# Sliding Mode Control Applied To UPS Inverter Using Norm of the State Error

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1 Sliding Mode Control Applied To UPS Inverter Using Norm of the State Error Hamza A. M. Makhamreh Submitted to the Institute of Graduate Studies and Research in partial fulfillment of the requirements for the Degree of Master of Science in Electrical and Electronic Engineering Eastern Mediterranean University February 2013 Gazimağusa, North Cyprus

2 Approval of the Institute of Graduate Studies and Research Prof. Dr. Elvan Yılmaz Director I certify that this thesis satisfies the requirements as a thesis for the degree of Master of Science in Electrical and Electronic Engineering. Prof. Dr. Aykut Hocanın Chair, Department of Electrical Electronic and Engineering We certify that we have read this thesis and that in our opinion it is fully adequate in scope and quality as a thesis for the degree of Master of Science in Electrical and Electronic Engineering. Prof. Dr. Osman Kukrer Supervisor Examining Committee 1. Prof. Dr. Hasan Kömürcügil 2. Prof. Dr. Osman Kukrer 3. Prof. Dr. Runyi Yu

3 ABSTRACT In dynamical system it is impossible to avoid dealing with uncertain conditions such as disturbances; that case is applicable on the UPS Inverter. There are many approaches to control inverters; here we are going to introduce a new approach of sliding mode control applied to UPS inverters. We reduce the sliding time of the state trajectory, by defining a function with respect to the error norm. This function gives the system a value of the sliding line at each instance, such that the performance is improved. The function is defined as the norm of both voltage error and its derivative multiplied by a factor. The norm value is saturated for small and large value of, which represents the slope of the sliding line. Another parameter () is also introduced, which is a gain multiplying the result of the saturated function. When the state is far from the origin, small value of is used in the reaching mode, while large value of is used when the state reaches the sliding line and start to slide on the sliding line. From the definition of the norm error, a function is derived which is used to minimize the reaching time. The results of simulation are compared to Three level hysteresis and rotating sliding mode approaches. The new approach shows a fast response with very small value of the voltage error. Keywords: uninterruptible power supply, inverters, sliding mode control, rotating sliding line. iii

4 ÖZ Dinamik sistemlerde bozan etkenler gibi belirsiz durumlarla karşılaşmak mümkündür. Bu çevirgeçler için de geçerlidir. Çevirgeçleri kontrol etmek için bir çok yaklaşım vardır. Bu çalışmada Kesintisiz Güç Kaynak (KGK) çevirgeçlerin kontrolu için yeni bir kayan kipli kontrol yöntemi önerilmektedir. Hata dizgesine bağlı bir işlev tanımlamak suretiyle durum gezingesinin kayma zamanını kısaltmak mümkündür. Bu işlev kayma çizgisine her an yeni bir eğim vererek başarımı artırmaktadır. Bu işlev çıkış voltajı ve türevinin düzgesi olarak tanınlanmaktadır. Düzge değeri kayma çizgisinin eğiminin çok küçük ve çok büyük değerleri için doyuma ulaşır. Bu doyumlu işlevi çarpan bir parametre () daha tanımlanmıştır. Durum vektörü merkezden uzak olduğunda ve erişme kipi sırasında için küçük, durum vektörü kayma çizgisine ulaştığında ve bunun üzerinde kaymaya başladığında ise büyük bir değer kullanılır. Düzgenin tanımından hareketle kayma zamanını en aza indigemede kullanılabilecek bir işlev elde edilmiştir. Benzetim sonuçları üç-seviyeli histerisis ve dönen kayma kipli yöntemleri ile karşılaştırılmıştır. Önerilen yöntemin daha hızlı tepki ve daha düşük voltaj hatası verdiği gözlenmiştir. Anahtar kelimeler: Kesintisiz Güç Kaynakları, Çevirgeçler, Kayan Kipli Kontrol, Dönen Kayma Çizgisi. iv

