EPE Association: EPE 1989 - 29 - Dialogue Session 1.2: SIMULATION AND SIGNAL PROCESSING

EPE 1989 - 29 - Dialogue Session 1.2: SIMULATION AND SIGNAL PROCESSING
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1989 - Conference > EPE 1989 - 29 - Dialogue Session 1.2: SIMULATION AND SIGNAL PROCESSING

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   SIMULATION OF A CURRENT SOURCE PWM INVERTER
By K. Kaltenbach [View]
[Download]

Abstract: This paper describes the off-line digital simulation of a current source PWM inverter. The simulated circuit configuration includes the mains, a pulse-controlled rectifier and inverter, and an induction motor. The basic operation of the inverter is explained. Pulsewidth control techniques are used to produce sinusoidal inputs and outputs. The applicatlon of the program system NETOMAC to the self-commutated converter results in quick and reliable simulations.

   APPLICATION OF THE TRANSMISSION-LINE MODELLING TECHNIQUE TO THE SIMULATION OF POWER ELECTRONIC CIRCUITS
By S. Y. R. Hui; C. Christopoulos [View]
[Download]

Abstract: This paper presents a new method for the modelling of power electronic circuits. Power components are modelled in a discrete manner based on the Transmission-line modelling (TLM) method. The advantages of the proposed method over conventional numerical techniques, such a the Runge-Kutta and Gear Methods are that (i) it provides an exact solution to the discrete model representing the actual network, (ii) circuit modification due to switching can be easily incorporated into the basic circuit configuration, and (iii) it gives stable solution even for stiff networks. Errors arise only from how accurate the discrete model represents the actual network and not from the numerical algorithm. The TLM model is suitable for time-stepping routine and the TLM algorithm is simple and easily implemented in desktop computers.

   NUMERICAL SIMULATION OF THE STATOR CURRENTS, FLUX AND TORQUE CONTROLS OF AN AC MOTOR
By S. Colombi; J. Mignan [View]
[Download]

Abstract: This paper describes the numerical simulation of the stator currents, flux and torque controls of an AC motor. The control priciple used is based on the orientation on the rotor flux. The originality of this simulation consists in the method used to simulate the stator currents control. In particular, in order ro reduce the computing time, we make use of the sliding mode control theory which is quite adapted for the study of controls that use coommunication command devices. In this paper, we will describe in detail the sliding mode simulation of the stator currents control and we will deal briefly with the simulation of the flux and torque controls.

   MODELLING AND SIMULATION OF A BURIED PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVE
By F. Parasiliti; M. Tursini [View]
[Download]

Abstract: The paper presents the model and simulation of a typical ac drive with permanent magnet synchronous motor and impressed sinusoidal stator currents. In the first section of the paper the single parts of the drive are described: the control system with torque and speed controllers; the power supply structure with transistor chopper inverter modulated by hysteresis current controllers; the buried permanent magnet motor. Two current phase control methods have been considered: id = 0 control and optimal load angle control. Then the numerical simulation of the system is presented. The simulations have been carried out by using the classical d q model and a new model considering the saturation phenomena caused separately by the components id and iq of the armature current. The results obtained are compared and discussed.

   SCRIPT SIMULATOR: FROM CONVERTER TO SEMICONDUCTOR
By F. Oms; J.-P. R. Arches; R. Maimouni; A. Monnier [View]
[Download]

Abstract: This work takes place within the frame of converters global operation study, study made thanks to SCRIPT software which is particularly well adapted to simulate electrical networks using switching semiconductor devices. Since interpretation of some physical phenomena requires a detailed analysis of local components comportments, the authors have to use circuit models that represent these elements more and more accurately. The models are adapted from similar studies established for the SPICE simulator which is based upon numerical semiconductor device modelling, thanks to direct solution of fundamental equations governing device behaviour. This paper aims to describe some semiconductor models, their hierarchy (Macro-Component notion) and their uses. This study offers the opportunity (and originality) of creating a close connection between two widely separated scientific fields: on the one hand, the physics of semiconductor device, on the other hand, the study of this same component from an electrical point of view.

   DIGITAL SIMULATION OF STATIC CONVERTERS TAKING ACCOUNT OF CONTROL LOOPS
By H. Piquet; Y. Cheron; J. Duparc [View]
[Download]

Abstract: The SCRIPT simulation program is presented. SCRIPT allows to simulate all kind of static converter configuration. The closed loop operation can also be taken into account. The control strategy may be implemented in a discrete-time version as well as in a continous-time one.

