EPE Association: EPE 2015 - DS2e: Measurement and Control

EPE 2015 - DS2e: Measurement and Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 03: Measurement and Control > EPE 2015 - DS2e: Measurement and Control

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   A new method for fault detection and identification of shadows based on electrical signature of defects
By Michael BRESSAN [View]
[Download]

Abstract: Good diagnosis and monitoring of PV systems are key points to maximize PV production. The main objective ofthis work is focus on the development of a new tool able to detect faults of PV systems on real-time, with aparticular care for the detection of shadows. The proposed detection method is based only on DC powermeasurements.

   A Novel Phase Locked Loop Scheme for Grid Voltage Synchronisation Using the Energy Operator
By CHIGOZIE JOHN NWOBU [View]
[Download]

Abstract: A well-known issue with existing power systems is rapid and accurate synchronisation to grid voltages when the system is unbalanced under grid fault conditions and corrupted with harmonics. This paper presents a novel phase locked loop technique for grid synchronisation technique using the energy operator. A comparative study is undertaken to investigate the accuracy and robustness of this technique compared to existing grid synchronisation techniques.

   Adjustable Field Weakening Control of High-Speed Permanent Magnet Motor for Industrial Application
By Koichiro NAGATA [View]
[Download]

Abstract: This paper presents an adjustable field weakening control method for a high-speed permanentmagnet motor (PMM). A compact designed PMM sometimes needs strong field weakening inthe high-speed domain. The proposed control method adjusts field weakening to obtain enoughtorque for stability of 1MW/3.2kV/ 6600rpm-PMM operation.

   Application of Subsynchronous Damping Controller to Static Var Compensator
By Hamidreza GHORBANI [View]
[Download]

Abstract: This paper proposes a new auxiliary Subsynchronous Damping Controller (SSDC) for the Static VarCompensator (SVC) to damp out subsynchronous oscillations in power system containing series compensated transmission lines. The arrival of Wide Area Measurement (WAM) technology has madeit possible to measure the states of a large power system interconnected with synchronized PhasorMeasurement Units (PMU). This paper presents the idea of using remote signals obtained from PMUto damp SSR. An auxiliary subsynchronous damping controller (SSDC) has been proposed for a SVC,using the generator rotor speed deviation signal as the stabilizing signal to damp subsynchronousoscillations. Sturdiness of the controller has been examined by applying the disturbances in the systemthat causes significant changes in generator's operating point. The IEEE Second Benchmark (SBM)model is used for the analysis and the SVC is simulated using the Power System Block set (PSB) inthe MATLAB/Simulink environment.

   Applying Variable Inputs to Thermal Model of a Distribution Transformer
By Alireza SIADATAN [View]
[Download]

Abstract: The aim of this paper is to present a simulation model to predict the thermal behavior of transformers with variable inputs for transformer load and ambient temperature. The model equations are established to calculate the top oil and hot spot temperatures. A simulation tool is designed to predict a transformer top oil and hot spot temperature based on the transformer manufacturer data and loading. The winding hot-spot temperature can be calculated as a function of the top-oil temperature that can be estimated using the transformer loading data, ambient temperature, wind velocity and solar heat radiation effect. The top oil model equation and hot spot model equation is simulated in MATLAB Simulink under variable environmental condition.

   Cascade Hinf Linear Parameter Varying Control of PMSM
By Lukas POHL [View]
[Download]

Abstract: A robust cascade control structure using the Hinf linear parameter varying current controller and theHinf speed controller is designed for the permanent magnet synchronous motor. The Hinf LPV currentcontroller provides fast current tracking using measured rotor speed as a scheduling variable. High loadtorque disturbance attenuation is achieved using the fixed Hinf speed controller.

   Control and design of a hybrid energy storage system
By Jeremy DULOUT [View]
[Download]

Abstract: The increasing deployment of intermittent renewable energy sources (RESs) around the world has revealed concerns about the power grid stability. To solve this problem, a massive use of storage systems is needed. The main goal of this work is to develop a hybrid energy storage system (HESS) combining several storage devices with complementary performances. In this paper, lead-acid batteries and supercapacitors (SCs) are associated in order to deliver a pulsed current. An innovative cascade control with anti-windup tracking manages the power sharing between a buck and a boost converters connected to the same DC bus. Analog control circuits and power converters have been designed to evaluate the performances of the HESS in real conditions.

