EPE Association: EPE 2018 - DS3d: Application of Control Methods to Electrical Systems

EPE 2018 - DS3d: Application of Control Methods to Electrical Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 03: Measurement and Control > EPE 2018 - DS3d: Application of Control Methods to Electrical Systems

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   A Novel Control Strategy for Reducing Common-Mode Currents in Bidirectional Drive Systems
By Maximilian SCHMITT [View]
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Abstract: In electrical drive systems parasitic capacitances are forming resonant circuits in combination with the inductances of the system. A bidirectional drive system consists of at least one line side and one motor side inverter. Each inverter switching operation is stimulating common-mode oscillation in system resonant circuits. An active damping strategy reducing common-mode currents and voltages by influencing the pulse patterns of the inverters is presented in this paper. The method is based on a direct current control which is implemented in an FPGA. Results of the investigation are proved by experimental results and compared to a classical SV-PWM (without damping features). In addition, a method to analyse resonant circuits is introduced.

   Cascaded Continuous and Finite Model Predictive Speed Control for Electrical Drives
By Sebastian WENDEL [View]
[Download]

Abstract: This paper presents a new cascaded model predictive control (MPC) approach for electrical drives. The new cascaded continuous and finite model predictive control (CCF-MPC) combines two different predictive control algorithms in a cascaded structure. The finite control set approach (FCS-MPC) offers an optimised current control and the continuous control set approach (CCS-MPC) enables an optimal speed control. The cascaded control scheme allows a prediction in dependence of electrical and mechanical time constants. The separation of the time constants offers an optimum between the discrete granularity of the predictive step size and the possible length of the prediction horizon. In this way, a predictive control of the entire mechatronic system is possible. In addition, non-linear and linear equations of the drive system are separated. The results of the proposed method show an optimised current with highly dynamic behaviour in combination with an active damping of oscillations at the mechanical shaft of the drive system, which are beneficial for mechatronic applications.

   Communication-less Optimal Frequency Control in Islanded Microgrids
By Yousef KHAYAT [View]
[Download]

Abstract: This paper proposes a decentralized linear quadratic regulator (LQR) for secondary control layer of islanded microgrids. This approach regulates the system frequency while guaranteeing accurate active power sharing among all the sources. Unlike the existing works, a systematic approach is introduced to design a communication-less secondary controller based on an appropriate quadratic cost function via the optimal LQR technique. Its decentralized characteristics, simplicity in implementation, optimality, and straightforwardness of the design procedure are the major features of the presented approach. Design procedure is depended only to the cut-off frequency of the droop layer low-pass filter and renders an optimal performance. Simulation results validate the efficiency of the proposed approach.

   Frequency-Adaptive MPC of Grid-Forming VSC-HVDC Systems with Optimal Voltage Reference Tracking during Grid Restoration
By Florian MAHR [View]
[Download]

Abstract: Grid restoration strategies gain in significance since fundamental changes inside electrical power grids are in progress. The share in volatile energy sources connected through power electronic components increases, whereas the installed power of grid-connected generators and associated inertia decreases. In this context, critical operating states up to system blackouts, that threaten the security of supply and the access to electical energy, might occur. In order to restore the grid after a blackout in an efficient way, this paper proposes an advanced control concept for high voltage direct current (HVDC) systems using voltage source converters (VSC) in grid- forming mode. VSC-HVDC systems open new restoration paths and offer the possibility to involve healthy grid areas form a far distance to take part in the restoration process. To benefit from the potential of renewable energy sources and energy storage devices to support the process, established restoration strategies are extended by the consistent integration of power electronics and intelligent control schemes. The presented model predictive controller (MPC) enables precise voltage reference tracking inside the restoration area to ensure a grid compatible voltage ramp-up process by avoiding undesireable effects, e.g. inrush phenomena of transformers. Moreover, the grid frequency is used as a system-wide parameter that is used as a physical information channel between the grid-forming VSC-HVDC station and further power converters inside the restoration area. In that way, renewable energy sources and storage devices can contribute to speed up the restoration process while guaranteeing system stability.