5 To: My Beloved Uncle, Abu Nedal. v

6 ACKNOWLEDGMENTS It would not have been possible to write this thesis without the help and support of the kind people around me, to only some of whom it is possible to give particular mention here. Especially, I would like to thank my supervisor Prof. Osman Kukrer for his patience, support and immense knowledge in all aspect of my research. He teaches me how to understand, think, analyze then conclude the results. I would like to thank the chairman of Electrical and Electronic department Prof. Aykut Hocanin for his good advice, support and friendship dealing with us. His support has been invaluable on both an academic and a personal level, for which I am extremely grateful. My parents, brother and sister have given me their obvious support throughout, as always, for which my simple expression of thanks likewise does not suffice. Special Thanks goes to my favorite uncle Abu Nedal and his Great wife Kamela for their care, interest, and support in all phases of my life. I am most grateful to my best friend Derar Zedan and Ahmed Yassin for supporting me each moment I spend in Cyprus. I do not forget that, the first and last thanks is all for our God. vi

7 TABLE OF CONTENTS ABSTRACT... iii ÖZ... iv ACKNOWLEDGMENTS... vi LIST OF TABLES... x LIST OF FIGURES... xi LIST OF ABBREVIATIONS... xiii 1 INTRODUCTION Inverters Single-Phase Half Bridge Inverter Single Phase Full Bridge Inverter Inverter Applications REVIEW OF CONTROL METHODS Iterative Learning Control ILC Applied to UPS Inverter Repetitive Control Continuous Time Delay Discrete Time Delay RC Applied to UPS System Deadbeat Control Pole Placement Control Deadbeat Control Applied to UPS Inverters Adaptive Control Model Reference Adaptive Control (MRAC) vii

8 2.4.2 Self Tuning Controllers (STC) Adaptive Control Applied to UPS Inverter SLIDING MODE CONTROL BACKGROUND Basic notion of VSC Statement of Variable Structure Control VSC Applied to Linear Systems Reaching Condition and Reaching Mode: Reaching Condition Reaching Law Sliding Condition and Sliding Mode Chattering Problem The Continuous Approach Tuning the reaching Law Approach SMC OF SINGLE PHASE UPS INVERTER Problem Formulation Norm of the Error Design Parameter Choice COMPUTER SIMULATIONS Introduction Three-level Hysteresis Model Rotating Sliding Line Model Norm of the Error Model Comparison of Results Absolute of the Voltage Error CONCLUSIONS AND FUTURE WORK viii

9 6.1 Conclusion Future Work REFERENCES APPENDICES Appendix A: Solution of Equation (4.14) Appendix B: Contents of the Norm Block Appendix C: Contents of the Triggering Block Appendix D: Matlab Code for Plotting Figure ix

10 LIST OF TABLES Table 5.1: System s parameters for three level hysteresis approach Table 5.2: System s parameters for rotating sliding line approach Table 5.3: System s parameters for the norm approach Table 5.4: Comparison result of all the approaches for traic load Table 5.5: Comparison result of all the approaches for bridge rectifier load x

11 LIST OF FIGURES Figure 1.1: General configuration of DC/AC converter Figure 1.2: (a) Single Phase Half Bridge Inverter, and (b) output voltage and current waveforms Figure 1.3: (a) Single Phase full Bridge Inverter, and (b) output voltage and current waveforms for square wave operation... 4 Figure 1.4: Online UPS Inverter... 5 Figure 2.1: Generator of periodic signal Figure 2.2: Model Reference Adaptive Controller Figure 2.3: A self tuning adaptive controller Figure 3.1: Model system for the given example of VSC Figure 3.2: Switching regions which defined by switching logic s( x Figure 3.3: The phase portrait of the system when 1, x2) s( x Figure 3.4: The phase portrait of the system when 1, x2) Figure 3.5: Trajectory of the system given by equation (3.1) Figure 3.6: Many approaches for designing the relay control Figure 4.1: Single phase UPS inverter Figure 4.2: The proposed nonlinear function in terms of error norm Figure 4.3: x11, x12 and t on the state plane Figure 4.4: vs. time for fixed value of Figure 5.1: Simulink model for three level hysterias approach xi

12 Figure 5.2: Output waveforms of three-level approach (a) output voltage. (b) phase plane portrait (c) voltage error output (d) derivative of the voltage error Figure 5.3: Output voltage and current waveforms for a rectifier load using three level hysteresis approach Figure 5.4: Simulink model for rotating sliding line approach Figure 5.5: Output waveforms of RSMC (a) output voltage. (b) Phase priorities (c) voltage error output (d) derivative of the voltage error Figure 5.6: Output voltage and current waveforms for a rectifier load using rotating sliding line approach Figure 5.7: Simulink model for Norm of the error approach Figure 5.8: Output waveforms of the error of the norm approach (a) output voltage. (b) Phase priorities (c) voltage error output (d) derivative of the voltage error Figure 5.9: Output voltage and current waveforms for a rectifier load using norm of the error approach Figure 5.10: Snap shot for the sliding line, shows the jump occurred on it Figure 5.11: Zoom shot for the output voltages of all the approaches compared to each other Figure 5.12: State trajectory for all the approaches xii

