Modelling and controlling of unified power flow controller. This paper presents a new technique to design a unified power flow controller upfc for power flow control and dc voltage regulation of an electric power transmission system which is based on a hybrid technique which combines a radial basis function rbf neural network online training with the sliding mode technique to take advantage of their common features. Flexible ac transmission systemfacts electronics hub. The unified power flow controller upfc is a compensator formed by the combination of shunt and series voltage source converters vsc, as shown in fig 1. The upfc unified power flow controller is one of the modern power electronics devices that can be used for the control of real and reactive power in a transmission line. The unified power flow controller upfc is a more complete transmission line compensator 42, shown as a simplified block diagram in fig. Tuning of pi and pid controller with statcom, sssc and upfc. The first strategy is the traditional pi controller pic with upfc, and the second strategy is the proposed fuzzy logic controller flc proposed for upfc device along with pi controller. This paper presents an adaptive multiobjective algorithm based unified power flow. Pdf on jan 1, 2017, sobuj kumar ray and others published tuning of pi and pid controller with statcom, sssc and upfc for minimizing.
Multi objective control of upfc using pid type controllers. A unified power flow upfc unified power flow controller controller is one of the devices in the facts flexible ac transmission systems technology that provides greater flexibility in terms of interaction with the operating variables and control of a sep and may be optimal to additional control requirements solution modern sep. The stability of the multimachine power system mmps was analysed with the presence of upfc. Controller for power quality improvement using pi and antiwindup pi awpi controllers. Performance evaluation of pi and awpi controllers based upfc for. Dpfc can be considered as a upfc with an eliminated common dc link.
The input of pi controller is voltage and current of bus bar 5 and bus bar 6 for generation of logic. Sep 19, 2016 the insertion and proper tuning of fractionalorder pi controller in the control scheme, the subsynchronous oscillations are reduced to 92 % in case of statcom and 98 % in case of upfc as compared to without controller and 14 % as compared with the results of conventional pi controller. Neural adaptive control by state space system upfc ssnn for compensation of active and reactive power bouanane abdelkrim, chaker abdelkader, addadi zoubida, amara mohamed abstractin our present paper, we present the effectiveness of the controllers electrical power flow universal unified power flow controller upfc with the choice of a. The unified power flow controller upfc is the most versatile member of the flexible ac transmission systems facts family using power electronics to control power flow on power grids 1. Unified power flow controller upfc, coordinated control, proportional integral pi, power system. The unified power flow controller upfc is the most versatile and complex power electronic. Pdf in this paper, a fuzzy tuned adaptive pi controller ftapic was proposed for the series inverter of a unified power flow controller upfc.
The unified power flow controller upfc was proposed for realtime control and dynamic. In pid controller the free parameters have vital role in its performance. Unified power flow controller upfc, as a representative of the third generation of facts devices, is by far the most comprehensive facts device, in power system steadystate it can implement power flow regulation, reasonably controlling line active power and reactive power, improving the transmission capacity of power system, and in power. The insertion and proper tuning of fractionalorder pi controller in the control scheme, the subsynchronous oscillations are reduced to 92 % in case of statcom and 98 % in case of upfc as compared to without controller and 14 % as compared with. It is an ac transmission system that incorporates a power electronic controller and other static controllers to improve the controllability as well as power transfer capability. The pid controller is the workhorse of the control industry. Maintain the power balance between the shunt and series converters depend on the dc link between them.
Design and simulation of a different innovation controller. And then, this model was applied into a threephase system to observe its influences to power quality. Pi controller process the input of active power and reactive power of bus bar at which upfc controller are connected. A unified power flow controller is an electrical device for providing fastacting reactive power compensation on highvoltage electricity transmission networks. Evaluating the performance of unified power flow controller. Type fault investigation in low frequency oscillation. Thermostat you, walking down the street without falling over a robot trying to keep a joint at a particular angle a blimp trying to maintain a particular. The unified power flow controller upfc is the most versatile and complex power electronic equipment that has emerged as the indispensable equipment for the control and optimization of power flow in electrical power transmission system. This paper presents a novelbacterial foraging technique bfo for optimizing the pi controller parameters of upfc for the transient stability enhancement of smib system. Basics of control based on slides by benjamin kuipers how can an information system like a micro controller, a flyball governor, or your brain control the physical world.