   Control Interference of Electrical Machines with Double-Star Winding Systems Driven by Independent Current Controllers
By Gael MESSAGER [View]
[Download]

Abstract: This paper focuses on conditions leading to instability of digitally controlled double three-phase permanent magnet synchronous motors with standard PI controller based voltage source inverters. A first simplified motor model is derived to apprehend the problem. The model is then detailed further to get accurate stability limits. A validation of the analysis is done experimentally on a double star winding permanent magnet synchronous motor. To achieve stability and to fasten the system's dynamic, a new control scheme is proposed, using classical PI controllers with two interconnected inverters.

   Control topologies for modular system
By Josef KADLEC [View]
[Download]

Abstract: This paper deals with control topologies for modular systems of DC-DC converters. It is possible to connect all converters in parallel, all converters in serial or various combinations. The paper describes possible control topologies for mentioned connections and also describes control topology for reconfigurable control system.

   Diagnostics of low-voltage power cables by using broadband impedance spectroscopy
By Antti PINOMAA [View]
[Download]

Abstract: Underground low-voltage cabling will be in important role in the future smart grids to guarantee safeand uninterrupted power distribution. Hence, the diagnosis of cable condition and prognosis of theremaining life time are essential functions. In this paper, a broadband impedance-spectroscopy-basedcable diagnosis method is researched and evaluated with laboratory tests. It is found that the proposedmethod is applicable for fault detection and fault locating in low-voltage power cables, and can beused as the base for the development of low-cost cable online condition monitoring systemimplemented on modern power line communication modems.

   Enhanced Performance of SVC via Using Rotor Speed Deviation Signal (RSDS)
By Hamidreza GHORBANI [View]
[Download]

Abstract: Transient stability enhancement through using a Static Var Compensator (SVC) and Rotor Speed Deviation Signal (RSDS) of synchronous machine are thoroughly investigated in this paper. Speed deviation signal of generator as a remote signal is sent to SVC in order to achieve more transient stability. Studies are carried out on Kundur's four machine two-area test system which SVC is implemented on midway of transmission system. The simulation results verify the effectiveness of the proposed method to improve rotor angle stability versus different kinds of disturbances scenarios. The standard benchmark model is used for the analysis in the MATLAB/Simulink environment.

   High-Speed Sensorless Control of a Synchronous Reluctance Motor Based on an Extended Kalman Filter
By Duc-Quan NGUYEN [View]
[Download]

Abstract: A sensorless control of a high-speed synchronous reluctance motor is proposed in this paper. The control of high-speed motors requires very short sampling periods. Therefore a classical Extended Kalman Filter (EKF) would require an excessive calculation power. To minimize this computational power, an original EKF based on a particular motor model is proposed and validated experimentally. Moreover, this EKF gives better performance than the classical one.

   Impact of a non-conventional PWM strategy on the DC link film capacitor sizing
By NAJIB ROUHANA [View]
[Download]

Abstract: In this paper, an analysis of the DC-link voltage ripple for classic and non-conventional Pulse Width Modulation (PWM) strategies such as the Unified-Double Carrier PWM (Uni-DC PWM) is derived. A focus will be held on the case where Film capacitors are applied. The latter have a very low Equivalent Series Resistance (ESR) which is responsible of losses in real capacitors (especially Electrolytic ones) hence, in the frequency range where the PWM harmonics do exist, a Film capacitor can be considered as having a pure capacitive impedance where the DC-link voltage ripple becomes highly dependent on the harmonic frequency distribution. Thus, it is important to determine the exact harmonic components needed for an analysis to be effective and this is where the double Fourier integral provides a mathematically rigorous application for studying PWM characteristics in the frequency domain. Despite the fact that the main objective of the Uni-DC PWM is to reduce the capacitor's RMS current, results show a reverse impact on the DC-link voltage ripple when a Film capacitor is used.

   Measurement Challenges in Acoustic Emission Research of Semiconductors
By Tommi KÄRKKÄINEN [View]
[Download]

Abstract: Recently, there have been experiments where the acoustic emission sensors have been used in the investigation of power semiconductor components. In this paper the authors present their observations of measurement related challenges they have encountered while doing such experiments. Special focus is on sensor related difficulties. The main result of this study is that while acoustic emission sensors have limitations and special requirements, performing meaningful acoustic emission measurements in power semicondcutor modules is possible.

   Observer-Based Online Parameter Estimation of Squirrel Cage Induction Machine based on a Gradient Descent Method
By Jaroslav KOUPENY [View]
[Download]

Abstract: This paper deals with the online parameter estimation of squirrel-cage induction machines using the Gradient Descent Method and coupled stator and rotor flux observers. Stator resistance, rotor resistance and mutual inductance can be estimated in real time.The presented approach is applicable on a standard industrial drive, including a current measurement and a motor speed feedback. The adaptation algorithm is described with simple analytical terms. The performance has been demonstrated by experiments. Furthermore, the influence of an asymmetrical stator winding, saturation and incorrectly assumed leakage inductances are discussed.