13 LIST OF ABBREVIATIONS CSI DOF EMI ERL FPGA GTO IGBT ILC IMP LCI MOSFET MRAC PID PWM STC VSC VSI Current Source Inverter Degree Of Freedom Electromagnetic Interface Exponential Reaching Law Field Programmable Gate Array Gate Turn-off Thyristor Insulated-Gate Bipolar Transistor Iterative Learning Control Internal Model Principle Load Commutated Inverter Metal Oxide Semiconductor Field Effect Transistor Model Reference Adaptive Control Proportional- Integral Derivative Controller Pulse Width Modulation Self Tuning Controller Variable Structure Control Voltage Source Inverter xiii

14 Chapter1 INTRODUCTION 1.1 Inverters An inverter is a power electronic device which transfers one or multiple DC voltage or current sources to an adjustable switching pattern (AC waveform). The output will be amplitude-, frequency- and phase shift-controllable through control signals to the switched power devices. Figure 1.1 shows the general construction of a DC/AC power converter (inverter), with a fixed input DC current/voltage and variable AC output waveform. V in V out Fixed DC value (voltage or current) AC DC Control Variable output (amplitude, f and ) Figure 1.1: General configuration of DC/AC converter [1]. It s possible to classify the types of inverters depending on the input type. Generally we have voltage source inverters (VSI), with DC input voltage, and current source inverters (CSI) with DC current source. The DC voltage could be configured by a rectifier followed by a capacitor; such conversion is called indirect 1

15 conversion (AC-DC/DC-AC conversion). It s also possible to have a DC source at the input of the inverter by using a DC battery, photovoltaic modules or fuel cells. It s the same for CSI; the DC current can be configured by a rectifier followed by an inductor for indirect conversion, or using traditional DC sources. As mentioned before, the inverters are classified as CSI and VSI, and we can classify them depending on the amount of output power. It s noticeable that the CSI are used in medium and high power conversion by using Pulse Width Modulation (PWM-CSI), or the Load Commutated Inverter (LCI). VSI s are used for the application of medium and high power systems, by using a two-level approach for single-phase and three-phase inverters in low/medium power applications, and multilevel approach for medium/high power applications. Here we are going to discuss single-phase half bridge and full bridge VSI, in sections 1.2 and 1.3 respectively. The application will follow in section Single-Phase Half Bridge Inverter Figure 1.2.a shows the general configuration of a single-phase half bridge inverter, consisting of one leg of semiconductor switches Q1 and Q2, each of them having a diode in parallel. The diodes D1 and D2 allow for the negative current to flow in the opposite direction. Q1 and D1 together are called a Bidirectional Switch and the same is true for Q2 and D2. Two series capacitors are connected in parallel with the Dc source. These capacitors divide the source into two equivalent values (if C1=C2), and provide a neutral point (0) between them for the load to be connected to. The switches Q1and Q2 could be any power switch like GTO, IGBT or MOSFET. 2

16 + C1 g 1 Q1 D1 V ab i L V dc b (0) v ab Load i a + V dc 2 C2 g 2 Q2 D2 V dc 2 D1 Q1 D2 Q2 - (a) (b) Figure 1.2: (a) Single Phase Half Bridge Inverter, and (b) output voltage and current waveforms [1]. Referring to Figure 1.2(a), notice that transistors Q1 and Q2 are controlled by control signals g1 and g2 respectively. The control signal g1 can have the values * +. When the control signal is 1, which means that the switch is ON, then the supply voltage will be connected to terminal a, and the output voltage. And when the control signal is 0, then the switch will be OFF, and the output voltage. Notice that the output voltage is alternating between{ }; which means that we have two level output voltage, as shown in Figure 1.2.b). Practically a dead time is left between turning on Q2 and turning off Q1 or the opposite, which ensures that the switches will not short circuit the source voltage. 1.3 Single Phase Full Bridge Inverter Figure 1.3(a) shows the general construction for a single-phase full bride inverter, or H- Bridge inverter. The inverter consists of two half bridge inverters but without the capacitors on the input, each leg of the inverter has two bidirectional switches 3