   ACCURATE MODEL OF RECTIFIER FED BY SYNCHRONOUS MACHINE WITH ASYMMETRICAL ROTOR
By M. W. Winterling; W. Deleroi [View]
[Download]

Abstract: The waveforms of a rectifier connected with mains are determined by the first harmonic, however, within a synchronous machines harmonics are generated due to asymmetrical load of the stator during rectifier operation. To investigate the influence of an asymmetrical rotor on system behaviour a damperless syncbronous machine with cylindrical rotor is considered. An accurate model is presented by calculating the analytical solutions of commutation and conducting period overlap angle is determined by iteration. Analytical solution allows to analyse the influence of system parameters on current harmonics. The model including machine harmonics leads to calculated waveforms which agree with measurements. Considerable overlap angles strongly influenced by load parameters and firing angles limit operation ranges of the rectifier. Rectified voltage is load dependent. Analysis of current waveform shows that harmonics dominate commutation.

   SIMULATION INDUCTION MOTOR FED BY VOLTAGE SOURCE INVERTER WITH ANALYTICAL CALCULATION METHOD
By J. B. Woudstra; W. Deleroi; E. Bos [View]
[Download]

Abstract: In this paper a simulation of the combination voltage source inverter and induction motor is presented. This combination is used in many drive systems. The simulation is based on providing the analytical solution of the system model differential equations. With the analytical calculation method it is possible to simulate the steady state behaviour in one step (without iterations) for different load situations, it is also possible to simulate the dynamical behaviour. In this paper only the steady state behaviour of the system is presented. The simulated results are in a very good agreement with the experimental results. Next part of this research is to discuss the effect of the interruptions (number/width) in the output voltage of the voltage source inverter on the current (harmonics), torque (pulsations) and main flux behaviour. Purpose of this research is to optimize the combination voltage source inverter, induction motor and mechanical load to get the best possible drive system.

   TECHNIQUE IN MODELLING INVERTER-FED MACHINE DRIVES AND INVERTER LOSSES
By D. T. W. Liang; B. W. Williams [View]
[Download]

Abstract: A simple technique for simulating inverter-fed motor drives has been utilized as an alternative to the traditional two-axis machine approach. This technique uses a coupled-circuit approach, and yet retains all the observable stator terminal conditions without time-consuming matrix Inversion. The technique is demonstrated using a three-phase induction motor driven by a phase-controlled thyristor controller as well as a PWM voltage-fed inverter controller. The main advantages are the ease of modification to the system components and the flexibility of implementation to other drives without changing the topology. Time domain analysis is used to determine the steady-state current and torque for any desired voltage, speed and frequency. By using a pseudo-varying time stepping method, the on-state and switching losses can be incorporated based on a first order model for the switching devices.

   SIMULATION OF CONVERTER IN NORMAL AND FAULT OPERATION
By Romuald Szczesny [View]
[Download]

Abstract: Conditions for rational construction of valve model for converter analysis are formulated. A new concept of establishing of a valve model is proposed. The model is represented by a set of states. Thus a simulation of both normal and fault operation is possible only by increment of number of valve states. Each of the states is associated with an equivalent circuit. To built up those circuits only the device manufacturer specification data are necessary. If one of numerical implicit integrated method is applied both invariant topology of converter and stability of numerical solution is assured. The principle of method is presented on two examples. Fïrst, turn off thyristor process in a simple RL circuit is simulated. Second, analysis of inverter driven by DC chopper is presented. The simulation waveforms obtained on a personal computer for normal and fault operation are shown. Given its efficiency the method for converter CAD programs can be recommended.

   A GLOBAL MODEL FOR THE CSI FED INDUCTION MOTOR TAKING INTO ACCOUNT THE COMMUTATION PROCESS
By P. Anciaux; H. Buyse; F. Labrique [View]
[Download]

Abstract: Converter fed AC machines are today widely used for variable speed drive applications. The current source inverter fed induction motor is well suited for applications at medium power ratings such as electric traction. In a previous paper a global model has been introduced for the CSI fed induction motor. This model based on the DC link current and the main fluxes of the machine as state variables has been developped by assuming instantaneous commutations of the current from one phase to the next. The aim of the present paper is to introduce the commutation process in this model and to study its influence on the behaviour of the system. Experiments performed on laboratory test system confirm the theoretical results.