   Performance Comparison of Phase Shifted PWM and Sorting Method for Modular Multilevel Converters
By Marcos REJAS [View]
[Download]

Abstract: Modular Multilevel Converters (MMC) are the solution of preference in HVDC applications due to modularity, scalability, low losses and low filtering requirement. Carrier-based (PWM) and carrier-less (nearest level control) modulation can be applied. By using advanced sorting methods focusing on keeping the capacitor voltage ripple under some limit, unnecessary switching events are eliminated leading to reduced switching losses. This paper presents a comparison between the steady-state performances in terms of output voltage THD and equivalent switching frequency of the Phase Shifted Carrier PWM and NLC plus sorting methods.

   Stability analysis of current and voltage resonant controllers for Voltage Source Converters
By DANIEL HEREDERO-PERIS [View]
[Download]

Abstract: This paper presents an analytical development for the Nyquist trajectory of the closed loop system of aVoltage Source Inverter with resonant control strategy. Both inner current loop and outer voltage loopare taken into account, and the interaction between them is studied. The stability boundaries dependingon different parameters are determined. Firstly, the system is modelled and analysed in continuoustime. Secondly, the analysis is conducted in the discrete time domain. A numeric study supported withgraphical representations is provided for complex analytic situations.

   Variable Speed Drive-Based Fan Impeller Contamination Build-Up Detection: Industrial Case Study
By Jussi TAMMINEN [View]
[Download]

Abstract: Contamination build-up can be considered as a root cause for the imbalance of the fan impeller. This contamination build-up can be detected without sensors by using a variable speed drive. In this paper, the use of the contamination detection method in the case of a rotational speed controlled industrial fan is examined.

   Vector control applied to a Langevin transducer
By Sofiane GHENNA [View]
[Download]

Abstract: In this paper, the control of the vibration amplitude of a Langevin transducer is obtained simultaneously with the tracking of its resonant frequency. Vector control method is applied to achieve this.The result of this study is illustrated with experimental and simulation results.

EPE 2015 - DS2e: Measurement and Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 03: Measurement and Control > EPE 2015 - DS2e: Measurement and Control
	[return to parent folder]

	A new method for fault detection and identification of shadows based on electrical signature of defects By Michael BRESSAN	[View] [Download]
Abstract: Good diagnosis and monitoring of PV systems are key points to maximize PV production. The main objective ofthis work is focus on the development of a new tool able to detect faults of PV systems on real-time, with aparticular care for the detection of shadows. The proposed detection method is based only on DC powermeasurements.

	A Novel Phase Locked Loop Scheme for Grid Voltage Synchronisation Using the Energy Operator By CHIGOZIE JOHN NWOBU	[View] [Download]
Abstract: A well-known issue with existing power systems is rapid and accurate synchronisation to grid voltages when the system is unbalanced under grid fault conditions and corrupted with harmonics. This paper presents a novel phase locked loop technique for grid synchronisation technique using the energy operator. A comparative study is undertaken to investigate the accuracy and robustness of this technique compared to existing grid synchronisation techniques.

	Adjustable Field Weakening Control of High-Speed Permanent Magnet Motor for Industrial Application By Koichiro NAGATA	[View] [Download]
Abstract: This paper presents an adjustable field weakening control method for a high-speed permanentmagnet motor (PMM). A compact designed PMM sometimes needs strong field weakening inthe high-speed domain. The proposed control method adjusts field weakening to obtain enoughtorque for stability of 1MW/3.2kV/ 6600rpm-PMM operation.

	Application of Subsynchronous Damping Controller to Static Var Compensator By Hamidreza GHORBANI	[View] [Download]
Abstract: This paper proposes a new auxiliary Subsynchronous Damping Controller (SSDC) for the Static VarCompensator (SVC) to damp out subsynchronous oscillations in power system containing series compensated transmission lines. The arrival of Wide Area Measurement (WAM) technology has madeit possible to measure the states of a large power system interconnected with synchronized PhasorMeasurement Units (PMU). This paper presents the idea of using remote signals obtained from PMUto damp SSR. An auxiliary subsynchronous damping controller (SSDC) has been proposed for a SVC,using the generator rotor speed deviation signal as the stabilizing signal to damp subsynchronousoscillations. Sturdiness of the controller has been examined by applying the disturbances in the systemthat causes significant changes in generator's operating point. The IEEE Second Benchmark (SBM)model is used for the analysis and the SVC is simulated using the Power System Block set (PSB) inthe MATLAB/Simulink environment.