17 (power switch in parallel with freewheeling diode) in series, and the load is connected to the midpoint of each leg (to the points a and b). As mentioned before in the half bridge inverter, the power switch could be any power device (MOSEFET or IGBT). + Q1 D1 Q3 D3 V ab i L Vs a b + - i L V ab Load V dc V dc Q2 D2 Q4 D4 D1 D4 Q1,Q4 D2 D3 Q2,Q3 - (a) (b) Figure 1.3: (a) Single Phase full Bridge Inverter, and (b) output voltage and current waveforms for square wave operation [2]. The control signals will be applied to the gates g1 and g4, while its logic inverse will be applied to g2 and g3. For instance, if we consider square wave operation, when we apply logic 1 on g1 and g2 (i.e. ON), then the positive load voltage will be connected to point a through Q1, and the negative supply voltage will be connected to terminal b through Q4, which means that V dc appears on the output. Following the same logic for Q2 and Q3, we will have -V dc on the output as shown above in Figure 1.3, this figure shows also the current waveform for highly inductive load, neglecting the harmonics, and with phase shift (lagging) for the current. 4

18 1.4 Inverter Applications UPS inverters are used to supply loads with the necessary AC power during power failures, for instance medical/life support systems, computers, and communication systems. The main task of the UPS system is to maintain a fixed voltage supplied to the load with a fixed frequency for vital load, whatever discrepancies arise at the load. For the application of UPS, inverters are connected to a DC power supply and used as a rectifier to charge the batteries, so when the AC source fails to supply the load, the inverter pack-up the source, and transform the DC voltage source to an alternative one (AC) by mean of switching control. When the network power supply returns back, the inverter is disconnected from supplying the load and returns back to charging the batteries, as shown in Figure 1.4. Static transfer switch Normal operation Critical Load Utility AC supply Rectifier Inverter Power failure operation Figure 1.4: Online UPS Inverter [3]. For high performance UPS applications, the device should have pure sinusoidal output which containing low harmonic signals such that the total harmonic distortion is very low, a fast transient response for sudden load and high efficiency. The topic of this thesis is to discuss a control method which improves the above factors such that the inverter s quality is increased. 5

19 This thesis is organized as follow; firstly, we are going to represent a tutorial review for control methods used and their application to UPS inverters in chapter two. In chapter Three, the theory of Sliding mode control will be introduced; while, the new approach will be described in chapter four. Simulation and results will be presented in chapter Five, and finally with conclusion and future work in chapter six. In this thesis we represent a new control function which is applied to a UPS inverter using sliding mode control. The aim of the function is dedicated to reduce the sliding time of the state using the norm of the error, which is produced in a combination from the voltage error x 1 and its derivative x 2. The resultant norm value in applied to saturation dynamic function which gives a high slope value when the state trajectory starts to slide on the sliding line. This will reduce the sliding time. The feedback control is used to improve the system efficiency, the amplitude of the fundamental voltage and increase the transient response. The system is compared to other approaches and shows an acceptable level of performance as shown in simulation results. 6

20 Chapter 2 REVIEW OF CONTROL METHODS In this chapter we are going to discuss some of the digital, adaptive and learning controllers. Starting by the learning controller, we can state that a learning controller uses prior data to establish a new control signal. These methods of control can be taught from the practice to develop control presentation and diminish the tracking error [4]. 2.1 Iterative Learning Control Iterative Learning Control (ILC) is a control method used to enhance the transient performance of system that work repeatedly for a preset time period, or it could be defined as mentioned in [5]. The main idea behind ILC is to iteratively find an input sequence such that the output of the system is as close as possible to a desired output. Although ILC is directly associated with control, it is important to note that the end result is that the system has been inverted [5]. ILC has become an interesting method of control for the reason that simple control configuration and excellent tracking performance. For the systems where ILC controller is used, the system uses the information collected from the earlier implementation of the similar duty repetitively to form the control action for the current operation with the purpose of improving the tracking performance from 7