EPE 1989 - 29 - Dialogue Session 1.2: SIMULATION AND SIGNAL PROCESSING
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1989 - Conference > EPE 1989 - 29 - Dialogue Session 1.2: SIMULATION AND SIGNAL PROCESSING
	[return to parent folder]

	SIMULATION OF A CURRENT SOURCE PWM INVERTER By K. Kaltenbach	[View] [Download]
Abstract: This paper describes the off-line digital simulation of a current source PWM inverter. The simulated circuit configuration includes the mains, a pulse-controlled rectifier and inverter, and an induction motor. The basic operation of the inverter is explained. Pulsewidth control techniques are used to produce sinusoidal inputs and outputs. The applicatlon of the program system NETOMAC to the self-commutated converter results in quick and reliable simulations.

	APPLICATION OF THE TRANSMISSION-LINE MODELLING TECHNIQUE TO THE SIMULATION OF POWER ELECTRONIC CIRCUITS By S. Y. R. Hui; C. Christopoulos	[View] [Download]
Abstract: This paper presents a new method for the modelling of power electronic circuits. Power components are modelled in a discrete manner based on the Transmission-line modelling (TLM) method. The advantages of the proposed method over conventional numerical techniques, such a the Runge-Kutta and Gear Methods are that (i) it provides an exact solution to the discrete model representing the actual network, (ii) circuit modification due to switching can be easily incorporated into the basic circuit configuration, and (iii) it gives stable solution even for stiff networks. Errors arise only from how accurate the discrete model represents the actual network and not from the numerical algorithm. The TLM model is suitable for time-stepping routine and the TLM algorithm is simple and easily implemented in desktop computers.

	NUMERICAL SIMULATION OF THE STATOR CURRENTS, FLUX AND TORQUE CONTROLS OF AN AC MOTOR By S. Colombi; J. Mignan	[View] [Download]
Abstract: This paper describes the numerical simulation of the stator currents, flux and torque controls of an AC motor. The control priciple used is based on the orientation on the rotor flux. The originality of this simulation consists in the method used to simulate the stator currents control. In particular, in order ro reduce the computing time, we make use of the sliding mode control theory which is quite adapted for the study of controls that use coommunication command devices. In this paper, we will describe in detail the sliding mode simulation of the stator currents control and we will deal briefly with the simulation of the flux and torque controls.

	MODELLING AND SIMULATION OF A BURIED PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVE By F. Parasiliti; M. Tursini	[View] [Download]
Abstract: The paper presents the model and simulation of a typical ac drive with permanent magnet synchronous motor and impressed sinusoidal stator currents. In the first section of the paper the single parts of the drive are described: the control system with torque and speed controllers; the power supply structure with transistor chopper inverter modulated by hysteresis current controllers; the buried permanent magnet motor. Two current phase control methods have been considered: id = 0 control and optimal load angle control. Then the numerical simulation of the system is presented. The simulations have been carried out by using the classical d q model and a new model considering the saturation phenomena caused separately by the components id and iq of the armature current. The results obtained are compared and discussed.

	SCRIPT SIMULATOR: FROM CONVERTER TO SEMICONDUCTOR By F. Oms; J.-P. R. Arches; R. Maimouni; A. Monnier	[View] [Download]
Abstract: This work takes place within the frame of converters global operation study, study made thanks to SCRIPT software which is particularly well adapted to simulate electrical networks using switching semiconductor devices. Since interpretation of some physical phenomena requires a detailed analysis of local components comportments, the authors have to use circuit models that represent these elements more and more accurately. The models are adapted from similar studies established for the SPICE simulator which is based upon numerical semiconductor device modelling, thanks to direct solution of fundamental equations governing device behaviour. This paper aims to describe some semiconductor models, their hierarchy (Macro-Component notion) and their uses. This study offers the opportunity (and originality) of creating a close connection between two widely separated scientific fields: on the one hand, the physics of semiconductor device, on the other hand, the study of this same component from an electrical point of view.

	DIGITAL SIMULATION OF STATIC CONVERTERS TAKING ACCOUNT OF CONTROL LOOPS By H. Piquet; Y. Cheron; J. Duparc	[View] [Download]
Abstract: The SCRIPT simulation program is presented. SCRIPT allows to simulate all kind of static converter configuration. The closed loop operation can also be taken into account. The control strategy may be implemented in a discrete-time version as well as in a continous-time one.