   Innovative sensor system case study integration in students training programme for sustainable education of electrical engineers
By Antons PATLINS [View]
[Download]

Abstract: Analyzing world's scientific literature it is possible to find the main problem in the definition ofsustainability - the concept is indistinct. The goal of the research is to offer innovative sensor systemcase study integration in students training program for sustainable education process.

   Modelling and Model-Based Control of A Bearingless 100 kW Electric Motor for High-Speed Applications
By Subhadyuti SAHOO [View]
[Download]

Abstract: This paper presents model-based control (MBC) analyses of a bearingless interior permanent magnet motor (IPMM). The motor is capable of producing 100 kW power for use in high-speed applications in industries. The maximum speed of the motor is 22000 rpm. Motor's initial parameters are obtained through Finite Element Method (FEM) analyses. State-space models, controller and observer matrices are built based on the optimal, operating points obtained from FEM analyses. Thereafter, the rotor's magnetic levitation characteristics are analyzed through digital control strategies. Performances of the controlled system are recorded and subsequently discussed.

   Sensorless Tolerant Fault Control for Dual Permanent Magnet Synchronous Motor Drive with Global FPGA Emulator
By Khaldoune SAHRI [View]
[Download]

Abstract: This paper proposes sensorless tolerant fault control of Dual Permanent Magnet Synchronous Motors (DPMSM), fed by PWM Inverters with separated or coupled loads. The analytical redundancy is realized by FPGA Emulator of global system. This Hardware In Loop (HIL) emulation guarantees system monitoring and its successful operation without any sensor in health end fault conditions.

   Sequence-decoupled resonant control of three-phase grid-interfacing inverter for local voltage support under unbalanced load
By Ya ZHANG [View]
[Download]

Abstract: This paper considers a three-phase four-wire grid-interfacing voltage-source inverter with local unbalancedand distorting loads. A sequence-decoupled resonant control strategy is proposed to support thelocal voltage on top of conventional active power regulation. The local voltage at the point of commonconnection, which is traditionally used for grid synchronization for distributed generators, is also usedfor sensing unbalanced and harmonic voltages. Therefore, measurements of load currents for unbalancedand harmonic compensation can be eliminated with the proposed approach.

EPE 2018 - DS3d: Application of Control Methods to Electrical Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 03: Measurement and Control > EPE 2018 - DS3d: Application of Control Methods to Electrical Systems
	[return to parent folder]

	A Novel Control Strategy for Reducing Common-Mode Currents in Bidirectional Drive Systems By Maximilian SCHMITT	[View] [Download]
Abstract: In electrical drive systems parasitic capacitances are forming resonant circuits in combination with the inductances of the system. A bidirectional drive system consists of at least one line side and one motor side inverter. Each inverter switching operation is stimulating common-mode oscillation in system resonant circuits. An active damping strategy reducing common-mode currents and voltages by influencing the pulse patterns of the inverters is presented in this paper. The method is based on a direct current control which is implemented in an FPGA. Results of the investigation are proved by experimental results and compared to a classical SV-PWM (without damping features). In addition, a method to analyse resonant circuits is introduced.

	Cascaded Continuous and Finite Model Predictive Speed Control for Electrical Drives By Sebastian WENDEL	[View] [Download]
Abstract: This paper presents a new cascaded model predictive control (MPC) approach for electrical drives. The new cascaded continuous and finite model predictive control (CCF-MPC) combines two different predictive control algorithms in a cascaded structure. The finite control set approach (FCS-MPC) offers an optimised current control and the continuous control set approach (CCS-MPC) enables an optimal speed control. The cascaded control scheme allows a prediction in dependence of electrical and mechanical time constants. The separation of the time constants offers an optimum between the discrete granularity of the predictive step size and the possible length of the prediction horizon. In this way, a predictive control of the entire mechatronic system is possible. In addition, non-linear and linear equations of the drive system are separated. The results of the proposed method show an optimised current with highly dynamic behaviour in combination with an active damping of oscillations at the mechanical shaft of the drive system, which are beneficial for mechatronic applications.