	Applying Variable Inputs to Thermal Model of a Distribution Transformer By Alireza SIADATAN	[View] [Download]
Abstract: The aim of this paper is to present a simulation model to predict the thermal behavior of transformers with variable inputs for transformer load and ambient temperature. The model equations are established to calculate the top oil and hot spot temperatures. A simulation tool is designed to predict a transformer top oil and hot spot temperature based on the transformer manufacturer data and loading. The winding hot-spot temperature can be calculated as a function of the top-oil temperature that can be estimated using the transformer loading data, ambient temperature, wind velocity and solar heat radiation effect. The top oil model equation and hot spot model equation is simulated in MATLAB Simulink under variable environmental condition.

	Cascade Hinf Linear Parameter Varying Control of PMSM By Lukas POHL	[View] [Download]
Abstract: A robust cascade control structure using the Hinf linear parameter varying current controller and theHinf speed controller is designed for the permanent magnet synchronous motor. The Hinf LPV currentcontroller provides fast current tracking using measured rotor speed as a scheduling variable. High loadtorque disturbance attenuation is achieved using the fixed Hinf speed controller.

	Control and design of a hybrid energy storage system By Jeremy DULOUT	[View] [Download]
Abstract: The increasing deployment of intermittent renewable energy sources (RESs) around the world has revealed concerns about the power grid stability. To solve this problem, a massive use of storage systems is needed. The main goal of this work is to develop a hybrid energy storage system (HESS) combining several storage devices with complementary performances. In this paper, lead-acid batteries and supercapacitors (SCs) are associated in order to deliver a pulsed current. An innovative cascade control with anti-windup tracking manages the power sharing between a buck and a boost converters connected to the same DC bus. Analog control circuits and power converters have been designed to evaluate the performances of the HESS in real conditions.

	Control Interference of Electrical Machines with Double-Star Winding Systems Driven by Independent Current Controllers By Gael MESSAGER	[View] [Download]
Abstract: This paper focuses on conditions leading to instability of digitally controlled double three-phase permanent magnet synchronous motors with standard PI controller based voltage source inverters. A first simplified motor model is derived to apprehend the problem. The model is then detailed further to get accurate stability limits. A validation of the analysis is done experimentally on a double star winding permanent magnet synchronous motor. To achieve stability and to fasten the system's dynamic, a new control scheme is proposed, using classical PI controllers with two interconnected inverters.

	Control topologies for modular system By Josef KADLEC	[View] [Download]
Abstract: This paper deals with control topologies for modular systems of DC-DC converters. It is possible to connect all converters in parallel, all converters in serial or various combinations. The paper describes possible control topologies for mentioned connections and also describes control topology for reconfigurable control system.

	Diagnostics of low-voltage power cables by using broadband impedance spectroscopy By Antti PINOMAA	[View] [Download]
Abstract: Underground low-voltage cabling will be in important role in the future smart grids to guarantee safeand uninterrupted power distribution. Hence, the diagnosis of cable condition and prognosis of theremaining life time are essential functions. In this paper, a broadband impedance-spectroscopy-basedcable diagnosis method is researched and evaluated with laboratory tests. It is found that the proposedmethod is applicable for fault detection and fault locating in low-voltage power cables, and can beused as the base for the development of low-cost cable online condition monitoring systemimplemented on modern power line communication modems.

	Enhanced Performance of SVC via Using Rotor Speed Deviation Signal (RSDS) By Hamidreza GHORBANI	[View] [Download]
Abstract: Transient stability enhancement through using a Static Var Compensator (SVC) and Rotor Speed Deviation Signal (RSDS) of synchronous machine are thoroughly investigated in this paper. Speed deviation signal of generator as a remote signal is sent to SVC in order to achieve more transient stability. Studies are carried out on Kundur's four machine two-area test system which SVC is implemented on midway of transmission system. The simulation results verify the effectiveness of the proposed method to improve rotor angle stability versus different kinds of disturbances scenarios. The standard benchmark model is used for the analysis in the MATLAB/Simulink environment.

