EPE Association: EPE 2019 - LS5a : Estimation and Control Methods Applied to Electrical Systems

EPE 2019 - LS5a : Estimation and Control Methods Applied to Electrical Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 03: Measurement and Control > EPE 2019 - LS5a : Estimation and Control Methods Applied to Electrical Systems

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   Continuous Full Order Model of Triple Active Bridge Converter
By Pavel PURGAT [View]
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Abstract: With the rising popularity of the power electronic based systems with integrated energy storage, the multi-port isolated converter topologies are gaining popularity. In contemporary literature, the triple active bridge (TAB) converter is the most popular among these topologies. However, the TAB was not yet described with the continuous-time full-order model. In this paper, the continuous-time full-order model of the TAB converter is derived. The derived model is validated with the measurement of the control-to-output transfer functions. The derived model can provide useful insights into the operation of the converter and can be used for controller design.

   Experimental Evaluation of Cascaded Continuous and Finite Set Model Predictive Speed Control for Electrical Drives
By Sebastian WENDEL [View]
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Abstract: The proposed paper describes and experimentally validates a cascaded continuous and finite set model predictive control (CCF-MPC) algorithm for a mechatronic drive system. This approach is advantageous for the speed control of electrical drives in mechatronic systems with high requirements on the electrical and mechanical controlled system equally. CCF-MPC enables, on the one hand, the optimization of the steady-state current performance, as indicated by a reduced total harmonic distortion, and a highly dynamic current behavior by using the advantages and direct control nature of finite control set MPC. On the other hand, due to the integration of a continuous control set MPC concept, CCF-MPC allows a foresighted and active damping of mechanical oscillations in the load speed. This is beneficial for the overall predictive optimization of mechatronic systems (e.g., two-mass systems), which are present, e.g., for electrical drives in machine tools.

   LOW SPEED PERFORMANCE IMPROVEMENT IN A SELF-COMMISSIONED SENSORLESS PMSM DRIVE BASED ON ROTOR FLUX OBSERVER
By Massimiliano PASSALACQUA [View]
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Abstract: A self-commissioning sensorless algorithm for surface mounted permanent magnet synchronous motors is shown in this paper. The sensorless method is based on rotor flux observer and, differently from methods based on motor anisotropy, it does not require high frequency voltage injection; therefore, it does not cause additional losses and acoustic noise. The aim of this paper is to evaluate sensorless behavior in the low speed region, where performance of methods without high frequency voltage injection generally worsen. In particular, motor starting with rated torque at standstill and with intermittent torque is analyzed. Regarding self-commissioning algorithm, the estimation of motor parameters becomes crucial if this algorithm is used together with sensorless control, since the estimated values not only are used to realize the motion control (e.g., field oriented control) but also to estimate rotor position. Sensorless algorithm sensitiveness to motor parameter uncertainties is investigated. Experimental results are shown, using four different motors of various sizing.

   Optimal Hard Switching as Benchmark for SiC MOSFET Switching Losses with limited du/dt and blocking voltage
By Robert Wolfgang MAIER [View]
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Abstract: In this paper, a universally applicable analytic benchmark is introduced to calculate optimal achievablehard switching losses. In a system, where the semiconductor has to meet given limitations like a maximum voltage slope, the benchmark calculates minimum reachable switching losses when the limits are completely exploited. In principle, two values, the maximum voltage slope du/dt and the commutation loop stray inductance Ls suffice to calculate an optimal hard switching waveform concerning switching losses. The benchmark is developed for high power applications, where the switching speed of the semiconductor is limited by the du/dt and the inductive switching overvoltage. The benchmark can be used for a fast evaluation of the effectiveness of certain optimization methods of the gate control or the effort of system parameter optimizations like reducing the stray inductance. In contrast to simulation tools it is independent of the MOSFET characteristic and gate driver, which allows an independent basic analysis.

EPE 2019 - LS5a : Estimation and Control Methods Applied to Electrical Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 03: Measurement and Control > EPE 2019 - LS5a : Estimation and Control Methods Applied to Electrical Systems
	[return to parent folder]

	Continuous Full Order Model of Triple Active Bridge Converter By Pavel PURGAT	[View] [Download]
Abstract: With the rising popularity of the power electronic based systems with integrated energy storage, the multi-port isolated converter topologies are gaining popularity. In contemporary literature, the triple active bridge (TAB) converter is the most popular among these topologies. However, the TAB was not yet described with the continuous-time full-order model. In this paper, the continuous-time full-order model of the TAB converter is derived. The derived model is validated with the measurement of the control-to-output transfer functions. The derived model can provide useful insights into the operation of the converter and can be used for controller design.

	Experimental Evaluation of Cascaded Continuous and Finite Set Model Predictive Speed Control for Electrical Drives By Sebastian WENDEL	[View] [Download]
Abstract: The proposed paper describes and experimentally validates a cascaded continuous and finite set model predictive control (CCF-MPC) algorithm for a mechatronic drive system. This approach is advantageous for the speed control of electrical drives in mechatronic systems with high requirements on the electrical and mechanical controlled system equally. CCF-MPC enables, on the one hand, the optimization of the steady-state current performance, as indicated by a reduced total harmonic distortion, and a highly dynamic current behavior by using the advantages and direct control nature of finite control set MPC. On the other hand, due to the integration of a continuous control set MPC concept, CCF-MPC allows a foresighted and active damping of mechanical oscillations in the load speed. This is beneficial for the overall predictive optimization of mechatronic systems (e.g., two-mass systems), which are present, e.g., for electrical drives in machine tools.

	LOW SPEED PERFORMANCE IMPROVEMENT IN A SELF-COMMISSIONED SENSORLESS PMSM DRIVE BASED ON ROTOR FLUX OBSERVER By Massimiliano PASSALACQUA	[View] [Download]
Abstract: A self-commissioning sensorless algorithm for surface mounted permanent magnet synchronous motors is shown in this paper. The sensorless method is based on rotor flux observer and, differently from methods based on motor anisotropy, it does not require high frequency voltage injection; therefore, it does not cause additional losses and acoustic noise. The aim of this paper is to evaluate sensorless behavior in the low speed region, where performance of methods without high frequency voltage injection generally worsen. In particular, motor starting with rated torque at standstill and with intermittent torque is analyzed. Regarding self-commissioning algorithm, the estimation of motor parameters becomes crucial if this algorithm is used together with sensorless control, since the estimated values not only are used to realize the motion control (e.g., field oriented control) but also to estimate rotor position. Sensorless algorithm sensitiveness to motor parameter uncertainties is investigated. Experimental results are shown, using four different motors of various sizing.

	Optimal Hard Switching as Benchmark for SiC MOSFET Switching Losses with limited du/dt and blocking voltage By Robert Wolfgang MAIER	[View] [Download]
Abstract: In this paper, a universally applicable analytic benchmark is introduced to calculate optimal achievablehard switching losses. In a system, where the semiconductor has to meet given limitations like a maximum voltage slope, the benchmark calculates minimum reachable switching losses when the limits are completely exploited. In principle, two values, the maximum voltage slope du/dt and the commutation loop stray inductance Ls suffice to calculate an optimal hard switching waveform concerning switching losses. The benchmark is developed for high power applications, where the switching speed of the semiconductor is limited by the du/dt and the inductive switching overvoltage. The benchmark can be used for a fast evaluation of the effectiveness of certain optimization methods of the gate control or the effort of system parameter optimizations like reducing the stray inductance. In contrast to simulation tools it is independent of the MOSFET characteristic and gate driver, which allows an independent basic analysis.