Reactive power compensation of transmission lines by. Compensators synchronous condensers facts thyristorbased facts static var compensator svc shunt. A phaselag compensator tends to shift the root locus to the right in the complex splane, which is undesirable. Step 6 calculate the real parameters resistors and capacitors for the selected compensator so that the desired poleszeros are achieved. Controller design based on root locus general effects of addition of pole and zero lead lag compensator realization with op amp lead compensator design lead compensator improves stability and transient response. For exemple to improve stability, uncouple a system, to a leadlag compensator, phase compensator. Using rootlocus ideas to design controller we have seen how to draw a root locus for given plant dynamics.
Design via rootlocusintro lead compensator pid controllers design module 08 controller designs. May 04, 2020 chapter 8 compensators and controllers notes, control system, electrical engineering electrical engineering ee notes edurev is made by best teachers of electrical engineering ee. Compensators can be designed in the time domain using root locus approach or in. Ultimate aim is same for both, but the difference is compensator.
Dr ahmed massoud university of strathclyde 2 facts 1. Varma associate professor hydro one chair in power systems engineering university of western ontario london, on, canada. Reiflexa compensator technic reiflexa compensators are made from various elastomers and provide the flexible element in pipework that is indispensabel in todays technically advanced plant and machinery installations. Systems and control theory stadius center for dynamical systems, signal processing and data analytics definition both a lead compensator and a lag compensator have the same shape. Compensation in control system lag lead compensation. Compensating devices are may be in the form of electrical, mechanical, hydraulic etc. More power plants, substations, and transmission lines need to be constructed. Application of the material of chapters 7 and 8 to design closedloop regulators that employ switching converters. On the control system tab, you can select a compensator tuning method, and create response plots for analyzing your controller performance. Laglead compensator is an electrical network which produces phase lag at one frequency region and phase lead at other frequency region. Pdf the static var compensator svc device in the power.
Testing was carried out on a 3 kw gridconnected pv inverter which was. Design and implementation of pid controller with lead. Variable volume piston pumps control options general pv. Integral control adds a pole at the origin for the openloop. A compensating network is one which makes some adjustments in order to make up. It can help maintain the voltage magnitude at the bus it is connected to at a desired value during load. Slva662 4 demystifying type ii and type iii compensators using opamp and ota for dcdc covverters 2 type ii compensator using opamp offering an origin pole, one zero, and one highfrequency pole, the type ii compensator provides a phase boost up to 90 degrees. The laglead compensator circuit in the s domain is shown in the following figure. For this example, graphically tune your compensator using the root locus editor and openloop bode editor, and validate the design using the closedloop step response. Two examples illustrate the utility of these compensators for system modeling and controller design.
Static synchronous series compensator sssc is a modern power quality facts device that employs a voltage source converter connected in series to a transmission line through a transformer. The sssc operates like a controllable series capacitor and series inductor. A static var compensator has no significant moving parts other than internal switchgear. Controller design using root locus semester 083 page 8 for this lab, we will assume a unity feedback controller of the form shown in figure 1, where is the controller transfer function and is the plant transfer function. You can also store, compare, and export different control system designs. Design via root locus elec304alper erdogan 1 1 lecture.
This function is done in the same way as a simple relief valve does. A first order compensator is, generally an electric network or operational amplifier circuit the transfer function of which has a zero and a pole that lie on the negative real axis in the splane. Which is the function of the compensator in a variable. It is a combination of both the lag and the lead compensators. Sometimes, proportional control with a carefully chosen value of k is. Choose the standard values for resistors and capacitors such that they are as close to the calculated values as possible.
Pvm piston pumps pvm018020 pvm074081 service manual. Video created by university of colorado boulder for the course converter control. Design of static synchronous series compensator based. A derivative compensator adds a zero to the forward path. The laglead compensator circuit in thes domain is mentioned in the following figure. Design via root locus elec304alper erdogan 1 25 lead compensation.
