Proportional control, in engineering and process control, is a type of linear feedback control system in which a correction is applied to the controlled variable which is proportional to the difference between the desired value set point, sp and the measured value process value, pv. In order to ensure the response characteristics of the control system and to improve the robustness, the impacts on systems characteristics and stability caused by pr controller and parameters in the innercurrent loop were analyzed via. Tuning rules for proportional resonant controllers. Tuning rules for proportional resonant controllerscontrol.
The proportional resonant controllers pr are introduced to fulfil the increased demand for controllers capable to follow or reject periodic signals with superior performance than conventional. The performance of the pr controller is u2measured based on the ability of the controller to reduce the harmonic distortion in the inverter system with nonlinear load connected at the output of the inverter. Therefore it is quite appropriate for the voltage magnitude control, as shown in fig. This product is the next generation update with enhanced features ie. The objective of the proportional integral part of the pir controller is to control the. National power electronic conference 2010 1 antiwindup. Proportional control, in engineering and process control, is a type of linear feedback control system in which a correction is applied to the controlled variable which is proportional to the difference between the desired value setpoint, sp and the measured value process variable, pv. An improved proportional quasiresonant control of wind. For more details, see the application note understanding and using llc converters to great advantage. A proportionalresonant pr controller is used for replacing the conventional proportionalintegral pi controller in this system.
This paper is describing the recently introduced proportionalresonant pr controllers and their suitability for gridconnected converters current control. A proportional resonant pr controller is used for replacing the conventional. Comparative study of pi and proportional resonant control for. Design of a proportional resonant controller with resonant. Download limit exceeded you have exceeded your daily download allowance. Fractional proportionalresonant current controllers for. Proportional resonant controller with resonant harmonic. In this article, proportional resonant pr controller.
The transfer function of the vr controller can be derived as 20 where are proportional coefficient and the integral coefficient, respectively, and is the resonant angle. The current tracking errors are greatly reduced when the quasipr controller rather than the proportionalintegration controller is applied. Mar 10, 2017 the hardware implementation is used to test the harmonic elimination using an active power filter. Design and control of proportionalresonant controller based photovoltaic power conditioning system. Design of pr current control with selective harmonic. Proportionalonly control is the simplest of the pid controller forms as it is limited to a single tuning parameter controller gain k c. The method chosen for the resonant controller parameters tuning is based on the generalized stability margin. To overcome above stated issues, we are proposing a novel proportional resonant controller, with a resonant harmonic compensator and switchtype fault current limiter stfcl as an frt strategy for grid connected pvs under normal conditions and asymmetrical faults.
Ucc24624 data sheet, product information and support. Microgrid design and control using a discrete proportional. The application research of proportional resonance control in. Pdf tuning rules for proportional resonant controllers. Proportionalresonant controllers and filters for grid. This paper presents the design approach of the proportional plus resonant control for active power filter in threephase fourwire system. This paper presents a current control technique for a singlephase gridconnected dcac inverter which is used in photovoltaic power conditioning system pv pcs. Types of controllers proportional integral and derivative.
National power electronics conference, 10 th june of 2010, roorkee. Onedimensional optimization for proportional resonant. Stability analysis of the proportionalresonant controller. A systematic method for designing a pr controller and active.
Then, aiming at suppressing forced oscillations, a novel pss with proportional. Here the controller operates on ac signal whereas in popular dq control or the synchronous reference frame based control the pi controller works on dc signal. Ghoshal, anirban and john, vinod 2010 antiwindup schemes for proportional integral and proportional resonant controller. The ucc256303 is a fully featured llc controller with integrated highvoltage gate driver. Proportional resonant current controller for 7level.
The experimental results confirm that the proportional plus resonant controller can provide good performance in dynamic load condition. This paper introduces the use of the naslin polynomial technique in order to tune a proportional integral resonant pir controller for the rotorside converter of a gridconnected wind energy conversion system wecs, which is based on a backtoback converter and a doubly fed induction generator dfig. An improved proportional resonant pr controller is adopted to achieve fast output power regulation. This paper proposes a tuning methodology for proportional resonant pr controllers by using the design philosophy of the zieglernichols forced oscillation method. Shunt active power filter based on proportional integral. Combined parameters selection of a proportional integral. Suppression of power system forced oscillations based on. In 8, a strategy of proportional integral pi regulator paralleled with a harmonic resonant r controller is introduced in the. In this chapter, the pr current controller is designed and implemented for threephase inverters, in the stationary reference frame and in. Such a controller enhances the frequency tracking behaviour of ac references with a low order transfer function in comparison with the conventional multiharmonic proportional resonant controllers. This approach will remove the need to transform the singlephase system into the rotating reference frame in dq coordinates for the pi controller. A new control approach based on proportional resonant control for grid connected current is presented in this paper. Harmonics by means of harmonic compensator hc, proportional resonant pr controller is. Proportional resonant controller the inverter is a singlephase system.