21 iteration to iteration, like what happens in robot arm manipulators and assembling tasks [6]. This method of control is especially used to obtain a specified transient response of a system which is operated repetitively. Using such a controller it s possible to obtain ideal tracking, still even if the mode is unknown and there is no a priori information about the system structure. Also this controller is capable of dealing with nonlinear systems [7]. The motivation toward discovering ILC control, firstly is to solve the problems that couldn t be solved using traditional controllers, especially when a desired transient response is required for particular cases for the systems which operate repetitively. Secondly, repeating processes in industrial applications such as robots, which repeat the same mission from test to test, has mainly focused on batched processes. Batched processes are suitable for low/high volume goods which can be defined as follow [4]: x t 1, k Ax( t, k) Bu( t, k) w( t, k) (2. 1) y t, k Cx( t, k) v( t, k) (2. 2) n m p where x, wr y, vr and For t 0,1,..., T 1; k 1,2,... u R. which denote the states, disturbances, output, measurement noise and inputs respectively. A, B and C are the system matrices with suitable size, t represents different time steps, and T is the period of each x 0, k x. batch index with primary state 0 If we define the tracking error as: 8

22 ,, e t k y t y t k (2. 3) Then the aim of the controller is to have et k The simplest function for the ILC is: r lim, 0. x u t, k u( t, k 1) k e( t, k 1) (2. 4) Notice that the input of the present batch are specified by the earlier batch in ILC addition to the proportional term (with factor of k ILC called the learning matrix). This type of ILC s is called a P-type ILC controller. Also ILC can be shown as: u t, k Q u t, k 1 r t, k (2. 5) ILC such that Q ut, k 1 called the feed-forward factor for ILC;, ILC the updating law for ILC; r t k is called QILC is called Q filter, which improves the robustness of the controller at high frequency disturbance which makes it hard to eliminate the steady state error. The new linear is r t, k L, 1 ILC e t k (2. 6) where L is called the L-filter. Generally ILC improves tracking performances after a few iterations by a self tuning process without using the system model. There are many types of ILC controllers. Firstly, the classical algorithm uses feed-forward control and can reduce the tracking error to zero. Secondly, we can classify the types of ILC s according to learning action type as P-type, D-type, PD-type and PID type, and so 9

23 on. If the current iteration tracking errors were used to figure the control input, this can be viewed as an on-line ILC, then it will be called a D-type online or P-type online ILC controller etc. [6]. The main advantages of ILC controllers can be summarized as: 1. No need for dynamic representation of the control system. 2. Able to reduce the tracking error to zero as the iteration increased. 3. The ability to achieve fast converge rates by selecting high feedback control gain ILC Applied to UPS Inverter It s obvious now that ILC is used where the error signal is periodic, like what we have in nonlinear loads applied to UPS systems, where the controller is reducing the error iteratively. For open loop inverter operation with feed-forward control which forms the main component of the control signal as in [8]. For the inverters due to the presence of the LC filter, a zero phase shift filter is designed and applied to the inverter in order to improve the dynamics of the inverter and to have faster error converges. Because of the open loop nature of this method, a forfeiting factor is established with the purpose of improving the robustness of the inverter. The method of control is introduced in [9], which introduce a new scheme called Hybrid ILC which is the same as ILC introduced in[8], but PD controller is added in parallel to the ILC and the feed-forward reference signal, before comparing the output of the addition to triangular signal. This modification reduced the THD values, faster converge and good steady state error, but still having the disadvantages of complex implementation. This method is suitable for the 10

24 application of the UPS inverter, where the quality of the steady state output is much important rather that fast response. 2.2 Repetitive Control Repetitive control method was established depending on the Internal Model Principle [45]. The internal model principle (IMP) proposed by Francis and Wonham, states that if any foreign signal can be regard as the output of an independent system and if this signal is joined to a closed-loop system, then it will guarantee ideal tracking or complete rejection of that system. When this principle is joined with the truth that any cyclic signal with a known time can be established by a time-delay positive feedback system with a suitable initial function, we form the basis of repetitive control theory [10]. RC is commonly used in the systems which deal with periodic signals (for ex. when we want to track periodic reference and when it s required to reject periodic disturbances), as in industrial manipulators executing operations like picking or placing objects [11]. This control method is a straightforward learning method which was established for the reason of simple and straightforward implementation; it s well-known by its high accuracy and independency from the system which it s applied on. RC became a major approach which used extensively in nonstop route for tracking or rejecting foreign signals where the period of the foreign signal is known [10]. To illustrate this method of control let s consider a linear system given by [4]: Y Z G Z U Z (2. 7) 11

