable due to intermittent nature of the wind power. Despite number of advantages converter has complicated dynamic behavior. Simulations showed change of stability margin depending on current operation point of the wind turbine and output load. Closed loop control system should provide fast response and stable operation in the wide range of wind speeds. Simulations showed that the conventional PI-controller with saturation cannot satisfy those requirements. Nonlinear PI-controller was derived by adding adjustment block to the conventional PI-controller. Adjustment block is drastically changing proportional and integral gains of the controller according to sign of the output voltage error. Proposed controller is compared with conventional one by means of simulation in PSIM. Simulation results prove that proposed nonlinear control system has improved regulator performance.

Single Switched Non-isolated High Gain Converter

2017 ◽  
Vol 8 (1) ◽  
pp. 20
Author(s):  
Lopamudra Mitra ◽  
Ullash Kumar Rout
Keyword(s):  
Pid Controller ◽  
Output Voltage ◽  
Renewable Energy Sources ◽  
State Space Model ◽  
High Gain ◽  
Loop Control ◽  
Space Model ◽  
High Voltage Gain ◽  
Constant Output ◽  
Close Loop Control

<p>This paper presents a new single switched inductor- capacitor coupled transformer-less high gain DC-DC converter which can be used in renewable energy sources like PV, fuel cell in which the low DC output voltage is to be converted into high dc output voltage. With the varying low input voltages, the output of DC-DC converter remains same and does not change. A state space model of the converter is also presented in the paper. This constant output voltage is obtained by close loop control of converter using PID controller. High voltage gain of 10 is obtained without use of transformer. All the simulations are done in MATLAB-SIMULINK environment.</p>

scholarly journals Active Switched Capacitor Network in High Gain DC-DC Converter with PI Controller

2020 ◽  
Vol 9 (5) ◽  
pp. 969-973
Keyword(s):  
Comparative Analysis ◽  
Output Voltage ◽  
Input Voltage ◽  
High Gain ◽  
Pi Controller ◽  
Performance Comparison ◽  
Switched Capacitor ◽  
Voltage Gain ◽  
Voltage Stress ◽  
Base Network

In this paper, PI controller in the active switched capacitor network is employed to achieve robust control under disturbance by maintaining sustained output voltage for varying input voltage. Active switched capacitor in the high gain DC–DC circuit efficiently increases voltage gain due to the combination of LC network with minimum duty cycle. The proposed circuit is the modification of typical high gain DC converter and modified network is simple in structure due to reduce in number of switch components and the voltage stress on the capacitor, diodes and across switches are reduced compared to base network. This paper presents the design, operation and analysis of the modified topology and the performance comparison with base converter is presented. Simulation is carried out using MATLAB software for the proposed system with and without PI controller and variation in the output voltage between both the circuits is tabulated and comparative analysis is discussed.

A High Step-up DC-DC Converter Based on the Voltage Lift Technique for Renewable Energy Applications

2021 ◽  
Vol 13 (19) ◽  
pp. 11059
Author(s):  
Shahrukh Khan ◽  
Arshad Mahmood ◽  
Mohammad Zaid ◽  
Mohd Tariq ◽  
Chang-Hua Lin ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Common Ground ◽  
Closed Loop ◽  
Low Voltage ◽  
Renewable Energy Sources ◽  
Input Voltage ◽  
High Gain ◽  
Boost Converter ◽  
Open Loop ◽  
Voltage Gain

High gain DC-DC converters are getting popular due to the increased use of renewable energy sources (RESs). Common ground between the input and output, low voltage stress across power switches and high voltage gain at lower duty ratios are desirable features required in any high gain DC-DC converter. DC-DC converters are widely used in DC microgrids to supply power to meet local demands. In this work, a high step-up DC-DC converter is proposed based on the voltage lift (VL) technique using a single power switch. The proposed converter has a voltage gain greater than a traditional boost converter (TBC) and Traditional quadratic boost converter (TQBC). The effect of inductor parasitic resistances on the voltage gain of the converter is discussed. The losses occurring in various components are calculated using PLECS software. To confirm the performance of the converter, a hardware prototype of 200 W is developed in the laboratory. The simulation and hardware results are presented to determine the performance of the converter in both open-loop and closed-loop conditions. In closed-loop operation, a PI controller is used to maintain a constant output voltage when the load or input voltage is changed.