The recently introduced proportionalresonant pr controllers and filters, and their suitability for currentvoltage control of gridconnected converters. Mtech title list,ieee eee title list,ieee download papers,ieee latest idea,ieee papers,ieee recent papers,ieee latest. Ucc256403 the device is an exact equivalent in functionality and parametrics to the compared device. Another advantage associated with the pr controllers and filters is the.
Proportional integral plus multifrequency resonant. The current tracking errors are greatly reduced when the quasipr controller rather than the proportional integration controller is applied. Abstract this paper presents a proportional resonant pr controller design in discrete domain for regulating the active and reactive power output for a. Two classic mechanical examples are the toilet bowl float. A robust multiresonant pr regulator for threephase grid. Design of pr current control with selective harmonic compensators. However, all controller parameters must be adaptive, which makes the practical implementation of such mechanisms complicated, especially when a bank of resonant controllers is used to reject a high number of. Proportional integrator pi and proportional resonant pr are the two most widely used current controller 1618. The performance of the pr controller is u2measured based on the ability of the controller to reduce the harmonic distortion in the inverter system with nonlinear.
Asymmetric hbridge singlephase sevenlevel inverter topology with proportional resonant controller. Harmonic suppression and performance improvement for a. Choose a web site to get translated content where available and see local events and offers. Based on the above a robust multi resonant pr regulator for threephase gridconnected vsi using direct pole placement design strategy bin li, ming zhang, long huang. A proportional resonant pr controller is used for replacing the conventional proportional.
Design and control of proportional resonant controller based. Design of proportionalresonant controller with zero steadystate. The analysis and implementation of proportional resonant. High frequency dual synchronous rectifier controller for llc converter. This paper presents the design and analysis of a proportional resonant controller with a resonant harmonic compensator and switchtype fault current limiter, as a faultride through strategy for a threephase, gridconnected photovoltaic pv system under normal conditions and asymmetrical faults. Proportional plus resonant control for active power filter. Converters, pr control theory is revised in detail with a number of practical. The switching states and the corresponding voltage vector values of pwm inverter gridconnected in twophase stationary coordinate are shown in table 1, where s a, s b and s c represents the switching status of phase a, b, c, respectively and s k 1 represents the upper switch in phase k turning on and the under switch turning off, s k 0 denotes the upper switch in phase k turning off. The singlephase gridconnected voltage source inverters with lcl filters are widely implemented in the grid using traditional proportional integral pi.
The working principle is analyzed, parameter design and implementation method for pr control are given. The hardware implementation is used to test the harmonic elimination using an active power filter. Two classic mechanical examples are the toilet bowl float proportioning valve and the flyball governor. Pr proportional resonant controller matlab answers. The recently introduced proportionalresonant pr controllers and filters. Open loop and closed loop bode diagrams plotted by siso tool matlab shown in fig. Aalborg universitet analysis, design and implementation of a. The application research of proportional resonance. In a first mode of operation, the controller turns off a secondaryside power switch earlier than a turnoff time of a primaryside power switch by a time difference that is. Dec 14, 2015 tuning rules for proportional resonant controllerscontrol system projects. Stability of gridconnected inverter with lcl filter. Kp is the proportional gain term, ki is the integral gain term and. Ucc256303 llc resonant controller enabling low standby. Such a controller enhances the frequency tracking behaviour of ac references with a low order transfer function in comparison with the conventional multiharmonic proportionalresonant controllers.
Comparative study of pi and proportional resonant control. This paper presents a procedure to design a proportional resonant pr current controller with additional pr selective harmonic compensators for grid connected photovoltaic pv inverters. The proportional resonant pr controller is one of the most popular controllers used for gridconnected inverters to regulate the current injected into the grid. Aalborg universitet analysis, design and implementation of. When using the pi controller, the sinusoidal axes would be a problem.
