Output feedback control of a single phase voltage source inverter utilizing a variable structure observer

Latham, Joseph; Mohebbi, Mohammad; McIntyre, Michael L.

doi:10.23919/acc.2017.7963581

Cited by 5 publications

(5 citation statements)

References 15 publications

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“…The design of (9)-(11) is motivated by the stability analysis with a single goal of meeting the control objective of e t → 0 as t → 0. Outside this objective, the signals for r f t , p t , e f t have no physical meaning, which is different from an observation approach presented in [47]. To further the control development, a new error signal that will facilitate the inclusion of the system dynamics from (3) is also defined…”

Section: Filter-based Control Developmentmentioning

confidence: 99%

“…This filter is followed with a low pass‐likefilter for

r_{normalf} ()(, t)

defined in (11) to generate an additional filter signal

e_{normalf} ()(, t)

. The design of (9)–(11) ismotivated by the stability analysis with a single goal of meeting the controlobjective of

e ()(, t) false\to 0 as t false\to 0 .

Outside this objective, the signals for

r_{normalf} ()(, t), p ()(, t), e_{normalf} ()(, t)

have no physical meaning, which is differentfrom an observation approach presented in [47]. To further the control development, a new error signal that willfacilitate the inclusion of the system dynamics from (3) is also defined

η ≜ \dot{e} + α e - r_{normalf} .

In this definition, η ( t ) can beinterpreted as the error between the actual signal

\dot{e} ()(, t) + α e false(t false)

and the filtered (observed) signal

r_{normalf} ()(, t) = {\dot{e}}_{normalf} ()(, t) + α e_{normalf} false(t false)

.…”

Section: Filter‐based Control Developmentmentioning

confidence: 99%

See 1 more Smart Citation

Sensorless control of an H‐bridge inverter with output inductor‐capacitor filter

Mohebbi

McIntyre

Latham

2018

IET Power Electronics

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This study presents a filter-based control scheme for an H-bridge inverter with an output inductor-capacitor filter. This approach relies only on a single output voltage measurement to reduce the system cost as well as measurement noise and disturbance injected by output current and/or inductor current measurements. Also, the proposed control algorithm is robust against parameter discrepancy. A Lyapunov stability analysis is performed to demonstrate the control objective is met and that all signals in the closed loop system are stable. Experimental results demonstrate excellent voltage tracking, insensitivity to the load and system parameter variations, and low output voltage distortion as well as the stability of the system under both linear and non-linear loads.

show abstract

Section: Filter-based Control Developmentmentioning

confidence: 99%

“…This filter is followed with a low pass‐likefilter for

r_{normalf} ()(, t)

defined in (11) to generate an additional filter signal

e_{normalf} ()(, t)

. The design of (9)–(11) ismotivated by the stability analysis with a single goal of meeting the controlobjective of

e ()(, t) false\to 0 as t false\to 0 .

Outside this objective, the signals for

r_{normalf} ()(, t), p ()(, t), e_{normalf} ()(, t)

η ≜ \dot{e} + α e - r_{normalf} .

In this definition, η ( t ) can beinterpreted as the error between the actual signal

\dot{e} ()(, t) + α e false(t false)

and the filtered (observed) signal

r_{normalf} ()(, t) = {\dot{e}}_{normalf} ()(, t) + α e_{normalf} false(t false)

.…”

Section: Filter‐based Control Developmentmentioning

confidence: 99%

Sensorless control of an H‐bridge inverter with output inductor‐capacitor filter

Mohebbi

McIntyre

Latham

2018

IET Power Electronics

Self Cite

View full text Add to dashboard Cite

show abstract

“…A Luenberger observer was built in [20] to enable stable control using inductor current estimates for the SA mode. In addition, in order to enhance the stability and transient efficiency of the inverter under nonlinear load circumstances, an effective nonlinear controller based on a state-feedback observer has been presented for output voltage monitoring [21]. Furthermore, to ensure a smooth transition between both modes, a disturbance observer-based feedforward method has been adopted by storing the estimate of the change in the inner current loop's reference [22].…”