	ACCURATE MODEL OF RECTIFIER FED BY SYNCHRONOUS MACHINE WITH ASYMMETRICAL ROTOR By M. W. Winterling; W. Deleroi	[View] [Download]
Abstract: The waveforms of a rectifier connected with mains are determined by the first harmonic, however, within a synchronous machines harmonics are generated due to asymmetrical load of the stator during rectifier operation. To investigate the influence of an asymmetrical rotor on system behaviour a damperless syncbronous machine with cylindrical rotor is considered. An accurate model is presented by calculating the analytical solutions of commutation and conducting period overlap angle is determined by iteration. Analytical solution allows to analyse the influence of system parameters on current harmonics. The model including machine harmonics leads to calculated waveforms which agree with measurements. Considerable overlap angles strongly influenced by load parameters and firing angles limit operation ranges of the rectifier. Rectified voltage is load dependent. Analysis of current waveform shows that harmonics dominate commutation.

	SIMULATION INDUCTION MOTOR FED BY VOLTAGE SOURCE INVERTER WITH ANALYTICAL CALCULATION METHOD By J. B. Woudstra; W. Deleroi; E. Bos	[View] [Download]
Abstract: In this paper a simulation of the combination voltage source inverter and induction motor is presented. This combination is used in many drive systems. The simulation is based on providing the analytical solution of the system model differential equations. With the analytical calculation method it is possible to simulate the steady state behaviour in one step (without iterations) for different load situations, it is also possible to simulate the dynamical behaviour. In this paper only the steady state behaviour of the system is presented. The simulated results are in a very good agreement with the experimental results. Next part of this research is to discuss the effect of the interruptions (number/width) in the output voltage of the voltage source inverter on the current (harmonics), torque (pulsations) and main flux behaviour. Purpose of this research is to optimize the combination voltage source inverter, induction motor and mechanical load to get the best possible drive system.

	TECHNIQUE IN MODELLING INVERTER-FED MACHINE DRIVES AND INVERTER LOSSES By D. T. W. Liang; B. W. Williams	[View] [Download]
Abstract: A simple technique for simulating inverter-fed motor drives has been utilized as an alternative to the traditional two-axis machine approach. This technique uses a coupled-circuit approach, and yet retains all the observable stator terminal conditions without time-consuming matrix Inversion. The technique is demonstrated using a three-phase induction motor driven by a phase-controlled thyristor controller as well as a PWM voltage-fed inverter controller. The main advantages are the ease of modification to the system components and the flexibility of implementation to other drives without changing the topology. Time domain analysis is used to determine the steady-state current and torque for any desired voltage, speed and frequency. By using a pseudo-varying time stepping method, the on-state and switching losses can be incorporated based on a first order model for the switching devices.

	SIMULATION OF CONVERTER IN NORMAL AND FAULT OPERATION By Romuald Szczesny	[View] [Download]
Abstract: Conditions for rational construction of valve model for converter analysis are formulated. A new concept of establishing of a valve model is proposed. The model is represented by a set of states. Thus a simulation of both normal and fault operation is possible only by increment of number of valve states. Each of the states is associated with an equivalent circuit. To built up those circuits only the device manufacturer specification data are necessary. If one of numerical implicit integrated method is applied both invariant topology of converter and stability of numerical solution is assured. The principle of method is presented on two examples. Fïrst, turn off thyristor process in a simple RL circuit is simulated. Second, analysis of inverter driven by DC chopper is presented. The simulation waveforms obtained on a personal computer for normal and fault operation are shown. Given its efficiency the method for converter CAD programs can be recommended.

	A GLOBAL MODEL FOR THE CSI FED INDUCTION MOTOR TAKING INTO ACCOUNT THE COMMUTATION PROCESS By P. Anciaux; H. Buyse; F. Labrique	[View] [Download]
Abstract: Converter fed AC machines are today widely used for variable speed drive applications. The current source inverter fed induction motor is well suited for applications at medium power ratings such as electric traction. In a previous paper a global model has been introduced for the CSI fed induction motor. This model based on the DC link current and the main fluxes of the machine as state variables has been developped by assuming instantaneous commutations of the current from one phase to the next. The aim of the present paper is to introduce the commutation process in this model and to study its influence on the behaviour of the system. Experiments performed on laboratory test system confirm the theoretical results.