Effects of Discretization Methods on the Performance of Resonant Controllers

The ability to individually extract different types of disturbances present in AC line currents or voltages is desirable for reference signal calculation algorithms employed in power conditioners, in order to optimize the operation and design of power converters. This paper proposes a novel algorithm based on the dot product of three-dimensional space vectors in the abc coordinate system, for real-time calculation of the instantaneous positive-, negative-and zero-sequence components for individual harmonics. Certain applications are presented, including individually compensating the fundamental reactive power, selected current harmonics and current unbalances. This method is computationally simple and requires no coordinate transformation. The proposed algorithm is validated by simulation and experiments.

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“…• All the control loops are performed in abc coordinates, as it is commonly found in literature (11) (13)- (15) and (16) .…”

Section: Resultsmentioning

confidence: 99%

“…Using Tustin with pre-warping (15) method in (14) results in the following discrete transfer function.…”

Section: Selective Current Harmonics Compensationmentioning

confidence: 99%

Disturbance Calculation based on Space Vector Dot Product: Applications to Compensators

et al. 2015

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“…In order to realize digital control, the proposed PR controller is discretized using the pre-Tustin transformation method which can realize the mapping between s-domain and the z-domain [26,27]:…”

Section: Implementation Of Pr Controllermentioning

confidence: 99%

A Proportional Resonant Control Strategy for Efficiency Improvement in Extended Range Electric Vehicles

Wang

Sun

et al. 2017

Energies

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Abstract:The key to control the range extender generation system is to improve the efficiency and reduce the emissions of the electric vehicle (EV). In this paper, based on the purpose of efficiency optimization, both engine and generator are matched to get a public high efficiency region, and a partial power following control strategy was presented. The engine speed is constant in the defined power range, so the output power regulation of the range extender is only realized by the adjustment of the torque of the generator. Engine speed and generator torque were decoupled. An improved proportional resonant (PR) controller is adopted to achieve fast output power regulation. In order to ensure the response characteristics of the control system and to improve the robustness, the impacts on system's characteristics and stability caused by PR controller and parameters in the inner-current loop were analyzed via frequency response characteristics. A pre-Tustin with deviation compensation is proposed for PR controller's discretization. A stable and robust power following control method is obtained for the range extender control system. Finally, simulation and experiment of the proposed control strategy illustrated its feasibility and correctness.

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“…For a digital implementation, the controller needs to be discretized. The resonant controller has highly selective characteristics and is seriously affected by the discretization method [30]. Thus, Tustin approximation with frequency pre-warping (23) was used to ensure the matching of the continuous and discrete time frequencies at the resonant frequency.…”

Section: Design Of the Hybrid Controller For The Three-phase Four-mentioning

confidence: 99%

Design of a Hybrid Controller for the Three-phase Four-leg Voltage-source Inverter with Unbalanced Load

Doan¹,

Kim²,

Choi³

et al. 2017

Journal of Power Electronics

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The three-phase four-leg voltage-source inverter topology is an interesting option for the three-phase four-wire system. With an additional leg, this topology can achieve superior performance under unbalanced and nonlinear load conditions. However, because of the low bandwidth of conventional controllers in high-power inverter applications, the system cannot guarantee a balanced output voltage under the unbalanced load condition. Most of the methods proposed to solve this problem mainly use the multiple synchronous frame method, which requires several controllers and a large amount of computation because of frame transformation. This study proposes a simple hybrid controller that combines proportional-integral (PI) and resonant controllers in the synchronous frame synchronized with the positive-sequence component of the output voltage of the three-phase four-leg inverter. The design procedure for the controller and the theoretical analysis are presented. The performance of the proposed method is verified by the experimental results and compared with that of the conventional PI controller.

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Effects of Discretization Methods on the Performance of Resonant Controllers

Cited by 549 publications

References 37 publications

Disturbance Calculation based on Space Vector Dot Product: Applications to Compensators

Disturbance Calculation based on Space Vector Dot Product: Applications to Compensators

A Proportional Resonant Control Strategy for Efficiency Improvement in Extended Range Electric Vehicles

Design of a Hybrid Controller for the Three-phase Four-leg Voltage-source Inverter with Unbalanced Load

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