Dq model of pi controller based a unified power flow controller. Application of pid controller for upfc controller wjaet. Upfc based on improved doubleloop decoupling by comparing. Assistant professor, department of eee, easa college of engineering and technology, coimbatore. A new hybrid upfc controller for power flow control and. Fuzzy pi controller, upfc, low frequency oscillation, dynamic stability. This paper presents the application of unified power flow controller upfc in order to simultaneous control of power flow and voltage and also damping of low frequency oscillations lfo at a singlemachine infinitebus smib power system installed with upfc.
Unified power flow controller upfc, coordinated control, proportional integral pi. The results proved the supremacy of the power system stabilizer pss equipped with fblc over the pss equipped with proportional integralpi controller. Comparison of transient stability response for mmps using. The controller can ful ll functions of reactive shunt compensation, series compensation and. Power system transient improvement using pi controller. The insertion and proper tuning of fractionalorder pi controller in the control scheme, the subsynchronous oscillations are reduced to 92 % in case of statcom and 98 % in case of upfc as compared to without controller and 14 % as compared with the results of conventional pi controller. A lyapunov theory based upfc controller for power flow control ali zangeneh, ahad kazemi, majid hajatipour and shahram jadid center of excellence for power systems automation and operation iran university of science and technology, tehran, iran abstract unified power flow controller upfc is the most comprehensive multivariable device among. The unified power flow controller is the most versatile and complex power electronic equipment that has emerged as the indispensable equipment for the cont. Modelling and controlling of unified power flow controller upfc. It can control the active real and reactive imaginary power through a transmission line. The pid controller a weighted combination of proportional, integral, and derivative terms. Keyword facts, upfc, pi d, newelm, nimc, neural adaptive control, synthesis, stability, robustness.
This paper investigates the proposed controller for many types of faults in power system. In this approach pi controller control the firing pulses of power electronics switch of upfc controller. In the third controller, multiobjectives genetic algorithm moga is reformulated to design fractional order pid controller named mfopid. Pituned upfc damping controllers design for multimachine power. Thakre1, rambabu motamarri1 and chaitanya somu2 background series capacitor compensation has been broadly employed in power system to cancel. Pdf design of pi controller for upfc by using bacteria. The first strategy is the traditional pi controller pi c with upfc, and the second strategy is the proposed fuzzy logic controller flc proposed for upfc device along with pi controller. This chapter aims at establishing the design and implementation of the conventional pi controllers at various operating points of the buck and boost converter. Synthesis and control of upfc system using pid and newelm. The multiobjective algorithms such as nsgaii and mnsgaii are used for tuning the parameters of pi controller. Modeling, controller design and semiconductor level. Neural adaptive control by state space system upfc ssnn for. This controller gives appropriate shunt reactive current injected into the power system at which upfc located for appropriate change in bus voltage with.
Optimal selection of different control input signals to upfc. Tuning of pi and pid controller with statcom, sssc and upfc for minimizing damping of doi. The main function of the upfc is to control the flow of real and reactive power. Robust control methods are implemented to tune the pi controllerbased upfc for stability enhancement of a twoarea fourmachine and for siso power system using evolutionary algorithms 20. Pscademtdc software is utilized to design and simulate the model. Tuning of pi and pid controller with statcom, sssc and upfc for minimizing damping of oscillation. The proportional integral pi controller is a vital component of the upfc control structure. Tuning of pi and pid controller with statcom, sssc and. The structure of upfc stabilizing controllers is shown in figure 3, where the controlled signal u can be m e, m b. The results proved the supremacy of the power system stabilizer pss equipped with fblc over the pss equipped with proportional integral pi controller. The unique capabilities of the upfc in multiple line compensation are integrated into a generalized power. Also the proposed ann based upfc also improves the power factor near to unity and reduce the reactive power drawn from the diesel generator compared to fuzzy based upfc.