Section: Introductionmentioning

confidence: 99%

The Design and Processor-In-The-Loop Implementation of a Super-Twisting Control Algorithm Based on a Luenberger Observer for a Seamless Transition between Grid-Connected and Stand-Alone Modes in Microgrids

et al. 2023

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The abrupt transfer from grid-connected (GC) to stand-alone (SA) operation modes is one of the major issues that may threaten the stability of a distributed generation (DG) system. Furthermore, if the islanding mode happens, it is vital to take into consideration the load voltages or load current waveforms as soon as feasible. This paper develops an advanced control technique based on a super-twisting sliding mode controller (ST-SMC) for a three-phase inverter operating in both the GC and SA modes. This control scheme is proposed to ensure a smooth transition from the GC to SA mode and enhance the load voltage waveforms under the islanding mode. In addition, to minimize the operational costs of the system and the complexity of the studied model, a digital Luenberger observer (DLO) with a proper design is adopted for estimating the inverter-side current. The control scheme of the whole system switches between a current control mode during the GC mode and a voltage control mode during the SA mode. The super-twisting control algorithm is applied to the outer voltage control loop involved in the cascaded voltage/current control scheme in the SA mode. Simulation tests of a three-phase inverter are performed for the purpose of assessing the suggested control performance by using the PowerSim (PSIM) software and comparing it with a classical PI controller. Furthermore, a processor-in-the-loop (PIL) implementation in a DSP board TMS32F28335 while debugging is conducted using code composer studio 6.2.0. The obtained results show efficient control properties, such as a smooth transition among the microgrid (MG) operating modes, as well as effectiveness and robustness during both the GC and SA operation modes.

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“…In order to improve the stability and reduce the sensor counts, some voltage or current sensorless control strategies based on state observer methods are proposed. A robust nonlinear controller based on variable structure observer is proposed for output voltage tracking (Latham et al, 2017), which can improve the steady-state and transient performance of the inverter under nonlinear loads conditions. A full-state feedback current controller with a reduced-order disturbance observer is proposed for single-phase grid-tied inverter systeme (Cheng et al, 2021), it can reduce the influence of uncertain interference factors and improve the robustness of the system.…”

Section: Introductionmentioning

confidence: 99%

An Inductor Current Sensorless Control Strategy Based on Modified VSG Method for Single-Phase Microgrid Application With Seamless Transfer Capability

Zhang

Zheng

et al. 2021

Front. Energy Res.

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This paper proposes an inductor current sensorless control strategy based on modified virtual synchronous generator (VSG) method for single-phase inverter-interfaced microgrid application. Firstly, the outer power loop with Q-U integral term is presented for output reactive power enhancement, and an inner voltage regulation loop based on luenberger state observer is proposed to reduce the inductor current sensor. Meanwhile, in order to improve the response speed of the observer, the luenberger observer is designed based on the optimal pole assignment method. Secondly, a seamless switching strategy based on the modified VSG method is proposed, which can realize the seamless transition between the island mode and grid-connected mode. Finally, a single-phase 3kW VSG prototype is built, and the effectiveness and correctness of the proposed control strategy is verified by the simulation and experimental results.

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Output feedback control of a single phase voltage source inverter utilizing a variable structure observer

Cited by 5 publications

References 15 publications

Sensorless control of an H‐bridge inverter with output inductor‐capacitor filter

Sensorless control of an H‐bridge inverter with output inductor‐capacitor filter

The Design and Processor-In-The-Loop Implementation of a Super-Twisting Control Algorithm Based on a Luenberger Observer for a Seamless Transition between Grid-Connected and Stand-Alone Modes in Microgrids

An Inductor Current Sensorless Control Strategy Based on Modified VSG Method for Single-Phase Microgrid Application With Seamless Transfer Capability

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