The complete work is designed and implemented in matlabsimulink. The recently introduced proportionalresonant pr controllers and filters, and their suitability for currentvoltage control of gridconnected converters, are described. In this chapter, the pr current controller is designed and implemented for threephase inverters, in the stationary reference frame and in the natural reference frame. Antiwindup schemes for proportional integral and proportional resonant controller by anirban ghoshal and vinod john download pdf 327 kb. Suppression of power system forced oscillations based on pss. How can i tune pr proportional resonant controllers in. Design and control of proportionalresonant controller based. Ucc256303 llc resonant controller enabling low standby power. The pressure sensed by the level transmitter, which is representative of the level in the tank, will also fall. Tuning rules for proportional resonant controllersieee. Figure 2 nonideal proportional resonant 5rd harmonic compensator controller bode diagram the 7th harmonic compensator at a resonant frequency 7.
A novel controller based on the application of fractional order calculus into proportionalresonant controllers has been presented. Harmonic suppression and performance improvement for a smallscale gridtied wind turbine using proportionalresonant controllers. A proportional resonant control strategy for efficiency. Proportionalresonant controllers and filters for gridconnected voltagesource converters. Proportional resonant pr controller are gaining popularity for their advantages over pi controller particularly for control of grid connected inverters 6, 7. The application research of proportional resonance control. Based on the above a robust multiresonant pr regulator for threephase gridconnected vsi using direct pole placement design strategy bin li, ming zhang, long huang. The current controller based on vr control has a higher gain at its resonant frequency, which can control the ac current at the resonant frequency with high precision. This controller is different from traditional pi control, pr control can introduce the infinite gain at the. Proportionalintegrator pi and proportionalresonant pr are the two most widely used current controller 1618.
This project is describing the recently introduced proportional resonant pr controller and its performance in the application of 7level multilevel inverter controller system. The frequency output from a phaselocked loop pll can be used as input in pr controllers to have adaptive tuning with respect to the grid frequency, as suggested in and. Fortunately, the triple pole is possible thanks to the extra parameter having freedom to choose. Proportional integral plus multifrequency resonant current controller for gridconnected voltage source converter under imbalanced and distorted supply voltage conditions authors jiabing hu. If the outflow qo increases then the level in the tank will fall. This paper also presents a comparison of thd between proportional integral pi and proportional resonant pr controllers and indicates that the thd using proportional resonant pr controller is less than the proportional integral pi controller by more than 2%. A proportional resonant pr controller is used for replacing the. The proportional resonant control pr control is a simple and efficient control. It is thus beneficial to use the proportional resonant pr controller fig. Tuning rules for proportional resonant controllerscontrol system projects. The switchtype fault limiter comprised of currentlimiting inductors, a bridge rectifier, a. Harmonic suppression and performance improvement for a small. With only one adjustable parameter the ponly controller is easier to tune for best performance compared to other, multiparameter forms of the pid.
It has been designed to pair with a pfc stage to provide a complete power system using a minimum of external components. The recently introduced proportional resonant pr controllers and filters. Proportional plus resonant control for active power filter in. An embodiment of the invention relates to an llc power converter including a controller configured to regulate an output characteristic of the power converter by controlling a power converter switching frequency. Simulation results are provided to verify the effectiveness of the quasipr controller and its design method in a cgci. The design of the pr current control and the harmonic compensators will be carried out using matlab.
Stability analysis of the proportionalresonant controller in single phase converters. Mar 19, 2015 proportionalonly control is the simplest of the pid controller forms as it is limited to a single tuning parameter controller gain k c. Proportionalresonant controllers and filters for gridconnected. The recently introduced proportional resonant pr controllers and filters, and their suitability for currentvoltage control of gridconnected converters, are described. However, conventional pi controller is not able to eliminate steadystate errors in current tracking19. Us20110267844a1 controller for a resonant switchedmode. The proportionalresonant pr controller is one of the most popular controllers used for gridconnected inverters to regulate the current injected into the grid. Unlike such related methods that are usual for pid design, and those that have been recently proposed for pr controllers, the method in this paper is not restricted to plants whose nyquist diagram crosses the negative real axis. Microsemis resonant mode llc halfbridge controllers offer higher efficiency, power density and component density than possibly achievable with switching regulators, and with considerable lower noise. A novel controller based on the application of fractional order calculus into proportional resonant controllers has been presented.