The energy storing capacity of the dc capacitor is generally small, and so the shunt converter has to draw drain or generate active power from the grid in. This research article proposes a powerful fractionalorder pi controller to mitigate the subsynchronous oscillations in turbinegenerator shaft due to subsynchronous resonance ssr with flexible ac transmission system devices such as static synchronous compensator statcom and unified power flow controller upfc. Upfc control based on new ip type controller request pdf. The studies are performed based on well known software package matlabsimulink tool box. Optimization of upfc controller parameters using bacterial. Simulation by matlabsimulink has been wont to verify proposed system. Tuning of pi and pid controller with statcom, sssc and upfc for. Mitigation of voltage sag and swell in transmission line. In this paper, the modeling, control design and detailed digital simulation of an upfc, in the matlabsimulink environment is presented. Fractionalorder pi based statcom and upfc controller to. The real and reactive power co ordination control technique for the upfc using ann control model can be. Abstract the unified power flow controller upfc is nowadays the most versatile facts controller, offering a unique combination of shunt and series compensations to enable flexible control of power systems. The unified power flow controller upfc is the most versatile and complex power electronic equipment that has emerged for the control and optimization of power flow in electrical power transmission system. Upfc control system using pi controller figure 8 shows pi controller for controlling the firing pulse of thyristor based shunt controller statcom and series controller sssc.
The technique is to use the proportional integral pi controllers in the upfc controllers shunt and series controllers to dynamically adjust the phase angle between the facts devices voltage source converters. The picontroller is used as a basic controller to check the performance of upfc. Unified power flow controller unified power flow controller upfc is a. Design of pi controller for upfc by using bacteria foraging optimization algorithm to enhance power system transient stability conference paper pdf available.
This device can be understood as a statcom and an sssc with a common dc link. Pituned upfc damping controllers design for multimachine. A new scheme to control upfc using bacteria foraging algorithm bfa is proposed to improve the efficiency of upfc pi controller in damping power system oscillations. The proposed controllers have been applied to a unified power flow controller upfc to control. Power flow control in power system using upfc ijert. It uses a pair of threephase controllable bridges to produce current that is injected into a transmission line using a series transformer. Nov, 2015 facts is an acronym for flexible ac transmission system and it is an application of power electronic devices to electrical transmission system.
Tuning of pi and pid controller with statcom, sssc and upfc for minimizing damping of oscillation sobuj kumar. Pdf a fuzzy tuned adaptive pi controller based upfc to. Nonlinear control of upfc for the stabilization of. In this study a upfc based fuzzy pi controller is proposed and designed to damp generator oscillations. Performance investigation of dq model for pi and fuzzy. The basic operations are explained, as well as the control strategies and circuit configurations of the controller. Design of fractional order pid controller for smib power.
Design of pi controller for upfc by using bacteria foraging optimization algorithm to enhance power system transient stability. The controller can control active and reactive power flows in a transmission line. The designed controllers are tested in single machine environment. Power flow control in power system using upfc written by sonal m. When the upfc is in power control mode, the changes in statcom reference reactive power and in sssc injected voltage as are not used. Upfc improves the transient stability of the system and so its.
The active power exchange between the shunt and series converters, which is through the common dc link in the upfc, is now through the transmission lines at the thirdharmonic frequency. Optimal selection of different control input signals to. This paper presents the application of unified power flow controller upfc in order to simultaneously power flow control, voltage support and. Advantage of pi control no offset the pi controller stops computing changes in co when et equals zero for a sustained period at that point, the proportional term equals zero, and the integral term may have a residual value this residual value, when added to cobias, essentially creates an. Majumdar published on 20180424 download full article with reference data and citations.
The unified power flow controller upfc is a power electronic controller which can be used to control active and reactive power flows in a transmission line by injection of variable voltage in series and reactive current in shunt. Complete modeling is done for smib system with upfc controller. Therefore in this study bees algorithm is used to find the optimum. Pdf tuning of pi and pid controller with statcom, sssc. In this study a upfcbased fuzzypi controller is proposed and designed to. Hence ann controller is performing better than pi and fuzzy controller. Power system transient improvement using pi controller based upfc. In this paper, upfc is modeled as an ideal series voltage source with an ideal shunt current source that is incorporated into the model of power system. The upfc uses vsc voltage sourced converter technology to inject a. Unified power flow controller phasor type mathworks.
900 588 893 53 317 718 784 870 571 977 336 540 1201 1022 1009 533 422 1031 704 353 685 170 443 1426 321 400 1083 812 350 806 1259 1030 1229 1387 940 107 77