	High-Speed Sensorless Control of a Synchronous Reluctance Motor Based on an Extended Kalman Filter By Duc-Quan NGUYEN	[View] [Download]
Abstract: A sensorless control of a high-speed synchronous reluctance motor is proposed in this paper. The control of high-speed motors requires very short sampling periods. Therefore a classical Extended Kalman Filter (EKF) would require an excessive calculation power. To minimize this computational power, an original EKF based on a particular motor model is proposed and validated experimentally. Moreover, this EKF gives better performance than the classical one.

	Impact of a non-conventional PWM strategy on the DC link film capacitor sizing By NAJIB ROUHANA	[View] [Download]
Abstract: In this paper, an analysis of the DC-link voltage ripple for classic and non-conventional Pulse Width Modulation (PWM) strategies such as the Unified-Double Carrier PWM (Uni-DC PWM) is derived. A focus will be held on the case where Film capacitors are applied. The latter have a very low Equivalent Series Resistance (ESR) which is responsible of losses in real capacitors (especially Electrolytic ones) hence, in the frequency range where the PWM harmonics do exist, a Film capacitor can be considered as having a pure capacitive impedance where the DC-link voltage ripple becomes highly dependent on the harmonic frequency distribution. Thus, it is important to determine the exact harmonic components needed for an analysis to be effective and this is where the double Fourier integral provides a mathematically rigorous application for studying PWM characteristics in the frequency domain. Despite the fact that the main objective of the Uni-DC PWM is to reduce the capacitor's RMS current, results show a reverse impact on the DC-link voltage ripple when a Film capacitor is used.

	Measurement Challenges in Acoustic Emission Research of Semiconductors By Tommi KÄRKKÄINEN	[View] [Download]
Abstract: Recently, there have been experiments where the acoustic emission sensors have been used in the investigation of power semiconductor components. In this paper the authors present their observations of measurement related challenges they have encountered while doing such experiments. Special focus is on sensor related difficulties. The main result of this study is that while acoustic emission sensors have limitations and special requirements, performing meaningful acoustic emission measurements in power semicondcutor modules is possible.

	Observer-Based Online Parameter Estimation of Squirrel Cage Induction Machine based on a Gradient Descent Method By Jaroslav KOUPENY	[View] [Download]
Abstract: This paper deals with the online parameter estimation of squirrel-cage induction machines using the Gradient Descent Method and coupled stator and rotor flux observers. Stator resistance, rotor resistance and mutual inductance can be estimated in real time.The presented approach is applicable on a standard industrial drive, including a current measurement and a motor speed feedback. The adaptation algorithm is described with simple analytical terms. The performance has been demonstrated by experiments. Furthermore, the influence of an asymmetrical stator winding, saturation and incorrectly assumed leakage inductances are discussed.

	Performance Comparison of Phase Shifted PWM and Sorting Method for Modular Multilevel Converters By Marcos REJAS	[View] [Download]
Abstract: Modular Multilevel Converters (MMC) are the solution of preference in HVDC applications due to modularity, scalability, low losses and low filtering requirement. Carrier-based (PWM) and carrier-less (nearest level control) modulation can be applied. By using advanced sorting methods focusing on keeping the capacitor voltage ripple under some limit, unnecessary switching events are eliminated leading to reduced switching losses. This paper presents a comparison between the steady-state performances in terms of output voltage THD and equivalent switching frequency of the Phase Shifted Carrier PWM and NLC plus sorting methods.

	Stability analysis of current and voltage resonant controllers for Voltage Source Converters By DANIEL HEREDERO-PERIS	[View] [Download]
Abstract: This paper presents an analytical development for the Nyquist trajectory of the closed loop system of aVoltage Source Inverter with resonant control strategy. Both inner current loop and outer voltage loopare taken into account, and the interaction between them is studied. The stability boundaries dependingon different parameters are determined. Firstly, the system is modelled and analysed in continuoustime. Secondly, the analysis is conducted in the discrete time domain. A numeric study supported withgraphical representations is provided for complex analytic situations.

	Variable Speed Drive-Based Fan Impeller Contamination Build-Up Detection: Industrial Case Study By Jussi TAMMINEN	[View] [Download]
Abstract: Contamination build-up can be considered as a root cause for the imbalance of the fan impeller. This contamination build-up can be detected without sensors by using a variable speed drive. In this paper, the use of the contamination detection method in the case of a rotational speed controlled industrial fan is examined.

	Vector control applied to a Langevin transducer By Sofiane GHENNA	[View] [Download]
Abstract: In this paper, the control of the vibration amplitude of a Langevin transducer is obtained simultaneously with the tracking of its resonant frequency. Vector control method is applied to achieve this.The result of this study is illustrated with experimental and simulation results.