	Communication-less Optimal Frequency Control in Islanded Microgrids By Yousef KHAYAT	[View] [Download]
Abstract: This paper proposes a decentralized linear quadratic regulator (LQR) for secondary control layer of islanded microgrids. This approach regulates the system frequency while guaranteeing accurate active power sharing among all the sources. Unlike the existing works, a systematic approach is introduced to design a communication-less secondary controller based on an appropriate quadratic cost function via the optimal LQR technique. Its decentralized characteristics, simplicity in implementation, optimality, and straightforwardness of the design procedure are the major features of the presented approach. Design procedure is depended only to the cut-off frequency of the droop layer low-pass filter and renders an optimal performance. Simulation results validate the efficiency of the proposed approach.

	Frequency-Adaptive MPC of Grid-Forming VSC-HVDC Systems with Optimal Voltage Reference Tracking during Grid Restoration By Florian MAHR	[View] [Download]
Abstract: Grid restoration strategies gain in significance since fundamental changes inside electrical power grids are in progress. The share in volatile energy sources connected through power electronic components increases, whereas the installed power of grid-connected generators and associated inertia decreases. In this context, critical operating states up to system blackouts, that threaten the security of supply and the access to electical energy, might occur. In order to restore the grid after a blackout in an efficient way, this paper proposes an advanced control concept for high voltage direct current (HVDC) systems using voltage source converters (VSC) in grid- forming mode. VSC-HVDC systems open new restoration paths and offer the possibility to involve healthy grid areas form a far distance to take part in the restoration process. To benefit from the potential of renewable energy sources and energy storage devices to support the process, established restoration strategies are extended by the consistent integration of power electronics and intelligent control schemes. The presented model predictive controller (MPC) enables precise voltage reference tracking inside the restoration area to ensure a grid compatible voltage ramp-up process by avoiding undesireable effects, e.g. inrush phenomena of transformers. Moreover, the grid frequency is used as a system-wide parameter that is used as a physical information channel between the grid-forming VSC-HVDC station and further power converters inside the restoration area. In that way, renewable energy sources and storage devices can contribute to speed up the restoration process while guaranteeing system stability.

	Innovative sensor system case study integration in students training programme for sustainable education of electrical engineers By Antons PATLINS	[View] [Download]
Abstract: Analyzing world's scientific literature it is possible to find the main problem in the definition ofsustainability - the concept is indistinct. The goal of the research is to offer innovative sensor systemcase study integration in students training program for sustainable education process.

	Modelling and Model-Based Control of A Bearingless 100 kW Electric Motor for High-Speed Applications By Subhadyuti SAHOO	[View] [Download]
Abstract: This paper presents model-based control (MBC) analyses of a bearingless interior permanent magnet motor (IPMM). The motor is capable of producing 100 kW power for use in high-speed applications in industries. The maximum speed of the motor is 22000 rpm. Motor's initial parameters are obtained through Finite Element Method (FEM) analyses. State-space models, controller and observer matrices are built based on the optimal, operating points obtained from FEM analyses. Thereafter, the rotor's magnetic levitation characteristics are analyzed through digital control strategies. Performances of the controlled system are recorded and subsequently discussed.

	Sensorless Tolerant Fault Control for Dual Permanent Magnet Synchronous Motor Drive with Global FPGA Emulator By Khaldoune SAHRI	[View] [Download]
Abstract: This paper proposes sensorless tolerant fault control of Dual Permanent Magnet Synchronous Motors (DPMSM), fed by PWM Inverters with separated or coupled loads. The analytical redundancy is realized by FPGA Emulator of global system. This Hardware In Loop (HIL) emulation guarantees system monitoring and its successful operation without any sensor in health end fault conditions.

	Sequence-decoupled resonant control of three-phase grid-interfacing inverter for local voltage support under unbalanced load By Ya ZHANG	[View] [Download]
Abstract: This paper considers a three-phase four-wire grid-interfacing voltage-source inverter with local unbalancedand distorting loads. A sequence-decoupled resonant control strategy is proposed to support thelocal voltage on top of conventional active power regulation. The local voltage at the point of commonconnection, which is traditionally used for grid synchronization for distributed generators, is also usedfor sensing unbalanced and harmonic voltages. Therefore, measurements of load currents for unbalancedand harmonic compensation can be eliminated with the proposed approach.