25 1 where, Z is the backward shift operator; G is the transfer function; Y and U are the z-transforms of outputs and inputs respectively. For any periodic signal with period T, using the system shown in Figure 2.1 and after adjusting the initial parameter of the system, we generate a free time-delay system. Any controller have such a generator is called a repetitive controller. This controller aims to have an output tracking a given trajectory RZ 1 ( ) with known period T, such that the tracking error goes to zero while time became very large. Initial Function + + u Z T -T 0 t Figure 2.1: Generator of periodic signal [4]. There are many approaches for designing Q and L filters. The design problem is to improve the robustness of the controller. There are many types of RC controllers Continuous Time Delay The first inspiration and envoy example was to control proton synchrotron magnet power supply, particularly because of the complexity of obtaining high control precision using further control approaches [10]. The creativity of the repetitive control is that it has effectively applied a time delay internal model of any periodic signal with period T, which means: 1 (2. 8) 1 e M Ic TS 12

26 In theory, by including interested in the feedback loop and keeping it stable, then perfect tracking or complete rejection can be achieved for any periodic signals. Notice that the system which built depend on M Ic controller is infinite dimensional system. Some general design guidelines are presented in [12], [13] and [14], which discuss the frequency domain analysis and synthesis Discrete Time Delay For a discrete time classification, once the sampling period T s is coordinated with the reference disturbance signals. N is defined as number of sample/period is taken, T=NT s, a discrete periodic signal originator can be selected as: 1 (2. 9) 1 Z M ID N Using this controller steady-state error can be eliminated for all the cyclic waveforms, given that M ID is located in a stabilize closed-loop system. Unlike the continuous time delay, the discrete time delay internal model M is finite dimensional. ID Advantages of RC can be concluded as follows: high accuracy, straightforward completion and slight dependence on the system parameter (the controller is independent of the system s parameters) [10] RC Applied to UPS System In [19, 20] a new approach is introduced that depends on the combination of conventional PI controller and repetitive controller which is applied to UPS Inverter. The basic idea of this approach is that, when the transient error is small the repetitive controller is handling this error and reducing it, and when the error 13

27 increases to large values due to disturbances, a PI controller is used efficiently to reduce the error by choosing a large value of the proportional term. Note that the integral term should also be chosen carefully. In [19] a simple implementation of this approach is presented, which reveals on zero steady state error at the output. While in [20] a modified approach using saber is introduced with a comparison with the traditional repetitive controller. In [21] a control method which introduces both pole assignment and repetitive control together working to have an acceptable steady state error in the application of UPS inverters. Choosing the observer poles to be 2-3 times further from the system poles, a small steady state error can be achieved. By plugging in a repetitive controller which deals periodically with the errors, steady state error can be reduced furthermore. By combining SVPWM with repetitive controller a high quality output with reduced cost can be achieved. This approach is suitable for the application where the product response is not that important as much the quality of the output signal. A zero phase shift notch filter is used to eliminate the resonant peak of the inverter. The notch filter provides a wide range to parameters variation, and much better harmonic rejection with fast error converges is achieved using this approach, which is a cost effective approach applied to UPS inverters. 2.3 Deadbeat Control Deadbeat control is a discrete control method which aims to find appropriate input signal to be applied to a system such that we have zero error at the output at the steady state in a minimum number of time steps with zero initial condition. 14

28 Noticing that for an Nth order system these steps could be at maximum N, which means that the system in not controllable, so the problem could be solved by applying a feedback loop with specified parameter values in order to ensure that the new poles of the transfer function are at the origin of the z-plane. If we assume that we have a stable plant without dead-time, with a unit step input, noticing that while the difficulty but it s still possible to design a controller for unstable plants without unit step input [23]. Usually, design process is executed in three steps. Firstly, the controller will maintain the fastest response when the output signal is established in one sampling step. The control signal caused by this step is very high, and in most cases the oscillation will occur near the sampling points. This oscillation is caused by cancelation of the zeros of the transfer function outside the unit circle in the z-domain. Secondly, the design is modified to avoid the oscillations that occur in the first step. Zeros of the transfer function is divided into cancellable which will appear in the controller function, and the second ones are the non-cancellable zeros [23]. Further modification could be applied to the system if the control signal is still high, but this will increase the settling time again if you are going to use the polynomial algorithm as a refining solution for the system. Notice that, the design is executed in the s-domain, which is a very interesting feature here because it eliminates the undesirable oscillation and there will be no too high control signal like what we have in time domain frame[23]. For understanding the problem let s consider a linear system given as, 15

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