scholarly journals Modeling, Design Procedure and Control of a Low-Cost High-Gain Multi-Input Step-Up Converter

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1424
Author(s):  
Edgardo Netzahuatl ◽  
Domingo Cortes ◽  
Marco A. Ramirez-Salinas ◽  
Jorge Resa ◽  
Leobardo Hernandez ◽  
...  
Keyword(s):  
Nonlinear Model ◽  
Low Cost ◽  
Renewable Energy Sources ◽  
Design Procedure ◽  
Input Voltage ◽  
High Gain ◽  
Grid Systems ◽  
Real Behavior ◽  
Different Characteristics ◽  
And Control

The use of several different sources to feed a load jointly is convenient in many applications, in particular those where two or more renewable energy sources are employed. These applications include energy harvesting, hybrid vehicles, and off-grid systems. A multi-input converter able to admit sources of different characteristics and select the output power of each source is necessary in such applications. Several topologies of multi-input converters have been proposed to this aim; however, most of them are controlled by simple strategies based on a small signal model of multi-input converters. In this work, a low cost high gain step-up multi-input converter is analyzed. A nonlinear model is derived. Using this model, a detailed design procedure is proposed. A 500 W converter prototype was constructed to confirm that the model predicted the real behavior of the converter. Using the nonlinear model, indirect voltage control of basic converters was extended to the multi-input converter. The obtained controller had a fast performance, and it was robust under load and input voltage variations. With the obtained model, the proposed design procedure, and the controller, a converter that was initially proposed for photovoltaic applications was enabled to be used in a broader range of applications. The herein exposed ideas for modeling, the design procedure, and control could be also applied to other multi-input converters.

scholarly journals Vertical Axis Wind Turbine Improvement using DC-DC Boost Converter

2020 ◽  
Vol 188 ◽  
pp. 00017
Author(s):  
Khairunnisa Khairunnisa ◽  
Syaiful Rachman ◽  
Edi Yohanes ◽  
Awan Uji Krismanto ◽  
Jazuli Fadil ◽  
...  
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Output Voltage ◽  
Vertical Axis ◽  
Input Voltage ◽  
Pi Controller ◽  
Boost Converter ◽  
Oxide Semiconductor ◽  
Vertical Axis Wind Turbine ◽  
Constant Output

Vertical axis wind turbine (VAWT) can be operated in any direction of wind speed, but it has low rotation. To improve the performance of VAWT in which low rotation, this paper presents a simple control strategy of VAWT using a DC-DC boost converter to tap constant voltage in a standalone application. The main objective of this research is to maintain a constant output voltage of converter despite variation input voltage affected by variable wind speed. A simple proportional-integral (PI) controller has been used for a DC-DC boost converter and tested in MATLAB-Simulink environment, with the closed-loop system of the converter maintain constant output voltage although the wind speed is kept changing. The PI controller obtains the feedback from the output voltage of the boost converter to produce the correct pulse width modulation (PWM) duty cycle and trigger the metal oxide semiconductor field effect transistor (MOSFET) following the reference voltage of the turbine. This system has suppressed the value of overshoot and increased the efficiency of wind turbines as 34 %.

PI Controller Design for DFIG Wind Power Generation System RSC Based on PSO Algorithm

2014 ◽  
Vol 508 ◽  
pp. 196-199
Author(s):  
Yi Min Chu ◽  
Wu Wang
Keyword(s):  
Control System ◽  
Controller Design ◽  
Good Control ◽  
Pso Algorithm ◽  
Pi Controller ◽  
Current Loop ◽  
Control Effect ◽  
Loop Control ◽  
Stator Flux ◽  
Rotor Side Converter

PID controller has widely used in control system for its simple structure, good control effect and strong robustness, the PI control strategy was introduced into rotor side converter of DFIG control with the mathematical models and the structure of stator flux-oriented vector control. Particle swam optimization algorithm was a new random optimization technology which has the features of rapid calculation speed. The PI controller design for RSC current loop and speed loop control was analyzed, and the PSO algorithm was presented for PI controller design, the simulation experiments demonstrated that the algorithm was suitable for the RSC control system with PSO remarkable search capability.

scholarly journals Design and Analysis of Single Switch Transformer Less DC-DC Converter with Universal Input Voltage for Fuel Cell based Vehicles