Control systemscontrollers and compensators wikibooks. A compensating network is one which makes some adjustments in order to make up for deficiencies in the system. Compensator design lead compensators lag compensators leadlag compensators ee3cl4. This paper proposes designing of static synchronous series compensator sssc based damping controller to enhance the stability of a single machine infinite bus smib system by means of invasive weed optimization iwo technique. The csc compensators are designed for use in radiator systems to control either a three port mixing valve or a boiler. Phase lead compensators help to shift the poles of the transfer function to the left, which is beneficial for stability purposes. Introduction, basics and types of compensator in control. In this video, i have explained compensator with following aspects. Because there is only one pole and one zero, they both should be located on the real axis. In the previous lesson about design and tuning in control system, we studied the different types of controllers. Example waveforms shown for digital and analog controllers only slight differences associated with quantization and saturation digital controller model includes ad converter, discretetime compensator and digital pwm blocks digital controller analog controller. Both the methods have their own attractive features and limitations.
This circuit appears as both the compensators are cascaded. The compensator is basically a control pressure valve that opens the pass from the outlet of the pump toward the servo piston. Compensators gate study material in pdf in these gate preparation notes, we discuss compensators. Svcs are part of the flexible ac transmission system device family, regulating voltage, power factor, harmonics and stabilizing the system. The design of the pr current control and the harmonic compensators will be carried out using matlab. Control tutorials for matlab and simulink motor speed. The primary difference is that its injected voltage is not related to the line intensity and can be managed independently. While the examples involve loworder plants, the principles of. We include a variable gain k in a unityfeedback con. Example design three lead compensators for the system to reduce the settling factor by a factor of 2 while maintaining %30 overshoot for the system solution. The pole and zero of the compensator are usually placed in the low frequency region. The controller is designed to be simple to install and easy to use.
Pr current controller with additional pr selective harmonic compensators for grid connected photovoltaic pv inverters. A static var compensator svc is a set of electrical devices for providing fastacting reactive power on highvoltage electricity transmission networks. Design of lead and lag compensators using frequency domain techniques tim davidson mcmaster university winter 2020. In the previous lesson about design and tuning in control system, we studied the different types of controllers and their usage in time response improvement. As the outside temperature falls, the radiator temperature is increased. What is the difference between a controller and a compensator. So that the transfer function of this circuit can be the product of transfer functions of the lead and the lag compensators. Yongan deng, masc student at concordia university 1. Chapter 8 compensators and controllers notes, control. Demystifying type ii and type iii compensators using op. The simplest network used for compensator are known as lead, lag network.
Compensation of dead time in pid controllers advanced application note. It is known as the mix of both the lag and the lead compensators. Now available is the ic industrial control which can be used as a load sensing compensator, remote compensator control and electrohydraulic control. Compensators can be designed in the time domain using root locus approach or in the frequency domain by using the bode plots. Root locus controller design page a lag compensator was designed with the following transfer function. Control systems compensators in control systems tutorial. And both the pole and zero location should be close to the origin, in the lhp. The csc senses outside temperature and varies the water flow temperature to the radiators. The static var compensator svc is generally used as a voltage controller in power systems. By using well quality proven rubber compositions, combined with many years experience reiflexa compensators guarantee maximum safety and a high quality standard. In principle, it performs the same voltage regulation as the svc but in a more robust manner because unlike the svc, its operation is not impaired by the presence of low voltages. It is operated as a static var compensator whose capacitive or inductive output currents are controlled to control the bus voltage with which it is connected.
Difference between controller and compensator in terms of. Getting started with the control system designer matlab. This document is highly rated by electrical engineering ee. The lag compensator is an electrical network which produces a sinusoidal output having the phase lag when a sinusoidal input is applied. Control design using bode plots performance issues synthesis leadlag examples. One basic need of control system design is to obtain desired output value, these two controller and compensator are there to fulfill this purpose. It has been established that a combination of shunt and series compensators called hybrid scheme works out well. Design of pr current control with selective harmonic. Pdf lead and lag compensators with complex poles and zeros.
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