Asymptotic Reference Tracking and Disturbance Rejection of UDE-Based Robust Control

Ren, Beibei; Zhong, Qing-Chang; Dai, Jiguo

doi:10.1109/tie.2016.2633473

Cited by 148 publications

(80 citation statements)

References 30 publications

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“…Note that (Ren et al, 2017) has recently proposed a design of the reference model for AC signal, to overcome the gap between the reference model output to the reference signal. The UDE control law is obtained from (12) as…”

Section: Power Inverter Output Voltage Regulatormentioning

confidence: 99%

“…This theory has been evolved from the time delay control problem, which has been investigated in Ito, 1987, 1990), to overcome the need of calculating derivatives of system states and to cancel the need of a delay in the controller. Successful applications of the UDE approach include several practical examples, such as servo control (Ren et al, 2017), wind turbine control, (Ren and Zhong, 2013), inverter power flow control (Wang et al, 2016) and DC-DC voltage regulation (Kuperman, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Design of a UDE Frequency Selective Filter to Reject Periodical Disturbances

et al. 2017

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Section: Power Inverter Output Voltage Regulatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of a UDE Frequency Selective Filter to Reject Periodical Disturbances

et al. 2017

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“…The d-axis current reference is modified by comparing the switching period and summation of active switching times for inverter pulse width modulation control in the flux-weakening region, thus extending the hexagon of the space vector modulation in [14]. The smooth switching between the constant torque region and the flux-weakening region is realized by using the amplitude of inverter output voltage and d-axis current as input of set-reset flip-flop in [15].Recently, an uncertainty and disturbance estimator (UDE)-based control has attracted much attention and has been applied to unknown time delay systems, nonlinear systems, and power converters [16][17][18][19][20][21][22]. The algorithm assumes that an unknown continuous signal can be estimated by an appropriate filter and compensated to the control system.…”

mentioning

confidence: 99%

“…The UDE-based control is applied to surface permanent magnet synchronous motor and proposes a simple parameter tuning algorithm in [19], but does not analyze the operating condition in flux-weakening regions. The influence of different filters on the system has been discussed in detail [20]. The asymptotic tracking and disturbance suppression are realized under different types of reference values.In this paper, an improved UDE-based flux-weakening control strategy for an IPMSM system is proposed to solve the poor robustness caused by parameter variation in the flux-weakening region, and the torque fluctuation when the operation point switches between the constant torque region and flux-weakening region.…”

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confidence: 99%

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An Improved UDE-Based Flux-Weakening Control Strategy for IPMSM

Zhang

et al. 2019

Energies

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Interior permanent magnet synchronous motors (IPMSMs) are usually used in electric vehicle drives and in other applications. In order to enlarge the speed range of IPMSMs, the flux-weakening control method is adopted. The traditional flux-weakening control strategy degrades the control performance because of parameter mismatches caused by variation of motor parameters. An improved uncertainty and disturbance estimator (UDE)-based flux-weakening control strategy is proposed for IPMSM drives in this paper. The parameter tuning method in the UDE-based control is improved. In addition, a flux-weakening adjusting factor is put forward to reduce the torque fluctuation when the operation point switches between the constant torque region and the flux-weakening region. This factor can be adjusted online by a lookup table. Finally, the validity of proposed method is verified by the simulation and experimental results. The results show that the proposed control strategy can effectively enhance the robustness of the system in the flux-weakening region, and make the system switch more smoothly between the constant torque region and the flux-weakening region.Energies 2019, 12, 4077 2 of 17 method. The influence of magnetic saturation and stator resistance are considered in [7], and an optimal control strategy is proposed. However, the flux observation is limited by the rotor position in this strategy. A linearized and constrained model predictive control is put forward to the flux-weakening control in [8]. However, this method involves a large amount of calculation and is extremely sensitive to parameter variation. In order to suppress the influence of parameter variation on the system, a voltage feedback control strategy is applied in the flux-weakening region. A flux-weakening current output by a proportional integral (PI) controller is added to the d-axis current reference. The input of the PI controller is the difference between the output voltage amplitude and the maximum available voltage amplitude of inverter. This method is simple, independent of motor parameters, and has good robustness, but the dynamic performance needs to be improved. The conventional voltage feedback method is improved in [9]. The difference between DC link voltage and output voltage of current controller is used to calculate the phase angle of reference current space vector by an adaptive algorithm. However, the global stability of the IPMSM system cannot be guaranteed. A single current regulator is proposed to improve the voltage utilization of the DC bus in [10]. This method eliminates the poor effect caused by the coupling of the d and q axis current, but the decrease of efficiency and stability is still not to be ignored. A line modulation-based flux-weakening control was proposed to maximize the DC bus voltage utilization in [11].The difference between the output voltage amplitude and the maximum voltage amplitude of the inverter is regarded as the judgment of whether to enter the flux-weakening region to reduce the switching fluctuation caus...

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Unknown system dynamics estimator based coordinated control of the ultra supercritical boiler‐turbine unit with coal pulverizing delay for large load accommodation

Liu

Yang

2022

Asian Journal of Control

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The ultra-supercritical boiler-turbine unit is required to accommodate large-range load following to maintain the stability of grid frequency. However, the input delay in the coal pulverizing process poses a challenge to the coordinated control of the boiler-turbine unit, which is always neglected in existing works but dramatically affects the stability of steam pressure and temperature. In this paper, to handle the delay caused by coal pulverizing, a predictor-based delay compensation structure is developed for producing a delay-free control framework for the throttle steam pressure. Moreover, to overcome intrinsic nonlinearities in the dynamics of the boiler-turbine unit, the unknown system dynamics estimator is employed in the controllers' design for the steam enthalpy in the separator and active power of the turbine. Thus, precise and fast regulation for the active power output can be achieved under wide load following task. The salient merit of the proposed control is that the overshot of the throttle steam pressure and the specific enthalpy in the separator can be significantly alleviated, which is necessary for turbine blade. A Lyapunov-Krasovskii functional is introduced to deal with the time delay in the stability proof. Finally, the proposed coordinated control is validated in three typical working scenarios.

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Asymptotic Reference Tracking and Disturbance Rejection of UDE-Based Robust Control

Cited by 148 publications

References 30 publications

Design of a UDE Frequency Selective Filter to Reject Periodical Disturbances

Design of a UDE Frequency Selective Filter to Reject Periodical Disturbances

An Improved UDE-Based Flux-Weakening Control Strategy for IPMSM

Unknown system dynamics estimator based coordinated control of the ultra supercritical boiler‐turbine unit with coal pulverizing delay for large load accommodation

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