2021 ◽  
pp. 1262-1272
Author(s):  
R. Birundha ◽  
Dr. P. Maruthapandi
Keyword(s):  
Fuel Cell ◽  
Output Voltage ◽  
Common Ground ◽  
Life Time ◽  
Input Voltage ◽  
High Gain ◽  
Voltage Gain ◽  
Voltage Drops ◽  
Solar Powered ◽  
Output Characteristics

A new single switch solar powered high gain step-up DC-DC converter is proposed for plug-in hybrid battery charger in Electric vehicle (EV). The proposed topology utilizes a L2C3D2network to obtain high voltage gain and reduce the voltage stress on the power switch. Additionally, the proposed converter has a universal input voltage in order to suit the soft output characteristics of the fuel cell. The fuel cell has a relatively low output voltage and high current, and it has soft output characteristics as its output voltage drops as the output current increases. Therefore, the fuel cell cannot be directly interfaced to the dc-link bus (400V) of the inverter inside the EV. This dc-dc converter has a universal input voltage feature with wide voltage gain range to suit the soft output characteristics of the fuel cell. Additionally, this dc-dc converter has to have low input current ripple to prolong the life time of the fuel /solar cell, and a common ground between its input and output ports to avoid additional EMI and maintenance safety problem. This control strategy is modelled and simulated using MATLAB -Simulink. A proto type experimental has been fabricated and tested. The experimental analysis was done and the results are in line with the simulation results.

scholarly journals AC-AC voltage regulation by switch mode PWM Cûk voltage controller with improved performance

2021 ◽  
Author(s):  
Palash K. Banerjee
Keyword(s):  
Output Voltage ◽  
Supply Voltage ◽  
Input Voltage ◽  
Voltage Regulation ◽  
Control Circuit ◽  
Voltage Regulator ◽  
Error Signal ◽  
Constant Voltage ◽  
Wide Range ◽  
Switching Devices

In this research project, an AC Cûk voltage regulator has been proposed for maintaining constant voltage across the load during wide range of input voltage fluctuations. The proposed AC Ck voltage regulator made of practical IGBT switches has been investigated for both manual and automatic control circuit. A fraction of the output voltage is taken as the input voltage of the control circuit and produce the error signal if any changes occur in the output voltage. The modified error signal is used to make PWM signals for switching devices as per output voltage of regulator. The PWM controls the ON/OFF time (Duty cycle) of switching devices (IGBTs) of the proposed regulator. As a result the regulator is maintaining a constant voltage across the load during any change in supply voltage. The simulation waveforms and the calculated total harmonics distortion (THD) values are compared with previously studied AC Buck-Boost regulator. The observed simulated waveforms of output voltage, output current and input current and THD values have been improved in case of proposed AC Cûk voltage regulator.

The Design and Implementation of a PLC Based Gas Turbine Controller for a Shipboard Application

2000 ◽  
Author(s):  
Vincent P. Tolotta
Keyword(s):  
Control System ◽  
Gas Turbine ◽  
Low Cost ◽  
Flat Panel Display ◽  
Flat Panel ◽  
Loop Control ◽  
Steady State Operation ◽  
Power Turbine ◽  
Wide Range ◽  
Supervisory Control System

A paper will be presented describing the design and development of the Gas Turbine Local Controller replacement used on the Magnetic Minesweeping Gas Turbine Generator (MMGTG) on the US Navy MCM-1 Class of ships. The advent of processor based controllers including PLCs has provided a low cost alternative for control system upgrades when faced with increasing maintenance costs and obsolescence issues of analog and hard relay logic control systems. The replacement controller is a Programmable Logic Controller (PLC) based system linked to a flat panel display and a supervisory control system. A MMGTG during pulsing operations applies a severe load transient cycle to the gas turbine for the fuel control to meet in a stable and safe manner. The algorithms which employ an adaptive Proportional Integral Derivative (PID) loop control structure with internal limiting constraints based on engine state are used to manage these transients, power turbine entry temperature and a wide range of steady state operation. The controller includes logic for alarming, start/stop and automatic shutdown. The design of the hardwired automatic shutdown logic integrated to the PLC will be presented. The control system design will be described in terms of its integration to a supervisory network, local control functionality and shipboard considerations. The Human Machine Interface screens of the flat panel display and their design are also considered.

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